Rohde & Schwarz FSW13, User Manual

Page: 339 / 1150

Common Measurement Settings
R&S
®
FSW
339 User Manual 1173.9411.02 ─ 19
approximate normalization is possible, it is important to consider the required frequen-
cies for calibration in advance. The frequencies and levels supported by the connected
signal generator are provided for reference with the interface configuration.
Two different methods are available to define the frequencies for calibration, that is to
couple the frequencies of the R&S
FSW with those of the signal generator:
●
Manual coupling : a single frequency is defined
●
Automatic coupling : a series of frequencies is defined (one for each sweep
point), based on the current frequency at the RF input of the R&S FSW; the RF fre-
quency range covers the currently defined span of the R&S FSW (unless limited by
the range of the signal generator)
Automatic coupling
If automatic coupling is used, the output frequency of the generator (source frequency)
is calculated as follows:
Offset
r Denominato
Numerator
RF Freq Source
  
Output frequency of the generator (6 - 1)
where:
F
Generator
= output frequency of the generator
F
Analyzer
= current frequency at the RF input of the R&S FSW
Numerator = multiplication factor for the current analyzer frequency
Denominator = division factor for the current analyzer frequency
F
Offset
= frequency offset for the current analyzer frequency, for example for frequency-
converting measurements or harmonics measurements
The value range for the offset depends on the selected generator. The default setting
is 0
Hz. Offsets other than 0 Hz are indicated by the "FRQ" label in the channel bar
(see also "Displayed Information and Errors" on page 341).
Swept frequency range
The F
Analyzer
values for the calibration sweep start with the start frequency and end with
the stop frequency defined in the "Frequency" settings of the R&S FSW. The resulting
output frequencies ( Result Frequency Start and Result Frequency Stop ) are displayed
in the "External Generator" > "Measurement Configuration" for reference.
If the resulting frequency range exeeds the allowed ranges of the signal generator, an
error message is displayed (see
"Displayed Information and Errors" on page 341) and
the Result Frequency Start and Result Frequency Stop values are corrected to comply
with the range limits.
The calibration sweep nevertheless covers the entire span defined by the R&S FSW;
however, no input is received from the generator outside the generator's defined limits.
Data Input and Output