Rf Input Port - Keysight x-series User Reference Manual

4 Input/Output Functions
Input/Output
When operating in DC coupled mode, ensure protection of the analyzer input circuitry by limiting the DC
part of the input level to within 200 mV of 0 Vdc. In AC or DC coupling, limit the input RF power to +30 dBm
(1 Watt).
Key Path
Remote Command
Example
Dependencies
Preset
State Saved
Initial S/W Revision
Modified at S/W Revision

RF Input Port

Specifies the RF input port used. The RF Input Port key only appears on units with multiple inputs, and lets
you switch between the two inputs.
Switching from the RF input port to one of the RFIO ports, on units that have them, changes the receiver
performance of the instrument.
Key Path
Remote Command
Example
Dependencies
Preset
State Saved
Readback
Backwards
154
Input/Output, RF Input
:INPut:COUPling AC|DC
:INPut:COUPling?
INP:COUP DC
This key does not appear in models that are always AC coupled. When the SCPI command to set DC
coupling is sent to these models, it results in the error "Illegal parameter value; This model is always
AC coupled" In these models, the SCPI query INP:COUP? always returns AC.
This key does not appear in models that are always DC coupled.When the SCPI command to set AC
coupling is sent to these models, it results in the error "Illegal parameter value; This instrument is
always DC coupled" In these models, the SCPI query INP:COUP? always returns DC.
AC on models that support AC coupling
On models that are always DC coupled, such as millimeter wave models (frequency ranges 30 GHz
and above), the preset is DC.
Saved in instrument state.
Prior to A.02.00
A.03.00
Input/Output, RF Input
[:SENSe]:FEED:RF:PORT[:INPut] RFIN | RFIN2 | RFIO1 | RFIO2 | RFIO3 |
RFIO4
[:SENSe]:FEED:RF:PORT[:INPut]?
:FEED:RF:PORT RFIN
This key only appears in models that support multiple inputs. If the SCPI command is sent with
unsupported parameters in any other model, an error is generated, –221.1900, "Settings
conflict;option not installed"
When any input is selected in a measurement that does not support it, the "No result; Meas invalid
with this input" error condition occurs, and the measurement returns invalid data when queried.
This is unaffected by Mode Preset but is set to RF on a "Restore Input/Output Defaults" or "Restore
System Defaults -> All"
Saved in instrument state
The current RF Input Port selected is read back to this key
INPut<1|2>:TYPE INPUT1 | INPUT2
EMI Receiver Mode Reference