5 Test procedures
5.1 Severities
5.1.1 General
The test severities, in terms of air pressure and duration of exposure, shall be specified in the relevant specification. The values of air pressure should preferably be selected from those given in 5.1.2 and 5.1.3.
5.1.2 Air pressure
The test air pressure shall be specified in the relevant specification and should preferably be selected from Table 1. Further air pressure values according to standard atmosphere, are found in ISO2533.
5.1.3 Duration of exposure
The test duration shall be specified in the relevant specification and should preferably be selected from one of the following durations. Guidance on selecting an appropriate duration is provided in Annex A.
-5 min;
-30 min;
-2 h;
-4 h;
-16 h.
5.3 Initial measurements
The specimen shall be visually inspected and electrically and mechanically checked as required by the relevant specification.
5.4 Conditioning
It shall be possible to maintain the air pressures in Table 1, or as specified in the relevant specification, in the chamber with a tolerance of ±5 % or ±0,1 kPa whichever is the larger. The tolerance on the 84 kPa severity shall be ±2 kPa.
At the start and throughout the test, the test chamber shall be within the required temperature range specified by the standard atmospheric conditions for testing according to IEC 60068-1.
The specimen shall be introduced into the chamber in an orientation, configuration and operational state as specified in the relevant specification.
The pressure within the chamber shall then be reduced to the value appropriate to the severity. The relevant specification may limit the rate of change of pressure to not more than 15 kPa/min when considered necessary.
If required by the relevant specification, the specimen shall be operated and/or function inl accordance with the procedures set out in the relevant specification. For heat-dissipatingl specimens, the relevant specification may require the specimen temperature to be stabilized before any functional checks and/or measurements are made.
If required by the relevant specification, intermediate measurements shall be performed.
The air pressure shall be maintained for the specified duration. The air pressure shall be restored to normal. If required by the relevant specification, the rate of change of air pressure shall not exceed 15 kPa/min.
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