Keithley 6517B Reference Manual page 462

Model 6517B Electrometer Reference Manual
2. Turn on the Model 6517B and allow it to warm up for at least two hours before making
measurements.
3. Restore the Model 6517B to factory default settings using the procedure described in the topic
Considerations
4. Select the coulombs function and 2 nC range on the Model 6517B. Refer to
configuration
5. Compute the desired calibrator voltages using the formula:
V = Q / C
where:
V = is the calibrator voltage
Q = charge in coulombs
C = capacitance in farads
6. With zero check enabled, press REL to turn on the zero correct function.
7. Set the calibrator to 0.0 V, using the same range as the nominal value to be used.
8. Turn off zero check, and then set the calibrator output to the desired voltage. Allow the reading to
settle completely.
9. Verify that the Model 6517B reading is within the limits specified in the table below.
10. Set the calibrator to 0.0 V, and turn on zero check.
11. Turn off zero check, and then set the calibrator to the reverse polarity of the desired voltage.
Allow the reading to settle completely.
12. Verify that the Model 6517B reading magnitude is within the specified limits.
13. Turn zero check on.
14. Repeat steps 4 through 13 for the 20 nC, 200 nC, and 2 µC ranges.
Limits for 2 nC to 2 µC range verification
Model 6517B
range
2 nC
20 nC
200 nC
2 µ
6517B-901-01 Rev. C / August 2015
(on page 16-3).
(on page 4-33) for more information.
Standard Nominal voltage
capacitor value
1 nF 1.9 V
1 nF 19 V
100 nF 1.9 V
100 nF 19 V
Section 16: Verification procedure
Reading Limits
18° C to 28° C, 1
Charge year
1.9 nC 1.89235 nC to
1.90765 nC
19 nC 18.9235 nC to
19.0765 nC
190 nC 189.235 nC to
190.765 nC
1.9 µC 1.89235 µC to
1.90765 µC
Coulombs
16-9