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The following items have been added to the Files area of the [email protected] group. /All HP, Agilent and Keysight instruments in folders by part numbers/4000 to 4999/4192A LF Impedance Analyzer (5 Hz - 13 MHz)/Sweep utilities written by Michael Kelzenberg/Install-4192A-V1-light.exe By: Yves Tardif <yves_tardif@...> Description: 4192A Sweep Utility https://web.archive.org/web/20190606111327/http://mkelzenb.caltech.edu/software/4192A https://web.archive.org/web/20190906232315/http://mkelzenb.caltech.edu/software/4192A/4192A_help_web.html

My 3586A E3.1 repair: Many thanks to Didier (#1759)for his spot on suggestion as to the fix for the 3.1 error on my 3586A. One difference: My VCXO oscillator was oscillating amplitude wise OK, but had drifted low in frequency. Others may benefit from my particular fix, different from Didiers, so here goes. With 3586A and measuring instruments warmed up 4 hours from cold at 20 deg C room temp:- Instrumentation used: HP34401A DMM, HP5316A Freq Cntr (with opt 001,but external frequency in at rear fed from HP3586A HI STAB TCXO 10MHz out). Systron Donner DL40 dual PSU fed in turn to 50k 10 turn Helipot, bridge connected with center arm providing a variable external + / - Vco via screened leads, +/- 8.6v, adjusted in 1.000v increments as monitored on DMM. A small pi section RF filter with a 100Hz LC `trap' section was used in series with Vco leads into A11 to reduce any outside interference. (50Hz line frequency over here). The above instruments were in turn fed from an Advance CVN250A AC regulator, waveform corrected 3586 Adjustments (A11 board): Adjusting the slug outwards in L22 did not quite pull the XTAL enough to lock, but unsoldering the XTAL case to its ground post and lifting it up clear of the ground plane beneath did the trick here. The reduction in XTAL case capacitance to deck raised its freq enough in this case and no other changes to components were needed. Before this fix my VCXO had resistor R27 lifted and an external voltage fed to the cold end to check for frequency swing: At 0.000 v Y20 (XTAL) frequency was 49.982775 Mhz, some 1600Hz lower than it should have been I measured a total deviation in Y20 frequency of from 2775Hz change (+8.600 v in) to 3989Hz change for – 8.600 v in.) After Xtal case lifted off ground and slug at minimum insertion, (the now correctly locked case) total deviation for the same external Vco inputs was: 1339 Hz change for +8.600 v in and 1772 Hz change for – 8.600 v in or a total excursion of 3,111 Hz from the XTALs center frequency With R27 re connected and external Vco removed, test point TP1 now indicated a correctly locked frequency of 49.984375 MHz as indicated on my 5316A counter. Note that my total frequency excursion is near the same as the 3kHz Didier experienced after adding extra C to Q22 on his unit. So this value may well be close to HP's original specification as the only circuit modification to mine was lifting the ground of the XTAL case. As this is a relatively simple mod to make, others may find the same in their case, avoiding changes or additions at the component level. Again, many thanks to Didier for pointing out the area to check, allowing my 3586A to work as it should (a lot less annoying whistles and a normal dB readout of signals received at last!)… and for the much appreciated downloaded details of the 3586A, a truly magnificent piece of instrumentation and a tribute to HP's designers ! JBEE (John Byers)

My garage lab computer went kaput recently, and I need to get another one to control my instruments via GPIB and USB. I had a tower running Windows 7, although it was originally my wife’s computer running (ick!) Windows Vista. Sooooo slow! Anyway, I don’t need anything fancy, just a PCI slot for the GPIB card, Ethernet jack for Internet connection, and at least 4 USB jacks (kbd, mouse, USB microscope, GPSDO). Mini tower or thin client would be great. Anybody have a PC they don’t need? Thanks in advance. Jim Ford Laguna Hills, California, USA

I have an Agilent 34401A which I've used at my bench for many years. Today I went to measure a 12 volt battery and it just started clicking. I tried it on a power supply and auto ranging works fine up to 12 volts where it starts clicking about twice a second. Trying manual range, going over the 10 volt range shows exactly zero volts to any input. I am guessing it tries autoranging higher, sees the zero, then tries to go lower, then repeats. This is only on DC volts. AC volts and resistance (didn't check current) are fine, for example I can plug the leads into an outlet and it shows 120 VAC just fine. Before I dig in, is anyone familiar with this fault? Peter

Hi, i got a HP83752A sweeper and want to retrofit the Mechanical Attenuator Option (1E1). I have a matching Attenuator, but i'm wondering how to enable it. There's a Keysight Document telling how to do that for Option 1E5 (Internal 10MHz timebase), but none for 1E1. Does anyone know how to enable that Option? Also does someone have a CLIP for these units? I only found service guides without schematics. If anyone has the firmware update disks/images that would also be very helpful, than i could take a peek at the Firmware. Thanks! Sven

Santiago, I'm in roaming and have some problems with emails. Please send again Milan Vasic

Hi to the group new to this group I have an HP 8640b the frequency range switch has dropped some of its contacts and looking with the times 30 loop on the plastic discs it looks like I'm missing a couple of contacts that I could not find inside the chassis anybody have any information on how many contacts on each of the three discs that are inside that machine appreciate any help thank you

I have several of the HP 5245L counters and until recently, had at least one working. Now it seems that the last “working” counter I own has gone belly up. Two of them have the same problem, (the gate indicator isn’t flashing and one of the two isn't counting). I have the manual and it gives some trouble shooting points to check but in some cases, it only states there is a problem with a board instead of providing a list of components that could be faulty. This appears to be a common problem, at least with two of mine. It may be common enough for one of you experts to have fixed it and remembers what component failed. If so, I would greatly appreciate some help. Tom. N5AMA

Hello, I have a very nice 3457A which has a 40-year old battery. New batteries are quite inexpensive and easy to find, but I'm quite scared at the prospect of replacing the battery without first dumping the calibration data to a file, and having a way of reloading it if anything goes wrong during the replacement process. Someone already tackled the problem of storing the cal data on a PC (https://github.com/Niravk1997/HP3457A-Calibration-Dump-Utility-for-AR488-GPIB-Adapter) but I couldn't find anything about how to restore the data from the PC to the 3457A if the data is lost. Right now my 3457A is sitting there with a battery which is 40 years old, and counting ... Any help or pointer(s) would be sincerely appreciated ! Joel

Hi all, working on my 8656B sig gen, and managed to break the IDC Centronics connector , so the cable is no longer attached. Is there a suitable replacement available taht is not too ex[ensive. Have to replace teh mains socket as smoke came out, still waiting on that, and it cost over $86Aus from RS on its own.I don't want to spend more than the device is worth to fix it, not that I am likely to use this port Wayne VK2WDE

Does anyone happen to have specs on this little mixer from the 1970s? It was used in the HP8552A IF section. I have a bunch, and may be able to use them in a project, but it would be nice to have specs. All I know now is the pinout and an example application as in the 8552A. Ed

I have: 1975 1977 1990 1993 1994 1995 1996 1997 1998 1999 2000 2x 2001 2x 2005 Anritsu 1998 2000 2001 You may pick them up in San Mateo, CA. No shipping. All one lot for free, BUT you must take them all. Cheers John Pease

HP list, I have attempted to assist a current HP list member in Germany with boards from a 8660C. The Post Office is telling me they cannot ship electronics to Germany. (From the US). Parts, vintage, boards, doesn’t matter. Do I have the customs form filled out wrong? Anybody have a explanation or know how to get this done? I did try UPS, they quoted a price which is a significant percentage of my monthly income. Thanks for any ideas, explanation, Gary WA2OMY

Looking to purchase one. It shows no display on the screen which I can deal with, but I can't seem to find in the manual anything about the bottom Instr Check lights. The left one stays on. Any knowledge about what causes this? Thank you, Scott

The following items have been added to the Files area of the [email protected] group. /All HP, Agilent and Keysight instruments in folders by part numbers/8000 to 8999/8590 Spectrum Analyzer/8591E_PSU_5062-8229_Schematics/HP859x_PSU_Control_Overlay_A.pdf /All HP, Agilent and Keysight instruments in folders by part numbers/8000 to 8999/8590 Spectrum Analyzer/8591E_PSU_5062-8229_Schematics/HP859x_PSU_Control_Schematics_A.pdf /All HP, Agilent and Keysight instruments in folders by part numbers/8000 to 8999/8590 Spectrum Analyzer/8591E_PSU_5062-8229_Schematics/HP859x_PSU_OP_Regulator_Overlay_A1.pdf /All HP, Agilent and Keysight instruments in folders by part numbers/8000 to 8999/8590 Spectrum Analyzer/8591E_PSU_5062-8229_Schematics/HP859x_PSU_OP_Regulator_Schematics_A1.pdf /All HP, Agilent and Keysight instruments in folders by part numbers/8000 to 8999/8590 Spectrum Analyzer/8591E_PSU_5062-8229_Schematics/HP859x_PSU_Switching_Regulator_Overlay_A.pdf By: Chris Weir <chris.a.weir@...> Description: Full schematics and component overlays of all three PCBs created by circuit tracing. Specific Board Numbers are included on the schematics. These have been checked carefully, but it is likely that there are some errors. The circuits are intended to aid repair of these rather unreliable units.