[volt-nuts] HP 3456A AC cal
marvin.gozum at comcast.net
Fri Sep 12 12:14:32 EDT 2014
The 3456a is ~20x less accurate than the 3458a in VAC. That's as good as it gets.
Here's a comparison of all the top DVM as provided in the 1993 HP equipment catalog, 1993 was unique in that it covered many generations of DVM/DMM many of which were soon to be dropped from sale.
Click or go to the link:
The 3456a shines in DCV.
A used 34401a typically sells for $300-700, a 3457a ~ $200-400, 3458a ~ $2,000-5000 but a 3456a is ~$70, it offers very good bang for buck in DCV.
----- Original Message -----
From: "Richard Moore" <richiem5683 at gmail.com>
To: volt-nuts at febo.com
Sent: Thursday, September 11, 2014 7:30:26 PM
Subject: [volt-nuts] HP 3456A AC cal
I'm trying to get my head around the AC cal procedure for the HP 3456A
-- there is no full-scale cal, just some extremely finicky tweaks for
the bottom ends of three of the four ranges. I really don't understand
how this is supposed to work, especially since it is very accurate on
all DC ranges (up to 500V -- above that some heating of the divider R
seems to occur and it loses accuracy as the voltage increases). But on
AC, the tweaks don't result in anything like an accurate level reading
compare to my 3458A -- at 10VAC it is off by hundreds of ppm. Anybody
shed any light on this? Is there a way to get full scale cal points in
AC mode? Any mods to fix this -- lovely meter otherwise; I much prefer
it to the 34401A I used to have, except for the overall bigness....
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