[volt-nuts] AC calibration

[acbern at gmx.de]

what nist means is that a precision meter is not considered a standard. you always measure against a true standard (732a, esi sr104...). nist does not mean that as part of doing equipment calibration a 3458a cannot be used as aid. also keep in mind nist has a different approach than a cal lab, for obvious reasons. a cal lab would do a transfer measurement using a 3458a and a voltage/current source, sure.

there are precision ratio transformers available from various vendors, they can be used for low frequency precision calibrations, up to 20khz only (if anybodys knows one specified above 20khz I am interested to hear). so they will help you only partially in calibrating even a low precision 5101.


> Gesendet: Mittwoch, 27. August 2014 um 07:08 Uhr
> Von: pa4tim at gmail.com
> An: volt-nuts <volt-nuts at febo.com>
> Betreff: Re: [volt-nuts] AC calibration
>
> Thanks, I did not new NIST has so much interesting information on their site. 
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> I read the following on their site :
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> "multirange instruments with up to eight decimal digits of adjustability, are not considered by NIST to be standards "
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> Does that mean a HP3458 ? Fluke in the Netherlands used a HP-3458 and a 732 to calibrate the Fluke 5101 that  I'm working on at this moment (it failed calibration due to some hardware faults) 
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> Everybody thanks for the information. Turns out, a friend has a GR 1455AH for me, that is some kind a AC KV divider. 
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> I will test if the output of my HP 3400 is usable to connect a DMM. I have one I restored a few years ago. Besides that someone mentioned to look at the LT-1088.  
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> But that has to wait until I have some more time. I only repaired calibration, percission gear and RF stuff  for my hobby, but, not planned, I started to do this on a commercial base too. See my (non commercial) site about my collection calibration and other gear and projects  www.pa4tim.nl .
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> Today the 5101 goes back to the custommer but he brings 2 other instruments in need of some TLC and a precheck before they are shipped to Fluke for calibration.  And yesterday an other company asked if I want/can repair a G&M safety tester (a sort of megger on steroids) that died during calibration.  
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> Fred
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