6 Input/Output
6.2 Input
complementary port not in use)
When a differential probe is not sensed and Q Same as I is On, the value set for I will be copied to Q.
This key is disabled when Q Same as I is On
Preset
OFF
State Saved Yes
Unaffected by a Preset, but set to the default value by Restore Input/Output Defaults or Restore System
Defaults->All
Range
OFF | ON
Annotation The LED on the Q-bar port indicates the Differential Input setting
Input Z
Selects the input impedance for the Q channel. The impedance applies to both the Q
and Q-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.
Remote
Command
:INPut[1]:IQ:Q:IMPedance LOW | HIGH
:INPut[1]:IQ:Q:IMPedance?
Example Set the Q channel input impedance to 1 MΩ:
:INP:IQ:Q:IMP HIGH
Set the Q channel input impedance to 50 Ω:
:INP:IQ:Q:IMP LOW
Notes 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
Couplings 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 and Q Same as I is On, the value set for I will also be copied to Q. This key is
disabled when Q Same as I is On
Preset
LOW
State Saved Yes
Unaffected by a Preset, but set to the default value by Restore Input/Output Defaults or Restore System
Defaults->All
Range 50 Ω | 1 MΩ
Annotation "Q:<Q Input Z>" (examples, "Q:50Ω" or "Q:1MΩ") in the Measurement Bar. The annotation shows both
the I and Q Input Z values
Spectrum Analyzer Mode User's &Programmer's Reference 2389
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