所选信道上限，功率准确性，占用部分。
Upper threshold selected channel, power accuracy, segment occupancy.
数字加法器需要更多的电路、因而需要更大的功率才能工作，但它不需要这么高的准确性。
A digital adder needs more circuitry, and thus more power, to operate, but it does not require such high accuracy.
电力企业功率表与电流表指示不准，将严重影响计量的准确性。
The inaccurate indication of power meter and ampere meter will seriously influenced the metering accuracy of electric power enterprise.
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