3 IQ Analyzer (Basic) Mode
3.1 Complex Spectrum Measurement
Selection is set to 25 MHz with IF Path Auto set OFF, the maximum bandwidth value
will be clipped to 25 MHz.
Remote Command Complex Spectrum:
[:SENSe]:SPECtrum:DIF:BANDwidth <freq>
[:SENSe]:SPECtrum:DIF:BANDwidth?
Streaming:
[:SENSe]:STReaming:DIF:BANDwidth <freq>
[:SENSe]:STReaming:DIF:BANDwidth?
Example
:SPEC:DIF:BAND 1MHz
:SPEC:DIF:BAND?
Dependencies To set a 2 GHz Span with Option R20, Center Frequency must be equal to or greater than 3.5 GHz
To set a 4 GHz Span with Option R40, Center Frequency must be equal to or greater than 10 GHz
If IF Path Auto is OFF, the maximum value depends on which IF Path is currently selected. If 10 MHz,
25 MHz, 40 MHz, 85 MHz, 125 MHz, 140MHz or 160 MHz path is selected, the maximum value of this
parameter will be 10, 25, 40, 85, 125, 140 or 160 MHz respectively
If IF Path Auto is ON, the maximum value is the maximum Digital IF BW available in the instrument
regardless of the current IF Path selection. For example, if the instrument has Options B25, B40 and
B1X installed, clearly the maximum available Digital IF BW of the instrument is 140 MHz. Thus, if IF
Path Auto is ON and IF Path selection is B25M, the maximum Digital IF BW is not limited to 25 MHz but
is 140 MHz
Couplings The bandwidth of the IF Filter is coupled to Span by the following equations
Digital IF BW = Span * 1.5
When Option DP2, B40, or wider IF Bandwidth option is installed:
Digital IF BW = Span
Used as is, since continuous bandwidths are allowed
For all other configurations:
Since the Digital IF BW can only be set to discrete values, Digital IF BW is not always set by the exact
value above
If the HW cannot set to the exact value of the requested Digital IF BW, it uses “the next wider
bandwidth value” available
For instance, a Digital IF BW requested to be set at 3.01 MHz is quantized to 3.1 MHz in the UI and
hardware
Preset 8 MHz
State Saved Yes
Min 10 Hz
Max Hardware Dependent, as detailed in the table of "Maximum Values" on page 236 below
Backwards
Compatibility SCPI
Not supported in STReaming measurement
[:SENSe]:SPECtrum:BANDwidth:PFFT[:SIZE]
[:SENSe]:SPECtrum:BWIDth:PFFT[:SIZE]
[:SENSe]:SPECtrum:BANDwidth|BWIDth:IF[:SIZE]
235 IQ Analyzer Mode User's &Programmer's Reference
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