Adjustment and Verification
Routine Adjustment
6
Range Zero and LF Gain Adjustment Procedure
After the initial setup and connecting up, use the following procedure to adjust range zero
then range gain on all ACI ranges at the currents and frequencies detailed in Table 6-7.
Just one range can be adjusted if required, but for a full-adjustment start with the 200 µA
range and work up to the 20A range.
Table 6-7. AC Current Adjustment Points and Sequence
8508A Range Point Current Frequency
200 µA
Zero (5 % Range)
10 µA
305 Hz
Range Gain
100 µA
305 Hz
2 mA Zero (0.5 % Range)
10 µA
305 Hz
Range Gain 1 mA 305 Hz
20 mA Zero (0.5 % Range)
100 µA
305 Hz
Range Gain 10 mA 305 Hz
200 mA Zero (5 % Range) 10 mA 305 Hz
Range Gain 100 mA 305 Hz
2 A Zero (5 % Range) 100 mA 305 Hz
Range Gain 1 A 305 Hz
20 A Zero (5 % Range) 1 A 305 Hz
Range Gain 10 A 305 Hz
The procedure assumes the user has knowledge of the actual output value of the
calibrator at each point, 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 point. If the calibrator output is considered to be exactly
nominal, use of the
Set feature is not required, also omit steps 4 and 8.
On each range, the 8508A automatically recognizes the appropriate value as range zero or
range gain from the applied signal amplitude.
1. On the 8508A, select the required range.
2. On the Calibrator, select the Range Zero point Output Current and Frequency.
Select
OPR to operate the calibrator output.
3. On the 8508A, press
CAL to enter the Calibration Menu.
4. If the Set feature is being used:
On the 8508A, select Set on the
CALIBRATION Menu.
Use the numeric keys with the
SET VALUE menu to enter the true output value of the
calibrator at the range zero point, then press Enter.
5. Press
SAMPLE to initiate the adjustment operation.
Adjustment is complete when the busy legend goes out and the calibrated
measurement is displayed.
6. On the Calibrator, select the Range Gain point Output Current and Frequency.
7. On the 8508A, press
CAL to enter the Calibration Menu.
8. If the Set feature is being used:
On the 8508A, select Set on the
CALIBRATION Menu.
Use the numeric keys with the
SET VALUE menu to enter the true output value of the
calibrator at the range gain point, then press Enter.
6-31
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