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SVANTEK 977W User Manual
11.2. Setting the 1/1 Octave or 1/3 Octave analyser
Execution of
1/1 Octave
or
1/3 Octave
analysis depends on a certain number of parameters, which can be set
in the different windows of the
Measurement
list.
The
1/1 Octave
or
1/3 Octave
analysis is performed based on the parameters
selected in the
General Settings
list of
Measurement
menu:
Integration
Period
and
Repetition Cycles
.
The spectra are stored as main results in a results file with the same step
(
Integr. Period
) as the other main results, measured by the
Level Meter
function.
The user can switch on or off the history of spectra recording in the logger file
(
path: <Menu> / Measurement / Logging / Logger Results / Spectrum:
). If
spectra history is switched on, the spectra will be logged also with the step,
defined by the
Logger Step
parameter (
path: <Menu> / Measurement /
Logging / Logger Setup / Logger Step
).
For each octave or one-third octave band the RMS result is calculated and presented as a bar on the spectrum
plot.
Besides the RMS results for the bands three
Total
values are measured and displayed as an additional three
bars. Parameters for Total (filters) are set by default and can not be changed.
The output of the selected octave or third-octave band result can also be used to trigger an alarm, saving logger
results, recording time history signal and the event.
11.2.1. Setting the measurement range for 1/1 Octave and 1/3 Octave - Range
For the
1/1 Octave
or
1/3 Octave
functions
the user can select the input ranges
specified in Appendix C, named as
Low
and
High
.
The selection of the input range is doing in
the
Range
window of the
Measurement
list.
►
Note: The calibration factor is always added to the range limits.
For example, if calibration factor is equal to 0.5 dB, the range will
be changed automatically (lower and upper limits will be increased
by 0.5).
