Control springs in analog measuring instruments typically provide a restoring torque, ensuring the pointer returns to zero when the input signal is removed and resisting the deflecting torque to allow for a steady reading.
However, certain types of Power Factor Meters, particularly those based on digital technology or specific electrodynamic designs, do not require physical control springs. In these instruments, the restoring force or indication mechanism is often managed by electronic circuits or derived from the magnetic field interactions themselves, making dedicated springs unnecessary for operation.
Therefore, the number of control springs provided in such Power Factor Meters is zero.
The spindle of the moving system in a PMMC instrument is supported at both ends with the help of-
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