GRASS VALLEY LDK 4000 ELITE -, Руководство пользователя

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60 LDK 8000 Elite/4000 Elite System camera User’s Guide (v1.01)
Chapter 5 - Video setup
5.3 Test signals
The left-front side panel of the camera has a Color bars switch for switching on a color bar test
signal. The color bar is the standard test signal that is used to set up and check the camera
before use. When the color bar is selected the following functions are temporarily set to
Off :
• Black stretch
• White limiter
• Zebra
• Safe area (VF)
• Cadre (VF)
The lens iris closes automatically when the color bar is switched on.
5.4 Gain
5.4.1 Gain selection
Depending on the available light level it may be necessary to adjust the gain of the camera.
Setting the gain level higher may introduce more noise into the image. The gain is selected via
the
Gain switch on the left-front side of the camera.
1. When this switch is pressed initially, the current gain value is displayed in the viewfinder.
2. Holding the switch in the up or down position for a short moment selects one of the five
master gain settings: -, 0, +, ++ and +++.
– The actual value of the gain in dB is assigned to these symbols in the
INSTALL
menu.
– The Gain indicators in the viewfinder light to indicate the value selected. (The + and
++ indicators light when the gain is +++.)
5.4.2 Variable gain
The gain switch can also be used to vary the gain continuously between its minimum and
maximum value.
1. Hold the switch continuously in the up or down position until you see the value in the
viewfinder change in steps of 0.1 dB.
2. Release the switch when you reached the value you want. This exits the value selection
mode.
3. Using the switch momentarily again sets the gain to the nearest standard value.
Preset Gain
- can be set to -6 or -3 dB
0 is always 0 dB
+ can be set to +3, +6 or +9 dB
++ can be set to +6, +9 or +12 dB
+++ is 12 dB