[time-nuts] HP 58503A Flashing Front Panel LEDs
Hi, I recently purchased an HP 58503A from eBay. When I power it on, with or without an antenna, the power LED illuminates on the front panel, followed by each LED one at a time. Then, after a moment, the unit alternates between all front panel LEDs being illuminated and only the power LED at a rate of about once every 3 seconds. I opened the unit and checked the rail voltages. I have 5.22V, +15.01V, -15.00V. The oven is warming. There are some LEDs on the board near the antenna jack and I have two red illuminated and a single green. I can’t get anything on the serial port. Has anyone seen this before? I have a 30 day ROR but I like this model and would love to fix it if anyone has any advice. Thanks, Mike ___ 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 58503A question (EFC: Err)
Mitch, Thanks for the screen shot. That means 99% of your 58503 is working; very good news. If you look at the last line if your screen shot (attached), the self-test is failing due to EFC (Electronic Frequency Control), the voltage that pulls the quartz oscillator low or high to keep it locked at 10 MHz via GPS. The manual suggests this means the oscillator has drifted out of range, but there may be additional causes like the DAC or its bipolar power supply or the oscillator oven or oven power supply, etc. I've not seen this error before on my 58503's, but it narrows down your problem significantly. Rather than guessing what the root cause is I'll cc time-nuts [1] to see if anyone else has seen this error, or knows what you can do about it. There's also a useful thread at: www.eevblog.com/forum/testgear/hp-58503a-efc-error/ /tvb [1] I see your original email went to time-nuts-owner@, which ends up going privately to the couple of us who run time-nuts. But if you post to time-nuts@febo.com, then it goes out to the 1800 member list. If you want to join see http://www.leapsecond.com/time-nuts.htm for details about the list. If you don't want to bother joining you can read the live feed for this month at: www.febo.com/pipermail/time-nuts/2018-January/date.html If you want to read anything every written about the 58503A, on time-nuts search google using-- site:febo.com 58503A - Original Message - From: Mitch Van Ochten To: 'Tom Van Baak' Sent: Thursday, January 04, 2018 7:21 PM Subject: RE: HP 58503A question Hi Tom, This unit has the display also. After applying power, the LED's on the front do a scan from left to right, the display says "HP 58503A" then the "STATUS" LED starts blinking once per second. Thirty seconds later a message appears saying "SLFTST ERR". The same instant the leftmost RED LED at the left rear of the circuit board comes on. There is a GREEN LED (rightmost) in the set of six LED's, which continuously blinks once per second. The 10 MHz output is present and the RS-232 is working. After clearing the alarm, the "OCXO WARMUP" message appears, then a few minutes later a message saying "GPS FAILED" occurs. After waiting a while another message says "0 SAT AQUIRD". Regardless of how long you wait, it always says "0 SAT AQUIRD". I have the unit attached to a known good active antenna. Bought a replacement GPS receiver for it and installed it but the same error still appears. It seems as though it is not recognizing the signal from the GPS receiver, and it may be related to the self-test error. Here is what SatStat shows: Best regards, mitch From: Tom Van Baak [mailto:t...@leapsecond.com] Sent: Thursday, January 04, 2018 9:21 PM To: mitch Subject: Re: HP 58503A question I opened one up here and it also has no chip in that socket. I never noticed that before. If you want me to dig further I will. What test failed? Or what are the other symptoms? Do you get 10 MHz or 1PPS or GPS lock? Have you tried querying it with the RS232/ SCPI interface? /tvb - Original Message - From: Mitch Van Ochten Sent: Thursday, January 04, 2018 5:02 AM Subject: HP 58503A question Hi John, I recently acquired an older HP 58503A. After power-up the "status" LED blinks for about 30 seconds, then a message comes up saying it failed self-test. Inside it is missing a large IC (see attached photo). Do you have one of these units? If so, is yours also missing the IC? Best regards, Mitch Van Ochten ___ 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 58503A GPS time and frequency receiver - How do I determine why the ALARM LED is on?
I've got an HP 58503A purchased from China a couple of years ago. It has a bit of a hard life, having been in water at some time. But it seems to work ok, as far as I can tell. Today there was a power failure for 5 minutes or so. The red ALARM LED is on. It is not clear to me why, although of course I'm aware there was a power outage, which almost certainly caused this, although I can't be 100% sure. Could it be that the log is full? I had a program running trying to get the position multiple times in a loop, to get some sort of average, so I can well believe I filled the log up. But this was a few weeks ago. The log is clearly full . scpi > diag:log:read:all? Log status: Full Log 001:19970504.00:00:00: Log cleared Log 002:19970504.00:00:00: System preset Log 003:19970504.00:00:00: Power on Log 219:20170107.05:30:17: Position hold mode started Log 220:20170107.05:30:57: Holdover started, not tracking GPS Log 221:20170107.05:31:03: Survey mode started Log 222:20170107.05:33:04: GPS lock started Nothing has been logged since 7th January. I know for a fact there was a power outage on the 19th and today (25th), so I suspect the log being full has NOT caused the ALARM light to come on. A fault, that is not logged, has caused it. scpi > SYSTEM:STATUS? --- Receiver Status --- SYNCHRONIZATION . [ Outputs Valid ] SmartClock Mode ___ Reference Outputs ___ >> Locked to GPS TFOM 3 FFOM 0 Recovery 1PPS TI +9.5 ns relative to GPS Holdover HOLD THR 1.000 us Power-up Holdover Uncertainty Predict 432.0 us/initial 24 hrs ACQUISITION [ GPS 1PPS Valid ] Tracking: 6 Not Tracking: 1 Time PRN El Az SS PRN El AzUTC 15:03:50 25 Jan 2017 5 23 186 7324 21 252GPS 1PPS Synchronized to UTC 13 84 110 81 ANT DLY 0 ns 15 59 289 94 Position 20 45 245 96 MODE Hold 28 51 76 104 30 27 68 83 LAT N 51:39:04.155 LON E 0:46:36.381 ELEV MASK 20 deg HGT +45.55 m (MSL) HEALTH MONITOR .. [ ERROR ] Self Test: Err Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv: OK scpi > The self-test shows an error, but no indication what the error was, as the log was full. I have a fairly good idea what may have happened. Sometimes when the unit is powered on, the voltages on the PSU appear to go out of spec. I'm not convinced this is really happening, as a multimeter on peak hold could not catch any glitch, but I have not tried a fast scope. I'm just wondering if there's anything else I can do to see what caused the LED to come on. I suspect if I execute the self-test, it will pass and the light go out, but I'd rather find the reason before doing that. 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] HP 58503A chassis part needed
Hello, I'm in the process of restoring my 58503A. In the process of disassembling it, the rear plastic frame that is held to the back panel with the two T15 Torx screws had become brittle with age and it cracked into several pieces as I was removing it. It will be difficult to get all of the small pieces glued back into place, so I'd rather just replace it with an intact part. I have a spare rear frame from another HP bench instrument in my spare parts bin, but much to my surprise I found that the center-to-center hole spacing of the screws on the 58503A frame is about 7.5", whereas on all of the other HP bench instruments that I've checked it's only about 7.375", so my spare frame does not fit. Does anyone have, or know where to get, the proper rear frame for my 58503A? Thanks, Stan ___ 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 58503A failure
I have had an HP 58503A GPSDO with the Option 001 display running continuously for over ten years without a problem-that is, until today. When I looked at it this morning, the display was showing a valid time, but it was frozen and not advancing. Pushing on the buttons had no effect. I unplugged it, let it rest for a minute or so, and plugged it in again, and this time the display lit up with a string of several identical "garbage" characters that extended only part way across the display. The rest of the display was blank. Pushing on the front panel buttons had no effect, the display at one point changed to a different string of meaningless characters and, needless to say, the clock never resumed running. Unplugging it and plugging it in again resulted in the same behavior, although different "garbage" characters were displayed, including some of the annunciators in the VFD that are just 53131A and 53132A counter functions (+WID, -WID, GATE, etc.). I opened it up and checked the power supplies, and they were spot on (+5 VDC, +15 VDC, and -15 VDC) with no measurable ripple. I also checked to see if I could communicate with it through the serial port using GPSCom (which has worked fine in the past), but no luck. I just got "Receiver Timeout" error messages. The power LED glows steady green, but no other LEDs light, even when the buttons are pushed. I'm not sure if a service manual or CLIP even exists, but I certainly couldn't locate any service info whatsoever. Any ideas? Thanks, Stan ___ 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 58503A Com 4 conflict
To add a small dose of additional complexity, Visual Basic 6.0 (and I suspect other dev tools of that generation) only support COM ports up to 16. Not as bad as 4, but still a problem on occasion. Didier KO4BB On January 4, 2015 12:03:05 PM CST, Bob Camp kb...@n1k.org wrote: Hi Ok, off into serial land …. The GPSDO does not really know or care what port it’s on. It will be just as happy on port 119 as on port 4. It (by design) does care about the baud rate / data bits / parity / stop bits. This is as true with a USB to serial as with a direct serial card. That’s the good news. Now for the rest of the news. If your computer operating system is old enough, you may only *have* 4 com ports. Bad news there = upgrade the computer. Typically this is a Windows 95 and earlier issue. If the software running on the computer is old enough it may only *know* how to use 4 com ports. Bad news is same = upgrade the software. Typically this is a Windows 95 era (mid 90’s) issue. If the drivers on the serial to usb converter are old enough, they may only talk as 4 com ports (I’ve never seen this on a modern OS). Same news = upgrade the driver. All this relates to Windows. The cutoff times and versions for other OS’s are a bit more obscure. The same basic details apply. If you are running on an XP or newer machine, you should have far more than 4 com ports available. If you are running any of the newer ( = past 2000) software to talk to the box, it should be quite happy to deal with more than 4 com ports. My *guess* is that you need a different piece of software. Exactly what you are doing will determine which one you need. ( = more info required). - On Jan 4, 2015, at 10:50 AM, James Robbins jsrobb...@earthlink.net wrote: My new old HP58503A wants to connect to my PC on Com 1-4. Other PC devices are already using those 4 Com ports. Is there any way to connect it to a Com port other than one of those 1 to 4? I currently use an Edgeport USB-to-Serial Converter which works very well to communicate with the PC and to assign Com ports to my various GPS units. But, as far as I know, the chosen Edgeport Com port must fall within the range of Com ports which for which the device is designed. If this has been answered, please point me to the discussion. Many thanks. And, Happy New Year to all, with wishes for a more peaceful (and timely - couldn't resist) year. I have this terrible urge to start a calendar thread revolving around “new” years … so far I’ve resisted the urge. It’s *very* difficult ….arhhh…. Bob Jim Robbins N1JR ___ 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. -- Sent from my Motorola Droid Razr HD 4G LTE wireless tracker while I do other things. ___ 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 58503A Com 4 conflict
Thanks Bob, Didier and Rex for the consult on the Com 4 Conflict and the teaching. Update: First, sorry for not posting adequate information in my question to start with. The result of some emails was a clarification that it was not the 58503A which was causing the issue with the Com ports, but SatStat which only allowed Com 1-4 (a very old program). I was able to switch to using GPSCon instead of SatStat and it provided many unused Com port choices. So, the 58503A and my ThinkPad are both happy campers. Jim Robbins N1JR ___ 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 58503A Com 4 conflict
You left out a lot of details, like what OS your PC is running, Assuming it is Windows XP or greater, you may be able to juggle the assigned com port. If you are using a USB/serial adapter, be sure it is plugged in so it shows on the devices list. You need to open Device Manager. One way is Start/settings/Control Panel. If it is Win 7+ Device Manager should be in the list. If XP, select System, the Hardware tab at the top, then the Device Manager button. -- I don't have a Win 8 machine; I assume it is the same as Win 7. Find your serial device under 'Ports (Com LPT)'. If you are not sure which one and it is a USB adapter, you can unplug it and see which one goes away. Double-click on the one you want to change. In the window that opens, select the Port Settings tab at the top. You'll get a window with the baud rate, etc. Select the Advanced button. Then in the lower left of the window is the assigned Com Port. Click the pull-down triangle button and you'll get a list where you can select a different Com Port number. If all the ones you want are flagged with (In use), you may have to back out and try to find a listing for the device that is using a low Com port and select it to change its number higher to free the one you want to use. I'm not sure what happens if you try to change to a port that is (In use). Maybe it tries to work it out for you. I haven't tried it. I'd suggest Com 4 or Com 2 as your best choices. So I don't have an exact answer. It depends on what is using the lower numbers now, Hopefully you can rearrange them using this method to find something that works. On 1/4/2015 7:50 AM, James Robbins wrote: My new old HP58503A wants to connect to my PC on Com 1-4. Other PC devices are already using those 4 Com ports. Is there any way to connect it to a Com port other than one of those 1 to 4? I currently use an Edgeport USB-to-Serial Converter which works very well to communicate with the PC and to assign Com ports to my various GPS units. But, as far as I know, the chosen Edgeport Com port must fall within the range of Com ports which for which the device is designed. If this has been answered, please point me to the discussion. Many thanks. And, Happy New Year to all, with wishes for a more peaceful (and timely - couldn't resist) year. Jim Robbins N1JR ___ 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 58503A Com 4 conflict
My new old HP58503A wants to connect to my PC on Com 1-4. Other PC devices are already using those 4 Com ports. Is there any way to connect it to a Com port other than one of those 1 to 4? I currently use an Edgeport USB-to-Serial Converter which works very well to communicate with the PC and to assign Com ports to my various GPS units. But, as far as I know, the chosen Edgeport Com port must fall within the range of Com ports which for which the device is designed. If this has been answered, please point me to the discussion. Many thanks. And, Happy New Year to all, with wishes for a more peaceful (and timely - couldn't resist) year. Jim Robbins N1JR ___ 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 58503A Com 4 conflict
Hi Ok, off into serial land …. The GPSDO does not really know or care what port it’s on. It will be just as happy on port 119 as on port 4. It (by design) does care about the baud rate / data bits / parity / stop bits. This is as true with a USB to serial as with a direct serial card. That’s the good news. Now for the rest of the news. If your computer operating system is old enough, you may only *have* 4 com ports. Bad news there = upgrade the computer. Typically this is a Windows 95 and earlier issue. If the software running on the computer is old enough it may only *know* how to use 4 com ports. Bad news is same = upgrade the software. Typically this is a Windows 95 era (mid 90’s) issue. If the drivers on the serial to usb converter are old enough, they may only talk as 4 com ports (I’ve never seen this on a modern OS). Same news = upgrade the driver. All this relates to Windows. The cutoff times and versions for other OS’s are a bit more obscure. The same basic details apply. If you are running on an XP or newer machine, you should have far more than 4 com ports available. If you are running any of the newer ( = past 2000) software to talk to the box, it should be quite happy to deal with more than 4 com ports. My *guess* is that you need a different piece of software. Exactly what you are doing will determine which one you need. ( = more info required). - On Jan 4, 2015, at 10:50 AM, James Robbins jsrobb...@earthlink.net wrote: My new old HP58503A wants to connect to my PC on Com 1-4. Other PC devices are already using those 4 Com ports. Is there any way to connect it to a Com port other than one of those 1 to 4? I currently use an Edgeport USB-to-Serial Converter which works very well to communicate with the PC and to assign Com ports to my various GPS units. But, as far as I know, the chosen Edgeport Com port must fall within the range of Com ports which for which the device is designed. If this has been answered, please point me to the discussion. Many thanks. And, Happy New Year to all, with wishes for a more peaceful (and timely - couldn't resist) year. I have this terrible urge to start a calendar thread revolving around “new” years … so far I’ve resisted the urge. It’s *very* difficult ….arhhh…. Bob Jim Robbins N1JR ___ 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-58503A
Hi, The past week I had to replace more than 30 capacitors in various of my home electronics, some were bulged and others not so. There were 7 in a computer motherboard, 10 in other, 8 in a TV set power supply, 2 in an external USB disk power supply and the rest in other things, I know the grand total because I kept it together to test a cheap EMS meter against a LCR bridge. In my experience, all bulged capacitors are very ill, high ESR and very low capacitance, causing a lot of symptoms to appear (many of them intermittent). And when a capacitor bulges normally some or all of its neighbors are bad also, even without any external sign. I check them with a bridge and this is confirmed most of the times, so I suggest to replace the bulged capacitor and when you are there check or replace the others, they will bulge or burst in short time, high ripple currents and heat makes electrolytics the less reliable electronic components today. Best regards, Ignacio EB4APL On 02/01/2015 a las 14:34, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: On 1 January 2015 at 17:03, Andy Bardagjy andybarda...@gmail.com wrote: Sounds like the GPS receiver is hosed. I think there are two different receivers used in the 58503a, unfortunately I'm away from my lab, otherwise I could check mine. It is a standard part, and may be available on the surplus market. Before replacing, I'd check the usual suspects, power supply health (look for failed electrolytics) and re-seat the gps board to board connector. Happy to measure things on my 58503a. The fact it originally failed with errors indicting the GPS receiver was not ok (nt Power- OK, OCXO- OK, EFC-OK GPS RCV-err. I, but later he can't communicate with the 58503A over RS-232, to me indicates the problem is not likely to be the just (if at all) the GPS receiver. As you say, power supply is a possible problem. I have a 58503A here that has a problem. Sometimes when power is first applied, the Alarm light stays on, and the log show power supply voltage errors. Yesterday I must have switched the thing on/off about 30 times before I managed to get the Alarm light to stay on. At the time I had a handheld DVM connected to the +15 V rail with the peak hold mode enabled. At least according to the handheld DVM, the +15 V rail was normal, so either the transient is too short for my handheld DVM to see, or the 85050A is reporting data voltage data incorrectly. Both are fairly like I suspect. I noticed a *very* slight bulge at the top of on a 100 uF, 400 V capacitor on the switch mode power supply. For various reasons, I am not going to change that cap now, but obviously a failed cap could cause this sort of problem. 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] HP-58503A
Sounds like the GPS receiver is hosed. I think there are two different receivers used in the 58503a, unfortunately I'm away from my lab, otherwise I could check mine. It is a standard part, and may be available on the surplus market. Before replacing, I'd check the usual suspects, power supply health (look for failed electrolytics) and re-seat the gps board to board connector. Happy to measure things on my 58503a. Andy ◉ Bardagjy.com ◉ +1-404-964-1641 On Dec 30, 2014, at 12:35 PM, Richard Thorpe kisso...@gmail.com wrote: This list was recommended to me by the elecraft list. I have an HP-58503A sat disciplined “clock” that puts out a steady 10MHz to my K3 radio. Its been working 24/7 for years, I monitor it with David Anderson's Mac GPS Control X software on my iMac. Several days ago error messages showed up i.e.: Health- err, Self Test-err, Int Power- OK, OCXO- OK, EFC-OK GPS RCV-err. Its not tracking any sats and now I cannot event communicate with it at all even with a simple com program. Is there anyone out therE who can fix these things? Any suggestions would be appreciated. Thank you. Richard Thorpe K6CG ___ 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-58503A
On 1 January 2015 at 17:03, Andy Bardagjy andybarda...@gmail.com wrote: Sounds like the GPS receiver is hosed. I think there are two different receivers used in the 58503a, unfortunately I'm away from my lab, otherwise I could check mine. It is a standard part, and may be available on the surplus market. Before replacing, I'd check the usual suspects, power supply health (look for failed electrolytics) and re-seat the gps board to board connector. Happy to measure things on my 58503a. The fact it originally failed with errors indicting the GPS receiver was not ok (nt Power- OK, OCXO- OK, EFC-OK GPS RCV-err. I, but later he can't communicate with the 58503A over RS-232, to me indicates the problem is not likely to be the just (if at all) the GPS receiver. As you say, power supply is a possible problem. I have a 58503A here that has a problem. Sometimes when power is first applied, the Alarm light stays on, and the log show power supply voltage errors. Yesterday I must have switched the thing on/off about 30 times before I managed to get the Alarm light to stay on. At the time I had a handheld DVM connected to the +15 V rail with the peak hold mode enabled. At least according to the handheld DVM, the +15 V rail was normal, so either the transient is too short for my handheld DVM to see, or the 85050A is reporting data voltage data incorrectly. Both are fairly like I suspect. I noticed a *very* slight bulge at the top of on a 100 uF, 400 V capacitor on the switch mode power supply. For various reasons, I am not going to change that cap now, but obviously a failed cap could cause this sort of problem. 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] HP-58503A
This list was recommended to me by the elecraft list. I have an HP-58503A sat disciplined “clock” that puts out a steady 10MHz to my K3 radio. Its been working 24/7 for years, I monitor it with David Anderson's Mac GPS Control X software on my iMac. Several days ago error messages showed up i.e.: Health- err, Self Test-err, Int Power- OK, OCXO- OK, EFC-OK GPS RCV-err. Its not tracking any sats and now I cannot event communicate with it at all even with a simple com program. Is there anyone out therE who can fix these things? Any suggestions would be appreciated. Thank you. Richard Thorpe K6CG ___ 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 58503A service manual with schematics
John, Most time nuts have searched for this particular manual at one stage. I am afraid it is unobtainium. marks -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of gianni Sent: Thursday, 29 May 2014 7:09 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 58503A service manual with schematics hi John I am new in the list but not in the art here a lot of manuals http://exodus.poly.edu/~kurt/manuals/manuals/HP%20Agilent/ Gianni In 28 maggio 2014, starb...@uplink.net scritto: Hello to the time experts, I own a nice HP-58503A and I would be happy to find a pdf version of the complete service manual for it. Is somebody in the position to help me or to give me a hint where I could find it? Thank you very much, regards, John ___ 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 58503A service manual with schematics
hi John I am new in the list but not in the art here a lot of manuals http://exodus.poly.edu/~kurt/manuals/manuals/HP%20Agilent/ Gianni In 28 maggio 2014, starb...@uplink.net scritto: Hello to the time experts, I own a nice HP-58503A and I would be happy to find a pdf version of the complete service manual for it. Is somebody in the position to help me or to give me a hint where I could find it? Thank you very much, regards, John ___ 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 58503A service manual with schematics
Hello to the time experts, I own a nice HP-58503A and I would be happy to find a pdf version of the complete service manual for it. Is somebody in the position to help me or to give me a hint where I could find it? Thank you very much, regards, John ___ 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 58503A Service Manual with schematics
Does anyone have a service manual for the HP 58503A GPS Time and Frequency Receiver? Thanks, John ___ 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 58503A acurate UTC time
Thanks guys It is now reading UTC, but only after a power off routine. That confused me ! I can't afford the time to let it re-survey, and used the Query command with a 0 instead of a ?. Re-querying it with a question mark it replied that there would be no survey on power up. The iPhone photo of the screen is here www.soundhifi.com/FOURUMIMAGES/gps.jpg So the question is, will this really stop the annoying survey every time ? And finally, does anyone have the circuit of the display so I can put a switch in the reduce the brightness please ? Thanks 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] HP 58503A acurate UTC time
So the question is, will this really stop the annoying survey every time ? I'd browse the manual looking for fine print. The idea you are looking for is that after a survey it will save the location. If it has a saved location on power up it will use it rather than do a new survey. The other question is why are you turning it on/off often enough for a survey to be annoying? That type of box works a lot better if left on all the time. -- 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] HP 58503A acurate UTC time
HP 58503A Hi Hal Good point, I don't want the display lighting my office up at night, hence I often turn it off. What I really need is the circuit of the front panel, then I could dim the display and leave in on 24/7 Thanks 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] HP 58503A acurate UTC time
From: Dave Cawley Timestep Dartmouth Tel: +44 (0) 1803 833366 Fax: +44 (0) 1803 839498 HP 58503A accurate UTC time I have the version with the display panel and also the SatStat50 software all working fine. The time on both the display and PC appears to be 16 seconds fast. I queried the leap second and it says correctly 16 seconds. The display reads : GPS hh:mm:ss a.. So how do I set it to read real time ? b.. And is there a way of dimming or tuning off the display ? c.. Finally, how do I stop it doing a survey every time ? I know this must be obvious, but right now to me it isn't ! Thanks 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] HP 58503A acurate UTC time
a.. So how do I set it to read real time ? Try :DIAG:GPS:UTC 1 b.. And is there a way of dimming or tuning off the display ? No software command, but you try adding a resistor or switch to the VFD power. c.. Finally, how do I stop it doing a survey every time ? Try :GPS:POS: ... /tvb - Original Message - From: Timestep informat...@time-step.com To: time-nuts@febo.com Sent: Tuesday, March 11, 2014 11:33 AM Subject: [time-nuts] HP 58503A acurate UTC time From: Dave Cawley Timestep Dartmouth Tel: +44 (0) 1803 833366 Fax: +44 (0) 1803 839498 HP 58503A accurate UTC time I have the version with the display panel and also the SatStat50 software all working fine. The time on both the display and PC appears to be 16 seconds fast. I queried the leap second and it says correctly 16 seconds. The display reads : GPS hh:mm:ss a.. So how do I set it to read real time ? b.. And is there a way of dimming or tuning off the display ? c.. Finally, how do I stop it doing a survey every time ? I know this must be obvious, but right now to me it isn't ! Thanks 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] HP 58503A acurate UTC time
a.. So how do I set it to read real time ? My notes say that for a Z3801A: :diag:gps:utc 1 It may need a reboot. A google search for HP 58503A manual gets lots of hits that look interesting. This is the top of the list: 58503B GPS Time and Frequency Reference ... - LeapSecond.com www.leapsecond.com/museum/hp58503a/097-58503-13-iss-1.pdf -- 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.
[time-nuts] Hp 58503A
Hey guys, new to the group here and wanted to throw a question out there. I just picked up an HP 58503A and hooked it all up. I have it connected to my computer and I can see the system status via satstat and all looks to be working correctly. However, I notice that there is distortion on the 10 meg sine wave on the 10 meg out on the back. This distortion consists of a slightly mis-shapen negative peak. The positive peak it normal. The unit has now been on for 15 hours and no change. It is locked to gps. The 10 meg out directly from the back of the XTAL is a perfectly normal sine wave. The question: is this a problem with my unit? Is this normal? And, how can I fix it. Thanks fellas, Mark. Sent from my iPad ___ 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 58503A
Mark, Are you loading the 10Mhz output with 50 Ohms when you measure it? Said Sent from my iPad On Oct 16, 2012, at 6:52, Mark Danon mdan...@gmail.com wrote: Hey guys, new to the group here and wanted to throw a question out there. I just picked up an HP 58503A and hooked it all up. I have it connected to my computer and I can see the system status via satstat and all looks to be working correctly. However, I notice that there is distortion on the 10 meg sine wave on the 10 meg out on the back. This distortion consists of a slightlymis-shapen negative peak. The positive peak it normal. The unit has now been on for 15 hours and no change. It is locked to gps. The 10 meg out directly from the back of the XTAL is a perfectly normal sine wave. The question: is this a problem with my unit? Is this normal? And, how can I fix it. Thanks fellas, Mark. Sent from my iPad ___ 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 58503A
I guess this it what they would call a rookie move? WOW, i feel like an idiot. I just loaded it down with a 50 ohm load and looks perfect. Thanks for enlightening me. ___ 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 58503A
I overlooked it also. Glad the problem is resolved. Thomas Knox Date: Tue, 16 Oct 2012 12:31:13 -0400 From: mdan...@gmail.com To: time-nuts@febo.com Subject: Re: [time-nuts] Hp 58503A I guess this it what they would call a rookie move? WOW, i feel like an idiot. I just loaded it down with a 50 ohm load and looks perfect. Thanks for enlightening me. ___ 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 58503A
No problem, happens to me too some times, usually the 10MHz Sine should be loaded with 50 Ohms, and the CMOS/TTL 1PPS pulses should be run open-ended (1M or higher).. I say usually.. because there are cases where proper termination is critical such as LVDS 1PPS outputs.. and where the 10MHz does not necessarily need to be loaded with 50 Ohms, resulting in a higher sine wave voltage - such as on our JLT GPSDO products.. bye, Said In a message dated 10/16/2012 09:36:25 Pacific Daylight Time, mdan...@gmail.com writes: I guess this it what they would call a rookie move? WOW, i feel like an idiot. I just loaded it down with a 50 ohm load and looks perfect. Thanks for enlightening me. ___ 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 58503A
I just loaded it down with a 50 ohm load and looks perfect. One of my design pet peeves is not anticipating what users may do. For example, not anticipating that someone might terminate an output in a high impedance rather than in the rated impedance, or leave unused outputs unterminated. I have seen several multichannel isolation amplifiers where any output not terminated in 50 ohms is in hard clipping -- even with halfway decent isolation, this can put garbage on the other outputs. The very definition of an isolation amplifier is that each output should be independent of how the other outputs are terminated -- short, open, inductor, capacitor, other signal, whatever. I understand it is not trivial to provide 1 Vrms (+13 dBm) outputs with 6 dB overhead from a 5 V (or 3.3 V) supply, but that's why they pay designers the big bucks. Best regards, 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.
Re: [time-nuts] HP 58503A
Peter Bell bell.peter@... writes: If it is, then you should see a pulse every 2 seconds, lined up with the even seconds in GPS time. This might seem a rather strange signal to provide, but it's what the IS-95 derived CDMA systems use to trigger the start of another 100 block signalling frame. It also tends to suggest that the unit you have was originally being used as part of a CDMA system. Regards, Pete Hi Pete, I snapped on the osci probe and see no 1 PPS or 2 PPS signal. It seems like a noise signal with several positive and negative spikes with an peak to peak value of 50 to 60 mV... disapointing... Next is to analyze the rest with a logicprobe but the signal level seems to be too small for beeing a logic signal... TTL should be at 15 V, CMOS 5 V... but 50 mV ? Chris ___ 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 58503A
I ran into a wiki description of GPS using WGS84 a couple days ago. It included a mention of ESEC and it was something like: Earth Static, Earth Centric. I think I was following a link about the Z3801A. It referred to the fact that lat-lon is referenced to a static grid on the Earth and doesn't change as the Earth rotates on its axis or around the sun. Earth static and Earth centric. 73, Doug Reed, N0NAS. Christoph Kopetzky wrote: But now I am cleaning my devices and I am reading the label ESEC again on the back. So the question comes up again, what is ESEC? Google knows nothing about the signal or protocol... ___ 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 58503A
On 8/2/12 6:24 PM, Doug Reed wrote: I ran into a wiki description of GPS using WGS84 a couple days ago. It included a mention of ESEC and it was something like: Earth Static, Earth Centric. I think I was following a link about the Z3801A. It referred to the fact that lat-lon is referenced to a static grid on the Earth and doesn't change as the Earth rotates on its axis or around the sun. Earth static and Earth centric. Earth Centered Inertial - ECI centered on the earth, doesn't rotate with earth - very popular with earth orbiting satellites, because their center of rotation is at the center of the earth but their orbital plane is fixed in celestial terms. like RA/Decl Earth Centered Earth Fixed - ECEF (or ECF) centered on earth, rotates with earth. More like conventional lat/lon. ___ 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 58503A
Doug, I ran into a wiki description of GPS using WGS84 a couple days ago. It included a mention of ESEC and it was something like: Earth Static, Earth Centric. I think I was following a link about the Z3801A. It referred to the fact that lat-lon is referenced to a static grid on the Earth and doesn't change as the Earth rotates on its axis or around the sun. Earth static and Earth centric. That reference frame is called Earth Centered Earth Fixed (ECEF). And that is what GPS is using internally. However it is not lat/lon/h, but cartesian with origo in the earth center, xy in the equatorial plane and z pointing towards the north pole. http://en.wikipedia.org/wiki/ECEF -- Björn ___ 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 58503A
What 'scope are you using (brand and model)? TLL is 5V, CMOS 4000 series can be 15V but runs starting at 3V. Set the scope vertical (channel 1) at 1V/div (probe at 10:1), use NORMAL for the trigger and set the trigger (for the channel 1) *slowly* from 0V to +200mV (assuming that the trigger isn't aware of the 10:1) trying to follow the trigger indicator or the trace appearing on the screen. On Fri, Aug 3, 2012 at 3:31 PM, b...@lysator.liu.se wrote: Doug, I ran into a wiki description of GPS using WGS84 a couple days ago. It included a mention of ESEC and it was something like: Earth Static, Earth Centric. I think I was following a link about the Z3801A. It referred to the fact that lat-lon is referenced to a static grid on the Earth and doesn't change as the Earth rotates on its axis or around the sun. Earth static and Earth centric. That reference frame is called Earth Centered Earth Fixed (ECEF). And that is what GPS is using internally. However it is not lat/lon/h, but cartesian with origo in the earth center, xy in the equatorial plane and z pointing towards the north pole. http://en.wikipedia.org/wiki/ECEF -- Björn ___ 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 58503A
Azelio Boriani azelio.boriani@... writes: What 'scope are you using (brand and model)? TLL is 5V, CMOS 4000 series can be 15V but runs starting at 3V. Set the scope vertical (channel 1) at 1V/div (probe at 10:1), use NORMAL for the trigger and set the trigger (for the channel 1) *slowly* from 0V to +200mV (assuming that the trigger isn't aware of the 10:1) trying to follow the trigger indicator or the trace appearing on the screen. On Fri, Aug 3, 2012 at 3:31 PM, bg@... wrote: Azelio, I tried my two HAMEG Scopes for this job, a digital variant HMO3524 and my analog HM2005-2 scope... I am quite familiar with scope measurements :-) so there are definitely no PPS signals on the output... Chris ___ 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 58503A
Hal Murray hmurray@... writes: We discussed this area a week or three ago. You don't need a digital scope to determine if there is a pulse. A digital scope may help to see the pulse and figure out what it looks like. With an analog scope, you can either look at the blinking light that tells you it's triggering, or you can reduce the sweep speed until you can easily see the (flat) line from the beam each time it triggers. I can see a 10 microsecond pulse with my old Tek 465. It blinks and I roughly remember what the picture looks like. If I want to know a detail, I have to look at the right spot and wait for the next pulse. Hi Hal, with my analog scope (Hameg HM2005-2) I can trigger a low level voltage spike signal with a p-p voltage of 30 mV and a frequency of 52,6 kHz. Could that be real? The signal level is very low, 30 mV... Chris ___ 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 58503A
Doug Reed n0nas@... writes: I ran into a wiki description of GPS using WGS84 a couple days ago. It included a mention of ESEC and it was something like: Earth Static, Earth Centric. I think I was following a link about the Z3801A. It referred to the fact that lat-lon is referenced to a static grid on the Earth and doesn't change as the Earth rotates on its axis or around the sun. Earth static and Earth centric. 73, Doug Reed, N0NAS. Hi Doug, do you have more infos about the signal type of that Earth static, Earth centric? is it a digital or analog signal? Thanks Chris ___ 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 58503A
Here: www.leap*second*.com/museum/*hp58503*a/097-58503-12-iss-1.pdf you can find that there is the option 002 for the even second but they call it PP2S... Try to discover if your 58503 has this option 002. On Fri, Aug 3, 2012 at 5:09 PM, Christoph Kopetzky dekag...@gmail.comwrote: Hal Murray hmurray@... writes: We discussed this area a week or three ago. You don't need a digital scope to determine if there is a pulse. A digital scope may help to see the pulse and figure out what it looks like. With an analog scope, you can either look at the blinking light that tells you it's triggering, or you can reduce the sweep speed until you can easily see the (flat) line from the beam each time it triggers. I can see a 10 microsecond pulse with my old Tek 465. It blinks and I roughly remember what the picture looks like. If I want to know a detail, I have to look at the right spot and wait for the next pulse. Hi Hal, with my analog scope (Hameg HM2005-2) I can trigger a low level voltage spike signal with a p-p voltage of 30 mV and a frequency of 52,6 kHz. Could that be real? The signal level is very low, 30 mV... Chris ___ 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 58503A
OK, that's what I get for working from memory. :-) I got the idea more or less right but it has nothing to do with the abbreviation under discussion Thanks for the correction. 73, Doug. b...@lysator.liu.se wrote: Doug, I ran into a wiki description of GPS using WGS84 a couple days ago. It included a mention of ESEC and it was something like: Earth Static, Earth Centric. I think I was following a link about the Z3801A. It referred to the fact that lat-lon is referenced to a static grid on the Earth and doesn't change as the Earth rotates on its axis or around the sun. Earth static and Earth centric. That reference frame is called Earth Centered Earth Fixed (ECEF). And that is what GPS is using internally. However it is not lat/lon/h, but cartesian with origo in the earth center, xy in the equatorial plane and z pointing towards the north pole. http://en.wikipedia.org/wiki/ECEF -- Björn ___ 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 58503A
Azelio Boriani azelio.boriani@... writes: Here: www.leap*second*.com/museum/*hp58503*a/097-58503-12-iss-1.pdf you can find that there is the option 002 for the even second but they call it PP2S... Try to discover if your 58503 has this option 002. Azelio, thanks for the link but I already know this manual. And for remembering I was talking about my 58503A Receiver. This receiver do not have a PP2S Output. Only the TTL Alarm and the ESEC (?) And as I wrote in my posting above, I only can see with my analog scope a little periodic signal with a level of approximately 28-30 mV and a triggered frequency of 56,3 kHz at a timebase setting of 5µs/div. If I am changing my timebase to 10µs/div and measuring the frequency I am getting 65,4 kHz. This is a little bit confusing and seems to be reasoned from the little signal level... So now I am more curious what signal the ESEC seems to be ___ 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 58503A
Hello followers, I can state that my measuring of the signal (30 mV, 65,2 kHz) was caused by the serial line of the com port of the receiver... :-) After looking for sources of the noisy signal I disconnected my first the GPS antenna signal from the 58512A GPS amplifier. - Signal intact Then I disconnect my frequency meter from the 10 MHz output - signal intact Now I disconnected the serial connection to my notebook - signal gone! So it was an interspersed signal from the serial connector ... But at the end the question what the ESEC output may be is still mysterious... Chris ___ 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 58503A
dekag...@gmail.com said: with my analog scope (Hameg HM2005-2) I can trigger a low level voltage spike signal with a p-p voltage of 30 mV and a frequency of 52,6 kHz. Could that be real? The signal level is very low, 30 mV... That sounds like junk pickup. My guess would be from a switching power supply. Any real signal that I've seen is at least several volts. -- 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] HP 58503A
Hal Murray hmurray@... writes: dekagoon@... said: with my analog scope (Hameg HM2005-2) I can trigger a low level voltage spike signal with a p-p voltage of 30 mV and a frequency of 52,6 kHz. Could that be real? The signal level is very low, 30 mV... That sounds like junk pickup. My guess would be from a switching power supply. Any real signal that I've seen is at least several volts. Hal, you are very right, in the meantime I found that the junk came over the serial connection from my notebook to the 58503A... Regards Chris ___ 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 58503A
Azelio Boriani azelio.boriani@... writes: Why are you assuming this is a protocol or signal label? Maybe a maintenance or repair-by-exchange indication too. Because the label is above the bnc connector on the back side of the 58503A beside the bnc connector with an alarm label. The 58503A has the single option H14. May be this is a special output protocol on this connector like the IRIG protocol... Any ideas? Chris ___ 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 58503A
OK, it is in the place of the PPS output... can you hook an oscilloscope and see if there is any output? On Thu, Aug 2, 2012 at 10:25 AM, Christoph Kopetzky dekag...@gmail.comwrote: Azelio Boriani azelio.boriani@... writes: Why are you assuming this is a protocol or signal label? Maybe a maintenance or repair-by-exchange indication too. Because the label is above the bnc connector on the back side of the 58503A beside the bnc connector with an alarm label. The 58503A has the single option H14. May be this is a special output protocol on this connector like the IRIG protocol... Any ideas? Chris ___ 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 58503A
My guess is that it's a PP2S / Even Second output - that would also match with the label... On Thu, Aug 2, 2012 at 5:02 PM, Azelio Boriani azelio.bori...@screen.itwrote: OK, it is in the place of the PPS output... can you hook an oscilloscope and see if there is any output? On Thu, Aug 2, 2012 at 10:25 AM, Christoph Kopetzky dekag...@gmail.com wrote: Azelio Boriani azelio.boriani@... writes: Why are you assuming this is a protocol or signal label? Maybe a maintenance or repair-by-exchange indication too. Because the label is above the bnc connector on the back side of the 58503A beside the bnc connector with an alarm label. The 58503A has the single option H14. May be this is a special output protocol on this connector like the IRIG protocol... Any ideas? Chris ___ 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 58503A
OK, so a digital 'scope is needed or, at least, with memory. On Thu, Aug 2, 2012 at 1:12 PM, Peter Bell bell.pe...@gmail.com wrote: My guess is that it's a PP2S / Even Second output - that would also match with the label... On Thu, Aug 2, 2012 at 5:02 PM, Azelio Boriani azelio.bori...@screen.it wrote: OK, it is in the place of the PPS output... can you hook an oscilloscope and see if there is any output? On Thu, Aug 2, 2012 at 10:25 AM, Christoph Kopetzky dekag...@gmail.com wrote: Azelio Boriani azelio.boriani@... writes: Why are you assuming this is a protocol or signal label? Maybe a maintenance or repair-by-exchange indication too. Because the label is above the bnc connector on the back side of the 58503A beside the bnc connector with an alarm label. The 58503A has the single option H14. May be this is a special output protocol on this connector like the IRIG protocol... Any ideas? Chris ___ 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 58503A
Azelio Boriani azelio.boriani@... writes: OK, so a digital 'scope is needed or, at least, with memory. On Thu, Aug 2, 2012 at 1:12 PM, Peter Bell bell.peter@... wrote: My guess is that it's a PP2S / Even Second output - that would also match with the label... OK Azelio, good idea, I will check that if I am back in the lab... EverySECond... makes sense because the ESEC label really is over the original PPS labeling.. I will keep you up-to-date! Thanks for the answers! Chris ___ 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 58503A
If it is, then you should see a pulse every 2 seconds, lined up with the even seconds in GPS time. This might seem a rather strange signal to provide, but it's what the IS-95 derived CDMA systems use to trigger the start of another 100 block signalling frame. It also tends to suggest that the unit you have was originally being used as part of a CDMA system. Regards, Pete On Thu, Aug 2, 2012 at 8:00 PM, Christoph Kopetzky dekag...@gmail.comwrote: Azelio Boriani azelio.boriani@... writes: OK, so a digital 'scope is needed or, at least, with memory. On Thu, Aug 2, 2012 at 1:12 PM, Peter Bell bell.peter@... wrote: My guess is that it's a PP2S / Even Second output - that would also match with the label... OK Azelio, good idea, I will check that if I am back in the lab... EverySECond... makes sense because the ESEC label really is over the original PPS labeling.. I will keep you up-to-date! Thanks for the answers! Chris ___ 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 58503A
My guess is that it's a PP2S / Even Second output - that would also match with the label... azelio.bori...@screen.it said: OK, so a digital 'scope is needed or, at least, with memory. We discussed this area a week or three ago. You don't need a digital scope to determine if there is a pulse. A digital scope may help to see the pulse and figure out what it looks like. With an analog scope, you can either look at the blinking light that tells you it's triggering, or you can reduce the sweep speed until you can easily see the (flat) line from the beam each time it triggers. I can see a 10 microsecond pulse with my old Tek 465. It blinks and I roughly remember what the picture looks like. If I want to know a detail, I have to look at the right spot and wait for the next pulse. -- 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.
[time-nuts] HP 58503A
Hi all, I have a question on my 58503A: no problems aside, it is running for several years without any problems. But now I am cleaning my devices and I am reading the label ESEC again on the back. So the question comes up again, what is ESEC? Google knows nothing about the signal or protocol... I am now curious again and finally want to know what is ESEC? Hope someone can illuminate me with this question. Best regards and thanks in advance ;-) Chris ___ 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 58503A
Why are you assuming this is a protocol or signal label? Maybe a maintenance or repair-by-exchange indication too. On Wed, Aug 1, 2012 at 11:40 PM, Christoph Kopetzky dekag...@gmail.comwrote: Hi all, I have a question on my 58503A: no problems aside, it is running for several years without any problems. But now I am cleaning my devices and I am reading the label ESEC again on the back. So the question comes up again, what is ESEC? Google knows nothing about the signal or protocol... I am now curious again and finally want to know what is ESEC? Hope someone can illuminate me with this question. Best regards and thanks in advance ;-) Chris ___ 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 58503A Dim Display Replacement
Hi Jeff, The VFD module is identical to the ones used in the 53131A and 53132A counters. It is a part of the A2 input assembly in the counters (p/n 53131-60002). The good news is that Agilent still has 7 new and tested units in stock. The bad news is that the list price is $756.00. Even though all you really need is the actual glass VFD module, it's not available from Agilent as a separate part. Regards, Stan 2. HP 58503A Dim Display Replacement (jeffh...@comcast.net) Message: 2 Date: Wed, 25 Jul 2012 00:29:02 + (UTC) From: jeffh...@comcast.net To: time-nuts@febo.com Subject: [time-nuts] HP 58503A Dim Display Replacement Message-ID: 1924087406.102486.1343176142270.javamail.r...@sz0079a.emeryville.ca.mail.co mcast.net Content-Type: text/plain; charset=utf-8 Hi, I have an older HP 58 503A with option 001 display but it is very dim from age. Does anyone know of a replacement display IC for this? Thanks Jeff ___ 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 58503A Dim Display Replacement
Hi; If you can find a part number for the VFD only you may be able to purchase them, but you would need a part number. In the recent past have purchased 3458A VFD displays alone with the part number for about $100ea , but I believe if you ask parts ID they will tell you that 3458A VFD are not available separately. Agilent is really good compared to some companies but in some cases it really depends on who you talk to. Sometimes you can go directly to the display manufacturer. Let us know if you find a source for the VFD. Best Wishes; Thomas From: swp...@earthlink.net To: time-nuts@febo.com Date: Wed, 25 Jul 2012 17:37:52 -0700 Subject: Re: [time-nuts] HP 58503A Dim Display Replacement Hi Jeff, The VFD module is identical to the ones used in the 53131A and 53132A counters. It is a part of the A2 input assembly in the counters (p/n 53131-60002). The good news is that Agilent still has 7 new and tested units in stock. The bad news is that the list price is $756.00. Even though all you really need is the actual glass VFD module, it's not available from Agilent as a separate part. Regards, Stan 2. HP 58503A Dim Display Replacement (jeffh...@comcast.net) Message: 2 Date: Wed, 25 Jul 2012 00:29:02 + (UTC) From: jeffh...@comcast.net To: time-nuts@febo.com Subject: [time-nuts] HP 58503A Dim Display Replacement Message-ID: 1924087406.102486.1343176142270.javamail.r...@sz0079a.emeryville.ca.mail.co mcast.net Content-Type: text/plain; charset=utf-8 Hi, I have an older HP 58 503A with option 001 display but it is very dim from age. Does anyone know of a replacement display IC for this? Thanks Jeff ___ 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 58503A Dim Display Replacement
Hi, I have an older HP 58 503A with option 001 display but it is very dim from age. Does anyone know of a replacement display IC for this? Thanks Jeff ___ 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.
