Adjustment and Verification
Routine Adjustment
6
Range Zero and Gain Adjustment Procedure
After the initial setup and connecting up, use the following procedure to adjust range
zero, then positive and negative range gains on all DCV ranges. Just one range can be
adjusted if required, but for a full adjustment start with the 200 mV range and work up to
the 1kV range, as shown in Table 6-3.
Table 6-3. DC Voltage Adjustment Points and Sequence
8508A Range Point Voltage
200 mV Zero 0 mV
Range Gain +ve +100 mV
-1 digit -0.00001 mV
Range Gain -ve -100 mV
2 V Zero 0 V
Range Gain +ve +1 V
-1 digit -0.0000001 V
Range Gain -ve -1 V
20 V Zero 0 V
Range Gain +ve +10 V
-1 digit -0.000001 V
Range Gain -ve -10 V
200 V Zero 0 V
Range Gain +ve +100 V
-1 digit -0.00001 V
Range Gain -ve -100 V
1000 V Zero 0 V
Range Gain +ve +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 7
and 13 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.
6-15
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