BRUEL & KJAER 1615 - Direct Analysis of Vibration

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OOOOOODDDDDDDDDDDDDDOOOODDDDOOOODOOODOOODDDDDDDDDC
l rOel • ICI•r Potent io meter Range~ Rectifi er : RMS Lower lim. Freq.: 20Hz Wr. Sp .. d: 63 mm/s ec. Po per Speed : 10 mmlsec
Measuring
Obj.
Sound
Soectroarom
of
Air Blower
dl:l lbove
2 • 10-'JJ bar
OP112•
- ....
Ze•o level: 30dB
Fig.5.2 Typical Sound spectrogram produced by 1/3 octave analysis
DIRECT ANALYSIS OF VIBRATION
The Type 1614 may be found more useful for vibration spectra because of
the greater frequency range. Otherwise the set-up is similar to the one for
sound spectra, except that the microphone is replaced by an accelerometer
a.1d preamplifier (Fig.5.3). The 2606 scale can be changed to read accelerati-
on directly.
Preamplifier
Ar;ce lerometer
1614 or1615
Filter Set
level Recorder
2305
AQ 0019
Fig.5.3 Set-up for direct analysis of Vibration
169/()J
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