Quantum-data 801GC Instrukcja Użytkownika Pobierz pdf (Strona 87)

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PulseBar (TV formats only)

Description: The image looks like two vertical lines followed by

a wide vertical bar on a display’s screen. The first

line is a sine-squared modulated pulse that fades

from black to red and back to black. The pulse is

20T for PAL and 12.5 T for NTSC formats. The second

narrower line is a 2T white sine-squared pulse. T =

100 nSec for PAL and 125 nSec for NTSC formats.

The wide bar is white with sine-squared edges.

Test: Video System Testing

This multi-purpose pattern can be used with other

instruments to check television K factors. The

modulated pulse can be used to check chrominance-

to-luminance delay and gain. The narrow white line

can be used to measure short term linear distortion

(K2T). One scan line of the image, as it would appear

on a waveform analyzer, is shown here:

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 355 356

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