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Creating and Using Math Waveforms

CSA7000B Series & TDS7000B Series Instruments User Manual

3- 195

-- 1 0

Hanning scallop loss is 1.42 dB

Frequency bins

-- 1

-- 2

-- 3

-- 4

-- 5

-- 6

-- 7

-- 8

-- 9

Figure 3- 54: Example of scallop loss for a Hanning window without zero fill

H 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 ener gy

leakage. Different windows have different leakage characteristics. The more

narrow the resolution bandwidth of the window, the more leakage in the

spectrum.

H 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.

H Coefficients. These are used to generate the windows which are constructed

from a cosines 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 Handbook of Digital Signal Processing Engineering Applica-

tions by Elliot. ISBN 0--12--237075--9.

Tektronix CSA7404B User Manual

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