Keysight E6680A - Page 248

3 IQ Analyzer (Basic) Mode
3.1 Complex Spectrum Measurement
When reducing the Digital IF Bandwidth, the selected IF Path is the narrowest
possible path applicable.
For example, an instrument with B25, B40 and B1X installed, and you currently have
IF Path Auto set to ON and the Digital IF Bandwidth is 50MHz, the IF Path selection
will be 140MHz . If the bandwidth decreases and the value is 40MHz or narrower
(but above 25MHz), the IF Path will automatically change to 40MHz . Similarly, for
bandwidths equal to or narrower than 25MHz (but above 10MHz), the 25MHz path
is selected. For bandwidths equal to or narrower than 10MHz, the 10MHz path is
selected.
These rules apply even for DIF configurations of Swept DIF + WBDIF.
If the External path is available in the IF Path menu (see "Connecting an
Oscilloscope as an External Digitizer" on page 244), it will be automatically selected
when IF Path is set to AUTO and you increase the Digital IF Bandwidth above the
widest IF Path that was listed above External.
When B2X/B5X/B1G/B1500M/B2G/B4G paths are available, in Auto mode, the
selections may be disabled if the center frequency of the measurement is not in
range of the minimum/maximum center frequency requirement for these IF Paths.
Depending on the specific hardware, the minimum/maximum center frequency
varies for these IF Paths. In Auto mode, these IF Paths become enabled when the
center frequency of the measurement falls within the valid frequency range
specified for that IF Path. In Auto mode, if the center frequency is not in range, the
application switches into the widest IF Path that can satisfy the center frequency. In
Manual mode, the center frequency is clipped to minimum/maximum value that
specific IF Path allows. A warning message alerts you of the settings conflict.
Remote Command
[:SENSe]:<meas>:IFPath B10M | B25M | B40M | B85M | B125M | B140M | B160M |
B255M | B510M | B1G | B1500M | B2G | B4G | EXT
[:SENSe]:<meas>:IFPath?
[:SENSe]:<meas>:IFPath:AUTO ON | OFF | 1 | 0
[:SENSe]:<meas>:IFPath:AUTO?
For the SPEC and WAVmeasurements in IQ Analyzer (Basic) Mode, omit the <meas> node. For the
VMA Mode Digital Demod measurement, replace the <meas> node with that for the active
measurement; in this case DDEMod
Example IQAnalyzer Mode:
IFP B25M
IFP?
IFP:AUTO ON
VMAMode, DDEMod measurement:
DDEM:IFP B25M
IQ Analyzer Mode User's &Programmer's Reference 248