Pasco TD-8513 Heat Conduction Apparatus Uživatelský manuál stáhnout pdf (Strana 11)

Model No. TD-8513 Experiment #2: Angstrom’s Method

A. Aluminum

Set-up

1. In DataStudio set the sampling rate of the Temperature Array to 2 Hz. Create a

graph to display temperatures measured by both thermistors in the aluminum bar

(T5 and T6).

2. Set the power supply to output an 8 V positive triangle wave with a 30 s period,

as shown in the diagram. See the PI-9877 DC Power Supply manual for detailed

instructions.

Procedure

1. Start recording data. While driving the apparatus with the triangle wave, monitor

the temperature waves until each has stabilized with constant amplitude. Stop

recording and delete the data run. (Let the power supply continue to run.)

2. Start recording data. After two complete cycles of the driving wave, stop record-

ing.

3. On the graph, measure the amplitudes of both waves (A

and A

) and the time dif-

ference between corresponding peaks of the two waves (∆t). Make a copy of the

table below and record these measurements in it.

4. Repeat steps 2 and 3 for a total of three data runs and record all values in your

table.

5. On the power supply, set the period of the triangle wave to 40 s and repeat steps 1

through 4.

You can start the following analysis while you wait for the system to stabilize.

6. Set the period of the wave to 50 s and repeat steps 1 through 4 again.

Analysis

1. For each of the data runs recorded with a 30-second triangle wave, calculate the

thermal conductivity (k). What is the average value of k? What is the uncertainty

of the average?

8 V

0 V

30 s

Power Supply Settings:

Max. Voltage 8 V

Min. Voltage 0 V

Period 30 s

Auto-repeat −0

Period (s)

∆

(W/m·K) Average

(W/m·K)

Average

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 17 18

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