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 more
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 more
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 more
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 more
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 more
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 more
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 more
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 more
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 more
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 more