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Hi can someone tell me what thread the screws are that hold the back panel on HP8656. I am assuming they are 5/32 as 3mm and 4mm metric are either too small or too big. or wrong thread Are the UNF , UNC or something else? imperial thread screws are not common in Australia, and I have lost all teh screws out of the back of my sig gen. I think the ones i ordered were bsw and of course don't fit Wayne VK2WDE

HP series 200/300 and Plotter Manuals PM direct for offer… 7470A Plotter, Statistics, Graphic Presentation, Project Management, Basic 4.0… Interface Techniques, Utilities, Waveform Analysis, Graphic Techniques, Asynchronous Terminal Emulator Thanks, Alan

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/3000 to 3999/33xx Level detectors and synthesizer level generators/3336 A-B-C Section VIII - Service.pdf By: Harold Foster <halfoster@...> Description: Combined schematics and diagrams for the "Section VIII - Service" portion of the 3336A-900000 manual

Radu Bogdan Dicher <vondicher@...> added the photo album Microscope

I might be able to get an HP 8511A...

Went to great lengths to create PyVISA program to read using the GPIB the x4 parameter S-parameter data from the HP8510C. This eventually would read consecutive 1701 point sweeps in a round 5 seconds using the HP binary data format; ASCII data formate took much longer. That was for uncalibrated data. However, when i tried to read TRL calibrated data it would take over two minutes to read the data. The obvious solution then would be to just read the uncalibrated data and perform the TRL calibration in the PC. I could trawl through endless papers to find a suitable mathematical equations to code up in Python. From what i gather, mathematically its quite complicated, solving something like 12 simultaneous equation, clearly doable, but i've also got a massive list of other stuff to do. Might anyone have an algorithm to perfor the TRL calibration, or know where i might find this? many thanks, N

Hello Forum, I think I posted this before but no harm in bumping... Together with an HP8568B, I got a number of 3?-inch disks: 85863-10027 Rev C : 85863A Opt 630 Basic Software Library 08568-10004 Rev A: HP 8568B Spectrum Analyzer Operation Verification 08568-10004 Rev A: BASIC Operation Verification for 8568B 85863-10027 Rev B: 85863A Basic Software Library for 8566A and 8568A Opt 630. All disks (C) 1984 and two of them marked "For HP 9000 Series 200 Computers with Basic 2.0 or 3.0 O/S Any interest in images? I do not know if any data remains on them. If so, How to read and make images on a PC running XP or W7? Cheers Ulf Kylenfall SM6GXV

My 8643 failure message indicated 5V supply failure. Voltage at test point measured 4.9 volts. I replaced all the capacitors in both switching supplies of the 8643A. Both supplies checked out OK before capacitor changes, and OK after capacitor changes. But I'm happy it has new capacitors. The battery voltage was OK, but being old and not interested in leaks, it has a new set of 3xAAA in little plastic holder. After reading about tinned Molex connectors developing voltage drops I sprayed DeOxit on pins of the power supply connector, and both input and output connectors of the power filter board. And of course the cable pins that plugged into those connectors. Power supply and filter board input connectors were tinned pins. Pins on the output end of the filter board were gold. Did the best I could, but it wasn't as good a job as I would like to have done. NONE of the connector bodies were discolored. There was maybe 1/4 volt drop, and not that many hours of use, before I took it apart. Probably not enough time and heat to discolor the Nylon. Applied power, and test point now measures 5.10 volts. So looks like it was voltage drop in the tinned Molex connectors. No error message. While I haven't checked exhaustively to verify everything is working, but I expect it's OK again. THANK YOU GUYS FOR POINTING TO THE CONNECTORS Regards - Bill W7AAZ

My 8643A started doing a "recalibrate" every time I turned it on. Once the 8643A completes that "recalibrate" its RF output and frequency are OK, although I have not tested every aspect of modulation, sweep, etc. I assumed it was failure of the memory backup battery, but it was original and OK. But old and leakage would be a disaster, so replaced the battery with three AAA NiCad. Still "recalibrated", as expected. The fault message at the end reported the 5.25V supply was not within spec. I checked a test point at the output of the power supply filter board and found less than 5.0V. Having experience with tired computer grade capacitors I assumed that would be the case here. Surprise: no transformer supply with big caps, just two switchers. I pulled both switching supplies and found that both the oven switcher and the main 5V/15V supplies voltages were OK. Particularly the 5.25 I tested with a 2A load current and it was perfect. All capacitors in both supplies with Nichicon 105C and operating at a fraction of rated voltage. Nonetheless, considering the age and the disassembled state of the 8643A I have all new capacitors (again Nichicon 105C which were also my choice when I was working). I have replaced caps and retested the 24V oven switcher. The last capacitor for the main switcher is supposed to arrive today and I expect the main supply will test OK by tonight. Out of curiosity I tested the removed capacitors and all but one exceeded the rated capacitance and had tiny leakage current. It appears I am losing about 300mV between a supply at 5.25 volts and the connector at the output of the power-filter board. Something drawing too much current? It would have to be a seriously large amount of current. That seems unlikely given that it seems to be working. All DC supplies pass through a passive filter board with series inductors, shunt capacitors. With the supplies still out and the filter output connector disconnected, I will measure the shunt impedance of that filter board. Anyone with 8643A experience have any other ideas? Bill On 3/7/2025 7:51 AM, AArnaud via groups.io wrote:

Hi there, I'm trying to generate the calkit file CK_ programmatically instead of punching them in various GUI based CalKit manager. Basically, I'm doing my homemade open and slot standards and characterize them to use as poor man's Calkit for non-critical measurement to reduce the wear and tear on my expensive Cal Kit. Manually entering the polynomials and class assignments in the VNA CalKit manager is very slow and painful. I'm trying to generate it a C program so that I can send it to my 8510 either by GPIB or floppy disk but I can't find the format of the 8510 CK_ file. Does anyone know? Regards, Calvin

Hello, Is Artek manuals still alive? I've sent two requests for manuals by email, one in February and another in March and have yet to receive a reply (or a failure to deliver notification) to either one. Regards, Waz

Hi, Does anyone know what happened to the website for the HP 4192a sweep utility written by Michael Kelzenberg? I didn't have it bookmarked so don't recall the URL, I think it was on a university website. It's completely disappeared from search results online. I luckily have a copy of the installer I downloaded in November, but someone else asked me where I got it and I can't find it anymore. It would also be nice to have a copy of the text of the site for reference. Thanks! BTW, the file name of the installer is "Install-4192A-V1-full.exe". Even that doesn't show in any search results. Thanks

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