Configuring the RF Signal
R&S
®
SMW200A
567User Manual 1175.6632.02 ─ 30
The R&S SMW switches briefly in the CW mode and enables ALC to adjust the
level to the set target value. The instrument freezes this setting, turns off ALC
again, and switches back to the operating mode.
●
"Sample & On"
Initially the level control circuit uses a sample process to settle to the current level.
When settled, it continues level control with highest level accuracy.
●
"Off (Table)"
Deactivates internal level control loop. The instrument calculates every level setting
using the attenuation values from the internal (ALC) table. Level attenuation
between two table values is done with linear interpolation. This mode enables you
to perform a fast and strictly monotonic, but not quite as precise level adjustment.
This mode achieves fastest setting times, since the output signal is not interrupted
by the measurement, and also not disturbed.
●
"Table & On"
Starts with the associated value of the internal level table and then activates the
automatic level control. This mode achieves maximum level accuracy and fast set-
ting times.
The R&S SMW displays the level control setting as a status message in the info line.
How to: See Chapter 8.9.2.3, "How to Enable the ALC", on page 570.
8.9.2.1 Required Options
The equipment layout for automatic level control includes:
●
Option frequency (e.g. R&S SMW-B1003/-B2003)
8.9.2.2 ALC Settings
Access:
► Select "RF" > "RF Level" > "Automatic Level Control".
In the "ALC" dialog, you can configure the settings for the automatic level control of
the RF signal to achieve optimal accuracy.
Improving Level Performance
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