There are some problems that arise when performing maintenance or electrical installation that we can easily solve by doing only the continuity test using a multimeter. Thinking about it we decided to talk about what the continuity test is for and how it works, besides teaching some incredible tips that will help you a lot to solve certain problems, come on guys!
Continuity test: What is it?
As the name implies, the continuity test allows us to check whether there is continuity in the conductor connections and can be used to perform tests on electrical and electronic circuits.
The continuity test is nothing more than a resistance test if the resistance is extremely high, that is, open circuit, nothing happens, but if the resistance is zero, we consider it as a continuous circuit, and in this situation, the multimeter emits a signal sonorous.
Continuity test: Applications.
The continuity test can be used to check whether there is continuity between the electrical conductors along their entire path, whether the electrical conductors are correctly connected and can be used to identify electrical cables in circuits, printed circuit tracks, contacts of contactors and switches for example.
How to use a continuity test?
Performing the continuity test is very simple, but before doing the test, it is important to note that the continuity test uses the multimeter’s internal battery as a power source, so when performing the continuity test it is essential to de-energize the circuit or turn off the component to be tested, that is, we must never perform this test on energized circuits or components!
After having de-energized the circuit or turned off the component, fit the test leads correctly, pay attention to other multimeters that have more than two terminals to connect the test leads.
To do the continuity test we must adjust the scale of the multimeter to the continuity scale, which is represented with a symbol similar to that of wifi. Some multimeters have the continuity scale separated from the others, but there are other multimeters that together with the continuity scale have other scales together, such as resistance and test for diodes, in these cases it is necessary to choose the scale using another button.
As soon as the multimeter is adjusted for the continuity scale, observe on the device’s display that when the tips are not touching, the reading indicates infinity or OL, which means open circuit, no current is able to flow through this circuit.
When the test leads come into contact with each other, the reading indicates the value zero, that is, it means that the circuit is closed. In this situation, the multimeter emits an audible warning signal, whenever the alert signal is being emitted, it means that the circuit or cable has continuity, it is not broken.
To perform the continuity test on an electrical conductor or resistor, we must touch a probe on one end of the resistor and the other probe on the other end. If the circuit is closed, the reading will be zero and the device must be heard. The test will work in the same way to check the connection of a circuit or switch operation for example.
If when performing the continuity test on the resistor, switch or electrical conductor, and indicate on the display open circuit, it means that the resistor is burnt out, the switch is open and the electrical conductor is broken.
The video below explains exactly how the continuity test works, in addition to teaching some usage tips that can help identify flaws, solving problems in a simple way.
We finished one more article and hope to have helped clarify what the continuity test is for and how we can use it. If you have any questions or curiosity about the subject, leave it in the comments and we will answer it!