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May 2006 [Test & Measurement] Measure Frequency With Time-Stamping Counters Frequency counters at one time were considered fundamental measurement tools almost in the class of a voltmeter. They offered the capability of measuring a CW signal with fairly high resolution, depending upon modulation, and were largely used for calibrating oscillators. As frequency counters evolved, instruments were developed with pulse-measurement capability and wider measurement bandwidths capable of handling measurements on modulated waveforms. Modern frequency counters... May 2006 [Test & Measurement] Understanding Linear Regression The CNT-90 timer/counter/analyzer employs linear regression techniques for improved measurement resolution. The inclination of the regression line corresponds to the estimated average period time of the input signal (T*), and is calculated as: where: xk = the number of cycles in sample k; yk = the time-stamping value in sample k; and n = the number of samples in the... |
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