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.

4-66

Chapter 4: Built-In Images

Model 801GC, 801GF & 801GX¥Rev. X1

Page 104
Image 104
Quantum Data 801GC, 801GF, 801GX manual Stairs20