Technical Information
Ripple Factor
The coil operating current should be pure direct current for optimum operation. Rectified alternating current may be used but the operating characteristics, primarily pickup and dropout voltages, may be altered due to the ripple factor of the rectified current. A capacitor may be used to reduce the ripple factor to below 5% by applying the following formula:
To calculate the ripple factor
To calculate the ripple factor
Ripple factor (%) = E max. - E min.
E mean
X 100%  E min. = min. value of pulsating component
E max. = max. value of pulsating component
E mean = average value DC component
Full wave rectified current may be used but a slight decrease of attractive force may result accompanied by a change in vibration and shock resistance.
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