UNIVERSAL TESTER Russian patent published in 1994 - IPC

FIELD: electric measurement technology. SUBSTANCE: universal tester has voltage presence control unit, resistance indication circuit, turning resistors, transistors, light-emitting elements, stabilizing diode. Resistance indication circuit has current amplifier made on the base of the first and the second transistors according to the emitter follower scheme. Base of the first transistor is connected to voltage presence control circuit. Stabilizing diode is connected between base of the first transistor and collectors of the first and the second transistors. Light-emitting element is brought into emitter circuit of the second transistor. The light-emitting element is connected in series with DC power supply, which has the second output connected with collector of the second transistor. Dismountable prod is connected with tester circuit by means of threaded connection. EFFECT: widened functional abilities; improved reliability of operation. 2 cl, 1 dwg