Configuring the RF Signal
R&S
®
SMBV100B
381
User Manual 1178.4460.02 ─ 03
Sample Level
Determines the level at the output of the instrument during the sample process.
"Full"
Provides the currently set level.
NOTICE:
Risk of DUT damage due to high input power
The settings combination "ALC > Sample Level > Full" and "ALC >
State > Off (Sample &Hold)" or "ALC > State > Sample & On" results
in signals with large headroom. With this settings combination, the
R&S
SMBV100B generates a short sample pulse with full RF output
power.
To protect the DUT from damage due to high input power, use the
setting "Sample Level > Attenuated" or "Sample Level > Minimum".
"Attenuated"
Attenuates the signal for about 40 dB to protect external devices like
the DUT from damage due to high input power.
"Minimum"
Attenuates the signal level with the maximum value.
Remote command:
[:SOURce<hw>]:POWer:ALC:SLEVel
6.12.3
User Correction
The R&S
SMBV100B supports a correction function to compensate external losses,
caused, for example, by the RF cable, to achieve a precise target input level at the
DUT.
The signal at the RF outputs of the R&S
SMBV100B is flat. However, the DUT is usu-
ally not connected directly to the outputs of the instrument but rather via connecting
cables. Components like cables, power combiners, switches or mixers can affect the
signal flatness at the DUT input.
Figure 6-18: Effect of external losses on the signal flatness at the DUT input
DUT
= Device under test
Components = Designation of all components between the measurement equipment and the DUT, e.g.
cables
1
= Flat signal at the outputs of the R&S
SMBV100B
2
= Signal received at the DUT, incl. the external losses
Improving Level Performance
