Agilent Technologies Signal Analyzer N9030a - Manual (Page 730)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
Marker Function
More Information
The units to be used for displaying Marker Function results in Delta mode vary depending on
what is the reference marker and what it is referenced to.
Marker Functions are different from Measurements, which automatically perform complex
sequences of setup, data acquisition, and display operations in order to measure specified signal
characteristics. Marker Functions are specified for each individual marker and may be turned on
individually for each marker.
The Marker Fctn menu controls which marker functions are turned on and allows you to adjust
setup parameters for each function. The Marker Functions are Marker Noise, Band/Interval Power,
and Band/Interval Density, only one of which can be on for a given marker.
If the selected marker is off, pressing Marker Fctn sets it to Normal and places it at the center of
the display on the trace determined by the Marker Trace rules. However, if the selected marker
was Off, Marker Function Off had to be the selected function, and it remains so even after the marker
is thus turned on, although you may then change it.
Fixed marker functions
In the case of a fixed marker, it is not possible to turn on or change a band function. This is
because a Fixed marker holds the value it had when it became fixed; the trace it was on may keep
on changing, so the function value, which depends on trace data, could not be calculated on an
ongoing basis.
It is possible to have a Marker Function on for a Fixed marker, in the case where a function was
already on when the marker became Fixed. In this case the function value will be retained in the
marker. It is also possible to have a Marker Function on for a Fixed marker in the case when the
marker was off and was turned on as Fixed because Delta was pressed to create a reference marker
- in which case the marker function, marker function width, Y Axis value and marker function
result that the Delta marker had when Delta was pressed are copied into the Fixed marker. If Delta
is pressed again, causing the fixed reference marker to move to the delta marker’s position, the
marker function, marker function width, Y Axis value and marker function result that the Delta
marker had when Delta was pressed are again copied into the fixed reference marker.
If a Marker Function is on for a Fixed marker, the marker’s reported value is derived by the
function. Therefore you cannot directly set the X or Y value of a Fixed marker which has a marker
function turned on. Indirect setting as detailed above or when a Peak Search is performed is
allowed, as the Fixed marker is always placed on a trace and can derive its function value from
the trace at the moment when it is placed.
Interval Markers
What is an interval marker? The band power marker computes the total power within a span in a
nonzero span. The results computation must include the RBW. The interval power marker
730 Remote Language Compatibility Measurement Application Reference