6 Test procedure
6.1 Confirmation of performance
IEC 60068-3-5 provides guidance for the confirmation of performance of temperature test chambers. IEC 60068-3-1 provides general guidance for the performance of Tests A and B.
The chamber shall be large enough compared with the size and amount of heat-dissipation of the test sample.
6.2 Working space
The dimensions of the test sample shall be such that it is entirely within the working space of the test chamber.
The temperature of incident air delivered to the test specimen shall be within ± 2 K of test severity temperature during the steady-state condition. The air temperature in the working space shall be measured in accordance with 4.5.
Where, due to the size of the chamber, it is not feasible to maintain these tolerances, the tolerance may be widened to ±3 K down to -25 ℃ and ±5 K down to -65 C. When this is done, the tolerance used shall be specified in the test report.
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