David wrote:
How useful is this
http://www.ebay.com/itm/281149723636 ?
On the fact of it, the device would give one a reasonly high
confidence something is working readlably well. I wonder if that is
good enough for a 3457A.
Let's assume that it is still working exactly the same as it was when
it was calibrated. The calibration values are recorded to 4-1/2
digits. So the uncertainty is greater than the two LSDs of a
3457A. Of course, it is almost certainly not working exactly the
same as it was when it was calibrated, which is going to put at least
the third LSD of a 3457A in question. So it is good enough for a
3457A only if one is content with a 3-1/2 digit verification on a
6-1/2 digit instrument.
Best regards,
Charles
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