Service manual

Performance
Test Record
Table 2-2, Performance Test Record, is a form you can copy and use to
record performance verification test results for the multiplexers. Table 2-2
shows multiplexer test limits, DMM measurement uncertainty, and test
accuracy ratio (TAR) values.
Test Limits Test limits are defined for relay closed channel resistance and DC isolation
using the specifications in Appendix A - Specifications of the Agilent
E1346A Single Ended Relay Multiplexers User’s Manual . The relay contact
resistance and DC isolation specifications are single-ended, meaning that
there is an upper limit OR a lower limit, but not both. In Table 2-2, the
Minimum or Maximum column is blank for a single-sided test.
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 = 2.0 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 GΩ range
• 90-day specifications
• Worst-case reading = 1.2 GΩ (highest resistance that can be
measured with the Agilent 3458A)
M.U. = (0.5% of Reading + 10ppm of Range)
= (0.005 * 1.2x10
9
+ 10x10
-6
* 1x10
9
) Ω
= 6.0x10
6
Ω
Test Accuracy
Ratio (TAR)
Test Accuracy Ratios (TAR) are not defined for single-sided measurements,
so all closed-channel resistance and DC isolation measurements show NA
(Not Applicable) in the TAR column.
2-20 Verification Tests