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Electrical Measuring Instruments and their Uses [Complete Notes]

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This is the first article based on the Electrical Measurement & Instrumentation. In this post, I describe the major concepts of electrical measuring instruments in detail.

Topic of Contents

Before starting any electrical device installations or studying electronics practical, we should know the measurement and its measuring instruments.

This basic knowledge will help you throughout your electrical engineering.

Read it complete.

What is Electrical Measurement & Instrument?

Definition: In electrical, the instruments used to measure the resistance or current, voltage, frequency, flux, power factor, etc. are called ‘Electrical measuring instruments’.

These instruments are known as the ohmmeter, ammeter, voltmeter, frequency meter, flux meter, power factor meter, etc.

Electrical Parameter Meter Type
Resistance Ohmmeter
Current Ammeter
Voltage Voltmeter
Frequency Frequency Meter
Flux Flux Meter
Power Factor Power Factor Meter

In simple words, sometimes, the measuring instrument called as ‘Meter’.

Block Diagram of Measuring Instruments

Practically, the electrical measurement is a comparison between the actual measurement value and the standard value. The standard value is also called as ‘True value’.

After comparing, there can be some deviation called ‘error’.

The error is the deviation of the measurement value to the standard value. It is denoted by ‘ δ’.

Mathematically represent as,

Error = δ =  [(Am) - (At)]


‘Am’ is the measured value.

‘At’ is the standard value.

Note: When Am > At, the positive error occurs. And when Am<At, a negative error occurs.

These measurement values are measured in terms of numerical values.

There are different electrical companies manufacturing these electrical instruments.

Classification of  Electrical Measuring Instruments:

In electrical and electronic technologies, multiple types of instruments are used based on the studies, use cases, and the requirements.

The classification is based on the electrical quantities of parts, the nature of the operations, its purposes, its electrical supply, occurring effects, uses and many other terms.

Multimeters are a popular type of electrical measuring instrument. Like its name, it works like an ammeter, ohmmeter, and voltmeter to measure current, voltage, and resistance, respectively. With this single device, you can measure multiple units.

Multimeters are available into two forms.

  • Analog type Multimeter
  • Digital type Multimeter

In this advanced technology, both meters are used.

The analog type of multimeter shows the continuous signal. Whereas, digital type of multimeter shows the discrete signal.

Digital meter is also called as ‘Smart Meters’ or ‘Advance Meters’. It gives a more accurate, fast response and also displays the measuring units.

For more detail, I have classified the list of different types of electrical measuring instruments in another article. This covers all the classification with an explanation.

Necessity  or Uses of Electrical Measuring Instruments:

These measuring instruments are helping to determine the electrical quantities 0r the numerical values for the electrical appliances.

In the daily routine, instruments used in the lab, commercial, industrial, many more places.

In Generating Station and Substation, the most important purpose of the instruments is the data recording.

Apart from that, the following are some of the major use cases of electrical measuring instruments.

  •  To find out the unknown numerical values of the electrical quantities and for comparison with the standard values.
  • To find out the error in the measuring values in the circuit or system.
  • It helps to find out fault conditions and to protect the electrical appliances.
  • Measuring instruments are used for recording the data with respect to the time.
  • It is essential for displaying numerical values of the electrical quantities as per the time.
  • Electrical measuring instruments give an accurate and efficient reading for electrical equipment. Mostly, the digital meter is used for an accurate reading.
  • It is also used for safety purpose while electrical circuit development and testing in the lab.

Final Note: This is all from this post about Electrical Measuring Instrumentation. If you have any questions or point to discuss, write in the comment.

Happy Learning!

15 thoughts on “Electrical Measuring Instruments and their Uses [Complete Notes]”

  1. Electrical instruments or tools are used to find faults overtime of the electrical circuit. I find that very interesting and it makes sense cause the electricity will run through the circuit till it gets to the fault and just cut out. We can measure that and even find faults in that way. Thanks for these detailed notes.

  2. Good information about electrical instruments I want to learn more through you about electrical installations this is the cause I learn at college Called SCRIPTURE UNION OF TANZANIA (VTC) thanks dear

  3. Hi,

    Please, can you tell me about the types of electrical testing instruments about 5 to 10 with the aid of the diagram and the uses, range and disturbances?


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