The transistor characteristic tracer is mainly composed of a collector sweep generator, a base step generator, a synchronization pulse generator, an X-axis voltage amplifier, a Y-axis current amplifier, an oscilloscope tube, a power supply, and various control circuits. The main functions of each component are as follows:
(1) The main function of the collector sweep generator is to generate the collector sweep voltage, whose waveform is a half-sine wave, with adjustable amplitude, used to form the horizontal scanning line.
(2) The main function of the base step generator is to generate the base step current signal, whose step height can be adjusted, used to form multiple curve clusters.
(3) The main function of the synchronization pulse generator is to generate synchronization pulses to ensure that the signals of the sweep generator and the step generator are strictly synchronized.
(4) The main function of the X-axis voltage amplifier and the Y-axis current amplifier is to amplify the voltage signal (or current signal) taken from the device under test to the level required to drive the display screen, and then send it to the corresponding deflection plates of the oscilloscope tube to form a scanning curve on the screen.
(5) The main function of the oscilloscope is to display the test curve image on the screen.
(6) The power supply and various control circuits: the power supply provides energy for the whole machine, and the various control circuits facilitate test switching and adjustment.
Technical Specifications:
(1) Y-axis deflection factor:
Collector current range: 0.01～1000 mA/div, divided into sixteen ranges, error ≤±3%;
Collector current multiplier: divided into ×2, ×1, ×0.1 three ranges, error ≤±3%;
Base voltage range: 0.01～0.5V/div, divided into six ranges, error ≤±3%;
Base current or base source voltage: 0.05V/div, error ≤±3%;
External input: 0.1V/div, error ≤±3%;
(2) X-axis deflection factor:
