Triggers 10
Agilent InfiniiVision 3000 X-Series Oscilloscopes User's Guide 143
Adjusting the Trigger Level
You can adjust the trigger level for a selected analog channel by turning
the Trigger Level knob.
You can push the Trigger Level knob to set the level to the waveform's
50% value. If AC coupling is used, pushing the Trigger Level knob sets the
trigger level to about 0 V.
The position of the trigger level for the analog channel is indicated by the
trigger level icon (if the analog channel is on) at the far left side of the
display. The value of the analog channel trigger level is displayed in the
upper- right corner of the display.
The trigger level for a selected digital channel is set using the threshold
menu in the Digital Channel Menu. Press the [Digital] key on the front
panel, then press the Thresholds softkey to set the threshold level (TTL,
CMOS, ECL, or user defined) for the selected digital channel group. The
threshold value is displayed in the upper- right corner of the display.
The line trigger level is not adjustable. This trigger is synchronized with
the power line supplied to the oscilloscope.
Forcing a Trigger
The [Force Trigger] key causes a trigger (on anything) and displays the
acquisition.
This key is useful in the Normal trigger mode where acquisitions are made
only when the trigger condition is met. In this mode, if no triggers are
occurring (that is, the "Trig'd?" indicator is displayed), you can press [Force
Trigger] to force a trigger and see what the input signals look like.
In the Auto trigger mode, when the trigger condition is not met, triggers
are forced and the "Auto?" indicator is displayed.
You can also change the trigger level of all channels by pressing [Analyze] > Features and
then selecting Trigger Levels.
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