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4
Front-Panel Operation
Instrument Setup
The second method is called "true value". Both methods can be used in this Calibrator.
The nominal method of error calculation uses the formula:
reference value – edit value
reference value
The nominal method is useful to check the error of the Calibrator itself, when its
performance is verified against a more accurate measuring device.
The true value method of error calculation uses the formula:
Reference value – edit value
edit value
With either the nominal or true value method, small changes in output value result in a
calculated error that is the same. In the example above, the display will show the error as
-30.0 ppm.
The true value method is useful for large changes in output value. For example, if
10.0000 V is applied to an analog meter, and then the Calibrator output is adjusted to
11.0000 V so that the analog meter now reads exactly 10 V, the true value method will
show:
nominal= +10.0000 V
rel err= -9.0909 %
-9.0909 % represents the relative error of the analog meter when compared to the true
value (11.0000 V in this case).
To select the UUT error calculation method:
1. Touch Setup>Instrument Setup.
2. Touch Error Reference until it shows the desired choice. The choices are "Nominal
Value" or "True Value."
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