User terminal tester

The utility model relates to a user terminal tester, which is characterized in that the utility model is composed of a switch, a protection unit, a switch A, a switch B, a detection unit, a voltage source B, a voltage source A and a processing unit, wherein the switch-in end of a telephone line is connected with the switch. After the switch is connected with the protection unit in series, the switch is connected in series with a parallel connection unit composed of the switch A, the voltage source A, the switch B and the voltage source B, then is connected with the detection unit and finally forms a complete circuit through the switch. The processing element is respectively connected with the switch, the switch A, the switch B and the detection unit. The utility model has the advantages that when the equivalent capacitance of a telephone is low or the non-linear characteristics is unobvious, the line fault can be accurately judged for reducing the maintenance cost during the outgoing of users. The circuit is simple, and the application is easy.