The Meter at Work |
Contents
GENERAL CONSIDERATIONS1 Purpose of | 3 |
MOVINGIRON METERS8 Oersteds Discovery9 | 9 |
MOVINGCOIL METERS 24 Early Experiments | 25 |
Common terms and phrases
a-c circuits accuracy amount ampere APPLICATIONS OF METERS arrangement attracted basic becomes calibration carrying cause chapter CHARACTERISTICS OF METERS charges circuit component condition conductor connected consequently current flow current meter cycles d-c meters damping deflection depends developed device direction discussed dynamometer effect electrical electrostatic employed equal example exists fact frequency full-scale deflection greater heat higher illustration important increase indication inductance instrument iron limit lines of force load magnetic field magnetic lines means measurement ment meter coil milliampere movable movement moving moving-coil meter moving-iron multipliers ohms operation passed percent permanent magnetic pivot plate plunger pointer points pole position possible potential PRACTICAL APPLICATIONS quantities range reading rectifier resistance resistor result scale sensitivity shown in Fig shunt side spring thermocouple tion transformer turning type of meter usually utility vane voltage drop voltmeter volts wattmeter zero