02-03-2017, 11:19 AM
Comparators are classified into several types, such as electronic comparators, electrical, mechanical, optical, sigma, digital and pneumatic, these are used in various applications. Comparators play an essential role in the design of electrical and electronic projects. In electronic circuits, an op-amp is used with negative feedback and can also be used as a comparator. The comparator is primarily designed without feedback for the open loop configuration. These are widely used in A / D converters. When the i / p signal is sampled, then this signal is applied to multiple comparators to convert the digital form of analog. The comparators applications mainly involve BLDC operating motors, zero crossing detectors, switching power controllers and maximum detectors. This article gives a description of what a comparator and types of comparators are.
The Sigma Comparator
The figure shows the constructive details of Sigma Mechanical comparator. The vertical beam is mounted in flat steel Springs A connected to fixed elements, which in turn They are screwed to a back plate. The set provides a Movements without friction with a restriction of Springs The rod B at the base of the vertical beam is Ready to take a measuring contact, The range available. The stop C is provided to restrict movement to The lower end of the scale. Mounted on the fixed members, is the article Set D carrying the forked arms E. This assembly It incorporates a hardened fulcrum (provided with Means for adjusting the control of the trans- Moved) on the face of a jeweled insert In the flexible part of the set. The metal tape, attached to the forked arms, It passes around the G-axis that rotates it in Specially designed miniature ball bearings. Dipping The action to the movement is affected by a metal disc, Mounted on spindle, rotating in a magnetic field Between a permanent magnet and a steel plate. the Indicating the pointer H is secured to a protrusion on the disk .
The Sigma Comparator
The figure shows the constructive details of Sigma Mechanical comparator. The vertical beam is mounted in flat steel Springs A connected to fixed elements, which in turn They are screwed to a back plate. The set provides a Movements without friction with a restriction of Springs The rod B at the base of the vertical beam is Ready to take a measuring contact, The range available. The stop C is provided to restrict movement to The lower end of the scale. Mounted on the fixed members, is the article Set D carrying the forked arms E. This assembly It incorporates a hardened fulcrum (provided with Means for adjusting the control of the trans- Moved) on the face of a jeweled insert In the flexible part of the set. The metal tape, attached to the forked arms, It passes around the G-axis that rotates it in Specially designed miniature ball bearings. Dipping The action to the movement is affected by a metal disc, Mounted on spindle, rotating in a magnetic field Between a permanent magnet and a steel plate. the Indicating the pointer H is secured to a protrusion on the disk .