Jon穿着他的电信制服走入场地安全办公室，然后说明他是由本地交换运营商(Local Exchange Carrier (lec))派来的，因为看来电路从电话公司形成了回路。
Jon walks into the campus security office in his Telco costume and explains that he has been called out by the Local Exchange Carrier (LEC) because a circuit appears to be looped from the Telco.
为了最大程度的安全，在被测电路加有电源时，请勿接触产品、测试电缆或其它任何仪器。
For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under test.
一个良好的安全实践是在测量之前假设所有位置电路上都存在危险电压。
A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring.
安全开关可以是一种电子开关，当汽车挂挡后，它断开控制电路。
The safety switch can be an electrical switch that opens the control circuit if the car is in gear.
发现直流电阻性本质安全电路在断开过程中低能电弧放电有三种情况。
It was found that there are three types of low-energy arc discharge during the breaking process of resistive intrinsically safe circuits.
安全、稳定的二分频电路设计。
逆变器主电路的可靠性是变频器等功率转化装置安全合理使用的保证。
The reliability in power circuit of inverter is assurance for VFD and other power transfer application.
沃尔沃加密锁相当于一个起动锁，因为起动钥匙通过安全加密的电信号和随机滚动码与发动机的起动电路进行通信。
The Volvo Immobiliser serves as a starter block since the starter key communicates with the engine′s starting circuit via security-coded electronic signals and random rolling codes.
使用测试设备测试电路的连续性，以确保系统的兼容性和安全性，随后进行安装，更换或维修。
Test continuity of circuits using test equipment to ensure compatibility and safety of system, following installation, replacement or repair.
内置的安全电路禁用电梯时，在充电的位置。
A built-in safety circuit disables the lift when it is in the charging position.
采用安全可靠的航天接头，充分保护电路的稳定性。整并的电路系统，不但安装简易而且维护方便。
Adopts safety and reliable spaceflight joint, sufficient protects the stability of the circuit. The whole circuit system, not only easy to install but also maintenance is convenient.
设计中将上述功能电路制成模块电路板，同时增加一应急电源和应急气道，大大提高车门的安全性与应急性。
In the design, the functional circuits are made into module circuit, and the emergency power and airway can also be increased to improve the safety and emergency of car greatly.
同时，他们测试电路，以确保兼容性和安全系统。
As well, they test circuits to ensure the compatibility and safety of systems.
电路部分使用了这种方法最初用于在加速度计，它部署在车辆的安全气囊在撞车时。
Circuitry parts made using this method were initially used in accelerometers, which deployed airbags in vehicles at the time of a crash.
推导出电感性本质安全电路低能电弧放电时间的计算公式。
Formulas of discharge time of low energy arc in the inductive intrinsically safe circuits are gained.
通过分析开关变换器的最危险故障状态，得出了判断其内部本质安全的等效电感电路。
The equivalent inductive circuit of switching converters for checking its inner-intrinsic safety is obtained by analyzing the most dangerous case in various operating mode.
防爆电路是石油、化工行业安全生产的重要保障。
Explosion-proof circuit is the important guarantee of safe production in petroleum and chemical industry.
设备运行的动态检测进一步完善了控制电路，保证设备能安全、可靠运行。
Dynamic testing of equipment has improved control circuit to guarantee safe and reliable operation.
本文介绍了数控设备中广泛使用的各种安全电路，并对其中几种的工作原理进行了重点分析。
The paper describes commonly used safety circuits in nc machines, and emphatically analyzes the working principles of some.
另外，最好要将安全电路与生产线安全电路联为一体，遇到紧急情况的时候就可以发挥作用了。
In addition, it is best to put the safety circuit and the production line safety circuit as a whole, in case of emergency can play a role.
轨道电路分路不良对运输生产构成巨大的安全隐患。
Defective shunting of track circuit constitutes a huge hidden trouble to the transportation production.
整体电路符合故障-安全特性的要求。
Integral circuit accords with the demands of fail-safety specific property.
根据此方法定期检测轨道电路的主要参数，在误差允许范围之内判断轨道电路的安全性具有很强的实际意义。
Testing the main parameters of track circuit at interval by this method and estimating the safety of track circuit when error is permitted have strong practical meaning.
在从事电路系统之前，熟练的电气工要学习电学、电磁学和安全用电守则。
Skilled electricians learn the theory of electricity, magnetism, and electrical safety before they begin working with electrical systems.
故在电路中起着自动调节、安全保护、转换电路等作用。
So it should play a role in automatic adjustment, safety protection, conversion circuit.
文章提出了本质安全电路的分析与评价原则，并结合一个简单的电路讨论了这种分析与评价的方法。
This article gives a basic analysis and assessment principles of intrinsic safety circuit, meanwhile a simple example is gave to discuss this method briefly.
本文对移频自动闭塞发送设备信息源电路的频率安全性及稳定性进行了分析，并总结出最佳设计方案。
The article analyses the frequency security & stability of signal generator circuit of dispatching equipment of automatic block with frequency shift, and an optimum design scheme is concluded.
由爆胎模拟实验得到了爆胎信号特征，由此提出了由爆胎特征提取电路、安全电路、逻辑判断电路、点火电路组成的控制器设计原理及压电供能的设计方法；
With a simulation experiment, the signal of tire burst is gained from the piezoelectric sensor. Then design a feature extraction circuit unit, also with the safety circuit.
对本质安全电感电路，最小建电弧电压能反映电路的建弧特性，电流变化率能反映电路的电感特性。
For an inductive intrinsically safe circuit, minimum arcing voltage shows the arcing characteristics and current reducing rate shows the inductive characteristics.
为确保机车安全可靠地运行，提出了加装故障励磁电路的建议。
The proposal for installing failure excitation circuit is given to guarantee safe operation.
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