DEVICE FOR TESTING SERVICEABILITY OF ELECTROMAGNETS OF TELEGRAPH APPARATUS WITH FAULT INDICATION Russian patent published in 1994 - IPC

FIELD: automatics. SUBSTANCE: device has power unit, electromagnets controlled by control unit and transistor switches, current transducers. To improve reliability by means of switching specific electromagnet off the multiplexer is brought into the device additionally which commutates each channel. Signal from the multiplexer enters flip-flop through comparator. The flip-flop is connected with V-input of counter, decoders and detects malfunctions by means of indicator. The other character of malfunction enters H-segment of indicator from comparator through the other flip-flop. EFFECT: improved reliability. 1 dwg