[volt-nuts] volt-nuts Digest, Vol 57, Issue 15

joesmith at cvctx.com joesmith at cvctx.com
Sat May 31 12:36:34 EDT 2014


WOW,, I would take a LOT of pride in owning such a difinative piece of 
hardware!

On Sat, 31 May 2014 12:00:01 -0400, volt-nuts-request at febo.com wrote:
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> Today's Topics:
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> 1. Voltmeter calibration (Bob Albert)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Fri, 30 May 2014 22:15:08 -0700 (PDT)
> From: Bob Albert <bob91343 at yahoo.com>
> To: "volt-nuts at febo.com" <volt-nuts at febo.com>
> Subject: [volt-nuts] Voltmeter calibration
> Message-ID:
> <1401513308.7302.YahooMailNeo at web122605.mail.ne1.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> I recently acquired an HP 3456A which has a tighter specification 
> than the EI.? It's also a couple of decades newer and has been 
> calibrated. 
>
>
> So I took a deep breath and opened the EI looking for a calibration 
> adjustment.? I found one, and tweaked it to bring the EI back into 
> specification.? It was off by about 0.06% and now it's within its 
> spec of 0.01%. 
>
> Pretty good gear, to hold its calibration so well for about a half 
> century!? And now it has a new lease, with its recalibration. 
>
> I also monitored the EI to see what its warmup time is.? It settled 
> very closely within about 15 minutes from a cold start.? And I mean 
> cold; I hadn't switched it on for quite a while.? (There is a 55C 
> oven in it, holding the reference temp constant.)
>
> Of course I don't need this unit any more but it's quaint and works 
> great.? It's not all that much bigger than the HP but lacks the 
> resistance measurement and a few other bells and whistles.? And the 
> big Nixie tube readout is cool. 
>
>
> Bob
>
>
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> End of volt-nuts Digest, Vol 57, Issue 15
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