This standard specifies a method for testing the outgoing interference voltage of internally supressed relays and contactors only. The relay or contactor shall be subjected to tests to determine that outgoing interference voltage , which are produced by de-energizing the coil of the switching device , do not exceed the values specified in the product standard .It shall be used together with EN 2349-100.
AECMA PREN 2138-1997 history
1997AECMA PREN 2138-1997 Aerospace Series Washers, Flat, in Steel, Cadmium Plated Edition 2