Chart recorder recording method and apparatus

Claim 1

A chart recorder using a fiber optics tube, said recorder comprising: a vertical deflection circuit; a vertical deflection yoke whose input is connected to an output of said vertical deflection circuit and which is attached to said fiber optics tube, said vertical deflection circuit including a saw-tooth oscillator; a horizontal deflection circuit; a horizontal deflection yoke whose input is connected to the output of said horizontal deflection circuit and which is attached to said fiber optics tube; and a timing controller which controls the timing of said vertical deflection circuit and said horizontal deflection circuit; wherein said horizontal deflection circuit comprises: a primary sample hold circuit, data signals obtained from a sampling being fed into an input of said primary sample hold circuit; a secondary sample hold circuit whose input is connected to a first output of said primary sample hold circuit; an adder whose input is connected to an output of said secondary sample hold circuit; a differential amplifier whose first input is connected to said output of said secondary sample hold circuit and whose second input is connected to a second output of said primary sample hold circuit; a V/I converter whose input is connected to an output of said differential amplifier; a switch circuit whose first terminal is connected to an output of said adder and whose second terminal is connected to an output of said V/I converter; and a capacitor which is charged by signals from said switch circuit.