Monday, February 4, 2013

Calibration and Testing Of Single Phase Energy Meter

Aim :
To calibrate the given 1-φ energy meter using a precession wattmeter and stopwatch using or employing phantom loading.

Apparatus :

Circuit Diagram :-

Procedure for calibration and testing of 1-φ energy meter:-
  1. Give the connections as per the circuit diagram above.
  2. Apply 220V A.C to the pressure coil circuit by means of phase shifting transformer.
  3. Apply a load of 2 Amps by switching on the load.
  4. Note down the reading of two meters in a given period of time, say 2 minutes.
  5. Find out the percentage error at this load.
  6. Now rotate the rotor of phase shifting transformer so that the working power factor (p.f) of the meter is varied.
  7. For this power factor repeat steps 4 and 5.
  8. Now increase the load current in suitable steps and repeat the steps 4,5,6 and tabulate the results.
Tabular Form :-
S.No Current I(A) Power Factor Wattmeter (w)x2 Time (T) in Hours Measured Power (Whr) % error

Formaula Use And Calculations :


  1. interesting blog. It would be great if you can provide more details about it. Thank you...

    Temperature calibration