Electrical Technology, Vol2: Machines and Measurements, 1/e

49

Meter Movement

OBJECTIVES

In this chapter you will learn about:

• The different types of torques in metre movements
• The associated scales in metre movements
• Moving-coil and moving-iron instruments
• The merits and demerits of the above instruments
• Polarized moving-iron instruments
• The construction and operation of dynamometer-type instruments
• Different types of induction-type instruments
• The details of construction and operation of hot-wire instruments
• The operating principles of thermocouple
• Utility of thermocouples as measuring instruments
• Galvanometers and their use as multi-type instruments
• Optical system associated with galvanometers
• The principle of electrostatic voltmeters
• The properties of electrostatic voltmeters
• Simple problems ...