Performance Tests
TDS 420A, TDS 430A & TDS 460A Service Manual
4-49
Equipment
Required
One NTSC format video generator (Item 18)
One 75 Ω coaxial cable (Item 6)
One 75 Ω terminator (Item 4)
Prerequisites See page 4--15.
1. Install the test hookup and preset the oscilloscope controls:
a. Initialize the oscilloscope:
H Press save/recall SETUP.
H Press the main menu button Recall Factory Setup.
H Press the side menu button OK Con firm Factory In it.
b. Modify the default setup:
H Set the vertical SCALE to 500 mV.
H Set the horizontal SCALE to 20 s.
H Press HORIZONTAL MENU.
H Press the main menu button Record Length.
H Press the side menu button 5000 p oints in 100 divs.
c. Hook up the test-signal source: Connect, through a 75 Ω precision
coaxial cable, followed by a 75 Ω terminator, the output of a NTSC
format video generator to CH 1 (see Figure 4--18).
Digitizing Oscilloscope
Video
Generator
75 Ω
Terminators
Output
Figure 4- 18: Initial Test Hookup
Check Video Trigger
Sensitivity
(Option 05 Equipped
Models Only)
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