Adjustment and Verification
Routine Adjustment
6
Table 6-6. DC Current Adjustment Points and Sequence
8508A Range Point Current
200 µA Zero 0 µA
Range Gain +ve +100 µA
Range Gain -ve -100 µA
2 mA Zero 0 mA
Range Gain +ve +1 mA
Range Gain -ve -1 mA
20 mA Zero 0 mA
Range Gain +ve +10 mA
Range Gain -ve -10 mA
200 mA Zero 0 mA
Range Gain +ve +100 mA
Range Gain -ve -100 mA
2 A Zero 0 A
Range Gain +ve +1 A
Range Gain -ve -1 A
20 A Zero 0 A
Range Gain +ve +10 A
Range Gain -ve -10 A
The procedure assumes the user has knowledge of the actual output value of the
calibrator at the range gain values, from a measurement or from a certificate of
calibration. The
Set feature allows a user to enter the true output value of the calibration
standard where it differs from the nominal range gain point. If the calibrator output is
considered to be exactly nominal, use of the Set feature is not required, also omit steps 7
and 10 for the Range Gain Points.
On each range, the 8508A automatically recognizes the appropriate value as range zero or
range gain from the applied signal amplitude and polarity.
Range Zero and Gain Points
1. On the 8508A, select the required range.
2. On the Calibrator, select the positive Range Gain point Output value.
Deselect
AUTO to range lock the calibrator.
3. On the Calibrator, set zero output.
Select
OPR to operate the calibrator output.
4. On the 8508A, press
CAL to enter the Calibration Menu.
5. Press
SAMPLE to initiate the adjustment operation.
Adjustment is complete when the busy legend goes out and the calibrated
measurement is displayed.
6-29
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