Iain, Scott, Sam

A multimeter is an electrical device that is used to measure different variables in electronics such as resistance, voltage, current and others. Some multimeters are capable of measuring capacitance, charge and more. Multimeters typically come with a range of settings allowing you to change the units and whether you are measuring AC or DC current.

Multimeter essential buttons and options

Using the Multimeter to test Circuits

Here is a brief tutorial on how to build the moisture tester. As well as a tutorial on testing and measuring components.

How to build the Moisture Tester

To test your moisture tester you will need to three wires, two of those wires will need to be connected to the battery clip.

• One wire will need to be connected to the positive input of the battery clip and the positive output of the power supply
• another wire needs to be connected to the negative input of the battery clip and the FUSE: 3A 250V (this is linked to the negative input of the multimeter)
• The last wire connects from the negative input of the multimeter to the negative output of the power supply

After connecting the wires to the power supply, multimeter and your circuit, you now need to turn on the power supply and multimeter and turn the voltage up to 9V on the power supply.

Then you need to make the multimeter read the current. You can do this by pressing the blue shift button and then pressing the DCI. Once you have selected the DCI you can adjust the range if the number is too small or too large. Depending on the range you will receive a more or less accurate result.