Tektronix TDS1000- Uživatelský manuál stáhnout pdf (Strana 81)

Application Examples

TDS1000/2000-Series Digital Oscilloscope User Manual

NOTE. Most video systems use 75 ohm cabling. The oscilloscope

inputs do not properly terminate low i mpe dance cabling. To avoid

amplitude inaccuracy f rom 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 t he vi deo fields, follow these steps:

1. Push the AUTOSET button. When Autoset is complete, the

oscilloscope displays the video signal with 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 ste ps, but may be

necessary depending on t he video signal. To use the method, follow

these steps:

1. Push the TRIG MENU button to see the Trigge r Menu.

2. Push the top option button and select Video.

3. Push the Source option button and select CH1.

4. Push the Sync option button and select All Fields, Odd Field,or

Even Field.

5. Push the Standard option button and select NTSC.

6. Turn the horizontal SEC/DIV knob to see a complete field across

the screen.

7. Turn the vertical VOLTS/DIV knob to ensure that t he e ntire

video signal is visible on the screen.

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Tektronix TDS1000- Uživatelský manuál Strana 81