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Digital multimeter
- 1. Directorate of Technical Education, Tamilnadu. ThanthaiPeriyar Government Institute of Technology, Vellore–632002 Department of ECE
- 2. Digital Multimeter Unit 5 Presentedby Mrs.M.P.Sasirekha
- 3. Contents • Definition • DMM •Parts of Digital Multimeter • Features • Block diagram • Measurement – voltage , Resistance , Diode , current . • Manufacturers • Reference • Thank you
- 4. Definition • Digital multimeteris 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
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- 6. Parts of DigitalMultimeter • A multimeter is a simple but useful device which has only three parts • Display screen • Selection knob • Ports. Next
- 7. Display screen • Displayscreen-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. NextDiagram
- 8. Selection knob • Selectionknob • 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. NextDiagram
- 9. Port • Port- Thereare 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. NextDiagram
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- 11. Features of DigitalMultimeter • Auto-Rang • A Back-Lit LCD • Auto-Off • Decent Probes • Auto Polarity Next
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- 13. Voltage Measurement byUsing 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
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- 15. Resistance Measurement byUsing a Digital Multimeter Next
- 16. Diode Check byUsing a Digital Multimeter Next
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