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, [email protected] wrote:
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Today's Topics:
1. Voltmeter calibration (Bob Albert)
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Message: 1
Date: Fri, 30 May 2014 22:15:08 -0700 (PDT)
From: Bob Albert <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [volt-nuts] Voltmeter calibration
Message-ID:
<[email protected]>
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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