Make sure while selecting the emitter, base and collector terminals of the transistor.Do not switch ON the power supply unless you have checked the circuit connections as per the circuit diagram.Connect voltmeter and ammeter in correct polarities as shown in the circuit diagram.While performing the experiment do not exceed the ratings of the transistor.Increase in the value of I E causes saturation of the transistor of an earlier voltage.Smaller values if V CE, lower the cut-in-voltage.Output admittance 1/hoe = R o = I C / V CE (I B is constant)įorward current gain = hfe = I C / I B ( V CE = constant) Output Characteristics: To obtain output resistance find I C and V CB at a constant I B.Reverse voltage gain = h re = V EB/ V CE ( I B = constant) Input impedance = h ie = R i = V BE / I B ( V CE is constant)
Input Characteristics: To obtain input resistance find V BE and I B for a constant V CE on one of the input characteristics.Plot the output characteristics by taking V CE on X-axis and taking I C on Y-axis taking I B as a constant parameter.Plot the input characteristics by taking V BE on X-axis and I B on Y-axis at a constant V CE as a constant parameter.Observations: Input CharacteristicsInput Characteristics Repeat above procedure (step 3) for I B = 60♚, 0♚.Varying V CC gradually in steps of 1V up to 12V and note down collector current I C and Collector-Emitter Voltage( V CE).Keep emitter current I B = 20 A by varying V BB.Repeat above procedure (step 3) for V CE = 5V.Once the current starts increasing vary V BB in steps of 1V up to 12V. Step size is not fixed because of non linear curve.Varying V BB gradually, note down base current I B and base-emitter voltage V BE.Keep output voltage V CE = 0V by varying V CC.Connect the circuit as shown in the circuit diagram.It is plotted between V CE and I C at constant I B in CE configuration. Output characteristics are obtained between the output voltage and output current at constant input current. It is plotted between V BE and I B at constant V CE in CE configuration. Input characteristics are obtained between the input current and input voltage at constant output voltage. Here emitter of the transistor is common to both input and output and hence the name Common Emitter Configuration. The input is applied between base and emitter, the output is taken between collector and emitter. The basic circuit diagram for studying input characteristics is shown in the circuit diagram. To study the input and output characteristics of a transistor in Common Emitter configuration.ĭual DC Regulated Power supply (0 - 30 V)
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