This paper gives a detailed analysis of the principle of the phase lock circuit, one of the most important parts of the QF1052B Standard Signal Generator and provides some methods of checking it.

本文详细分析了QF1052B型标准信号发生器锁相环部分的基本组成及其工作原理，并提出了对此部分电路的检测方法。

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Due to need for the development of portable motor meter assembly checking box, a kind of frequency signal generator is designed, detailed design principle and idea are discussed.

针对“便携式汽车仪表总成校验箱”系统的开发需要，设计了一种用于汽车电子转速表、里程表校验的频率信号发生器，论述了电路的设计原理和设计思想。

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This article mainly introduces several kinds of common external signal interference in measuring and automatic control system, and the method on checking during installation and debugging.

本文主要介绍在检测、自动控制系统中常见的几类外部信号干扰及其在安装、调试过程中的排查方法。

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Every bus is now 3G integrated and it sends a signal straight away checking the card has enough funds on it.

BBC: The beginning of the end of cash and the paper ticket?

So, going forward, we need the power and voice of UGC news, as well as the curatorial tools and fact checking chops of working Journalists to help us filter signal from noise.

FORBES: Media. The Storm. And How Sandy Changes Reporting Forever.

Buoyed by their success, however, scientists on the mission are checking through the satellite's data to see if an infrasonic signal was also recorded when an asteroid entered the atmosphere over the Russian city of Chelyabinsk last month.

BBC: Japan quake 'heard at edge of space'