6 Input/Output
6.2 Input
mirrored from the I channel. That way you only need to set up one channel (the I
channel). The I channel values are copied to the Q channel, so at the time Q Same as
I is turned off the I and Q channel setups will be identical. This does not apply to
Probe settings or to parameters that are determined by the probe.
Remote
Command
:INPut:IQ:MIRRored OFF | ON | 0 | 1
:INPut:IQ:MIRRored?
Example Turn off the mirroring of parameters from I to Q:
:INP:IQ:MIRR OFF
Couplings Only displayed for the Q channel. When Yes, the I channel values for some parameters are mirrored
(copied) to the Q channel. However, when a parameter is determined by the type of probe and a probe
is sensed, the probe setting is always used and the I channel setting is ignored. The following
parameters are mirrored:
Differential Input (when not determined by probe)
Input Z (when not determined by probe)
Preset Unaffected by Preset, but set to the default value (Q Same as I set to ON) by Restore Input/Output
Defaults or Restore System Defaults->All
State Saved Saved in instrument state
Range
OFF | ON
Differential
Selects differential input on or off for the Q channel. For differential input (also called
balanced input), the instrument uses both the Q and Q-bar ports. When differential
input is off (also called single-ended or unbalanced input), the instrument uses only
the Q port.
Remote
Command
:INPut:IQ:Q:DIFFerential OFF | ON | 0 | 1
:INPut:IQ:Q:DIFFerential?
Example Put the Q channel in Differential mode:
:INP:IQ:Q:DIFF ON
Put the Q channel in Single Ended mode:
:INP:IQ:Q:DIFF OFF
Notes When Differential Input = ON, the instrument checks for attenuation mismatches between the Q and Q-
bar ports. If the difference in attenuation values exceeds 0.5 dB a Settings Alert error condition, error
159 will be set
When Q Differential Input = ON, and IQ Path is I+jQ, the I Differential input must also be ON. Similarly,
when Q Differential Input = OFF, and IQ Path is I+jQ, the I Differential input must also be OFF. If the
states of the two inputs do not match, an error condition message is generated, 159; Settings Alert; I/Q
mismatch: Differential
Couplings Some active probes include built-in differential capability. When one of these probes is sensed, this key
is disabled. Since the differential capability is handled in the probe, the Instrument will use only the
main port and the key will show that the Instrument's Differential Input mode is Off (indicating that the
2388 Spectrum Analyzer Mode User's &Programmer's Reference
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