Ohmmeter

November 1, 2021

The ohmmeter is an electrical measuring instrument , which is used to measure the resistance of a material to current. This tool has a battery or circuit that generates a constant current that is applied to the material and its resistance percentage is determined from it. Highly used in sectors where electricity is used.

What is an Ohmmeter?

As a measuring instrument, the Ohmmeter is named after Ohm’s Law, formulated in 1827 by the German scientist Georg Simon Ohm. It establishes a relationship between voltage, current and resistance where voltage is proportional to current and inversely proportional to voltage.

The Ohmmeter uses a galvanometer, which is an electric current meter. It works like a transducer, receiving the electric current and causing alterations in a pointer that is the one that indicates the measurement accordingly. This meter is used to determine the current flowing through the resistance and thus estimate it.

This instrument is portable and has wired terminations, although it may currently be included in another that performs different measurements. The resistance measurement is approximate, although much more accurate if you work with a circuit than with a battery and it is used in various sectors, as it helps to evaluate the operation of electrical appliances.

What is the Ohmmeter for?

The Ohmmeter is used to measure resistance, but what is this for? This can help you determine if an appliance is failing and is critical in the circuit building process. The Ohmmeter measures all resistances and therefore its use is extremely widespread.

How does an ohmmeter work?

The ohmmeter must be used correctly so as not to alter the measurement result. Before using it, it is essential that you know the language it uses or you will not be able to understand what it indicates. The volt is the intensity, the ohm is the resistance, the ampere is the number of electrons; With this clear, proceed to use the ohmmeter:

  • You must short-circuit their terminals
  • Set the needle indicating the measurement to “0”
  • Disconnect the power: the ohmmeter will supply the current to the circuit; an external energy will affect the measurement and may even affect the operation of the ohmmeter
  • The terminals are put on the object to be measured
  • The negative is identified with black and the positive with red, you must join negative with negative and positive with positive of the ohmmeter and the object to be evaluated
  • Turn on: when putting it into operation you must select the resistance and range that you want to measure

The ohmmeter setting is also a separate point that you must understand to make a good measurement. If you have an automatic one, you should simply adjust it to the “Ohm” position, if this is not the case, you should place it in the lowest position. You will probably need to adjust the scale, if so just make sure it is at a point where the values ​​are stable and there is a detectable resistance level.

Certain points to keep in mind when you make the measurement is that if you cannot adjust the ohmmeter to “zero” you must subtract the value that it marked from the result it returns. On the other hand, all bodies have a resistance, so if you measure an object that shows a very low one, keep in mind that the same ohmmeter will have one and will reflect it.

Uses of the Ohmmeter

The ohmmeter is commonly used to work in electrical circuits and thus measure resistance values. Its usefulness is indisputable, both in the home, the office, the industry, and in the laboratory. Either in the repair of electrical devices such as speaker coils or ceramic fuses.

Where there is an electrical circuit it is important to have this measuring instrument.

Knowing how an ohmmeter works will help you achieve reliable results. Whether you are a specialist or not, making good use of this instrument will allow you optimal handling.

Ohmmeter types

In the previous point, some specifications of use changed, if the ohmmeter was analog or automatic and there are different types. This is due both to the different needs and to the technological development that is increasingly looking for better and easier ways to use the tools, so below I will mention the main types:

  • Analogical

Its indicator is with water and needs to be calibrated frequently, an easy procedure to do as it has a screw that moves the needle allowing you to zero it.

  • Digital

It shows the data on a lcd screen being extremely practical, it has greater precision than the analog one. Some are more complex to use, but an advantage is the security measures they have.

  • Precision

This is different by the number of terminals, since it does not have two but four, two to carry the current as in the usual ones and the other two measure the voltage between the terminals.

  • Extreme precision

Needless to say, this one has more precision than the previous ones. These are the ones that use circuits instead of batteries to generate the current.

Many know an ohmmeter as a “multimeter” or “multimeter” because they measure not only resistance but also amps and voltage. The costs of these vary depending on the model, the higher the precision, the higher the cost, the more accessible being the analog. Each one in the same way is efficient and useful, you just need to find out which one would be more useful depending on the use.

Ohmmeter Features

The Ohmmeter may seem like a really complicated instrument at first but it is actually easier to use than it sounds, although it is something that you will experiment with using. Something that can help you is to familiarize yourself with its characteristics, so I introduce them:

  • Needle (for analog only): Indicates the measurement result
  • LCD display (automatic only): Performs the same function as the needle
  • Terminals : formed by cables and metal tips, they are those that carry out the transmission of voltage and allow measurement

The Ohmmeter comes in an easily transportable size and its appearance is a bit different depending on the model, although a guide to recognize it are the terminals and the function selector, which is where you configure it to do what you need.

Importance of an Ohmmeter

The ohmmeter is an instrument that can help you detect faults in your electrical appliances, as well as being vital for electricians and all those who work in that field. Determining the resistance of an object can also help you to categorize said material and use it in different uses in relation to it.

Measurement instruments are always necessary to be able to develop these fields of science and advance in the experimentation of new discoveries.

Dr. Loony Davis5
 | Website

Born and raised in Brussels in an English family, I have always lived in a multicultural environment. After several work experiences in marketing and communication, I came to Smart Water Magazine, which I describe as the most exciting challenge of my career.
I am a person with great restlessness and curiosity to learn, discover what I do not know, as well as reinvent myself daily, someone who is curious about life and wants to know. I enjoy sharing knowledge.
This is my personal project but I also collaborate in other blogs, it is the case, the most important web on water currently exists in the US, if you are interested you can read my articles here.

Leave a Reply

Your email address will not be published. Required fields are marked *