3 VMA Mode
3.4 IQ Waveform Measurement
Spur Avoidance
Because VXT models M9410A/11A/15A/16A are direct-conversion (zero-IF)
receivers, feedthrough leakage from the local oscillator appears as a spurious signal
(spur) at the center frequency. The Spur Avoidance function is provided to eliminate
this spur, at the expense of some measurement speed.
When Spur Avoidance is enabled (the default), the instrument uses a software
algorithm to remove this spur from the displayed measurement data, but the
algorithm only operates under certain conditions. Specifically, it only operates when
the Digital IF BW<= maxBW/2.5. See "More Information" on page 762.
You can disable this function to speed up your measurement, by setting Spur
Avoidance to Disabled.
Note that when Spur Avoidance is not in effect, either because you have disabled it
or because the Digital IF BW > maxBW/2.5, the following warning message appears
in the status bar: “Settings Alert; Spur Avoidance Off”. This is to alert you that
measurement accuracy might be impacted by the fact that Spur Avoidance is not in
effect.
The spur avoidance function is not available for:
–
M9410A/11A with EP6 option at frequency above 6 GHz
–
M9415A/16A at frequency below 380 MHz and above 12.3 GHz
–
M9410E/11E/15E/16E at frequency below 380 MHz and above 25.9 GHz
Remote Command
[:SENSe]:WAVeform:SAVoid[:STATe] ON | OFF | 0 | 1
[:SENSe]:WAVeform:SAVoid[:STATe]?
Example
:WAV:SAVoid ON
:WAV:SAVoid?
Dependencies Only appears in VXT models M9410A/11A/15A/16A and M9410E/11E/15E/16E
Preset
OFF
State Saved Saved in instrument state
Range
ON|OFF
More Information
The Maximum Digital IF BW depends on the installed options, and selected Center
Frequency.
Vector Modulation Analyzer Mode User's &Programmer's Reference 762
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