Classification of electrician indicating instruments
Regarding the classification of electrician indicating instruments, indicating instruments can be divided into two categories: switch board type and portable according to their use methods, and can be divided into voltmeters, ammeters, power meters and power factor meters according to their measurement objects. In addition, there are DC meters, AC meter and AC and DC dual-purpose meter, etc.
1. Classification of electrician indicating instruments
There are many classification methods of electrician indicating instruments, which can be divided according to usage, measurement object, working current, usage conditions and working principle.
An electrician indicating instrument is an electric-mechanical conversion analog instrument that can convert the measured amount of electricity into the mechanical angular displacement of the instrument pointer.
This kind of instrument can directly obtain the measurement results according to the pointer's instructions, so it is also called a direct-reading instrument.
Indicating instruments can be divided into two categories: switch plate type and portable according to their use methods; according to their measurement objects, they can be divided into voltmeters, ammeters, power meters and power factor meters; according to their working current, they can be divided into DC meters, AC meters and AC and DC dual-purpose meters; according to their use conditions, they can be divided into five groups: A, A1, B, B1, and C; according to their ability to defend against external magnetic fields or external electric fields, they can be divided into four grades: I, II, III, and IV ; According to its working principle, it can be divided into magnetoelectric system, electromagnetic system, electric system, rectifier system, induction system, etc.
