Digital multimeter

Digital multimeter

1. Directorate of Technical Education, Tamilnadu . Thanthai Periyar Government Institute of Technology, Vellore–632002 Department of ECE

2. Digital Multimeter Unit 5 Presented by Mrs.M.P.Sasirekha

3. C ontents Definition DMM Parts of Digital Multimeter Features Block diagram Measurement – voltage , Resistance , Diode , current . Manufacturers Reference Thank you

4. Definition Digital multimeter is a test equipment which offers several electronic measurement task in one tool. It is also known as the voltmeter or Ohm meter or Volt Ohm meter. The standard and basic measurements performed by multimeter are the measurements of amps, volts, and ohms. Apart from that, these digital multimeters perform many additional measurements by using digital and logic technology. These may include temperature, frequency, continuity, capacitance etc. Next

5. DMM Next

6. Parts of Digital Multimeter A multimeter is a simple but useful device which has only three parts Display screen S election knob Ports . Next

7. Display screen Display screen-It has illuminated display screen for better visualization. It has five digits display screen; one represent sign value and the other four are for number representation. Next Diagram

8. Selection knob Selection knob As we know a single multimeter performs so many tasks like reading voltage , resistance , and current . The selection knob allows the user to select the different job. Next Diagram

9. Port Port- There are two ports on the front of the unit. One is the mAVΩ port which allows the measurement of all the three units: current up to 200 mA , voltage, and resistance. The red probe is plugged into this port. The other is COM port which means common and it normally connected to – ev of a circuit and black probe is plugged into it. There is one particular port is 10A, which is use to measures large current in the circuit. Next Diagram

10. Ports Next

11. Features of Digital Multimeter Auto-Rang A Back-Lit LCD Auto-Off Decent Probes Auto Polarity Next

12. Block diagram Next

13. Voltage Measurement by Using a Digital Multimeter When set to measure the voltage, the multimeter acts like a voltmeter . To start with, one has to insert the red and the black probes of the multimeter to the sockets marked as ‘V’ and ‘COM’, respectively. Then we have to select the expected range in which our voltage would be. Simultaneously, even AC or DC should also be selected in the voltmeter section of Figure . Diagram Next

14. Diagram Next

15. Resistance Measurement by Using a Digital Multimeter Next

16. Diode Check by Using a Digital Multimeter Next

17. Current Measurement Next

18. Reference https://www.electrical4u.com/digital-multimeter/ https://www.electrical4u.com/how-to-use-a-digital-multimeter/ Next

19. Different Manufacturers https://www.google.com/search?sxsrf=ALeKk03rVR3G0cnJ7YXpbNeSgB6q3voFBA:1589153833298&q=types+of+manufacturers+of+DIGITAL+MULTIMETER&spell=1&sa=X&ved=2ahUKEwi9jOitu6rpAhUBxDgGHc_IARgQBSgAegQIDhAn&biw=1356&bih=645 Next

20. Thank you