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 Wysłany: Sob 16:37, 11 Gru 2010 Temat postu: ugg milano Trigger delay line of the waveform reco |
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Trigger delay line of the waveform recorder Experimental Study
, With the harmonic amplitude, noise, jitter reduction and narrowing of the waveform. Specific evaluation process, refer to the literature [3]. To further reduce the measurement uncertainty can be conducted using digital pre-filtering. On the linearity of uncertainty, may refer to [5] deal, the paper will not repeat them. 4 discussion from the above process can be seen that the sinusoidal excitation method described in this article to trigger the evaluation of delay and jitter, phase difference measurement is based on concepts and methods, are models of methods of measurement. Compared with previous methods, does not require a square wave pulse signal, requiring only a sinusoidal signal source, measurement simple, effective, easy to implement automated measurement,[link widoczny dla zalogowanych], eliminating the need for additional source of delay in the signal conditioning part, to trigger the measured waveform recording instrument Source No special requirements. External triggering and measurement channels can be triggered. Trigger delay and jitter will be directly traceable to the signal frequency,[link widoczny dla zalogowanych], can be obtained from the principle of a higher measurement accuracy. And, in the measurement sequence, the position does not require a known trigger point. These are the methods described in this paper the special strengths. From the results, comparison, measurement methods described in this article can trigger the time delay, delay jitter, delay line and so the measurement and evaluation, with good measurement accuracy. However, in the realization of measurement, due to changes in measurement conditions, the accuracy of measurement results for impact. Usually chosen as high as possible trigger signal frequency, high sampling rate, low distortion of the trigger signal, will be to reduce jitter effects, reducing the delay nonlinear, reduced sampling error and increase the stability of results, better measurement results. Trigger delay and waveform records because the measuring conditions of a certain relevance, and therefore, people evaluate their value, it will be the main source by adjusting the frequency and other parameters to reduce measurement error, usually based on the measured magnitude of the trigger delay selected frequency as high as possible in order to obtain the corresponding phase difference as large as possible and as low as possible measurement error. 5 Conclusion In summary shows, this is the trigger delay line sine wave excitation and trigger jitter of the precise degree of evaluation methods attempt to measure the means and technology to solve the phase triggered delay line of problems with the accurate measurement of jitter in order to be able to the most common source for maximum measurement accuracy, and easy to achieve a more simple and convenient automated measurement. Because China's national standards and regulations there is no delay line on the trigger jitter measurement of the degree and evaluation methods, the work described in this article are available on the trigger delay and jitter related personnel interested in reference and experience. References [1] MichaelSoudem, etc. , IEEEStd1057-1994, IEEEStandardforDigitizingWaveformRecorders [S]. [2] JohnPDeyst, TMichaelSoudersandOtisMSolomonJr. , BoundsonLeast - SquaresFour ・-ParameterSine - FitEn ~ l'SDuetoHarmonicDistortionandNoise [J]. IEEETransactionsonInstrumentationandMeasurement, June1995, 44 (3) :637-642. [3] Liang Zhiguo. Delay time difference between channels, measurement uncertainty [J]. Measurement, 2005,[link widoczny dla zalogowanych],26 (4) :354-359. [4] LiangZhiguo, ZhuJijie. ADigit ~ FilterfortheSingleFrequen-cySinusoidSeries [J]. TransactionofNanjingUnivemityofAeronautics & Astronautics, 1999,16 (2) :204-209. [5] Liang Zhiguo, Li Xinliang,[link widoczny dla zalogowanych], Meng wind. Independent of the laser vibrometer measurement uncertainty of linearity [J]. Measurement, 2008,29 (3) :242-247. [6] GB/T15289-1994, digital storage oscilloscope General and test methods [S]. [7] GB/T6585-1996,[link widoczny dla zalogowanych], cathode ray General specification [S]. [8] JJF1057-1998, Digital Storage Oscilloscope calibration standards [S]. [9] JJF1048-1995, data acquisition system calibration specification [S]. '
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