초록 ▼

A portable resistance tester comprises a pair of regulator circuits used to drive a bridge circuit and a detector circuit when measuring the resistance values of “in-circuit”test nodes. The tester produces an audible signal when the resistance of a measured test node falls within, or without, a pred

A portable resistance tester comprises a pair of regulator circuits used to drive a bridge circuit and a detector circuit when measuring the resistance values of “in-circuit”test nodes. The tester produces an audible signal when the resistance of a measured test node falls within, or without, a predetermined resistance range.

대표청구항 ▼

A portable resistance tester comprising: a bridge circuit including a reference resistance value and including test leads for connecting to an unknown resistance value, said bridge circuit further configured to provide a matched condition when said unknown resistance value is equal to said reference

A portable resistance tester comprising: a bridge circuit including a reference resistance value and including test leads for connecting to an unknown resistance value, said bridge circuit further configured to provide a matched condition when said unknown resistance value is equal to said reference value; a detector circuit including a plurality of comparator circuits having inputs coupled to said bridge circuit and outputs coupled to logic circuitry configured to excite a buzzer circuit in response to one of said matched condition and a no-matched condition; and a plurality of regulator circuits having inputs coupled to a battery and outputs coupled to said bridge and detector circuits, wherein one of said regulator circuits is configured to convert the output voltage of the battery to a first predetermined voltage level at said test leads and the other of said regulator circuits is configured to convert the output voltage of the battery to a second predetermined voltage level at said logic circuitry.