NULL METHOD OF MEASUREMENT
A null method of measurement is a simple, accurate and widely used method which depends on an instrument reading being adjusted to read zero current only. The method assumes:
(i) If there is any deflection at all, then some current is flowing;
(ii) If there is no deflection, then no current flows (i.e. a null condition).
Hence it is unnecessary for a meter sensing current flow to be calibrated when used in this way. A sensitive milli-ammeter or micro-ammeter with center zero position setting is called a galvanometer. Examples where the method is used are in the Wheatstone bridge, in the DC potentiometer and with AC bridges.
Related Topic – click here
- What Is A Diode? Working Principle & Types | Different Types Of Resistors
- What Is Synchronous Speed? | Types & Advantages Of DC Motors
- Working Principle Of Linear Variable Differential Transformer | Construction & Piezoelectric Transducers
- Three-Phase Induction Motor | 3-Phase Induction Motor Principle
- Introduction To Electrical Transformer | Definition, Construction & Parts Of A Transformer | Types Of Transformers
- DC Generator | Principle Of Operation, Construction, Types Of Generators & Application
- What Is DC Motor? | Principle Of DC Motor & Types Of DC Motors
- Diode-Circuits |Diode Convention, Transformer Rectifier & Objective Questions With Answer
