3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
In log scale, the Scale/Div is shown in the upper left side of the display. In Lin mode, no annotation is
displayed
Display Scale
Selects a linear or logarithmic vertical scale for the display and for remote data
readout:
LOGarithmic
The vertical graticule divisions are scaled in logarithmic units. The top line of
the graticule is the Reference Level, and the Scale/Div value is used to assign
values to the other locations on the graticule
LINear
The vertical graticule divisions are linearly scaled with the reference level value
at the top of the display and zero volts at the bottom. Each vertical division of
the graticule represents one-tenth of the Reference Level
NOTE
The Y Axis Unit used for each type of display is set by pressing Y Axis Unit. The
instrument retains separate Y Axis Unit settings for both Log and Lin.
Remote Command
:DISPlay:WINDow[1]:TRACe:Y[:SCALe]:SPACing LINear | LOGarithmic
:DISPlay:WINDow[1]:TRACe:Y[:SCALe]:SPACing?
Example
:DISP:WIND:TRAC:Y:SPAC LOG
:DISP:WIND:TRAC:Y:SPAC?
Dependencies If "Normalize" on page 540 is ON, Display Scale is forced to LOG and is grayed-out
Couplings Changing Display Scale always sets Y Axis Unit to the last unit specified for the current amplitude
scale
Preset
LOG
State Saved Saved in instrument state
Annotation Log or Lin appears to the left of the graticule below the reference level
Y Axis Unit
Displays a dropdown menu that enables you to change the vertical (Y) axis
amplitude unit. This setting affects how the data is read over the remote interface.
When using the remote interface, only numerical values are returned, so you must
know what the Y Axis Unit is to interpret the results. This is described in more detail
in "Amplitude Data Query and Y Axis Unit" on page 208 below.
For measurements that support both Log and Lin scales, the instrument retains the
entered Y Axis Unit separately for both Log and Lin amplitude Display Scales. For
example, if Display Scale has been set to Log, and you set Y Axis Unit to dBm,
pressing Display Scale (Log) sets the Y Axis Unit to dBm. If Display Scale has been
Spectrum Analyzer Mode User's &Programmer's Reference 205