Performance Verification 18-7
Calibrator voltage calculations
When verifying the 20pA-2µA current ranges and all charge ranges, you must calculate the
actual calibrator voltages from the desired current or charge values and the characterized Model
5156 Calibration Standard resistor and capacitor values.
Current calculations
Calibrator voltages required for verification currents are calculated as follows:
V = IR
Where: V = required calibrator voltage
I = verification current
R = actual standard resistor value
For example, assume you are calibrating the 20pA range using an actual 100.5GΩ standard
resistor value. The actual calibrator voltage is: 20pA × 100.5GΩ = 2.01V.
Charge calculations
Calibrator voltages for verification charge values are calculated as follows:
V = Q/C
Where: V = required calibrator voltage
Q = verification current
C = actual standard resistor value
For example, the required calibrator voltage for a 200nC range verification charge value with
a 99.5nF standard capacitance value is: 200nC/99.5nF = 2.01005V.
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