Patent ID: 7679460

Claim:
A crystal oscillator tester for testing a crystal oscillator, the tester comprising: a first test pin and a second test pin respectively configured for connecting two output terminals of the crystal oscillator, the first test pin connected to a power source; a first and a second transistors each having a base, a collector, and an emitter, the collector of the first transistor connected to the first test pin, the base of the second transistor connected to the second test pin; an indicator, wherein the emitter of the first transistor is grounded via the indicator; a first diode, wherein the base of the first transistor is connected to a cathode of the first diode; and a first capacitor, a second capacitor, and a third capacitor, an anode of the first diode connected to the first test pin via the first and second capacitors one by one in series, the emitter of the second transistor connected to a node between the first and second capacitors, the collector of the second transistor grounded, the third capacitor connected between the base and the emitter of the second transistor.