© PCE Instruments
56
For vibration velocity, only the setting
dF
0.5 Hz with a max. frequency of 976 Hz is possible. The
different frequency ranges can be changed with the arrow keys
UP
and
DOWN
.
Fig. 41 FFT screen
Two spectra are shown in the display. The upper spectrum shows an overall view in which the
2048 FFT lines are averaged. The frequency range is displayed below the graph.
The lower spectrum
Zoom
shows the FFT lines without averaging. Due to the screen resolution,
only one section of the entire spectrum can be displayed at a time. The section displayed in the
zoom view is represented in the overall view by an orange rectangle and the current frequency
range is displayed below the spectrum as in the overall view.
Above the overall view, the measured value and the frequency of the FFT line with the highest
amplitude are displayed in green font. In addition, the maximum in both spectra is shown as a
green line.
The cursor is operated with the
LEFT
/ RIGHT
arrow keys. This displays the amplitude and
frequency of the selected FFT line in orange font colour above the zoom view. In the two spectra,
the current cursor position is represented by an orange dashed line.
With the help of the
HOLD
key, the current spectrum can be held. This is indicated by the
message
HOLD
in the overall view at the top right. Pressing it again leads back to the live
measurement.
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Summary of Contents for VT 3800
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