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Section 15: Calibration procedure
Current ranges
To calibrate each current range:
1. Determine the appropriate calibration current for the range.
a.
calibration current. Calculate the actual current using the formula
I = V / R
where:
I = Actual current
V = Calibrator voltage
R = Measured value of the calibrated precision resistor:
Detailed calibration information for the ±20 pA to ±2 mA ranges
Model 6517B
range
20 pA
200 pA
2 nA
20 nA
200 nA
2 mA
2. When calibrating the ±20 µA to ±20 mA ranges:
a.
b.
Turn the DC current calibrator output on.
c.
For each polarity, apply the currents between ±20 µA and ±20 mA listed in the Model 6517B range/full
scale current column of the below table to the model 6517B input.
d.
For each polarity, send the command in the Negative/Positive polarity calibration command column of
the below table with the actual current value to the Model 6517B.
3. Calculate (±20 pA to ±2 µA ranges) or note (±20 pA to ±2 µA ranges) the actual current.
4. When calibrating the ±20 pA to ±2 µA ranges:
a.
b.
Turn the DC current calibrator output on.
c.
For each polarity, apply the currents between ±20 pA and ±2 µA listed in the Model 6517B range/full
scale current column of the below table to the model 6517B input.
d.
For each polarity, send the command in the Negative/Positive polarity calibration command column of
the below table with the actual current value to the Model 6517B.
All currents applied to the input of the 6517B during calibration must be within ±5 % of the nominal
value
Calibration currents and commands
15-8
For the ±20 pA to ±2 mA current ranges, use the below table to determine the appropriate
Calibrator
voltage
Resistance standard
2.0 V
100 G
2.0 V
10 G
2.0 V
1 G
2.0 V
100 M
20.0 V
100 M
200.0 V
100 M
Turn the Model 6517B zero-check on.
Turn the Model 6517B zero-check on.
Model 6517B Electrometer Reference Manual
Nominal current
20 pA
200 pA
2 nA
20 nA
200 nA
2 mA
6517B-901-01 Rev. C / August 2015
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