The Spectrum Application (RF Measurements)
R&S
®
FPL1000
286
User Manual 1178.3370.02 ─ 09
For details on determining compression points, see
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 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 internal gen-
erator - 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 enabling the
use of the internal generator as a tracking generator. The analyzer sends a predefined
list of frequencies to the internal generator. The frequency list for the calibration sweep
contains 201 values by default, divided in equidistant frequencies between the analyz-
er's start and stop frequency. The internal generator then sends a signal with the speci-
fied level at each frequency in the predefined list. The analyzer measures the signal
and determines the level offsets 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 can be performed using either transmission or reflection measure-
ments. For power sweeps, only transmission measurements are supported. The
Receiving Data Input and Providing Data Output
