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Condition Monitoring Sensor Multi Physics Box MPB10 lower limit of the frequency range in relation to block length

Article No: KA-09200
Version: 1.0
Subject to change without notice
We recommend to check the frequency limit settings in the vibration/Settings/advanced tab always after changing the block length.
Related Products
MPB10-VS00VSIQ00 MULTIPHYSICSBOX
Multi Physics Box

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Condition Monitoring Sensor Multi Physics Box MPB10 lower limit of the frequency range in relation to block length

The following information are from the MPB10 manual MPB10, 8028041 (sick.com) at page 14

The indication values can be calculated based on velocity or acceleration values. This selection is valid for the time domain and the frequency domain.
Indication values calculated based on velocity weight low frequencies more heavily.
Indication values based on acceleration, on the other hand, weight higher frequencies more heavily.
Phenomena that primarily cause vibration at frequencies up to 1,000 Hz can be better observed with velocity-based indication values. Acceleration-based indication values should be used to detect phenomena that primarily cause higher-frequency vibrations. Some examples are listed in table 4.

It should be noted that the velocity-based indication values also heavily weight the low-frequency noise. To obtain stable measured values when using this signal type, the lower limit of the considered frequency domain (Index 4478) should therefore be set as high as possible. The minimum value for this limit is 10 Hz with a block length of 640 ms and is set automatically when changing to the velocity signal type. The minimum values for this limit for the other block lengths are shown in table 5.

If you change via Sopas ET the the block length of 640ms (factory setting) with a lower limit of frequency range (Sopas tab vibration/Settings/advanced) of 10Hz:

 

... to a shorter block length of eg. 20ms the lower limit of the frequency range changes automatically to 320Hz:

 

If you now change back again to a longer block length, the lower limit of the frequency range wouldn't be adjusted automatically again, therefore you have to adapt it manually:

Therefore we recommend to check the frequency limit settings in the vibration/Settings/advanced tab always after changing the block length.
Keywords:
condition monitoring sensor, mpb10, block length, frequency range, lower limit, lower limit frequency range
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