Setting
up Compax3
C3I20T11 / C3I32T11
278
192-120103 N13 C3I20T11 / C3I32T11 December 2010
If you know the value (V(f0)) as well as the phase position (u(f0)) for all
frequencies, the LTI system is completely defined.
Such a graph of value and phase position in dependence of the frequency, is called
frequency response or bode diagram.
=> only LTI systems can be analyzed with the aid of frequency responses.
Frequency response / bode diagram
The frequency response shows the amplification (value) and the phase shift
(phase), which a signal is submitted to when passing through a system.
The displayed bode diagram allows the following conclusions:
If a sine with 60Hz and an amplitude of 1A is present at the input, a sine delayed
by 94° and an amplitude of 0.01m/s will result at the output.
Mechanical system
Frequency response of a mechanic system: Current - velocity of a motor
The outlined course at the end of the measurement range does not permit
statements on the system measured due to disturbances. Due to the attenuation of
the signals increasing with the frequency, the sensitiveness of the measurement to
