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Measuring Instruments

True R.M.S Voltmeter Working and Theory

September 12, 2019August 12, 2019

In this instrument one amplifier first amplifies the input signal. Then it fads the amplified signal into the directly heated filament of a vacuum diode. The filament should have small thermal time constant to respond …

Read moreTrue R.M.S Voltmeter Working and Theory

Electronic Voltmeter Types of Electronic Voltmeter

October 22, 2019August 10, 2019

Electronic voltmeters use rectifiers, amplifiers and other circuit elements to produce a current. And this current is proportional to the voltage to be measure. A conventional voltmeter takes a non negligeable current from the circuit …

Read moreElectronic Voltmeter Types of Electronic Voltmeter

Electrodynamometer Type Synchroscope or Weston Synchroscope

September 19, 2019July 3, 2019

The Weston type synchroscope, which we also refer to as electrodynamometer type synchroscope is a type of dynamometer type instrument. Construction of Weston Type Synchroscope It consists of a lamp transformer. Lamp transformer is a …

Read moreElectrodynamometer Type Synchroscope or Weston Synchroscope

Saturable Core Frequency Meter Construction Working

August 24, 2019July 2, 2019

Construction of Saturable Core Frequency Meter There is a rectangular frame of magnetic material in a saturable core frequency meter. In between the yokes of this rectangular core, there will be two legs. One is …

Read moreSaturable Core Frequency Meter Construction Working

Moving Iron Type Synchroscope Construction and Working

September 11, 2019July 2, 2019

There are two types of synchroscope available in the market. These are moving iron type synchroscope and dynamometer type synchroscope. We shall discuss in this article the construction and working principle of moving iron type …

Read moreMoving Iron Type Synchroscope Construction and Working

Ratiometer Type Frequency Meter Construction Operation

August 24, 2019July 2, 2019

 Construction of Ratiometer Type Frequency Meter A ratiometer type frequency meter consists of a ratio meter. This ratio meter gives a relationship between the current ratio and the deflection. There are two coils in the …

Read moreRatiometer Type Frequency Meter Construction Operation

Weston Frequency Meter Construction and Working

September 12, 2019June 29, 2019

A Weston frequency meter is a moving iron type instrument. The action of this instrument depends on the variation of the current distribution in the parallel inductive and resistive circuits with a variation of the …

Read moreWeston Frequency Meter Construction and Working

Soil Resistivity Test or Soil Resistivity Measurement

September 19, 2019June 28, 2019

Needs of Soil Resistivity Test The soil resistivity test becomes the most prior activity for designing an underground earthing system. It becomes essential to construct a proper earthing system during the installation of an electrical …

Read moreSoil Resistivity Test or Soil Resistivity Measurement

Mechanical Resonance Frequency Meter (Vibrating Reed)

October 19, 2019June 27, 2019

Mechanical resonance type frequency meter is principally an electro-mechanical device. Also, we call this instrument the vibrating reed type frequency meter. Conceptually, the principal of this frequency meter is quite simple. The instrument consists of …

Read moreMechanical Resonance Frequency Meter (Vibrating Reed)

Rectifier Type Instrument Construction and Advantages

August 24, 2019June 26, 2019

A rectifier type instrument measures alternating electrical signal by means of D.C measuring instrument. As the name implies, this instrument first rectifies an A.C signal to D.C then measures. Although it measures the rectified A.C …

Read moreRectifier Type Instrument Construction and Advantages

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