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The device for testing transistors "PPT" since 1982 produced the Kursk plant "Mayak". The device allows you to check all the parameters of low and medium power transistors. PPT makes it possible to detect the malfunction of the transistor in the circuit. PPT determines: For low and medium power transistors: DC gain p. Jko collector reverse current. For high power transistors: Make a comparative estimate of the gain of different transistors. Determine the reverse current collector Jko for transistors, in which the current Jko does not exceed 100 μA. The error in determining the DC gain is no more than 50% of its nominal value. The measurement error can be reduced to 5% by connecting an external power source with the voltage specified in the passport of the transistor being tested. The error in determining the reverse current of the Jko collector meets the requirements of the device specification not exceeding 5 μA. The power supply PPT comes from the battery 3336U with a voltage of 4.5 V. The price of the device is 20 rubles 80 kopecks.