All analogue electrical indicating instruments need 3 essential devices these devices are briefly discussed below:
1- A deflecting or operating device.
A mechanical force is generated by the current or voltage which causes the pointer to have some deflecition from its 0 position.
2- A controlling device.
The controlling force works in opposition to the deflecting force & ensures that the deflection being shown on the meter is always the same for a given measured quantity. It also pr events the pointer always going to maximum level of deflection. There are 2 main types of controlling devices, which includes spring control & gravity control.
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1- A deflecting or operating device.
A mechanical force is generated by the current or voltage which causes the pointer to have some deflecition from its 0 position.
2- A controlling device.
The controlling force works in opposition to the deflecting force & ensures that the deflection being shown on the meter is always the same for a given measured quantity. It also pr events the pointer always going to maximum level of deflection. There are 2 main types of controlling devices, which includes spring control & gravity control.
