Measurement Laboratory

Location: E-101

Faculty I/C: Prof. Raj Kumar Garg

Technician I/C: Mr. Vipan Kumar


About Measurement Laboratory:

This Laboratory is equipped with essential instruments which are able to give the understanding of basic principles of measurement systems. Students can understand the measurement of displacement with the help of potentiometer and the output waveform can be viewed by Cathode Ray Oscilloscope. Laboratory is also equipped with digital and analog instruments by which students can understand how digital instruments are more précised and accurate compare to their analog counterpart.

Various Instruments such as CRO, Function Generator etc. are kept open to visualize the working and signal flow path for measurements of electrical signaling. Various electrical bridges are there for understanding how the variation of capacitance, inductances and resistances are able to make the bridge in balance condition and measurements of electrical quantities are performed.

S. No. Equipment
1 Cathode Ray Oscilloscope (CRO)
2 Potentiometer
3 LCR Meter
4 Current Transformer (CT)
5 Potential Transformer (PT)
6 Wheatstone bridge
7 Kelvin bridge
8 Anderson bridge
9 Schering bridge
10 Flux meter
11 Wein bridge
12 Crompton’s Potentiometer


Rules and guidelines for conducting Lab-Work

  1. Students are not allowed to touch any equipment other materials in the Laboratory area until you are instructed by Teacher or technician.
  2. Before starting Laboratory -work follow all written and verbal instructions carefully, If you do not understand a direction or part of a procedure ASK YOUR CONCERN TEACHER BEFORE PROCEEDING WITH THE ACTIVITY.
  3. Before use equipment must be read carefully Labels and instructions. Set up and use the equipment as directed by your teacher ft you do not understand how to use a piece of equipment, ASK THE TEACHER FOR HELP!
  4. Perform only those experiments authorized by your teacher. Carefully follow all instructions, both written and oral. Unauthorized experiments are not allowed in the Laboratory. Students are not allowed to work in laboratory alone or without presence of the teacher. Any failure break-down of equipment must be reported to the teacher.
  5. Protect yourself from getting electric shock. Lab Safety- Guidelines Obtain authorization from the lab In-charge prior to entering the lab working area.
  6. Ensure that safety devices are adequate, appropriate and in good working order. Wear the appropriate personal protective equipment when conducting work With hazardous materials or procedures. Eye protection should be worn when performing tasks with potential to generate flying particles or debris.


DOs and DON’Ts in electrical and electronic Measurement Laboratory


  1. Come prepared and on time for laboratory experiments.
  2. Read all the instructions of the experiment carefully.
  3. Select the measuring instruments for the designated range of the equipments.
  4. Always wear tight dresses and rubber shoes in the laboratory.
  5. Make all the connections neat and tight.
  6. Always increase the voltage or current gradually.
  7. Use additional safety precautions for particular experiment, if any.



  1. Never touch any live terminal by bare hands.
  2. Never turn on the main switches of any experiment without getting checked the circuit by laboratory instructor.
  3. Never turn on any circuit at full supply voltage, even if the reading is desired at rated voltage.



  1. To understand the principle of operation of various types of electromechanical measuring instruments.
  2. (a) Use of multimeter for measuring voltage, current and resistance, inductance and capacitance.                        (b) Use of LCR meter for measuring inductance, capacitance and resistance.
  3. (a) To measure high value of DC current by a Low Range DC Ammeter and Shunt.                                                    (b) To measure high value of DC voltage by a Low Range DC Voltmeter and Multimeter.
  4. (a) To measure high value of AC current by a Low Range AC Ammeter and current transformer.                        (b) To measure high value of AC voltage by a Low Range Voltmeter.
  5. Measurement or unknown resistance using Wheatstone Bridge.
  6. Measurement or unknown resistance using kelvin’s Bridge.
  7. To measure active and reactivc power in 3-phase balanced load by one wattmeter method.
  8. To measure active power in 3-phase balanced and unbalanced load by two wattmeter method.
  9. Measurement of self-inductance using Anderson’s Bridge.
  10. Measurement of capacitance using Schering Bridge.
  11. Measurement of frequency using Wein’s bridge.
  12. Determination of frequency and phase angle using CRO.
  13. Measurement of unknown voltage using potentiometer.
  14. To find Q of an inductance coil and verify its value using Q meter.
  15. To analyze the working of current and potential transformers and to find out ratio error.
  16. To calibrate single phase energy meter by direct loading method.
  17. To measure the value of earth resistance.
  18. To measure power, power factor in single phase circuit using wattmeter and power factor meter and verify results with calculations.
  19. Measurement of power in a 3 phase circuit using Current Transformer (CT), Potential Transformer (PT) and 3 phase energy meter.
  20. Connecting appropriate instruments at the supply of an installation to measure supply voltage, frequency, power, maximum demand, phase sequencer and energy demand.
  21. Connection of 3 phase energy meter in an electrical system for measurement of energy.


Electrical Measurement Lab Manual

Video Demonstration(s) by Sr. Technician