EXPLOSIVEPROOF OHMMETER

摘要

The Ohmmeter is used to measure the resistance of theexplosive networks in ore mining. It includes Automatic CentralProcessor (ACP) (1) and indicator (2) supplied from terminals (3 &6) of battery (4) across an electronic switch (5). Thecurrent-sensitive circuit (7) connects terminal (3) acrosselectronic commutator (8) with a unit of reference resistors (9)and controls switch (5). Commutator (8) has a third outputconnected to one of the inputs for reference voltage of ACP (1)the second input of which is coupled to unit (9), together withone of the inputs of ACP (1) and an input terminal (10). Thelatter is also connected to one of the inputs of a comparator(11) the second input of which is connected to the second inputof ACP (1). The output of device (11) is coupled to the controlinput of commutator (8) and to indicator (2). Input terminal (12)is connected to one of the four outputs of an electroniccommutator (13) the second output of which is connected to thesecond input of ACP (1), the third output to the analogue mass(14) and the fourth one to terminal (6). The control input ofcommutator (13) is connected to the output of circuit (7). Switch(5) and termial (3) are connected to a supply control unit (14).1 claim, 1 figure(11) 275