2.10.5.12 Conduct damp heat, cyclic test (CH)

This test is conducted to verify compliance with the provisions in R 60-1, 5.6.3.1 under conditions of high humidity combined with cyclic temperature changes

Applicable standards:

IEC 60068-2-30 [10]: Environmental testing – Part 2: Tests

Test Db and guidance: Damp heat cyclic (12 + 12-hour) cycle

IEC 60068-3-4 [11]: Environmental testing — Part 2: Tests. Guidance for damp heat tests

Test method	Exposure to damp heat with cyclic temperature variation
Test conditions	The relative humidity is between 80 % and 96 % and the temperature is varied from to , in accordance with the specified cycle.
Preconditioning of load cell	Load cell placed in the chamber with the output connection external to the chamber, and switched off. Use variant 2 of IEC 60068-2-30 Ed. 3.0 (2005-08) when lowering the temperature.
Initial measurements	Made according to 2.10.5.1 to 2.10.5.11
Test procedure in brief	This test consists of exposure to 12 temperature cycles of 24-hour duration each. Condensation is expected to occur on the load cell during the temperature rise. The 24 h cycle comprises: temperature rise during 3 hours, temperature maintained at upper value until 12 hours from the start of the cycle, temperature lowered to lower temperature level within a period of 3 to 6 hours, the declination (rate of fall) during the first hour and a half being such that the lower temperature level would be reached in a 3 hour period, temperature maintained at the lower level until the 24 h period is completed. The stabilising period before and recovery period after the cyclic exposure shall be such that the temperature of all parts of the load cell is within of its final value. Recovery conditions and final measurements: According to 2.10.5.13 to 2.10.5.15 .