Application Examples
Triggering on
a Video Signal
You are testing the video c ircuit 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 tri
gger 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 reflections, 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 y ou use the Autoset function.
1. Push the Odd Field or Even Field option buttons from the Autoset Menu
to sync on odd or even fields 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:
TBS1000B and TBS1000B-EDU Series Oscilloscopes User Manual 41
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