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Chapter 8 Tutorial
Measurement Fundamentals
Example: Calculating Measurement Error
Calculate the approximate measurement error for a pulse train input
with a crest factor of 3 and a fundamental frequency of 20 kHz.
The internal DMM is set to the 1 V range. For this example, use the
90-day accuracy specifications of (0.05% of reading + 0.04% of range),
as shown in chapter 9 on page 406.
Error
=
(0.05% + 0.04%) =
sine
Error
= 0.15%
crest factor
– 3
Error
=
bandwidth
4 x 3.14159 x 1000000
Total Error = 0.09% + 0.15% + 1.4% = 1.6%
0.09%
2
x 20000
100 = 1.4%
*
8
363
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