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Voltage drift in an analog data acquisition

I have developed a data acquisition program that inputs an analog signal from a micrometer, converts it to a diameter measurement, and displays the value numerically and graphically. It also does the same procedure with a thermocouple for temperature observations. This program monitors a component for about 8-14 hours. During observation, I'm seeing a periodic (sinusoidal) pattern in the charted data. I assume that this is a voltage drift (~mV). Is there any way to tune this voltage drift out since it is skewing my results?
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Hi Ethan,

it depends on the frequency of this noise signal.
From your question I undersand your signals are very slow, pratically DC voltages; in this case if the noise has a frequency of 50-60Hz you can filter it down by a low pass filter (either analog or digital).
If the noise has a much lower freq., then it is probably generated by the sensor.

Hope this helps,
Alberto
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