Introduction Introduction Specification of Instruments Used

• 2 D.C Ammeters
  1. 0 – 2.5A/5A (Test)
  2. 0 – 5A/10A (Standard)
• Rheostat 100 Ω / 5A Rating
• Load Box 0-20A in steps of 1A, 110V Rating
• 2 D.C Voltmeters
  1. 0 – 75V/150V (Test)
  2. 0 – 75V/150V (Test)

]]> Ammeter Calibration Step 1

• Make the connections using the board as per the schematic circuit diagram.
• When the connections are complete, connect the power supply and then switch on the power.

]]> Step 2

• With no load applied, check whether the test ammeter has any zero error.
• Adjust R₁ (LoadBox) and R₂ (Rheostat) to get the pointer of the test ammeter on desired markings on its scale. Note the corresponding reading in standard ammeter.

]]> Voltmeter Calibration Step 1

• Connect the meters as per circuit diagram.
• Correct the voltmeters for zero errors, if necessary.

]]> Step 2

• Check  whether the voltmeter has any zero error.
• Adjust R using slider of the rheostat to get the pointer of the test voltmeter on desired markings on its scale.
  Note the corresponding readings in standard voltmeter.
• Perform the same procedure until the full scale of the test voltmeter is reached.

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