Service manual

8508A
Service Manual
3-26
Table 3-6. DC Current Calibration Points and Sequence
8508A Range Point Current
Zero 0 μA
Range Gain +ve +100 μA
200 μA
Range Gain -ve -100 μA
Zero 0 mA
Range Gain +ve +1 mA
2 mA
Range Gain -ve -1 mA
Zero 0 mA
Range Gain +ve +10 mA
20 mA
Range Gain -ve -10 mA
Zero 0 mA
Range Gain +ve +100 mA
200 mA
Range Gain -ve -100 mA
Zero 0 A
Range Gain +ve +1 A
2 A
Range Gain -ve -1 A
Zero 0 A
Range Gain +ve +10 A
20 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 2-
4 for the Range Gain Points.
On each range, the Multimeter automatically recognizes the appropriate value as range
zero or range gain from the applied signal amplitude and polarity.
Zero Point
1. On the Multimeter, select the required range.
2. On the Calibrator, set to zero output and Operate.
3. On the Multimeter, press
CAL to enter the CALIBRATION menu.
4. Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated
measurement is displayed.
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