Application Examples
Triggering on a Video Signal
You are testing the video circuit in a piece of medical equipment and need to
display the video output signal. The video output is an NTSC standard signal. Use
the video trigger to obtain a stable display.
NOTE.
Most video systems use 75 ohm cabling. The oscilloscope inputs do not
properly terminate low impedance cabling. To avoid amplitude inaccuracy
from improper loading and re
fl
ections, place a 75 ohm feedthrough terminator
(Tektronix part number 011-0055-02 or equivalent) between the 75 ohm coaxial
cable from the signal source and the oscilloscope BNC input.
Triggering on Video Fields
Automatic.
To trigger on the video
fi
elds, follow these steps:
1.
Push the
Autoset
button. When Autoset is complete, the oscilloscope displays
the video signal with sync on
All Fields
.
The oscilloscope sets the Standard option when you use the Autoset function.
1.
Push the
Odd Field
or
Even Field
option buttons from the
Autoset
Menu
to sync on odd or even
fi
elds only.
Manual.
An alternative method requires more steps, but may be necessary
depending on the video signal. To use the manual method, follow these steps:
w w w . e k t
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