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Unread 08-04-2005, 08:43
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Re: How to measure low velocity

Quote:
Originally Posted by nobtiba
In the datasheet of ADXRS, it says that we can setting bandwidth by changing the external capacitors: f(out)=1/(2*pi*R(out)*C(out)). Do you think it can effect gyro's capacity of detecting low rate? If not, what is the function of setting the bandwidth?
This capacitor should not change the ability of the sensor to detect a low rate.

The purpose of this capacitor is to change the corner frequency of the low-pass filter on the sensor. You want to have a low enough corner frequency to avoid aliasing of your signal when you digitize the signal. Too much filtering and there will be a problem with a phase lag in the signal.

If you're not sure how to select the capacitor, search the internet on "nyquist frequency".
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