被测信号为脉冲调制信号。
使用零差检测跟踪相位即可得到被测信号。
计数式频率计的选通门一般与被测信号是不相关的。
The strobe signal is not commonly associated with the signal tested.
测量的灵敏度是可以探测出的被测信号的最小变化量。
The sensitivity of a measurement is the smallest change of the measured signal that can be detected.
这要求被测信号中的噪声为白噪声或至少接近白噪声。
The noise in the measured signal is constrained to "white" noise or at least nearby "white" noise.
系统需要的被测信号，一般可分为开关量和模拟量两种。
The measured signal needing by system popularly can be divided into two kinds which are on-off quantity and analogy quantity.
数字频率计是直接用十进制数字显示被测信号频率的一种测量装置。
The digital frequency meter is a device which is one kind of using decimal system digital directly display the signal frequency.
利用噪声信号与参考信号不相关的原理，有效地提取微弱被测信号。
Using the principle of the reference signal being uncorrelated to the measured signal, the latter could be extracted easily.
而对被测信号进行调制使其与参考信号相关是实现锁相检测的关键。
The key point to realize the technique is to modulate the detected signal and make it related to the reference signal.
信号由多用表卡、示波器卡测试并获取。被测信号由专用接口转接。
The signal was tested and obtained by a multi-meter card or oscillograph card, tested signal was transferred through special interface.
当被测信号频率较低时，需要很宽的选通门才能得到较高的测量精度。
If the signal frequency to be measured is low, wide strobe gate is required for high measurement precision.
文中详细地分析了被测信号的频率和计数脉冲的频率与测量精度之间的关系。
This paper particularly analyze the relation between frequency of measured signal and frequency of count pulse on measuring precision.
根据Nyquist定理，采样率必须是被测信号最高频率分量的两倍以上。
According to the Nyquist Theorem, the sampling rate must be more than twice the maximum frequency component of the signal being measured.
介绍了一种处理被测信号为线性、连续、缓慢变化的较为简单的数字滤波方法。
A simple method of digital filtering which applies to processing linear, continuous and slow changing signal is introduced.
该方法同时旋转多个天线单元的信号源的相位，能够使被测信号的起伏显著增加。
This method synchronously rotates the sources 'phases of more than one antenna element, and makes the signal vary more significantly.
微波测量过程中，对不同电平的被测信号进行电平控制，是测量过程的重要步骤。
In the process of microwave measurement, adjusting the level of the measured signal is an important part.
本文针对这一特定对象引入了脉冲涡流法，结合被测信号特点进行处理，有效提取了特征值。
Pulsed eddy current is used to test this special object. After signal processing, features are extracted effectively.
交流采样是按一定规律对被测信号的瞬时值进行采样，再用一定的数值算法求得被测量的值。
The AC sampling is carried out testing the AC signal based on the certain regulation, and desired the values of the AC signal based on the certain mathematical method.
若开关、互连电缆和测试夹具没有合适的屏蔽，所产生的杂散信号（偏移）将威胁到被测信号。
Without proper shielding of the switches, interconnecting cables, and test fixturing, spurious signals (offsets) may be generated that will compromise the signal being measured.
本文在对被测信号进行分析的基础上，介绍了该装置研制过程中所遇到的一些问题的解决方法。
On the basis of analysis of detected signals, this article presents the resolvents of certain problems coming in the process of device development.
针对单点测试，可灵活地根据被测信号和应用环境的特殊要求来设定参数并有效记录存储数据。
During single test, the system can flexibly set parameters and effectively record data with the special requirement of the present environment and the tested signal.
频率测量一般是通过对被测信号和标准信号计数实现，因此量化误差是引起测量误差的主要原因。
Frequency measurement is usually implement by accounting the measured signals and standard signals, thus quantizing error becomes the main source of measuring error.
根据等精度测频原理，本设计克服了基于传统测频原理的频率计的测量精度随被测信号频率的下降而降低的缺点。
Based on equal precision frequency principle, this design avoids traditional cymometer's defect that precision declines as the frequency measured declines.
该方法可以有效的消除因本振信号频率漂移及闸门信号与被测信号的非同步引起的测相误差，同时提高了测量速度。
The phase detecting error caused by local oscillator frequency drift and non-synchronization of measurement signal and gate signal is eliminated and the measurement speed is improved at the same time.
该频率计利用等精度的设计方法，克服了基于传统测频原理的频率计的测量精度随被测信号频率的下降而降低的缺点。
The cymometer makes use of equal-accuracy design that can overcome the disadvantage of traditional measuring principle, which precision declines as measured signal frequency does.
在采用信号增强技术降低观测噪声后，利用总体最小二乘方法估计被测信号参数可以得到比传统方法更好的分析结果。
After reducing the noise by the technique of signal enhancement, the more extract approximation results than traditional approach can be achieved with the TLS method.
本文提出一种动态测试中单次性信号测试数据的贝叶斯推断方法，其中单次性的被测信号和输出信号被认为是随机过程的现实。
The paper presents a kind of bayesian inference of simple signal in dynamic measurement. The simple measured signals and output signals are thought of as realizations of stochastic process.
锁相放大技术对被测信号进行窄带放大，锁相放大器结合示波器输出了被测信号的周期变化部分，实现了光热法测量中微弱信号的测量。
By narrowing the bandwidth of the signal and amplifying it by a lock-in amplifier, the fluctuating components of the signal can be shown on an oscillograph with lock-in amplifier.
如果输入端的交流电压很大，其一部分信号被整流，于是在被测的直流信号中产生了误差。
If the AC voltage at the input is large, part of this signal is rectified, producing an error in the DC signal being measured.
级联配置的一个缺点是信号要经过多个开关触点才能到达被测装置，会造成信号的损耗更高。
A disadvantage of the cascade configuration is that the signal may pass through more than one switch contact to the device under test, causing higher losses in the signal.
应用推荐