6
Adjustment and Verification
Performance Verification
To Adjust at Spot Frequencies
Spot Adjustment is available only when in AC Voltage function with Spot already
selected on the
ACV CONFIG menu. Each spot (six per range) can be adjusted at a valid
input frequency to a non-nominal RMS value. In subsequent use, frequency response
flatness errors are reduced within ±10 % of the adjusted spot frequency.
Set up and connect the 8508A as described under AC Voltage Adjustment, Initial Setup
and Connections. The configuration defaults to
Tfer and RESL6 (both required).
Proceed as follows:
1. Select
ACV and select the required Range.
2. On the Calibrator, set the Output Voltage and Frequency.
Select
OPR to operate the calibrator output.
3. Press the
CONFIG key and select Spot.
4. Press the
CAL key.
The
CALIBRATION menu is displayed.
5. Select
Set.
The
SPOT CAL menu is displayed.
6. Select the soft key for the required spot, 1 to 6 (
Sp1 to Sp6).
The SPOT (x = 1 to 6) RMS menu is displayed.
7. Key in the true RMS output value of the standard, then select
Enter.
The
SPOT FREQUENCY menu is displayed, showing the frequency at which the
spot will be adjusted.
8. Press
SAMPLE to initiate the adjustment operation.
Adjustment is complete when the
Busy legend goes out and the adjusted
measurement is displayed. Select
QUIT to return to the SPOT CAL menu.
9. On the Calibrator, set
STANDBY.
10. On the 8508A, select other spots as required, repeating the process for each selection.
Performance Verification
The 8508A is a Digital Reference Multimeter offering state of the art performance. This
procedure is intended as a guide for qualified metrology personnel who have access to a
standards laboratory with equipment available to verify the performance of an instrument
of this level of accuracy. The procedure assumes users are familiar with relevant best
measurement practice, and will take precautions to avoid introducing errors from sources
such as thermal emfs, leakages, electromagnetic interference, etc. It also assumes users
will make adequate allowance for equipment stabilization and measurement settling
times.
This routine performance verification procedure describes the test points and sequence of
operations required to check the 8508A and assumes calibration references of adequate
traceable uncertainty are available – in this case a Fluke 5720A calibrator and 5725A
amplifier used with an 8508A-7000 Calibration Kit. The procedure assumes the user is
able to adjust and characterize the adjustment standards, without describing the process
required to do so. Refer to the Routine Adjustment section for more information on the
characterization process.
6-35
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