Common measurement settings
R&S
®
FSVA3000/ R&S
®
FSV3000
375
User Manual 1178.8520.02 ─ 08
Generator setup files
For each signal generator type to be controlled by the R&S
FSV/A a generator setup
file must be configured and stored on the R&S
FSV/A. The setup file defines the fre-
quency and power ranges supported by the generator, as well as information required
for communication. For the signal generators listed in
"Overview of supported genera-
on page 374, default setup files are provided. If necessary, these files can be edi-
ted or duplicated for varying measurement setups or other instruments.
The existing setup files can be displayed in an editor in read-only mode directly from
the "External Generator" configuration dialog box. From there, they can be edited and
stored under a different name, and are then available on the R&S
FSV/A.
(For details see
"To define a new generator setup file"
Calibration mechanism
A common measurement setup includes a signal generator, a device under test (DUT),
and a signal and spectrum analyzer. Therefore, it is useful to measure the attenuation
or gain caused by the cables and connectors from the signal generator and the signal
analyzer in advance. The known level offsets can then be removed from the measure-
ment results in order to obtain accurate information on the DUT.
Calculating the difference between the currently measured power and a reference
trace is referred to as
calibration
. Thus, the measurement results from the controlled
external generator - including the inherent distortions - can be used as a reference
trace to calibrate the measurement setup.
The inherent frequency and power level distortions can be determined by connecting
the R&S
FSV/A to the signal generator. The R&S
FSV/A sends a predefined list of fre-
quencies to the signal generator (see also
The signal generator then sends a signal with the specified level at each frequency in
the predefined list. The R&S
FSV/A measures the signal and determines the level off-
sets to the expected values.
Saving calibration results
A reference dataset for the calibration results is stored internally as a table of value
pairs (frequency/level), one for each sweep point. The measured offsets can then be
used as calibration factors for subsequent measurement results. The calibration data
can also be stored permanently with the instrument settings using the "Save" function
in the toolbar.
The calibration can be performed using either transmission or reflection measure-
ments. The selected type of measurement used to determine the reference trace is
included in the reference dataset.
Normalization
Once the measurement setup has been calibrated and the reference trace is available,
subsequent measurement results can be corrected according to the calibration factors,
if necessary. This is done by subtracting the reference trace from the measurement
results. This process is referred to as
normalization
and can be activated or deactiva-
ted as required. If normalization is activated, "NOR" is displayed in the channel bar,
Data input and output
