Agilent Technologies X Series Manual page 410

Input/Output
Example
Notes
Couplings
Preset
State Saved
Initial S/W Revision
Signal ID On/Off
Activates or deactivates an algorithm which aids with the identification of multiple responses
Toggles the Signal ID (signal identification) function On or Off. This function lets you identify multiple
responses of a single input signal that are generated when using un-preselected external mixers. The use
of mixers without pre-selecting filters offers the advantage of improved receiver sensitivity because of
the absence of the filter insertion loss, but results in multiple responses due to images and undesired
harmonic mixing products.
While in Signal ID, basic spectrum analyzer functions work normally (for example, you can change
Span normally) but some functions are disabled (for example, some traces are unavailable).
There are two forms of Signal ID, Image Suppress and Image Shift. Choose the one most appropriate for
your application. For Image Shift, an LO-shifted and an unshifted trace are taken in Trace 1 and Trace 2
and displayed together. Any peaks that are not the same in both traces are images. For Image Suppress,
image cancellation is performed in the background using two hidden traces, and the result displayed in
Trace 1, which shows only the valid signals.
Key Path
Remote Command
Example
Notes
410
:MIX:LOD 0
:MIX:LOD?
The query returns the doubler value of the first row of the harmonic table.
When you set a value for the Doubler setting, the Mixer Selection changes to
"Custom"
This is unaffected by Mode Preset, but on a "Restore Input/Output Defaults"
editing is turned off, the Harmonic Table returns to normal, and the Mixer is
preset to 11970A, which has the double Off in the first row of its Harmonic
Table
Saved in state
A.08.01
Input/Output, External Mixer
[:SENSe]:SIDentify[:STATe] OFF|ON|0|1
[:SENSe]:SIDentify[:STATe]?
:SID 0
:SID?
Signal ID uses data from two successive sweeps. Therefore, if the analyzer is
in single sweep mode, two sweep triggers are used to generate the data needed
for signal identification.