3 Spectrum Analyzer Mode
3.4 Occupied BW Measurement
The control is duplicated here to allow you to conveniently perform a peak search
and change the marker’s control mode to Delta without having to access two
separate menus.
3.4.7.4 Properties
The controls on this tab are used to set certain properties of the selected marker.
Marker Frequency
This is the fundamental control that you use to move a marker around on the trace.
It is the same as "Marker Frequency" on page 793 on the Settings tab.
Relative To
Selects the marker to which the selected marker is relative (its reference marker).
Every marker has another marker to which it is relative. This marker is referred to as
the “reference marker” for that marker. This attribute is set by the Marker,
Properties, Relative To key. The marker must be a Delta marker to make this
attribute relevant. If it is a Delta marker, the reference marker determines how the
marker is controlled and how its value is displayed. A marker cannot be relative to
itself.
Remote
Command
:CALCulate:OBWidth:MARKer[1]|2|…|12:REFerence <integer>
:CALCulate:OBWidth:MARKer[1]|2|…|12:REFerence?
Example
:CALC:OBW:MARK:REF 2
:CALC:OBW:MARK:REF?
Notes Causes the marker specified with the subopcode to become selected
Range (for SCPI command): 1 to 12. If the range is exceeded, the value is clipped
A marker cannot be relative to itself so that choice is not available, and if sent from SCPI generates
error -221: “Settings conflict; marker cannot be relative to itself”
The query returns a single value (the specified marker number’s relative marker)
Couplings The act of specifying the selected marker’s reference marker makes the selected marker a Delta
marker
If the reference marker is Off, it is turned on in Normal mode at the Delta marker location
Preset The preset default “Relative To” marker (reference marker) is the next higher numbered marker (current
marker +1). For example, if marker 2 is selected, then it’s default reference marker is marker 3. The
exception is marker 12, which has a default reference of marker 1
Set to the defaults by using Restore Mode Defaults. This is not reset by Marker Off, All Markers Off, or
Preset
State Saved Saved in instrument state. Not affected by Marker Off and hence not affected by Preset or power cycle
Spectrum Analyzer Mode User's &Programmer's Reference 797
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