UL-60691:2016 pdf free download – STANDARD FOR SAFETY Thermal-Links一Requirements and Application Guide.
4.4 For requirements for THERMAL-LINK packaged assemblies, see Annex H.
5 General notes on tests
5.1 The test conditions are as follows.
5.1.1 Unless otherwise specified, only tests that are not required to be performed inside an environmental chamber and/or test oven shall be carried out under the following atmospheric conditions:
— temperature: 15°C to 35°C,
— relative humidity: 25% to 75%,
— air pressure: 8,6 x Pa to 1,06 x 1 Pa.
The required atmospheric conditions during testing can be controlled when carrying out the tests and during the duration of the tests. The required atmospheric conditions do not have to be maintained in a test laboratory when tests are not performed.
5.1 .2 Where the conditions given in 5.1 .1 have a significant influence, they shall be kept substantially constant during the tests.
5.1.3 If the temperature limits given in 5.1.1 are too wide for certain tests, these shall be repeated, in case of doubt, at a temperature of (23 ±1 )°C.
5.2 In every test report, the ambient temperature shall be stated. If the standard conditions for relative humidity or pressure are not fulfilled during the tests, a note to this effect shall be added to the report.
5.3 If the result of a test is influenced, to an appreciable extent, by the position and method of mounting of the specimen, the most unfavorable condition shall be chosen for the relevant tests and recorded.
5.4 If a THERMAL-LINK has been specifically designed for use in a special type of equipment and cannot be tested separately, the tests of this standard shall be performed in that equipment or in the relevant part of it, or similar.
5.5 When testing a HOMOGENEOUS SERIES of THERMAL-LINKS, all the tests shall be applied to THERMAL-LINKS with the lowest and highest T. THERMAL-LINKS with intermediate RATED FUNCTIONING TEMPERATURES need only be subjected to tests according to 10.3, 11.3, 11.4 and 11.5.
5.6 The number of specimens is as follows.
5.6.1 The total number of specimens required is 48. Out of a total of 48 specimens, 15 are kept as spares in case some of the tests have to be repeated. Out of a total of 48 specimens, 33 are divided into 11 groups assigned an alphabetical letters from A to K. Each group consists of three specimens. Tests shall be performed in the order indicated in Table 1 but, if so required, tests may be repeated, for example the test on marking (see Clause 7). Additional samples may be needed according to Note 2 of Table 1.
For optional tests, additional samples will be required as per the applicable annexes.
5.6.2 If, in any of the tests carried out in accordance with any relevant test clause, a failure is reported, the cause of the failure will be identified and corrective action taken. Based on the failure analysis report and the corrective action, as a minimum, the test sequence shall be repeated on twice the number of revised specimens, and no further failures are allowed.
If no corrective actions are necessary, the test should be repeated with double the same size and no further deviation is allowed.
5.6.3 For requirements for THERMAL-LINK packaged assemblies, see Annex H.
5.7 The CONDUCTIVE HEAT AGEING TEST of Annex C is applicable when declared by the manufacturer.
The CONDUCTIVE HEAT AGEING TEST may be omitted if the THERMAL-LINK is constructed without contacts.