11.2.3 Logging of FFT spectra – Logging
Spectra can be logged in a logger file with two steps: Integration Period step
and/or Logger Step.
For logging FFT spectra, the Logger position must be enabled in the Logger
Setup screen (path: <Menu> / Measurement / Logging / Logger Setup).
If you wish to save spectra together with Summary results, you must enable
the Summary Results position. FFT spectra will be then logged with the
Integration Period step.
The instrument allows additional logging of FFT spectra in a logger file with the
Logger Step.
For this, you should enable logging of spectra switching on the FFT position in
the Logger Results screen (path: <Menu> / Measurement / Logging /
Logger Results).
11.2.4 Setting FFT analysis parameters – FFT
The FFT position, which appears in the
Measurement section after activating the FFT
function, opens the screen in which you can
select parameters of the FFT analysis:
frequency band (Band), pre-weighting filter
(Filter), weighting window (Window), number
of lines (Lines) and averaging type
(Averaging).
The Band parameter defines the band for the FFT analysis performance: 40kHz, 20kHz, 10kHz, 5 kHz, 2.5kHz,
1.25kHz, 625Hz, 312Hz, 156Hz or 78Hz.
Weighting filter
For the sound analysis, the following pre-weighting filters are available:
• Z – class 1 according to IEC 61672-1:2013,
• A – class 1 according to IEC 651 and IEC 61672-1:2013,
• C – class 1 according to IEC 651 and IEC 61672-1:2013,
• B – class 1 according to IEC 651,
• U – class 1 according to IEC 61012:1990,
• AU – class 1 according to IEC 61012:1990,
• HP – high-pass filter.
For the analysis of vibration signals with the band up to 20kHz:
• HP – high-pass filter,
For the analysis of vibration signals with the 40kHz band:
• HPE – ultra band filter.
Characteristics of filters are given in Appendix C.
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