POSITIONING METHOD OF RECORDING PEN IN RECORDER

PROBLEM TO BE SOLVED: To improve the accuracy of transfer of the measuring signal to the recording signal as much as possible in a recording pen positioning method in recording device, which records the history of connectable measuring signal with the lapse of time, by cutting the direct current component between the measuring signal and a recording pen driving means for separation at a low cost. SOLUTION: Pulse width of the positioning deviation value signal 300 is modulated, and the positioning deviation value signal, of which pulse width is modulated, is transferred to a signal converting unit 70 at non-electric potential, and this signal converting unit 70 normalizes a difference value between the pulse continuing time and the pulse rest continuing time on the basis of a sum of the pulse continuing time and the pulse rest continuing time, and a control voltage for controlling a motor 90 is thereby decided.