Patent ID: 7746092

Claim:
A measuring device with function of automatically selecting measuring function, comprising: a controller for sequentially providing a plurality of checking phases; a protection circuit with a first end connecting to an input end connected with DUT and a second end connecting to said controller, performing switching action according to signal of said controller; a switch composed of a plurality of test circuits, with a first end connecting to third end of said protection circuit, a second end connecting to said controller and sequentially performing switching action according to said plurality of checking phases for sequentially connecting said plurality of test circuits with said protection circuit, and said third end connecting to a current input end; and a DUT type detector with a first end connecting to a third end of said switch, sequentially comparing voltage of said input end with a comparison circuit and transmitting the result of comparison to said controller with a second end; wherein said controller determines type of DUT according to result of comparison transmitted by said DUT type detector.