The test method and procedure of the lightning surge generator are as follows.
1. Layout and configure 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 source)
2. Select the test voltage level and test location according to product requirements
3. On each selected test site, the interference of positive and negative polarity should be added at least 5 times each, and the maximum repetition rate of each surge is 1 time/minute (because the protection devices used in most systems are used in two There must be a recovery period between surges, so there is a problem of maximum repetition rate during the lightning surge test of the equipment)
4. For equipment powered by AC, it is also necessary to consider whether the injection of surge waves should be synchronized with the power supply voltage. If there are no special regulations, it is usually required to superimpose a surge signal at the position of the zero-crossing point and the positive and negative peak points of the power voltage waveform.
5. Taking into account the non-linearity of the voltage-current conversion characteristics of the tested equipment, the test voltage should be gradually increased to the specified value of the product standard to avoid possible false appearances in the test (at high test voltages, 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 applied to the test equipment at full voltage, which makes the test fail. )
6. Surge should be added between line-line or line-ground. If the wire-to-earth test is to be carried out, and there is no special regulation, the test voltage should be applied between each wire and the ground in turn, but it should be noted that sometimes the standard requires interference to be superimposed on 2 or more wires at the same time In the case of the ground, the duration of the pulse is allowed to be reduced at this time.
7. Since the test may be destructive, never make the test voltage exceed the specified value
