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8.5.4 Avg Mode
The Averaging Mode can be chosen from several choices:
•
RMS Averaging
The noise floor is not reduced because RMS averaging averages the power of the signal.
RMS Averaging is the most common type.
•
Peak-Hold
Peak hold averaging is performed at each frequency line separately, retaining peak levels
from one FFT record to the next.
Note:
All the FFT calculations are performed on the PC. The raw time-signals are transferred from
the instrument to the PC, where the FFT and averaging calculations are performed.
8.5.5 Scale
The power spectra can be displayed in g or m/s
scale can be chosen linear or dB. Changing the scale does not restart the averaging It just displays the
same data in a different scale.
8.5.6 Cursor, Zoom and Pan
A cursor can be used to precisely measure the frequency and amplitude of a particular spectral point. In
order to use the cursor proceed as follows:
•
Press on the button that looks like a cross (see
•
Place the mouse over the point where the X and Y cursor lines meet and left-click. This grabs
the cursor.
•
Drag the cursor to the spectrum curve and frequency of interest. The cursor can jump from
one curve to the other.
•
Read the X and Y values in the cursor field underneath the graph.
Zooming and Panning is done the same way as in the Records graphs. See section
The auto-scale button can be pressed or released to obtain an automatic or fixed scale. When the
graph is in fixed scale, writing directly in the values of the end-scale markers sets the scale to fit those
values, in the X as well as Y scales.
8.6
Static Tab
The static tab is seen in
This can be used to verify the calibration. When a particular axis is vertical and the instrument is not
moving, the measured static acceleration along that axis should be precisely 1g.
The static tab also shows a graphic depiction of the instrument's inclination, as well as the tilt angles
around the X and Y axes.
WiFi
8.7
Tab
The WiFi tab has all the indicators showing the instrument's present state of connection, as well as
controls to configure WiFi™and email settings.
User's Manual
RMS averaging reduces signal fluctuations but not the noise floor.
Peak hold averaging retains the peak levels of the measured spectra.
2
Figure
12. It displays the measured static acceleration along the three axes.
scale for acceleration, and in m/s for velocity. The
Figure
11(1))
Graph
Controls.
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