Measurement Of Frequency Responses - Parker Compax3 Series Operating Instructions Manual

Setting up Compax3
4.3.9.6
Basic structure of a frequency response measurement
Signal
Generator
Superimposed
überlagertes
System
258

Measurement of frequency responses

In this chapter you can read about:
Safety instructions concerning the frequency response measurement ........................... 258
Functionality of the measurement.................................................................................... 258
Open/Closed Loop frequency response measurement ................................................... 260
Excitation Signal .............................................................................................................. 261
Non-linearities and their effects ....................................................................................... 262
Please note that you require a licence hey (see page 250, see page 248) for
Safety instructions concerning the frequency response measurement
During the measurement of the frequency response, the control is changed and
influenced in multiple ways. You should therefore respect the following notes:
During the measurement, the entire system is excited via a broad frequency
spectrum. This might damage especially sensitive components (such as lenses)
The risk increases with the extent of the excitation. In addition, natural mechani-
cal frequencies may cause an increased excitation of individual components.
The measurement of the frequency response can only be made in the setup
mode with energized controller.
During the current measurement (between start and stop of the measurement),
no write flash may be executed.
In the event of a break in communication during the measurement, the controller
must be switched off and then on again in order to reestablish the original status.
Changes of the controller parameters during the measurement are not permitted.
Those may be overwritten by standard values when the measurement is termina-
ted.
Functionality of the measurement
Signal Processing
Signalauswertung
+
Input
Eingangs
open/closed
Signal u(t)
Loop
192-120114 N5 C3I22T11 June 2008
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C3 Software-
Oscilloscope
System S
G(S) Output
Ausgangs
Signal y(t)
C3I22T11
V(f)
Amplitude spectrum
Aplitudenspektrum
ϕ(f)
Phase spectrum
Phasenspektrum