Keysight Technologies InfiniiVision 3000 X Series, User Manual

Page: 143 / 432

Triggers
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Keysight InfiniiVision 3000 X-Series Oscilloscopes User's Guide 143
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.
T
NOTE
You can also change the trigger level of all channels by pressing [Analyze] > Features and
then selecting Trigger Levels .