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servo movement jerky

Hi,
I am using usb daq usb-6008 to output an analog dc reference voltage into a comparator ia PWM circuit. The PWM signal is then fed into a RC servo(hobby servo). The problem I am having is that the servo is jerky even at a constant voltage. When I change the reference voltage to move the servo position it jerks back and forth even more. This might be due to the low accuracy of the analog output channel. Can anybody suggest a solution to stabilize the servo?

Thanks
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Sounds like your servo feedback gain is too high, on the edge of being unstable.
John Weeks

WaveMetrics, Inc.
Phone (503) 620-3001
Fax (503) 620-6754
www.wavemetrics.com
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