This paper proposed the theory of digital counting instantaneous frequency measurement and analyzed the error of frequency measurement.
文章介绍了一种用直接数字计数测量瞬时频率的原理，并进行了测频误差分析。
The measurement error of differential absorption laser radar caused by the shift of its center frequency in measuring atmosphenc density has been discussed particularly.
详细地讨论了微分吸收激光雷达测量气体密度时中心频率的漂移所引起的测量误差。
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。
Frequency measurement is usually implement by accounting the measured signals and standard signals, thus quantizing error becomes the main source of measuring error.
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。
The error of measuring Brillouin frequency shift based on brim detecting technology has great influence on the measurement precision of sea surface temperature.
采用边缘探测技术测量布里渊频移量的误差会对海表温度测量精度带来很大影响。
The Maximum permissible error when the working frequency of Resistor is equal to or lower than the measurement frequency.
电阻箱的工作频率等于或低于测试频率上限时的最大允许误差。
The error analysis shows that the measurement error is caused by the noise of the accelerometer, discrete double integration, noise of beacon and frequency characteristic error.
对线加速度计辅助惯性姿态角测量的误差分析表明，测量误差由加速度计噪声、二次积分离散化、信标噪声和加速度计频率特性误差组成。
The elaborate error analysis of synchronous frequency measurement method is presented and some amelioration of the method based on the analysis is proposed.
对同步测频法进行了详尽的误差分析并由此对该方法做了改进。
The testing error and the reason of error are analyzed, compared with the results received by the sweep-frequency measurement method.
将微悬臂梁和微薄膜振动特性的测量结果与频率扫描法的测试结果进行了比对，对产生的误差及误差来源进行了分析。
The test results prove that by using the system the frequency measurement accuracy can achieve thousandth and the relative error of measurement within 1%.
测试结果证明采用该系统对频率测量的精度可以达到千分之一，测量的相 对误差不大于1％。
The test results show that by this structure the working frequency bandwidth of the transducer is expanded and the dynamic measurement error reduced.
试验结果表明，这种结构可较大地展宽传感器的工作频带。
The test results show that by this structure the working frequency bandwidth of the transducer is expanded and the dynamic measurement error reduced.
试验结果表明，这种结构可较大地展宽传感器的工作频带。
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