Model 6517B Electrometer Reference Manual Appendix A: Accuracy calculations
6517B-901-01 Rev. C / August 2015 A-3
Calculating coulombs accuracy
From the specifications, coulombs is calculated as follows:
Accuracy = ± (% rdg + counts)
The following example shows how to compute accuracy for the 2 µC range:
Assume that the charge you are measuring is reading exactly 1.00000 µC on the 2 µC range.
From the specifications:
Accuracy = ± (0.4 % of 1 µC + 5 counts)
= ± (0.004 µC + 5 counts)
= ± (0.004 µC + 0.00005 µC)
= ± 0.00405 µC
Five counts on the 2 µC range equals 0.00005 µC.
Therefore, the accuracy range for the 1.00000 µC reading is 0.99595 µC to 1.00405 µC.
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