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980 DP 1.4 Video Generator / Analyzer - User Guide
Rev. A1
Select the inverted version and perform the Brightness Control Adjustment test on the center box. Then, center the
light meter probe in each of the corner squares and note the reading you get for each square. The deviation
between each of the corner readings and the center reading should be within your specification limits.
16.22 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.
16.22.1Test
Frequency response.
16.22.2Method
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.
Page 330
June 16, 2017
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