Measurement Tools
Compute systems are extremely complex, requiring comprehension at many evels Measurements, too. must be made at different levels to provide a complete system charaderizaticr For a particular metric, it is important to choose the best tool The tools can be compared ,n terms of what they can measure their ease of use, the overhead they incur and their sampling frequencies Table t compares the tools for each category Hardware measurement tools analyze signals trom tne machine under test Most...
Analyzer Synthesizes Frequency Response of Linear Systems
A COMPLETE CAPABILITY for synthesizing the frequency response of linear systems based on their pole-zero, pole-residue, or polynomial model is included in the HP 3562A Signal Analyzer. This synthesis capability includes table conversion, the ability to convert automatically between the three models. The frequency responses can be frequency scaled and system lime delays can be added. The designed system frequency responses are synthesized with exactly the same frequency points as those used by...
Curve Fitter for PoleZero Analysis
THE CURVE-FITTING ALGORITHM in the HP 3562A Analyzer finds a pole-zero mode of a linear system based on the system's measured frequency response. The curve fitter does this by calculating a weighted least-squares fit of a rational polynomial to the measured frequency response Then he polynomials in the denominator and numerator can be factored to find the poles and zeros of the measured system or alternatively the pole-residue or polynomial form . Fig. 1 demonstrates actual curve fits by the HP...
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and all input data is processed. Decreasing the span further results in data collection times longer than the data processing time. These measurements are said to he real-time. Designing for a real-time bandwidth of 10 kHz single channel requires data processing times of less than 80 ms. It was apparent that a single processor could not perform the many computational tasks fast Fourier transforms and floating-point calculations in particular that are required within this amount of time....
Demodulation Example
Fig 1 shows the 'instrumentation for measuring the distortion ol an ord'nary cone loudspeaker, in which both amplitude and phase distortion occur. The technique is 10 apply the sum of a low-frequency voltage and a midrange-lrequency voltage to the speaker, and then to demodulate the components that appear around the midrange tone. Here, the midrange signal becomes the carrier, and the low-frequency tone generates the modulation sidebands In any speaker system of this type, the cone suspension...
LowFrequency Analyzer Combines Measurement Capability with Modeling and
HP's next-generation two-channel FFT analyzer can be used to model a measured network in a manner that simplifies further design. by Edward S. Atkinson, Gaylord L. Wahl, Jr., Michael L. Hall, Eric J. Wicklund, and Steven K. Peterson THE NAME FFT ANALYZER has been applied to a category of signal analysis instruments because their dominant in some cases, their only analysis feature has been the calculation of the fast Fourier transform of the input signals for spectrum and network response...