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Creating and Using Math Waveforms

TDS5000 Series User Manual

3- 163

-- 1 0

Hanning scallop loss is 1.42 dB

Frequency bins

-- 1

-- 2

-- 3

-- 4

-- 5

-- 6

-- 7

-- 8

-- 9

Figure 3- 49: Example of scallop loss for a Hanning window without zero f ill

Nearest Side Lobe: This is the difference in magnitude between the spectral lobe

peak in the spectrum and the next side lobe that occurs due to energy leakage.

Different windows have different leakage characteristics. The more narrow the

resolution bandwidth of the window the more leakage in the spectrum.

Zero Phase Reference: This is the position in the time domain gate that is the

reference point for phase in the output spectrum. That is, if a sine wave input has

its peak at the zero phase reference position, then it reads out as zero phase in the

spectrum. If the phase is to be correct when doing impulse response testing, the

impulse in the time domain must be located at this position in the gate interval.

Coefficients: These are used to generate the windows which are constructed from

a cosine series. For the Gaussian window, the value of “a“ is given instead of a

set of coefficients. You can find descriptions of cosine series windows in the

Handbook of Digital Signal Processing Engineering Applications by Elliot.

ISBN 0--12--237075--9.

Tektronix TDS5052 User Manual

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