Forging new generations of engineers. Digital Multimeter.

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Presentation transcript:

Forging new generations of engineers

Digital Multimeter

What is a Digital Multimeter? A digital multimeter is highly accurate and provides LCD number readouts. It can easily measure AC / DC voltage, resistance, and current.

Test leads are used to connect the multimeter to the circuit to be tested. Test Leads

Function/Range Switch DC Voltage Battery Test DC Current AC Voltage Resistance Continuity Test

Voltage Meter The volt meter is used to measure the voltage potential across a component in an active circuit. Can be used to measure either DC or AC voltages. AC voltage can ONLY measure sinusoidal (SINE) waveforms.

Test Lead Connections - Voltage Plug the RED test lead into the jack labeled V/  and the BLACK test lead into the jack labeled COM (common).

Ohm Meter The ohm meter is used to measure the resistance of a component. NO POWER can applied to the component being tested. The ohm meter actually applies a small voltage and uses ohms law to calculate the resistance from the measured current.

Test Lead Connections - Resistance Same As Voltage Measurement

Ampere Meter The amp meter is used to measure the current through a component in an active circuit. Can be used to measure only DC current. Some multimeters can also measure AC current

Test Lead Connections - Current Plug the RED test lead into the jack labeled mA for milliamps or into the jack labeled 10A for circuits with high current levels. Plug the BLACK test lead into the jack labeled COM. Be certain to select the range according to the test lead connections. Observe proper polarity.

Basic Instructions Be sure the test leads are connected properly for measurement being made. Turn the meter’s Function/Range switch to the function (ACV, DCV, DCA or  ) setting you are measuring. Select at a range which is higher than the expected value. Connect the test leads to the circuit/component begin tested. Observe proper polarity. Turn the meter’s Function/Range switch to reduce the range and increase the accuracy. Record results. Remember to turn the power OFF.

Special Functions Continuity Tester Used to test the continuity between two points. Will produce an audio tone. Diode Tester Used to test the resistance in a diode for forward bias and reverse bias. Battery Tester Used to test 9 volt and 1.5 volts (AAA,AA, C, D) batteries.

If the Meter Malfunctions : Check battery. Review instructions to make sure you are doing it properly. See if test leads are broken or not connected properly. Inspect and test the fuse.