Calorimetry – Expanded directions for TI/LabPro

Data collection in this lab will be conducted using a thermocouple probe attached to a TI-84+ calculator and Vernier LabPro digital-analog converter. Time-Temperature data will be downloaded to a computer and printed for later use in completing the laboratory report.

To use the equipment you will need to do the following, some parts may have been completed already in a previous lab section, but here is the complete list in order of operation – work through the checklist to set-up your data collection software:

A) SETUP & INSTALLATION PROCEDURE
1.  acquire a calculator/LabPro set with power supply for LabPro, plug it in to AC power. Wait for the “song” indicating proper power
http://www.vernier.com/innovate/images/labpro_accel.jpg
2.  acquire two temperature probes (silver metal probe with white connector end)
http://engineering.vernier.com/images/sensors/sts-bta.jpg
3.  A) plug temperature probes into the LabPro analog ports labeled CH1 and CH2
http://fs6.depauw.edu:50080/~harvey/Vernier/Images/LabProLeftSide.jpg
3. B) If instructed to do so, skip to step 6.
/ 4.  Download the LabPro Interface Software by Turning on the calculator, select – [LINK] arrow right [å] to select [RECEIVE] press and the device should indicate “Waiting…”
5.  Press the [TRANSFER] button on the GREEN LabPro (it will make a beep), If the DataMate program is already on the calculator select [Overwrite] to install a clean copy then press Wait for the screen to read “Done”
B) DATA COLLECTION PROCEDURE
6.  Start the program to acquire temperature data. On the TI-calculator press – select “DataMate” –
http://www.vernier.com/calc/images/dmscreen.jpg / 7.  Review the settings on the main menu, at the top the first line should read:
“CH1: TEMP (C) 21.7”
or whatever the current room temperature is.
If two probes are attached CH2: will be for the second probe.
If the display reads “-999.9” instead of the room temperature – press - this is a real calculator button - to recalibrate the sensors.
Note the MODE in the figure at left. For this lab we will use “TIME GRAPH” and in the sample screen on left the “180” indicates a 180 second experiment. This experiment needs 360 sec.
8.  To change the time of the experiment press to select [SETUP] then press the arrow key on the calculator to select [MODE] then press to select [TIME GRAPH]. Follow the menu to establish the interval (generally 1 second) and the number of samples (select 300 samples for a 5-minute trial). Select “OK” and “OK” to return to the main menu.
9.  On the calculator press key [START] to begin an experiment. Generally, you need to WAIT for a period after starting to establish the baseline temperature THEN perform the action (e.g. adding sample or mixing chemicals). Press to stop recording data in an experiment, or wait for the internal timer to end. A successful run should produce data something like that shown to the left. Press to return to the main menu.
C) PREPARING YOUR REPORT
10.  Press ” to return to the main screen, Press calculator key [GRAPH] to view the graph again. When you [EXIT] the program your data is still stored. Note the exit screen will indicate that time is stored in L1, CH1 is stored in L2 and CH2 is in L3. Press again to return to the main menu.
11.  Disconnect the temperature probes and power supply, and connect the calculator to the lab computer/printer station using the mini-USB connector. Start a new document in Graphical Analysis. “File” –“New” and don’t save the old one
Select “File”- “Import” –“From TI Device” (see inset box in picture below) and select Port: “USB Direct”; Choose the Data to Import: highlight L1, L2 and L3 (see below) and select OK
If the graph doesn’t have both data sets from CH1 (L2) and CH2 (L3) then left-click on column heading L3 in the gray column and drag it onto the graph. Print two copies, one for you and one for your lab partner.
12.  Disconnect the USB computer line from the calculator, return all equipment to the lab bench

Labpro Calorimetry Page 1 of 3 TI-LabPro