EMC test trials are implemented following a set of procedures and forming reports

To define and implement an EMC test of a project, a set of procedures should be followed to realize it, usually including the following processes:

1. Specific test outline and test rules

Based on the characteristics, purpose and classification of the tested part, the test outline puts forward test regulations, defines the level of the test, test category (such as frequency band, field strength, etc.), application standards, total number of tested parts, working state, sensitivity detection method, etc., guides the test and design, prepares test rules, and can also be used as archived data.

According to the information given in the test plan of the testing party and the proposed test items, test information, and distribution of test related matters, such as comprehensive test and test layout. Generally, the order of test items starts from transmission and radiation transmission test, which is not destructive and needs to be dealt with step by step. Power lines or anti-interference test items that may cause abnormal damage to the tested components due to increased impact are usually carried out at the end. For small tests, only test each instrument or touch bar test, without written test rules (such as fully following the standard), but the above allocation still exists.

2. Define the standards of all benchmarks

Generally, EMC military experimental instruments can be tested according to product classification and corresponding test standards. They must be tested according to the national military standard 151A/152A. The test specification contains two information: one is the test specification to obtain the specified value that the commodity must meet or meet; The second is the test method, which defines the unified test instrument index, test layout and test process.

3. Exchange test socket information

When the tested piece enters the laboratory, the layout of the instrument is placed and the monitoring equipment is connected. It is necessary to arrange and prepare the power connection in advance, especially the length of some connecting cables, such as the cables connected to the monitoring equipment, which must be considered professionally. There is sufficient length, and the transmission test power line should be extracted from the cable bundle, otherwise the correct test layout cannot be carried out.

4. Inspection instrument

Before announcing the EMC test, solve the problem of connection and function inspection of the test system to confirm that the test instrument works normally, the test connection is correct, and the test uncertainty is within the allowable range. This process can be carried out as a regular maintenance item before each test or according to the standard requirements.

5. Step by step test

EMC testing allows cross-execution of different test parts and different test items. For example, for the same test part, after the test of all items, the next test part must be tested, but the test standard of the same item must be kept unchanged. When using this method, the workload of the tester is large. A system needs to be replaced after each test. The phenomenon that the appropriate test parts are large and difficult to move; You can also change the next item after testing each test section according to the order of the test items. Some tests can measure several test components at the same time, such as radiation immunity test. Only the volume of the test components is not large and can be tested at the same time. The actual test sequence shall be allocated by both parties through negotiation.

6. Show the test report

After the EMC test, the recorded test standards, working parameters and other data shall be sorted and classified according to the tested parts and items to determine what basis, what failure, what failure conditions and conditions, the sensitive threshold or threshold level exceeding the specified value, the frequency point and intensity of transmission or radiation transmission test, and the test conclusion shall be analyzed and given, and the test report shall be generated.