• Digital Multimeters

    Multimeter ReadingRecently I was working on a house that someone else had rewired. I was trying to install 2 lights above the bathroom sink using the preexisting wiring. To make sure that I knew which wire was for what I went out to my truck and retrieved my digital multimeter.

    A multimeter is used to make various electrical measurements, such as AC and DC voltage, AC and DC current, and resistance. It is called a multimeter because it combines the functions of a voltmeter, ammeter, and ohmmeter. Multimeters may also have other functions, such as diode and continuity tests.

    I used the beeper function which allowed me to tell which was the incoming line and how it was wired to the light.

    Next, I tried to verify that I was getting 115v to the light. I found that I was only getting 50v, so I then used the multi-meter to check the resistance value and found that I had a bad switch.

    Once I had tested each of the wires, it was an easy job to wire the lights, and switches.

    The multi-meter is an invaluable tool when working with electrical currents.

    Always make sure that you use the correct safety equipment, and turn off the power.

    • Also follow these safety tips:
    • Be sure the test leads and rotary switch are in the correct position for the desired measurement.
    • Never use the meter if the meter or the test leads look damaged.
    • Never measure resistance in a circuit when power is applied.
    • Never touch the probes to a voltage source when a test lead is plugged into the 10 A or 300 mA input jack.
    • To avoid damage or injury, never use the meter on circuits that exceed 4800 watts.
    • Never apply more than the rated voltage between any input jack and earth ground (600 V for the Fluke 73).
    • Be careful when working with voltages above 60 V DC or 30 V AC rms. Such voltages pose a shock hazard.
    • Keep your fingers behind the finger guards on the test probes when making measurements.
    • To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator appears.
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