Parker EME
Setting up Compax3
192-120101 N11 C3I11T11 November 2007
209
Attenuation of the excitation amplitude
Signal amplitude too small => no non-linearity in the signal range
Signals
Spectrum
Output
Signal
Input
Signal
System
Input Signal
Output Signal
Input Signal
Output Signal
The signal range is reduced so that approximately linear conditions are valid. The
results of the measurement will then display the dynamic behavior at the working
point.
Example cam drive:
If the drive moves considerably (e.g. 180°) during the measurement, the behavior
of the system will change greatly over this range => caused by non-linearities in the
signal range.
An inexact measurement is the result.
If the excitation is reduced so that the drive will move only by a few degrees, the
behavior of the system at this working point will be approximately constant.
An exact measurement is the result.
Shifting the working point into a linear range
Signal amplitude large with offset => no non-linearity in the signal range
Spectrum
O
utput Si
gna
l
Input Signal
System
Signals
O
ffs
et
Offset
Input Signal
Output Signal
Input Signal
Output Signal
For this, the signal range is shifted so that approximately linear conditions are valid
=> the results of the measurement show the dynamic behavior at the working point.
