| 摘要 |
1. A circuit arrangement for d. c. -isolated detection of binary electrical signals of different pulse levels by an opto-coupler (7) whose input is connected via a current-limiting resistor (6) to the input terminals (2 and 3) of the circuit arrangement, characterised in that a control circuit (5) is arranged between the input terminals (2 and 3) in series with the input of the opto-coupler (7) and the current-limiting resistor (6) to feed a current into the input of the opto-coupler (7) when actuated ; that a voltage-limiting device (1) arranged between the input terminals (2 and 3) emits signals of standardized level at its output, derived from the binary signals ; that a gate circuit (4) controlled by keying pulses (P) is connected between the output of the voltage-limiting device (1) and the control input of the control circuit (5) to sample the derived signals, and that the output of the opto-coupler (7) is connected to the input of a storage device (9) in which the voltage which occurs at the input of the storage device (9) when the current is fed into the input of the opto-coupler is stored at least for the time between two consecutive keying pulses, and is available at the output of the storage device (5). |
