25
RPM, manual input
To be able to input markers in the spectrum, the rota-
tional speed must be entered manually.
1. In the
Spectrum
display (A), press
ENTER
.
2. In the display shown next (B), use the
LEFT
/
RIGHT
arrow keys to position the cursor and the
UP
/
DOWN
keys to input RPM. In the spectrum, a red marker
will appear at the RPM frequency entered here (C).
VibChecker accepts up to 60000 RPM.
3. Press
ENTER
to save and return to the
Spectrum
display where the marker can be seen, or press the
BACK
arrow key to return to the
Spectrum
display
without saving RPM or setting a marker.
Adding markers for harmonics
Characteristic for many fault patterns is the presence
of ‘multiples’ or ‘harmonics’, which means that the line
(or group of lines) is repeated two, three or more times
further up in the spectrum. The spacing is a multiple
of the RPM frequency. To display harmonics, up to five
markers (1X, 2X, 3X...) can be input and shown in the
spectrum.
Before using this function, the rotational speed must
be input first (see above). A 1X marker then appears
in the spectrum (if the marker is not visible, zoom out
with the
DOWN
arrow key).
To also input markers at 2X, 3X, etc., press the
ENTER
key once for each additional marker. When the maxi-
mum number of markers have been added, pressing
ENTER
again will remove all of them and a new manual
RPM can be input.
Markers above 1000 Hz will not be displayed; the high-
est of the previous ones (at full zoom) then becomes
the last one in the sequence, and the next
ENTER
press will remove all current markers, even if they are
fewer than five.
A
B
C
1X
marker
D
Markers
(1X-5X)
Summary of Contents for VibChecker
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