source:Industry News Popular:adapter release time:2022-04-19 09:46:22 Article author:yu
1. Layout and configuration according to the actual use and installation conditions of the test product, including some standards that will change the additional resistance that reflects the internal resistance of the waveform generator signal.
2. Determine the test voltage level and test location according to product requirements.
3. On each selected test site, the positive and negative interferences should be added at least 5 times each, and the maximum repetition rate of each surge is 1 time/min. Because the protection devices used in most systems have a recovery period between surges, there is a maximum weight rate problem when the equipment is tested for lightning surges.
4. Whether the injection of the surge wave should be synchronized with the input voltage of the switching power adapter. If there are no special regulations, it is usually required to superimpose a recovery period on the zero-crossing point and the positive and negative peak positions of the voltage waveform of the switching power adapter, so the equipment is doing lightning surge signals.
5. Considering the non-linearity of the voltage-current conversion characteristics of the device under test, the test voltage should be gradually increased to the specified value of the product standard to avoid possible artifacts in the test (at high test voltage, because there may be A weak device breaks down, bypassing the test voltage, which makes the test pass. However, when the test voltage is low, because the weak device is not broken down, the test voltage is superimposed on the test equipment with the full voltage, which makes the test fail. ).
6. Lightning surge signal should be added between line and line or line and ground. If the line-to-ground test is to be carried out, and there is no special provision, the test voltage shall be applied between the first line and the ground in turn. But it should be noted that when doing the line-to-ground test, sometimes the standard requires the interference to be superimposed on two or more lines to the ground at the same time. At this time, the duration of the pulse is allowed to be reduced.
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