User manual

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Horizontal System
position and setting it to the center of the screen using
the position knob, you can set an additional marker. This
procedure allows you to mark up to 8 interesting positions
within the signal. You can toggle between markers by
pressing the arrow keys
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. These keys also allow you
to center the markers in the middle of the screen. This
feature enables you to quickly compare marked signal
sections in ZOOM mode. To delete a marker, center it in
the middle of the screen and press the SET/CLR key once
again. You can also delete all time markers simultaneously
in the marker soft menu. With the soft menu key TRIGGER
TIME TO ZERO the triger time can be set to 0 s. Additi-
onally,CLEARALLMARKERremovesalldenedtime
stamp markers.
6 Trigger System
Four keys are available to se-
lect one of the frequently used
trigger settings:
❙ TYPE: Selection of trigger
type Edge, Puls, Logic, Video
and Hold off time
❙ SLOPE: Type of slope
❙ SOURCE: Determines the
trigger source
❙ FILTER: Determines the exact
trigger conditions
Additional keys are available
to select the trigger mo-
des (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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activate this mode. This key is
highlighted in white when the SINGLE mode is activated.
The R&S®HMO1002 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activa-
ted, data is stored and the oscilloscope switches to STOP
mode (the RUN/STOP key is permanently highlighted in
red).
6.2 Trigger Source
The two analog channels are available as trigger sources
(SOURCE key). If the optional extension with active logic
probes HO3508 including 8 digital inputs is connected, up
to 8 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.
Fig. 6.1: Control panel
for the trigger system
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C
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