<vibration-random-wide-band>
[IEC 60068-2-34;IEC 60068-2-34;;all;], [IEC 60068-2-37;IEC 60068-2-37;;all;] [DIN 40046;DIN 40046;;Part 22 - 25;].
The test shall simulate the fatigue load of the DUT in the X-, Y- and Z-axes. In general, the test is carried out in vehicle mounting position with the provided fixing elements.
The crest factor is the quotient of the maximum acceleration and the effective value of the acceleration.
Figure 68: structure of wide band random vibration test
Type of vibration:
Wide band random vibration
Test axes:
...
Frequency range:
f Frequency range
MIN = 10 Hz
MAX = 1000 Hz
Load duration:
t Load duration
ABS = 8 h per axis
Effective value of acceleration:
aeff Effective value of acceleration
ABS = 38,1 m/s2
Crest factor:
CF crest factor
ABS = 3,0
Form of the spectrums:
10 - 50 Hz: G(f)=0,2 g2 / Hz constant
50 - 66,7 Hz: G(f)=0,2 to 0,02 g2 / Hz decreasing by -24 dB / octave.
66,7 - 100 Hz: G(f)=0,02 g2 / Hz constant
100 - 1000 Hz: G(f)=0,02 to 0,002 g2 / Hz decreasing by -3 dB / octave.
Ambient conditions
Test temperature profile:
...
Operating states:
2.2
Evaluation criteria
Input criteria:
The previous function test is regarded as an electrical evaluation. The cases have to be examined for hair cracks and deformations.
Pass-through criteria:
No interference may arise during the test.
Output criteria:
The test is approved if the device parameters which correspond to the function of the DUT are within the specified limits after the application of load. The visual inspection includes control with respect to cracks and other mechanical damages.
Additional specifications:
When passing the lower stress temperature, the DUTs have to be disconnected.