types with Construction, Working Principle
Subject and UNIT: Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation
For measuring a large current in a d.c. circuit, we use low-range ammeter with a suitable shunt. The measurement of high d.c. voltage is made using a low-range voltmeter with a multiplier.
Single Phase Induction Type Energy Meter, Three-Phase Watthour Meter
Subject and UNIT: Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation
The measurement of energy is the same process as measurement of power except that the instrument not merely indicates the power or rate of supply of energy but must take into account also the length of time for which the rate of energy is continued.
Methods
Subject and UNIT: Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation
In ac circuits, power is measured with the help of wattmeter. A wattmeter is an instrument, which consists of two coils called the potential coil (PC) and the current coil (CC).
Types, Construction, Working Principle, Torque Calculation | Indicating Instruments
Subject and UNIT: Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation
This type of instrument is principally used for the measurement of alternating currents and voltages, though it can also be used for d.c. measurements.
Construction, Working Principle, Torque Calculation, Advantages, Disadvantages, Applications | Indicating Instruments
Subject and UNIT: Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation
The basic principle of operation is that when a current carrying conductor is brought in a magnetic field (they should not be parallel to each other) a torque on the conductor is produced.
Types of Secondary Instruments, Types of Indicating Instruments
Subject and UNIT: Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation
Absolute instruments which give the value of the quantity to be measured in terms of the constants of the instrument and its deflection are called absolute instruments.
Subject and UNIT: Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation
An electrical instrument essentially consists of a movable element and a scale to indicate or register the electrical quantity being measured. The movable element is supported on jewelled
Types of Standards, Calibration, Types of Calibration
Subject and UNIT: Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation
A standard is a physical representation of a unit of measurement. The term 'standard' is applied to a piece of equipment having a known measure of physical quantity.
Subject and UNIT: Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation
The measurement system consists of several elements or blocks. It is possible to identify four types of element, although in a given system one type of element may be missing or may occur more than once.
Evolution, Types, Classification of Instruments
Subject and UNIT: Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation
Measurement involves the use of instruments as a physical means of determining quantities or variables. Because of modular nature of the elements within it, it is common to refer the measuring instrument as a Measurement System.
Subject and UNIT: Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation
Electrical energy is being used in the manufacture of many commodities. In order to ensure quality and efficiency, it is important that we should be able to measure accurately the electrical quantities involved.
AC Rotating Machines | Electrical and Instrumentation Engineering
Subject and UNIT: Electrical and Instrumentation Engineering: Unit III: AC Rotating Machines
Two Marks Question and Answers of AC Rotating Machines