Measurement Basics
R&S
®
FSW-K7
31
User Manual 1173.9240.02 ─ 23
nected. Furthermore, a status bit (bit 3) in the
STAT:QUES:POW
status register is set.
In this case you must decrease the level at the RF input connector and then close the
message box. Then measurement is possible again. Reactivating the RF input is also
possible via the remote command
INPut:ATTenuation:PROTection:RESet
4.7.2 RF Input from the Analog Baseband Connector
RF input can not only be taken from the RF INPUT connector on the R&S
FSW. If the
optional Analog Baseband Interface is installed and active for input, an RF signal can
be input at the BASEBAND INPUT I connector and redirected from there to the RF
input path. A transducer is activated to compensate for the additional path of the redir-
ected signal. The signal is then processed as usual in the frequency and time domain
as for any other RF input.
This is useful, for example, to perform frequency sweep measurements with (single-
ended or differential) active probes, which can also be connected to the BASEBAND
INPUT I connector.
Frequency sweep measurements on probe input
You can perform RF measurements (measurements in the time or frequency domain)
by connecting a probe to the BASEBAND INPUT I connector and switching the input
source to this connector in the RF input configuration (see
The probe's attenuation is compensated automatically by the R&S
FSW using a trans-
ducer named "Probe on Baseband Input I". (The probe can only be connected on I, as
only input at the I connector can be redirected to the RF path). A comment is assigned
that includes the type, name and serial number of the detected probe. The transducer
is deleted as soon as the probe is disconnected.
For details on transducers see the General Instrument Setup section in the R&S
FSW
User Manual.
For more information on the BASEBAND INPUT connector (R&S
FSW-B71) see the
R&S
FSW R&S
FSW I/Q Analyzer and I/Q Input User Manual.
4.7.3 Using Probes
As an alternative means of input to the R&S
FSW, active probes from Rohde&Schwarz
can be connected to the optional BASEBAND INPUT connectors, if the Analog Base-
band Interface (option R&S FSW-B71) is installed. These probes allow you to perform
voltage measurements very flexibly and precisely on all sorts of devices to be tested,
without interfering with the signal.
Connecting probes
Probes are automatically detected when you plug them into the upper BASEBAND
INPUT connectors on the front panel of the R&S
FSW. The detected information on the
Receiving Data Input and Providing Data Output
