The Spectrum Application (RF Measurements)
R&S
®
FPL1000
288
User Manual 1178.3370.02 ─ 09
reflect an attenuation or gain caused by the measured DUT (see also
erence line (and normalized trace)"
Restoring the calibration settings
If the measurement settings no longer match the instrument settings with which the
calibration was performed (indicated by the "APX" or no label next to "Trk.Gen" in the
channel bar), you can restore the calibration settings, which are stored with the refer-
ence dataset on the R&S
FPL1000.
Storing the normalized reference trace as a transducer factor
The (inverse) normalized reference trace can also be stored as a
transducer factor
for
use in other R&S
FPL1000 applications that do not support the use of the tracking gen-
erator. The normalized trace data is converted to a transducer with unit dB and stored
in a file with the specified name and the suffix
.tdf
under
C:\ProgramData\Rohde-Schwarz\ZNL-FPL\trd
. The frequency points are allo-
cated in equidistant steps between the start and stop frequency.
Defining transducer factors are useful, for example, to determine the effects of a partic-
ular device component and then remove these effects from a subsequent measure-
ment which includes this component.
For an example, see
"How to Remove the Effects of a Particular Component from
Measurement Results Using Calibration"
Note that the
normalized
measurement data is stored, not the original
reference
trace!
Thus, if you store the normalized trace directly after calibration, without changing any
settings, the transducer factor is 0
dB for the entire span (by definition of the normal-
ized trace).
Reference Trace, Reference Line and Reference Level
Reference trace
The calibration results are stored internally on the R&S
FPL1000 as a
reference trace
.
For each measured sweep point, the offset to the expected values is determined. If
normalization is activated, the offsets in the reference trace are removed from the cur-
rent measurement results to compensate for the inherent distortions.
Reference line
The reference line is defined by the
and
in the
"Internal 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.
Receiving Data Input and Providing Data Output
