3 Spectrum Analyzer Mode
3.4 Occupied BW Measurement
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 726 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
set to Lin and you set Y Axis Unit to V, pressing Display Scale (Lin) sets the Y Axis
Unit to V. Pressing Display Scale (Log) again sets the Y Axis Unit back to dBm.
If an Amplitude Correction is being applied that has an associated Transducer Unit,
all selections but Xducer Unit are grayed-out. For more information, see
"Transducer Unit" on page 727 below.
Remote Command
:UNIT:POWer DBM | DBMV | DBMA | V | W | A | DBUV | DBUA | DBPW | DBUVM |
DBUAM | DBPT | DBG
:UNIT:POWer?
Example
:UNIT:POW dBmV
:UNIT:POW?
See also "Remote Interface Examples" on page 725 below
Notes The Y axis unit has either logarithmic or linear characteristics. The set of units that is logarithmic
consists of dBm, dBmV, dBmA, dBmV, dBmA, dBmV/m, dBmA/m, dBpT, and dBG. The set of units that
are linear consists of V, W, and A. The chosen unit will determine how the reference level and all the
amplitude-related outputs like trace data, marker data, etc., read out
Dependencies Appears only in Spectrum Analyzer Mode
If an amplitude correction with a Transducer Unit other than None is applied and enabled:
–
The Transducer Unit selection is forced, and is the only Y Axis Unit available. The specific
Transducer Unit is shown in square brackets in the dropdown, and all other Y Axis Unit choices are
grayed-out
–
If you turn off that correction or set Apply Corrections to NO, the Y Axis Unit that existed before
the Transducer Unit was applied is restored
When Normalize is ON (in the Trace, Normalize menu), Y Axis Unit is grayed-out, and forced to dBm
Couplings The instrument retains the entered Y Axis Unit separately for both Log and Lin amplitude Display
Scales
Preset dBm for log scale, V for linear. The true ‘preset’ value is dBm, since at preset the Y Display Scale is set
to logarithmic
State Saved Saved in instrument state
Annotation The Y Axis Unit is shown after Ref Level value at the top of the graticule
724 Spectrum Analyzer Mode User's &Programmer's Reference
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