997
Marker
More Information
The X-axis scale of a marker is the scale of its X-axis value. This affects the units displayed in the
Marker Result block and used to specify the marker’s X-axis location. The X-axis scale is specified
using the Marker, Properties, X-axis scale key.
All markers in swept spans have both a time and frequency value. Which of these is used for the result
display, and for positioning the marker, depends on the X-axis scale setting. The X-axis scale setting
can be Frequency or Time, as well as the reciprocal of either (Period or Inverse Time). There is also an
Auto setting - when in Auto, a marker’s X-axis scale changes whenever the domain of the trace, upon
which it set, changes. All choices for X-axis scale are allowed.
Auto
When in Auto, the X-Axis Scale is Frequency if the Marker Trace is a frequency domain trace, Time if
the Marker Trace is a time domain trace. When in Auto, if the marker changes traces, or the domain of
the trace the marker is on changes, the auto result is re-evaluated. If the X-axis scale is chosen manually,
that Scale is used regardless of the domain of the trace.
Frequency
Sets the marker X-axis scale to Frequency, displaying the absolute frequency of a normal marker or the
frequency of the delta marker relative to the reference marker. Frequency is the auto setting for
frequency domain traces.
If Frequency is selected for a time domain trace, all of the points in the trace will show the same value.
Attempting to use the knob or step keys to adjust the X-axis value of the marker or entering an X-axis
value from the numeric keypad or remotely will have no effect but will generate no error.
Preset AUTO
Marker Preset (selected when a marker is turned Off): Auto (see below). In
most measurements the Auto settings results in Frequency being the preset
readout.
State Saved Saved in instrument state
Initial S/W Revision Prior to A.02.00
Key Path Marker, Properties, X-axis scale
Example CALC:MARK2:X:READ:AUTO ON sets the marker 2 X-axis scaling to
automatically select the most appropriate units.
Initial S/W Revision Prior to A.02.00
Key Path Marker, Properties, X-axis Scale
Example CALC:MARK2:X:READ FREQ sets the marker 2 X-axis scale to Frequency.
Notes 1-of-N readback is Frequency
State Saved The X-axis scale setting is saved in instrument state.
Initial S/W Revision Prior to A.02.00