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Continued (2)
4.3 Vibration Step Stress Test
The vibration step stress is carried out at an ambient temperature of+20 ° C.
The vibration step stress of the tested product remains at the set point of 5GRMS vibration value, with an increment of 5GRMS and a 10 minute dwell time interval. After 30GRMS, the vibration decreased to 5GRMS to determine if a fault had occurred, and was not detected at higher vibration levels. If there is no fault in the detection of resonance vibration, the vibration will increase to the next level.
Vibration step stress test:
Setpoint (Grms) | Functional Test Result (Pass/Fail) | Notes |
0 | Pass | Sample no.2 was applied in this test. |
5 | Pass |
|
10 | Pass |
|
15 | Pass |
|
20 | Pass |
|
25 | Pass |
|
30 | Pass |
|
5 | Pass |
|
35 | Pass |
|
5 | Pass |
|
40 | Pass |
|
5 | Pass |
|
50 | Pass |
|
5 | Pass |
|
55 | Pass |
|
5 | Pass |
|
60 | Pass |
|
5 | Pass |
|
65 | Pass |
|
5 | Pass |
|
70 | Pass | The LED light panel kept flashing and the functional test items were not able to check as the value kept changing, but the LED light panel still can function and the test kept going. |
5 | Pass |
|
75 | Pass | The vibration operating limit and destruct limit was found at >75 Grms. |
5 | Pass |
|
During the testing of the LED driver, the vibration level of GRMS was recorded on the vibration table. The measurement bandwidth of the product's response is from 20Hz to 5000 Hz. The measurement results are summarized in Table 9. The energy spectral distribution of the measured frequency band in the power spectral density plot is included in Appendix B, with low set point levels (5GRMS and 75GRMS).
4.4 Comprehensive Environmental Stress Test
The system undergoes five temperature cycles, ranging from 60 ° C to+110 ° C, with an average thermal conversion rate of 70 ° C/minute combined with vibration. The starting point for vibration is set at 15 GRMS, with increments of 15 GRMS per thermal cycle. The dwell time at each extreme temperature is 10 minutes. Comprehensive environmental stress test:
End (3), continue (4).
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