To Calculate Total Measurement Error - Agilent Technologies 34420A User Manual

Chapter 8

To Calculate Total Measurement Error

To Calculate Total Measurement Error
Each specification includes correction factors which account for errors
present due to operational limitations of the meter. This section explains
these errors and shows how to apply them to your measurements. Refer
to "Interpreting Meter Specifications," starting on page 285, to get a
better understanding of the terminology used and to help you interpret
the meter's specifications.
The meter's accuracy specifications are expressed in the form:
(% of reading + % of range)
In addition to the reading error and range conditions, make sure you
apply the conditions as described in the footnotes on the specification
pages.
If you are operating the meter outside the 23° C ±5° C temperature
range specified, apply an additional temperature coefficient error.
Understanding the " % of reading" Error. The reading error
compensates for inaccuracies that result from the function and range you
select, as well as the input signal level. The reading error varies
according to the input level on the selected range. This error is expressed
in percent of reading. The following table illustrates the reading error
applied to the meter's 24-hour dc voltage specification.
Range Input Level
10 V 10 V
10 V 1 V
10 V 0.1 V
Reading Error Reading Error
(% of reading)
0.0002
0.0002
0.0002
Voltage
20 V
2 V
200 nV
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