Temperature Humidity Test
Test Standard: LV124
ü Damp heat, cyclic
|
Operating mode of DUT |
Operating mode II.a |
|
Total test duration |
144h |
|
Test variant |
Variant 1 |
|
Upper test temperature |
55 ℃ |
|
Number of cycles |
6 |
|
Number of DUTs |
6 |
ü Damp heat, cyclic (with frost)
|
Operating mode of DUT |
Intermitting between 40min operating mode II.a and 10 min operating mode II.c |
|
Total test duration |
240h |
|
Number of cycles |
10 |
|
Test cycle sequence |
The first five cycles shall include a cold subcycle and the remaining cycles shall be carried out without a cold subcycle |
|
Number of DUTs |
6 |
ü Damp heat, steady state
Severity 1
This test shall be carried out in accordance with DIN EN 60068-2-78 with the following parameters.
|
Operating mode of DUT |
Operating mode II.a |
|
Test temperature |
40℃ |
|
Humidity |
F(rel) = 93% |
|
Test duration |
21 dys |
|
Number of DUTs |
6 |
Severity 2
This test shall be carried out in accordance with DIN EN 60068-2-78 with the following parameters:
|
Operating mode of DUT |
Intermitting operation between 47h operating mode II.a and 1h operating mode II.c repeating until end of test duration |
|
Test duration |
As specifirf in the component requirement specification as per section 12.5.1 |
|
Test temperature |
65 ℃ |
|
Test humidity |
93% relative humidity |
|
Number of DUTs |
6 |
Prior to the execution of this service life test, a check shall be condected to ascertain whether the high test acceleration using the test parameters 65℃ and 93%RH. Exceeds the physical limits of the materials used in the components (eg. Hydrolysis of plastics). Where applicable, the contractor and client shall agree to changes in the test temperature and test humidity (eg. To +55℃ and 93%RH) while increasing the test duration as per the Lawson model such that the physical limits of the materials used are not exceeded during the test. The overall severity of the testing shall, however, remain unchanged. The test humidity shall not exceed the level of 93% RH.
[Deviating test sequence for components with reduced performance at high temperatures]
For components with reduced performance (e.g. reduction of backlight of LCD displays at high temperatures staring at T (op, max) (＜65℃) the test shall not - deviating from table 73: Test oarameters K-14 Damp heat, steady state- severity 2 - be carried out at a constant test temperature of 65℃, but with the following parameters (see table 73)
|
Operating mode of DUT |
Intermitting operation as per Figure 33 |
|
Test duration |
As specified in the component requirement specification as per section 12.5.1 (Lawson model). The ramp times between 65℃ and T(op,max) shall not be included in the test duration/ |
|
Test temperature |
The temperature gradient shall be selected such that no condensation occurs at the DUT |
|
Test humidity |
93% relative humidity |
|
Interval time T1 |
47h |
|
Interval time T2 |
1h |
|
Number of DUTs |
6 |
