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用VB实现基于VISA标准的功率放大器自动测试系统 总被引:1,自引:0,他引:1
通过一个应用于功率放大器测量的完整实例,介绍在Visual Basic编程环境中调用VISA(虚拟仪器软件构架)库实现对带有GPIB(通用接口总线)接口的智能仪器进行程序自动控制,构建一个实用的自动测试系统。首先分析测试系统的原理,接着从硬件设计、软件设计两个方面详细阐述系统的设计方案,最后给出具体的实现方法,并展示运行效果。 相似文献
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本文基于LabVIEW开发了示波器TDS3032B的GPIB、LAN、RS232三种接口的通信程序,该计算机程序均实现了快速采集示波器的时间分辨信号,并能对该信号进行实时处理和保存工作。该开发的示波器的三种接口通信程序均实现了计算机自动化采集与控制,程序经过少量修改即可用于基于示波器的科研实验和工程项目的自动测试系统中。 相似文献
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王海勇 《化工自动化及仪表》2014,(10):1177-1180
针对某测量系统直流变换器的性能参数要求,研究并设计相应的测试设备。介绍了手动和自动两种方法测试8台单机共56路信号的具体实现方案,给出了自动测试时数据的采集与处理算法。 相似文献
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虚拟仪器技术是在当今计算机技术和检测仪器技术的基础上发展而来的,虚拟仪器技术作为当今自动测试校准装置的一项核心技术,可以使自动测试校准装置完成现场校准大型自动测试系统,从而使测量、测试达到较高的自动化。 相似文献
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简要介绍了P2成型机各部份的性能及特点、电控系统的组成以及InteIbus-s总线的结构特点。针对InteIbus-s总线上出现的故障进行分析、排查及PLC程序改进。 相似文献
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设计了一种基于虚拟仪器技术的静态磁特性自动测试仅,解决了软磁、硬磁材料静态磁特性的自动测试问题.实际测试结果表明:该仪器具有良好的测试性能,对实际应用中磁性材料静态磁性能的快速测试和优选具有实用价值. 相似文献
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Dinesh Singh J. K. Gehlawat Musti S. Rao 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1990,47(2):127-136
Oslefins and diolefins are important intermediates in the petrochemical industry and the future promises a further substantial increase in demand. While several catalysts have been formulated in the past for the abstraction of hydrogen from butenes and propylene, these catalysts are inefficient in the abstraction of first hydrogen from butane. Bismuth molybdates (β and γ-phases) containing iron oxide and supported on alumina are used as catalysts in the present investigation on the oxidative dehydrogenation of n-butane. Effects of catalyst content, temperature and oxygen: n-butane ratio on conversion and selectivity to butadiene and (C4H8 + C4H6) are studied in the following ranges of experimental conditions: β-bismuth molybdate/100 mol support I(K), 3–9; γ-bismuth molybdate/100 mol support I(K), 5-20; temperature, 400–500°C; O2: butane ratio, 0.6:1.7. 相似文献
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考登钢作为一种高耐候结构钢,广泛应用于各个领域。在火力发电方面,考登钢主要应用在工作环境比较恶劣的烟气加热器和空气预热器中。考登钢表面涂搪的目的就是进一步提高其耐腐蚀性能,延长使用寿命。为了提高考登钢元件的使用寿命,对考登钢表面涂搪瓷的可行性、密着性能、瓷釉、工艺控制、质量保证等方面进行了研究。 相似文献
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A viscometer used to measure the viscosity of 10 μl of a liquid, must be miniaturized down, and the liquid velocity gradient in the channel used to determine the viscosity coefficient. Two major factors that affect the liquid velocity are the mechanical forces exerted by the mechanical motors and electromagnetic forces. In this study, electrowetting on dielectric (EWOD) is adopted to drive liquids. Variously sized electrodes on a chip, and two shapes of channel are employed to measure the velocity gradient to determine the viscosity coefficient. The device is fabricated by microelectromechanical system (MEMS) technology. The dielectric layer used in EWOD has a high dielectric constant, BST (Ba0.7Sr0.3TiO3), to reduce the required applied voltage; its surface is coated with hydrophobic polymer, polytetrafluoro-ethylene (PTFE, Teflon® AF DuPont). Experimental results demonstrate that liquids can be pulled at 660 μm/s in linear channels by applying a voltage of 15 V. 相似文献
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研究了温度和pH值对漆酶酶活以及漆酶处理纤维压制纤维板性能的影响。结果表明,pH较低、温度较高时漆酶酶活较高,压制的纤维板强度性能较好。但温度太高(60~80℃),延长加热时间,漆酶稳定性变差,酶活明显降低,压制纤维板的强度下降。 相似文献
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In reexamining medium effects on photochemical reactions, we have emphasized those on unequilibrated excited species such as the Franck-Condon species. Despite recent advances in femtochemistry, such a discussion in molecular photochemistry is uncommon, and the problem remains challenging on account of the extremely short-lived excited species. However, in such cases, a small perturbation resulting from, for example, weak guest-host interactions could turn into a determining factor in dictating the course of a photochemical channel of deactivation. Examples of medium-directed diabatic processes have been examined with this idea in mind. A modified view on rhodopsin photoisomerization is presented along with the consideration that confinement does not necessarily lead to inhibition of reactions of the trapped substrate. 相似文献
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采用实验方法考察工艺参数对沉降斑的影响。基于一个带凸台的平板模具,采用L27(313)正交矩阵进行实验,研究了几何尺寸、熔体温度、注射时间、保压压力及保压时间对厚度突变处沉降斑形成的影响,同时还考虑了熔体温度和注射时间以及保压压力和注射时间之间的交互作用影响;通过性噪比分析和F检验优化成型工艺条件并对工艺参数的影响进行显著性分析。结果表明,对于厚度突变的平板制品,厚度突变的程度对其沉降斑形成的影响最大,其次为熔体温度,保压压力,保压时间等;采取减小厚度变化,降低熔体温度或增加保压压力和保压时间等措施,可以减小厚度突变处沉降斑,从而减少其对外观质量的影响;因素之间的交互作用对制品沉降斑的形成有一定的影响,熔体温度B和注射时间C之间的交互作用影响较为明显,而保压压力D和注射时间C之间的交互作用对该质量指标的影响最小,可以并入误差。 相似文献