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To construct and test the performance of a Basic Series inverter using SCR

Apparatus Required

  • Trainer kit- basic series inverter -1 No
  • Patch Chords - Sufficient Nos
  • CRO - 1 No
  • 10:1 CRO Probe - 1 No


Circuit diagram


CRO Settings

  • Time (X) Axis : 5ms/div
  • Voltage (Y) Axis: 20V/div
  • Probe: 1:10 CRO Probe is suitable one.


Initial Settings

  • Ensure the 230V Power Supply is in proper with Tester.
  • Ensure the CRO is working properly with probe checking and proper ground line axis.


Mimic Diagram

Precaution Steps

  • Switch ON SW2 and observe the pulse across the Triggering Pulse.
  • Switch ON SW1 and observe the DC Voltage across Vs.
  • Then Switch off SW1 and SW2.


Experiment Steps

  • The connections are made as per the circuit diagram given above.
  • When the load is Rheostat, then it must be in maximum position.
  • Turn on the SW2 and observe the waveform across between G1&K1 and G2&K2. And ensure it is like triggering pulse given in model graph.
  • Turn ON SW1 and observe the waveform across the R load.
  • Measure the X-axis time interval of ON time of Load Voltage and OFF Time of Load Voltage.
  • Adjust the value of Firing angle and note down the load voltage
  • Repeat the step 5.
  • Repeat the experiment for different values of α and note down Vo.


Note: *If the connections are wrong the kit will get damage. *Please switch off the Kit when not in use.

Model Waveform

a. PULSE for SCR

b. Across SCR

c. Output across Load



Total time (T)(ms)

F output(Hz)

SCR Off time(ms)






Model Calculation

F= 1/T  Where,

    F is output frequency,

    T is total time period (i.e) 360o

F= 1/ (5*10-3)

= 0.2*103

= 200Hz