Teledyne 980 DP1.4, Руководство пользователя, Страница: 480 / 507

980 DP 1.4 Video Generator / Analyzer - User Guide Rev. A1
Page 480 June 16, 2017
16.160.7 Method
All the mid-level 2 on - 2 off stripes in all the resolution patches should be visible and distinct. This is a sensitive
test for nois
e in the display’s video amplifiers.
16.160.8 Test
Quick gamma check.
16.160.9 Method
The average brightness level of the small gamma dither box should match the brightness of the larger surrounding
box. This is a visual check to see if the display
’s gamma correction is producing the correct mid-level response.
16.160.10 Test
Video gain linearity and gamma.
16.160.11 Method
The individual grayscale boxes all should be at their indicated levels. A small aperture photometer is usually
required to get accurate and repeatable readings.
16.160.12 Test
Contrast and brightness check.
16.160.13 Method
On a display with properly adjusted brightness and contrast controls, both the 5% and
95% contrast boxes should be clearly visible inside their larger surrounding 0% and 100% boxes.
16.160.14 Test
Video amplifier stability.
16.160.15 Method
The two black-and-white windows should show sharp transitions between the smaller box and the surrounding
window. Streaking may be an indication of undershoot or overshoot while ghost images may indicate a ringing
problem.
16.160.16 Test
Excessive overscan and off-center alignment
16.160.17 Method
The entire border should be clearly visible on the face of the tube and not be hidden by the edge of the glass or by
any bezel.