The Schr ö der lightning surge generator is used to evaluate the anti-interference performance of electronic and electrical equipment when subjected to overvoltage electrical pulses. Its process can be summarized into the following key steps:

1、 Preparation for the experiment

1. Equipment layout and configuration: Layout and configure according to the actual use and installation conditions of the test sample to ensure that the testing environment meets the standard requirements.

2. Select experimental parameters:

Select the test voltage level and test location according to product requirements.

Determine the experimental waveform, such as 1.2/50 μ s voltage wave and 8/20 μ s current wave (applicable to power ports) or 10/700 μ s voltage wave and 5/320 μ s current wave (applicable to communication lines).

3. Connect the device: Connect the lightning surge generator correctly to the device under test (EUT) to ensure that all connections are firm and reliable.

2、 Implementation of Schr ö der lightning surge generator test

1. Apply surge pulses:

At each selected test site, positive and negative interference should be applied at least 5 times each, with a peak repetition rate of 1 surge per minute for each surge. This is to simulate the randomness and intermittency of surge pulses generated by lightning strikes or switch operations in real environments.

For devices powered by AC, the injection of surge waves usually needs to be synchronized with the power supply voltage. Unless otherwise specified, it is usually required to superimpose surge signals at the zero crossing and positive/negative peak positions of the power supply voltage waveform.

2. Gradually increase the test voltage:

Considering the nonlinearity 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. The choice of power supply should be an automatic variable frequency power supply to avoid possible artifacts during the experiment.

3. Surge application method:

Surge should be added between the line or line ground. If a line ground test is to be conducted and there are no special regulations, the test voltage should be applied sequentially between each line and the ground. However, it should be noted that sometimes there are standard requirements to superimpose interference on two or more wires to ground at the same time, and in this case, the duration of the pulse can be reduced slightly.

3、 Monitoring and Recording of Schr ö der Lightning Surge Generator Test

1. Monitoring equipment status: During the testing process, closely monitor the working status of the tested equipment and record any abnormal phenomena.

2. Record experimental data: Use an oscilloscope or data acquisition system to record surge waveforms and device responses for subsequent analysis.

4、 Evaluation of experimental results

1. Performance criteria: Based on the functional performance of the equipment under surge interference, the test results are divided into the following categories:

Class A: The equipment functions normally and is not affected by any lightning surge interference.

Class B: Function or performance temporarily lost or reduced, but can be restored on its own after the disturbance stops, without the need for operator intervention.

Class C: Function or performance temporarily lost or reduced, but requires operator intervention to restore.

Class D: Loss of function or performance that cannot be restored due to hardware or software damage or data loss of the device.

2. Evaluation report: Based on the test results, write a detailed evaluation report to indicate whether the product meets the requirements of relevant standards and provide improvement suggestions.