Re: [volt-nuts] Bohnenberger electrometer DANGER

Please be VERY VERY careful. To be honest its far safer to use CCFL drivers and rectify them with camera diodes in series and the absolute minimum capacitance for the job, shunted with a high value resistor. I have a few inverters , 10M resistor packs and diode strips here if anyone has a use

Re: [volt-nuts] Precision high resistance measurements / calibration of HP 4339B high-resistance meter. Fix?

Maybe one bad resistor? I've read that tin whiskering can occur even on relatively recent equipment, slower than lead free but still a problem. I'd do a visual inspection just to see, shouldn't be an issue. -A From: volt-nuts

Re: [volt-nuts] LM3900 (was: HP3458 ADC integrator) Instrumentation Amplifiers (3)

ittle chip. -A From: volt-nuts <volt-nuts-boun...@febo.com> on behalf of Attila Kinali <att...@kinali.ch> Sent: 01 March 2018 19:57 To: Discussion of precise voltage measurement Subject: [volt-nuts] LM3900 (was: HP3458 ADC integrator) On Wed, 28 Feb 2018 06:32:58 + Andre &

[volt-nuts] Bits in ancient Panasonic phone

often OCXO and other interesting bits, recall vaguely salvaging some of these from ancient cell base station boards that got flooded out. kind regards, -Andre #include "CTC101.h" From: volt-nuts <volt-nuts-boun...@febo.com> on behalf

Re: [volt-nuts] HP3458 ADC integrator (SPARES)

Can you make use of an LM3900? I have one here *somewhere*. I think its a quad Norton, not sure how long its been there for. also have a few canned op-amps etc -Andre From: volt-nuts <volt-nuts-boun...@febo.com> on behalf of Attila Kinali

Re: [volt-nuts] Low noise reference

also see https://workmanship.nasa.gov/lib/insp/2%20books/links/sections/407%20Splices.html -Andre From: volt-nuts <volt-nuts-boun...@febo.com> on behalf of Randy Evans <randyevans2...@gmail.com> Sent: 16 February 2018 18:39 To: Discussio

Re: [volt-nuts] Low noise reference

Yes I have relevant experience with Lifters, fingerprints generally are a nightmare. May also be worth mentioning that different grades of IPA are more or less useful, it absorbs water in its pure form so this needs to be taken into account. Use "no clean" fluxed solder if possible as it works

Re: [volt-nuts] Any list members in UK who can accurately characterise a 732A and a 10K resistor 4HV.org

Maybe I can ask on 4HV.org ? From: volt-nuts on behalf of David C. Partridge Sent: 15 January 2018 03:22 To: 'Discussion of precise voltage measurement' Subject: Re: [volt-nuts] Any list members

Re: [volt-nuts] Need Fluke 332B PCB contacts (possible source?)

I will have a look in my box of Tek stuff! It would also be worth asking someone at Offshore Electronics or Polar, as they often have strange stuff which gets recycled otherwise. Can someone please send me a picture of the component and I will check with the folks at "Lightbulb Nights" too.

Re: [volt-nuts] Best way to measure micro Ohms

but if you connect it properly eg with an oil droplet and clamp connnector using compatible vernier it should be fine. Looking at how wiring in the US is done might give you some ideas. Kind regards, -Andre From: volt-nuts <volt-nuts-boun...@febo.com> on

Re: [volt-nuts] 732A drift

thermal pad: it almost worked but in the end it was cheaper and simpler to buy one ready made (cough REF02 /cough) Also relevant, since originally buying my RS IDM65 you can now get I2C precision CT references which can replace the troublesome parts with something that