Keysight E6680A - Page 155

3 IQ Analyzer (Basic) Mode
3.1 Complex Spectrum Measurement
If the current mechanical attenuation is below 6dB, it can be increased with the knob and step keys,
but not decreased
Max
CXA Option 503 or 507 50dB
EXA 60dB
All other models 70dB
Note that in the Single-Attenuator configuration, the total of ATT and EATT cannot exceed 50dB. So, if
the EATT is set to 24dB first, the main attenuation cannot be greater than 26dB and will be reduced
accordingly; if the main attenuator is set to 40dB first, EATT cannot be greater than 10dB
Annotation The current value for Total Atten is displayed in the Measurement Bar at the top of the display. A value
appears for Electronic Attenuation only if the Electronic Attenuator is enabled. The annotation appears
as:
Atten: <total>dB (e<elec>)
The e letter is in amber in Single-Attenuator configurations
For example:
Dual-Attenuator configuration:
Atten: 24dB (e14)
Indicating the total attenuation is at 24dB and the electronic attenuation is at 14dB
Single-Attenuator configuration:
A: 24dB (e14)
Indicating the total attenuation is at 24dB and the “soft” attenuation is at 14dB (see below for
definition of “soft” attenuation)
When in Manual, a # sign appears in front of Atten in the annotation
Auto Function
Remote Command
[:SENSe]:POWer[:RF]:ATTenuation:AUTO OFF | ON | 0 | 1
[:SENSe]:POWer[:RF]:ATTenuation:AUTO?
Example Turn Auto Mech AttenON:
:POW:ATT:AUTO ON
Dependencies :POW:ATT:AUTO is only available in measurements that support Auto, such as Swept SA
Preset
ON
Attenuator Configurations and Auto/Man
As described under "Attenuation" on page 293, there are two distinct attenuator
configurations available in the X-Series, the Single Attenuator and Dual-Attenuator
configurations.
In Dual-Attenuator configurations, we have mechanical attenuation and electronic
attenuation, and current total attenuation is the sum of electronic + mechanical
attenuation.
155 IQ Analyzer Mode User's &Programmer's Reference