Brief Procedures
TDS 420A, TDS 430A & TDS 460A Service Manual
4-11
H Press VERTICAL MENU.
H Press the main-menu button Bandwidth. Then press the side-menu
button 20 MHz.
H Press CLEAR MENU to remove the vertical menu from the screen.
2. Verify that the time base operates: Confirm the following statements.
a. One period of the square-wave probe-compensation signal is about five
horizontal divisions on-screen for the 200 s horizontal scale setting (set
in step 1c).
b. Rotating the horizontal SCALE knob clockwise expands the waveform
on-screen (more horizontal divisions per waveform period), counter-
clockwise rotation contracts it, and returning the horizontal scale to
200 s returns the period to about five divisions.
c. The horizontal POSITION knob positions the signal left and right on
screen when rotated.
3. Remove the test hookup: Disconnect the probe from the channel input and
the probe-adjust terminal.
Equipment
Required
One P6138A probe
Prerequisites None
1. Install the test hookup and preset the oscilloscope controls:
a. Hook up the signal source: Install the probe on CH 1. Connect the probe
tip to PROBE ADJ on the front panel; leave the probe ground uncon-
nected. (See Figure 4--3 on page 4--8.)
b. Initialize the oscilloscope:
H Press save/recall SETUP.
H Press the main-menu button Recall Factory Setup.
H Press the side-menu button OK Confirm Factory Init.
c. Modify default settings:
H Press AUTOSET to obtain a viewable, triggered display.
H Set the horizontal SCALE for the M (main) time base to 200 s.
H Press VERTICAL MENU.
Verify the Main and
Delayed Trigger Systems
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