Keysight E6680A - IF Gain

3 IQ Analyzer (Basic) Mode
3.1 Complex Spectrum Measurement
other case, an error message is generated, -241,"Hardware missing; Option H1G required"
Only appears in some Modes (for example, VMA and IQ Analyzer)
LO Dither is turned OFF and grayed-out when IF Path is set to a path other than 1 GHz. If you press
the grayed-out control, a warning message “LO Dither only available with IF Path 1 GHz” is shown. If
you try to set LO Dither to ON remotely while it is grayed-out, a message “-221,Settings conflict; LO
Dither only available with IF Path 1 GHz" is returned
When LO Dither is ON, "Phase Noise Optimization" on page 251 is grayed-out. If you try to change the
PNO value via front panel or SCPI in that case, an error is generated, “LO Dither must be turned off to
change this value"
Couplings As with most parameters with an AUTO state, Auto Couple sets it to Auto, which then picks
AUTOrange, and setting any specific value (AUTOrange, LOW or HIGH) will set the Auto state to
OFF
When LO Dither is ON, Phase Noise Optimization is set to “Best Close-In”. If the Phase Noise
Optimization value changes due to turning on LO Dither, a warning message “Phase Noise
Optimization changed due to LO Dither activation” is shown
Preset
OFF
State Saved Saved in instrument state
IF Gain
Accesses controls to set the ranging in the digital IF when doing FFT sweeps. When
in AUTOrange mode, the IF checks its range once for every FFT chunk, to provide
the best signal to noise ratio. You can specify the range for the best FFT speed, and
optimize for noise or for large signals.
When this function is in AUTOrange, the IF Gain is set ON initially for each chunk of
data. The data is then acquired. If the IF overloads, then the IF Gain is set OFF and
the data is re-acquired. Because of this operation, the "Auto" on page 261 setting
uses more measurement time as the instrument checks/resets its range. You can
get faster measurement speed by forcing the range to either the HIGH or LOW gain
setting, but you must ensure that your measurement conditions meet the following
criteria:
–
Signals will not overload the IF (in the high gain range)
–
Signals are well above the noise floor (for the low gain range)
–
Signals are not changing
Remote
Command
Complex Spectrum:
[:SENSe]:SPECtrum:IF:GAIN[:STATe] AUTOrange | LOW | HIGH | OTHer
[:SENSe]:SPECtrum:IF:GAIN[:STATe]?
Streaming:
[:SENSe]:STReaming:IF:GAIN[:STATe] AUTOrange | LOW | HIGH | OTHer
IQ Analyzer Mode User's &Programmer's Reference 260