Download dBBati 4.1 User Manual

DBBATI32 SOFTWARE SUITE:
USER MANUAL
The threshold search command (command
Study / Threshold /
Search) allows the user to define the level of the threshold (value
given in physical unit) and a slope (positive or negative) to the
threshold condition.
When the threshold condition has been fulfilled, the cursor is located at
the threshold exceedance on the graphical view.
allows the user to stop the threshold search and the command
The command
next threshold exceedance.
allows the user to find the
The horizontal toolbar allows the user to define display parameters of the graphical view. It is possible to use zoom
functions to zoom a part of the signal and perform an autoscale for the zoom view.
The display units depend of the type of graphical view.
For signals, it is possible to select the following display units:
ƒ
ADC : Displays the dynamic in dB converter. It’s a relative decibel level. The 0dB level is the full-scale value
of the converters (i.e. a sample which has a numerical value of 2 16 (32767) corresponds to the 0dB value).
dBADC values are always negative between 0 and -90dB.
ƒ
ƒ
V : Dynamic display in Volts.
Physical unit : If the transducer is a microphone, he dynamic is displayed in Pascals (Pa), If the
transducer is an accelerometer, the dynamic is displayed in Acceleration (m/s²).
For sound and vibration quantities of type autospectrum, cross-spectrum and transfer functions, it is possible to
select the following display units:
ƒ
ƒ
ƒ
dB : Level in decibels of the considered quantity (Leq, Slow, Fast, Impulse, etc…)
RMS (Root Mean Square) : Average quadrate value for all the instantaneous squared values expressed in
physical units.
PWR (Power) : The power represents the average of a squared value. It is the unit used to determine the
power at a given frequency for a determined (sinusoidal) signal. It is expressed in squared units
It is possible to display up to two signals on the same graphical view if the data items have the same characteristics
(periods, duration).
CHAPTER 15 -MANAGEMENT OF MEASUREMENT SESSION DATAFILES (CMG)
PAGE 89