Coulombs Ranges Calibration - Keithley 6517B Reference Manual

Section 15: Calibration procedure

Coulombs ranges calibration

To calibrate each coulomb range:
1. Determine the calibration charge to be used during calibration. For the 2 nC to 2 mC coulomb
ranges, use the following table to calculate the appropriate calibration charge. Calculate the
actual charge using the formula
Q = C V
where

Q = Actual charge in coulombs

C = Measured value of the precision capacitor

V = Calibrator voltage
Coulomb range calibration values
Model 6517B
coulombs range
2 nC
20 nC
200 nC
2 mC
2. Connect the capacitor stated in the Standard capacitor column in the above table.
3. Set the calibrator voltage output to 0.0 V.
4. Calculate the actual charge (see Step 1) and send the command in the Coulomb full scale
calibration command column in the below table.
5. Set the calibrator voltage to the value in the Coulomb full scale calibration command column in
the below table.
Coulomb range calibration commands
Model 6517B
coulombs
range
-2 mC
2 mC
-200 nC
200 nC
-20 nC
20 nC
-2 nC
15-10
Calibrator voltage
2.0 V
20.0 V
2.0 V
20.0 V
Calibrator Coulomb zero calibration
voltage command
-20.0 V :CAL:PROT:CZEROB2U
20.0 V :CAL:PROT:CZEROA2U
-2.0 V
:CAL:PROT:CZEROB200N
2.0 V :CAL:PROT:CZEROA200N
-20.0 V :CAL:PROT:CZEROB20N
20.0V :CAL:PROT:CZEROA20N
-2.0 V :CAL:PROT:CZEROB2N
Model 6517B Electrometer Reference Manual
Standard
capacitance Nominal charge
1 nF 2 nC
1 nF 20 nC
100 nF 200 nC
100 nF 2 mC
Coulomb full scale calibration
command
:CAL:PROT:CN2U <value>
:CAL:PROT:C2U <value>
:CAL:PROT:CN200N <value>
:CAL:PROT:C200N <value>
:CAL:PROT:CN20N <value>
:CAL:PROT:C20N <value>
:CAL:PROT:CN2N <value>
6517B-901-01 Rev. C / August 2015