Beat Frequency Oscillator | Working & Limitations

Beat Frequency Oscillator is a type of oscillator used to obtain variable frequency output in the audio frequency range. The basic working of this type of oscillator is as follows. Working Principle Figure 1 shows a block diagram of beat frequency oscillator (BFO). It uses two Radio frequency (RF) oscillators. One is fixed frequency oscillator … Read moreBeat Frequency Oscillator | Working & Limitations

Cathode-ray Oscilloscope (CRO) | Questions & Answers

Q. What is Cathode-ray Oscilloscope (CRO)? Answer. A Cathode-ray Oscilloscope (CRO) is an electronic device with a Cathode ray tube (CRT) as its main component and other associated circuits consisting of a power supply unit, a saw-tooth wave generator, horizontal and vertical amplifiers. Q. How is CRO superior to ordinary measuring instruments? Answer. CRO is an electronic device that … Read moreCathode-ray Oscilloscope (CRO) | Questions & Answers

Q-meter | Questions & Answers

Q. What is Q-meter? Answer. The Q-meter is an instrument designed for measurement of Q-factor of a coil as well as for the measurement of electrical properties of coils and capacitors. Q. On what principle does a Q-meter operate? Answer. The Q-meter operates on the principle of series resonance i.e., under a resonant condition of an ac series circuit … Read moreQ-meter | Questions & Answers

Blondel’s theorem | Power in Poly-Phase System

Statement Blondel’s theorem states that if a network is supplied through P conductors, the total power is measured by adding the readings of P wattmeters so arranged that a current element of a wattmeter is in each line and the corresponding voltage element is connected between that line and a common point. Note: If the … Read moreBlondel’s theorem | Power in Poly-Phase System

Wheatstone Bridge | Working Principle & Applications

A Wheatstone bridge is used for the accurate measurement of resistance. The Wheatstone bridge works on the principle of null deflection, i.e. the ratio of their resistances are equal, and no current flows through the galvanometer. The general arrangement of Wheatstone bridge circuit is shown in the fig. 1. It is a four arms bridge circuit … Read moreWheatstone Bridge | Working Principle & Applications

Difference Between Current & Potential Transformer

The differences between Current Transformer (CT) and Potential Transformer (PT) are given below: S.No. Current Transformer (CT) Potential Transformer (PT) 1. It is connected in series with the power circuit. It is connected in parallel with the power circuit. 2. Its secondary is connected to an Ammeter. Its secondary is connected to a Voltmeter. 3. Its secondary … Read moreDifference Between Current & Potential Transformer

Measurement of Medium Resistance

Resistance is classified into three categories as low, medium and high resistance. Medium Resistance ranges from 1Ω to 0.1 MΩ. The different methods used for the measurement of Medium resistance are as follows: Ammeter Voltmeter method Substitution Method Wheatstone Bridge Method Ohmmeter Method Substitution Method In this section, we will learn about Measurement of Medium Resistance by Substitution Method. … Read moreMeasurement of Medium Resistance

Measurement of Low, Medium & High Resistance

Resistance is classified into three categories for the sake of Measurement. Different categories of Resistance are measured by the different techniques. They are classified as Low Resistance: Resistance having value 1Ω or below are kept under this category. Medium Resistance: This category includes Resistance from 1Ω to 0.1 MΩ. High Resistance: Resistance of the order of … Read moreMeasurement of Low, Medium & High Resistance

Permanent Magnet Moving Coil or PMMC Instruments

PMMC stands for Permanent Magnet Moving Coil. PMMC Instruments are the most accurate type for the measurement of DC current or voltage. Construction of PMMC Instruments Permanent Magnet Moving Coil or PMMC Instruments consists of following components: Moving Coil Magnet System Control Spring Damping Pointer and Scale 1. Moving Coil The moving coil made up … Read morePermanent Magnet Moving Coil or PMMC Instruments

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