用PC直接获取数字示波器波形和联机波形参数测量

数字存储示波器,顾名思义除了能实现一般的显示波形功能之外,更重要的是能将屏幕上显示的波形保存下来,以便作再次观察和其它用途,这是数字存储示波器和普通示波器的根本区别。据了解,一般的数字存储示波器用户,都会使用它进行测量和观察波形,对如何存储波形的方法并没有去研究或不太了解。本文提供了利用电脑与安捷伦数字存储示波器实现联机,并利用电脑直接将示波器的波形存储下来,和对存储下来的波形进行参数测量分析等方法,对数字存储示波器用户有一定的参考价值。     

High-frequency periodic time-domain waveform measurement system

A system is presented for the accurate measurement of high-frequency periodic time-domain voltage and current waveforms of a nonlinear microwave device. The measurements are performed in the time domain using a high-speed sampling oscilloscope. The results are Fourier-transformed into the frequency domain for error correction and then back into the time domain. An error-correction algorithm is presented that makes it possible to obtain accurate waveforms in spite of nonideal system components. Practical difficulties in measurement-system characterization are also discussed. An accurate circuit model for the measurement fixture is developed and its element values are determined. Measurement results are given showing the waveforms in a microwave transistor operated in the nonlinear region. The errors caused by signal processing are discussed     

基于等效和实时采样的数字示波器设计

基于数字示波器的基本原理,以单片机和FPGA组成的最小系统为控制核心,实现了普通示波器对被测信号的采样、存储与回放,并且增加了等效采样和采样保持功能,极大地提高了系统的测量范围.该系统具有实时采样和等效采样两种方式,以不大于1 Ms/s的A/D转换实现200 MS/s的等效采样率对输入1 Hz～10 MHz,Vp-P为2 mV～8 V的信号进行采样处理,并能进行单次触发,自动和存储,榆出波形.     

基于等效和实时采样的数字示波器设计

基于数字示波器的基本原理,以单片机和FPGA组成的最小系统为控制核心,实现了普通示波器对被测信号的采样、存储与回放,并且增加了等效采样和采样保持功能,极大地提高了系统的测量范围。该系统具有实时采样和等效采样两种方式,以不大于1Ms／s的A／D转换实现200MS／s的等效采样率对输入1Hz-10MHz,yp-p为2mV-8V的信号进行采样处理,并能进行单次触发,自动和存储／输出波形。     

新一代示波器实现数据高速采集和更高安全性

横河电机日前推出模拟带宽1．5GHz，实时采样频率10GSps的新一代数字示波器DL9000系列，可满足手机、液晶电视、数字家电、汽车电子等众多领域的研发和测试需要。DL9000 SigalXplorer是横河数字示波器的第10代产品，与以前版本的产品相比，它具有更高的波形采集和分析速度、更强的历史内存功能、更高的安全性、更直观的显示效果，以及更小的尺寸等特点。     

Calibration and error analysis of a picosecond pulse waveform measurement system at NBS

The primary system used at NBS, Boulder, CO, to measure fast (picosecond-nanosecond range), repetitive, electrical pulse parameters consists essentially of a wide-band (dc-18 GHz) sampling oscilloscope interfaced to a minicomputer. This paper describes the major calibration and analysis techniques used to reduce the effects of errors inherent in this system, both deterministic and random in nature.     

实时测温系统中采样精度的提高措施

在介绍一种利用InGaAs/I半导体激光器并采用钽酸锂热释电探测器实时测量比辐射率及温度的系统的基础上,着重讨论了从光、电干扰及其抑制这两方面所采取的提高其采样精度的措施：一是在抑制光干扰的基础上选择合适的采样时机并优选采样结果;另一是在抑制电干扰的基础上选择合适的采样周期并进行信号平均。给出了系统的采样硫程图,进行了一些必要的分析和讨论。     

20 GHz on-chip measurement of ESD waveform for system level analysis

Reliability of embedded electronic products is a challenging issue regarding ElectroStatic Discharge (ESD) events into real live applications. This is strongly related to the increased number of embedded systems and to technologies shrinking that result in less robust chips. To ensure the safety of electronic systems, the ESD events have to be taken into account at first design phase. But equipment manufacturers are facing the dilemma that no information is provided by the semiconductor manufacturers. At the same time Integrated Circuit (IC) designers have to take into account the final application environment to build the ESD protection strategy. Depending on the external components (external means around the chip) the on-chip current path could change. Understanding how the system environment impacts the current path within the chip is needed. This paper deals with on-chip oscilloscope developed for in-situ measurement of real ESD event in 65 nm CMOS technology. The measurement bandwidth of the embedded sampler is 100 GHz, and 20 GHz for the probes. Thanks to this technique, impact of the system on the current path of the on-chip ESD strategy will be observed. Some measurement results during an ESD stress on an I/O structure will be presented and analyzed showing that PCB trace and package induce the creation of new current paths.     

波形抽样法测相的算法方案设计

由于高速模数转换器的出现,使得波形抽样法测量相位差成为可能。这种测相技术与传统的测相技术相比最大的优势是对输入信号的频率范围无要求,对于低频段和高频段的信号均可以实现精确测量,且没有幅相误差。针对波形抽样法测相提出了4种算法实现方案,并通过试验对每种方案进行验证,分析了其可行性和优缺点,得出了测相精度。试验表明,每种方案均能高效的实现测相功能,但测量结果的精度受其硬件电路和软件时序的影响而有所不同。     

Use of a sampling oscilloscope for velocity measurements and frequency comparisons of impulse acoustic surface waves

A simple method of phase-shift and velocity measurements of impulse surface waves in an active delay line is related. Using Lissajous's displays on a sampling oscilloscope, accurate measurements are performed, even though the transmitted signal is disturbed by r.f. leakage, echoes or spurious modes. The same technique is applied to the frequency determination of a convoluted signal in a nonlinear device.     

基于西门子SITRANS CV在线色谱分析仪的热值计量系统设计与应用

近年来国家颁布了一系列标准,规定逐步采用能量计量方式替代体积(或质量)计量方式进行贸易结算,贸易结算更趋科学、合理.本论文基于西门子SITRANS CV在线色谱分析仪设计了热值计量系统,包括样品处理系统、各种辅助配套设备及软硬件系统,实现了天然气热值测量的自动化、智能化和标准化.     

运用网络分析仪对滤波器和放大器进行准确测量

本文基于采用网络分析仪进行测试中经常遇到的测试考虑进行探讨。更好的使用网络分析仪以获得准确的测试结果。     

称重系统要求和分析

称重是工业领域非常普遍的一个应用,尤其在中国市场存在很多称重设备的设计和制造商。来自终端用户的产品千差万别,本文将着重分析、讨论这类应用的系统要求,探讨系统模拟输入前端的设计,因为这部分电路的性能直接决定了整个产品的精度水平。     

测量矩阵对管道超声压缩采样系统性能的影响

基于压缩传感(Compressed Sensing,CS)理论的管道超声压缩采样系统可用于解决长距离能源输送管道在役超声检测数据量大的问题,然而该系统的性能受到多种因素的影响,测量矩阵的多样性是最重要的影响因素之一。针对此问题,采用不同于约束等距性(Restricted Isometric Property,RIP)的统计方法分析了测量矩阵对系统性能的影响机理,提出了优质原子比和相对渡越时间误差作为衡量测量矩阵性能优劣的指标。管道超声检测实验结果表明,该项技术可作为压缩采样中测量矩阵的选择依据,为管道中进行超声检测信号压缩采样提供借鉴。     

矢量网络分析仪反射测量误差分析与修正

本文介绍了定向耦合器在矢量网络分析仪反射测量中的作用,分析了定向耦合器导致方向性误差的原因:耦合端出现的信号中包含有泄漏过去的非理想信号,在定向耦合器的耦合端口是被测件反射的信号,是理想的被测信号,但实际的定向耦合器并不理想,一小部分信号在经被测件反射之前便泄漏到了耦合端口.耦合端口的信号中包含有泄漏过去的非理想信号,...     

An algebraic formula for the output of a system with large-signal multifrequency excitation

A formula is derived for the output components of a nonlinearity which can be described by a power series, with complex coefficients and frequency-dependent time delays, when the input is a sum of sinusoids.     

Accurate measurement of small input resistances using aconventional network analyzer

Precise and accurate measurement of input resistance is essential to characterize small antennas whose input resistance is very small. However, this is very difficult because uncertainty, which includes imprecision and inaccuracy, sometimes exceeds the resistance being measured. A method for precise measurement of small input resistance using a conventional network analyzer is presented. Inaccuracy, which includes an actual conductor loss of the antenna under test (AUT), manufacturing error, and the residual systematic errors is then estimated. The former two sources of inaccuracy are obtained by comparing a radiation efficiency measurement of a small loop antenna using the Wheeler cap method with a calculated radiation efficiency. Using these values in the calculation of the input resistance, a true input resistance is acquired. Finally, the actual value of the residual systematic errors for each instrument is estimated by comparison between the true input resistance and the measurement     

扫频式频谱分析仪测量雷达发射功率误差分析

针对雷达功率测量问题,提出了运用频谱分析仪测量发射功率的方法并对该方法进行了误差分析。首先分析了频域测量发射功率的原理性误差,推导出了理论误差系数并进行了仿真分析,然后通过分析扫频式频谱分析仪的工作原理,列出了影响频谱分析仪实际测量精度的硬件要素,研究了硬件实现中的误差系数,最后得出了该方法测量功率所得结果与实际功率的关系表达式。     

热重分析仪温度测控方案的设计与实现

热重分析仪对温度的测量精度和控制精度的要求都很高,文中对温度的测量方案、温度控制器的设计等一系列过程进行了分析研究,设计了一套适合于热重分析仪的温度测控系统。其中,温度信号的采集采用以模数转换器AD7714为核心的解决方案,温度控制器则采用模糊PID控制,通过单片机实现温度的恒温、变温等控制。实验证明,该系统对于复杂条件下的高级温度测控表现出了优良的性能。     

MLSSA电声分析系统及其自动化改造

介绍美国DRA实验室研制的基于最长序列MLS信号测试技术的扬声器电声分析系统MLSSA。同时给出对其进行自动化改造的思路及方法，经改造后该系统能适应扬声器工厂生产线大批量测试产品频率响应的需要。对扬声器生产工厂的质量控制有一定意义。