34410A/11A/L4411A User’s Guide 147
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
μV
Range Error = 0.0005% x 10 VDC = 50
μV
Total Error = 100
μV + 50 μV = \150 μV
=
\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 μV
10 VDC 1 VDC 0.0004 ±40 μV
10 VDC 0.1 VDC 0.0004 ±40 μV
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