Standards
EN61000-4-3
IEC61000-4-3 immunity testing requires that the EUT (equipment under test) operates satisfactorily when subject to a strong electromagnetic field.
This requires a frequency scan at a certain fixed level of field strength (specified by the standard). The 'scan' will comprise a series of 'steps' in frequency. Each step is specified as a percentage of current frequency value. This percentage is variable from 0.5% to 5%.
At each step, the frequency is held, the level adjusted to the required field strength (V/m) as measured by a field sensor, a prescribed modulation mode is initiated and then the conditions held for a 'dwell' time. The EUT should be monitored to detect faulty operation during the test. Typical values for field strength are 3 V/m for domestic and 10 V/m for industrial products. These fields are so intense that this test must be carried out in a screened room or test cell. Test cells such as the GTEM or Laplacell are highly efficient but restricted to small products, screened rooms can be large, but require very powerful amplifiers and "mode stirrers".
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