Performance Test Record
Table 2-1, "Performance Test Record for the E1364A Switch Module," is a form you may copy and use to record performance verification test results for the switch module. Pages 3 and 4 of Table 2-1 show switch accuracy, measurement uncertainty (M.U.), and test accuracy ratio (TAR) values.
Switch Accuracy Accuracy is defined for closed-channel contact resistance and DC isolation using the specifications in Appendix A of the E1364A User’s Manual. The closed-channel resistance and DC isolation specifications are single-sided, meaning that there is an upper limit OR a lower limit, but not both. In Table 2-1, either the "Minimum" or "Maximum" column will be blank for a single-sided test.
Measurement Uncertainty
Closed-Channel Resistance Test
DC Isolation Test
Test Accuracy Ratio (TAR)
For the performance verification tests in this manual, the measurement uncertainties are based on 90-day accuracy specifications for the 3458A Digital Multimeter. The calculations are shown below.
Conditions:
–4-wire ohms function
–10 Ω range
–90-day specifications
–Worst-case reading = 3.5 Ω
M.U. = 15ppm of Reading + 5ppm of Range = 15 x 10-6⋅ 3.5 + 5 x 10-6⋅ 10 (Ω)
= 1.03 x 10-4Ω
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 3458A)
M.U. = 0.5% of Reading + 10ppm of Range |
= 0.005 ⋅ 1.2 x 109 | + 10 x 10-6⋅ 1 x 109 (Ω) |
= 6 x 106 Ω | |
Test Accuracy Ratios are not defined for single-sided measurements, so all closed-channel resistance and DC isolation measurements have "NA" (Not Applicable) in the TAR column.
Chapter 2 | Verification Tests 33 |
