Phys 1 Student Workbook.pdf

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Physics Labs with Computers, Vol. 1Student WorkbookP32: Variation of Light Intensity 012-07000APART I: Computer Setup1. Connect the ScienceWorkshop interface to the computer, turn on theinterface, and turn on the computer.2. Connect the Light Sensor cable into Analog Channel A on theinterface. Connect the Light Sensor to the cable.3. Open the document titled as shown:500 scientificPASCOInterfacescientific300PASCOANALOG CHANNELSScience W orkshop D A TA LO G G ING INSTRUCTIONSScienceWorkshopInterfaceDataStudio ScienceWorkshop (Mac) ScienceWorkshop (Win)P32 Vary Light.DS P54 Light Bulb Intensity P54_BULB.SWS• The DataStudio document has a Workbook display. Read the instructions in theWorkbook.• The ScienceWorkshop document opens with a Scope display of voltage from the LightSensor in Channel A and a Frequency Spectrum (FFT) display for the same sensor. It alsohas a Digits display for the voltage from the Light Sensor.• The data measurement is set at 5000 Hz (set by the Sweep Speed control in the Scopedisplay). The Frequency Spectrum (FFT) is set to 256 data points.PART II: Sensor Calibration & Equipment Setup• You do not need to calibrate the Light Sensor. However, you may need to adjust thesensitivity of the sensor, depending on the brightness of the light source and how close thesensor is to the source.Adjusting Light Sensor Sensitivity• The Light Sensor has a GAIN switch on the top of the sensor box. The GAIN switchselects the amount of amplification for the signal that is sent to the interface. The settingsare 1, 10, and 100. The setting of 10 amplifies the signal ten times and the setting of 100amplifies the signal one hundred times.Try the following to become more familiar with the Light Sensor:• Place the Light Sensor on a table so the port on the sensor is below an overhead light. Setthe GAIN switch to 1.• Start monitoring data. Move the Digits display of Input Volts so you can see it clearly.• Switch the GAIN to 10 and observe the value of Input Volts in the Digits display. Thenswitch to 100 and observe the value of Input Volts.NOTE: The maximum voltage from the sensor is 4.9 V for any GAIN setting.• Cover the Light Sensor port and observe the value of Input Volts.• Return the GAIN setting to 10. Pick up the sensor. Observe the value of Input Volts as youmove the Light Sensor closer to the overhead light source. Observe what happens whenyou move the Light Sensor farther from the light source.• Click STOP to stop monitoring data.p. 230 ©1999 PASCO scientific P32
Name _____________________ Class ______________ Date _________Equipment Setup1. Place the Light Sensor within a few feetof a fluorescent bulb that is powered byAC.2. Turn on the fluorescent bulb.PART IIIA: Data Recording – Fluorescent Bulb, AC1. Start monitoring data. (Hint: In DataStudio, click the ‘Start’ button ( ). InScienceWorkshop, click the ‘MON’ button.) Arrange the Scope display, the Digits display,and the Frequency Spectrum (FFT) so you can see them clearly.• NOTE: It is likely that you will see a value in the Digits display, and a spectrum in theFrequency Spectrum display, but nothing in the Scope display. This is because the triggercontrol in the Scope is on, and the trigger level may be set too low for the voltage producedby the Light Sensor.2. Adjust the Scope display until you see the trace of voltage from the Light Sensor:• First, adjust the trigger level.In DataStudio, move the small triangle (the ‘Trigger Level’ pointer) on the left side of thedisplay up or down to the desired voltage level. In ScienceWorkshop, click in the spacealong the left edge of the Scope display that is above the Trigger Level pointer. When youclick above or below the Trigger Level Pointer, it “jumps” to the spot you clicked. Thevalue in the Digits display will indicate the approximate trigger level you need.TriggermenuTriggerLevelpointerCLICK ABOVE TORAISE THETRIGGER LEVELCLICK BELOW TOLOWER THETRIGGER LEVELTRIGGERLEVELPOINTERP32 ©1999 PASCO scientific p. 231
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Phys 1 Student Workbook.pdf

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