共查询到20条相似文献,搜索用时 149 毫秒
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《今日电子》2003,(10):49-49
美国福禄克公司最新推出三款产品,它们是FlukeC1600型硬携箱、系列附件套件和超值测试附件套件。FlukeC1600拥有足够深的内部空间并配有一个特定的隔层。在保证隔层空间足够大以容纳和保护设备的同时,它可容纳其他附件与必需品。相对于单独购买导线、钳表和测试夹等产品,购买套件一般来说将使顾客节约13%的成本。T5KIT套件包括超尖测试探头、两个鳄鱼夹和一个福禄克软包;TLK-220SureGrip工业测试线套件包含2条测试线、2个打开度鳄鱼夹、2个带压簧的鳄鱼夹和2条高强度测试线等8样工具及软包;TLK-225是SureGrip系列附件套件包括新式福… 相似文献
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随着汽车工业的发展,ECU的检测技术也在不断地进步和完善。该系统是基于WPF上位机界面的ECU自动测试系统,硬件部分是基于SCPI指令的安捷伦设备。测试的对象是汽车发送机的ECU。测试系统通过在WPF界面进行简单的操作,自动生成包含SCPI标准命令的测试命令,对整个测试系统的设备进行协调控制,实现按需配置的自动测试过程。由于WPF界面对SCPI命令的封装隐藏,使得用户不需要学习复杂的SCPI语法指令,只需要通过简单的鼠标选择就能实现对设备的控制操作,进而生成测试代码,从而实现ECU功能的自动测试,并将测试结果保存。 相似文献
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提出移相全桥DC/DC变换器闭环系统设计方案,基于PWM控制器件UCC3895设计一个双闭环控制系统,该系统采用电压外环和电流内环的控制方式,在电压环中引入双零点、双极点的PI补偿,电流环中引入斜坡补偿,结合实际应用对闭环系统进行实验测试,结果表明所设计的闭环系统动态响应快,稳定性好. 相似文献
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提出了一种系统实现协议健壮性测试的方法,该方法首先在分析BGP协议状态机的基础上,认为基本FSM对功能部分和健壮性处理部分未能严格区分。要提高FSM的健壮性,就需要通过增加状态、迁移和事件的基础上构造具有健壮性处理过程的RFSM(robustness finite state machines),把RFSM模型应用到BGP健壮性测试当中,文章详细构造了BGP冲击集合和RFSM,生成了反向测试集,并对测试特征序列和测试预言等问题进行了讨论。Cisco7200实际测试应用表明,用该方法生成的测试集与一致性测试集相比,其错误处理的覆盖率扩大了54%,检错能力提高了2.8倍。 相似文献
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Addabbo T. Alioto M. Fort A. Rocchi S. Vignoli V. 《IEEE transactions on circuits and systems. I, Regular papers》2006,53(2):326-337
In this paper, the guidelines to design a true random bit generator (TRBG) circuit with a predefined minimum entropy are discussed. The approach is proposed for a TRBG based on a one-dimensional piecewise-linear chaotic map; it does not require bit throughput reduction, and it is suitable for the development of integrated TRBG circuits. In particular, the proposed design strategy is based on a feedback control procedure that allows to dynamically change the system parameters for the correction of the circuit "nonidealities" (e.g., the circuit offsets). The correction algorithm does not require a direct measurement of the system "nonidealities" or of the effective value of the map parameters, but only a dynamic estimation of these quantities based on the observation of the TRBG output. The design approach is validated by a hardware prototype implemented on a field-programmable analog array. The results of the NIST FIPS 140-2 test suite, the DIEHARD test suite, and the Coron's Universal test, applied to the TRBG output sequences before and after a simple post processing without throughput reduction, are reported and discussed. 相似文献
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雷达接收机有大量的参数需要测量。传统的人工测试方法既费时又费力,而且测量的结果受人为因素的影响,已经不能满足实际测试的要求。而基于通用接口总线的雷达接收机自动测试系统是解决该问题的一条可行途径。文中介绍了该远程测试系统的硬件结构和软件设计。在软件设计上,本系统用Agilent IO Libraries Suite将VB程序转化为能够被程控仪器识别的标准命令,从而控制有通用接口总线接口的仪器;而仪器端则根据使用的命令树设计了一种基于二叉树的命令解析程序来解析控制端发送的命令。通过实际测试,该测试系统成功实现了计算机对通用接口总线设备的远程控制。 相似文献
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针对大规模软件系统状态迁移数量庞大,容易导致状态空间爆炸的问题,提出一种基于谓词抽象的测试用例约简生成方法,该方法依据给定的谓词集合对软件系统的状态空间进行等价类划分,通过状态集合之间的映射得到约简的抽象状态,并以抽象状态之间的迁移关系作为测试用例约简生成的基础。实验结果表明,该方法可以有效地对系统状态进行约简,并生成规模较小的测试用例集。 相似文献
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在软件可靠性测试中,随着测试输入数或操作数的增加,测试成本会大大增加。就此提出了一种针对软件可靠性测试的测试用例集精简算法,该算法先用正交试验设计法生成最初的测试用例集,然后用基于测试需求集的约简方法进行约简,生成最终的测试用例集,来进行软件可靠性测试。实例表明,该方法简化了测试用例集,从而大大降低软件可靠性测试代价。 相似文献
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Chang-Ming Liaw Wen-Chin Yu Thin-Huo Chen 《Industrial Electronics, IEEE Transactions on》2002,49(3):587-594
The random vibration control of an inverter-fed electrodynamic shaker is presented in this paper. First, the dynamic model of the shaker is found and a current-controlled pulsewidth modulation inverter is designed and implemented. The feedback controller is augmented with a command feedforward controller and a disturbance feedforward controller to let the armature exciting current have low harmonic content and possess excellent waveform tracking performance. Then, an acceleration controller and its random vibration command are arranged. In the proposed acceleration control scheme, a command feedforward controller and a robust disturbance feedforward controller are also employed to let the shaker have close random acceleration command waveform tracking control performance, and the performance be insensitive to the system parameter variations. It follows that the acceleration control with desired frequency response in a vibration test could be achieved through properly setting the command signal. The effectiveness of the proposed control scheme is verified by simulation and measured results 相似文献
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A supervisory (SV) signal transmission scheme for long haul optical amplifier systems is described. The scheme is based on subcarrier overmodulation of the line signal and features simple configuration; due to the use of EDFA gain modulation, no additive optical components are required in a submarine repeater to transmit a response signal. This paper discusses the subcarrier modulation index and frequency used for the SV signaling, the most significant design parameters. The dependence of the signal-to-noise ratio (SNR) on the modulation index in SV signal transmission is analyzed to clarify the modulation index value required for reliable SV signaling. In addition, the line signal impairment caused by subcarrier overmodulation is also analyzed to show the system's in-service feasibility. The subcarrier frequencies used for command and response signal transmission are discussed from the experimental results on the frequency response of an optical amplifier system and EDFA gain modulation efficiency 相似文献
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《Electromagnetic Compatibility, IEEE Transactions on》1965,7(3):249-262
The Project RELAY command system is described with emphasis given to the spacecraft equipment. Errors in the RELAY command system are discussed, and the probability of error in a single command word and the probability of a spurious command are given as a function of the signal-to-noise ratio (SNR) at the output of the command receiver in the satellite. The performance of the actual RELAY command system is discussed and shown to differ considerably from the performance predicted by theory. The results of an analysis of the orbiting command system are presented. The probable cause for the anomalous performance of the command system is shown to be Radio Frequency Interference from ground based transmitters. The techniques which are available to the system designer to avoid the problems experienced by the RELAY system are discussed in detail. 相似文献