Alternating current: when the conductor moves to the left, the ammeter pointer deflects, indicating that current is generated in the circuit; When the wire moves to the right, the ammeter pointer deflects in the other direction, indicating that the current in the other direction is generated. If the wire moves back and forth, the ammeter pointer swings back and forth, and alternating current will be generated in the circuit.
Edit the physical properties of this paragraph.
The magnitude and direction change periodically at any time, and the current with an average value equal to zero in a period is called alternating current, which is expressly stipulated. Therefore: 1 Alternating current must have a constant period. 2. The current that changes direction and size is alternating current as long as it changes periodically and the average value in a period is equal to 0. 3. A current that changes its magnitude but does not change its direction must not be a device and method for measuring Hall effect with alternating current.
ApplicationNo./PatentNo.: 0 1 145435
The invention discloses a device and a method for measuring Hall effect related values such as mobility, carrier concentration, resistivity and the like in a semiconductor by using the Hall effect. Load the sample into an IC socket or similar calibrator, and fix the target inside a container of thermal insulation material capable of containing injected liquid nitrogen. The Hall effect correlation value is measured by using a moving element for moving a pair of permanent magnets to the outside of the thermal insulation container. The measuring equipment has simple structure and simple measuring operation. The level of the input voltage is measured according to the constant current supplied by the constant current supply unit included in the Hall voltage measuring unit. The measurement error detection unit detects and displays the measurement error of the sample by using the measurement level of the input voltage. Because the measurement error is detected before measuring the Hall effect, it can be eliminated.