To ensure the proper use of the instrument, neither damaging the transistor under test nor the internal circuits of the instrument, the following precautions should be noted before using the instrument:
1. Have a general understanding and estimation of the main DC parameters of the transistor under test, especially the maximum allowable collector power dissipation PCM, maximum allowable current ICM, and breakdown voltages BVEBO, BVCBO.
2. Select the appropriate polarity of the sweep and step signals to suit different transistor types and test requirements.
3. Choose an appropriate sweep voltage range based on the parameter to be measured or the allowable collector voltage of the transistor under test. Generally, adjust the peak voltage to zero first, and also do so when changing the sweep voltage range. Select a certain power dissipation resistor; when testing reverse characteristics, choose a larger power dissipation resistor, and set the X and Y deflection switches to appropriate positions. During testing, gradually increase the sweep voltage from zero to the required value.
4. Perform necessary estimations for the transistor under test to select the appropriate step current or step voltage. It is advisable to start with a smaller value and then gradually increase as needed. During testing, do not exceed the maximum allowable collector power dissipation of the transistor under test.
5. When testing ICM, it is generally recommended to use a single cluster to avoid damaging the transistor under test.
6. When testing IC or ICM, select based on the actual collector voltage conditions, and do not exceed the maximum current specified for this instrument.
7. When performing high-voltage tests, pay special attention to safety. The voltage should be gradually increased from zero to the required value. After observation, promptly adjust the peak voltage back to zero.
Basic Operating Steps
1. Press the power switch, the indicator light will turn on. After warming up for 15 minutes, testing can be performed.
2. Adjust the brightness, focus, and auxiliary focus to make the spot clear.
3. Turn the peak voltage knob to zero, and set the peak voltage range, polarity, power dissipation resistor, and other switches to the positions required for the test.
4. Perform a 10-degree calibration on the X and Y axis amplifiers.
5. Adjust the step zero.
6. Select the desired base step signal, set the polarity and series resistor to appropriate positions, adjust the step/cluster knob to make the step signal 10 steps per cluster, and set the step signal to the repeat position.
7. Insert the transistor under test, slowly increase the peak voltage, and a curve will be displayed on the screen.
