Performance Tests
TDS 420A, TDS 430A & TDS 460A Service Manual
4-43
Set a signal with
an amplitude
at the minimum
trigger sensitivity.
Check for a stable
trigger at both the
positive and negative
slope settings.
1
2
Figure 4- 14: Measurement of Trigger Sensitivity
c. Check delayed trigger system for stable triggering at limits: Do the
following subparts in the order listed.
H Press HORIZONTAL MENU; then press the main-menu button
Time Base. Now press the side-menu button Delayed Only.
H Press SHIFT;thenpressDELAYED TRIG. Press the main-menu
button Level.
H Press the side
-menu button SET TO 50%. CHECK that a stable
trigger is obtained for the test waveform for both the positive and
negative slopes of the waveform. (Use the General Purpose knob to
stabilize the trigger if required.) Press the main-menu button Slop e;
then use the side menu to switch between trigger slopes.
H Leave the delayed trigger system triggered on the positive slope of
the waveform before continuing to the next step. Also, return to the
main time base: P ress HORIZONTAL MENU; then press the
main-menu button Time Base. Now press the side-menu button
Main Only.
3. Confirm that the Main and Delayed trigger systems are within sensitivity
limits (at upper frequency limits):
a. Hook up the test-signal source: Disconnect the hookup installed in
step 1. Connect the signal output of a sine wave generator to CH 1.
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