Commtest Instruments vb Series Instrument Reference Manual page 52

The only parameter you need to set is the Fmax value. This can be
done in two ways:
OR
•
•
Once the Fmax is set, select the machine, point and
direction in which the sequence of measurements will be
stored.
Recommendations
A large number of recordings will be created so we recommended
you create a new 'point' for each new coast-down or run-up
measurement to clearly separate each set of recordings.
For machines with a slow coast down or run up, e.g. more than one
minute, we recommend that you add a few seconds extra delay
between recordings (press
required).
The use of a tachometer is also recommended but not essential. It
obtains an RPM reading for every measurement, which aids
interpretation.
Taking a measurement
•
Press
•
After the first spectrum has been recorded, switch off the
machine (or begin ramping its speed up or down).
•
Once the machine has stopped rotating (or its speed has
been fully adjusted) press
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Press to display the Machine Running Speed Menu
then use the number keys to enter an RPM value. The
Fmax will be set to 10 x the RPM (or rounded up to the
closest value).
Press to display the Set Fmax Menu and use
to select a value.
to begin the recording sequence.
Section 3: Onsite Analysis - Measurement Menu
then enter the number of seconds
or
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