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Measurement
Uncertainty
Closed Channel
Resistance Test
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 Ω range
• 90-day specifications
• Worst-case reading = 2.0 Ω
M.U. = (15 ppm of Reading + 5 ppm of Range)
= (15x10-6 * 2.0) + ( 5x10-6 * 10) Ω
= 8.0x10-5 Ω
DC Isolation Test
Conditions:
• 2-wire ohms function, 1 G Ω range
• 90-day specifications
• Worst-case reading = 1.2 G Ω (highest resistance that can be measured
with the Agilent 3458A)
M.U. = (0.5% of Reading + 10ppm of Range)
= (0.005 * 1.2x109) + ( 10x10-6 * 1x109) Ω
= 6.1x106 Ω
Test Accuracy
Ratio (TAR)
32 Verification Tests
Test Accuracy Ratios are not defined for single-sided measurements, so all
measurements have "NA" (Not Applicable) in the TAR column.
Chapter 2