Rohde & Schwarz FSV3000, User Manual

Page: 378 / 1489

Common measurement settings
R&S
®
FSVA3000/ R&S
®
FSV3000
378 User Manual 1178.8520.02 ─ 08
For a detailed example see Chapter 6.2.4.5, "Measurement example: calibration with
an external generator" , on page 392.
Coupling the frequencies
As described in "Normalization" on page 375, normalized measurement results are
very accurate as long as the same settings are used as for calibration . Although
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
FSV/A 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 FSV/A; the RF
frequency range covers the currently defined span of the R&S FSV/A (unless limi-
ted 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 Analyzer Generator
F
ator Deno
Numerator
F F
  
min
Equation 6-1: Output frequency of the generator
Where:
F
Generator
= output frequency of the generator
F
Analyzer
= current frequency at the RF input of the R&S FSV/A
Numerator = multiplication factor for F
Analyzer
Denominator = division factor for F
Analyzer
F
Offset
= frequency offset for F
Analyzer
, for example for frequency-converting measure-
ments 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 380).
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 FSV/A. The result-
ing output frequencies ( Result Frequency Start and Result Frequency Stop ) are dis-
played in "External Generator" > "Measurement Configuration" for reference.
If the resulting frequency range exceeds the allowed ranges of the signal generator, an
error message is displayed (see
"Displayed information and errors" on page 380) and
Data input and output