The basic working principle of the electric indicator is to convert the measured electric quantity or non-electric quantity into the deflection angular displacement of the movable part of the indicator. The measured can not be directly added to the measuring mechanism, and it is generally necessary to convert the measured into a transition quantity that can be measured by the measuring mechanism. This part which is converted into transition quantity by measurement is called measuring circuit.
The mechanism that converts the transition quantity into deflection angle according to a certain relationship is called measuring mechanism. The measuring mechanism consists of a movable part and a fixed part, which is the core of the instrument. Electric indicating instrument is generally composed of measuring circuit and measuring mechanism.
The main function of the measuring mechanism is to generate the rotating torque that deflects the indicator of the instrument, as well as the reaction torque and damping torque that make the indicator keep balance and stability quickly.
When the measuring circuit converts the measured electric quantity or non-electric quantity into the electric quantity that can be directly measured by the measuring mechanism, the movable part of the measuring mechanism deflects under the action of the deflection torque. At the same time, the reaction moment generated by the part of the measuring mechanism that generates the reaction moment also acts on the movable part. When the rotational moment is equal to the reaction moment, the movable part stops.
Because the movable part has inertia, it can't stop quickly when it reaches equilibrium, but swings back and forth near the equilibrium position. The damping torque generated by the damping device in the measuring mechanism makes the pointer quickly stop at the equilibrium position and point out the measured size, which is the basic working principle of the electrician indicating instrument.
When artificial poles are erected, there should be a special person to direct them. Check whether the tools are firm and reliable before poling (e.g. the fork wood is free of scars, the chain is suitable, and the sliding rope, horizontal rope and steel rope are free of scars).
The ground anchor drill should be firm and reliable, and the rope should be applied evenly in all directions. When operating, cooperate with each other, obey the command and balance the strength; No one is allowed to stand under the mechanical upright post and jib, and all live lines above (within the rotating radius of jib) must be cut off.