Extron Electronics SVS 100 User Guide - Manual (Page 16)

SVS 100 Installation
Installation, cont’d
2-6
If the genlock connectors are used only for vertical interval switching, no
horizontal or subcarrier phase adjustments are required, and the Burst Lock LED
on the front panel does not light (see Genlock controls and indicators in chapter 3).
Genlock setup
Genlock differs from simple vertical interval switching in that an external device
(a black burst generator) generates a reference sync signal for the system, and
every device that uses that signal has its output signal’s horizontal and
subcarrier phases adjusted to exactly match that of the generator to allow precise
timing and full synchronization. Genlocked systems produce cleaner switches
between inputs than do those without this type of synchronization.
An oscilloscope is required for genlock setup, and a vectorscope is
recommended. Waveform monitors of types other than a vectorscope may give
the appearance that timing is adjusted correctly when it is 180 degrees out of
phase, which will result in incorrect colors or picture artifacts.
To synchronize the SVS 100’s video output with a genlock signal, follow these
steps:
All equipment in the system must be powered up and turned on for at least 15
to 20 minutes before genlock setup adjustments can be made and before the
equipment is used in a genlocked application.
1 . Power up and turn on all the devices that will use the genlock signal.
The devices must be on for at least 15 to 20 minutes before proceeding
with any adjustments.
2 . Connect the active timing source signal to the Genlock In connector on
the rear panel.
3 . Connect the video input signals to the SVS 100, as described previously
in this chapter. The Burst Lock LED lights green to indicate that the SVS
100 is receiving an acceptable genlock (black burst) sync signal via the
Genlock In connector.
4 . Connect the oscilloscope (“scope”) probe A to the Genlock Out connector.
This will provide the scope’s reference signal. In order to avoid altering
the genlock signal, use the cabling configuration that will be used in the
installation. Either connect the genlock signal cable from the scope to the
next device in the system to be timed, or provide 75 ohm termination at
the scope’s genlock output.
5 . Connect scope probe B to the SVS 100’s composite video output
connector.
6 . Using the instructions for the scope you are using, set the scope to view
the signal’s horizontal phases. Press the SVS 100’s Horz Phase button for
2 seconds (see the Operation chapter) and adjust the horizontal phase by
Timing Source
OUT
1 L R
INPUTS OUTPUT
2 L R 3 L R 4 L R 1 L R
RS-232/422
REMOTE
GENLOCK
IN OUT A
B C
OUTPUT
To Scope Probe B
To Scope Probe A
75 ohm Terminator