According to application, instruments are classified as
According to application, instruments are classified as
1). Switch board
2). Portable
3). Both 1) and 2)
4). Moving coil
2 answers
According to the application, instruments are classified into types.
Switch board and Panel Instruments:
- Measuring instruments for switchboards have a square or a rectangular front
- The pointers and scales for these instruments should be so that the position of the pointer is conspicuous, the scale markings are legible and there is a contrast with the background
- Pointers are usually broad or carry broad targets as their ends
- Aluminium strip or tube is used for making pointers
- The scale is generally printed on the enamelled surface of a metal plate or on paper or cardboard pasted to a metal plate
- These types of instruments should be mounted in a vertical position
Portable Instruments:
- These usually have knife-edge pointer moving over scale marked with fine lines
- If the pointer and scale are in different planes, observational errors may result on account of parallax
- These parallax errors can be avoided by using knife-edge pointers and scales mounted in the same plane as a tip of the pointer
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