Configuring the RF Signal
R&S
®
SMW200A
570User Manual 1175.6632.02 ─ 30
8.9.2.3 How to Enable the ALC
1. Select "RF" > "RF Level" > "Automatic Level Control".
2.
NOTICE! Risk of DUT damage due to high input power. The ALC modes "State" >
"Off (Sample & Hold)" and "State" > "Sample & On" use a short sample pulse to set
the level control. With the setting "Sample Level" > "Full", this sample pulse results
in a CW RF pulse. Usually, the RMS value of this CW pulse equals the configured
RMS level value of the signal, but it can also rise up to the PEP level.
To protect the DUT from damage due to high input power, use the following setting
combinations for the sampling states "Off (Sample & Hold)" or "Sample & On":
● Set "Sample Level " > "Attenuated" or
● Set "Sample Level " > "Minimum".
3. Set "RF" > "State" > "On".
8.9.3 User Correction
The R&S SMW 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 SMW is flat. However, the DUT is usually 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 8-20: 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 SMW
2 = Signal received at the DUT, incl. the external losses
About UCOR
User correction (UCOR) is a method that determines the external level loss over a fre-
quency range in advance, see Figure 8-21.
Improving Level Performance
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