uispiaying signals
4?
Triggering on Signals
Triggering is an important function of the osciiioscope that allows you to
stabilize the display of a signal. The trigger circuit of the osciiioscope syn
chronizes the beginning of a sweep (or acquisition) with a particular point on
the rising or falling edge of a trigger signal. Without a proper trigger, the
signal display may either “free-run” or not appear at all.
Triggering on Repetitive Signals
Repetitive signals, such as a fixed-frequency sine wave (Figure 3-24), can
supply their own trigger signal to synchronize the display. The P-P AUTO
mode is the easiest mode to use for repetitive signals because it automati
cally adjusts the range of the trigger-level control and generates a sweep
when no trigger signal is present.
f~1 Step 1: Apply the repetitive signal to the Channel 1 input connector.
I"! Step 2: Set trigger mode to P-P AUTO.
P I Step 3: Set the vertical mode to Channel 1 and the trigger SOURCE to
VERT MODE. (The trigger signal is obtained from the signal applied to
the selected channel; in this case, Channel 1.)
["I Step 4: Set the COUPL switch to NORM.
[~1 Step 5: Adjust the TRIGGER LEVEL, if necessary, to stabilize the
display,
□ SteP 6; Adjust the vertical and horizontal controls to display a few
cycles of the waveform.
Figure 3-24: Repetitive Sine Wave
2221A User Manual
3-25
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