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The reference capacitor is, of course, important in determining the unknown value, but so is the panel calibration of the bridge control. If the control has an error compared to the linear rotation, it will result in errors in reading.
One important thing is the knob-to-shaft alignment. If it's off at all, that will be reflected in all the readings in terms of an angular error. Many manufacturing tolerances come into play, and an inexpensive bridge can't deal with them all with much confidence compared, say, to a GR 1650, etc.
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