Service manual

Performance
Test Record
Table 4-1, Performance Test Record for the Agilent E1326B Multimeter,
is a form you can copy and use to record performance verification test
results for the multimeter. Page 3 of Table 4-1 shows multimeter
accuracy, measurement uncertainty and test accuracy ratio (TAR)
values. See Appendix A - Calculating Multimeter Accuracy for example
calculations of Table 4-1 entries.
NOTE
The accuracy, measurement uncertainty, and TAR values shown in Table
4-1 are valid ONLY for the specific test conditions, test equipment, and
assumptions described. If you use different test equipment and/or change
the test conditions, you will need to compute the specific values for your
test setup.
Multimeter
Accuracy
Accuracy is defined for DC Voltage, AC Voltage, and 4-Wire
Resistance measurements using the 1-year specifications in Appendix A -
Specifications in the Agilent E1326B/E1411B User’s Manual. In Table
4-1, the "High Limit" and "Low Limit" columns represent the multimeter
accuracy for the specified test conditions.
Measurement
Uncertainty
For the performance verification tests in this manual, measurement
uncertainties are calculated assuming a Datron 4708 source for inputs to
the multimeter. Measurement uncertainties in Table 4-1 are calculated
for the 90-day accuracy specifications in the Datron 4708 User’s
Handbook.
Test Accuracy
Ratio (TAR)
In Table 4-1, the "Test Accuracy Ratio (TAR)" is calculated from (high
limit - expected measurement)/measurement uncertainty. (To meet
MIL-STD-45662A requirements, the TAR must be 4:1 or greater.)
"N/A" means measurement uncertainty and TAR do not apply to the
measurement. Although all TAR values are > 10:1, the entry for each
value is > 10:1.
4-14 Verification Tests