CBL Interfacing

Shivering Isn't Enough: Heat Conservation In Homeotherms

Procedure

Procedure (Your teacher will assign you to experiment I or II. For experiment I follow steps A-I and then continue with steps. For experiment II, follow steps J-R and then continue with step S.)

A.

Setting Up the TI-82, CBL and TEMPERATURE PROBE (Experiment I)

Naked vs. Insulated Animal

Connect the CBL unit to the TI-82 graphing calculator using the link cable and the I/O ports located at the bottom edge of each unit. Make sure the cable is pushed all the way into the ports.

Connect the Temperature Probes (TI or Vernier) to the Channel 1 and 2 ports located at the top edge of the CBL unit.

B.

Entering the Program

Press ON to turn on your CBL.
Press ON to turn on your TI-82 calculator.
Press PRGM.
A menu will appear. Choose CEMBIO.
prgm CHEMBIO will appear on your screen. Press ENTER
VERNIER SOFTWARE, CHEMISTRY BIOLOGY WITH CBL will appear on your screen. Press ENTER.

C.

Setting Up The Probes

A menu will appear. Choose SET UP PROBES.
ENTER NUMBER OF PROBES WILL APPEAR. Press 2 and then ENTER.
A menu will appear. Choose TEMPERATURE.
USE LOWEST AVAILABLE CHANNELS. ENTER CHANNEL NUMBER will appear. Press 1 and then ENTER.
A menu will appear. Choose TEMPERATURE.
USE LOWEST AVAILABLE CHANNELS. ENTER CHANNEL NUMBER will appear. Press 2 and then ENTER.

D.

Running The Experiment

A menu will appear. Choose COLLECT DATA.
A menu will appear. Choose TIME GRAPH.
ENTER TIME BETWEEN SAMPLES IN SECONDS: will appear. Press 20 and then ENTER.
ENTER NUMBER OF SAMPLES: will appear. Press 60 and then ENTER.
SAMPLE, TIME 20.00 S, SAMPLES 60, EXPERIMENT LENGTH 1200.00 S will appear. Press ENTER.
A menu will appear. Choose USE TIME SETUP.
SET Y- AXIS, Ymin=? will appear. Type 25 and press ENTER.
Ymax=? will appear. Type 80 and press ENTER.
Yscl=? will appear. Type 1 and press ENTER.
Press [ENTER] TO BEGIN COLLECTING DATA will appear.

DON'T

press ENTER yet. It is time to set up the rest of your apparatus.

E. Set up the experiment as described and shown below.

F. Using both graduated cylinders, measure two quantities of 100 mL of heated water. Take one beaker and wrap a scarf around it.

G. Transfer the two 100 mL quantities of heated water to each of the two beakers, one "naked" and one wrapped in a scarf. Place both beakers on paper toweling.

H. Place the temperature probe from channel 1 in the non insulated beaker and the temperature probe from channel 2 in the insulated beaker. Position them such that the tip of the probe is below the surface, not touching the sides or bottom, and the tip should be in the same position in each beaker. Pull the scarf up over the top of the beaker so that the "animal" is completely covered. Allow 1 minute for probes to adjust. Be careful not to move the probes at all during the course of the experiment.

I. With the CBL unit and TI-82 graphing calculator on, press ENTER to initiate the experiment. The CBL is now collected data for 1200 seconds. Every 20 seconds the probe is measuring the temperature and storing the data for you. You will know when the experiment is over when the word DONE appears on the CBL. Be careful not to touch the apparatus. The probe detects very slight temperature changes!

Do not worry if your calculator turns off. The TI-82 has a battery saving device which causes it to shut off after about 5 minutes. Since the TI-82 has already sent instructions to the CBL, it does not have to be on until the experiment is done and it is time to transfer data from the CBL to the TI-82.

Go to step S-Collecting Your Data From the CBL.

J.

Setting Up the TI-82, CBL and TEMPERATURE PROBE (Experiment II)

Different Animal Shapes

Connect the CBL unit to the TI-82 graphing calculator using the link cable and the I/O ports located at the bottom edge of each unit. Make sure the cable is pushed all the way into the ports.

Connect the Temperature Probes (TI or Vernier) to the Channel 1 and 2 ports located at the top edge of the CBL unit.

K.

Entering the Program

Press ON to turn on your CBL.
Press ON to turn on your TI-82 calculator.
Press PRGM.
A menu will appear. Choose CEMBIO.
prgm CHEMBIO will appear on your screen. Press ENTER
VERNIER SOFTWARE, CHEMISTRY BIOLOGY WITH CBL will appear on your screen. Press ENTER.

L.

Setting Up The Probes

A menu will appear. Choose SET UP PROBES.
ENTER NUMBER OF PROBES WILL APPEAR. Press 2 and then ENTER.
A menu will appear. Choose TEMPERATURE.
USE LOWEST AVAILABLE CHANNELS. ENTER CHANNEL NUMBER will appear. Press 1 and then ENTER.
A menu will appear. Choose TEMPERATURE.
USE LOWEST AVAILABLE CHANNELS. ENTER CHANNEL NUMBER will appear. Press 2 and then ENTER.

M.

Running The Experiment

A menu will appear. Choose COLLECT DATA.
A menu will appear. Choose TIME GRAPH.
ENTER TIME BETWEEN SAMPLES IN SECONDS: will appear. Press 20 and then ENTER.
ENTER NUMBER OF SAMPLES: will appear. Press 60 and then ENTER.
SAMPLE, TIME 20.00 S, SAMPLES 60, EXPERIMENT LENGTH 1200.00 S will appear. Press ENTER.
A menu will appear. Choose USE TIME SETUP.
SET Y- AXIS, Ymin=? will appear. Type 25 and press ENTER.
Ymax=? will appear. Type 80 and press ENTER.
Yscl=? will appear. Type 1 and press ENTER.
Press [ENTER] TO BEGIN COLLECTING DATA will appear.

DON'T

press ENTER yet. It is time to set up the rest of your apparatus.

N. Set up the experiment as described below.

O. Using both graduated cylinders, measure two quantities of 95 mL of heated water. Now add 5 mL of oil to both graduated cylinders to reduce evaporation. Such evaporation would affect the rate of heat loss.

P. Pour the water/oil from one graduated cylinder into a 100 mL beaker. This represents your more box shaped animal. Pour the water/oil from the other graduated cylinder into a third graduated cylinder. This represents your more elongated animal. (It may seem like a wasted step, to pour water/oil from one graduated cylinder to another. However, each transfer of water/oil results in a heat loss and we want to ensure that the control and experimental are exposed to the same number of transfers.) Place both "animals" on a paper towel. Cover both openings with aluminum foil.

Q. Place the temperature probe from channel 1 into the beaker and the temperature probe from channel 2 into the graduated cylinder. Position the probes such that the tip of the probes is below the surface, not touching the sides or bottom, and the tip should be in the same position in each container. Allow 1 minute for the temperature probes to adjust.

R. With the CBL unit and TI-82 graphing calculator on, press ENTER to initiate the experiment. The CBL is now collected data for 1200 seconds. Every 20 seconds the probe is measuring the temperature and storing the data for you. You will know when the experiment is over when the word DONE appears on the CBL. Be careful not to touch the apparatus. The probe detects very slight temperature changes!

Do not worry if your calculator turns off. The TI-82 has a battery saving device which causes it to shut off after about 5 minutes. Since the TI-82 has already sent instructions to the CBL, it does not have to be on until the experiment is done and it is time to transfer data from the CBL to the TI-82.

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