Quantum-data 801GC Manuel d'utilisateur Page 104

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4-66 Chapter 4: Built-In Images
Model 801GC, 801GF & 801GX¥Rev. X1
Stairs20
Description The active video area goes from full black at the
left edge of the screen to full white at the right
edge. There are six (6) steps. The step levels are
7.5 (black), 20, 40, 60, 80 and 100 IRE.
Test Video gain linearity
Method When viewed on a monitor’s screen, a black bar
plus five (5) gray bars should be visible. There
should be no color shifts and each of the bars
should be uniform in color.
The image also can be used with an oscilloscope
or TV waveform analyzer to check the gain linearity
and gamma correction of a video system.
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