1-29-1. VLF adjustment [PWB-MAIN]
Note:
The VLF adjustment requires the precise measuring conditions. Make
sure the adjustment is carried out in the following environment.
2.
1.
3.
4.
All metal parts should be attached to the monitor.
All the electrical equipment used for the adjustment including the
monitor should be grounded to the same outlet.
Set the monitor and the electric field meter with tilt of zero degree at
a distance of 29.5±0.5cm so that the CRT face will be parallel to the
electric field meter.
No other monitors should be placed in the area with a radius of 1.5m
behind the center of monitor, between the monitor and the electric
field meter and 1.0m behind the electric field meter.
Keep at least 20cm between the monitors.
The VLF level of background should be 0.3V/m or less when the
monitor power cable is disconnected.
Monitor
1.5m
29.5+0.5cm
Electric field meter
20cm
1.0m
Monitor
1-29. TCO requirement
- 12 -
5.
Receive a H-character inverted signal of MODE 6.
Adjust the contrast so that the brightness at screen center is 60±5cd/m
2
.
Set the brightness to center indication.
Turn VR5T2 (VLF-2) fully counterclockwise.
Adjust VR5T1 (VLF-1) so that the electric field meter reads the VLF level
0.95V/m or less.
In case that the VLF level is not within the specified range above, adjust
VR5T2.
In case that the VLF level is still not within the specified range above, turn
VR5T2 fully clockwise and adjust VR5T1.
In case that the VLF level is still not within the specified range above,
adjust VR5T2.
1)
2)
3)
4)
5)
6)
7)
8)
VLF level
VR5T1 VLF-1
VR5T2 VLF-2
6.
