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111
SVAN 979 User Manual
11
FFT ANALYSER
The instrument operates as the FFT
analyser in a very similar way to the Level Meter. Moreover, the FFT
analysis is performed in parallel with the SLM or VLM
measurements.
Results of the FFT
analysis (spectra) measured with preselected frequency
weighting filter and window, are presented in the
Spectrum
view.
The read-out of spectrum values can be done with a vertical cursor.
11.1 S
ELECTING
FFT
FUNCTION
To select the
FFT
analysis function, open
the
Measurement Function
screen, select
the
FFT
position and press
<ENTER>
.
<ENT>
Note: It is not possible to change the current function during a running measurement.
In this case, the instrument displays for about 2 seconds the message:
“Measurement in Progress”.
To change the current function, the measurement must be stopped!
11.2 C
ONFIGURING
FFT
ANALYSER
Execution of the FFT
analysis depends on a certain number of the parameters, configured in the
Measurement
section.
11.2.1
General measurement settings of FFT analysis
– General Settings
FFT spectra are averaged during
Integration Period
and saved as
Summary Results the number of times specified by the
Repetition Cycles
parameter.
The
Integration Period
and
Repetition Cycles
parameters are defined in the
General Settings
list.
11.2.2
Selecting measurement range for FFT analysis
– Range
The input range for the
FFT
function can be
selected in the
Range
screen:
Low
or
High
.
Depending on the settings of the
Scale
parameter (
path: <Menu> / Display /
Display Scale
) the range for a vibration
signal can be presented in absolute or
logarithmic units (dB).
►
The values of ranges in sound modes depend on the settings made in the
Compensation Filer
screen (
path:
<Menu> / Measurement / Compensation Filter
).
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