34410A/11A User’s Guide 137
Specifications 5
Understanding the " % of range " Error The range error compensates for
inaccuracies that result from the function and range you select. The range
error contributes a constant error, expressed as a percent of range,
independent of the input signal level. The following table shows the range
error applied to the multimeter's 24
–hour dc voltage specification.
Total Measurement Error To compute the total measurement error, add the
reading error and range error. You can then convert the total
measurement error to a "percent of input" error or a "ppm
(parts
–per–million) of input" error as shown below.
Error Example Assume that a 5 VDC signal is input to the multimeter on
the 10 V range. Compute the total measurement error using the 90
–day
accuracy specifications: ± (0.0020% of reading + 0.0005% of range).
Reading Error = 0.0020% x 5 VDC = 100 mV
Reading Error = 0.0020% x 5 VDC = 100 mV
Total Error = 100 mV + 50 mV =
\150 mV
=
\0.003% of 5 VDC
=
\30 ppm of 5 VDC
Range Input Level Range Error
(% of range)
Range Error
(Voltage)
10 VDC 10 VDC 0.0004 ±40 mV
10 VDC 1 VDC 0.0004 ±40 mV
10 VDC 0.1 VDC 0.0004 ±40 mV
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