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6) In the Cable Tag field, enter
a unique name for the cable
you are calibrating.
Choose the desired Action
radio button:
• To calibrate the cable,
choose Cal Cable.
• To reset the vales to zero
(if, say, the calibration
doesn’t work), choose Zero Values.
Click the OK button.
The Performance Tips window appears.
7) Make sure that all of the tips are true, then
click the OK button.
The Cell Required window appears.
8) Make sure that the correct Calibration Cell is attached,
then click the OK button.
The calibration runs.
The Done window appears.
9) Click the OK button to acknowledge completion.
Low I Range DC Calibration
The standard Reference 600+ calibration is performed with the cell leads connected to a 2 k resistor.
During the calibration procedure, DC current-range offsets are recorded with the cell switch turned off. A
DC current measurement is made on each of the eleven current ranges in the Reference 600+. The
measured current on each range is the sum of current contributions from:
• The input current of the I/E Converter input amplifier,
• The input current of the Working sense input amplifier,
• The input current of the Reference input amplifier,
• The input current of a Counter Sense input amplifier, and
• Current leakage in the cell switch.
In most real-world experiments, the cell is turned on, and the I/E converter does not measure the last three
terms listed above. These currents still exist, but they are generally sourced by the low-impedance counter
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