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If you would like to know more on the matter you can look at ANSI/NCSL Z540-1-1994. That is the spec that calibration labs have to follow. You can use a NIST STANDARD or transfer standard for your instrument calibrations...either way there is a 4:1 test accuracy ratio simply meaning whatever instrument you are calibrating has to be done by another instrument that is 4 times more accurate. And talk about compounding percentages that spec also says that the collective uncertainty of the measuring standards shall not exceed 25% of acceptable tolerance for each characteristic. lol.

[QUOTE="Unit 75, post: 683961, member: 42248"] If you would like to know more on the matter you can look at ANSI/NCSL Z540-1-1994. That is the spec that calibration labs have to follow. You can use a NIST STANDARD or transfer standard for your instrument calibrations...either way there is a 4:1 test accuracy ratio simply meaning whatever instrument you are calibrating has to be done by another instrument that is 4 times more accurate. And talk about compounding percentages that spec also says that the collective uncertainty of the measuring standards shall not exceed 25% of acceptable tolerance for each characteristic. lol. [/QUOTE]

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