Setting The Fmax - Commtest Instruments vb Series Instrument Reference Manual

Setting the Fmax

The Fmax is the maximum frequency displayed on the spectrum i.e.
the frequency range, starting from zero, over which vibration
amplitudes are displayed. The unit Hz is equivalent to cycles per
second (1 Hz = 60 cycles per minute).
•
From the Set Parameters Menu press
Fmax Menu.
•
Press
horizontally across the columns.
In general the higher the operating speed of the machine, the higher
the Fmax needs to be to capture all crucial information. For vibration
involving fingered elements such as gear teeth, fan blades, pump
vanes, and bearing elements, an Fmax equal to 3 times the number
of fingers multiplied by the operating speed is usually sufficient. For
vibration not involving fingered elements, an Fmax equal to 10 times
the operating speed is usually sufficient. You can calculate the Fmax
yourself or the instrument can do it for you.
68 Section 4: Manual Setup Measurement Parameters
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or to highlight a frequency maximum and
to select. You can also press
to display the Set
or to move