Application Examples
TDS1000/2000-Series Digital Oscilloscope User Manual 63
NOTE. Most video systemsuse 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
sourceand the oscilloscope BNC input.
Triggering on Video Fields
Automatic. To trigger on the video fields, follow these steps:
1. Push the AUTOSET button. When Autoset is comple te, the
oscilloscope displays the video signalwith sync on All Fields.
2. 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 method, follow
these steps:
1. Push the TRIG MENU button to see the Trigger Menu.
2. Push the top optionbutton and select Vi deo.
3. Push the Source option button and select CH1.
4. Push the Sync option button and select All Fields,OddField,or
Even Field.
5. Push the Standard option button and select NTSC.
6. Turn the horizontal SEC/DIV knob to see a c omplete field across
the screen.
7. Turn the vertical VOLTS/DIV knob to ensure that t he entire
video signal is visible on the screen.