(b).
In order to ensure the proper operation of the indicating instruments , the following three torques … Fluid friction damping.
An indicating instrument essentially consists of a moving system pivoted in jewel bearings. We already know that an electrical indicating instrument will use a dial and pointer to display the magnitude.
In spring control method of indicating instruments consists of a control spring(made up of phosphor bronze),Balance weight,pivot and pointer. (a) and fig. The controlling torque is in opposite to the deflecting torque at a point where controlling torque and deflecting torque is equal the pointer stops and show the measured value of the reading. Types of Damping Torque.
We know deflecting torque, controlling torque and damping torque are present in measuring instruments.When a deflecting force is applied to the moving system, it deflects and it should come to rest at a position where the deflecting force is balanced by the controlling force. The damping torque in indicating instruments can be provided by: Air friction damping.
The spring is attached to the moving system of instrument .When pointer moves, the spring is twisted in the opposite direction. In the arrangement shown in fig (a), a light aluminum piston is attached to the spindle that carries the pointer and moves with a very little clearance in a … Air Friction Damping Arrangements of air friction damping are shown in fig. Eddy current damping. Due to this controlling torque in indicating instrument, the current produces deflection of the pointer proportional to its magnitude.The system producing a … A pointer is attached to the moving system which indicates the electrical quantity to be measured, on a graduated scale.
A hair spring usu ally of phosph or bronze is attached to the moving system of the instrument. With the movement of the pointer, the spring is twisted in opposite direction. The controlling torque is provided either by spring control or gravity control.
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