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Keysight Forum
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Hello - Does anyone on this group use the Keysight Forum at https://community.keysight.com/forums/s/ ? I have had poor luck with it for the last few years. I have had no responses to inquiries about still in product test equipment. Prior to that, Keysight personal actually helped but no longer. Inquiries to the Keysight tech support contact webpage always results in "We're sorry, you don't have a contract so we don't want to help you". Even for basic and simple questions about features and so on. Thanks -- Whitham D. Reeve Anchorage, Alaska USA ---
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8753C VNA option upgrade
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Good day all, I hope this message finds you well. Apologies if this is not the correct method of sharing. This topic must have been discussed multiple times as well. If possible, I would like to ask if anyone might be able to assist with codes for the 8753C VNA. Firmware version 04.02 1988 Analyzer has no options installed but, I do have an 85047A test set that can be used for 006. If anyone is willing to assist, I would be extremely grateful.
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Free: Repaired 6GHz coupler for 8753D/E or 85047A
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Do you need a coupler to fix your network analyzer? I have a repaired 5087-6007 coupler which should fit the 8753D, E, ES or ET or the 85047A test set. It was presumably blown out with applied RF killing the 3 resistors in the broadband coupler. I replaced them with surface mount parts. Uncorrected performance does not meet the published specs, especially near the high end, but the coupler works fine with corrections on. Be aware that any unit with a blown coupler likely also had damage to the source switch. Sometimes that can be corrected by removing the protection diodes in the switch: They tend to go shorted when overloaded, saving the rest of the circuitry in the switch. The coupler is free for pickup in the Los Angeles area, or I can send it to a USA destination by USPS. For those interested in the history of this coupler design, attached is an article by Joel Dunsmore describing how the coupler works. Contact me directly if interested: johngord (at) verizon (dot) net --John Gord
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Has anyone investigated the ENR and ENR uncertainty of the HP 346A noise source at frequencies below 10 MHz? Same question for the HP 346B? If so, what was found? Thanks! -- Whitham D. Reeve Anchorage, Alaska USA ---
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I have a job that requires removing a 56 pin PCB connector from an HP 6 (or so) layer motherboard. I'm considering the Hakkp FR301 desoldering tool - if anyone has experience using this tool for a similar job, I'd like to hear about it. In particular is it capable of supplying adequate heat for a job like this. If you have experience, please speak up! Cheers! Bruce
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Searching parts for HP 5370B
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Hello to all members. I need mechanical parts to repair my HP 5370B. Sadly the parts list in the service manual I found on the web is not too good, so I don't know the part numbers. - display filter - front panel frame Please PM if you have these parts available. Thank you ! Claude VA2 HDD
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8596E Spectrum Analyzer Fault
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Hi guys, In the course of investigating some IFTs today, I fired up my 8596E, which started-up normally and displayed the usual min thru ~12Ghz spectrum. However, when I tried to enter the frequency range I wanted to study, it froze up and just would not respond. I was able to enter the start frequency okay, but the very second I entered the stop one, it just locked-up and became super-sluggish and unresponsive to any further input. At the instant, I got a "FREQ UNCAL" message appear on the screen. A *possible* clue is the 'OVEN' message takes a lot longer to go away than it has previously when it was all working fine. However, even when fully warmed up, I am still experiencing the thing freezing-up as described above. Any ideas what the fault might be? Cheers, Jinxie
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Accurately measuring 1000pF and 100pF capacitors, to calibrate 4276A?
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I've recently been tweaking my 4276A LCZ meter, and I am now at the point of needing 100pF and 1000pF capacitor standards. All the rest of the things are easy, I can measure resistors etc to sufficient digits, but the capacitors I'm less sure about. Does anyone have a good suggestion on how to measure capacitors accurately, assuming I have a full complement of test gear, but no reliable direct capacitance measurement gear beyond my 34461A multimeter in capacitance mode or my Der EE DE-5000 LCR meter? (I also have a 4263B LCR meter, but it is unknown regarding calibration and adjustment, and will have to remain so until I find a copy of the adjustment software, or reverse engineer it myself...) The 4276A calls for 100pF and 1000pF for adjustment procedures, and 1pF, 10pF, 100pF and 1000pF for performance verification, all calibrated to 0.01% accuracy at 1kHz and within 0.1% of their nominal values. I have made a bunch of 4-wire kelvin BNC adapter PCB's that attach directly to the instrument's BNC connectors, which work excellently for the open, short, and resistance values, so I can easily use them for the capacitors too. Maybe polystyrene or mica are a reasonable choice? Any tips and help would be greatly appreciated. Thanks! Jared
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CRT unit for 8593A compatible
I have a 8593A with a display problem. There is a spare offered, HP 2090-0514 "for 859x E" question here: is this full compatible and useful in my 8593A? thank you
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HP54502A Oscilloscope fail A/D test and cal
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Hi. Glad to join this group. I have a HP54502A in fairly good condition I want to fix for my workbench. It fails on A/D test (pass D/A and rest) on CHANNEL 2 only. I have no schematics, just the SM, and if anyone knows of link to any it would be appreciated. Anyway, have anyone else successfully fixed this error before and what was it? I did see a blog online with at short in PS but ALL voltages seems OK and 5.2 adjusted according to SM. I have swapped the 2 ICs with heatsink around just to eliminate that. In lack of a schematics does anyone knows which IC is the DAC (A/D converter) so I at least can have a look around it and compare channels (CH 1 works perfect). Any hints are welcomed......... PS. the Dallas chips has been replaced before I got the scope with a DS1230Y so guess that is not the reason? I got the schematics for a 54601a is that too far off or similar in chip sets used? Cheers
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Subject line says it all - expected coverage is 2-18 GHz but no other data can be found.
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Vintage parts for sale
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Hi, I am closing down my father’s long-standing workshop, which specialized in tube and radio technology using components available in the 1970s and 1980s. There are hundreds of germanium diodes, transistors, ceramic tubular capacitors, styroflex capacitors and power resistors—both new and desoldered. There’s a large quantity of these components. If anyone is interested, I can send photos and a detailed description. Best Jurek
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HP141T solid state replacement for the neon reference.
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Guys, I have just built and tested 4 more units of the neon tube replacement for the 141T (BE19400013B), and they are listed on Ebay. If you wish to buy directly from me, I can be reached at m.bafaro@.... It is listed as item # 306099745539 on Ebay. Best wishes, Mike Bafaro WA9ZEO
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54003A success
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Thank to those who provided information I was able to successfully use 54003A input modules as 1 meg probe converter/extenders. For my company the current COTS device was used to allow remotely using scope probes (like the Tek HP probes) at a distance from the test equipment, which also happened to have 50 ohm inputs. However I also wanted this capability in my home lab and didn't want to spend a lot of money. The 54003A modules are available very inexpensively. With a small +/- 10 volt supply and soldering on a 50 ohm coax cable these modules will very nicely allow high impedance measurements with 50 ohm instruments like spectrum analyzers, up to 300 MHz or so. These can be had for under $30 shipped from the auction site. IMHO a very useful device to have hanging around the lab. Especially for the money. Peter
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If I can find a way to copy the contents of the disk I would be glad to upload or share the program. It is mentioned in a number of HP documents such 9018-06438-3 on using HPIB. So far I have not succeeded at making a copy using a USB floppy drive on a Windows 11 machine. Windows claims the disk is unformatted. I did try the disk management diskmgmt.msc but no luck. I do have a couple of older XP machines but they do not have floppy drives installed (just CD drives). Is this worth pursuing? Suggestions? Jim
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Hi guys, I'm having trouble removing this connector. I've slackened off collar 'B' anti-clockwise in the picture and it's free. Collar 'A' on the other hand, is immovable. It should slacken off and retreat back towards the 'port 1' sign when turned clockwise, but it's not. This whole assembly should really only be finger-tight, but even with an adjustable wrench on the flats of 'A' I cannot rotate it. I'm using as much force as I dare and fear damaging it if I go any harder, so something must be amiss here. I'm not sure if the flats of the brass part 'C' could be of any assistance here or not, but I'm pretty sure I've never had to do anything with this section to get the assembly off before. Any suggestions? Thanks, Jinx.
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Keysight U1242B Schematic
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Does anyone have a schematic for a Keysight U1242B meter? I am trying to troubleshoot an "Aerr" error. Thanks. Mark
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If you use a VNA to characterize devices such as IF transformers, crystal filters, or ceramic filters, normally you add series resistance to the 50 ohm VNA ports so that the device sees its design impedance, which is usually much higher. This lets you measure the true response, but the resistors will reduce the dynamic range. You can use matching transformers instead of resistors to avoid this, but you may not have what you need on hand. The transformers must have enough bandwidth not to affect the device response. I've written a little program that renormalizes the S-parameter reference impedance to whatever the device needs. This lets you make a 50 ohm measurement and then see how the device would respond had it been driven and loaded by the correct impedance. If you record all four S-parameters, the renormalization will undo the effects of improper filter source and load impedances even for devices that are not perfectly symmetrical (reversing them changes the response). However, the program assumes the proper renormalized impedance is the same for input and output. This is not true of some IF transformers, for example. The renormalization program is listed at the top of this page: http://ham-radio.com/k6sti/mu.htm See the bottom of the page for downloading instructions. Brian
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hp82906A HPIB printer NOS available
PM me direct for shipping info. Thanks, Alan
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Looking for 54300A operating and service manual
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Nothing on Keysight, no luck with a web search. I have the operating and programming manual but it doesn't help. What I'm really after is the pinout for the plug in modules as I would like to use them stand-alone. Peter
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Sat 8:39am
Sat 8:39am