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Activity: Operating the EquipmentActivity: Operating the Equipment
MeasurementMeasurement
2-14-2
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Other Things To Do
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í Performing Preliminary Measurements
u Display the light intensity (or voltage) measurement result on
the calculator.
u Keeping the angle of the solar cell panel and optical probe
fixed, turn around until you find the direction where the
displayed value is at its maximum.
u Fix the solar cell panel and the optical probe so they are
pointed in the direction you determined above.
u Display the light intensity (or voltage) measurement result on
the calculator.
u Starting with the solar cell panel facing the ground, slowly
angle it upwards, until you find the angle that produces the
maximum measured value.
í Performing Main Measurements
u Fix the optical probe and solar cell panel so they are pointing in
the direction and at the angle you determined in the preliminary
step, above.
u Set up the EA-200 for long-term measurement, start
measurement, and then set the rain cover in place.
u After measurements are complete, study the correlation between
light intensity and voltage.
í Calculator Operation
u Use the optical probe (or voltage probe) to measure light intensity (or voltage) and display
the results on the calculator.
u Perform the following operation to set up the optical probe and voltage probe for long-
term measurement.
Using E-CON
Using a Calculator Program
Find the applicable program in the Program Library (P.2-16-4), input it into your calculator,
and then run it.
L : Light Intensity
V(V): Voltage
t (s):Time
1 Sun
2 Person Holding Equipment
3 Magnetic Compass
4 Direction of Turn
5 Direction Producing Maximum Value
The best time to perform the preliminary steps is noon. If it is hot or if there is the possibility that
the EA-200 might become too hot, place a shade over the EA-200 to block the sun.
u Consider why there is such a large change in measured values over a 24-hour
period.
u Consider why there are many changes in the graph over a comparatively short
period of time.
u See if the angle of inclination of the solar cell panel and the light intensity satisfy
the expression shown below.
L = L
max
cos(
θ
θ
max
)
L :Light Intensity
L
max
:Maximum Light Intensity Value
θ
(°):Solar Cell Panel Angle of Inclination
θ
max
(°):Angle of Inclination Determined by Preliminary Step
u Predict what changes can be expected throughout the year, and take long-term
(24-hour) measurements during different seasons to see what happens.
1 Sun
2 Ground
3 Zenith
4 Solar Cell Panel Surface
5 Direction of Turn
6 Angle Producing the Maximum Value
m“E-CON”w1(SETUP)c(Advan)
b(Channel)1(CH1)c1(CASIO)b(Volt)c1(LIST) 2w
c2(CH2)c1(CASIO)d(Light)c 1(LIST) 3ww
c(Sample)1(NO)c1(TIMER) 360wc1(NUM) 241ww1(START)
41


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