Maintaining The Grayscale Chart - Sony Digital Betacam DVW-707 Maintenance Manual

7-1-4. Maintaining the Grayscale Chart

For the VA 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
Phone:
Fax:
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.
DVW-790WS/709WS/707
DVW-790WSP/709WSP/707P P2V1
Postcode 104-0054
81-3-3532-3011
81-3-3532-2056
7-1. General Information for Electrical Adjustment
7-3