When I am looking at a datasheet for a DMM (Digital Multimeter) to calculate the accuracy of a measurement it specifies two error sources: of-range and of-value (also called of-reading). For example this datasheet for the Keysight 34470A: https://www.keysight.com/us/en/assets/7018-03846/data-sheets/5991-1983.pdf
I understand that the of-range error is mainly the offset error and the of-value error is the gain error.
But I don't get two things:
- Is the quantization error included in these of-range specifications or do I need to account for it separately? The examples always seem to suggest that the quantization error is in fact included.
- Is the random error included in the of-range error? If not, then how can I account for it, because I have never seen a DMM datasheet specify the noise (except for AC measurement)? If yes, than what is the confidence interval (2 sigma -> 95%, 3 sigma -> 99%, 4 sigma -> 99.99)?