Common measurement settings
R&S
®
FSVA3000/ R&S
®
FSV3000
459
User Manual 1178.8520.02 ─ 08
NOTICE!
Risk of hardware damage due to high power levels. When decreasing the
attenuation manually, ensure that the power level does not exceed the maximum level
allowed at the RF input, as an overload can lead to hardware damage.
For details, see
Chapter 6.4.1.2, "RF attenuation"
Remote command:
Using Electronic Attenuation
If the (optional) Electronic Attenuation hardware is installed on the R&S
FSV/A, you
can also activate an electronic attenuator.
In "Auto" mode, the settings are defined automatically; in "Manual" mode, you can
define the mechanical and electronic attenuation separately.
For an active external frontend, electronic attenuation is not available.
Note:
Electronic attenuation is not available for stop frequencies (or center frequencies
in zero span) above 7
GHz.
In "Auto" mode, RF attenuation is provided by the electronic attenuator as much as
possible to reduce the amount of mechanical switching required. Mechanical attenua-
tion can provide a better signal-to-noise ratio, however.
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 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 6.2.2, "Input source settings"
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 an active external frontend, a preamplifier is not available.
Amplitude and vertical axis configuration
