Patent ID: 8513971
Filing Date: 2013-08-20
Classification: G01R

Abstract:
1. A detecting circuit comprising: a power supply circuit; a connector configured to be connected to a zener diode to be tested; a first indicating circuit connected to output terminals of the power supply circuit, wherein the first indicating circuit is configured to indicate whether the power supply circuit is powered on, and the first indicating circuit comprises a first light emitting diode and a first resistor connected to the first light emitting diode in series; a second indicating circuit and a start switch, wherein the second indicating circuit is connected to the first indicating circuit via the start switch, and the second indicating circuit comprises a second light emitting diode configured to indicate whether the connector is ready to test the zener diode, and a second resistor connected to the second light emitting diode in series, start switch is connected to the first indicating circuit and the second indicating circuit in series, the second light emitting diode is connected to the connector in parallel; a current limiting resistor connected to the power supply circuit and the connector; and a voltage meter connected to the connector in parallel; wherein the power supply circuit is configured to provide an output voltage that increases gradually, and the voltage meter is capable of obtaining a breakdown voltage of the zener diode when a voltage across the zener diode is unchanged as the output voltage increases.