Application Examples
NOTE. Most v
ideo systems u se 75 ohm cabling. The oscilloscope inputs do not
properly terminate low impedance cabling. To avoid amplitude inaccuracy
from improper loading a nd 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.
Trigger
ingonVideoFields
Automat
ic. To trigger on the video fields, follow these steps:
1. Push the AutoSet button. When Autoset is complete, the oscilloscope
displa
ys 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 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:
1. Push the 1 (channel 1 menu) button.
2. Pus
h Coupling ► AC.
3. Push the Trig Menu button to see the Trigger Menu.
4. Push the top option button and select Video.
5. Push Source ► CH1.
6. Push the Sync option button and select All Fields, Odd Field,orEven Field.
7. Push Standard ► NTSC.
8. Turn the Horizontal Scale (seconds/division) knob to see a complete field
across the scree n.
9. Turn the Verti cal Scal e (volts/division) knob to ensure that the entire video
signal is visible on the screen.
46 TDS2000C and TDS1000C-EDU Series Oscilloscope User Manual