When calibrating an electronic gauge, adjustments are made when calibration factors are written into the memory of the meter. When calibrating this type of gauge, an electromagnet is used to adjust the strength of the permanent magnet mounted in the speedometer until the needle matches the input from the rotating cable. In a mechanical gauge, magnetic forces produce the torque that deflects the indicator needle.
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It is an especially vital process in the manufacture of speedometers because driver safety is reliant on an accurate readout. Speedometer Calibration Calibration is the process of determining the true value of spaces in any graduated instrument. Calibration must take into account several factors: Ratios of the gears in the drive cable The final drive ratio in the differential and the diameter of the tires. Calibration All speedometers must be calibrated to make sure the torque created by the magnetic field accurately reflects the speed of the car. It communicates this via electric or magnetic pulse signals, which are either translated into an electronic read-out or used to manipulate a traditional magnetic gauge assembly.
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In this type of gauge, a pulse generator (or tach generator) installed in the transmission measures the vehicle's speed. 2) Electronic Electronic speedometers are almost universally present in late-model cars. As the vehicle slows, the magnetic force on the aluminum ring lessens, and the spring pulls the speedometer's pointer back to zero. Attached to the aluminum ring is the pointer, which indicates the speed of the vehicle by marking the balance between these two forces. As the magnet rotates, it manipulates an aluminum ring, pulling it in the same direction as the revolving magnetic field the ring's movement, however, is counteracted by a spiral spring. This cable is directly attached to a permanent magnet in the speedometer assembly, which spins at a rate proportional to the speed of the vehicle. TWO TYPES: 1) Mechanical In a mechanical speedometer, a rotating cable is attached to a set of gears in the automobile's transmission. Описание для McAfee App Advisor (c google play)
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