User manual

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Trigger System
to navigate the events in STOP mode. SET allows you to
center the selected event. When the zoom function is acti-
vated, the selected event will automatically be centered in
the zoom window.
Fig. 5.7: Search mode with event list
6 Trigger System
The trigger system of the
R&S®HMO3000 series is easy
to handle by just observing the
concept of instrument operation.
There are 4 keys destined for fre-
quently used functions:
❙ TYPE: selection of trigger type
EDGE (EDGE A/B), PULSE,
LOGIC, VIDEO and HOLD OFF
❙ SLOPE: type of slope
❙ SOURCE: determines the
triggers source
❙ FILTER: determines the exact
trigger conditions
Additional keys are available to
select the trigger modes (AUTO, NORMAL and SINGLE).
6.1 Trigger Modes Auto, Normal and Single
The AUTO/NORM
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key allows you to toggle directly
between the basic trigger modes. If Auto mode is activa-
ted, the key is not illuminated. Pressing the key will acti-
vate NORMAL mode, and a red LED will highlight the
key. In AUTO mode, the screen always displays a signal.
Ifasignalfulllsthetrigger conditions, the oscilloscope
will synchronize with this event and triggers when the set
conditionismet.Incaseofasignalthatdoesnotfulllthe
trigger condition (a simple case would be direct current),
the oscilloscope itself will generate a trigger event. This
allows a glance at the input signals at any time, regardless
of the trigger condition. In NORMAL mode, the signal will
now be captured and displayed if the trigger condition is
met.Incasenonewsignalfulllsthesettriggercondition,
the signal that was triggered last will be displayed. To
ensure that only a signal that meets the trigger condition
is detected and displayed, press the Single key to
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acti-
vate this mode. This key is highlighted in white when the
SINGLE mode is activated. The R&S®HMO3000 series
detection and trigger system is now activated, indicated
by a blinking RUN/STOP key
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. If the trigger condition is
fullled,thetriggersystemisactivated,dataisstoredand
the oscilloscope switches to STOP mode (the RUN/STOP
key is permanently highlighted in red).
6.2 Trigger Sources
The two / four analog channels and the external trigger
input are available as trigger sources (SOURCE key). If the
optional extension with active logic probes R&S®HO3508
including 8 digital inputs is connected, up to 8 resp. 16
digital inputs are available as trigger source. The soft menu
key AC LINE enables you to trigger the trigger at system
frequency. The trigger signal is extracted internally from
the power supply.
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C
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Fig. 6.1: Control panel
for the trigger system