Keysight x-series User Reference Manual page 734

10 Monitor Spectrum Measurement
AMPTD Y Scale
Notes
Initial S/W Revision
Y Axis Unit
Displays the menu keys that enable you to change the vertical (Y) axis amplitude unit. The analyzer retains
the entered Y Axis Unit separately for both Log and Lin amplitude scale types. For example, if Scale Type
has been set to Log, and you set Y Axis Unit to dBm, pressing Scale Type (Log) sets the Y Axis Unit to dBm. If
Scale Type has been set to Lin and you set Y Axis Unit to V, pressing Scale Type (Lin) sets the Y Axis Unit to
V. Pressing Scale Type (Log) again sets the Y axis unit back to dBm.
The units of current (A, dBmA, dBuA) are calculated based on 50 ohms input impedance.
All four of the EMI units (dBµA/m, dBµV/m, dBG, dBpT) are treated by the instrument exactly as though
they were dBuV. The user must load an appropriate correction factor using Amplitude Corrections for
accurate and meaningful results.
If a SCPI command is sent to the analyzer that uses one of the EMI units as a terminator, the analyzer
treats it as though DBUV had been sent as the terminator.
Key Path
Mode
Scope
Remote Command
Example
Notes
Notes
734
[:SENSe]:POWer[:RF]:PADJust:PRESelector?
PSA had multiple preselectors, and you could select which preselector to adjust. Since the X-Series
has only one mm/uW preselector, the preselector selection softkey is no longer available. However,
to provide backward compatibility, we accept the legacy remote commands.
The command form has no effect, the query always returns MWAVe
Prior to A.02.00
AMPTD Y Scale
SA
Meas Global
:UNIT:POWer DBM | DBMV | DBMA | V | W | A | DBUV | DBUA | DBPW | DBUVM
| DBUAM | DBPT | DBG
:UNIT:POWer?
UNIT:POW dBmV
UNIT:POW?
The Y axis unit has either logarithmic or linear characteristics. The set of units that is logarithmic
consists of dBm, dBmV, dBmA, dBµV, dBµA, dBµV/m, dBµA/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.
The settings of Y Axis Unit and Scale Type, affect how the data is read over the remote interface.
When using the remote interface no unit is returned, so you must know what the Y axis unit is to
interpret the results:
Example 1, set the following:
Scale Type (Log)
Y Axis Unit, dBm
Scale/Div, 1 dB
Ref Level, 10 dBm
EMI Receiver Mode Reference