What is ohmmeter?

What Does ohmmeter Mean

An ohmmeter is a device used to measure electrical resistance in a circuit . As the name implies, the ohmmeter records ohms .

General description
Ohm is called , meanwhile, the electrical resistance between two sectors of a conductor when, in said conductor, a constant potential difference of one volt applied between these two sectors generates a current of one ampere . The symbol for ohm is Ω .

The analog ohmmeter displays the values ​​using a needle

Also called an ohmmeter , the ohmmeter allows knowing the electrical resistance by applying a potential difference between its terminals. This is possible thanks to the existence of an internal battery in the device. If there is no resistance, the ohmmeter reaches its maximum reading. In this way, when placing the resistance to be measured between its terminals, the voltage drops and the needle of the analog ohmmeter moves until the corresponding value is marked.

The resistance scale , in this framework, grows from right to left. This means that the ohmmeter needle, at its maximum reading, is on the right. As the tension drops, the needle moves to the left.
Types of ohmmeters
As with almost all tools that were created several decades ago, technological advances and the changing needs of users have led to the creation of different types of ohmmeters. Broadly speaking, we can say that with the passage of time increasingly accurate and user-friendly versions are created.
Let's start with analog, some of whose characteristics we already mentioned in the previous paragraphs. We can distinguish it at first glance because it has a needle and many inscriptions on its indicator, similar to the design that we find in the old pharmacy scales for the weight of people. The movement of the needle can be carried out with the help of a screw that allows us to move it to zero.
In the case of the digital ohmmeter , the instrument is usually associated with an ammeter and a voltmeter , thereby constituting a multimeter . These devices exhibit its result on a screen of liquid crystal, without the user having to interpret the indication of the needle. While it may be more difficult to use than analog, it is also more accurate and has more effective security measures.

On the other hand, there is the precision ohmmeter , which has two more terminals than the previous ones: two of them are in charge of transporting the current, just as it happens in the normal ones; the remaining two, instead, are used for measuring the voltage between them. The extreme precision , finally, use circuits instead of batteries for the production of current.

Digital models are more accurate
A fundamental tool
Thanks to the ohmmeter we can detect failures in the devices, something that can make the difference between a timely repair and the total loss of them or even others that are connected to the same electrical network. On the other hand, people dedicated to the field of electricity have it among their essential instruments .
With it we can also determine the resistance of a material and categorize it to use it in the most appropriate way. This means that the measurement is not only used in the field of repairs , but also in the research and development of new technologies, new appliances and even new versions of the ohmmeter.
Differences with the multimeter
It should be noted that the multimeter is a more complete element than the ohmmeter. While the ohmmeter measures electrical resistance , the multimeter can also measure voltage and current , for example.

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