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Unread 02-02-2009, 11:55
mjcoss mjcoss is offline
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Join Date: Jan 2009
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Re: Noisy Accelerometer

While our team is planning on using WindRiver, I hooked up the LabView Accelerometer VI to get the pretty pictures of what was going on with the sensor. It is a very jagged plot with a +/- 0.15 V, making it virtually useless. This test is being done on a bench test setup, the cRIO is on a piece of plywood, and the sensor is using a PWM cable that is long enough so that the sensor is resting on the floor. (and it a concrete floor in a manufacturing facility) We do have an oscilloscope and could test things.

I'm a mentor, and as such I'm at work at the moment so getting data will have to wait till this evening. For us, I suspect that we're going to use the older sensor because a) it works, b) only need x and y axis, and c) I doubt that were going to see 3G accelerations to warrant messing further with the newer device.

I just wanted to add some data to the discussion. I like the theory that it's just some noise artifact that could be corrected by either software or a hardware fix. But it seems to me that the board is bad.