[Test-Equipment] Question about VTVM calibration

[Barry]

... and I thought I was the only one who did that sort of thing.  ;)

I do have an older Fluke calibrator (760A) which is "most likely close enough" to calibrate my 410B and 410C.  After all, I think the last time I checked it against my Fluke DMM, it was "pretty close" so at least I have something that will run these old meters through their paces.  I only wish I could afford to have at least some of my test equipment officially calibrated but it's just a hobby so...

Thanks,
Barry - N4BUQ

----- Original Message -----
> From: "Ed via Test-Equipment" <test-equipment at mailman.qth.net>
> To: test-equipment at mailman.qth.net, cosmophone at yahoo.com
> Sent: Wednesday, February 5, 2020 9:46:39 AM
> Subject: Re: [Test-Equipment] Question about VTVM calibration
> 
> Calibrating our test equipment can be a real "rabbit hole" experience.
>   However, most exotic approaches are more suitable for voltmeters whose
> nominal accuracy is measured in parts per million.  For run of the mill
> meters like my HP 410C I bought a more expensive eBay calibrator (similar to
> that shown) which not only provides a reference DC voltage but also an
> accurate RMS AC voltage, as well as current and resistance standards.  This
> still leaves some room for error since I have no precision high voltage
> calibrator or RF voltage calibrator.  You can accumulate other calibrators
> and/or precision voltmeters which could be used to check the 410B, but each
> will have uncertain cal themselves.  So I find myself with several
> voltmeters which kinda agree with each other, but offer no certainty.
>   Fortunately, the spec on my VTVMs is only a few percent, so I can be pretty
> sure my 410C meets specs when compared to my .03% voltmeter, even if the
> .03% voltmeter may be out of cal.Have funEd W2EMN
> 
> -----Original Message-----
> From: Blair Batty <blairbatty at gmail.com>
> To: Brian Harris <cosmophone at yahoo.com>; Discussion of Electronic Test
> Equipment <test-equipment at mailman.qth.net>
> Sent: Wed, Feb 5, 2020 8:22 am
> Subject: Re: [Test-Equipment] Question about VTVM calibration
> 
> https://www.ebay.ca/itm/High-precision-AD584L-voltage-reference-module-reference-voltage-sourceL/171782257863?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
> 
> 
> On Tue, Feb 4, 2020 at 8:59 PM Brian Harris via Test-Equipment <
> test-equipment at mailman.qth.net> wrote:
> 
> >
> > I have a couple of excellent VTVMs, an ME-26D and an HP-410B but I have no
> > idea how accurate they are. I’d like to obtain some reasonable voltage
> > references with which I can calibrate them or, alternatively, a service
> > which can do them for me. I’m in Fayetteville Arkansas. What say ye?
> >
> > Brian WA5UEK
> > Sent from my iPhone
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