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Matt asked What is a ring wave test?
Also, what is a ring wave? This relates to testing surge protectors and the way electrical devices operate.
And got the following answer:
http://www.appliancemagazine.com/editorial.php?article=1278 Ring wave tests: The ring wave test evaluates the overall system performance under the influence of typical power surges, resulting from lightning and load switching at power sub-stations. Typically the equipment under test is subjected to 100 KHz, 0.5 usec rise time pulse as described in IEEE C62.41-1991 standards, and a peak voltage should be at its maximum of 6,000 V. This test is administered at various angles of coupling, in 45-degree angle increments, covering the full cycle of 360 degrees. It is important to note that the test has to be carried out with a well-defined system wiring structure and mechanical structure, as it has a large impact on the performance of the electronics of the appliance. This means that any further changes in the system wiring after the test invalidates the results and calls for repetition of the test. In addition, the time interval between the two applications is critical, as it affects the component performance. Note that these tests result in degradation of performance of protecting devices such as MOVs and X, Y capacitor performance. Generally, a leakage current test is carried out to ensure that the leakage currents are within the safe limits. A careful selection of the MOV energy rating is recommended. The expectation would be to meet UL 858A Section 12 requirements. http://www.appliancemagazine.com/editorial.php?article=1277 Surge Tests: During surge tests, it is observed that solid-state power switches such as triacs fail frequently by a partial low resistance path that makes the device "on" without a gate control signal. This is due to the violation of static dV/dt ratings of the device in operation. Recommendations from the manufacturer need to be followed to overcome this type of failure. It is also a good practice to provide "physical cutouts" between the pins (for pin-through-hole parts only) on the layout. A good metal oxide varistor (MOV) of correct clamping voltage should be chosen to arrest the energy at the entry point. Improper and low-cost relays might result in permanent weld of the contact points and relay failures. Also another nice site to check upon and download the PDF: http://www.haefelyemc.com/pdf_downloads/documentations/003_COMBIundRINGWAVE.pdf