[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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