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HP E1312A and HP E1412A Multimeter Specifications 181Appendix A
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 (part-per- million) of input” error as shown below.
% of input error =
ppm of input error =
Error Example
Assume that a 5Vdc signal is input to the multimeter on the 10 Vdc 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 5Vdc = 100
µV
Range error = 0.0005% x 10Vdc = 50
µV
Total error = 100
µV + 50µV = ±150µV
=
± 0.0030% of 5Vdc
=
± 30 ppm of 5Vdc
Total Measurement Error
Input Signal Level
--------------------------------------------------------------
X 100
Total Measurement Error
Input Signal Level
--------------------------------------------------------------
X 1 000 000,,