Admin Table of Contents
What is the importance of deflecting torque in analog instruments?
The torque needed to move the pointer over a calibrated scale is known as deflecting torque and it can overcome the inertia of the moving system, controlling torque and damping torque. The deflecting torque in the analog measurement device is proportional to the current through the coil.
What is deflecting force?
DEFLECTING FORCE The deflecting force is the force required for moving the pointer from rest on the calibrated scale. The current ( or voltage ) under measurement is utilized to produce the deflecting force.
What is the function of deflecting torque?
Deflecting Torque in Indicating Measuring Instruments: The deflecting torque or operating force is required for moving the pointer from its zero position. The system producing the deflecting force is called “Deflecting system or Moving System”.
What is the function of controlling torque?
Controlling torque increases with the deflection of the moving system so that the final position of the pointer on the scale will be according to the magnitude of an electrical quantity (i.e. current or voltage or power) to be measured.
What are the functions of deflecting controlling and damping torques?
Damping force or Damping Torque: This force is necessary to bring the pointer to rest in its final deflected position quickly. Without such damping, the combination of deflecting torque and controlling torque makes the pointer to oscillate about its final deflected position for some time.
What is galvanometer function?
galvanometer, instrument for measuring a small electrical current or a function of the current by deflection of a moving coil. The deflection is a mechanical rotation derived from forces resulting from the current.
What is the direction of deflection?
A positive charge, top, moving perpendicularly through a magnetic field is deflected. The right-hand rule, bottom, predicts the direction in which the positive charge will be deflected. A similar left-hand rule predicts the deflection of negative charges.
How does air friction damping work?
Air friction ‘or’ pneumatic damping: In this system, a light aluminum piston is attached to the spindle of the instrument and is arranged to move in a fixed air chamber closed at one end. The compression and suction action of the piston on the air in the chamber damp the possible oscillations of the moving system.
What is a deflecting torque?
The deflecting torque is produced by the electromagnetic action of the current in the coil and the magnetic field. When the torques are balanced, the moving coil will stop, and its angular deflection represents the amount of electrical current to be measured against a fixed reference, called a scale.
What is deflecting and controlling torque?
In this method, a small weight is attached to the moving system, which provides necessary controlling torque. However, under the action of deflecting torque, the pointer moves from zero position and control weight moves in opposite direction.