Equipment Required For Adjustment - Fluke 8508A User Manual

8508A
Users Manual
adjustment to reduce the uncertainties. The errors may be determined by measurement
against suitable standards or may be taken from an applicable certificate of calibration.
The uncertainty of the characterized calibrator should be combined with the 8508A
Relative to Standards specifications to determine the 8508A performance after
adjustment. (RSS summation is recommended).
If the calibrator is not characterized to determine its errors from nominal, its output
should be assumed to be nominal at all points. Its performance specifications should be
used to provide calibration uncertainties to be combined with the 8508A Relative to
Standards specifications to determine the 8508A performance after adjustment. (RSS
summation is recommended).
See Chapter 5 for more details of combining 8508A Relative to Standards specifications
and calibration uncertainties.
The instrument should be thoroughly checked to ensure it is operating
correctly before attempting adjustment. A performance verification
procedure appears later in this section.

Equipment Required for Adjustment

The equipment required for Adjustment and Performance Verification is listed in
Table 6-1.
Fluke 5720A Multifunction Calibrator
Fluke 5725A Amplifier
Fluke 8508A-7000K Calibration kit comprising 1 G Ω Standard, two precision low thermal emf
4-wire short devices, and connecting leads.
1.
2.
Alternate equipment may be used, but users should ensure it provides adequate
calibration uncertainties. Performance of the 8508A after adjustment should be
determined by combining the applicable calibration uncertainties provided by the
calibration equipment with the 8508A Relative to Standards specifications. (RSS
summation is recommended).
6-10
Table 6-1. Required Equipment for Adjustment and Performance Verification
2
Availability of a 1 MHz frequency reference signal may be required for 5720A frequency locking during 8508A
frequency adjustment procedure.
Best uncertainties are obtained by characterizing the outputs of the 5720A and 5725A at the points used for 8508A
adjustment.
Note
Equipment Required
1 2