The working principle of the current meter

1. The working principle of the current meter: The stream meter is made of the magnetic field with the magnetic field with the power field in the magnetic field. When the current is too long, the current is cut through the spring and the shaft through the magnetic field and the current. Therefore, the effect of the magnetic field force will cause the coil to be deflected, and the rotation and pointer deflection will be driven. Because the size of the magnetic field force increases with the current, the deflection of the pointer can be observed to observe the size of the current. This is called a magnetic electric current meter.

2. The use rules of the current meter:

① The current meter should be connected in the circuit (otherwise short circuit.);

② Do not exceed the range of the current meter (you can use the method of trial touch to see if it exceeds the range.);

③ Absolutely not allowed to connect the current meter to the dual pole of the power supply without using an electrical appliance (the internal resistance of the current meter is very small, which is equivalent to a wire. Current meter, power supply, wire.)..

④. See the position of the table needle stop (must be observed from the front) 5. The voltage table: a. The concept of the voltage table: the voltage table is a instrument that measures the voltage. There is a permanent magnet, connecting a coil composed of a wire between the two wiring columns of the current meter, the coil is placed in the magnetic field of the permanent magnet, and connected to the pointer of the table through the transmission device. The voltage gauge is a considerable resistor, and ideal is ideal.

1. Working principle of voltage gauge: The voltage meter is assembled by a current meter. The internal resistance of the current meter is very small. Then connect a large resistor to directly and receive two points that need to be used. Knowing that the current displayed by the current meter is proportional to the external voltage, so you can measure the use of the voltage C. The voltage meter can be used: the voltage table can directly measure the power supply voltage. What time is it:

(1) When the voltage measurement is measured, the voltage meter must be connected in parallel to both ends of the measured circuit;

(2) Select the range correctly, and the measured voltage should not exceed the range of the voltage meter. Paid in the circuit during use; if connected in series, the power supply is measured. However, the above -mentioned components are the most basic components of the power distribution box. In the actual production process, it will also add other components according to the different uses of the power distribution box and the requirements for the use of the power distribution box. For example: AC contactor, intermediate relay, time relay, button, signal indicator, KNX smart switch module (with capacity load) and background monitoring system, smart fire evacuation and background monitoring system, electrical fire/leakage monitoring detector And background monitoring system, EPS power battery, etc.

The installation of the power distribution box requires the production of non -flammable materials for the application of the power distribution box; the production place and office with a small dangerous danger can be installed in the open power distribution board; Forging, thermal treatment, boiler room, woodworking room and other places, closed -type cabinets should be installed; in dangerous operating places with conductive dust or produce flammable and explosive gas, a closed or explosion -proof electrical facility must be installed; the power distribution box must be installed. Each electrical component, instrument, switch, and lines should be arranged neatly, the installation is firm, and the operation is convenient; the bottom surface of the board (box) installed on the ground should be 5 ~ 10 mm higher than the ground; ～ 1.2m rangeless obstacles; reliable protection line connection; no naked electrical body is exposed outside the box; electrical components on the outer surface or power distribution board must be installed, and there must be reliable screen protection.