IEC 60068-2-1:2007 pdf free download.Environmental testing – Part 2-1: Tests – Test A: Cold.
IEC 60068-2-1:2007 deals with cold tests applicable to both non heat-dissipating and heat-dissipating specimens. For non heat-dissipating specimens, Tests Ab and Ad do not deviate essentially from earlier issues. Test Ae has been added primarily for testing equipment that requires being operational throughout the test, including the conditioning periods. The object of the cold test is limited to the determination of the ability of components, equipment or other articles to be used, transported or stored at low temperature. Cold tests cover by this standard do not enable the ability of specimens to withstand or operate during the temperature variations to be assessed. In this case, it would be necessary to use IEC 60068-2-14.
2 Normative references
lEC 60068-1: 1988, Environmental testing-Part 1. Genera/and guidance；
IEC 60068-2-14, Basic environmental test procedures-Part 2-14. Tests- Test N: Change of temperature；
IEC 60068-3-1, Environmental testing-Part 3: Background information-Section one: Cold and dry heat tests；
A specimen is considered to be heat-dissipating only if the hottest point on its surface measured in free air conditions (i.e with low air velocity circulation),is more than 5K above the ambient temperature of the surrounding atmosphere after temperature stability has been reached (see 4.8 of EC 60068-1).When the relevant specification calls for a storage or transportation test, or does not specify an applied load during the test, the Cold Test Ab will apply.
Under standard atmospheric conditions for measurements and test(see EC 60068-1) with an air velocity<0, 2 m/s achieved without induced air movement, the specimen shall be switched on or electrically loaded as specified for the low temperature at which the test is to be carried out.