Re: [time-nuts] Question about SA.33 Rb clock
Hi Tom and Magnus: Thanks for your reply and informations. I was wrong about all SA.3x things, I thought SA.3x was a traditional Rb87 optically pumped structure rather than CPT concept clock, because I noticed that SA series consums more power(5W at locked), not less power consumption(less 100mW) on the paper of CSAC. Another mistake I made was that I thought only Cs could be used in CSAC or MAC. Thanks for pointing that out, now I'm clear ith that. Regards. Hui Zhang On 2017-10-13 00:06 , Tom Van Baak Wrote: Hi Hui Zhang, > in the paper CSAC was described that it is based on CPT technology > My question is the SA.3x(or SA.2x) also used this method? Yes. Here's another good read; and it also includes photos of the inside of your SA.33: http://www-users.york.ac.uk/~jke1/Atomic_Clocks/Papers/Commercial%20CPT.pdf > In my impression the SA.3x series clock is called Rubidium clock, > and the SA.45 is a real Cesium CSAC? Your use of the phrase "real cesium" may be the source of your confus ion. The SA.3x uses rubidium and the SA.4x uses cesium. They are all real atoms. These modern MAC / CSAC atomic standards compete with high-end DOCXO quartz oscillators with respect to factors like temperature, stability, and drift. They do not compete with traditional laboratory rubidium or cesium standards. You may be thinking that because some CPT clocks use cesium instead of rubidium that they are special or more accurate, but this is not the case. None of these compact low-power laser / VCSEL / CPT -based frequency standards are primary standards. /tvb - Original Message - From: "Jar Sun via time-nuts" <time-nuts@febo.com> To: <time-nuts@febo.com> Sent: Saturday, October 07, 2017 8:27 PM Subject: [time-nuts] Question about SA.33 Rb clock Dear group: I have got a SA.33 Rb module from a second hand GPS clock, at first it works well, but soon after it was damaged that beacuse I was trying to install a heat sink on it, unfortunately I used screws which its size too long, so maybe the screws drilled into inside Rb lamp or inside circuit something? I don't know. I am not expecting this Rb can be receoveyed, I am just hope there is no some martirial hamfully leaked out. TVB gave me some information about this Rb module and a papers on this website: http://tycho.usno.navy.mil/ptti/2002papers/paper52.pdf I have read the paper for two times, but I am confused now, the paper described a principle of CSAC clock in 2002, in the papger CSAC was described that it is based on CPT technology, and the CPT is based on a VCSEL and a very small Cesium Cell and other implement necessarily. My question is the SA.3x(or SA.2x) also used this method? In my impression the SA.3x series clock is called Rubidium clock, and the SA.45 is a real Cesium CSAC? So if SA.3x or SA.2x used the technique which mentioned in paper52, can we say there is some Cesium material in SA.3x? I am totally confused, do anyone can give me some advice? Any information will be appreciated, Thanks a lot. Regards. Hui Zhang ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] A Symmtricom GPSDO Board
Dear group: Does anyone familiar with this Symmtricom GPSDO board? I have searched on internet but I have not found any manual or technical infomation about it. It seems can use a RS-232 cable and simple SCPI or serial command to control it, just like HP 58540 or other GPSDO board that I had, and there is a blank place on PCB that seems can install a big OCXO or SUB-Board? I don't sure, so I would like to find more detail of this board, it has a reasonable price so I can get one. Any information will be appreciated. Here is the some pictures. http://www.dz98.com/tp/an78-3.jpg http://www.dz98.com/tp/an78-1.jpg Regards. Hui Zhang /BA6IT ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] What is maximum digits that can SR620 display?
Dear Group: I have a SR620 Universal Time Interval Counter, I know it has a 16 digit LSD, my question is can these all 16 digit displayed in same time? I have tried feed it with 1Ghz frequency, or just feed 1Mhz frequency by pressing both the up and down arrow keys together toggles the x1000 expand frequency, I have also tried use 100s gate time to get more resolution, but all of these method doesn't work. So, can anyone tell me what is exactly maximum digits that can SR620 display? Regards. Hui Zhang /BA6IT ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] TBolt 10 MHz output ~1.7v rms / HP 8656B FG
Hello Max: I use a SMA Coax attenuator to connect my GPSDO/Rb Stand with the EXT Ref port of other equipment, the GPSDO/Rb often provides +7 ~ +13dBm output level, I believe it's too high for a EXT ref source, so I often use a 10dB attenuator to put it there, actually I like use another 10 ~ 20dB attenuator to series connect to input port, the advantage of these SMA attenuator is they are easy to connect in series, so can get any flexible attenuation value. By using these SMA attenuator, I need a additional SMA-BNC convert jack. That's my way, hope it's useful to you. Regards. Hui Zhang BA6IT At 2015-07-21 06:29:07, M. George m.matthew.geo...@gmail.com wrote: I picked up an HP 8656B from the usual place and have been cleaning it up... got around to testing the output which looks good on a cheap frequency counter etc... I'm wanting to use the 10 MHz output from my TBolt for the reference input on the HP 8656B and my Elecraft K3. So I started digging around in the manuals I can find on the internet, including KO4BB's cool manual stash. I'm not finding the specs on the input for the reference on the 8656B. I found an older reference for the 8646A that said to keep the input rms voltage between .2 and .4 volts, which scared me, because I had already hooked up the Tbolt direct. If this is correct, then .2 vrms - .4 vrms is around +2 dbm. The direct output on the TBolt to my scope is showing ~1.7 vrms which is close to +17 dbm. Yikes, I had that hooked up to the 8656B for a while... I hope I didn't screw anything up. I have a K3 with the EXREF board hooked up direct to the TBolt and it's happy as a clam with the 1.7 vrms input. Which is a tad bit high for the Elecraft docs which shows a nominal level of +4 dBm to +16 dBm. I'm assuming the 1.7 vrms is falling in to the 'nominal' range. I'm not finding dire warnings about hooking the TBolt 10 MHz output direct to a K3EXREF or an HP FG... I don't have a frequency counter that takes an external reference (yet), so it's hard to know if the HP 8656B is using the external reference. Again, I can't find much in the manuals to validate the external input, other than using a FC with the same reference input. Any input or tutoring would be helpful. Are others just adding resistance in line with the TBolt output to drop voltage? I tried a 50 ohm resistor and it dropped from 1.7 to just under 1v rms on the scope. Thanks Max NG7M -- M. George ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] A Open Source GPIB project
Hi: Here is a open source GPIB project that developed by some Chinese amateurs, the developer released all of the information about hardware and software, including circuit diagram, PCB diagram, firmware source code, communication protocol and upper computer PC program (late on). The project name is CARE.If you are interested you can build your own CARE, but please don’t use this open source project for commercial purpose. Specifications: WiFi expand interface （6 IOs + 3.3V power supply） Sensor expand interface (2 IOs + 3.3V power supply) j-link SWD mode interface TF Card slot RJ-45 connector (100Mbps) USB (via CP2102 connect to LPC1768, can be set to ARM inside USB connect by jumper) Mode Switch (Online or offline acquire) MCU: LPC1768 USB TO 232: CP2102 Network PHY: LAN8720A Temperature sensor: DS18B20, DHT22 and other model single bus sensor will be support at late version. GPIB interface chip: SN75160，SN75162 PCB size：60mm*100mm CARE firmware: https://git.oschina.net/gpib/CARE.git Upper Compter program: https://git.oschina.net/xknife/MonitorKnife.git (Under Construction) Circuit diagram and PCB: https://git.oschina.net/gpib/CARE-DXP.git BOM list: http://bbs.38hot.net/forum.php?mod=viewthreadtid=115514 BOM_GPIB.rar (will put file in GIT late) Protocol mode: 1, Transport protocol transfer mode, the GPIB address of equipment can be user define of LAN USB and WIFI port 2, The developers defined GPIB protocol, support multi-address and multi-equipment, the protocol file is (so far, only Chinese language version) http://bbs.38hot.net/forum.php?mod=viewthreadtid=115514 Care通讯协议说明-b1.v150410.2.rar Testing tool” 1, Some Serial port tools like as sscom 3.2; send HEX or ASCII command to CARE via serial port; 2,TPCUDP testing tools, send control or SCPI command to CARE via Ethernet port; 3,ASCII code converting tool The project is not over, so far, the hardware part is OK, but the code of offline acquire and Talk Only function is not finish. (coming soon….), some various equipments were tested by SCPI or old HP GPIB command, they work very well. The Care Project Post in Chinese 38hot forum, many pics: http://bbs.38hot.net/forum.php?mod=viewthreadtid=115514 This open source project can't be used for commercial purpose. The main developer’s email: guangz...@163.com Have a fun! Hui Zhang /BA6IT ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] A Open Source GPIB project
Hello Bob: To generate program file, you need the KEIL develop environment, or you can just using HEX file to program MCU directly, the HEX file will put on the GIT website late time when all software function finished. If anyone interested in HEX file of current version (not including off-line acqurie and Talk Only function), send off-line email to me, I will send you a copy. The other url of original email contain the schematic and PCB files, you need Protel DXP files to open it, the PDF format schematic file and a guide document will be published late, maybe few weeks. The document will be Chinese language, but If people need, I think I can translate a short English version (if you guys don't hate my bad English). And I will collect some questions and forward them to developers. But you know, it's a Open Source project, all developer uses their spare time to do these job, so the question maybe can't be reply quickly or 100% responsed. Anyway, this project is still in progress, if any important news happened, I will let you people know. Best regards. Hui Zhang /BA6IT At 2015-04-26 21:42:00, Bob Camp kb...@n1k.org wrote: Hi After poking around a bit, more questions that comments. 1) It looks pretty cool. 2) Any idea of what the tool chain was that generated the files? (I probably need viewing programs that I don’t have) 3) Do they have any plans to bring up the doc’s in English? (even if only through a translation program) Once they get the stuff running, I suspect there will be a lot of questions about interfacing it to things like TimeLab. Bob On Apr 25, 2015, at 11:42 PM, Hui Zhang ba...@163.com wrote: Hi: Here is a open source GPIB project that developed by some Chinese amateurs, the developer released all of the information about hardware and software, including circuit diagram, PCB diagram, firmware source code, communication protocol and upper computer PC program (late on). The project name is CARE.If you are interested you can build your own CARE, but please don’t use this open source project for commercial purpose. Specifications: WiFi expand interface （6 IOs + 3.3V power supply） Sensor expand interface (2 IOs + 3.3V power supply) j-link SWD mode interface TF Card slot RJ-45 connector (100Mbps) USB (via CP2102 connect to LPC1768, can be set to ARM inside USB connect by jumper) Mode Switch (Online or offline acquire) MCU: LPC1768 USB TO 232: CP2102 Network PHY: LAN8720A Temperature sensor: DS18B20, DHT22 and other model single bus sensor will be support at late version. GPIB interface chip: SN75160，SN75162 PCB size：60mm*100mm CARE firmware: https://git.oschina.net/gpib/CARE.git Upper Compter program: https://git.oschina.net/xknife/MonitorKnife.git (Under Construction) Circuit diagram and PCB: https://git.oschina.net/gpib/CARE-DXP.git BOM list: http://bbs.38hot.net/forum.php?mod=viewthreadtid=115514 BOM_GPIB.rar (will put file in GIT late) Protocol mode: 1, Transport protocol transfer mode, the GPIB address of equipment can be user define of LAN USB and WIFI port 2, The developers defined GPIB protocol, support multi-address and multi-equipment, the protocol file is (so far, only Chinese language version) http://bbs.38hot.net/forum.php?mod=viewthreadtid=115514 Care通讯协议说明-b1.v150410.2.rar Testing tool” 1, Some Serial port tools like as sscom 3.2; send HEX or ASCII command to CARE via serial port; 2,TPCUDP testing tools, send control or SCPI command to CARE via Ethernet port; 3,ASCII code converting tool The project is not over, so far, the hardware part is OK, but the code of offline acquire and Talk Only function is not finish. (coming soon….), some various equipments were tested by SCPI or old HP GPIB command, they work very well. The Care Project Post in Chinese 38hot forum, many pics: http://bbs.38hot.net/forum.php?mod=viewthreadtid=115514 This open source project can't be used for commercial purpose. The main developer’s email: guangz...@163.com Have a fun! Hui Zhang /BA6IT ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Once again about counter calibration
Hi: I also have a HP5386, it has very limited inside space, I think the MV89 is too big to it, even MV89 is small size in familiar OCXO, so if I need mor accurate, I used a extend GPSDO for its 10M stand. Hui Zhang BA6IT Sent from my Moto X 已通过我的 Moto X 发送 2015年4月25日 上午11:46于 d0ct0r t...@patoka.org写道： Following my request, I am curious about modding of HP 5386A. My unit has TCXO. Is it possible to replace that existed TCXO by third part OCXO ? Like Morion MV89A, for example ? -- WBW, V.P. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] SR620 - any gotchas buying a used one?
The SR620's manual is perfect, there is a whole chapter has detail information of performance test. You can use that way for check the counter's condition. Hui Zhang At 2014-11-22 07:51:41, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: After regrettably selling my 5370B a few years ago, I decided to look for a used SR620. Are there any particular issues with these that could be tested by the seller prior to shipping it? I have not downloaded the manual yet, but I assume there's a basic test in there - probably similar to that in the 5370B manual. Were these available with a Rb oscillator? I see a seller on eBay that he has some Rb ones for $1500 extra, but I don't see it as an option on the SRS web site. Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP 5342A (18 GHz) vs 5352B (40 GHz) frequency counters
The manual stated HP5342A have a option 001, it's a HP10544 OCXO with PC card connector(A24), but when I opened my HP5342A, there is very limited space, I doubt it's whether can contain a big 10544 OCXO in there. So I always use a external 10MHz to feed my counter. Hui Zhang At 2014-11-22 05:51:16, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: I am looking for a microwave frequency counter and won an auction for an 18 GHz 5342A with the GPIB option today @ £200 (GBP). I have just paid for that. I also have the chance to get a 5352B 40 GHz counter for £500. That has GPIB as standard. In the short/medium term I don't see much use for a 40 GHz counter, but I am giving consideration to buying the 40 GHz and selling the 18 GHz one. I would be interested to know if anyone has any opinions on the relative merrits of the two counters. Neither of these counters have ovens, but stability is not a major issue given they take a 10 MHz input. That said, foes anyone know if these take fairly common 10811A ovens? There is a chance I would use it in places where it would not practical to feed in 10 MHz. Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] SR620 - any gotchas buying a used one?
Hi Bob: I agree with you. But the chapter is a easy way to check your new counter when it arrived, and it's not only a calibration of just self test, it's testing counter's performance on some level. Regards. Hui Zhang At 2014-11-22 10:22:53, Bob Camp kb...@n1k.org wrote: Hi Probably the best information out there on setting up a SR620 is buried in the archives of this list back a few years. The back and forth required on some of the adjustments is far from obvious. You do need to start from the manual and get it as far as the manual will allow. You then go into the “Time Nuts advanced” procedures. Bob On Nov 21, 2014, at 9:19 PM, Hui Zhang ba...@163.com wrote: The SR620's manual is perfect, there is a whole chapter has detail information of performance test. You can use that way for check the counter's condition. Hui Zhang At 2014-11-22 07:51:41, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: After regrettably selling my 5370B a few years ago, I decided to look for a used SR620. Are there any particular issues with these that could be tested by the seller prior to shipping it? I have not downloaded the manual yet, but I assume there's a basic test in there - probably similar to that in the 5370B manual. Were these available with a Rb oscillator? I see a seller on eBay that he has some Rb ones for $1500 extra, but I don't see it as an option on the SRS web site. Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP 8568B
Hello: I am afraid I made a dumb mistake, I ignored a calibration procedure in the page 3 of manual, it's too front in the book so I missed it, I am very sorry. The procedure is: 1, Connect CAL OUTPUT to SIGNAL INPUT 2. 2,Press [INSTR PRESET], [RECALL], [9] on the analyzer. 3,Adjust FREQ ZERO for a maximum amplitude trace. 4,Press [INSTR PRESET]. By follow these step, I adjust the curve peak in the center of horizontal axis, and then I use my 10MHz REF and test other 10MHz source, the normal marker read is 10.01Mhz - only 1Hz error. It's very good result. I think it a basic calibration procedure, but I never did it before, it's my dumb mistake. Before I do these adjustment, I almost ready to pull down the 10811 OCXO to make some separate calibration and test work. But it seems unnecessary if I only use EXT REF. But I still decide do some calibration work of that 18011 OCXO at late times. At last I'd say many thanks for this group, and every kindly people who trying to help me, thank you! Hui Zhang At 2014-06-29 10:30:20, John Miles j...@miles.io wrote: Are you using the normal marker or the frequency counter marker? The counter marker should be accurate, while the frequency displayed for the normal marker position will not be. You may be able to improve the normal marker's accuracy in narrow spans if you run the shift-W self-calibration routine but it will never be as good as the counter. -- john, KE5FX -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Hui Zhang Sent: Saturday, June 28, 2014 6:49 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] HP 8568B Hello all: Rencently I bought a second-hand HP8568B Spectrum Analyzer, it kind of vintage but works well. Only problem is its time base lost accurate. When I use it measured my HP Z3801A output (locked to GPS), the center frequency read is 9.12MHz, about 88Hz diffrence. So I decide to use my Z3801A for its external reference. When I connected the cable and set the reference switch in rear paneal to EXT, the CRT displayed EXT REF, I believed it worked. But when I use it measure a nother GPSDO (Trimble ThunderBolt locked to GPS), it still have 42Hz diffrence. I am very sure both of my two GPSDO is good, if I use my HP53132A counter to compare them they will has less 1E-10 (1mHz) diffrence. And then I tie a BNC three-way connect from my Z3801A, one way to 8568B's EXT stand input, one way to the signal input in front panel, the diffrence is still 42Hz - it's 10.42MHz. I was fully confused, do I need a calibration after I used external 10Mhz stand? I read the manual again but not fou nd any infomation about how to do it. What do I do now? Anyone give me a suggestion? Any infomation will be appreciate. Hui Zhang ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time- nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] HP 8568B
Hello all: Rencently I bought a second-hand HP8568B Spectrum Analyzer, it kind of vintage but works well. Only problem is its time base lost accurate. When I use it measured my HP Z3801A output (locked to GPS), the center frequency read is 9.12MHz, about 88Hz diffrence. So I decide to use my Z3801A for its external reference. When I connected the cable and set the reference switch in rear paneal to EXT, the CRT displayed EXT REF, I believed it worked. But when I use it measure a nother GPSDO (Trimble ThunderBolt locked to GPS), it still have 42Hz diffrence. I am very sure both of my two GPSDO is good, if I use my HP53132A counter to compare them they will has less 1E-10 (1mHz) diffrence. And then I tie a BNC three-way connect from my Z3801A, one way to 8568B's EXT stand input, one way to the signal input in front panel, the diffrence is still 42Hz - it's 10.42MHz. I was fully confused, do I need a calibration after I used external 10Mhz stand? I read the manual again but not fou nd any infomation about how to do it. What do I do now? Anyone give me a suggestion? Any infomation will be appreciate. Hui Zhang ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP 8568B
Hi Tommy: I used each span to do my test, they are also have frequency diffrence, the 42Hz is result of 1kHz span. I also use marker counter function, sometime I use 'peak serach' function, it will gave me a peak value, very helpful. I am thinking about the reason you and Alex talked about 'internal LO's are locked to the 10 MHz reference', I thought the internal OCXO will not join work if a EXT REF in, am I wrong? Thanks you! Hui Zhang At 2014-06-29 10:24:22, Tommy phone thol...@woh.rr.com wrote: Hi Hui... The first thought is that you are tied to the resolution of the span divided by the number of displayed points -1. Try a narrower span. If you look at the absolute accuracy spec that error may be within the '66's capability. Also, I believe there is a marker counter function that will give you a more accurate reading. Another consideration is that not all of the internal LO's are locked to the 10 MHz reference. Don't panic yet :) From Tom Holmes On Jun 28, 2014, at 9:48 PM, Hui Zhang ba...@163.com wrote: Hello all: Rencently I bought a second-hand HP8568B Spectrum Analyzer, it kind of vintage but works well. Only problem is its time base lost accurate. When I use it measured my HP Z3801A output (locked to GPS), the center frequency read is 9.12MHz, about 88Hz diffrence. So I decide to use my Z3801A for its external reference. When I connected the cable and set the reference switch in rear paneal to EXT, the CRT displayed EXT REF, I believed it worked. But when I use it measure a nother GPSDO (Trimble ThunderBolt locked to GPS), it still have 42Hz diffrence. I am very sure both of my two GPSDO is good, if I use my HP53132A counter to compare them they will has less 1E-10 (1mHz) diffrence. And then I tie a BNC three-way connect from my Z3801A, one way to 8568B's EXT stand input, one way to the signal input in front panel, the diffrence is still 42Hz - it's 10.42MHz. I was fully confused, do I need a calibration after I used external 10Mhz stand? I read the manual again but not f o u nd any infomation about how to do it. What do I do now? Anyone give me a suggestion? Any infomation will be appreciate. Hui Zhang ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] How to turn off ECHO of Z38xx series GPSDO
Dear group: I'm building a little Arduino project that is HP Z38xx's LCD monitor, I use a Arduino Duemilanove board and a 12864 LCD screen to display running infomation of Z38xx, but when I almost finish my program, I found my Z3801A changed serial port output mode, it send a command echo before useful message, like as: if I sent ROSC:STAT? At first it will return LOCK CR/LF SCPI, I used few code to cut sub-string before CR/LF, it works well; But now it return ROSC:STAT? 0x0D 0x0A LOCK 0x0D 0x0A SCPI, it added a ECHO message (same with which command the Arduiono sent to it) in ASCII message head. I used a PC and Hyper Terminal to monitor my Z3801A, it gave me same output. I didn't recall how it change its output mode, but point is how to turn off this ECHO mode? Thanks a lot. Hui Zhang ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] How to turn off ECHO of Z38xx series GPSDO
well, by send SYST:COMM:SER1:FDUP 0 to my Z3801A, I fix this problem. Hui Zhang At 2013-09-08 17:54:02,Hui Zhang ba...@163.com wrote: Dear group: I'm building a little Arduino project that is HP Z38xx's LCD monitor, I use a Arduino Duemilanove board and a 12864 LCD screen to display running infomation of Z38xx, but when I almost finish my program, I found my Z3801A changed serial port output mode, it send a command echo before useful message, like as: if I sent ROSC:STAT? At first it will return LOCK CR/LF SCPI, I used few code to cut sub-string before CR/LF, it works well; But now it return ROSC:STAT? 0x0D 0x0A LOCK 0x0D 0x0A SCPI, it added a ECHO message (same with which command the Arduiono sent to it) in ASCII message head. I used a PC and Hyper Terminal to monitor my Z3801A, it gave me same output. I didn't recall how it change its output mode, but point is how to turn off this ECHO mode? Thanks a lot. Hui Zhang ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] HP53132A's LSD question
Dear group: I found a strange thing about HP53132A’s output digit, I know the HP53132A is a universal counter that have 12 digits per second performance by read the manual. By use 10s gate time, I thought it will be 13 digits resolution. But I found it can output more digits reads by use GPIB or RS-232 way to collect datas. (This is simple way rather than use offset method). I use RS-232 cable to connected to my counter to observe the frequency of a OCXO, I got these output result ( a part of long sequence): 9.999,967,286,098,0 MHz 9.999,981,814,726,9 MHz 9.999,991,573,702,0 MHz 9.999,997,482,253,0 MHz 9.999,999,945,685 MHz 10.000,000,472,030,4 MHz 10.000,000,460,991,3 MHz 10.000,000,352,570,9 MHz 10.000,000,254,108 MHz 10.000,000,183,759 MHz 10.000,000,136,842 MHz .. . (Omitted few lines) . 10.000,000,039,724 MHz 10.000,000,006,299 MHz 9.999,999,992,692 MHz 9.999,999,990,674 MHz 9.999,999,989,094 MHz 9.999,999,995,662 MHz 9.999,999,993,829 MHz The question is in first four lines the reads is 14 digits, but in line 5, the digits reduce to 13 digits, and then, it’s became 15 digits in line 6(because over 10Mhz). After 3 lines, the reads reduce one digits again to became 14 digits(also over 10Mhz), again after that few lines the frequency less that 10Mhz, it return to 13 digits like last few line. My question is what determines the HP53132A’s resolution? Why the output is variable digits even the had very close frequency? Any comment will be appreciate. Hui Zhang ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP53132A's LSD question
Hello Bob: That's good idea, I will try it at right time, in fact I collect about 300 data by measured a OCXO warm-up, and I made a excel chart to analize the relative of output digit and frequency. but it's very crudely because I use little time to do it. I don't have a high resolution DAC, I will find a way to do this test late. Thank you. Here is a screen shot of my chart: http://hkbbs.leowood.net:88/incomefiles/20139/18581578616.JPG Hui Zhang At 2013-09-01 07:51:24,Bob Camp li...@rtty.us wrote: Hi One thing to look at - Take a large set of data and then sort it by reading. What you will find is that there are only certain numbers that come up. You can directly observe this with a good OCXO and a high resolution input to the EFC. Bob On Aug 31, 2013, at 11:06 AM, Hui Zhang ba...@163.com wrote: Dear group: I found a strange thing about HP53132A’s output digit, I know the HP53132A is a universal counter that have 12 digits per second performance by read the manual. By use 10s gate time, I thought it will be 13 digits resolution. But I found it can output more digits reads by use GPIB or RS-232 way to collect datas. (This is simple way rather than use offset method). I use RS-232 cable to connected to my counter to observe the frequency of a OCXO, I got these output result ( a part of long sequence): 9.999,967,286,098,0 MHz 9.999,981,814,726,9 MHz 9.999,991,573,702,0 MHz 9.999,997,482,253,0 MHz 9.999,999,945,685 MHz 10.000,000,472,030,4 MHz 10.000,000,460,991,3 MHz 10.000,000,352,570,9 MHz 10.000,000,254,108 MHz 10.000,000,183,759 MHz 10.000,000,136,842 MHz .. . (Omitted few lines) . 10.000,000,039,724 MHz 10.000,000,006,299 MHz 9.999,999,992,692 MHz 9.999,999,990,674 MHz 9.999,999,989,094 MHz 9.999,999,995,662 MHz 9.999,999,993,829 MHz The question is in first four lines the reads is 14 digits, but in line 5, the digits reduce to 13 digits, and then, it’s became 15 digits in line 6(because over 10Mhz). After 3 lines, the reads reduce one digits again to became 14 digits(also over 10Mhz), again after that few lines the frequency less that 10Mhz, it return to 13 digits like last few line. My question is what determines the HP53132A’s resolution? Why the output is variable digits even the had very close frequency? Any comment will be appreciate. Hui Zhang ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP53132A's LSD question
Hello: Thanks TVB and Magnus's comment, I think I should ignore that last digit value, it's useless in result. Yes the oscillator in my test is very poor, beacuse it's a OCXO warm-up procedure, the counter's output digit was not regular, I don't know when it add or reduce the digit, but I found in a stablility frequency very close 10Mhz, it not happened. So I powered on a OCXO and observe the output digit in a large range of frequency change. Hui Zhang At 2013-09-01 01:49:49,Tom Van Baak t...@leapsecond.com wrote: Hi Hui Zhang, Yes, I agree it looks strange, but this is normal and correct for the 53132; or modern frequency counters like it. When it drops a decimal place on the right it is doing you a favor because that last digit is known to be noise rather than a real digit of measurement. HP/Agilent has always been concerned with accuracy and truth. In frequency mode, these counters use oversampling algorithms to report the *best fit* frequency. It works well until the frequency gets very, very close an exact fractional/multiple of 10 MHz. Then the algorithms no longer improve phase resolution and the instrument becomes more like a conventional 10 or 11 digit/second frequency counter. The output is still accurate, but the precision is reduced accordingly. Again, this is normal. If you've ever designed a high-resolution frequency counter you understand why. Amazingly (and to their credit), the 53132 counter firmware detects this sub-standard condition and removes digits from the output. It does this because those digits are recognized to be meaningless. You will also notice in statistics mode it replaces low order digit(s) with a '*' character. Some engineer at HP did a lot of work to make sure the instrument did not report more resolution than was valid. There is a footnote in the 53131/53132 manual that explains this: http://leapsecond.com/pages/53132/53132-reduced-resolution.gif In your case, your oscillator is quite poor. Your oscillator varies by hundreds of microHertz each measurement. The ADEV is about 1e-10. In this case, it is not a counter problem; it is instability in your oscillator (or reference). The good news is that for this type of oscillator, your 53132 counter performs well and you do not need a more expensive time/frequency comparison instrument. If you need more information, let me know. /tvb - Original Message - From: Hui Zhang ba...@163.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Saturday, August 31, 2013 8:06 AM Subject: [time-nuts] HP53132A's LSD question Dear group: I found a strange thing about HP53132A’s output digit, I know the HP53132A is a universal counter that have 12 digits per second performance by read the manual. By use 10s gate time, I thought it will be 13 digits resolution. But I found it can output more digits reads by use GPIB or RS-232 way to collect datas. (This is simple way rather than use offset method). I use RS-232 cable to connected to my counter to observe the frequency of a OCXO, I got these output result ( a part of long sequence): 9.999,967,286,098,0 MHz 9.999,981,814,726,9 MHz 9.999,991,573,702,0 MHz 9.999,997,482,253,0 MHz 9.999,999,945,685 MHz 10.000,000,472,030,4 MHz 10.000,000,460,991,3 MHz 10.000,000,352,570,9 MHz 10.000,000,254,108 MHz 10.000,000,183,759 MHz 10.000,000,136,842 MHz .. . (Omitted few lines) . 10.000,000,039,724 MHz 10.000,000,006,299 MHz 9.999,999,992,692 MHz 9.999,999,990,674 MHz 9.999,999,989,094 MHz 9.999,999,995,662 MHz 9.999,999,993,829 MHz The question is in first four lines the reads is 14 digits, but in line 5, the digits reduce to 13 digits, and then, it’s became 15 digits in line 6(because over 10Mhz). After 3 lines, the reads reduce one digits again to became 14 digits(also over 10Mhz), again after that few lines the frequency less that 10Mhz, it return to 13 digits like last few line. My question is what determines the HP53132A’s resolution? Why the output is variable digits even the had very close frequency? Any comment will be appreciate. Hui Zhang ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP53132A's LSD question
Sorry the screen shot's url is: http://hkbbs.leowood.net:88/incomefiles/20139/19144671911.JPG At 2013-09-01 09:05:56,Hui Zhang ba...@163.com wrote: Hello Bob: That's good idea, I will try it at right time, in fact I collect about 300 data by measured a OCXO warm-up, and I made a excel chart to analize the relative of output digit and frequency. but it's very crudely because I use little time to do it. I don't have a high resolution DAC, I will find a way to do this test late. Thank you. Here is a screen shot of my chart: http://hkbbs.leowood.net:88/incomefiles/20139/18581578616.JPG Hui Zhang At 2013-09-01 07:51:24,Bob Camp li...@rtty.us wrote: Hi One thing to look at - Take a large set of data and then sort it by reading. What you will find is that there are only certain numbers that come up. You can directly observe this with a good OCXO and a high resolution input to the EFC. Bob On Aug 31, 2013, at 11:06 AM, Hui Zhang ba...@163.com wrote: Dear group: I found a strange thing about HP53132A’s output digit, I know the HP53132A is a universal counter that have 12 digits per second performance by read the manual. By use 10s gate time, I thought it will be 13 digits resolution. But I found it can output more digits reads by use GPIB or RS-232 way to collect datas. (This is simple way rather than use offset method). I use RS-232 cable to connected to my counter to observe the frequency of a OCXO, I got these output result ( a part of long sequence): 9.999,967,286,098,0 MHz 9.999,981,814,726,9 MHz 9.999,991,573,702,0 MHz 9.999,997,482,253,0 MHz 9.999,999,945,685 MHz 10.000,000,472,030,4 MHz 10.000,000,460,991,3 MHz 10.000,000,352,570,9 MHz 10.000,000,254,108 MHz 10.000,000,183,759 MHz 10.000,000,136,842 MHz .. . (Omitted few lines) . 10.000,000,039,724 MHz 10.000,000,006,299 MHz 9.999,999,992,692 MHz 9.999,999,990,674 MHz 9.999,999,989,094 MHz 9.999,999,995,662 MHz 9.999,999,993,829 MHz The question is in first four lines the reads is 14 digits, but in line 5, the digits reduce to 13 digits, and then, it’s became 15 digits in line 6(because over 10Mhz). After 3 lines, the reads reduce one digits again to became 14 digits(also over 10Mhz), again after that few lines the frequency less that 10Mhz, it return to 13 digits like last few line. My question is what determines the HP53132A’s resolution? Why the output is variable digits even the had very close frequency? Any comment will be appreciate. Hui Zhang ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3815 question
Hello Azelio: Thanks for your reply, about Z3815A auto survey, I found a command can fix it, it's: :GPS:POS:SURV:STAT:POW 0 I don't know this command before, the Z3801 manual not include it (I haven't Z3815 manual, but they are kind of similar). When I used SatStat software, I found this command, it does worked. About strange years, my friend told me it's a Furuno GPS's bug, he gave me two url to explain it: http://www.furuno.com.cy/important-notice.html http://www.vk2hmc.net/blog/?p=727#comment-334 I will review the old discussion that you talk about. I still not understand how HP define absolute EFC and relative EFC value, I will figure it out. Best regards. Hui Zhang At 2013-08-28 18:14:53,Azelio Boriani azelio.bori...@screen.it wrote: The Z3815 doesn't store the surveyed location so at every power on it has to survey again. It is supposed you leave it on forever once installed. Strange date: the date reflects the fact that the Furuno GPSes have a 1024 weeks rollover correction that was designed in 1993 and past 19 years it reverts back. This bug was discussed here 2 weeks ago. On Wed, Aug 28, 2013 at 3:30 AM, Hui Zhang ba...@163.com wrote: Sorry I forgot a qeustion about EFC, last night when I power on my Z3815A, it had a alarm message is EFC limit, I use follow command to watch EFC value: Sent: :DIAG:ROSC:EFC:ABS? reply: +489118 Sent: :DIAG:ROSC:EFC:rel? reply: -6.70809E+000 And then, I reboot the device, the alarm disappeared, the EFC value is: Sent: :DIAG:ROSC:EFC:rel? reply: +5.78499E-001 Sent: :DIAG:ROSC:EFC:ABS? reply: +494788 So, I want know what is normal EFC range of Z3815A? Hui At 2013-08-28 09:03:40,Hui Zhang ba...@163.com wrote: Dear All: I just got a Z3815A GPSDOS, now it working well, but I have few questions: 1, Why my Z3815A will do survey everytime at power on? Even its finished survey 100%. 2, Why its date is 1994 Jun 11? But time is correct. 3, What's type of antenna connector in back panel? Thanks! Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3815 question
Hello Azelio: I browsed that webpage of TVB, I know Z3801A's EFC is 20bit, that is 2^20=1048576, I also review old archive of our mail-list, I saw Bob rbenward said his Z3801' EFC ramped up to the 1048560 so he got a EFC error. My 3801's EFC absolutely value now is +494788, about half value of full EFC range, it's not bad. I don't worry about my HP E-1938 Oscillator become to fail. I am looking for a new version Furuno GPS board or HP58534 (use GT-77 module) to replace my z3815 by acceptable price. But for now, even I don't replace it, my GPSDO also works well except data error. Thanks for your infomation. Hui Zhang At 2013-08-28 22:31:11,Azelio Boriani azelio.bori...@screen.it wrote: You can take a look here http://leapsecond.com/pages/z3801a-efc/ for some insight about the EFC of the Z3801A that should be the same as the Z3815A. I think that the Furuno's problem with the 1024 week rollover is not properly a bug. I should say that the problem is with GPS designers that used only 10 bits to encode weeks. Anyway, it should be very interesting if the firmware of the GPS is readable, then the code can be patched to permanently add 1024 to the week number. Until now I have not found any reference about Furuno's firmware upload/dowload. On Wed, Aug 28, 2013 at 3:26 PM, Hui Zhang ba...@163.com wrote: Hello Azelio: Thanks for your reply, about Z3815A auto survey, I found a command can fix it, it's: :GPS:POS:SURV:STAT:POW 0 I don't know this command before, the Z3801 manual not include it (I haven't Z3815 manual, but they are kind of similar). When I used SatStat software, I found this command, it does worked. About strange years, my friend told me it's a Furuno GPS's bug, he gave me two url to explain it: http://www.furuno.com.cy/important-notice.html http://www.vk2hmc.net/blog/?p=727#comment-334 I will review the old discussion that you talk about. I still not understand how HP define absolute EFC and relative EFC value, I will figure it out. Best regards. Hui Zhang At 2013-08-28 18:14:53,Azelio Boriani azelio.bori...@screen.it wrote: The Z3815 doesn't store the surveyed location so at every power on it has to survey again. It is supposed you leave it on forever once installed. Strange date: the date reflects the fact that the Furuno GPSes have a 1024 weeks rollover correction that was designed in 1993 and past 19 years it reverts back. This bug was discussed here 2 weeks ago. On Wed, Aug 28, 2013 at 3:30 AM, Hui Zhang ba...@163.com wrote: Sorry I forgot a qeustion about EFC, last night when I power on my Z3815A, it had a alarm message is EFC limit, I use follow command to watch EFC value: Sent: :DIAG:ROSC:EFC:ABS? reply: +489118 Sent: :DIAG:ROSC:EFC:rel? reply: -6.70809E+000 And then, I reboot the device, the alarm disappeared, the EFC value is: Sent: :DIAG:ROSC:EFC:rel? reply: +5.78499E-001 Sent: :DIAG:ROSC:EFC:ABS? reply: +494788 So, I want know what is normal EFC range of Z3815A? Hui At 2013-08-28 09:03:40,Hui Zhang ba...@163.com wrote: Dear All: I just got a Z3815A GPSDOS, now it working well, but I have few questions: 1, Why my Z3815A will do survey everytime at power on? Even its finished survey 100%. 2, Why its date is 1994 Jun 11? But time is correct. 3, What's type of antenna connector in back panel? Thanks! Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Z3815 question
Dear All: I just got a Z3815A GPSDOS, now it working well, but I have few questions: 1, Why my Z3815A will do survey everytime at power on? Even its finished survey 100%. 2, Why its date is 1994 Jun 11? But time is correct. 3, What's type of antenna connector in back panel? Thanks! Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3815 question
Sorry I forgot a qeustion about EFC, last night when I power on my Z3815A, it had a alarm message is EFC limit, I use follow command to watch EFC value: Sent: :DIAG:ROSC:EFC:ABS? reply: +489118 Sent: :DIAG:ROSC:EFC:rel? reply: -6.70809E+000 And then, I reboot the device, the alarm disappeared, the EFC value is: Sent: :DIAG:ROSC:EFC:rel? reply: +5.78499E-001 Sent: :DIAG:ROSC:EFC:ABS? reply: +494788 So, I want know what is normal EFC range of Z3815A? Hui At 2013-08-28 09:03:40,Hui Zhang ba...@163.com wrote: Dear All: I just got a Z3815A GPSDOS, now it working well, but I have few questions: 1, Why my Z3815A will do survey everytime at power on? Even its finished survey 100%. 2, Why its date is 1994 Jun 11? But time is correct. 3, What's type of antenna connector in back panel? Thanks! Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] motorola GPS antenna connector
Yes, it's MCX connector, I replaced one on my VP oncore board. Hui At 2013-08-06 18:19:53,Mark C. Stephens ma...@non-stop.com.au wrote: Can't seem to find anything in Aussie that is Called OSX connector. Could they be called MCX connector? We got some of those ): --marki -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com Sent: Tuesday, 6 August 2013 7:43 PM To: time-nuts@febo.com Subject: Re: [time-nuts] motorola GPS antenna connector My records show the B1121P1114 as a 6 channel Oncore VP, which means it should be the same receiver as used in the Z3801A although I haven't looked to check that. The standard connector on these was what's known as an OSX Regards Nigel GM8PZR In a message dated 06/08/2013 10:25:27 GMT Daylight Time, ma...@non-stop.com.au writes: Can someone put a finger on the name (type) of the antenna connector on the Motorola GPS units in the HP Z3805, please? :DIAG:IDEN:GPS? COPYRIGHT 1991-1995 MOTOROLA INC.,SFTW P/N # 98-P39972M ,SOFTWARE VER # 8 ,SOFTWARE REV # 4 ,SOFTWARE DATE 13 JUL 1995,MODEL #B1121P1114 ,HDWR P/N # _ ,SERIAL # SSG0134726 ,MANUFACTUR DATE 6C08 ,OPTIONS LISTIB E-230 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Specifications of the older PicoSync GPS Engine communication protocol on the RS232 port?
Hello Juhua: I also have a similar GPSDO, it troubled me long times, beacuse I made a mistake of its model, I thought it's PICOSYNC II. So I use FEI's PicoSyncView program trying to connect it, but got no any response. I think maybe FEI have a old version PicoSyncView program for this GPSDO, you may try to write a email to their tech-support: techsupp...@fei-zyfer.com. If you have any progress, please let's me know. Thanks! Hui At 2013-07-19 18:13:41,Juha Honkanen juha.honka...@swipnet.se wrote: Hi all I have a couple of the older PicoSync GPS Engines: http://www.trinstruments.cz/data/files/picosync-gps-engine-604.pdf They are working fine and producing good stable freq ref for my instruments. Please note that these are the first version and not the newer one PicoSync II. Is there any one here on the time-nuts list that has been able to reverse engineer the binary protocol that the PicoSync seems to be using on the RS232 port? It seems to be some proprietary protocol by FEI Inc (Frequency Electronics Inc) that I have not seen before. I see that the internal GPS receiver being used by PicoSync is a standard Trimble Resolution T (http://www.trimble.com/timing/resolution-t.aspx ) and when I connect to the GPS card directly I am able to communicate with the card via Trimble software and the TSIP protocol using 9600-O-8-1 comm parameters. I used the pretty good Trimble GPS Studio software (http://trl.trimble.com/dscgi/ds.py/Get/File-484972/TrimbleStudio.exe) However, when I connect via the RS232 port on the PicoSync I receive something that looks like a binary proprietary protocol that is not TSIP. I have been able to verify that the PicoSync also switches from from 9600-O-8-1 comm parameters from the internal Trimble Resolution T card to use 9600-N-8-1 on the RS232 output. I have used both oscilloscope connected directly to the Resolution T card via an TTL to RS232 converter as well as to the RS232 output and the signals looks ok with proper levels. It definitely looks like PicoSync is massaging the data in some way. This is how some of the HEX TSIP protocol data looks like coming out from the Trimble Resolution T card: Some of the Packet from the GPS receiver Trimble Resolution 10 8F AB 00 06 5C 93 06 D5 00 10 00 23 30 13 12 07 07 DD 10 03 10 6D 9C 3F F4 1C 23 3F 76 BF 16 3F D2 A3 88 3F 81 26 B2 1B 13 06 01 03 12 16 1C 0E 10 03 10 5C 1B 00 01 01 40 D9 99 9A 48 CB 92 66 3F 51 45 76 40 3E 6E D8 00 00 00 01 10 03 10 5C 13 08 01 01 40 A6 66 66 48 CB 92 66 3F 9A 88 DD 40 77 0A 03 00 00 00 01 10 03 So that above looks like familiar TSIP packets with 0x10 as the starting byte and 0x10 and 0x03 as the ending bytes. At the same time the PicoSync outputs following packets on the RS232 output: 02 04 00 00 00 42 6C B4 87 41 90 F6 5D 00 53 09 07 BC 3F 13 08 70 10 00 09 07 02 0D 06 05 01 00 FA 00 00 00 00 00 00 00 00 31 02 04 00 00 00 42 6C B4 8A 41 90 F6 6B 00 50 09 07 BC 3F 13 09 E2 10 00 09 07 02 0D 06 05 01 00 FA 00 00 00 00 00 00 00 00 B2 02 04 00 00 00 42 6C B4 8A 41 90 F6 6A 00 50 08 07 BC 3F 13 09 EE 10 00 09 07 02 0D 06 05 01 00 FA 00 00 00 00 00 00 00 00 BC 02 04 00 00 00 42 6C B4 89 41 90 F6 69 00 51 09 07 BC 3F 13 0A 02 10 00 09 07 02 0D 06 05 01 00 FA 00 00 00 00 00 00 00 00 D1 02 04 00 00 00 42 6C B4 89 41 90 F6 69 00 51 09 07 BC 3F 13 0A 04 10 00 09 07 02 0D 06 05 01 00 FA 00 00 00 00 00 00 00 00 D3 Note that quite many initial bytes looks exactly similar between the transmissions and that the ending packets are also long and identical between the transmissions except for the final byte that seems to be some kind of counter counting up 0x02 on each transmission? I am pretty stuck now with trying to figure this out since I guess Fei-Zyfer Inc as well as Gillam-Fei in Belgium and Frequency Electronics Inc will probably not release any specs on the protocol being used. :( /Juha ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] How dangerous if a Rb lamp broken?
Hello Charles: Don't worry about it, my brain auto ignore any comments of technology irrelevant. Hui At 2013-07-10 13:58:47,Charles P. Steinmetz charles_steinm...@lavabit.com wrote: Perrier wrote: You have absolutely NOTHING to fear. Here is why Please keep your political comments to yourself and off the list (however humorous you might think they are). This is simply not the place for them. Thank you, Charles ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] How dangerous if Rb lamp broken?
Hello Robert: I am a little confuse how exactly much Rb87 in a bulb? Some people say that it's couple millgram, but you tell me it's half a millgram, which is ture? You message is good new to me, it let me relax, but I don’t understand Bq/gram unit, would you please convert it to mSV unit, I can know the how many mSV of human is safety by search by internet. I mean in extreme situration, if all Rb87 of buld sprinkled in my table, how many exposure value will I accepet in 24 Hour? I found some people (other electronics fan) wrote a formula about Rb87 radioactivity calculation, that is: 1mg Rubidium * 27.835 * 0.27835 * 6.02 *10^23 / 87/4.88/10^10/2/365/24/3600*1=625. So, decay energy=0.283MeV, about 600 electron per second, Is this calculation correct? 27.835=Percent of Rb87 6.02*10^23 = Avogadro's constant 87= Atomic weight 4.88*10^10== Half time of Rb87 (Year) 2 = Rb87 decay to half 365 = day of year 24 = hour of day 3600 = second of hour I am very glad to read many relay of my email, I want say thanks for everyone. As you said why people be afraid of Rb87 but not other things, I think maybe because we don’t understand it. Such as, I don’t afraid of RF exposure, because I know it, I am a HAM and learned many RF exposure knowledge, but of atom and radioactivity, I have only poor knowledge. Thanks everyone again, this is amazing mail-list. Say sorry for my poor English. Hui At 2013-07-09 19:40:50,Robert Atkinson robert8...@yahoo.co.uk wrote: Hi Hui, Most bulbs use a mix of Rb87 and Rb85 with an activity of around 1500 Bq/gram with less than half a millgram in a typical bulb, that's less than a Bq per bulb (about 20 picocuries). You will get more ardiation from using low sodium salt (potassium chloride) on your food. Potasium is essential for life and Rb is chemically similar. In short don't worry. Robert G8RPI (also a geiger nut and collector of radioactive material) From: Hui Zhang ba...@163.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Tuesday, 9 July 2013, 5:07 Subject: [time-nuts] How dangerous if Rb lamp broken? Dear Group: I have four compact Rb Stanard, but I am worried about what if my Rb lamp broken in accident someday? How dangerous of this situration? Is Rb87 came out from Rb lamp will be a disaster? You know I haven't any beta rays detect instrument. Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] How dangerous if Rb lamp broken?
Dear Group: I have four compact Rb Stanard, but I am worried about what if my Rb lamp broken in accident someday? How dangerous of this situration? Is Rb87 came out from Rb lamp will be a disaster? You know I haven't any beta rays detect instrument. Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] PIN define of VECTRON OCXO 217-8422
Dear Group: I just got a VECTRON 5Mhz OCXO the model is 217-8422, does anyone have its datasheet or PIN define? Thanks a lot. Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP53132A vs SR625
Hello SAID: I am very sorry I almost missed this email in my inbox, and say sorry for reply so late, and I am very appreciate you wrote so many useful word for me. I answred your in quote part in this email. Thanks a lot. After a short consideration, finally I bought SR625, now it on my workbench, I am very satisfied with its work. I still have few quesiton: 1) When I use long gate time to mesure fequency (like as 10s or more), the STOP LED in channel B will light up, at moment in the reading result, the STOP will off few second, and light up again, is this normal? 2) When I use TI mesurement function, I connect GPS's 1PPS to CH1 and use a BNC tee split signal with 1.5m cable to CH2, in the TIME mode, I saw the 0xx etc, if I changed cable length the reading will change, what mean of this reading? Hui, rent one of each if you can before you make your choice. I have both, and the HP unit is much easier to use once you know which button sequence to push to get more than just Frequency/Time-Interval type measurements - these can be single-button events on the HP unit. Even offsetting and normalizing frequencies becomes very easy after a couple of days of using the unit, there is no setting that takes me longer than about 5 seconds to set up, so while not perfect, the user interface can be learned easily. I find the SR620 to have too many buttons(!) I always find myself searching for just that one button. Anyways, more buttons are just more things that can fail. If you are a pilot, and have used a Garmin 430W GPS in your life, then the HP user interface is no challenge whatsoever and seems very easy to use.. The SR-620 has it's advantages, especially when you just do one single type of measurement, but for me it has a huge number of disadvantages, and I mostly use the 53132A for that reason: 1) I paid quite a bit of money and I had it calibrated and fixed by SRS, and it still exhibits a significant frequency offset with a perfect reference and perfect DUT!!! SRS says a small frequency error is normal, well that prevents me from using the unit as a frequency counter, for me it's only useful as a relative display frequency counter. HP doesn't have such a frequency error, so no worries there. I will pay attention and observe those problem 2) The SRS unit is s loud that it's totally annoying and unacceptable for long measurements. Many folks reported this here before. It's just bad. Whining like crazy. Indeed this is little problem but really troube me. 3) The SRS unit is 19 wide, huge, heavy, and clunky. I need my counter portable, only the HP unit will do No problem, I like huge and heavy device, they are usually reliabe. 4) The SRS unit has a much lower MTBF because of all the parts inside, and it needs finicky adjustments, see item 1) above. The HP unit either works, or is just dead. Not much to adjust. Different technology generation. And the coolness factor: a nice florescent tube display is so much more modern looking than those clunky old 7-segment LED's.. Yes I agree you, the SR625 is 90's product, sort of old and vintage, I am very worry about his lift. The only thing I can do it pray god I can have good luck. 5) The SRS unit is usually $1000 more than the HP unit, and you don't know how good the unit is you are buying because of all of the calibration stuff. Usually there is no hit-or-miss issue with the HP units, they either work, or are dead. My SR625's price not bad, very close with HP53132, although it's old. I hope it can work five to ten years that I will be satisfied. That said, the HP unit doesn't measure well at 10MHz, so I mostly use a divide-by-two to get one more digit of resolution out of it, and it's time interval resolution is not as good as the SR620. But for time interval measurements I use a Wavecrest DTS unit that blows the SR620 and the HP out of the water anyways.. Bye, Said Hui In a message dated 2/7/2013 16:39:04 Pacific Standard Time, ba6it at 163.com writes: Hello Dear Group: I am very glad to see so many replies in the morning, and I am very grateful to every time nuts gave me useful information, your proposal has strengthened my determination, in fact, I am also very like SR625, So I will to find and buy a good shape SR625 for my new time interval measure instrument. Thanks again for everyone's advice, which is very useful to make a choice for me. Sorry for not reply everyone's mail. Best Regards! Hui Zhang [time-nuts] HP53132A vs SR625 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] HP53132A vs SR625
Dear Group: I am intend to buy a second-hand counter, I have not decided yet between SR625 and HP53132A, they have very close price in surplus market of here, so, which is better choice? Any suggestion will be appreciated. Best Regards! Hui Zhang ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP53132A vs SR625
Hello Dear Group: I am very glad to see so many replies in the morning, and I am very grateful to every time nuts gave me useful information, your proposal has strengthened my determination, in fact, I am also very like SR625, So I will to find and buy a good shape SR625 for my new time interval measure instrument. Thanks again for everyone's advice, which is very useful to make a choice for me. Sorry for not reply everyone's mail. Best Regards! Hui Zhang At 2013-02-08 05:12:37,Brooke Clarke bro...@pacific.net wrote: Hi Hui: The HP 53132A is called a Universal Frequency Counter can count frequency at 12 digits per second, but that is not the case when it is measuring time intervals. The human interface might be called user hostile. The front panel of the SR 620 is marked Universal Time Interval Counter and is great for making time interval measurements. That's why I traded my 53132 for the SR620. http://www.prc68.com/I/TandFTE.shtml#SR620 If you're doing Time Nuts measurements you probably have a good 10 MHz oscillator that you can feed into either of these counters so getting an optional time base in one of them serves little purpose. Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html Hui Zhang wrote: Dear Group: I am intend to buy a second-hand counter, I have not decided yet between SR625 and HP53132A, they have very close price in surplus market of here, so, which is better choice? Any suggestion will be appreciated. Best Regards! Hui Zhang ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lady Heather on a Laptop
I also use a vintage IBM laptop to running Lady Heather, It's 128MB ram and 350MHz CPU, works very well. Hui - At 2012-09-27 21:39:10,Michael Baker mp...@clanbaker.org wrote: Hi, All-- I have dedicated an ancient Windows 95 laptop to sitting on a shelf in my workshop running Lady Heather. It's CPU speed is only 400 MHz and it only has a very small hard-drive and almost no memory but it seems to handle LH well. Except for some of the frequent power outages we see around here, it has been running LH 24/7 for the last 3 years, maybe a little longer. The screen is on continually and is somewhat dimmer than when I installed it but it is still quite useable. Mike Baker - ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3801 Replacement GPS Receiver Card
I just bought a second-hand Z3801A, it also had a error message when self test - GPS Rcv error, and I saw a red LED on main board on. I want test it alone but I don't know GPS board's pin define, can someone tell me? Thanks. Hui At 2012-09-16 21:20:26,Azelio Boriani azelio.bori...@screen.it wrote: Anyway, are you sure that the GPS unit is faulty? Can you test it alone? The unit is responsive on the serial port? Is the Z3801A sending commands? Can you verify with a 'scope on the serial line if there is any signal? On Sun, Sep 16, 2012 at 2:54 PM, Mike S mi...@flatsurface.com wrote: On 9/15/2012 2:11 PM, paul swed wrote: Then respond back with whatever the response might be and then simply pass through in both direction whatever comes next. Could an updated rcvr be used. Is this init command really the only gotcha? It's more than just the init command. The z3801a also sends @@Ca, @@Cg, @@Ab, @@Ah, @@Aj, @@Ak, @@Al, @@An, @@Ar, @@Av, @@Ax, @@Ay, @@AB, @@AC, @@AD, @@Ba, @@Bc, @@Bk, @@Cg, @@At, and @@Bn, none of which are available on an M12 (which would be the logical target if you're going to the trouble of an adapter), so would need to be converted to other commands, and the correct response returned. In addition, the response to the @@Bb command (Visible sat status) would need modification. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] About heterodyne method?
Hello Azelio: Thank you very much, I use this keyword searched in internet and got many useful infomation, include some block diagram. Thank you! Hui At 2012-07-26 22:55:26,Azelio Boriani azelio.bori...@screen.it wrote: Search for DMTD, dual mixer time difference. On Thu, Jul 26, 2012 at 4:43 PM, Hui Zhang ba...@163.com wrote: Hello everyone: I hnow 'heterodyne method' is very useful method of pricision frequency measurement (use DBM and LPF), but I only found very few infomation when I searched in early docments, Can someone give me more information about this 'heterodyne method'? The block diagram is best. I will very appreciate of that. Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] About heterodyne method?
Hello Bob: Many thanks for your kindly and detailed explanation, I think I am completely get it. I have few minicircuit SBL-1 mixer module, but I lacks a limiter circuit, I deicide to do some test near times. If I have any progress I will be glad to tell you in this mail list. By use DMTD keyword, I got many useful infomation of this method, when I finish original single mixer circuit, I want try DMTD method late times. All of these two method is interesting. Thanks again for your help! Hui At 2012-07-27 00:55:56,Bob Camp li...@rtty.us wrote: Hi Quick summary: Computing / period counters give you a constant number of digits of resolution regardless of input frequency. Back when this stuff was developed a counter that gave you nine digits a second was pretty common. Typical setup: 1) Take two oscillators and tune them 1 to 10 Hz apart. The technique only works if at least one of the oscillators can be tuned. 2) Run the oscillators into a double balanced mixer. Normally levels near the maximum are used on both inputs. 3) Low pass filter the output. You want to keep the RF out of the 1 to 10 Hz beat note. Various terminations seem to help the sensitivity of various mixers (high impedance at audio, reactive termination at RF etc). 4) Run the audio beat note into a limiter. The design of the limiter can be fairly simple or quite elaborate. You need the limiter because the counters input channels rarely do well with audio sine waves. 5) Count the frequency of the audio on your counter. If you start off with 10 MHz and set them 1 Hz apart, you get a 1x10^7 amplification of the frequency error. If you count that to nine digits, the resulting resolution would be 1x10^-15. Of course resolution and accuracy are not the same thing. Measurement noise will dominate the readings past a certain point. A typical setup should get you below 1x10^-11 at one second without a lot of effort. A good setup can get you to 5x10^-13 at one second with common parts. A fancy setup with a complex limiter can go below 1x10^-13 at one second. Yes indeed there's a bit more than that to it, but that should get you started. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Hui Zhang Sent: Thursday, July 26, 2012 10:44 AM To: time-nuts@febo.com Subject: [time-nuts] About heterodyne method? Hello everyone: I hnow 'heterodyne method' is very useful method of pricision frequency measurement (use DBM and LPF), but I only found very few infomation when I searched in early docments, Can someone give me more information about this 'heterodyne method'? The block diagram is best. I will very appreciate of that. Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] About heterodyne method?
Hello everyone: I hnow 'heterodyne method' is very useful method of pricision frequency measurement (use DBM and LPF), but I only found very few infomation when I searched in early docments, Can someone give me more information about this 'heterodyne method'? The block diagram is best. I will very appreciate of that. Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP5386A GPIB
Hello Mike: Thanks for your kindly advice, but here have some difficulties to post picture. I decide to put this device away in somewhere and find more technical article like as HP-IB or HP-85 program guide for study. I'll probably buy a second-hand PCI interface GPIB card. I also hope I can pick up this USB-GPIB at right times. Anyway, thank a lot for you and everyone's help. I will continue to watch this mail list. Hui At 2012-06-19 10:26:34,Michael Blazer mbla...@satx.rr.com wrote: Hui, It sounds like the issue is with your OEM GPIB controller. Why don't you post some pictures of it and see if any of the Time Nuts can identify it? It probably is a generic version of some common interface. Mike On 6/18/2012 8:43 AM, Hui Zhang wrote: Hello Mike: Many thanks for useful information. The problem is I have no more information of my USB-GPIB controller, so I don't know any command of this device. I used stupid way to send my command, if I want send DI to increase the display digis, I will convert DI to HEX code, it's 0x44 and 0x49. I add 0x36 (0x36 is HP5386's address) and 0x0A in the begin and end of my command sequence separately. So my command looks like 0x3644490A0D, the command was worked. but I don't know what command can set my counter to talk status, I am also confused on how to initiate its read cycle. Hui At 2012-06-17 23:45:07,Michael Blazer mbla...@satx.rr.com wrote: Hui, The older instruments have a very simple command structure. You don't need the ? to query. Typically just doing a GPIB Read command (ibread for NI controllers) will address the counter to output and it will send the current reading. This can cause a problem if you request data too soon after a setup command. You'll get the previous reading. The ENTER S ; N$ command just reads from address S into the variable N$. It sound like you need the command to your USB-GPIB controller to get it to read. The counter is probably ready to send the data, the controller just needs to initiate its read cycle. Mike On 6/17/2012 10:17 AM, Hui Zhang wrote: I have a old HP5386A counter and a OEM USB-GPIB controller(no tech support), I use a serial port debug program to send command via USB-GPIB to HP5386A, when I send FU2(Measure period) or DI(increment display digis), the 5386 response the command and worked well, the other control command in the HP's manual also worked well. But I don't know how to read the measure value from 5385A, in my HP3478A mutilmeter case, I just send a ?, it will return voltage value to software, but at 5386A, the “?” not work, I got error message 52 on LCD panel. I read the HP5386's manual, the demonstrates used ENTER command to get measure value, but the ENTER is a HP-BASIC command of vintage HP-85 computer. I don't know how to send similar command to control my counter, can someone give me some advice? Thank you! Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP5386A GPIB
Hello Mike: Many thanks for useful information. The problem is I have no more information of my USB-GPIB controller, so I don't know any command of this device. I used stupid way to send my command, if I want send DI to increase the display digis, I will convert DI to HEX code, it's 0x44 and 0x49. I add 0x36 (0x36 is HP5386's address) and 0x0A in the begin and end of my command sequence separately. So my command looks like 0x3644490A0D, the command was worked. but I don't know what command can set my counter to talk status, I am also confused on how to initiate its read cycle. Hui At 2012-06-17 23:45:07,Michael Blazer mbla...@satx.rr.com wrote: Hui, The older instruments have a very simple command structure. You don't need the ? to query. Typically just doing a GPIB Read command (ibread for NI controllers) will address the counter to output and it will send the current reading. This can cause a problem if you request data too soon after a setup command. You'll get the previous reading. The ENTER S ; N$ command just reads from address S into the variable N$. It sound like you need the command to your USB-GPIB controller to get it to read. The counter is probably ready to send the data, the controller just needs to initiate its read cycle. Mike On 6/17/2012 10:17 AM, Hui Zhang wrote: I have a old HP5386A counter and a OEM USB-GPIB controller(no tech support), I use a serial port debug program to send command via USB-GPIB to HP5386A, when I send FU2(Measure period) or DI(increment display digis), the 5386 response the command and worked well, the other control command in the HP's manual also worked well. But I don't know how to read the measure value from 5385A, in my HP3478A mutilmeter case, I just send a ?, it will return voltage value to software, but at 5386A, the “?” not work, I got error message 52 on LCD panel. I read the HP5386's manual, the demonstrates used ENTER command to get measure value, but the ENTER is a HP-BASIC command of vintage HP-85 computer. I don't know how to send similar command to control my counter, can someone give me some advice? Thank you! Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP5386A GPIB
Hello Ton: Thanks for your reply. I tried to send 0x040A to HP5386, but I did not receive any response. I pressed RESET button when I got 52 error message, the error message disappeared and frequency reading displayed in the receive buffer area of my Serial port Assitant software. Hui At 2012-06-18 15:29:07,Ton t...@mubo.nl wrote: Hello Hui, I found that I needed: Ag488Wrap.ibeos(devDesc, 0x040A); // 04 = terminate read when 0A = /n is detected as part of the initialization. Without this, the communication with my 5384A timed out. Also, see what happens when you press the reset button when you get error 52 while you continue to loop on ibread with a timer. Best regards, Ton On 17-Jun-12 17:45, Michael Blazer wrote: Hui, The older instruments have a very simple command structure. You don't need the ? to query. Typically just doing a GPIB Read command (ibread for NI controllers) will address the counter to output and it will send the current reading. This can cause a problem if you request data too soon after a setup command. You'll get the previous reading. The ENTER S ; N$ command just reads from address S into the variable N$. It sound like you need the command to your USB-GPIB controller to get it to read. The counter is probably ready to send the data, the controller just needs to initiate its read cycle. Mike On 6/17/2012 10:17 AM, Hui Zhang wrote: I have a old HP5386A counter and a OEM USB-GPIB controller(no tech support), I use a serial port debug program to send command via USB-GPIB to HP5386A, when I send FU2(Measure period) or DI(increment display digis), the 5386 response the command and worked well, the other control command in the HP's manual also worked well. But I don't know how to read the measure value from 5385A, in my HP3478A mutilmeter case, I just send a ?, it will return voltage value to software, but at 5386A, the “?” not work, I got error message 52 on LCD panel. I read the HP5386's manual, the demonstrates used ENTER command to get measure value, but the ENTER is a HP-BASIC command of vintage HP-85 computer. I don't know how to send similar command to control my counter, can someone give me some advice? Thank you! Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] HP5386A GPIB
I have a old HP5386A counter and a OEM USB-GPIB controller(no tech support), I use a serial port debug program to send command via USB-GPIB to HP5386A, when I send FU2(Measure period) or DI(increment display digis), the 5386 response the command and worked well, the other control command in the HP's manual also worked well. But I don't know how to read the measure value from 5385A, in my HP3478A mutilmeter case, I just send a ?, it will return voltage value to software, but at 5386A, the “?” not work, I got error message 52 on LCD panel. I read the HP5386's manual, the demonstrates used ENTER command to get measure value, but the ENTER is a HP-BASIC command of vintage HP-85 computer. I don't know how to send similar command to control my counter, can someone give me some advice? Thank you! Hui ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
