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Test Procedures for the Communications Technology

209 bytes added, 11:04, 23 April 2014
→‎13.3.4 Determination of Functional Life
Electrical life, failure rate, and reliability are statistical measures. To determine the electrical life the relays are switching the specified load in an accelerated way with higher switching frequency until the first pre-defined failure occurs. The number of switching operations reached for the representative sample size of relays is determined through statistically valid test setups using Weibull distributions. For all switching operations the failure criteria must be monitored and recorded.
<figure id="fig:Statistical evaluation of the electrical life of relays">
[[File:Statistical evaluation of the electrical life of relays.jpg|right|thumb|Statistical evaluation of the electrical life of relays (Operating parameters: 220VAC, 8A, 0.1Hz, resistive load; contact material AgCdO 90/10)]]
</figure>
Bild erstellen! Fig. 13.7: Statistical evaluation of the electrical life of relays (Operating parameters: 220VAC,8A, 0.1Hz, resistive load; contact material AgCdO 90/10) The large quantity of data generated during the tests can be only analyzed with computer based test systems. After all the relays failed a failure statistic is calculated and the expected electrical life is calculated based on the specified switching and operating criteria. <xr id="fig:Statistical evaluation of the electrical life of relays"/> (Fig. 13.7 ) shows in form of a Weibull diagram the results of a relay life test for a sampling of switching relays under a resistive AC load with failures after the first and the 10<sup>th</sup> occurrence analyzed. From such electrical life test it is also possible to statistically predict the failure rate of relays under certain specified load conditions.
===13.3.5 Testing Technology===
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