Technicolor - Thomson STUDIO CAMERA LDK 20(S) - Manual (Page 61)

Adjustments Technical Manual LDK 20(S) - Studio Camera 4-35
Video Miscellaneous Board
Auto iris
1. Point camera at and fill frame with a white 90% reflecting test chart, illuminated with a 3200K spotlight. Set
iris to F5.6.
Measure at: Adjust with: Required result:
CVBS out Waveform monitor
100% video level.
2. On OCP, ensure that the IRIS CENTRE control is turned fully counterclockwise and the IRIS RANGE control
is turned fully clockwise. Move iris control first fully up and then fully down. Then set iris control to its mid-
position.
3. On OCP, switch AUTO IRIS to AUTO.
4. Observe waveform monitor and adjust auto iris level on camera control panel for 70% white with setpoint
potentiometer.
Measure at: Adjust with: Required result:
CVBS out Setpoint 70% white
pos. = 42 (490mV)
5. On OCP, set COLOUR TEMP. switch to position AW1.
6. Press AW button once so that the AW window is visible in the viewfinder and on the PXM monitor.
7. Press the AW button a second time to start the automatic white process.
8. During the automatic white process observe the waveform monitor. The mom. iris should be 70% white.
Measure at: Adjust with: Required result:
CVBS out 70% white
(490mV)
9. Point camera at gamma test chart illuminated with a 3200K spotlight.
10. Observe waveform monitor and with the peak/average value set to 50 on the camera control panel, adjust
the peak/average potentiometer on the miscellaneous board for 90% white.
Measure at: Adjust with: Required result:
CVBS out ZR187 90% white
(630mV)