Adva
nc
ed
T
op
ic
s
33
Press
$OK#
to return to the dialog box with the changes shown (Figure 4-8). Press
$OK#
to exit the dialog box and activate the changes. Figure 4-9 shows the
Numeric
view
with the new units.
Calibration
Many Fourier
®
sensors are factory-calibrated and should not need user
calibration. However, most of those that do require user calibration have an
adjustment screw on the sensor itself for hardware calibration. Please refer to the
documentation that comes with each sensor to determine its calibration status.
If a sensor requires calibration and no hardware calibration is available, the
software calibration may be done in the StreamSmart Aplet. Software calibration
has two limitations. First, it is the software being calibrated, not the sensor, which
means that the new calibration settings will not be carried over if the sensor is
plugged into a different calculator. Second, since the calibration is in the software,
it will be applied to all sensors of that same type. The StreamSmart Aplet cannot
distinguish between two sensors of the same type.
Once it has been determined that software calibration for a sensor is the only
option, it should be noted that the StreamSmart 400 offers both 1-point and 2-point
methods for such calibrations. A 1-point calibration simply changes the offset,
while a 2-point calibration changes both offset and slope.
To perform a calibration:
1.
Press
S
to view the sensor readings numerically. In Figure 4-10, suppose
the current reading of the low-G accelerometer is incorrect, and the correct
reading is
-6.433
.
2.
Given that the current reading is not correct and the correct reading is
known, press
V
and select the
Calibrate
option (see Figure 4-11).
Figure 4-8
Figure 4-9
