CHECKING DEVICE Russian patent published in 1998 - IPC

FIELD: agricultural mechanical engineering. SUBSTANCE: device has at least one load condition signal forming unit, the main input of which serves as input for connection of active load and output is connected to signalling unit input. Common bus and power supply bus are connected to respective terminals of the above-indicated units. Unit forming the load condition signal is made in the shape of similar-conductivity transistors the bases of which have direct connection, and emitters are connected through first loading resistor. First transistor emitter is main input of given unit, and second transistor emitter is connected to power supply bus through second resistor and switch parallel-connected to the latter. Collector loads of transistors are connected to common bus. Base of second transistor is connected to its collector. In this case, valve element output connected to first transistor collector serves as output of load condition signal forming unit. Device is also provided with unit designed to analyze condition of check load circuit. This unit is made as logical condition analyzer and high-power electronic switch logical inputs. EFFECT: enhanced process of checking. 3 cl, 5 dwg