Technical data are subject to change without notice.
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Vibration severity measurement
A VIB measurement returns the RMS value of vibration velocity in mm/s (or inch/s). As input data
you set the ISO machine class with the UP/DOWN keys.
Pressing SET brings you to a menu where you can define a spectrum reading, see next page. The M
key start a reading.
The evaluation consists of a comparison of the measured value with the ISO limit values recom-
mended for the different classes. An arrow points at the condition scale. If no class is input, the
arrow is not shown.
The majority of industrial machinery belongs to the vibration classes 1 - 4:
Class 1: Electrical motors of up to 15 kW
Class 2: Medium size machines without special foundations
Class 3: Large machines on rigid foundations
Class 4: Large machines on soft foundations.
For example, most smaller process pumps in a chemical plant would be Class 2. A 100 kW fan on a
concrete foundation would be Class 3. However, the same fan fastened to the less rigid metal deck
of a ship could be considered as Class 4.
Classes 5 and 6 are used for heavy reciprocating prime movers and machines which are intended
to vibrate, such as vibrating screens (see page 45).
On the instrument, the ISO values for good and acceptable are shown as green. Just tolerable is
yellow, unacceptable is red.
VIB
ISO 10816
Class 2 2.76
mm /s
Vibration severity
Condition:
red
yellow
green
Machine class 1 to 6
according to ISO (VDI, BS)
Change class
Limits Class Class Class Class
To setup menu
Measure
SET
M
Measuring vibration 47
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