| 摘要 |
PURPOSE:To facilitate an easy insulation of signals, by supplying an analog signal to a microcomputer from a process via a preamplifier, a V/F converting circuit, a signal insulator and an interval timer. CONSTITUTION:An analog signal Vin is supplied to a preamplifier 1 to be amplified and a signal Vc is delivered to a comparator 22 via an integrator 21. The comparator 22 delivers a signal to a one-shot circuit 23 to actuate it when the Vc is lower than zero. Thus a signal ''H'' is delivered to an interval timer 4 via a signal insulator 3, and at the same time a switch SW1 is turned on. The signal sent from the circuit 23 delivers the signal ''H'' for a period of a time point t0-t1. During this time T, a capacitor C1 is charged. |
