Quantum Data 802R Podręcznik Użytkownika Pobierz pdf (Strona 625)

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802BT/802R Video Test Generator User Guide 615

Burst (TV formats only)

Description The left side starts with reference white (+100 IRE) and black (+7.5 IRE) levels. This is

followed by six bursts of sine waves. Each burst is at a different frequency, forming vertical

lines of various widths. The frequencies, going from left to right, are 0.5, 1, 2, 3, 3.58, and

4.43 MHz.

Test Frequency response

Method When viewed on a TV screen, the peak intensities of all of the bursts should match the

white reference level. The darkest portions between the peaks should match the black

reference level.

The image can also be used with a TV waveform analyzer to check the frequency

response of a video system. One scan line of the image, as it would appear on a waveform

analyzer, is shown at the top of the next page . High frequency roll-off (loss) would show

up as a decrease in the peak-to-peak swings on the right side of the waveform. Low

frequency roll-off would show up as a decrease in the peak-to-peak swings on the left side

of the waveform.

Some waveform analyzers can be set to detect and display the amplitude of the peaks. A

typical amplitude waveform for a good system is shown at the bottom of the next page.

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