Agilent Technologies X Series Manual page 250

Complex Spectrum Measurement
Meas Setup
Dependencies
Couplings
Preset
State Saved
Min
Max
250
For applications that have the IF Path Selection menu such as the BASIC
mode, if IF Path Auto is OFF, the maximum value depends on which IF Path
is currently selected. If 10 MHz, 25 MHz, 40 MHz or 140 MHz paths are
selected, the maximum value of this parameter will be 10,25,40 or 140 MHz
respectively. If IF Path Auto is ON, the maximum value will be the maximum
Digital IF BW available in the instrument regardless of the current IF Path
Selection. For example, say that the instrument had the 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.
The bandwidth of the IF Filter is coupled to the span by the following
equations.
Digital IF BW = Span * 1.5
For PXA or when Option B40 is available:
Digital IF BW = Span * 1.5
is 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.
Hardware Dependent:
No Option = 10.0 MHz
Option B25 = 25.0 MHz
Option B40 and/or B140 = 12.0 MHz
Saved in instrument state.
10 Hz
Hardware Dependent:
RF Input:
No Option = 10 MHz
Option B25 = 25 MHz
Option B40 = 40.0 MHz
Option B1X = 140.0 MHz
I/Q Input:
No Option = 10 MHz per channel (20 MHz for I+jQ)
Option B25 = 25 MHz per channel (50 MHz for I+jQ)
Option S40 = 40 MHz per channel (80 MHz for I+jQ)