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 untriggered.)
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 îs.
b. Select the delayed trigger-level menu:
H Press SHIFT;thenpressDELAYED TRIG.
H Press the main-menu button Level; then press the side-menu
button Level.
c. Confirm that the following statements are true:
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 untriggered.)
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