Frequency tracking circuit is one of the special circuits used in the ultrasonic generator.

频率跟踪电路是超声波发生器中的一种特殊电路。

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The controlling loop includes start-up circuit, frequency tracking circuit, driving signal circuit, and water lack protecting circuit.

控制回路由启动、频率跟踪、驱动信号、缺水保护电路组成。

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The former determines the frequency range which should be revised by the hot tracking circuit, while the later is the final frequency error of the local oscillator.

同时也提出了热跟踪后本振频率跟踪误差项。分析前者，可以决定热跟踪电路应予修正的频率范围，而后者则是跟踪本振最终的误差。

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The SEC has already proposed a number of changes designed to address their growing influence, including extra restrictions on broker-dealers that provide direct market access to high frequency traders, a trader tracking system for large traders, circuit breakers that would slow trading in individual stocks if they fall more than 10%, and new rules for off-exchange trading venues.

FORBES: SEC Wants Real Time Trading Data