Keysight E6680A - Page 177

3 IQ Analyzer (Basic) Mode
3.1 Complex Spectrum Measurement
Measurement µW Path Control Auto behavior
and “Allow Full Bypass in Auto” is On ), otherwise choose Preselector Bypass
Monitor Spectrum Always Standard Path
IQ Waveform Use Standard Path unless tuned frequency > 3.6GHz and IFBW > 15MHz, in
which case choose Preselector Bypass
CCDF Use Standard Path unless tuned frequency > 3.6GHz and IFBW > 15MHz, in
which case choose Preselector Bypass
Remote Command
[:SENSe]:POWer[:RF]:MW:PATH:AUTO ON | OFF | 1 | 0
[:SENSe]:POWer[:RF]:MW:PATH:AUTO?
Example
:POW:MW:PATH:AUTO ON
:POW:MW:PATH:AUTO?
Dependencies Only appears in VMA, WLAN, 5G NR and CQM Modes
Couplings See "µW Path Control Auto" on page 175 above
Preset
ON
Range
ON|OFF
Low Noise Path Enable
Low Noise Path Enable provides a lower noise floor under some circumstances,
particularly when operating in the 21–26.5GHz region. With the Low Noise Path
enabled, the low band/high band switch and microwave preamp are bypassed
whenever all the following are true:
–
The instrument is not in the Low Band, meaning:
–
the start frequency is above 3.5GHz and
–
the stop frequency is above 3.6GHz
–
The internal preamp is not installed, or if installed, is set to Off or Low Band
Note that this means that, when any part of a sweep is done in Low Band, the Low
Noise Path is not used, whether or not the Low Noise Path Enable is selected in the
user interface. Also, if the preamp is turned on, the Low Noise Path is not used,
whether or not the Low Noise Path Enable is selected in the user interface. The only
time the Low Noise Path is used is when Low Noise Path Enable is selected, the
sweep is completely in High Band (> 3.6 GHz) and no preamp is in use.
For measurements that use IQ acquisition, the low noise path is used when Center
Frequency is in High Band (> 3.6GHz) and no preamp is in use. In other words, the
rules above are modified to use only the center frequency to qualify which path to
switch in. This is not the case for FFTs in the Swept SA measurement; they use the
same rules as swept measurements.
177 IQ Analyzer Mode User's &Programmer's Reference