[volt-nuts] Voltmeter calibration
bob91343 at yahoo.com
Sat May 31 01:15:08 EDT 2014
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
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
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.
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