浅谈逻辑分析仪

本文主要介绍数字系统的两个方面。即时域和数域以及对它们进行测试所采用的方法（定时分析和状态分析）然后介绍逻辑分析仪是如何解决数字电路故障查寻的问题。     

An Easily Implementable Network Analyzer

A simple network analyzer is devised which makes use of the sampling and time-division multiplexing techniques to detect a signal in a phasor form. Composed of a binary 90° phase shifter and a coherent detector, the detection system involved allows the real and imaginary parts of a scattering parameter to be detected sequentially. The performance of a prototype analyzer supports the detection principle. The error analysis is also given to specify the operation of a binary 90° phase shifter needed for the analyzer to assure a prescribed measurement accuracy.     

An Accurate Wide-Band Automatic Waveform Analyzer

This paper presents accurate and quantitative measurements of waveform parameters and eye pattern which is important as an evaluation parameter of digital transmission characteristics in the development of a wide-band automatic waveform analyzer from dc to 10 GHz. The measurements and-error of transfer characteristics by using FFT is also described. New techniques are adopted in averaging, calibrating, and compensating the time axis for the accurate measurements. Relevant software offers a method for quantitative measurement. The methods have made it possible to measure the waveform parameters which are about ten times more accurate than can be obtained through conventional oscilloscopes. In the quantitative evaluation of eye pattern, the measuring error has been improved from 10 down to 2 or 3 percent as compared with measurements by sight using a conventional oscilloscope. An equation which gives the approximate value of the error in the measurement of transfer function in the frequency domain from the time-domain pulse response is shown and confirmed to correspond with the actual case.     

双六端口网络分析仪的误差分析

本文给出了双六端口网络分析仪的误差分析方法,详细讨论了测量反射系数、衰减和相移时各个分项误差大小的估计。     

MOS-FET Analyzer

The purpose of the analyzer is to save time and effort in determining the following basic MOS-FET (metal-oxide-semiconductor field-effect transistor) parameters: the performance factor ?, the corresponding threshold voltage VGS(T), and the transconductance gm. The MOS-FET analyzer comprises a square-root calculator whose output is displayed on the x-y system of a scope, and thereby offers a readout of the above three quantities of the MOS-FET.     

一种使用矢量网络分析仪的阻抗测量改进方法

基于反射法理论提出了一种使用矢量网络分析仪测量集总参数元件阻抗的方法,引入阻抗匹配电路,拓宽了矢量网络分析仪的阻抗测量范围.通过对匹配电路二端口网络模型中参量A的分析,给出相应的被测元件的阻抗计算式,消除了夹具对测量结果的影响.采用矢量网络分析仪直接测量法和该阻抗测量法分别测量了5种不同阻值的金属膜电阻,结果表明,该阻抗测量方法的测量精度高于矢量网络分析仪直接测量的精度,可在30 kHz～100 MHz频率范围内实现几欧至千欧阻抗的精确测量.     

A Probability Density Analyzer

An inexpensive probability analyzer is designed for the measurement of the probability density function and distribution functions of random signals. The operation principle of the system is explained through detailed discussion of each active stage. It utilizes Schmitt triggers with low hysteresis to provide good accuracy. The output of the analyzer is measured by using a counter. Experimental probability density and distribution functions are obtained for a sinusoidal input, and the measured results are in good agreement with the theoretical functions.     

Harmonic Analyzer/Generator

A method of measuring the phase angle and magnitude of "n" harmonics corresponding to a periodic signal is described. The method includes the generation of sinusoidal bursts to reproduce significant components of distorted and complex signals; burst amplitude, burst initial phase, and burst frequency correspond, respectively, to harmonic amplitude, harmonic phase angle, and harmonic frequency.     

定时DIR成色剂

本文中给定时DIR成色剂从广义、狭义两方面下了定义。介绍了定时DIR成色剂的类型、合成、应用、反应机理,尤其是重点介绍了具有双定时基成色剂的情况。     

基于VB和GPIB接口的阻抗分析仪及多功能万用表自动测试系统

本文通过一个应用于介电温谱测量的实例,详细介绍了在Visual Basic环境下,利用GPIB接口和VISA库联合开发的一个阻抗分析仪、多功能万用表自动测试系统。该系统实现了对材料介电性能随温度变化的自动测试及可靠的数据管理。     

智能色相分析仪的设计

介绍了一种基于模式识别技术的油墨色相智能分析系统,简述了色相分析原理,介绍了色相分析仪的硬件组成,软件设计及程序流程,最后给出了色相分析仪的操作界面.研究结果表明对油墨的配色与管理起到良好的效果.     

A Dynamic Electroencephalogram Frequency Analyzer

A microprocessor is used for real-time frequency analysis of an EEG amplifier output through the use of a 32-point fast Fourier transform (FFT). The sixteen frequency components are gain equalized, then summed into the conventional delta, theta, alpha, and beta bands. A simultaneous display of successive processed FFT outputs on a storage oscilloscope along with base line references is of substantial aid in determining the relative activity in each. Simple changes in test conditions show considerable activity in the delta, theta, and beta bands. The alpha band surprisingly was relatively constant for many subjects through a large range of test conditions. Permanent copy is provided by photographing the CRT display or by direct printout of intermediate and/or final results on a Teletype or high-speed printer. System design parameters and preliminary results are discussed.     

Discrete Wavelet Transform Signal Analyzer

This paper addresses the problem of processing biological data, such as cardiac beats in the audio and ultrasonic range, and on calculating wavelet coefficients in real time, with the processor clock running at a frequency of present application-specified integrated circuits and field programmable gate array. The parallel filter architecture for discrete wavelet transform (DWT) has been improved, calculating the wavelet coefficients in real time with hardware reduced up to 60%. The new architecture, which also processes inverse DWT, is implemented with the Radix-2 or the Booth-Wallace constant multipliers. One integrated circuit signal analyzer in the ultrasonic range, including series memory register banks, is presented.     

电解质分析仪检测方法

本文对电解质分析仪进行计量性能评价,提出了检测方法。     

智能型镀锡量测量仪的研制

依据库仑原理研制了智能型镀锡量测量仪,采用计算机记录阳极溶解曲线,可同时测量试样双面或单面的镀锡量,实现了以自动和人工方式判断溶解终点。仪器测试结果的重现性优于±0.1g/m~2,RSD<1％。     

A Digital Power Spectrum Analyzer

In this paper we develop a new algorithm for a digital power spectrum analyzer. The advantage of this new algorithm is that it makes possible the lowering of the average sampling rate without incurring large errors.     

调制域分析仪与测量

针对初次使用调制域分析仪的状况,详细的介绍调制域分析仪的主要用途和主要指标,以及使用调制域分析仪的基本步骤和注意事项.使初次使用者能够更加快速的熟悉调制域分析仪的各项功能和操作.     

An Improved Method for the Evaluation of Uncertainty of Channel Power Measurement With a Spectrum Analyzer

This paper discusses issues in the uncertainty of power measurement performed with a superheterodyne spectrum analyzer. In particular, the channel power technique is considered, and an original and effective method is proposed based on the "Guide to the Expression of Uncertainty in Measurement" for the uncertainty evaluation of channel power measurement. The method is based on the measurement of some suitable parameters associated to the input signal's spectrum and the use of a proper postprocessing formula. It allows a user to greatly simplify the computation of measurement uncertainty without loss of accuracy. The effectiveness of the method is verified experimentally. In particular, experiments are performed involving both laboratory- generated signals and some typical real-world digital communication signals. Helpful information and hints for the optimization of the spectrum analyzer setup and the reduction of uncertainty are Anally provided.