Tektronix TDS 420 Performance Verification Manual page 52

Performance Tests
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Runt 2.500578 £T Average F
Edge slope |
First, set a signal with an che pl y)
amplitude at the minimum
trigger sensitivity. 0
Second, check for a stable U
trigger at both the positive :
and negative slope settings. (Saal TOOMVE M20.0ns Chis smv. UJ
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' Source | Coupling MR tevel Mode |
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Figure 1-15: Measurement of Trigger Sensitivity
c. Check delayed trigger system for stable triggering at limits: Do the
following subparts in the order listed.
Press HORIZONTAL MENU; then press the main-menu button
Time Base. Now press the side-menu button Delayed Only.
Press SHIFT; then press DELAYED TRIG. Press the main-menu
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 Slope; then use the side menu to switch between trigger
slopes.
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: Press 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, through its leveling head, the signal output of a
high-frequency leveled sine-wave generator to CH 1.
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