Re: [time-nuts] HP 53132A Display
Hi Bert, Disconnect filament from PCB (one end is enough) and connect to regulated DC Power supply. Adjust voltage to 8V and current to 0.3-0.4A. In a dark room should see very small red light. Slowly increase little bit voltage until color goes to orange-yellow. Important - do not move display during procedure. Keep filament powered for 5-7 min and after that reconnect filament to PCB. Power on counter and share result. Best regards Philip Sent from my iPhone > On 1.04.2016 г., at 22:14, Bert Kehren via time-nuts > wrote: > > Did buy a HP53132a counter mainly to use with the RS 232 for high > resolution and to have a backup for my very favorite 5345a with 40 GHz head. > Sadly > the very clean unit has a very weak display to the extend that an 8 looks > like a 9. Have the option for a full refund but would like to explore > alternatives. Any ideas. > Bert Kehren > ___ > 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] PRS 10 and serial port communication
Hi Mike and group, For sure I cannot change value for TO - Time-tag offset (1816). In terminal, no matter what value I put for TO when read it with TO? always receive 1816. I try with 0, 1815, -1816. Also try with space between TO and digits, without space, lower case, upper case - no differense. In manual has procedure for calibrating TO value. There explained that 1PPS_IN must be connected to 1PPS_OUT and read value for TT. Properly adjusted TO should return value for TT close to 0. I have 3733 in this configuration for TT. About FC - picture you saw is little bit older. I don't have black square any more. But fc!? is 65450,3114,1774,2817 - for me is strange why so many times power is turned off/on? Philip From: Mike Cook To: Philip Zahariev ; Discussion of precise time and frequency measurement Sent: Tuesday, 8 March 2016, 9:31 Subject: Re: ***SPAM*** Re: [time-nuts] PRS 10 and serial port communication > Le 8 mars 2016 à 01:56, Philip Zahariev via time-nuts a > écrit : > > Hello group, > > I have significant progress with generator. And there were new questions :-) > Frequency was little bit higher than 10 MHz - after correction of PLL > constants SP and MO now is just on spot. > > In documentation is not clear described what is active state of signal > 1PPS_IN. I found that signal must be 1 and goes to 0 during PPS pulse. After > experience with SERIAL line inverter this time was easy (and have free > inverters). Opposite is situation of output 1PPS_OUTPUT - his state is 0 and > goes 1 during PPS pulse :-) > > 1. I found that AD8 - Amplified ac photosignal is changing between 1.120 to > 3.991 and any value are different than previous, sometimes jumps are more > than 2.xxx (monitoring with RBMon) - Is this usual? I think so. At least I have that order of variability on mine. > > 2. AD10 - Case temperature (10 mV/°C) has value 0.781 which means 78°C. I > remember that temperature has to be below 40°C, but when mount 2 heatsinks > from computer CPU (socket 370) temperature decrease to 67-68°C. Do I need to > install fans (don't like noise) or increase size? Are this 40°C was measured > with external thermometer or means that AD10 need to be lower than 0.4xx? > My PRS10s are in the same ball park (0.736) on one I am looking at. I have installed SRS supplied Bench Heat Sinks on them and the measured external baseplate temperature is 42.9°. If it’s good enough for SRS then it’s good enough for me though I suspect that within reason lower is better. However, that said, I don’t think that SRS put a fan in the 725 which is a PRS10 + buffered outputs and that is in a case where temps are likely to be higher.. > 3. Firmware of my device is 3.15. Before value for TO - Time-tag offset > (1816) from RBMon has Red square. According manual in this version of > firmware TO is not user changeable. That is not strictly true. With 3.15, you can change the current value but you cannot write it to EEPROM (TO!) so that the new value is used at power on. That With 3.24 you can change the EEPROM value. I am not sure why it is flagged RED as from my experience the colors used are. None: in spec or not different from EEPROM Black: different from EEPROM value Blue: nearing a limit. Red: Out of spec (ex. SF hit the wall at -2000) Equally the black flag on your FC values is strange as the stats value is in limits. If you use FC!? to see what the EEPROM values are you will see 4 values, including the stats figure. From the one in front of me: 47 number of power cycles 5168 number of times DAC values written to EEPROM ( twice a day from my experience so you can get a rough idea of accumulated power on time) 1532 high and 2056 low DAC values used at reset/power on > Is it available file with new firmware version? Processor on device is > MC68HC711E20CFN3 - that means I need to buy new empty processor and program > it. What improvements was made in newer version of firmware? I don’t know what changes were made in the different firmware revisions but I think that you would need SRS to do the upgrade as recalibration would be required. > > Best regards > Philip > > ___ > 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. "The main function of a modern police force is filling in forms." ___ 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] PRS 10 and serial port communication
Hello group, I have significant progress with generator. And there were new questions :-) Frequency was little bit higher than 10 MHz - after correction of PLL constants SP and MO now is just on spot. In documentation is not clear described what is active state of signal 1PPS_IN. I found that signal must be 1 and goes to 0 during PPS pulse. After experience with SERIAL line inverter this time was easy (and have free inverters). Opposite is situation of output 1PPS_OUTPUT - his state is 0 and goes 1 during PPS pulse :-) 1. I found that AD8 - Amplified ac photosignal is changing between 1.120 to 3.991 and any value are different than previous, sometimes jumps are more than 2.xxx (monitoring with RBMon) - Is this usual? 2. AD10 - Case temperature (10 mV/°C) has value 0.781 which means 78°C. I remember that temperature has to be below 40°C, but when mount 2 heatsinks from computer CPU (socket 370) temperature decrease to 67-68°C. Do I need to install fans (don't like noise) or increase size? Are this 40°C was measured with external thermometer or means that AD10 need to be lower than 0.4xx? 3. Firmware of my device is 3.15. Before value for TO - Time-tag offset (1816) from RBMon has Red square. According manual in this version of firmware TO is not user changeable. Is it available file with new firmware version? Processor on device is MC68HC711E20CFN3 - that means I need to buy new empty processor and program it. What improvements was made in newer version of firmware? Best regards Philip ___ 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] PRS 10 and serial port communication
As already tell you I have success with inverters and now can monitor state of PRS 10. Attached send current status for comments. Any help appreciated. Best regardsPhilip From: Hal Murray To: Philip Zahariev ; Discussion of precise time and frequency measurement Cc: hmur...@megapathdsl.net Sent: Friday, 4 March 2016, 11:43 Subject: Re: [time-nuts] PRS 10 and serial port communication > As I already write PRS10 is configured as serial communication. With > oscilloscope I can see serial signals, but when enter this signal in > computer with TTL level USB2serial converter all information is repeatable > character unknown for me and not as described in manual. You may need to add or remove an inverter in there. Most serial ports on microprocessors and USB to serial chips are expecting a TTL to RS232 level shifter and the standard level shifter chips all have an inverter. If there are 0 or 2 inverters it should work. Some GPS modules don't have any level shifter. Some devices include an inverter but not the level shifter. That doesn't meet specs but it generally works if you connected it to a real serial port (with level shifter). I would connect a scope to the output side of the USB to serial chip and send it occasional characters and use that as a reference for what a character is supposed to look like. Then look to the input side and see if it looks similar. In particular, verify that the idle level is the same. Then check the baud rate and parity. -- These are my opinions. 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.
Re: [time-nuts] PRS 10 and serial port communication
Hello Hal, Thank you very much! You was right! One additional inverter in both line (Rx and Tx) between PRS10 and USB2Serial fix issue with communication. Best regards Philip Sent from my iPhone > On 4.03.2016 г., at 11:43, Hal Murray wrote: > > >> As I already write PRS10 is configured as serial communication. With >> oscilloscope I can see serial signals, but when enter this signal in >> computer with TTL level USB2serial converter all information is repeatable >> character unknown for me and not as described in manual. > > You may need to add or remove an inverter in there. > > Most serial ports on microprocessors and USB to serial chips are expecting a > TTL to RS232 level shifter and the standard level shifter chips all have an > inverter. If there are 0 or 2 inverters it should work. > > Some GPS modules don't have any level shifter. Some devices include an > inverter but not the level shifter. That doesn't meet specs but it generally > works if you connected it to a real serial port (with level shifter). > > I would connect a scope to the output side of the USB to serial chip and send > it occasional characters and use that as a reference for what a character is > supposed to look like. > > Then look to the input side and see if it looks similar. In particular, > verify that the idle level is the same. Then check the baud rate and parity. > > > > -- > These are my opinions. 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.
Re: [time-nuts] PRS 10 and serial port communication
Hi Jarl, As I already write PRS10 is configured as serial communication. With oscilloscope I can see serial signals, but when enter this signal in computer with TTL level USB2serial converter all information is repeatable character unknown for me and not as described in manual. For test i change baud rate, number of stop bits, number of bits without success. Also trace signal to U302 MC68HC11 pin 20 and 21 and both TX and RX are the same as on J100 (external connector) - time/period and amplitude has TTL levels. For me looks like internal ROM has incorrect bits or processor is not in normal state and response from serial port coming from different subroutine. I expect hints how to check processor state. Or how to push processor in state where will have normal serial communication. Best regards Philip > On 4.03.2016 г., at 9:35, Jarl Risum wrote: > > OK, Philip > > If you have confirmed with a Oscilloscope that no RS-232 communication is > present on the TXD output pin, I sugggest you check the status of R247/R248 > and R353/R354 - see the manuals chapter on "PRS 10 Applications" (page 20), > description of pin 4 and pin 7. > > Good luck > > Jarl > > 2016-03-03 20:08 GMT+01:00 Philip Zahariev : >> Hi Jarl, >> >> >> >> Of course I use TTL level USB serial converter. Unfortunately, as I write no >> communication, or at least not what I expect. >> >> >> >> Best regards >> >> Philip >> >> >> >> From: Jarl Risum [mailto:jarl.ri...@gmail.com] >> Sent: Wednesday, March 2, 2016 11:49 PM >> To: philip.zahar...@yahoo.com; philip_zahar...@yahoo.com >> Subject: PRS 10 and serial port communication >> >> >> >> Philip, >> >> The outgoing RS-232 port from PRS 10 is a TTL inverter with an approx. 1 >> kohm series resistor. >> >> See diagram of the microcontroller board, upper right corner. >> >> For this reason you may have problems reading the outgoing RS-232 messages >> with a standard RS-232 PC input. But you may see the transmission taking >> place with a oscilloscope. >> >> I have had the same problem with my PRS 10 and solved it with a simple 2 >> transistor non-inverting amplifier fed from a +12V source. >> >> If interested, I can send you the diagram. >> >> Cheers from >> >> OZ9MO / Jarl >> > ___ 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] PRS10 and missing serail port communication
I forgot to tell you, that during tests I use TTL (5V) level USB to serial converter. -Original Message- From: Mike Cook [mailto:michael.c...@sfr.fr] Sent: Wednesday, March 2, 2016 11:15 PM To: Philip Zahariev; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] PRS10 and missing serail port communication > Le 2 mars 2016 à 15:50, Philip Zahariev via time-nuts a > écrit : > > Hello group, > > Recently obtained from eBay PRS10 marked as no-lock. Of course my > first task was to open device and see what is current state of lamp, > capacitor and etc. > surrounding parts. My surprise was that all things look pretty good > (of course is used). And frequency is not correct :-) Actualy first > 1-2 minutes frequency is pretty close to 10 MHz, but after all thing > is ready (hot) frequency go far away. > > My questions: > > 1. How bright should be the light from lamp? Few seconds after power > is applied to device lamp start shining, but I can see only if room > light is close to dark or if I use magnifying glass focused on hole for > inspection. > > 2. I cannot communicate with PRS10 using RbMon10 (software from SRS). > Only obtain repeatable characters from PRS10 if start terminal program > with baud rate 9600 baud, 8 bits, no parity, with 1 start and 1 stop > bit and no answer of any command according manual. Double checked > according schematics and port is configured as serial. Any advice how to > obtain communication? RbMon10 will normally configure the PC serial port correctly. So it might be due to voltage levels? The PRS10 port is 0-5V TTL and not the usual +/-12V RS232 levels. Also it requires XON/XOFF protocol. That would need to be configured for a Terminal prog connection. > > Best regards > Philip > > ___ > 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. "The main function of a modern police force is filling in forms." ___ 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] PRS10 and missing serail port communication
Hello group, Recently obtained from eBay PRS10 marked as no-lock. Of course my first task was to open device and see what is current state of lamp, capacitor and etc. surrounding parts. My surprise was that all things look pretty good (of course is used). And frequency is not correct :-) Actualy first 1-2 minutes frequency is pretty close to 10 MHz, but after all thing is ready (hot) frequency go far away. My questions: 1. How bright should be the light from lamp? Few seconds after power is applied to device lamp start shining, but I can see only if room light is close to dark or if I use magnifying glass focused on hole for inspection. 2. I cannot communicate with PRS10 using RbMon10 (software from SRS). Only obtain repeatable characters from PRS10 if start terminal program with baud rate 9600 baud, 8 bits, no parity, with 1 start and 1 stop bit and no answer of any command according manual. Double checked according schematics and port is configured as serial. Any advice how to obtain comuniaction? Best regards Philip ___ 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] Datum TS2100 10MHz frequency drift
Hello Time-nuts group, few weeks ago I acquire TS2100GPS with TCXO. Few days ago receive MTI OCXO and install in device. After replacement change gain and filter constant as described byJason Rabel's post from 9/26/2010 Unfortunately I'm not happy with results because 10 MHz output signal after GPS lock (both leds on front "Locked" and "tracking" are "ON") has frequency drift (phase shift) with period around one second plus minus ~18 deg (+-5 ns) compared to other 10 MHz. I measure this by 2 channel scope on 10 nS sweep, first channel connected to TS2100 10 MHz output and second channel connected to 10 MHz from other GPSDO and sync by second channel. I'm sure that issue is in TS2100 because if disconnect GPS antenna frequency jumping disappear and frequency is more or less on spot (very very slow movement of one sinusoid against other) Also monitoring EFC voltage to OCXO with voltmeter has the same behavior confirmed by command "root timing util tfp 0" - again jumping up and down between 0xb4b5 and 0xb4c9.Firmware of TS2100 was 3.1 and "upgrade" to 4.1 does not solve problem. I suspect algorithm for adjustment of OCXO, but can't believe that this is normal. Can someone confirm that frequency change is not normal behavior. And of coarse I'm open for any suggestion how to solve problem. ___ 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.
