GRASS VALLEY KARRERA, Installation & Service Manual

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Basic Configuration
252
About Switcher System Timing
range to be properly timed at the output. The calculation of the actual video delay of a
specific input is the Nominal Switcher Delay minus the input time location within the
autotiming window (the time location value can be zero, positive, or negative).
Typically, there are two methods for timing the switcher system and sources: either the
sources are at zero timing and the switcher is delayed or the switcher system timing is at
zero and the sources are back-timed. Regardless of the method, all video signals must be
received earlier than the SST and the source input timing must be within a specific timing
window for an input signal to be timed correctly. The Timing menu provides the
information and controls needed to insure the input timing is within the timing window.
Timing Analyzer
Use the Eng Setup, Video Settings, Timing menu when timing the system.
This analyzer reports the timing position of a selected source relative to the internal sync
generator. The source is selected with the upper right Analyzer Source soft knob and data
pad. The relative position of that source is reported in lines and µs. Positive values indicate
the source is later in time than the internal sync generator, and negative values indicate the
source is earlier.
GV K-Frame XP systems have an autotiming window, in the Video Settings, Timing tab.
Sources that fall within that window will be properly timed throughout the system, even if
the signal is cascaded through multiple M/Es.
The Switcher Horizontal and Switcher Vertical soft knobs adjust the timing of the system
relative to the incoming reference. These values are generally best left at zero.