Frequency-Dependent Precorrection - R&S N 8000 Series System Manual

Fig. 4 Typical curve with both phase and amplitude precorrection switched on
4. Optimize the shoulder distance using all interpolation points again, in particular by shift-
ing the interpolation point at 100%.
Keep carrying out phase precorrection and amplitude precorrection alternately until no fur-
ther improvement can be obtained.
Further interpolation points can be added for an optimum precorrection. The recommended
Note
number is four to a maximum of six interpolation points (including the interpolation points at
0% and 100%).
4.3.3.4

Frequency-Dependent Precorrection

Background
The FreqCorrection control panel can be used to influence the characteristic by means of
an amplitude and/or phase frequency response, the effect of which is dependent on the lev-
el.
A set frequency response is applied to all signal components having a level greater than
the selected threshold. On the other hand lesser signal components are unaffected.
An amplitude frequency response (Amplitude Slope Amplitude 1/2 or Amplitude Slope
Phase 1/2) and a phase frequency response (Phase Slope Amplitude 1/2 or Phase Slope
Phase 1/2) can be applied to the amplitude characteristic and the phase characteristic in-
dependently of one another. Two independent thresholds are available (Position Point 1
or Position Point 2). The position of the thresholds (1 or 2) and their effect (A or P) are
symbolically represented in the graphic.
2098.0188.72
Chapter 4
- 4.37 -
Commissioning
E-1