Common Measurement Settings
R&S
®
FSW
338
User Manual 1173.9411.02 ─ 19
zation is activated, the offsets in the reference trace are removed from the current
measurement results to compensate for the inherent distortions.
Reference line
The reference line is defined by the
and
in the
"External Generator" > "Source Calibration" settings. It is similar to the
defined in the "Amplitude" settings. However, as opposed to the reference
level
,
this reference
line
only affects the y-axis scaling in the diagram, it has no effect on the
expected input power level or the hardware settings.
The reference line determines the range and the scaling of the y-axis, just as the refer-
ence level does.
The normalized reference trace (0
dB directly after calibration) is displayed on this ref-
erence line, indicated by a red line in the diagram. By default, the reference line is dis-
played at the top of the diagram. If you shift the reference line, the normalized trace is
shifted, as well.
Shifting the reference line (and normalized trace)
You can shift the reference line - and thus the normalized trace - in the result display
by changing the
.
Fig. 6-6: Shifted reference line
If the DUT inserts a gain or an attenuation in the measurement, this effect can be
reflected in the result display on the R&S
FSW. To reflect a power offset in the mea-
surement trace, change the
chapter 6.2.4.5, "Measurement Example: Calibration with
Coupling the Frequencies
As described in
on page 336, normalized measurement results are
very accurate
as long as the same settings are used as for calibration
. Although
Data Input and Output
