Tester for the power diode and thyristor reverse recovery charge Qrr measurement

This tester allows for measurement of reverse recovery charge Qrr of both: structures and finished power diodes and thyristors. Tested structure or finished element is placed in the external press which is connected to the tester.
Tester generates trapezoid-shape current test impulse with the independent regulation of its rise di/dt rate, maximum value and its duration and fall di/dt rate. Reverse recovery charge is calculated by a computer on the basis of the reverse current waveform of the tested element with three methods. Tester allows for a Qrr measurement with a current impulse up to 5000A and 2000 μs duration. Maximum measured value of the reverse current Ir is 1000A and the measurement time is limited to 100 μs. Tests are performed automatically after entering parameters to the computer. Those parameters can be obtained automatically from the external computer or manually entered by an operator. Tester operation is controlled by a computer equipped with measuring and control boards. Measuring board registers current and voltage waveforms and the computer makes an assessment based on the criteria specified in the test recipe. Tests results are displayed on the computer screen in digital form as well as a parameter diagram in the time function.
Computer software allows realization of the test cycle, detects and localizes failures, allows for separate control of every component and validates tester operation after the maintenance.
Tester is operated with a touch screen, keyboard, mouse, control buttons and signal lamps. During the test the only thing that an operator needs to do is to exchange tested elements in the press.

Tested elements	Screen display

Technical Data