29
User Manual
o
Type
–
informative description of the sensor.
o
Unit
–
unit of measurement to display in the graphs of the demodulated signal (e.g.
“g” for accelerometers)
.
o
Add
–
Allows to add new sensors to the list. It allows to define a sensor and its main
parameters but not to set its cavity size. The cavity size must be set in the
“
Sensor
select”
window as described in the previous section.
o
Filtering
–
Allows to enable the High-pass filter function integrated in the DeltaSens
unit. Such function can be turned ON or OFF for each sensor individually. The cut-off
frequency of the HP filter can be set with the “Cutoff frequency (Hz)” control located
at the bottom of the sensor list. Unlike the filters available on the mouse-over menu of
the “Home” and “ASD” panel
s, the HP filter function also affects the recorded data.
o
Autozero
–
Allows to enable the Autozero function integrated in the DeltaSens unit. In
case of strong solicitation of the sensor (out of the dynamic range) the DeltaSens
decoding system could reinitiate the signal acquisition with an unwanted offset. The
Autozero function allows to avoid signal saturation caused by the multiple offsets
accumulated during the measurements. If the signal reaches a certain percentage of
the maximum dynamic range, the Autozero function will re-center automatically the
sensor signal around 0. The threshold that triggers the Autozero function can be set
by the user
using the control “Autozero threshold (%)”.
The Autozero function is
triggered only when the signal falls over such threshold for longer than a given
timespan which can be set by the user using the control “Autozero duration (ms)”.
This
function can be turned ON or OFF for each sensor individually. The Autozero function
also affects the recorded data and the analog outputs associated to the sensors for
which the function is switched ON.
o
Apply
–
Allow to save the changes. After pressing apply,
the “Save”
button on the
bottom
right of the “Settings” panel
must be pressed as well to upload the changes
to the DeltaSens unit.
o
Compensate phase offset
–
This button is used to remove unwanted offset from the
sensor signal. The moment the button is pressed, the chosen sensor signal will be reset
to zero. This compensation affects the general phase signal and therefore also the
analog outputs assigned to the sensor just reset.
o
Autozero enable
–
Allows to enable or disable the Autozero function for all the
demodulated signals. Note that if the “Autozero enable” switch is turned OFF, the
Autozero function will not be applied to any of the demodulated signals, even if the
“Autozero” option was selected for a specific sensor.
o
Autozero threshold (%)
–
Allows to set the threshold that triggers the Autozero
function.
