[volt-nuts] History of HP 3456A
Marv Gozum @ JHN
marvin.gozum at jefferson.edu
Thu Dec 2 20:56:19 UTC 2010
Thanks Dick for your insights. Yes, so far I've the same experience,
except my springs are holding up. I've made sure the front panel of
the items I bought didn't look as battered [ one of the few things
noticeable from eBay photos], such as if it was salvaged from an
automated data acquisition set up, so its functions were accessed as
much via the GPIB bus than front switches alone.
2 of 4 models I've acquired haven't been calibrated in almost a
decade, based on stickers left on the devices sealing the calibration
panel; compared against a formally calibrated 3456a, it had drifted
to + 40 & 80uV respectively in ~10 years. Comparing their linearity
up to 500Vdc, they track spot on to at most within the error
introduced by their + drift as an offset.
The 3456a sans many automation features, has the same basic accuracy
as the 34401a, still in production. A low cost way to get the same
accuracy and precision in a home lab, and given its older technology,
a bit easier to maintain should it go senile.
At 02:25 PM 11/23/2010, Dick Moore wrote:
>Thanks, Marv, for putting this together. RE personal experiences,
>I've owned two 3456As and never had a probelm except one of them had
>front panel tactile swittches that kept losing their springs down
>into the bottom of the chassis. I've also owned 2 3457As and in my
>opinion, the 3456 was a FAR better meter in regards to stability of
>calibration and ease of use, not to mention clarity of readouts.
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