Rohde & Schwarz R&S SMB100B - User Correction

Improving level performance
R&S
®
SMB100B
156User Manual 1178.3711.02 ─ 08
The level detector of the ALC has multiple paths distinguished by their sensitivity.
"Auto"
Selects the detector path automatically, according to the given level.
This mode is the recommended operation mode.
"Low"
Selects the detector path with low sensitivity.
This setting is intended for signals with high internal electronic levels.
"Med"
Selects the path with medium sensitivity.
This setting corresponds to normal mode. It is intended for signals
with medium internal electronic levels.
"High"
Selects the detector path with high sensitivity, intended for signals
with low internal electronic levels.
"Fix"
Fixes the last set sensitivity setting.
Remote command:
[:SOURce<hw>]:POWer:ALC:DSENsitivity on page 493
7.3 User correction
The R&S SMB100B 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 SMB100B 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 7-1: 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 SMB100B
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 7-2.
User correction