JVC TK-1280E - Page 14

@ BLC (Back Light Compensation) switch
This function makes the iris focus on an object to be shot
and is located near the center position of the screen.
Brightness area
Set this switch to “ON” at the time of back-light.
ON (upper side): Back-light compensation is activated.
The iris will be opened when the circum-
ference is lighter than the center of the
screen.
The iris will be closed when the circumfer-
ence is darker than the center of the
screen.
OFF (lower side): Back-light compensation is not activated.
Notes:
e This function is activated when the camera SHUTTER
mode select switch is set to AUTO position and when
using the galvanometric auto-iris lens or the video-
level-sensing auto-iris lens.
® This function is not effective when the difference of the
brightness of the center of the screen and its circumfer-
ence is smail.
@ AGC (Automatic Gain Control) switch
This automatically increases the camera’s sensitivity when
the level of ambient light drops.
ON (upper side): AGC is activated.
OFF (lower side): AGC is not activated.
12
© V phase adjustment
If the camera is to be used in the line-iock sync mode, the
vertical phase may require adjustment to synchronize the
vertical phase of the camera with other camera in the sys-
tem. (Vertical phase is adjustable over the range of +90°.)
Make this adjustment when the vertical phase of the
camera does not match with other cameras (or systems).
For correct adjustment, use a multichannel! oscilloscope.
This vertical phase adjustment can only be made when the
camera is operating in the line-lock sync mode
Notes:
@ When AC power line frequency is of 60 Hz, the line-lock
sync operation is not possible.
@ This adjustment is necessary only when the fine-lock
sync operation is. performed.
Ou phase adjustment
For adjusting the horizontal phase when gen-lock (or H/V
lock) operation is performed. Adjust with reference to other
camera(s) in the system.
Notes:
@ Gen-lock (or H/V lock) operation may become unstable
using a signal containing severe jitter (vertical or hori-
zontal picture vibrations) such as a video recorder play-
back signal.
e@ This adjustment is not necessary unless gen-lock (or
H/V lock) operations are performed.
@ Sync mode switch
The internal/external sync mode (automatic) or line-lock
sync mode (or H/V lock mode) is availabie with the TK-
1180E. Set the sync mode switch correctly.
LL position:
in the line-lock setting, the camera’s vertical synchroniza-
tion can be driven by the 50 Hz AC signal in the power
lines. To select power lines phase-locked sync, set the
switch to the LL position.
Furthermore, when an external H/V sync signal is input, the
camera automaticaily switches to the H/V lock mode.
Notes:
e Do not supply an external sync reference signal when
using the camera in line-lock mode.
@ In the fine-lock sync mode, synchronization may not be
correct for a few seconds after the power is turned on;
this is not a malfunction.
Line-lock sync operation is possible only when used
with an AC power source (AC 24V, 50 Hz)
1/E (internal/external) position:
Select internal/external sync by setting the sync mode
switch to the VE position. with this setting, when the exter-
nal sync reference signal is input, the camera switches to
the external sync mode, and when no signal is input, the
camera switches to the internal sync mode automatically.
@ SC phase fine adjustment control
@ SC phase coarse adjustment switch
For adjusting the colour sub-carrier phase when gen-lock
operation is performed. Adjust by changing the setting of
the SC phase coarse adjustment switch (A/B) in conjunc-
tion with the SC phase fine adjustment control with refer-
ence to other camera(s) in the system.
Notes:
e Gen-lock operation may become unstable using a sig-
nal containing severe jitter (vertical or horizontal picture
vibrations) such as a video recorder playback signal.
@ This adjustment is not necessary unless gen-lock oper-
ations are performed.