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Measurement

Uncertainty

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 2-2 is the accuracy of the

Agilent 3458A using 90-day specifications. The calculations follow.

Closed Channel

Resistance Test

Conditions:

• 4-wire ohms function, 10 Ω range

• 90-day specifications

• Worst-case reading = 2.7 Ω

M.U. = (15 ppm of Reading + 5 ppm of Range)

= (15x10

-6

* 2.7) + (5x10

-6

* 10) Ω

= 9.05x10

-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 * 1.2x10

) + (10x10

-6

* 1x10

) Ω

= 6.01x10

Ω

Test Accuracy

Ratio (TAR)

Test Accuracy Ratios are not defined for single-sided measurements, so all

measurements have ’NA’ (Not Applicable) in the TAR column.

34 Verification Tests Agilent E1465A/66A/67A Service Manual

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Agilent Technologies E1465A Wartungshandbuch Seite 36