34410A/11A/L4411A User’s Guide 139
Specifications 5
To Calculate Total Measurement Error
The multimeter's accuracy specifications are expressed in the form:
( % of reading + % of range ). In addition to the reading error and range error,
you may need to add additional errors for certain operating conditions. Check
the list below to make sure you include all measurement errors for a given
function. Also, make sure you apply the conditions as described in the
footnotes on the specification pages.
• If you are operating the multimeter outside the temperature range
specified, apply an additional temperature coefficient error.
• For dc voltage, dc current, and resistance measurements, you may need to
apply an additional reading speed error or autozero OFF error.
• For ac voltage and ac current measurements, you may need to apply an
additional low frequency error or crest factor 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 shows the reading error applied to the multimeter's 24
–hour dc voltage
specification.
Range Input Level Reading Error
(% of reading)
Reading Error
(Voltage)
10 VDC 10 VDC 0.0015 ±150 μV
10 VDC 1 VDC 0.0015 ±15 μV
10 VDC 0.1 VDC 0.0015 ±1.5 μV
UG_ED5.book Page 139 Thursday, March 1, 2012 11:28 AM
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