[volt-nuts] Calibration Device
Charles Steinmetz
csteinmetz at yandex.com
Mon Aug 12 11:45:29 EDT 2013
John wrote:
>David mentioned this:
> * * *
>What do people think of the device?
What are you trying to accomplish? As I posted previously:
>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, [so its last digit is going
>to be uncertain,] 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.
You should be able to rely on it to verify instruments to 3-1/2
digits. Beyond that, you would need something with a smaller uncertainty.
Best regards,
Charles
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