·364·
Operating manual
CNC 8070
20.
SETUP ASSISTANCE
(REF: 1505)
The Bode diagram
Channels
Different ways to display the graph of the obtained data. The selected channels must have
the same units in the abscissa axis, "time" graphs and "frequency" graphs cannot be
displayed at the same time.
•"IN, OUT"
The captured signals themselves. They are "time" graphs; in other words, the scale of
the abscissa axis is given in time units.
• "MAG, PHASE"
Gain and phase after transferring the "In/Out" variables. They are "frequency" graphs;
in other words, the scale of the abscissa axis is given in frequency units (Hz).
• "COHERENCE"
Coherence after transferring the "In/Out" variables. It is a "frequency" graph; in other
words, the scale of the abscissa axis is given in frequency units (Hz).
Captured data.
Except the "Number of averages" field that can always be edited, the rest of the fields can
only be edited by the user when the type of capture is "ADVANCED".
• "FINAL FREQUENCY"
Maximum frequency displayed. It is directly related to the sampling period (1 /
2*SamplingPeriod)).
• "FREQUENCY INCREMENT"
Step between frequencies. It is directly related to the final frequency and the number of
samples (FinalFrequency / NumberOfSamples).
• "SAMPLING PERIOD"
• "NUMBER OF SAMPLES"
• "NUMBER OF AVERAGES"
Number of consecutive captures performed automatically. Each capture involves the
movement of the axis, the application of the PRBS and the capture itself.
Movement
• "FEEDRATE (F/S)"
Moving speed.
• "INITIAL POSITION"
Position where each capture begins.
• "PRBS AMPLITUDE"
Amplitude of the excitation signal.
• ENTRY POINT
It may be used to select the point where to apply the excitation signal, only when the type
of capture is "ADVANCED".
Channel. Meaning.
MAG_AVG
PHASE_AVG
Average of the captures done so far.
MAG_DB
PHASE_DB
Data in decibels.
MAG_OL
PHASE_OL
Data in closed loop to which a mathematical transformation is applied to
represent the open loop system.
It changes the axis moving direction, positive or negative.
It changes the units of the amplitude of the excitation signal.
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