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# Using a digital multimeter (dmm)

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how to use a multimeter

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### Using a digital multimeter (dmm)

1. 1. Using a digital multimeter (DMM) A brief guide
2. 2. As a voltmeter (large voltages) • Switch to V = 20, this is the maximum DC voltage it will read • The red lead goes in the V socket • The black lead always goes in the COM socket • Now you are ready to measure voltage!
3. 3. As an ammeter (large currents) • Switch to 10A, this is the maximum current that will be read (wemay have to change this later) • The red lead goes in the 10ADC socket • The black lead always goes in the COM socket • Now you are ready to measure current!
4. 4. As an ammeter (smaller currents) • Switch to 20mA, this is the maximum current that will be read. If it says 2 its 2 mA • The red lead goes in the mA socket • The black lead always goes in the COM socket • Now you are ready to measure smaller currents!
5. 5. Measuring voltage • Voltage is the potential different between two point in a circuit (how much energy is carried by each charge) • Each charge gives up energy as it travels through a resistor • So voltage must be measured before and after a component
6. 6. Measuring voltage • If you want to measure the voltage across resistor 2 you have to connect the voltmeter like this • Don’t worry if you geta –ve number, its just connected the wrong way round
7. 7. Measuring current • Current is the flow of charge around a circuit, the faster the flow the higher the current • Current is the same all around a series circuit so place the current anywhere within the circuit to measure the current
8. 8. Measuring current • Current is measure in amps and the ammeter has the A symbol in a circle • Don’t worry if you get a –ve number, you have connected it the wrong way round. • It doesn’t make any different to the number