Agilent Technologies 2000 X, Руководство пользователя

Страница: 115 / 296

Triggers
9
Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide 115
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
N O T E
You can also change the trigger level of all channels by pressing [Analyze] > Features and
then selecting Trigger Levels.