Analog Circuits Training - Wiring a Potentiometer to a Meter - Basic Voltage Circuit

img-20190725-095759.jpgIn this lesson you will wire a potentiometer to an analog voltage meter.  This is the first step in understanding how to vary the voltage of an analog signal.


Wire your potentiometer and meter according to the circuit diagram below.

Use the information to the right to help you identify the terminals.

When finished, continue on through this exercise.

The 5K potentiometer terminals are number from 1 to 3 from the left to the right.

1 - 0VDC

2 - (Called the wiper) Terminal 1 of the meter

3 - 24VDC

The meter reads both voltage and milliamps but we are only using voltage in this exercise.

1 - Terminal 2 of the potentiometer

2 - Milliamp + Not connected

3 - Milliamp - Not connected

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 Turn the potentiometer knob from from left to right and observe how it varies the voltage.

With the potentiometer in the counterclockwise position, the wiper has zero resistance to the 0VDC terminal of the potentiometer so the voltage is 0VDC. With the potentiometer in the middle position, near 12 o'clock, you will see around 12VDC or half of the available voltage. With the potentiometer fully counterclockwise, the wiper has zero resistance to the 24VDC terminal of the potentiometer so the voltage is 24VDC.
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That is the basics of how to vary a voltage signal to an analog input.  Now ask yourself if you fully understand how it works then continue on to the Analog Circuits Training - How Voltage Dividers Work and Calculating Resistor Values lesson.

Next Steps

Go to the Analog Circuits Training Lesson Series to select your next lesson.  There are also many other Lesson Series on PLC Programming and Industrial Automation.