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Andon Salvarinov
Apr 19, 1996, 3:00:00 AM4/19/96
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I am trying to measure very low forces that are occuring due to slipping and
or friction. Measuresment is going through strain measuresment and for strain
gages I am using an metal based strain gage (factor 2).
The problem is in that the output of the wistone bridge which is used
is in less then 100nV . Could someone give me a hint about this issue?
or friction. Measuresment is going through strain measuresment and for strain
gages I am using an metal based strain gage (factor 2).
The problem is in that the output of the wistone bridge which is used
is in less then 100nV . Could someone give me a hint about this issue?
Thanks Ahead
Andon
Albert Lee Mitchell
Apr 19, 1996, 3:00:00 AM4/19/96
to
Whetstone bridge strain gauge output is typically followed by an
instrumentation amplifier such as Linear Technologies LT1001 which has a
gain of about 100. You can then use a standard opamp to bring it up to a
level your meter or micro can measure. Note that this circuit usually has
so much noise that a low pass filter is often required.
-- Regards, Albert
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AM Research, the Embedded Control Experts. http://www.amresearch.com
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