Sound and Vibration Measurement: First Demo of the test jig

26 Apr 2022

Sound and Vibration Measurement: First Demo of the test jig

For the Sound and Vibration Measurement Hat for Raspberry Pi road test, I'm reviewing Measurement Computing's IEPE Measurement DAQ HAT for Raspberry Pi.
Time to demonstrate the first setup of the Automated Vibration Test Jig.
In this video, the flow lets the vibration table shake from 20 to 40 Hz, with 2 Hz increment.
At each step, the MCC172 takes 32.768 samples, then calculates the RMS value of that result.
This gets written to a data file.

The video is real time. You will not hear the lowest frequency because my microphone (and your speaker) don't capture that. You can see the sample speed of the DAQ by looking at the LED blink time.
Excel output attached:

daqhatmcc172_0.xlsx

Link to all posts.

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shabaz over 3 years ago

Hi Jan,

That's very cool : ) How are you driving the speaker, through an audio amplifier?
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Jan Cumps over 3 years ago in reply to shabaz

Yes, it's the subwoofer part of a Logitech 3 speaker system. It has a built-in amp for the sub and for the stereo sattelites. I'm using the subwoofer circuit only. It has a 30 Hz to a few 100 Hz bandwidth (3 dB). I chose it because it's strong, easy to drive from a generator. And because it was only €15 at the flea market.
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Jan Cumps over 3 years ago in reply to shabaz

Yes, it's the subwoofer part of a Logitech 3 speaker system. It has a built-in amp for the sub and for the stereo sattelites. I'm using the subwoofer circuit only. It has a 30 Hz to a few 100 Hz bandwidth (3 dB). I chose it because it's strong, easy to drive from a generator. And because it was only €15 at the flea market.
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