Page 119 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

MODULE 9: Electrical Meters and Calibration

EXERCISE 50 : To identify different types of electrical

measuring instruments

Objectives

At the end of this exercise you shall be able to
• check & identify the different types of Electrical meters used in AC & DC circuits.
• check & identify the scale, terminals and range of Electrical meters.
• understand connection of Electrical meters in Electrical circuits.
• connect & test the Electrical meters in simple electrical circuits and record readings.
• follow the safety measures while connecting the meters in high voltage & current circuits.
Requirements

Tools/Equipments/Instruments
• Combination (Plier 165mm, insulated) - 1 No. • Poly Ph. Watt meter, Analog
• Screw Driver (150mm, insulated stem) - 1 No. (3 KW, LPF, 600V) - 1 No.
• Neon Tester (75mm, 500 V) - 1 No. • 1 Ph. PF meter, Analog (10A, 230 V) - 1 No.

• Electrician knife (Insulated) - 1 No. • Frequency meter, Analog - 1 No.
(0-60 Hz, 230 V)
• Analog Voltmeter 1/2
(MI, 0-600 V, 0-300 V) - 2 Nos. • Multi meter (Digital, 3 digit) - 1 No.
• Analog Voltmeter Materials/Components
(MC, 0-300 V, 0-30 V) - 1 No. • PVC copper wire (1.5 sq.mm) - 2 m.
• Analog Ammeter (MI & MC, 10 A) - 1 No. • Test lamp (100 W, 230V) - 1 No.
• 1 Ph. Watt meter, Analog • DP switch (16 A, 230 V) - 1 No.
(2 KW, UPF, 230V) - 1 No.

Procedure

TASK 1 : Identify the different types of electrical meters
1 Collect the Tools, meters and materials required for experiment.
2 Draw the symbol & connection diagram of Electrical meters.
3 Check the scale, terminals and rating of Electrical meters
4 Check the resistance of shunt coil, series coil in voltmeter, ammeter and wattmeter.

5 Compare the scale & terminals of AC and DC meters.

TASK 2 : Connect and test the Electrical meters
1 Connect the ammeter in series with a load & supply, and measure the current in ammeter.

2 Connect the ammeter with different loads and measure the current.
3 Connect the voltmeter in parallel with supply OR load, and measure the voltage in voltmeter.
4 Connect the current coil terminals (M & L) of wattmeter in series with load, and potential coil terminals (C & V)
in parallel with supply OR load, and measure the power of load.

5 Connect the current coil terminals (M & L) of power factor meter in series with load, & potential coil terminals
(C & V) in parallel with supply OR load, and measure the power factor of different loads.
6 Connect the frequency meter in parallel with supply, and measure the frequency of AC supply.

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