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Widely used in electronic equipment to adjust the size of in the circuit. In the measurement circuit of the comparison method, it can be used to directly read the attenuation value of the network under test. Improve impedance adaptation. If some circuits require relatively stable load impedance, a dimmer can be inserted between this circuit and the actual load impedance to dampen the impedance change. The carbon film has good consistency and consistency, stable strength and high reliability. Excellent electrical performance, minimal change due to temperature.