Technical data are subject to change without notice.
© Copyright SPM 2002-04. 71650.B
SPM Instrument AB • Box 504 • S-645 25 Strängnäs • Sweden
Tel +46 152 225 00 • Fax +46 152 15075 • info@spminstrument.se • www.spminstrument.se
RMS mm/s 2.7
RMS 200 Hz 2.5
1 62.5 Hz 1.3
2 123.0 Hz 0.63
Analysis On
Hz / cpm: Hz
Frequency 3 – 5000
Lines 400
VIB Set display
Spectrum lines
Open to set
transducer sensitivity
Hz = Hertz, cycles per second
cpm = cycles per minute
Hz • 60 = cpm
Select range, from 3 to
200, 500, 1000, 2000, or 5000 Hz
Toggle between 400 and 800
Recording a vibration spectrum [Expert]
The SET key opens a menu where you can define parameters for recording a vibration spectrum.
For this, set the line Analysis to On.
You can toggle Hz and cpm on line 3, even after the reading has been taken (but before you leave
the measuring mode). Cpm means cycles per minute and is similar to the rpm (revolutions per
minute) in which the machine speed is measured. This makes it easy to compare the displayed
spectrum lines with the machine speed. In case of unbalance, the spectrum line at the top should
correspond to the rpm of the machine.
You can select one of five frequency ranges, 200, 500, 1000, 2000, or 5000 Hz. The most significant
range depends on the machine's rotational speed and vibration behaviour. A narrow frequency
band gives you a better resolution.
The instrument performs an FFT (Fast Fourier Transformation). On line 1, it displays the overall
vibration severity value (as for VIB), on line 2, the RMS velocity value for the selected range. The
following lines show the value at each of 15 frequency lines (in mm/s or inch/s). The frequency can
be toggled between Hz and cpm. The lines are sorted by vibration value, with the highest at the
top of the list. Use the UP/DOWN keys to scroll.
In data logger mode, you actually save up to 200 lines and transfer them to Condmaster
®
Pro. There
you can use the EVAM functions for graphical spectrum displays and machine fault identification.
Scroll
15 lines displayed, up to
200 lines to Condmaster
®
Pro
in data logger mode
50 Measuring vibration
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