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measuring frequency     
相关语句
  测频
     Vibrating-Wire-Sensors with Measuring Frequency System and Its Design Based on the Embedded μC/OS-Ⅱ System
     基于μC/OS-Ⅱ振弦传感器测频系统的设计
短句来源
     Vibrating-Wire-Sensors with Measuring Frequency System and Its Design Based on Embedded μC/OS-Ⅱ System
     基于μC/OS-Ⅱ的振弦式传感器测频系统的设计与应用
短句来源
     Based on the function of measuring frequency for 5G7216D, It expands the function of measuring period and time intervel.
     笔者在5G7216D原有测频功能的基础上,扩展了测周期,测时间间隔的功能。
短句来源
     On the basis of system described, a MPAD—Ⅱ (Microwave Pulse Automatic Digital)frequency meter has been developed with pulse width as small as 0.3μs in the s-band and c-band, accuracy of measuring frequency≤±0.5MHz.
     采用上述原理研制成功的S波段和C波段MPAD—Ⅱ微波脉冲自动数字频率计,其最小被测脉冲宽度为0.3μs,测频精度≤±0.5MHz。
短句来源
     The results adopted by the methods of measurement-averaging and measurement-fitting are showns that the precisions of timing and measuring frequency improve about 2~3 times than with the results of measurement methods of a single point, they arrive 30ns and 3×10 -13 /d respectively.
     采用测量平均法和测量拟合法的结果表明 ,定时精度和测频精度比单点测量法提高 2~ 3倍 ,达到 30ns和 3× 10 - 13/d。
短句来源
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  测量频率
     The Study of the Method for Measuring Frequency With 8031
     8031测量频率的方法研究
短句来源
     By redesigning the activating and measuring system, the measuring frequency ranges from 1×10\+\{-4\} Hz to 5×10\+2 Hz, while the frequence accuracy is better than 0 05%;
     主要通过对测控系统的重新设计 ,使测量频率范围达到 1× 10 - 4~ 5× 10 2 Hz ,变频精度达到 0 0 5% ;
短句来源
     This paper introduction one kind of method of measuring frequency and phase wity A/D.
     文中介绍一种利用A/D转换测量频率和相位的方法。
短句来源
     β relaxation was gradually obvious when the measuring frequency reached 1 MHz, and the effect of stray capacitance became obvious at about 6 MHz.
     β弛豫在测量频率1MHz左右开始明显,大于6MHz以后杂散电容效应开始显著。
短句来源
     However, the above measured results show that resistivities of water are strongly influenced by measuring frequency (12 Hz~100 kHz) and pressure acting on the solution in addition to concentration and temperature, which can result in a relative deviation of ±50% at most.
     但其测量结果同时表明,除浓度和温度外,测量频率(12Hz~100kHz)和加在溶液上的压力对淡水电阻率影响很大,相对偏差可达±50%。
短句来源
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  频率测量
     The 1Hz~1MHz input measured pulse signals of the digital frequency meter can be used for measuring frequency, period, pulse width and duty ratio, etc. The test results stably display on 3 seven-segment numeric tubes, and the measuring ranges may be switched over automatically. The measuring error is equal to or less than 0.1.
     该数字频率计的1Hz~1MHz输入被测脉冲信号具有频率测量、周期测量、脉宽测量和占空比测量等多种用途,其测试结果由3只七段数码管稳定显示,测试量程可自动切换,测量误差小于等于0.1%。
短句来源
     The project adopts a equally accurate measuring frequency technology,which is the first combination with μC/OS-Ⅱ operation system and equally accurate technology until this time.
     该方案引入了一种高效的等精度测频技术,并率先实现了μC/OS_Ⅱ操作系统与频率测量体系的实时结合.
短句来源
     Frequency measurement of vibrating wire sensors using the method of equally accurate measuring frequency
     用等精度测频方法实现振弦式传感器频率测量
短句来源
     A NEW METHOD OF MEASURING FREQUENCY FOR RELAY AUTOMATIC DEVICES
     一种供安全自动装置用的新的频率测量方法
短句来源
     The system mainly composed of AT89C2051 and MAX7219 realizes the measurement of frequency by utilizing the way of measuring cycle to measure low frequencies,the way of measuring frequency to high frequencies and the way of multi cycle synchronism to middel frequencies.
     以AT8 9C2 0 51及MAX72 19为核心组成频率测量系统 ,通过低频段采用测周法、高频段采用测频法及中频段采用多周期同步法实现频率的测量。
短句来源
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  测试频率
     When the measuring frequency is 35GHz, the minimum noise figure of the devices is 2.46dB and its correlated gain is 6.95dB. This is the design of 8mm three terminal solid state active devices firstly finalized in our country, and its performances have achieved the level of AF040N3—00 HEMT by Alpha company published in Dec. 1990.
     在测试频率为35GHz时,该器件的最小噪声系数为2.46dB,相关增益为6.95dB。 这是国内首次设计定型的8mm三端固态有源器件,其性能达到了1990年12月Alpha公司公布的AF040N3-00 HEMT的水平。
短句来源
     The relative dielectric constant of polyurethane was about 7 at 1kHz and it decreased with the increase of the measuring frequency.
     在1kHz频率下聚氨酯弹性体的相对介电常数为7左右,相对介电常数随测试频率的增加而降低。
短句来源
     Measuring Frequency with the 8031 Single—chip Microprocessor Minimum System
     应用8031单片机最小系统测试频率
短句来源
     The vector network analyzer was used to measure the complex permeability and dielectric constant of the samples in the frequency range of 0.1-6.0GHz, the complex dielectric constant and the real part of permeability decrease with measuring frequency increasing, very obvious resonance peaks were observed in μ" -f curves.
     采用HP8753E网络分析仪测定了微晶玻璃陶瓷在100MHz~6GHz范围内的介电常数及其磁导率,其复介电常数值、磁导率实部都随测试频率的增加而减小,其磁导率虚部~f曲线上显示出明显的自然共振峰。
短句来源
     From the result of the experiment, the measuring frequency range of this method is 1MHz~200MHz; the measuring accuracy of series resonant frequency is ± 2ppm. Repeated measuring experiments, the result shows that the maximum standard difference is 0.5ppm.
     经实验验证,本测试系统的测试频率范围1MHz~200MHz,相位检测的精度能够满足串联谐振频率的测试精度±2ppm的要求,重复精度大于0.5ppm。
短句来源
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      measuring frequency
    The noise immunity of a method of measuring frequency, based on comparing the form of the signal spectrum in a Fourier basis with a set of standard spectra, using computer modeling is presented.
          
    The filtering of deterministic signals when measuring frequency-time parameters is considered.
          
    A procedure for measuring frequency response of two-terminal networks in the infrasonic range
          
    Increasing the efficiency of measuring frequency by the digital method
          
    1.The above method of measuring frequency drift with an appropriate selection of circuit parameters, in particular of frequencyfif, ensures an error not exceeding 1-2%.
          
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    From noise voltage frequency spectral data Ss(ω) taken from carrier channels along many transmission lines in China, relative power spectra are calculated. Then by step-by-step integration method, the equations for corresponding correlation coefficients, or normalized autocorrelation ρ ate derived in terms of Ss(ω) and difference time τ. The shapes of the calculated ρ-τ curves are in general irregular, but in several cases where maximum Ss(ω) occurs at lower measuring frequency, p-r curves resemble the...

    From noise voltage frequency spectral data Ss(ω) taken from carrier channels along many transmission lines in China, relative power spectra are calculated. Then by step-by-step integration method, the equations for corresponding correlation coefficients, or normalized autocorrelation ρ ate derived in terms of Ss(ω) and difference time τ. The shapes of the calculated ρ-τ curves are in general irregular, but in several cases where maximum Ss(ω) occurs at lower measuring frequency, p-r curves resemble the shape of damped cosinusoid e-aτ cos 2 πf τ. Finally the following parameters are calculated: thedifference time τ1, τ2 and τ3 at which | ρ|≤, | ρ|≤1/e2 and | ρ|≤ 0.05, exponentialattenuation constant a, average frequency and no. of zero crossings N, in intervals τ1, τ2-τ1, τ3-τ2 and τ3. It is found N/τ3f= 2, τ3 determines the upper limit of frequency ofsignal envelope for optimum reception. When higher carrier frequency (>40000 Hertz) is used, τ3 is usually smaller, this upper frequency limit 1/τ3 becomes higher.

    根据在我国各区电力线路上测试的噪声频谱密度数据Ss(ω),先算出相对功率频谱密度,再用逐段积分法,求出相关系数ρ与相差时间τ的关系曲线。 在大值由Ss(ω)集中在一个较低频率的几个情况下,ρ-τ曲线的形状相当接近于e~(-ατ)cos 2πfx;在大值Ss(ω)比较分散的一般情况下,它的振荡形状是很不规则的。 最后算出|ρ|开始小于1/e,1/e~2与0.05的相关时间τ_1,τ_2与τ_3,以及在分段过程τ_1,τ_2-τ_1,τ_3—τ_2和整个过程τ_3中的平均振荡频率f,指数衰减系数α,过零点数目N等,其中N/τ3f很接近于2。第一分段τ_1中所得的参数和整个过程τ_3中所得的平均参数相差很远,因而第一分段的参数不能表示整个过程的特征。τ_3决定着通道中不积累误差的载波包络的频率高限。一般地讲,如果在通道中使用较高的载频(4万赫以上),所得的τ_3较小。因而可用较高的载波包络频率,也就是信号频率可以提高些而不致降低信号噪声比。

    The frequency dependence of A.C. conductance of organic solid thin films have been discussed. It is pointed out that the dependence of conductance on the square of frequency is an artifact due to the electrode contact resistance and the capacity of the film. In this paper a method of an added external resistance is proposed to evaluate the electrode contact resistance and thereby the experimentally measured frequency dependences of conductance and capacity of the film could be corrected for...

    The frequency dependence of A.C. conductance of organic solid thin films have been discussed. It is pointed out that the dependence of conductance on the square of frequency is an artifact due to the electrode contact resistance and the capacity of the film. In this paper a method of an added external resistance is proposed to evaluate the electrode contact resistance and thereby the experimentally measured frequency dependences of conductance and capacity of the film could be corrected for the effect of electrode contact resistance. In order to characterize the A.C. conductance of organic solid thin films three parameters are suggested. That is, the D.C. specific conductance σd.c. at extremely low frequencies, the exponent n in the expression σ(f)∝ fn for the region of higher frequencies and the value of fx at which the straight line on the lgσ-lgf plot intersects the horizontal line σ=σd.c. For a solution cast film of poly-vinylcarbazole (PVK)-2,4,7-trinitrofluorenone (TNF) (1:0.75) charge transfer complex and an evaporated film of copper phthalocyanine (PcCu) the following results were obtained:

    本文讨论了有机固体薄膜交流电导的频率依赖性,指出在较高频率下,电导正比于频率两次方的依赖性,是由于电极接触电阻和薄膜电容所引致的假象。作者建议了一种外加串联电阻法来求取电极接触电阻值,从而使电导和电容的频率依赖性实验数据得到改正。提出了表征有机固体薄膜交流电导特性的三个参数,即在极低频下的直流电导率σ_(d.c.)值、在较高频区σ(f)∝f~n中的n值和在lgσ-lgf图上高频区直线与σ_(d.c.)水平线的交点f_x。对聚乙烯咔唑(PVK)-2,4,7-三硝基芴酮(TNF)(1:0.75)电荷转移复合物薄膜和酞菁铜(PcCu)蒸发膜进行实验测定的结果,得到PVK-TNF(1:0.75):(σ_(d.c)=1.9·10~(-16)(Ω·cm)~(-1),n=0.96,f_=6.1·10~(-3)Hz(14℃);PcCu:σ_(d.c.)=1.6·10~(-9)(Ω·cm)~(-1),n=1.2,f_x=1·10~5Hz(17℃)。

    This paper discribed the random errors of the measuring frequency of the model JSZ-4 Dual Channel Doppler Receiver by simple mathematical model The accuracy of the measuring frequency of the same type instrument in Shaanxi Astronomical Observatory was calculated.

    本文运用较简单的数学模式讨论了JSZ—4型双频多卜勒接收机测频的随机误差,并对陕西天文台同类型仪器的测频精度进行了归算。

     
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