Section 3: Onsite Analysis - Measurement Menu
60
Frequency Unit
Available units are Hz and CPM/kCPM. The frequency unit Hz,
is equivalent to ‘cycles per second’ and kCPM stands for
‘kilocycles per minute’.
Amplitude Scale
Either linear or log scale can be chosen for the bottom axis.
The linear amplitude scale can be used in most cases. The log
scale (base 10) is more useful for displaying vibration with both
very large and very small amplitudes. If the log scale is
selected, the log range (the range of the amplitude axis) will
appear as option 6 in this menu.
Amplitude Type
Applies to the chart scale for the left axis. For spectra this can
be set to rms, Ø-peak or peak-peak. The Ø-peak and peak-
peak values are 'derived' from the rms value. Ø-peak is
calculated by multiplying the rms value by 1.414. Peak-peak is
calculated by multiplying the rms value by 2.828. For time
waveforms the amplitude type is always Ø-peak.
Velocity Unit
(Also acceleration unit, displacement unit and current unit -
Amps only) Available SI and imperial options are: velocity -
mm/s, in/s; acceleration - g, m/s
2
; displacement - mm, µm, mil.
If the Amplitude Scale is set to Log, the options VdB and AdB
are also available. The vibration velocity level (VdB) is defined
as 20 times the logarithm of the ratio of the rms velocity level to
a reference velocity value, the VdB reference. Acceleration
expressed in AdB is defined as 20 times the logarithm of the
ratio of the rms acceleration level to 1 µg rms.
VdB Reference
See above. The value 1e-6 mm/s is an abbreviation for 1x10-6
mm/s and is the SI reference level. The value 1e-5 mm/s is the
reference level used by the US Navy and many American
industries.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
Need help?
General
