How to Use an Easy Multimeter Tester

In this issue, I will introduce testers (multimeters) that are often used in repair work. In addition to measuring voltage, current, and resistance, some testers can also check capacitance and continuity of capacitors.

There are two types of testers: analog testers, which read values by waving a pointer, and digital testers, which display values on a liquid crystal display. In this article, I will introduce functions that may be useful for modifying guitars, making your own shields, and more.

■ Voltage Measurement

Set the dial to “V” and apply the test stick to the desired measurement location. As an example of DC voltage, I will measure a 9V battery and an adapter. for a battery, measure it by placing the test stick on the + and - parts. 9V or higher is often the output. If you think the sound of the effector is strange, maybe try checking if the voltage is dropping.

Voltage measurement of 9V square battery

When measuring a power adapter (center minus), the inside of the plug is - and the outside is +, so you can measure by placing a test stick on each. In this case, I measured a 9V DC adapter.

Measuring the voltage of a power adapter

■ Resistance Measurement

Resistance can be measured simply by setting the dial to “Ω” and applying a test stick. Resistance has no +/- polarity. Resistance measurement can also be used to measure the disconnection of a guitar pickup. If the wire is disconnected, the resistance between hot and cold of the pickup will be infinite, so the tester will not display the resistance value but “O.L”.

■ Continuity check

Some testers are equipped with a continuity check function. A buzzer sounds if there is continuity. Even if the tester does not have a continuity check function, it is considered to have continuity if the resistance is displayed as almost 0Ω in the “Ω” mode.

Continuity check mode

This function allows you to check the core wires of the shield and the shield wires against each other to see if any wires are broken. This function is useful when making your own shield.

Checking the continuity of core wires

Checking the continuity of shield wires

The above is a brief but useful introduction on how to use a tester. If you are thinking of modifying your guitar or bass, or making your own effects pedals and shields, how about getting one?

Sound House also carries cable testers that can measure continuity just by plugging them in. If you make a lot of cables, we recommend this for a hassle-free process.