VI Characteristics of SCR

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To Study and verify VI characteristics of SCR .Using VI characteristic of IGBT,MOSFET,SCR unit.

Apparatus required

VI characteristics of SCR kitc

☞Patch cards

☞Power card

Circuit Diagram

Circuit Diagram for VI Characteristics of SCR


Initial Settings

☞Ensure the 230V Power Supply is in proper with Tester.

☞Check the input supply of the kit and off the switches of the kit.

Mimic Diagram for SCR

Mimic Diagram for SCR

Experiment Steps

☞Connections are made as shown in the circuit diagram.

☞Switch on SW2 observe whether meter are reading 0.

☞Set both voltages to minimum position, and then switch on SW1.

☞Increase VAK voltage to maximum position.

☞Now slowly increase the voltage across VGK at certain voltage SCR is turned on stop varying the voltage at that point. Note: It may turn on around 3V.

☞Then reduce the voltage VAK to minimum position, don’t vary the VGK and Switch off SW1.

☞Now Switch on SW1 then note down the readings.

☞Now vary VAK voltage slowly, correspondingly note down the VAK and IA readings and plot the graph.

☞Repeat from step 2 for another value of gate current IG.

Note: If the connections are made wrong the kit may get damaged. Please switch off the kit when not in use.


IG = ………………….mA


Model Graph

Model Graph VI Characteristics of SCR

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