Patent ID: 8737854

Claim:
A printing system, comprising: a) a rotatable transport member having an obverse and a reverse and adapted to transport a receiver on its obverse; b) a tackdown unit that includes: i) an electrode arranged facing the reverse of the transport member; ii) a source for selectively producing a tackdown current; iii) a charger spaced apart from the transport member facing the obverse thereof, the charger adapted to selectively deposit charge on a receiver on the obverse in response to the tackdown current; and iv) a non-contact voltmeter arranged facing the receiver on the obverse after the charger; and c) a control system adapted to: i) drive a selected voltage or current through the charger using the source and measure a resulting voltage using the non-contact voltmeter; and ii) using the selected voltage or current and the measured resulting voltage, automatically estimate a capacitance of the receiver.