Keithley 6517B Reference Manual

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.

Keithley 6517B Specifications

General

Brand	Keithley
Model	6517B
Category	Measuring Instruments
Language	English