Service manual

Calibration and Verification
Routine Calibration 3
3-15
Range Zero and Gain Calibration Procedure
After the initial setup and connecting up, use the following procedure to calibrate range
zero, then positive and negative range gains on all DCV ranges. Just one range can be
calibrated if required, but for a full calibration start with the 200 mV range and work up
to the 1kV range, as shown in Table 3-3.
Table 3-3. DC Voltage Calibration Points and Sequence
8508A Range Point Voltage
Zero 0 mV
Range Gain +ve +100 mV
200 mV
Range Gain -ve -100 mV
Zero 0 V
Range Gain +ve +1 V
2 V
Range Gain -ve -1 V
Zero 0 V
Range Gain +ve +10 V
20 V
Range Gain -ve -10 V
Zero 0 V
Range Gain +ve +100 V
200 V
Range Gain -ve -100 V
Zero 0 V
Range Gain +ve +1000 V
1000 V
Range Gain -ve -1000 V
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 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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