d. Why is scale of Moving Iron instrument calibrated non- linearly?
Answers
Answer:
As the angular deflection of Moving Iron Instrument is proportional to square of operating current, therefore the instrument has basically square law response. Due to this square law response, the Moving Iron Instrument Scale is non-uniform.
Answer:
The RMS value of the voltage or current is used to express the needle deflection of a moving iron instrument. Because the angular deflection of a moving iron instrument is proportional to the square of the operating current, the instrument's response is essentially square law. The Moving Iron Instrument Scale's square law reaction causes it to not be uniform.
Explanation:
If there were no saturation, the change in inductance with the angle of deflection, dL/dΘ, would remain constant and the instrument would respond according to a pure square law. Moving iron instrument scales may simply be graded consistently for such a clean square response. However, the rate of change in inductance with an angular deflection in actual instruments, dL/dΘ, is not constant but rather depends on the angular location of the moving iron van. Because of the square law reaction, the moving iron instrument scale is deformed. This distortion in the moving iron instrument scale can be reduced by using an appropriate design, or by choosing the right dimensions, shapes, and locations for the iron van. As a result, it is conceivable to construct an instrument with a scale that is almost uniform throughout a significant portion of its length.
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