Casio fx-7400G PLUS User Manual Page 12

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fx-7400G Plus
20 Discovering Algebra Calculator Notes for the Casio fx-7400G Plus ©2008 Key Curriculum Press
Note 1I Reading a Distance Using the EA-100 or EA-200
To read a distance, you will need a Casio EA-100 or EA-200 Data Analyzer,
an Ultrasonic Motion Sensor (distance probe), and a meterstick or meter
tape. Your EA-100 or EA-200 does not need to be connected to a calculator to
measure distance.
a. Connect your EA-100 or EA-200 to a distance probe from the sonic
port on the right side of the EA-100 or EA-200.
b. Turn on the EA-100 or EA-200.
c. Press until the EA-100 or EA-200 begins flashing
SAMPLING
and DONE alternately. Your EA-100 or EA-200 is now ready to
measure in the multimeter mode.
d. Push the button several times until the EA-100 or EA-200
display indicates
SONIC M.
You should see the distance probes blinking red light and hear it clicking as
it samples measurements (in meters) to the nearest object in front of it. As
you point the distance probe at various objects, your EA-100 or EA-200 will
display the distances to the nearest object in meters. Shown here is a reading
of an object that is 3.14 meters from the probe.
e. Use your meterstick (tape) and hold the distance probe so the front
of the probe is exactly 1 meter from the wall, then take a reading.
Determine whether the distance is measured to the front, middle, or
back of the probe. This knowledge is important for accurate length
measurements. You will need to repeat this step if you change
equipment, because not all devices work the same.
Errors
If you do not get a reading, check to make sure the distance probe is
completely plugged into the port marked SONIC and that the link cable
is securely connected.
Note 1J Equations
To graph an equation on your calculator, the equation must be in the form
y “some expression. If the equation contains variables other than x and y,
you need to rewrite it using only x and y as variables.
a. Press and select
GRAPH.
b. Enter the equation using the variable x. Press to enter the
variable x. Press to store the equation in
Y1.
c. Setting a window for graphing equations is not as easy as setting a
window for data. If it is an application problem, think about what
values make sense for both x and y. You may need to try different
windows to find one that is appropriate. To set the view window,
EXE
,
MENU
CH-View
MODE
To distance
probe
(continued)
DA2_FX7400G_01.qxd 2/14/07 3:55 PM Page 20
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