Instrument Tour
R&S
®
FSW
44
Getting Started 1338.4102.02 ─ 08
Risk of instrument damage
Do not fasten the 1.00
mm RF Input connector with a torque larger than
0.23
Nm. Rohde
&
Schwarz offers an appropriate torque wrench (R&S
®
ZN-
ZTW Torque 0.23
Nm; delivered with the instrument).
The RF input can be coupled to the DUT by alternating current (AC) or direct cur-
rent (DC). AC coupling blocks any DC voltage from the input signal. This is the
default setting to prevent damage to the instrument. However, some specifica-
tions require DC coupling. In this case, you must protect the instrument from
damaging DC input voltages manually. For details, refer to the data sheet. For
details on coupling, see the chapter on radio frequency input in the R&S
FSW
user manual.
See also
Chapter 4.14, "Considerations for Test Setup"
For R&S
FSW85 models, which have two input connectors, you must define
which input source is used for each measurement channel.
5.1.8
EXT MIXER Connector (Optional)
Connect external mixers to the EXT MIXER LO OUT/IF IN and IF IN female con-
nectors to increase the available frequency range. These connectors are optional
and only available with R&S
FSW-B21.
If no external mixers are connected to the R&S
FSW, cover the two front connec-
tors LO OUT / IF IN and IF IN with the supplied SMA caps.
5.1.9
(Analog) Baseband Input 50
Ω Connectors (Optional)
The Analog Baseband Interface option provides four "Baseband input" BNC con-
nectors on the front panel of the R&S
FSW for analog I and Q signals
(R&S
FSW85: two connectors).
Front Panel View
