Sony BVP-9500WS, Maintenance Manual

Page: 77 / 390

3-5 (E)
BVP-9500WS/9500WSP MM
Light source
Chart
Illuminance meter
3-1-5. Maintaining the Grayscale Chart
For the VA gain adjustment and NR gain adjustment, using an 89.9 %-reflective grayscale chart is
preferable.
If a reflective chart is not available, use a well-maintained pattern box and a transparent grayscale chart
for adjustment.
Before beginning adjustment, set the illumination of the light source (or the luminous intensity on the
chart surface) properly proceeding as follows and set the color temperature to 3200 K exactly by adjust-
ing light.
Information on the reflective grayscale chart
Recommended chart
The reflective grayscale chart is commercially available.
Recommended chart: Reflective grayscale chart (with a special case)
MURAKAMI COLOR RESEARCH LABORATORY GS-3
or equivalent
Supplier: MURAKAMI COLOR RESEARCH LABORATORY
Address: 3-11-3, Kachidoki, Chuo-ku, Tokyo, JAPAN
Postcode 104-0054
Phone: 81-3-3532-3011
Fax: 81-3-3532-2056
Handling precautions
.
Do not touch the chart’s surface.
. Do not subject the surface to dirt, scratches or prolonged exposure to sunlight.
. Protect the chart from excess moisture and harmful gas.
. Avoid resting articles against the case.
.
Open the case and dry the chart more an hour for a month in no use long period.
Replacement period when the chart is used as the reference
The reflective grayscale chart should be replaced every two years if it used as the reference. Because the
chart deteriorates with time and proper adjustment cannot be achieved.
Replacement period varies according to storage conditions of the chart.
Setting illumination (when the reflective chart is used)
Equipment: Illuminance meter (Calibrated)
1. Turn on the light source and warm up for about 30
minutes.
2. Place the illuminance meter on the chart surface.
Adjust the position and angle of the light source so that
the whole surface of the chart is evenly 2000 lx.
n
Light the chart from almost the same direction and
height as the camera to shoot the chart.
3-1. Preparation