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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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