Activity: Operating the Equipment

￿Performing Preliminary Measurements

uDisplay the light intensity (or voltage) measurement result on the calculator.

uKeeping 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.

1Sun

2Person Holding Equipment

3Magnetic Compass

4Direction of Turn

5Direction Producing Maximum Value

uFix the solar cell panel and the optical probe so they are pointed in the direction you determined above.

uDisplay the light intensity (or voltage) measurement result on the calculator.

uStarting with the solar cell panel facing the ground, slowly angle it upwards, until you find the angle that produces the maximum measured value.

1Sun

2Ground

3Zenith

4Solar Cell Panel Surface

5Direction of Turn

6Angle Producing the Maximum Value

￿Performing Main Measurements

uFix 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.

uAfter measurements are complete, study the correlation between light intensity and voltage.

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.

2-14-2

English

Measurementasurement

￿Calculator Operation

uUse the optical probe (or voltage probe) to measure light intensity (or voltage) and display the results on the calculator.

uPerform the following operation to set up the optical probe and voltage probe for long- term measurement.

Using E-CON

m“E-CON”w1(SETUP)c(Advan)

b(Channel)1(CH1)c1(CASIO)b(Volt)c1(LIST) 2w

c2(CH2)c1(CASIO)d(Light)c1(LIST) 3wwc(Sample)1(NO)c1(TIMER) 360wc1(NUM) 241ww1(START)

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

55555555555555555555555Other Things To Do

uConsider why there is such a large change in measured values over a 24-hour period.

uConsider why there are many changes in the graph over a comparatively short period of time.

uSee if the angle of inclination of the solar cell panel and the light intensity satisfy the expression shown below.

L= Lmax cos(θ – θ max)

L: Light Intensity

Lmax : Maximum Light Intensity Value

θ (°) : Solar Cell Panel Angle of Inclination

θmax(°) : Angle of Inclination Determined by Preliminary Step

uPredict what changes can be expected throughout the year, and take long-term (24-hour) measurements during different seasons to see what happens.

5555555555555

5555555555555

5555555555555555555555

20020601