NeuLog NUL-213 Guia página 19

For best results
The NUL-213 motion sensor has a working range
between 0.15 to 2 meters (short range) or 0.2 to 10 m
(long range); results may be inconsistent outside of this
range. Ultrasonic waves emitted from the sensor spread
out in a cone pattern at about 15° around the point of
reference.
 If possible, attach the sensor to something stable to
avoid movements which can give skewed readings.
 If you get poor readings, another object in the
foreground or background within the cone may be
reflecting the ultrasonic waves adding noise to the
experiment.
 Use objects which are at least 10 cm x 10 cm when
tracking specific targets.
 For smaller targets, we recommend starting the
object closer to the sensor; for larger objects we
recommend starting farther away.
 When testing in areas with many hard surfaces, the
waves may bounce around and create extra noise for
the detector. This can cause irregular graphs. To
reduce the noise level, try covering some of the
surrounding surfaces with a soft material to dampen
sound such as cloth or foam.
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