Motion Sensor II
012-06757B
4
Limited Warranty
PASCO scientific warrants the product to be free from
defects in materials and workmanship for a period of
one year from the date of shipment to the customer.
PASCO will repair or replace, at its option, any part of
the product which is deemed to be defective in
material or workmanship. The warranty does not
cover damage to the product caused by abuse or
improper use. Determination of whether a product
failure is the result of a manufacturing defect or
improper use by the customer shall be made solely
by PASCO scientific. Responsibility for the return of
equipment for warranty repair belongs to the
customer. Equipment must be properly packed to
prevent damage and shipped postage or freight
prepaid. (Damage caused by improper packing of the
equipment for return shipment will not be covered by
the warranty.) Shipping costs for returning the
equipment after repair will be paid by PASCO
scientific.
Address:
PASCO scientific
10101 Foothills Blvd.
Roseville, CA 95747-7100
Phone:
(916) 786-3800
FAX:
(916) 786-8905
e-mail:
web:
www.pasco.com
Theory of Operation
When triggered, the module produces a burst of 16
pulses at a frequency of about 49 KHz. This
produces an audible click from the electrostatic
transducer which functions as both a speaker and a
microphone. The time between the trigger rising
edge and the echo rising edge is proportional to the
distance. The trip time for sound in air is about 0.3
ms/m, so an object at a distance of 0.6 m produces a
round-trip time delay of 3.6 ms. The sound intensity
decreases with distance, and for a round trip the
attenuation can be large enough for the receiver to
miss the echo. Therefore the gain of the receiver’s
amplifier is increased in discrete amounts in 11 steps
where the maximum gain is reached in 38 ms. This
increases the usable distance to about 8 meters with
a highly reflective target. Operating the receiver at
reduced gain at the beginning of the cycle reduces
the circuit’s sensitivity to false echoes.
Operation with CBL and EA-100 systems
An accessory cable (available separately, PASCO
part no. 514-06862) is required for operation of the
Motion Sensor II with a Texas Instruments CBL
System
™
or a Casio EA-100 Data Analyzer
™
.
An accessory cable (available separately, PASCO
part no. 514-06933) is required for operation of the
Motion Sensor II with a ULI interface.
Note: This instruction sheet was written
assuming that the user is familiar with
ScienceWorkshop. Users can gain
familiarity by working through the tutorials
provided with ScienceWorkshop.
Note: This equipment has been tested and found to
comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against
harmful interference in a residential installation. This
equipment generates, uses and can radiate radio
Motion Sensor II CI-6742
Tested To Comply
With FCC Standards
FOR HOME OR OFFICE USE
frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful
interference to radio communications. However, there
is no guarantee that interference will not occur in a
particular installation. If this equipment does cause
harmful interference to radio or television reception,
which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the
interference by one or more of the following
measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and
receiver.
- Connect the equipment into an outlet on a circuit
different from that to which the receiver is
connected.
- Consult the dealer or an experienced radio/ TV
technician for help
.
