A device that compares the unknown length with the standard. Such measurement is known as comparison measurement and the instrument, which provides such a comparison, is known as Comparator.
Comparators are generally used for linear measurements. And it gives only dimensional differences in relation to a basic dimension of the object.
Various comparators currently available basically differ in their methods of amplifying and recording the variations measured.
In comparison measurement, it is dependent on the least count of the standard and the means for comparing. A comparator should have a high degree of accuracy and precision.
A comparator can be it mechanical, Pneumatic, or electrical, by the means of amplification of signals, a linearity of the scale within the measuring range should be assured.
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Types of Comparators
Comparators can be Mechanical or Electrical by the mean used for comparison.
With respect to the principle used for amplifying and recording measurements, comparators can be following types
1. Plunger dial gauge
2. Vernier Height gauge
3. Electronic Height Gauge
4. Slip gauge
5. Projection comparators and multi-check comparators
The dial indicator or the dial gauge is one of the simplest and the most widely used Mechanical comparator.
Electronic gauges are more accurate and reliable than mechanical, which has made them the preferred choice in many applications.
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