The triode output characteristic curve describes the relationship between UCE and lC under the condition that the base current IB is constant. Since the oscilloscope is a kind of voltage measuring instrument, the collector current can only be converted into voltage to be displayed by the oscilloscope. The CH2 channel measures the voltage drop across the sampling resistor as the oscilloscope's Y-axis input (IC), and the CH1 channel measures the collector voltage as the X-axis input (UCE). The oscilloscope operates in X-Y mode to measure the characteristic curve of the triode.
When the base current IB is a constant current (this design will achieve a stepping current source of: 25, 50, 75, 100, 125, 150, 175, 200 u A total of eight steps), at the collector By applying a synchronous sawtooth wave, the output characteristic curve of the transistor can be observed. Figure 1 is a system block diagram, which is mainly composed of a synchronization signal, a step current source circuit, a sawtooth wave circuit, etc.; FIG. 2 is a schematic diagram of an oscilloscope expanded into a transistor characteristic diagram.
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