# How to Use the Digital Multimeter DT9205A

Written by michael o. smathers
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The DT9205A multimeter offers you several amplitudes of measurement with which to test electrical components for voltage, resistance or continuity. You can measure several different magnitudes of these quantities by adjusting the dial on the surface of the multimeter. The two most common uses for a multimeter are to test voltage and resistance. Using Ohm's Law -- the equation I=V/R, where I is current, V is voltage and R is resistance -- allows you to derive current.

Skill level:
Moderately Easy

### Things you need

• Electrical components

## Voltage

1. 1

Plug the leads into the appropriate sockets on the DT9205A multimeter. Plug the black lead into the COM socket and the red lead into the V socket on the bottom right side of the meter

2. 2

Turn the dial to the measurement you want. Voltage can be either AC or DC. According to the University of Colorado, AC voltage is represented by a circle with a wave symbol , and DC voltage is represented by a solid and dotted line. AC voltage measurements are in the lower right portion of the DT9205A multimeter, and DC voltage measurements are in the upper right portion.

3. 3

Turn the electrical component's power on and touch the lead probes to metal contact points on the component.

4. 4

Reverse the position of the leads if you get a negative reading.

## Resistance

1. 1

Turn off the multimeter, then turn off the power to the component.

2. 2

Switch the dial to the resistance section indicated by the Greek letter "omega" on the top portion of the dial. The letter "omega" resembles a horseshoe.

3. 3

Touch the leads to the contact points.

#### Tips and warnings

• For safety purposes, use the highest measurement on the dial. If you get no reading, you can lower the range.
• Ensure your multimeter is set to the proper measurement. Attempting to measure resistance and mistakenly leaving the power on at a component can damage the meter.
• Keep the probes clean and dry. Moisture lowers their resistance and can alter measurements

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