A timer is a device that measures time using a specific principle. Timers can be used to help you solve these problems. The operation interface is simple and easy to use, and provides basic timing control functions, including: start timing, stop timing, continue timing, easy operation interface, reset to zero, and adjust timing.
The types of modern timers include electromagnetic dot timers, electric spark timers, stick timers, parking timers, reaction timers, zoom-in timers, and windows timers. Electromagnetic dot timers and electric spark dot timers are the most common.
The electromagnetic dot timer is a timing device using AC power. Its working voltage is 4-6V and the frequency of the power source is 50Hz. It ticks every 0.02s. Working principle: When the coil of the electromagnetic dot timer is energized, the coil generates a magnetic field. The vibrating plate in the coil is magnetized. The vibrating plate moves up or down under the action of the permanent magnet magnetic field. Since the direction of the alternating current changes every cycle Twice, the magnetic pole of the vibrating piece must be changed, and the direction of the force of the permanent magnet on it must be changed. Doing so, so do it once in a cycle of alternating current, that is, the time interval between every two points is equal to the cycle of alternating current.
EDM timer is a timing device that uses a spark discharge to make small holes in the paper tape to show dots. It uses 220V AC voltage. When the frequency is 50Hz, it hits a point every 0.02s. When the EDM timer works , The resistance to guide movement is relatively small, the test error is smaller than the electromagnetic dot timer. Working principle: EDM timer is a timing device that uses spark discharge to make toner dots on the paper tape to show dots. Connect the 220V power supply to the EDM timer and press the pulse output switch to time The pulse current from the generator is connected to the discharge needle of the positive electrode and the toner paper tray to the shaft of the paper tray connected to the negative electrode, and a spark discharge is generated, so a series of dots are marked on the paper tape, and the discharge is performed once in each cycle of alternating current. The time interval between the dots of the EDM timer is equal to the period of the alternating current.
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