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The Spectrum Application (RF Measurements)
R&S
®
FPL1000
123
User Manual 1178.3370.02 ─ 11
loss, for instance, a level offset can occur. By defining a known level offset for the mea-
surement, you can shift the x-axis scale to compensate for the loss. Nevertheless, you
define the correct power start level and stop level to be applied to the DUT and swept
by the measurement.
Reference point
By default, the linear trace describing the relation between the output power of the
DUT to the input power is assumed to start at the defined start power level. The start-
ing point is referred to as the reference point for the compression measurement.
1 dB
RF Input
power
Generator
output
power
Linear trace
(Ref 1)
Actual trace
Ref. Point 2
1 dB cp
(Ref 2)
1 dB
1 dB cp
(Ref 1)
Reference
point 1
Linear trace
(Ref 2)
Figure 6-22: Reference point offset
However, you can shift the reference point anywhere within the specified power sweep
range. In this case, the linear trace on which the deviation or compression calculation
is based is also shifted. In the compression measurement results, the used reference
point is also indicated.
6.2.3.2
Power Sweep Compression Point Results
As a result of the compression point measurement, in addition to the power sweep dia-
gram, a result table is displayed.
Measurements and Results