1. *This instrument demonstrates the relationship between the direction of the ampere force and the magnitude of the current, as well as the current strength, the length of the energized wire, and the intensity of the magnetic induction lines.* 2. *The wire frame (conductor) is deflected under the action of the ampere force in a uniform magnetic field, while also being influenced by the horizontal component of its own gravity. When the two forces achieve equilibrium, the plane of the wire frame tilts at a certain angle and remains stationary (the greater the angle, the larger the ampere force exerted). The deflection angle is magnified and displayed on the dial by the pointer.* 3. *Before use, the pointer should be adjusted to align with the zero mark.* 4. *During operation, ensure that the three contact points of the wire frame maintain good contact with the terminal clips of the clamp. If , the contact points can be polished with fine sandpaper.*