Spectrophotometer Pen Drive Wavelength Drive Revolution Couftttr VMdir Root No. ... Block Diagram of Digital Printer for Cary Spectrometer The shaft of the wavelength digitizer is connected through suitable gears ... The output shaft of the servo motor is coupled mechanically to the balance potentiometer in the bridge circuit and to the absorbance digitizer. ... Since the miniature switches in the digitizing counters cannot handle these currents under the conditions of operation digitizinganbsp;...