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My quick knee-jerk without studying the schematic is, if it’s in the signal chain, you probably want a high-gain low-noise part like a BC556. If you only have a 2N3906, it would be okay for debug.

Hi All, I have been puzzling for a while but I'm not sure that I have got to the truth yet. I have a H-P 334A Distortion Analyzer which I put away a while ago and now I find that something is not

"...is it possible that although the input levels look fine on screen when in reality the analyzer is actually seeing higher than -30dB at it's input..." - Not only is it possible, it is very

If the signals are radiated then using cables and adapters with very good shielding can help mitigate the issues but if they are conducted than things become difficult!

There might be cases where a spectrum analyzer is used to measure a particular signal that is surrounded by many adjacent strong signals. Perhaps the signal measured isn't as strong as the adjacent

My 8640B came with trashed RANGE and DEVIATION knobs. Rather than hunt down spares, I cobbled my own. I took a generic knob and simply attached the old skirt to it. It looks wrong but works right.

"Lothar baier" <Lothar@...> writes: Interesting, thanks for sharing. I checked my own manuals. The one I purchased from Artek has the 2812A component level service manual for the 8340B,

Hello George, from 12,000 miles away. If only I had met you when I lived and worked in the UK. I have a couple of 8640Bs that I’ve managed to keep going – the odd capacitor failing, and those

Hi Ruben, sorry, for white/white-red wire, the AC current for “no plugin” is 2.67A, not 267mA…I forgot to multiply by ten for this measurement, my probe was on the scale 100mV/A. Yves De :

LO that, My experience would not agree with your thoughts. The one I recently bought off eBay seems to work as described in my previous message to Lou. NI software seems to like it as does at least

Its the 8516A 40GHz testset ! The manual outlines that FW 11.88 is required and SN 2812A or higher. Yes there are hardware changes, the CPU and sweep board have different part numbers , the 8516 uses

Not surprised at all ! Virtually all “NI” GPIB/USB adapters sold by Chinese vendors on ebay are Fake , unfortunately this also starts to spill over on US sellers as people who bought them from

Hi Lou, I believe I have NI-Visa 19.5 64 bit installed. I did an upgrade to the newest version tonight as the tool claimed I had an old version. I can confirm that both my Old and New NI-GPIB-HS both

What’s the test set and does it provide any reason why it requires a newer serial number source? I had a compatibility issue with my 8341 and 8510C but it was firmware related and simply fixed by

Interesting Dave, You must have installed NI drivers to get it to work. What version are you using? Regards Lou VK3ALB

I purchased recently from EBL2018 on a NI USB HS and it seemed to recognize fine on time labs. I can’t say 100% that I did anything else other than plugging it in and seeing software found it FWIW.

Thanks All, It probably won't surprise you as much as it disappointed me to learn that I bought a fake adapter from eBay. The seller gave me all my money back in a heartbeat as soon as I lodged a

John made a custom connector for LSSM not long ago, for a Varian 620 minicomputer. It needed some cleanup (copper whiskers from the milling

Hi All HP8640B's should have a card extender clipped over the main capacitors along with some spare PSU fuses, check if one is there.? Over the long manufacturing lifetime a number of different power

You should ask John Nery (WA1ESO) for a set of 8640B extenders. He is selling sets for specific instruments on the big platform or directly at avery reasonable price. These are sold as kits