Linearity Check With Offset And Scale - Fluke 5730A Operator's Manual

Linearity Check with Offset and Scale

With the 5730A Calibrator offset and scaling features, a UUT offset and scale errors can
be removed to isolate and display linearity error. The subsequent procedure is an example
that uses the Offset and Scale selection to determine both scale and linearity error of a 4
1/2-digit DMM. In this example, the DMM is set to the 20 V dc range, and the Calibrator
is connected to the DMM. Figure 4-10 illustrates all three types of errors that are detected
by the Calibrator. The numbers in the graph correspond to the conditions encountered in
the example.
19.9017
Scale Error
19.9000
19.8987
Calibrator Voltage
10.000208
9.993208
Offset Error =
+1.3 mV
-1.3 mV
1. Set the Calibrator to 0 mV in standby.
2. Use the output adjustment controls (the rotary knob and IJ) to adjust the
Calibrator output for a reading of 0 V on the DMM. The displays shows:
Ideal
Response
0
10.000 10.007
Meter Reading
Figure 4-10. Meter Response vs. Stimulus
Front-Panel Operation
Linearity Check with Offset and Scale
Linear
Response
Actual Meter
Response
Linearity
Error
19.900
4
hhp020.emf
hhp136.tif
4-41