Measurement Uncertainty; Test Accuracy Ratio (Tar) - Agilent Technologies 75000 C Series Service Manual

Measurement
Uncertainty
Closed Channel
Resistance Test
DC Isolation Test
Test Accuracy
Ratio (TAR)
32 Verification Tests
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For the performance verification tests in this manual, measurement
uncertainties are calculated based on the Agilent 3458A Digital Multimeter.
The measurement uncertainty shown in Table 2-1 is the accuracy of the
Agilent 3458A using 90-day specifications. The calculations follow.
Conditions:
•
4-wire ohms function, 10
•
90-day specifications
•
Worst-case reading = 2.0
M.U. = (15 ppm of Reading + 5 ppm of Range)
) + (
-6
= (15x10 * 2.0
Ω
-5
= 8.0x10
Conditions:
•
2-wire ohms function, 1 G
•
90-day specifications
•
Worst-case reading = 1.2 G
with the Agilent 3458A)
M.U. = (0.5% of Reading + 10ppm of Range)
) + (
9
= (0.005 * 1.2x10
Ω
6
= 6.1x10
Test Accuracy Ratios are not defined for single-sided measurements, so all
measurements have "NA" (Not Applicable) in the TAR column.
Ω
range
Ω
Ω
-6
5x10 * 10)
Ω
range
Ω
(highest resistance that can be measured
Ω
-6 9
10x10 * 1x10 )
Chapter 2