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Vol. 112, Issue 1, January 2010, pp. 95-106




Performance Evaluation and Robustness Testing of Advanced Oscilloscope Triggering Schemes


1Shakeb A. Khan, 2Alka NIGAM, 3A. K. AGARWALA, 4Mini S.THOMAS

1Department of computer Engineering, King Khalid University, Abha, Saudi Arabia, 09650087393

2Department of Electrical Engineering, Jamia Millia Islamia, New Delhi, India

Tel.: 9810877220

3IDDC, Indian Institute of Technology, New Delhi, India

Tel.: 98710305653

4Department of Electrical Engineering, Jamia Millia Islamia, New Delhi, India

Tel.: 9810424609

E-mail: khanshakeb@yahoo.com, alkanigam1@gmail.com, agarwala@iddc.iitd.ac.in, min_st@yahoo.com



Received: 17 December 2009   /Accepted: 22 January 2010   /Published: 29 January 2010


Abstract: In this paper, performance and robustness of two advanced oscilloscope triggering schemes is evaluated. The problem of time period measurement of complex waveforms can be solved using the algorithms, which utilize the associative memory network based weighted hamming distance (Whd) and autocorrelation based techniques. Robustness of both the advanced techniques, are then evaluated by simulated addition of random noise of different levels to complex test signals waveforms, and minimum value of Whd (Whd min) and peak value of coefficient of correlation(COCmax) are computed over 10000 cycles of the selected test waveforms. The distance between mean value of second lowest value of Whd and Whd min and distance between second highest value of coefficient of correlation (COC) and COC max are used as parameters to analyze the robustness of considered techniques. From the results, it is found that both the techniques are capable of producing trigger pulses efficiently; but correlation based technique is found to be better from robustness point of view.


Keywords: Oscilloscope, Triggering, Weighted hamming distance (Whd), Autocorrelation, Coefficient of correlation (COC), LabVIEW, MATLAB


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