Tektronix TDS 420A, Service Manual, Page: 80 / 288

Brief Procedures
4- 12
TDS 420A, TDS 430A & TDS 460A Service Manual
H
Press the main-menu button Bandwidth ; then press the side-menu
button 20 MHz .
H
Press TRIGGER MENU .
H
Press the main-menu button Mode & Holdoff .
H
Press the side-menu button Normal .
H
Press CLEAR MENU to remove the menus from the screen.
2.
Verify that the main trigger system operates: Confirm that the following
statements are true.
H
The trigger-level readout for the main trigger system changes when
you rotate the trigger
MAIN LEVEL
knob.
H
The trigger-level knob can trigger and untrigger the square-wave
signal as you rotate it. (Leave the signal
un
triggered.)
H
Pressing SET LEVEL TO 50% triggers the signal that you just left
untriggered. (Leave the signal triggered.)
3.
Verify that the delayed trigger system operates:
a.
Select the delayed time base:
H
Press
HORIZONTAL MENU
.
H
Press the main-menu button Time Base .
H
Press the side-menu button Delayed Triggerable ; then press the
side-menu button Delayed Only .
H
Set the horizontal
SCALE
for the
D
(delayed) time base to 200 s.
b. Select the delayed trigger-level menu:
H
Press SHIFT ; then press DELAYED TRIG .
H
Press the main-menu button Level ; then press the side-menu
button Level .
c. Confirm that the following statements are tru e:
H
The trigger-level readout for the delayed trigger system changes
when you rotate the general purpose knob.
H
The general purpose knob can trigger and untrigger the square-wave
probe-compensation signal as you rotate it. (Leave the
signal
un triggered.)