Keysight x-series User Reference Manual page 613

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
Dependencies
Couplings
EMI Receiver Mode Reference
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
This sets the top line to 10 dBm with each vertical division representing 1 dB. Thus, if a point on
trace 1 is on the fifth graticule line from the top, it represents 5 dBm and will read out remotely as 5.
Example 2, set the following:
Scale Type (Lin)
Y Axis Unit, Volts
Ref Level, 100 mV (10 mV/div)
This sets the top line to 100 mV and the bottom line to 0 V, so each vertical division represents 10
mV. Thus, if a point on trace 1 is on the fifth graticule line from the top, it represents 50 mV and will
read out remotely as 50.
If an amplitude correction with an Antenna Unit other than None is applied and enabled, then that
antenna unit is forced and the key with that unit is the only Y Axis Unit available. All other Y Axis Unit
keys are grayed out.
If an amplitude correction with an Antenna Unit other than None is applied and enabled, and you then
turn off that correction or set Apply Corrections to No, the Y Axis Unit that existed before the Antenna
Unit was applied is restored.
The analyzer retains the entered Y Axis Unit separately for both Log and Lin amplitude scale types
9 Strip Chart Measurement
AMPTD Y Scale
613