Range Adjustment - Fluke 5730A Calibration Manual

Range Adjustment

Once artifact calibration is complete, it may be necessary to make further
adjustments to the range. To make a range adjustment, adjust a range constant,
which is an additional gain multiplier. Although range calibration is not needed in
order to meet absolute specifications, they are useful for tuning the Product so
that its values are closer to in-house standards.
Use an in-house laboratory standard to adjust the range constants. The
subsequent procedure for adjusting the range constants is designed for
laboratory standard values that are between 45 % and 95 % of the range's full-
scale value.
Once the range constant is adjusted, the new constant remains active until the
next calibration, at which time all range constant multipliers are restored to 1. All
range adjustments can be erased by selecting Restore Factory Defaults from
the Calibration Menu.
Before the subsequent procedure is started, make sure the equipment necessary
including in-house laboratory standards where necessary, are on hand.
The subsequent example procedure adjusts the 220 V dc range constant with the
listed equipment:
•
732B DC reference standard
•
752A Reference Divider
•
8508A
•
Low Thermal Test Leads: 5730A-7003 (spade lugs)
5440A-7002 and 5440A-7003 Low Thermal Lead sets include a third
cable specifically designed calibrating a Fluke 5440 series
instrument and is not specifically needed here. The 5730A-7002 and
5730A-7003 Low Thermal Lead sets do not include the third cable
for connection between reference standards.
Proceed as follows to adjust the 220 V dc range constant (the procedure is
similar for all ranges). Complete the calibration to external standards before the
range adjustment procedure.
Note
Multifunction Calibrator
Range Adjustment
37