Keysight Technologies DSO-X 2002A, Руководство пользователя, Страница: 127 / 352

Triggers
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Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide 127
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.
Edge Trigger
The Edge trigger type identifies a trigger by looking for a specified edge (slope)
and voltage level on a waveform. You can define the trigger source and slope in
this menu. The trigger type, source, and level (if applicable) are displayed in the
upper-right corner of the display.
1 On the front panel, in the Trigger section, press the [Trigger] key.
2 In the Trigger Menu, press the Trigger softkey, and use the Entry knob to select
Edge .
3 Select the trigger source:
• Analog channel, 1 to the number of channels
NOTE
You can also change the trigger level of all channels by pressing [Analyze] > Features and
then selecting Trigger Levels .