introduction to electrical measuring instruments.pptx

electrical measurement

1. INTRODUCTION TO ELECTRICAL MEASURING INSTRUMENTS Prepared by: Ms. Parneet Kaur Chowdhary Lecturer, Electrical

2. INTRODUCTION TO ELECTRICAL MEASUREMENT INSTRUMENTS VOLTMETER AMMETER WATTMETER ENERGY METER OHMMETER MULTIMETER CLAMP METER M EGGER

3. VOLTMETER Voltmeter is an instrument, which used for measuring the potential difference, or voltage, between two points in an electrical or electronic circuit. It is also known as a voltage meter. Analog Voltmeter Digital Voltmeter

4. VOLTMETER Also we can observe that the Voltmeters can be AC or DC depending upon the type of voltage to be measured. The symbols shown below help us to differentiate between AC and DC meters AC Voltmeter DC Voltmeter

5. AMMETER An ammeter is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes, hence the name. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters (mA) or microammeters ( μ A). Ammeter Milliammeter Microammeter

6. AMMETER Also we can observe that the Ammeters can be AC or DC depending upon the type of current to be measured. The symbols shown below help us to differentiate between AC and DC meters AC Ammeter DC Ammeter AC/DC Ammeter

7. WATTMETER The wattmeter is an instrument for measuring the electric power in watts of any given circuit. 

8. ENERGY METER An electricity meter, electric meter, electrical meter, or energy meter is a device that measures the amount of electric energy consumed by a residence, a business, or an electrically powered device. Electric utilities use electric meters installed at customers' premises for billing and monitoring purposes. Electromechanical Energy meter Digital Energy meter

9. OHMMETER An ohmmeter is an electrical instrument that measures electrical resistance. Micro-ohmmeters make low resistance measurements. Megohmmeters measure large values of resistance. The unit of measurement for resistance is ohms. Ohmmeter Megohmmeter Micro Ohmmeter

10. MULTIMETER A  M ultimeter  or a multitester , also known as a VOM (volt-ohm- milliammeter ), is an electronic measuring instrument that combines several measurement functions in one unit. A typical  M ultimeter  can measure voltage, current, and resistance. 

11. MULTIMETER

12. CLAMP METER In electrical and electronic engineering, a current clamp, also known as current probe, is an electrical device with jaws which open to allow clamping around an electrical conductor.  This allows measurement of the current in a conductor without the need to make physical contact with it, or to disconnect it for insertion through the probe . Probes measure voltage. 

13. MEGGER Megohmmeter or insulation resistance tester is a special type of ohmmeter used to measure the electrical resistance of insulators. Insulation resistance is resistance in ohms of wires, cables, and electrical equipment, which is used to safeguard the electrical systems like electrical motors from any accidental damages like electrical shocks or sudden discharges of current leakages in wires. Hand-operated Megger Electronic Megger

14. LET’S REVISE Sr. No. Electrical Parameter Measuring Instrument 1 Voltage Voltmeter 2 Current Ammeter 3 Power Wattmeter 4 Energy Energy Meter 5 Resistance Ohmmeter 6 Voltage, Current and Resistance Multimeter 7 Voltage, Current and Resistance Clamp Meter 8 Insulation Resistance Megger