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

5730A
Operators 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.
Scale Error
Calibrator Voltage
Offset Error =
+1.3 mV
1. Set the Calibrator to 0 mV in standby.
2. Use the output adjustment controls (the rotary knob and ) to adjust the
4-42
19.9017
19.9000
19.8987
10.000208
9.993208
0
-1.3 mV
Figure 4-10. Meter Response vs. Stimulus
Calibrator output for a reading of 0 V on the DMM. The displays shows:
12/21/12 10:52am
Standby
-
Reference
0.00000 mV
External External
Sense Sense
OFF OFF
Ideal
Response
Linearity
Error
10.007
10.000
Meter Reading
+/- 3% (1 year) 213 days since calibration
Auto Range 220 mV
1.30000
42.00000
dBm
1.0000
kHz
External
Guard
OFF
Linear
Response
Actual Meter
Response
19.900
mV
Error
> +999.9999%
Wideband Setup
Menu
OFF
hhp020.eps
hhp136.eps