3 IQ Analyzer (Basic) Mode
3.1 Complex Spectrum Measurement
Lets you alternate between mixing modes for the Local Oscillator (LO). The default
setting is NORMal LO mixing mode, which is determined by the instrument
configuration to be either “high side” or “low side”. The query returns “High” or
“Low” to determine whether the mixing is “high side” or “low side”. If Mixing Mode is
toggled between NORMal and ALTernate, then Mixing Mode State also toggles
between “High” and “Low”.
Remote Command
[:SENSe]:SPECtrum:LO:MIXMode:SIDE?
[:SENSe]:WAVeform:LO:MIXMode:SIDE?
Example
:SPEC:LO:MIXM:SIDE?
:WAV:LO:MIXM:SIDE?
Dependencies Not available in N9000B
Couplings When Mixing Mode is toggled between NORMal and ALTernate, Mixing Mode State also toggles
between High and Low
Range High | Low
Invert Spectrum
The Spectrum toggle when set to NORMal has no effect on the measurement. When
set to INVert, I/Q data is conjugated, which inverts the spectrum. Setting Spectrum
to INVert swaps the lower and upper sides of Center Frequency.
Also affects the results of the :MEASure, :READ, and :FETCh commands for
SPECtrum3 data (see Remote Command Results table in "Complex Spectrum
Measurement" on page 143). If set to INVert, the I/Q data returned is conjugated,
otherwise the data is raw I/Q.
Remote Command Not supported in STReaming measurement
[:SENSe]:SPECtrum:SPECtrum NORMal | INVert
[:SENSe]:SPECtrum:SPECtrum?
Example
:SPEC:SPEC INVert
Preset
NORMal
State Saved Saved in instrument state
IF Frequency (Remote Command Only)
Available only in the Complex Spectrum, Streaming, and Waveform measurements.
Returns the current IF Frequency used in the IF Path.
Remote
Command
[:SENSe]:SPECtrum:IF:FREQuency?
[:SENSe]:WAVeform:IF:FREQuency?
Example
:SPEC:IF:FREQ?
267 IQ Analyzer Mode User's &Programmer's Reference
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