R&S FSV3000 Series, User Manual

Page: 68 / 307

Configuration
R&S
®
FSV/A3000 I/Q Analyzer
68 User Manual 1178.8536.02 ─ 01
When you switch off electronic attenuation, the RF attenuation is automatically set to
the same mode (auto/manual) as the electronic attenuation was set to. Thus, the RF
attenuation can be set to automatic mode, and the full attenuation is provided by the
mechanical attenuator, if possible.
The electronic attenuation can be varied in 1
dB steps. If the electronic attenuation is
on, the mechanical attenuation can be varied in 5 dB steps. Other entries are rounded
to the next lower integer value.
If the defined reference level cannot be set for the given attenuation, the reference
level is adjusted accordingly and the warning "limit reached" is displayed in the status
bar.
Remote command:
INPut<ip>:EATT:STATe
on page 177
INPut<ip>:EATT:AUTO
on page 176
INPut<ip>:EATT
on page 176
Input Settings
Some input settings affect the measured amplitude of the signal, as well.
The parameters "Input Coupling" and "Impedance" are identical to those in the "Input"
settings.
See Chapter 5.3.1, "Input Source Settings" , on page 51.
Preamplifier ← Input Settings
If the (optional) internal preamplifier hardware is installed, a preamplifier can be activa-
ted for the RF input signal.
You can use a preamplifier to analyze signals from DUTs with low output power.
For R&S FSV/A3004, 3007, 3013, and 3030 models, the following settings are availa-
ble:
"Off" Deactivates the preamplifier.
"15 dB" The RF input signal is amplified by about 15 dB.
"30 dB" The RF input signal is amplified by about 30 dB.
For R&S FSV/A44 or higher models, the input signal is amplified by 30 dB if the pream-
plifier is activated. In this case, the preamplifier is only available under the following
conditions:
●
In zero span, the maximum center frequency is 43.5 GHz
●
For frequency spans, the maximum stop frequency is 43.5 GHz
●
For I/Q measurements, the maximum center frequency depends on the analysis
bandwidth:
f
center
≤
43.5 GHz - (<Analysis_bw> / 2)
If any of the conditions no longer apply after you change a setting, the preamplifier is
automatically deactivated.
Remote command:
INPut<ip>:GAIN:STATe
on page 178
INPut<ip>:GAIN[:VALue]
on page 178
Amplitude