PASCO Specialty & Mfg. CI-6742 Benutzerhandbuch

Motion Sensor II

012-06757B

2

• PASCO CI-6742 Motion Sensor II

• detachable cable with two color-coded phone

plugs

• computer and ScienceWorkshop  500,  700, or

750 Interface

or

• scientific calculator and sensor interface

(Texas Instruments or Casio) and cable

(PASCO part no. 514-06862)

or

• ULI Interface and cable (PASCO part no.

514-06933)

1. Insert the yellow phone plug into digital channel

1 (or 1, 2, or 3 for ScienceWorkshop series 700

and 750 interfaces). Insert the black phone plug

into digital channel 2 (or 2, 3, or 4 for Science

Workshop series 700 and 750 interfaces).

Note:  The Motion Sensor can be connected to

any two adjacent digital channels on the

interface, with the yellow plug in the channel

with the lower number. The yellow plug carries

the transmit signal from  the  ScienceWorkshop

interface to the sensor, and the black plug

carries the return, echo  signal, from the sensor

to the Science Workshop interface.

2. Run the ScienceWorkshop program. In the

Experiment Setup window, set up the

ScienceWorkshop interface and sensor so the

Motion Sensor is connected to the correct

digital channels of the interface.

Note:  You can set up the Motion Sensor II in

ScienceWorkshop program (2.x series) by

dragging the digital plug icon to channel 1 if

the phone plugs are inserted into channels 1

and 2 on the interface box,  or by double-

clicking the Motion Sensor icon in the list of

sensors (3.x series).

Note:  With the 700 and 750 interfaces, two

Motion Sensors may be used at the same time.

3. Set the Narrow/Standard (Std.)  switch based

on your application. For experiments that

involve sensing distances of 2 meters or less

with highly reflective targets (such as a typical

Dynamics Track experiment), set the switch to

Narrow. This setting reduces sensitivity to

false targets near the track and sensitivity to

air track noise. For experiments that involve

longer distances or poorly reflecting targets

(such as match-graph experiments), set the

switch to Std.

Note:  When using the Std. switch setting it may

be necessary to tilt the sensor up 5-10 degrees

to avoid seeing reflections from a table

surface or the front of the housing as a target.

4. For most experiments, the internal calibration

in ScienceWorkshop will be adequate.

However for maximum accuracy the Motion

Sensor II may be calibrated as follows:

a.  Double-click on the Motion Sensor icon to

open the Digital Sensor Setup dialog box.

b.  Aim the Motion Sensor II at a stationary

target one meter away (the default calibration

distance).

c.  Click Calibrate. The Motion Sensor II will

click a few times per second during the

calibration process. The program will

calculate the speed of sound based on the

default calibration distance (one meter) and

the round trip time of the pulses and echoes.

Note:  If the Motion Sensor does not detect a

target, the Interface may stop trying to

calibrate. Should this occur, realign the target

of the sensor and try again.

5.  Change the trigger rate (if necessary) by

clicking the up/down arrows to the right of the

Trigger Rate pop-up menu, or click the pop-

up menu and select the Trigger Rate you

need. (The Trigger Rate may need to be

increased from the default 20 Hz for fast

events like collisions or free-fall experiments

in order to achieve the necessary resolution.)