How to Use a Fluke Multimeter

If you have an electrical malfunction on your hands, there is only one way to determine its source with maximum efficiency, and that is to use a multimeter. Multimeters measure various electrical properties, including current, resistance and both AC and DC voltage. These instruments can be used by both professional electricians and the general public, and if you choose a Fluke multimeter, you can rest assured that you’re using the very same tool that the pros rely on. Whether you invest in a brand new multimeter or find a discount Fluke multimeter online or at a bargain electronics retailer, you’re going to need to know how to use it effectively – and safely. Here are some hints:

• Measuring Voltage: Begin by plugging the probes into the corresponding jacks on the multimeter; keep in mind that black is negative and the red should go only to the volt/ohm/temp jack. If you’re measuring AC voltage, simply turn the dial to the “V” with a wavy line over it; to measure DC voltage, turn the dial to the “V” with a solid and a broken line over it. Finally, touch the probes to the outlet or wire you wish to monitor.
• Measuring Resistance: Start the same way as you would to measure voltage, but turn the dial to the “Ohm” sign. Then touch the probe tips together and read the resistance of the leads. You should be aware of the fact that the measured value of a resistor can differ from its rated value, usually by 0.1% to 0.2%.
• Measuring Current: Of the three uses for your Fluke multimeter, measuring current is the one that carries the greatest potential for danger. Before attempting this measurement, make sure to take all necessary safety precautions in order to avoid electrocution or serious damage to the meter. First, never attempt to make a measurement if the open-circuit potential to earth is greater than 1000 volts. Always check the fuses on your meter before beginning your measurement, and take care to use the proper terminals, function and range. Finally, never place the probes parallel to any circuit or component. Once these safety measures have been carried out, you’re ready to begin! Turn off the power to the circuit and discharge high voltage capacitors. Then, insert the black lead into the COM terminal for currents between 6 mA and 400 mA, or insert the red lead into the A terminal for currents above 400 mA.

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