Akai LCT3785TAJ Service Manual page 98

Measurement Condition:
After lighting on the panel 30 mins, you can proceed the Measurement testing.
The definiton of Typ value is under status of lamp current as V
minutes
Definition of these measurement items is as follows:
[Note1] Definition of Contrast Ratio:
［ These items are measured using BM-5A (TOPCON) under the dark room condition (no ambient
light). ］
CR= ON (White) Luminance / OFF (Black) Luminance
[Note 2] Definition of Luminance, Luminance uniformity, Contrast and the Deviation of Color
Coordinate:
Luminance and Contrast: To measure at the center position "5" on the screen (NO.5),
Luminance uniformity: Lw (MAX) and Lw(MIN) are the maximum and minimum
The Deviation of Color Coordinate: To measure at the position "1~9" on the screen
(1, 1)
128
384
640
see Fig.8-1 below.
luminance value measure at the position "1~5" on the screen
(NO.1~5), see Fig.8-1 and below show equation:
ΔLw ＝ [ (Lw(MIN)) / Lw(MAX) ] × 100%
(NO.1~9), see Fig.8-1 below.
228 683
1
7
3
Figure 8-1. Measurement positions
96／126
= 5V after power on for 30
DIM
1138
6 2
8
5
4
9
(1366, 768)