Keysight x-series User Reference Manual page 163

Range
Initial S/W Revision
Remote Command
Notes
Preset
Initial S/W Revision
I Input Z
Selects the input impedance for the I channel. The impedance applies to both the I and I-bar ports.
The input impedance controls the hardware signal path impedance match. It is not used for converting
voltage to power. The voltage to power conversion always uses the Reference Z parameter. The
Reference Z parameter applies to both I and Q channels.
Key Path
Remote Command
Example
Notes
Couplings
Preset
State Saved
Range
Initial S/W Revision
EMI Receiver Mode Reference
Off | On
Prior to A.02.00
:INPut[1]:IQ:BALanced[:STATe] OFF|ON|0|1
:INPut[1]:IQ:BALanced[:STATe]?
For R&S FSQ-B71 compatibility, with no independent settings for the I and Q channels. Therefore, it
is tied only to the I channel and does not provide an equivalent for the Q channel. For proper
operation of the backwards compatibility command Q Same as I should be set to On.
OFF
Prior to A.02.00
Input/Output, I/Q, I Setup
:INPut[1]:IQ[:I]:IMPedance LOW|HIGH
:INPut[1]:IQ[:I]:IMPedance?
Set the I channel input impedance to 1 MΩ
INP:IQ:IMP HIGH
LOW = 50 Ω, HIGH = 1 MΩ
When IQ Path is I+jQ, the I Input Z setting must be the same as the Q Input Z setting. If the settings
of the two inputs do not match, an error condition message is generated, 159;Settings Alert;I/Q
mismatch:Input Z.
Input impedance is a built-in characteristic of a probe. Therefore, whenever a probe is sensed, this
key is disabled and the value is set to match the probe.
When no probe is sensed on Q and Q Same as I is On, the value set for I will also be copied to Q.
LOW
Yes
This is unaffected by a Preset but is set to the default value on a "Restore Input/Output Defaults" or
"Restore System Defaults->All"
50 Ω | 1 MΩ
Prior to A.02.00
4 Input/Output Functions
Input/Output
163