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An autotransformer is an electrical transformer with only one winding. The winding has at least three electrical connection points called taps. The voltage source is applied to two taps and the load is connected to two taps one of which is usually a common connection that is also connected to the source. Each tap corresponds to a different source or load voltage. In an autotransformer a portion of the same winding effectively acts as part of both the primary and secondary winding. The ratio of secondary to primary voltages is equal to the ratio of the number of turns of the winding they connect to. For example, connecting at the middle and bottom of the autotransformer will halve the voltage. Depending on the application, that portion of the winding used solely in the higher-voltage portion may be wound with wire of a smaller gauge, though the entire winding is directly connected.
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Auto Trim High Pressure Boilers are used in all auto trim shops. Steam boilers are built to the highest safety.
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Auto Water Vapor Permeability Tester are applicable in water vapour permeability test of barrier materials such as plastic film and laminated film. It control and adjust the technical index of packaging materials by testing the water vapour transmission rate. Test process is automatically controlled by single chip. It characteristics includes water method, computer controls, high in accuracy, test automatically, high resolution, dispense with manual intervention, test rapidly,high accurate temperature control, easy to realize the test condition, friendly human-equipment interaction, easy to operate, test data is displayed continuously, clear at a glance, sorted search function, function of storage, searching, print, plot, and communication. It is high in steady, easy to calibrate.
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