John G. Webster's Electrical Measurement, Signal Processing, and Displays PDF

By John G. Webster

ISBN-10: 0849317339

ISBN-13: 9780849317330

The CRC ideas and functions in Engineering sequence is a library of handy, low in cost references sharply inquisitive about specific engineering issues and subspecialties. each one quantity within the sequence includes chapters rigorously chosen from CRC's bestselling handbooks, logically equipped for max comfort, and thoughtfully priced to slot each budget.

Electrical size, sign Processing, and monitors describes using tools and methods for sensible dimension of electromagnetic variables, sign processing apparatus and parameters, and diverse kinds of screens, from cathode ray tubes to LED units. For this quantity, chapters appropriate to those subject matters have been culled from the bestselling dimension, Instrumentation, and Sensors guide and revised through their unique authors to convey them completely brand new.

This is a concise, well-illustrated, and hugely sensible reference. It units forth the foundations, formulation, and equations engineers and scientists desire for fixing the instrumentation and dimension questions they come upon in perform, relatively whilst difficulties come up in parts outdoors their very own specialties.

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Now, one needs to be concerned only with the bandwidth required to make the measurement. 29 shows the effect of oscilloscope bandwidth on the display of a 50 MHz square wave. The oscilloscope’s bandwidth should be >2¥ the fundamental highest frequency signal to be measured. The bandwidth of the scope’s vertical system can affect the scope’s ability to correctly display narrow pulses and to make time interval measurements. 52. 5 ns. 5 ns edges. This will affect the scope’s measurements in two ways.

When modern ADCs and DSPs are employed, a 500 kHz bandwidth can be obtained. Wider bandwidths can be obtained, but with a lower ADC resolution, and hence with a lower accuracy. 20 Block diagram of a modern digital meter. © 2004 by CRC Press LLC 1733 FrameBook Page 21 Tuesday, June 3, 2003 10:03 AM Voltage Measurement 1-21 Frequency Response of Ac Voltmeters. When the frequency response of ac voltmeters is taken into account, a distinction must be made between the analog voltmeters (both electromechanical and electronic) and digital voltmeters, based on DSP techniques.

This will affect the scope’s measurements in two ways. First is narrow pulses. 30 shows the same 5 ns wide pulse being displayed on oscilloscopes of 500 MHz and 60 MHz bandwidths, and the effect of the lower bandwidth on this event that is closest to the risetime of the slower scope is apparent. The second is fast time interval measurements. A measurement of signal risetime is an example. 53. 53. The scope would have made this measurement with a 6% reading error before any other factors, such as time base accuracy, are considered.

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Electrical Measurement, Signal Processing, and Displays (Principles and Applications in Engineering) by John G. Webster


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