What Are Transistor Characteristics?

The transistor characteristic grapher is a special oscilloscope that can directly observe various transistor characteristic curves and curved clusters. For example: the input, output and feedback characteristics of the three common connection methods of the transistor, common base and collective; Breakthrough voltage, saturation current, self or a parameter, etc.

(L) Y-axis rotation factor:

Transistor Characterization Grapher

To test with this instrument "

1. After connecting the power cord of the instrument, turn on the power switch of the instrument, connect the relevant test fixture, and warm up for 10 minutes.

2. Use the "Brightness" adjustment knob to adjust the brightness of the light in the display of the instrument to an appropriate state, but not too bright, so as not to damage the oscilloscope; use the "Focus" and "Focus Assist" knobs to adjust the light as small as possible , Clear, to improve the accuracy of reading; by moving the knob up and down and left and right to adjust the light to the middle of the bottom horizontal line of the screen, and coincide with the bottom line to facilitate reading during testing.

3. According to the requirements of the test conditions of the triode to be tested, combine the relevant knobs and buttons on the instrument panel to set the relevant test conditions.

4. Insert the triode to be tested into the port of the test fixture with the corresponding polarity. At this time, the instrument displays a figure similar to the following figure:

5. Read the magnification test value.

Because the magnification of the triode = IC / IB, you must read the IC value and IB value to calculate the magnification. The current / degree knob on the instrument panel is set to the value of each division of the IC. The "current-voltage / stage" knob sets the value of each stage of IB. The IC value is read by the number of vertical grids of the graph, and the IB value is read by the number of waveform levels. Assume that the test waveform in the figure above is taken as an example: The value set by the "current / degree" knob is 10mA. The value set by the "current-voltage / level" knob is 1mA. It can be seen from the waveforms in the figure above that the number of ordinates occupied by the waveform is 3.4 and the number of levels of the waveform is 2. Therefore, the magnification is calculated as follows:

= IC / IB = (10mA × 3.4 division) ÷ (1mA × 2 level) = 34mA ÷ 2mA = 17

6. If you need to continue the test, repeat steps 4-5, and turn off the power of the instrument after the test. ^[4]

1. When the test tube is inserted into the test port, it must correspond to the polarity, so as not to damage the performance of the component.

2. During the MOS tube withstand voltage test, the test port will have a high-voltage output. Do not use any part of the human body to contact the test port and the pin of the component under test to prevent electric shock.

3. Always keep the instrument and test fixture clean to reduce or eliminate test errors caused by excessive dust in the test port.

4, when the test error of the instrument is large or other failures should be reported in time.

Transistor characteristics plotter can be used to determine the input characteristics, output characteristics, conversion characteristics, , parameter characteristics of the common collector, common base, and common emitter of the transistor; it can measure various reverse saturation currents ICBO, ICEO, IEB0 And various breakdown voltages BUCBO, BUCEO, BUEBO, etc .; It can also measure the characteristics of diodes, zener diodes, thyristors, tunnel diodes, field effect transistors and digital integrated circuits, and has a wide range of uses.