[volt-nuts] HP 3457A calibration?

[J. L. Trantham]

Interesting video.

His 'cal certificate' shows no data other than 'in tolerance' and the
'standards' used to established that.

He also makes a point of the 'calibration counter'.

On the 3458A that I was able to 'kill' the 'cal RAM', the 'cal counter' was
at '1' when I received it.  When I finished doing my 'home cal' on a 'blank'
'cal RAM', the 'cal counter' was about 20 or so.  It appears that every
measurement that is calibrated increments the 'cal counter'.

I don't recall how many ranges the 3457A has but add them all up and that is
what I would expect the 'cal counter' to increment by once you finish a
'home cal'.

Since Agilent does all this via HPIB (at least that's what I think), it
increments the 'cal counter' only by '1' step.

I would opt for a 'cheaper' 'seems to be working' 3457A then send it to
Agilent for their calibration rather than spend extra for someone else's
calibration.

Joe
WB4BPP

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
Behalf Of Joseph Gray
Sent: Monday, August 19, 2013 8:20 PM
To: Discussion of precise voltage measurement
Subject: [volt-nuts] HP 3457A calibration?

Recently, we were discussing where to get a DMM calibrated. Someone
mentioned an ebay seller in Albuquerque who had their meters calibrated
across town by a company with a similar name.

I am currently watching a YouTube video about the HP 3457A. At around 7
minutes, take a look at the calibration certificate when he holds it up.

http://www.youtube.com/watch?v=HfxpJCdgVwc

Joe Gray
W5JG
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