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Unread 31-01-2010, 13:07
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What would Dave do?
AKA: Peter Kieselbach
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Re: How Precise and Accurate is the Analog In on the Crio?

Tom: I've spent a bit of time in the data acquisition/measurements world and recommend that you not go directly from the strain gauge bridge to the 9201. You probably could make it work on the bench, but I'm pretty sure the signal will be too noisy to be of use in the real world of competition. Main sources will be mechanical vibrations and motor noise, as well as impact spikes caused by contact with other robots, etc.

If I were to try this I would go with a preamp with some low-pass filtering. I'd probably try ~ 200Hz as a corner frequency to start with to remove some of the common vibrations and then see what the signal looks like.

Manoel: your approach sounds workable, but doesn't provide accurate force feedback which is the key benefit of Tom's concept.
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