to establish the height. The drawing in the E-Field Linearization step in Aurea shows the spacer to be
used.
The
Start Measurement
button will trigger the measurement. After pressing the button, a bar will show
the progress of the measurement.
The reference needs to be measured within the next 10s to avoid influences from signal drifts. A down
counter is displayed in the Visualization window. If the reference measurement was not acquired during
these 10s, a pop-up window will be displayed. The measurement needs to be repeated.
Removing the artificial hand and pressing the
Start Measurement
button will trigger the reference
measurement. The measurement table displays the signal level with artificial hand (hand brick), without it
(reference) and the difference between them (Delta).
The measurement process checks if the measured data is valid and if the environment is noisy. When the
data is not valid, it is displayed in red in the measurement table. If the variance of the signal was higher
than ten digits during measurements, the noise indicator in the status bar blinks and Aurea shows a red
message reporting that there was noise detected during the last measurement:
"Measurement variance
exceeded threshold"
. If the Delta is negative, meaning that the reference level was higher than the one
with artificial hand, a red message will be displayed:
"The Delta is negative"
.
The user has to check the measurement setup and repeat the measurement.
Typical reasons for failed measurements are:
•
User activity in the sensing space while measuring
•
PC not grounded
•
Artificial hand not grounded
•
Artificial hand is shaking and the setup was not mechanically stable
•
External noise sources (conducted or irradiated).
Once the E-Field Linearization step is finished, press the
OK
button.
Note:
The collected data corresponds to the Signal Deviation Mean (SDM) of the electrodes signals
levels.
3.2.10
Sensing Area
The Sensing Area parameterization step is intended to adapt the calculated XY position to the real
electrode dimensions of the system. This is done by setting the four scaling parameters
X POS MIN
,
X
POS MAX
,
Y POS MIN
and
Y POS MAX
. The grid of the 2D-position plot in the Visualization window will
be scaled if a slider of these parameters is moved.
Figure 3-11. Sensing Area Hand Path
SOUTH
EAST
WEST
NORTH
Hand Path
MGC3140
Tuning
©
2018 Microchip Technology Inc.
User Guide
DS40002055A-page 18
