Advantages of Gravity Control | disadvantages of Gravity Control
This page covers advantages and disadvantages of Gravity Control. It mentions Gravity Control advantages or benefits and Gravity Control disadvantages or drawbacks.
What is Gravity Control?
• In this method, a small adjustable weight (W) is attached to the spindle.
• The controlling torque can be varied by changing the position of the weight on the arm.
• In zero position of the pointer, the control weight hangs vertically downwards and hence it does not provide torque.
• Under deflecting torque, the pointer moves from zero position and control weight moves in opposite direction.
• Due to gravity the control weight would try to come to its original position and would produce a torque.
• The controlling torque as produced opposes the deflecting torque.
• The pointer comes to rest at a position where two torques are equal and opposite.
Benefits or advantages of Gravity Control
Following are the benefits or advantages of Gravity Control:
➨It is very cheap.
➨Method is very simple.
➨It is unaffected by change of temperature.
➨Controlling torque can be easily varied.
➨It is not subjected to fatigue or distortion with time.
Drawbacks or disadvantages of Gravity Control
Following are the drawbacks or disadvantages of Gravity Control:
➨Instrument has to be kept in vertical position only.
➨The scale of the instrument is not uniform.
➨The weight of the moving system is high.
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