| 摘要 |
An apparatus for measuring an impedance produces an alternating current from digital codes representative of a sine wave, and converts an ac voltage due to an alternating current flowing into an object to a digital signal; a multiplier successively multiplies the binary values of the digital signal by the binary values of the digital codes representing the sine wave and a cosine wave, an accumulator successively adds the products, and a microcomputer calculates the impedance of the object on the basis of the sums of products, thereby improving the accuracy of the calculating result.
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