3 Spectrum Analyzer Mode
3.9 SEM Measurement
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 1560 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 1558 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
Unit Example Notes
dBm :UNIT:POW DBM Y Axis Unit is set to dBm
dBmV :UNIT:POW
DBMV
Y Axis Unit is set to dBmV
dBmA :UNIT:POW
DBMA
Y Axis Unit is set to dBmA
W :UNIT:POW W Y Axis Unit is set to W
V :UNIT:POW V Y Axis Unit is set to V
A :UNIT:POW A Y Axis Unit is set to A
dBmV :UNIT:POW Y Axis Unit is set to dBmV
Spectrum Analyzer Mode User's &Programmer's Reference 1557
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