Re: [time-nuts] Brooke's Valpey picture
Hi Randy: Sorry, I was trying to give you a link to the Valpey VF150 data sheet, but their web site does not allow that. Have Fun, Brooke Clarke http://www.prc68.com/P/Prod.html Products I make and sell http://www.prc68.com/Alpha.shtml All my web pages listed based on html name http://www.PRC68.com http://www.precisionclock.com http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Web Cam WB6BNQ wrote: Gee Brooke, If you made the picture any bigger it would not have fit on my screen. 73BillWB6BNQ Brooke Clarke wrote: Hi Randy: Those appear to be the very common 14 pin dip IC oscillators. pin 7 = ground pin 14 = Vdd pin 8 = Out pin 1 may be no connection or may be inhibit. Check with DMM in Ohm and diode function. It sure looks like: http://www.valpeyfisher.com/images/productshots/xo/vf150.jpg Have Fun, Brooke Clarke http://www.prc68.com/P/Prod.html Products I make and sell http://www.prc68.com/Alpha.shtml All my web pages listed based on html name http://www.PRC68.com http://www.precisionclock.com http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Web Cam Randy Leifer wrote: Novice here. I have a small electronics lab at home. PART 1: I have these Valpey Fisher VF154 1 MHz oscillators. I could not find any details at the VF website on this particular model #. (OC, VC, ???) Picture/link below PART 2: Does anyone have a link to a simple circuit, where I could use these to get a stand-alone signal @ around 1 or 2 volts? This is just an educational value/exercise for me, I don't really have an intended use (yet) for these. I have some high-speed opamps and buffers? Thanks, =Randy Leifer= http://i5.photobucket.com/albums/y177/Midiot/DSCN.jpg ___ 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] OT: Anyone programmed HP 59306A relay actuator (or other old device)?
I know this is a bit off-topic here, but has anyone here ever programmed an HP 59306A relay actuator http://www.home.agilent.com/agilent/product.jspx?cc=USlc=engnid=-536900193.536882169 which consists of 6 SPDT relays programmable via GPIB? Over the years I have programmed a number of sophisticated instruments including spectrum analysers, lock-in amplifiers, the 5370B time-interval counter, 8970A noise figure meters, bench multimeter etc. On the face of it, I would think a box with only 6 relays to be much simpler than any of these, but I am having a hard time with it. It may be it's age - the commands needed might be a bit different from anything I know. I'm trying to control it with a National Instruments GPIB board in a Sun workstation. (It's on a PCI bus and is the same card one would use in a PC. ). Page 3-4 of the HP 59306A's manual (page 25 in the PDF) ) http://www.home.agilent.com/agilent/redirector.jspx?action=refcname=AGILENT_EDITORIALcc=USlc=engckey=824199nid=-536900193.536882169.07pid=101496%3Aepsg%3Apro has an example program, but it's unlike any example I have ever seen. There's no ibdev, ibwrt or similar - its basically a list of the state (high or low) of the control lines and digital IO lines. Sequence #1 says EOP=high, REN=high, MRE=low, digital IO lines ascii '?' I assume this is basically dd=ibdev(0, gpib_address, 0, T3s, 1, 0); ibclr(dd); but I've no idea if this is so, since I'm not sure what lines ibclr() sets high/low. I guess I will have to set up some LEDs on the bus to see what is happening. I'm pretty sure the sequences 4 to 9 can be set with ibwrt(dd,A,1); ibwrt(dd,3,1); ibwrt(dd,5,1); ibwrt(dd,B,1); ibwrt(dd,3,1); ibwrt(dd,A,1); although it might be possible to use ibwrt(dd,A35B35,6); (It's not clear to me if this can accept multiple commands at once). Anyone got any ideas of what NI commands can be used to executes sequences 1,2,3 and 10 in table 3-3? David Kirkby ___ 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] OT: Anyone programmed HP 59306A relay actuator (orother old device)?
Daun Yeagley wrote: Hi David Don't worry about all the level stuff. That's internal to the box (59306). The only thing you need to worry about is how to generate the proper commands on the bus for your particular H/W-S/W combination. But looking at the example program, one sends * ? to clear all listeners * % to listen * The commands to set relays, such as B123, or A1 * REN=H to reset to local control. But all 4 combinations have different TTL levels on the control lines. On my bench multimeter, something as simple as dd=ibdev(0, gpib_address, 0, T3s, 1, 0); /* open a device at address 'gpib_address' with 3 s timeout. */ ibclr(dd); /* Clear it */ ibwrt(dd,PRESET,6); /* Can't recall what this command did on my meter, but it works! */ ibwrt(dd,DCV,3); /* Set to DC voltage. Command ends in 3, as DCV is 3 characters */ will set it to DC voltage. If I want frequency, the last command would be ibwrt(dd,FREQ,4); /* ends in 4, as FREQ is 4 characters */ But this HP 59306A relay actuator will *not* respond similarly if I send ibwrt(A1,2); /* Unsuccessfully try to join contacts A-C on relay 1 */ In various attempts, I've managed to get the odd click from the relays, but nothing useful is happening. I've got two of these, and neither is doing what I expect, so I suspect the units are not faulty, but just my bad programming. In hopefully simple terms, you need to address the 59306 as a listener, and then send the ASCII string that represents the relay state you need. In Didier's example: 1) to turn all channels off, send B123456 2) to turn channel 1 on: send A1 You don't need (or want an end of line sequence or anything). When done sending the command, just unaddress it. Perhaps that is what I am doing wrong. I am not un-addressing it. But I've never had to before. I've normally on other instruments just sent the command via ibwrt(), then read responses with ibrd(). For this instrument, I don't believe there is anything that can be read - you can't for example read the state of the relays, so I don't think there is any need for using ibrd(). Hope that removes a bit of fog. Daun ___ 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] OT: Anyone programmed HP 59306A relay actuator (orother old device)?
Remember these units don't have uC, so any signal that would normally depend on some timing must be generated externally, i.e. come from the bus. I suspect the box might need some signals that other equipment (uC equipped) may not absolutely require. However, this being a piece of HP equipment, I am pretty confident that is will strictly obey (and require strict adherence to) the HPIB specification, even in areas where more recent equipment will show significant tolerance. Now that I think of it, I really never cared much for the low level NI programming. I did some of it way back under DOS, and ever since finding the BlackBox and more recently the Prologix controllers, I have not looked back. Didier -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dr. David Kirkby Sent: Saturday, May 24, 2008 9:13 AM To: [EMAIL PROTECTED]; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] OT: Anyone programmed HP 59306A relay actuator (orother old device)? Daun Yeagley wrote: Hi David Don't worry about all the level stuff. That's internal to the box (59306). The only thing you need to worry about is how to generate the proper commands on the bus for your particular H/W-S/W combination. But looking at the example program, one sends * ? to clear all listeners * % to listen * The commands to set relays, such as B123, or A1 * REN=H to reset to local control. But all 4 combinations have different TTL levels on the control lines. On my bench multimeter, something as simple as dd=ibdev(0, gpib_address, 0, T3s, 1, 0); /* open a device at address 'gpib_address' with 3 s timeout. */ ibclr(dd); /* Clear it */ ibwrt(dd,PRESET,6); /* Can't recall what this command did on my meter, but it works! */ ibwrt(dd,DCV,3); /* Set to DC voltage. Command ends in 3, as DCV is 3 characters */ will set it to DC voltage. If I want frequency, the last command would be ibwrt(dd,FREQ,4); /* ends in 4, as FREQ is 4 characters */ But this HP 59306A relay actuator will *not* respond similarly if I send ibwrt(A1,2); /* Unsuccessfully try to join contacts A-C on relay 1 */ In various attempts, I've managed to get the odd click from the relays, but nothing useful is happening. I've got two of these, and neither is doing what I expect, so I suspect the units are not faulty, but just my bad programming. In hopefully simple terms, you need to address the 59306 as a listener, and then send the ASCII string that represents the relay state you need. In Didier's example: 1) to turn all channels off, send B123456 2) to turn channel 1 on: send A1 You don't need (or want an end of line sequence or anything). When done sending the command, just unaddress it. Perhaps that is what I am doing wrong. I am not un-addressing it. But I've never had to before. I've normally on other instruments just sent the command via ibwrt(), then read responses with ibrd(). For this instrument, I don't believe there is anything that can be read - you can't for example read the state of the relays, so I don't think there is any need for using ibrd(). Hope that removes a bit of fog. Daun ___ 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. Internal Virus Database is out-of-date. Checked by AVG. Version: 7.5.519 / Virus Database: 269.23.11/1422 - Release Date: 5/8/2008 5:24 PM ___ 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] OT: Anyone programmed HP 59306A relay actuator (orother old device)?
Hi David You'll need a scope to look at the lines. If you try reading with a voltmeter, you'll only get the average value of the data that is being transmitted. There are a couple of control line as part of the bus. The most important one for our purposes here is the ATN line. When this line is asserted, Data on the 8 DATA lines is in what is known as the COMMAND mode. In this mode, the ASCII code you see make up the commands to do the Unlisten, Untalk, Listen, and Talk commands and the associated addresses. You don't need to worry about that stuff. That's what the drivers are for. At the programming level, all you need to be concerned with is who's talking (the controller, i.e. the computer), and who's the listener (the 59306). As an aside, there can be only one talker, but many listeners. Other (transparent) details include the handshake lines and some other dedicated support lines that may or may not be used in any particular scenario. So again, all you need to do is address the 59306 as a listener, and send the specific ASCII characters that comprise the command. With this instrument, since it is so very simple, doesn't even know what to do with end of line sequences. (CR/LF). It would simply ignore them. (I say this because most computers customarily send this unless specifically suppressed). Hope this helps. If not enough, I'll have to see if I can dig out some of the old HPIB tutorials I used to teach from twenty some years ago. Daun -Original Message- From: Dr. David Kirkby [mailto:[EMAIL PROTECTED] Sent: Saturday, May 24, 2008 10:13 AM To: [EMAIL PROTECTED]; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] OT: Anyone programmed HP 59306A relay actuator (orother old device)? Daun Yeagley wrote: Hi David Don't worry about all the level stuff. That's internal to the box (59306). The only thing you need to worry about is how to generate the proper commands on the bus for your particular H/W-S/W combination. But looking at the example program, one sends * ? to clear all listeners * % to listen * The commands to set relays, such as B123, or A1 * REN=H to reset to local control. But all 4 combinations have different TTL levels on the control lines. On my bench multimeter, something as simple as dd=ibdev(0, gpib_address, 0, T3s, 1, 0); /* open a device at address 'gpib_address' with 3 s timeout. */ ibclr(dd); /* Clear it */ ibwrt(dd,PRESET,6); /* Can't recall what this command did on my meter, but it works! */ ibwrt(dd,DCV,3); /* Set to DC voltage. Command ends in 3, as DCV is 3 characters */ will set it to DC voltage. If I want frequency, the last command would be ibwrt(dd,FREQ,4); /* ends in 4, as FREQ is 4 characters */ But this HP 59306A relay actuator will *not* respond similarly if I send ibwrt(A1,2); /* Unsuccessfully try to join contacts A-C on relay 1 */ In various attempts, I've managed to get the odd click from the relays, but nothing useful is happening. I've got two of these, and neither is doing what I expect, so I suspect the units are not faulty, but just my bad programming. In hopefully simple terms, you need to address the 59306 as a listener, and then send the ASCII string that represents the relay state you need. In Didier's example: 1) to turn all channels off, send B123456 2) to turn channel 1 on: send A1 You don't need (or want an end of line sequence or anything). When done sending the command, just unaddress it. Perhaps that is what I am doing wrong. I am not un-addressing it. But I've never had to before. I've normally on other instruments just sent the command via ibwrt(), then read responses with ibrd(). For this instrument, I don't believe there is anything that can be read - you can't for example read the state of the relays, so I don't think there is any need for using ibrd(). Hope that removes a bit of fog. Daun ___ 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] OT: Anyone programmed HP 59306A relay actuator (orother old device)?
Didier Juges wrote: Remember these units don't have uC, so any signal that would normally depend on some timing must be generated externally, i.e. come from the bus. I suspect the box might need some signals that other equipment (uC equipped) may not absolutely require. However, this being a piece of HP equipment, I am pretty confident that is will strictly obey (and require strict adherence to) the HPIB specification, even in areas where more recent equipment will show significant tolerance. Could be that. Now that I think of it, I really never cared much for the low level NI programming. I did some of it way back under DOS, and ever since finding the BlackBox and more recently the Prologix controllers, I have not looked back. I've always used the NI controllers and never had any problems with any micro processor controlled instrument. This is the first item I've ever programmed a device without a micro, and so far it is beating my attempts to program it. Didier ___ 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] OT: Anyone programmed HP 59306A relay actuator (or other old device)?
Hi David: The HP 59000 series boxes were some of the very first HP-IB instruments made. They are what might be called glue boxes used to build systems. As has been pointed out there is not a micro controller and in addition there is no IEEE-488 interface chip (this was before there was an IEEE specification). In addition they are slow. The handshake on the HP-IB slows the buss down to the slowest instrument that's on the buss even if you are not talking to that instrument. This has two implications, first, it's good to put the slow instruments on a different bus from instruments where you want speed and second, when talking to a slow instrument add a time delay after you send it a command before the program proceeds so that there's time for the instrument to process the command. The 59306 has two modes, local and remote. You can press buttons on the front panel in local mode and use it without a remote control. When you want to use remote control you must first send the remote command $. The front panel switches stay pressed and when the box is put into local mode those switch positions well be restored. The three letter line names are control lines on the HP-IB and modern interface cards take care of most of those signals. But, since there's no micro controller you should not send any characters after the single command byte. No CRLF, no EOI. You may need to explicitly set the termination sequence so that these are avoided. For more on the 59000 series boxes see: http://www.prc68.com/I/HP59000.shtml These are are handy when building HP-IB systems since they also allow manual control. Have Fun, Brooke Clarke http://www.prc68.com/P/Prod.html Products I make and sell http://www.prc68.com/Alpha.shtml All my web pages listed based on html name http://www.PRC68.com http://www.precisionclock.com http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Web Cam Dr. David Kirkby wrote: I know this is a bit off-topic here, but has anyone here ever programmed an HP 59306A relay actuator http://www.home.agilent.com/agilent/product.jspx?cc=USlc=engnid=-536900193.536882169 which consists of 6 SPDT relays programmable via GPIB? Over the years I have programmed a number of sophisticated instruments including spectrum analysers, lock-in amplifiers, the 5370B time-interval counter, 8970A noise figure meters, bench multimeter etc. On the face of it, I would think a box with only 6 relays to be much simpler than any of these, but I am having a hard time with it. It may be it's age - the commands needed might be a bit different from anything I know. I'm trying to control it with a National Instruments GPIB board in a Sun workstation. (It's on a PCI bus and is the same card one would use in a PC. ). Page 3-4 of the HP 59306A's manual (page 25 in the PDF) ) http://www.home.agilent.com/agilent/redirector.jspx?action=refcname=AGILENT_EDITORIALcc=USlc=engckey=824199nid=-536900193.536882169.07pid=101496%3Aepsg%3Apro has an example program, but it's unlike any example I have ever seen. There's no ibdev, ibwrt or similar - its basically a list of the state (high or low) of the control lines and digital IO lines. Sequence #1 says EOP=high, REN=high, MRE=low, digital IO lines ascii '?' I assume this is basically dd=ibdev(0, gpib_address, 0, T3s, 1, 0); ibclr(dd); but I've no idea if this is so, since I'm not sure what lines ibclr() sets high/low. I guess I will have to set up some LEDs on the bus to see what is happening. I'm pretty sure the sequences 4 to 9 can be set with ibwrt(dd,A,1); ibwrt(dd,3,1); ibwrt(dd,5,1); ibwrt(dd,B,1); ibwrt(dd,3,1); ibwrt(dd,A,1); although it might be possible to use ibwrt(dd,A35B35,6); (It's not clear to me if this can accept multiple commands at once). Anyone got any ideas of what NI commands can be used to executes sequences 1,2,3 and 10 in table 3-3? David Kirkby ___ 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] OT: Anyone programmed HP 59306A relay actuator (or other old device)?
Brooke Clarke wrote: Hi David: The HP 59000 series boxes were some of the very first HP-IB instruments made. They are what might be called glue boxes used to build systems. As has been pointed out there is not a micro controller and in addition there is no IEEE-488 interface chip (this was before there was an IEEE specification). Hi Bruce, Seems they are very old then. In addition they are slow. The handshake on the HP-IB slows the buss down to the slowest instrument that's on the buss even if you are not talking to that instrument. This has two implications, first, it's good to put the slow instruments on a different bus from instruments where you want speed and second, when talking to a slow instrument add a time delay after you send it a command before the program proceeds so that there's time for the instrument to process the command. I did think about adding a few sleep() commands, but it went out of my mind. I'll try that later tonight when I get home. The speed is a bit worrying, as it will slow things down if this device takes significantly longer to respond than the instrument making the measurement. Unfortunately the 1U server I intended using for this only has one PCI slot, so I could not add another GPIB board. Anyway, that is another issue - the first problem is to be able to get it working at all. I did think about programming the parallel port of the Sun - something that was very easy on PCs under DOS, but is far from as simple on a multi-user UNIX operating system. The 59306 has two modes, local and remote. You can press buttons on the front panel in local mode and use it without a remote control. When you want to use remote control you must first send the remote command $. The front panel switches stay pressed and when the box is put into local mode those switch positions well be restored. Where do you get the $ as being the remote command? It appears to be % in my manual, but I'm not sure if that would be sent with ibwrt or not. The fact the control lines are different in the manual for sending the % to other commands makes me think it might have to be done another way. The three letter line names are control lines on the HP-IB and modern interface cards take care of most of those signals. But, since there's no micro controller you should not send any characters after the single command byte. No CRLF, no EOI. You may need to explicitly set the termination sequence so that these are avoided. You might have solved it there. I'm opening the device with dd=ibdev(0, gpib_address, 0, T3s, 1, 0); the 5th argument to ibdev is the 1, not 0. The manual for linux at least says If |send_eoi| is nonzero, then the EOI line will be asserted with the last byte sent during writes So it seems I might be sending EOI, which you are saying I should not do. I hope you are right!!! I'm not in a position to test now, as I am about 50 miles away from the instrument. 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.
Re: [time-nuts] OT: Anyone programmed HP 59306A relay actuator (or other old device)?
Brooke Clarke wrote: But, since there's no micro controller you should not send any characters after the single command byte. No CRLF, no EOI. You may need to explicitly set the termination sequence so that these are avoided. Looking at the manual on the HP 59306A, it says of the EOI line Not monitored or driven, terminated by resistive network. This rather suggests to me it will make no difference whether the EOI is asserted or not and so whether I open the device with dd=ibdev(0, gpib_address, 0, T3s, 1, 0); or dd=ibdev(0, gpib_address, 0, T3s, 0, 0); will make no difference. 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.
Re: [time-nuts] OT: Anyone programmed HP 59306A relay actuator (or other old device)?
Hi David: Sorry about that. You're correct EOI and a number of the other control signals are not used. Do you have a complete schematic, mine has the left side missing and I can't read the names of the lines. Have Fun, Brooke Clarke http://www.prc68.com/P/Prod.html Products I make and sell http://www.prc68.com/Alpha.shtml All my web pages listed based on html name http://www.PRC68.com http://www.precisionclock.com http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Web Cam Dr. David Kirkby wrote: Brooke Clarke wrote: But, since there's no micro controller you should not send any characters after the single command byte. No CRLF, no EOI. You may need to explicitly set the termination sequence so that these are avoided. Looking at the manual on the HP 59306A, it says of the EOI line Not monitored or driven, terminated by resistive network. This rather suggests to me it will make no difference whether the EOI is asserted or not and so whether I open the device with dd=ibdev(0, gpib_address, 0, T3s, 1, 0); or dd=ibdev(0, gpib_address, 0, T3s, 0, 0); will make no difference. 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.
Re: [time-nuts] Valpey - VF154
At 12:42 PM -0700 5/24/08, Randy Leifer wrote: I applied 5v + ground to the proper pins. Pin 1 left open. Results vary from part to part, but within 10kHz of 1MHz.especially if voltage is dropped to 4.1v. 3.3v output is further off. I don't know if a load on the output makes a difference...(load resistor value ? ). Scope shows a square wave...but not a pretty one. A 10nf cap across the power pins helps freq stability, but does nothing to the scope image. Is it pointless to attempt to get a good sine wave out of this? ...or best to get a real sine wave part ? These I'm guessing, are TTL/CMOS type. =Randy= Randy, Those do sound like old-fashioned TTL oscillators. They will require 5V to run. Expect a frequency error range of about 50 PPM. The easy way to get a sine wave is to add a low pass filter. Something made out of some resistors and capacitors will produce a decent result. You might want to add an amplifier after that. And don't expect good frequency accuracy or phase noise, since these are meant to clock a microprocessor, not provide an accurate frequency reference. -- --David Forbes, Tucson, AZ http://www.cathodecorner.com/ ___ 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] OT: Anyone programmed HP 59306A relay actuator (or other old device)?
Brooke Clarke wrote: Hi David: Sorry about that. You're correct EOI and a number of the other control signals are not used. Do you have a complete schematic, mine has the left side missing and I can't read the names of the lines. Have Fun, Brooke Clarke I found this on the Agilent site: http://www.home.agilent.com/agilent/redirector.jspx?action=refcname=AGILENT_EDITORIALcc=USlc=engckey=824199nid=-536900193.536882169.07pid=101496%3Aepsg%3Apro that's all I have. I've not checked carefully the schematic, but it did say something about EOI not being used. I'm home now, with the equipment upstairs, but I've had a few pints of beer, so will tackle this again tomorrow. I don't think I'll get much sense out of it tonight. 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.
Re: [time-nuts] Valpey - VF154
Those do sound like old-fashioned TTL oscillators. They will require 5V to run. Expect a frequency error range of about 50 PPM. Many newer cans run on 3.3V. And don't expect good frequency accuracy or phase noise They might make good thermometers. :) (You probably have to keep the supply voltage stable.) -- These are my opinions, not necessarily my employer's. I hate spam. ___ 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.
