Encyclopedia Knowledge

Errors in Measurement Definition Errors in measurement are defined as the differences between measured values and true values. Static Error Formula Static error is calculated using the formula dA = Am – At, where dA is the error, Am is the measured value, and At is the true value. Limiting Errors Th

PMMC Meter Definition A PMMC meter (also known as a D’Arsonval meter or galvanometer) is defined as a device that measures the current through a coil by observing the coil’s angular deflection in a uniform magnetic field. PMMC Construction A PMMC meter (or D’Arsonval meters) is constructed of 5 main

What are Electrostatic Type Instruments? Electrostatic Instrument Definition An electrostatic instrument is defined as a device that uses static electrical fields to measure voltage, usually high voltages. Working Principle As the name suggests, electrostatic instruments use static electrical field

What is Moving Iron Instrument? Moving Iron Instrument Definition A moving iron instrument is a type of measuring device that uses the magnetic properties of iron to measure electrical quantities. Types of Moving Iron Instruments There are two main types, attraction and repulsion, which function bas

What is an Air Flow Meter Sensor? Air Flow Meter Definition An air flow meter is defined as a device that measures the rate of air flow in a duct or pipe. The rate of airflow is also known as the velocity or volume of air. Air flow meters can also measure the pressure and direction of airflow, which

What is an Electronic DC Voltmeter? Electronic DC Voltmeter Definition An electronic DC voltmeter is defined as a device that measures direct current (DC) voltage across any two points in an electric circuit using semiconductor components. DC Voltage DC voltage is a constant voltage from sources lik

Weston Frequency Meter Definition The Weston frequency meter measures frequency by using the deflection of a magnetic needle caused by perpendicular currents in two coils. Construction It includes two coils, three inductors, and two resistors arranged in a specific configuration. Circuit Diagram The

What are the Power Factor Meters? Power factor meter definition Power factor meters are devices used to accurately measure the power factor in AC circuits and are essential for industrial applications. Type of electric dynamometer This type of meter measures the power factor by using two coils (a re

What is a Phase Sequence Indicator? Phase Sequence Indicator Definition A phase sequence indicator is a device used to determine the phase order of a three-phase electrical supply. Types of Indicators There are two types—rotating type and static type, each with a distinct working principle. Rotating

What is the Meters Protection ? Meter Protection Definition Meter protection is defined as measures taken to safeguard electrical meters from damage due to overcurrent. Overcurrent Causes Overcurrent can occur due to incorrect connections, wrong meter ratings, or unexpected circuit conditions. Singl

What is the Vector Impedance Meter ? Vector Impedance Meter Definition A vector impedance meter is defined as a device that measures both the amplitude and phase angle of impedance in AC circuits. Measuring Amplitude and Phase Angle It determines the impedance in polar form by evaluating the voltage

What is Analog Multimeters? Analog Multimeter Definition An analog multimeter is a device used to measure electrical quantities like voltage, current, and resistance using a needle and scale. Working Principle It works on the d’Arsonval galvanometer principle. A needle indicates the measured value o