PART10 Characteristic Circuit of Electric Element

Experiment 2 : Experiment for Lighting Control Switch Circuit

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PART10Characteristic Circuit of Electric Element

Experiment 2 :Experiment for Lighting Control Switch Circuit

Experiment Process

1. Using Block a of M10 board, make a connection as in fig.10-3.

2. Make the output power of DC power supplier as 6V.

3. Turn VR1 to turn on LED1. Measure and record the voltages on A, B, C points.

4. Measure and record the voltages on A, B, C points while shading CdS window with hands.

tab1

Experiment 10-2.1

1.Connection(Block a of M10)
1.Power Connection

Connect between V1 terminal of Variable Power on the left of M10 board and V+ terminal of Block a with red line, and between COM terminal and the earthing line with black line.

2.Measuring Instrument Connection

Connect between High terminal of Multimeter on front panel and the base terminal of TR1 of Block a on M10 board with red line, and between Low terminal and the earthing terminal of Block a with black line.

2.Wiring Diagram
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3.Measurement
  1. 1Choose variable power at left menu of Touch LCD panel and set up at 3 CH DC with button_arrow for DC Voltage V1 to become 6V.

    Click on , and supply the output of DC 6V to the circuit.

    Turn on the SW1.

    3CHDC

    Turn VR1 and turn on LED1.

  2. 2Choose dmm at the left menu of Touch LCD panel and click dcv .

    DigitalMultiMeter

    Record the measured value(VA point) in the relevant column of table 10-2.

    Plug out the red lead wire connected between High terminal of Multimeter on front panel and the base terminal of TR1 of Block a on M10 board and change the connection to the base of TR2(VB point), the emitter of TR2(VC point) and measure the voltage and record the result in the relevant column of table 10-2.

  3. 3Execute the process 2) above while shading CdS with hands and record the result in the relevant column of table 10-2.
  4. 4After the measurement, choose variable power at the left menu of Touch LCD panel and click on red to cut off the power supply.
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Experiment Result Report

result
Experiment for Lighting Control Switch Circuite
1. Experiment Result Table

Table 10-1

result_table
 Measured Resistance
Value of CdS
CdS resistance value under current state
CdS resistance value when CdS is shaded with hands
CdS resistance value when the light is applied
to CdS with the lamp

Table 10-2

result_table
CDS State VA PointVB PointVC PointLED1 State
Bright
Dark
2. Review and Explanation
1) In table 10-1, describe how the resistance value of CdS changes according to the intensity of light.
2) In table 10-2, describe how the resistance values under normal state and that under the light are different.
3) With the measured value of table 10-2, describe the operation of lighting control switch circuit.
3. Discuss the experiment result.