R&S SMA100B - Attenuator Settings

Improving level performance
R&S
®
SMA100B
214User Manual 1178.3834.02 ─ 09
However, option R&S SMAB-B36S does not support using the mechanical attenuator
below 20 GHz.
According to the requirements of your application, you can select different attenuator
characteristics.
The following are examples of test requirements and the corresponding configuration:
●
Automatic configuration
Select standard operation mode ("Auto"), in which the generator adjusts the attenu-
ation of the RF output signal automatically.
●
DUT tests under low signal to noise conditions
Low output power is suitable to test the behavior of a DUT under low signal to
noise conditions.
●
Uninterrupted level settings with constant VSWR
A fix attenuation value is required for obtaining uninterrupted level settings with
constant VSWR.
The configuration "RF Off Mode > Unchanged" ensures that constant VSWR is
maintained if you turn the signal off and on again.
●
Noise sensitive applications
The parameter "RF OFF Mode > Full Attenuation" sets maximum attenuation and
thus suppresses noise when you turn off the RF signal.
8.1.1 Attenuator settings
Access:
► Select "Level" > "Level > Attenuator".
In the "Attenuator" dialog, you can select the operating mode of the electronic step
attenuator.
The remote commands required to define these settings are described in Chap-
ter 14.13, "OUTPut subsystem", on page 489 and Chapter 14.16.11, "SOURce:POWer
subsystem", on page 681.
Attenuator