![]() ![]() The wires should plug into the multimeter into the socket marked "COM" (the negative terminal) and the socket marked with a "V." These wires should then plug into the power supply on top of the wires to the light bulb ("piggy-back" style). ![]() Make sure the power supply is turned all the way down (the control knob should be rotated fully counterclockwise).Ĭaution: DO NOT turn the power supply much past the halfway point-setting the voltage higher than this easily damages the bulbs! Turn the multimeter on, set it to measure DC Volts and plug in wires from the meter to the power supply. Measuring Voltage First set up a simple circuit by connecting the small light bulb to the power supply with two banana plug cords. Resistance is the opposition to current flow measured in units of Ohms. Current is the amount of electricity flowing through a circuit segment measured in units ofĪmperes, or Amps. Voltage is the difference in electrical potential between two points in a circuit measured in units of Volts. How to Use the DMM In this segment, we'll be measuring voltage, current, and resistance with a digital multimeter. The accuracies of the multimeters are provided in the appendix. Your lab instructor can assist you if you need help replacing either a fuse or a battery. If your multimeter takes a long time to stabilize when reading a voltage, the battery may be low (indicated by the "low battery" symbol on the display). If you find that your meter is not functioning properly, you can check the integrity of the fuse by using another multimeter to measure the resistance of the ammeter circuit (which should be only a few ohms, not "OL" for overload or infinite resistance, which usually indicates that the fuse has been blown and needs to be replaced). ![]() If you are ever unsure about the amount of current in a circuit, it is always best to use the higher 10 A connection first to avoid damaging the meter or blowing the fuse for the lower 300 mA connection. The "300 mA" jack is for measuring currents less than 300 mA, and the "10 A" jack is for measuring currents greater than 300 mA but less than 10 A. To measure AC or DC currents, use the "10 A" or the "300 mA" jack and the "COM" jack. To measure DC volts, AC volts, and ohms, use the two jacks labeled "VΩ" and "COM." When measuring voltages, the "VΩ" jack (red) is positive and the "COM" jack (black) is negative. These are used to connect the object being measured to the multimeter. Figure 1 At the bottom of the multimeter are four jacks. ![]()
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