Computer Interfacing

Transpiration

Procedure - Prepare the Computer

1. If you have Biology with Computers, open "EXP12.LXP" from the experiment files of Data Logger. Load the calibration file "EXP12.CLB". The vertical axis has pressure scaled from 0.90-1.00 atm. The horizontal axis has time scaled from 0-20 min. That's it! The computer should be ready to collect data.

Make an Experiment File:

If you do not have Biology with Computers, set the Data Logger program as follows:

From the Display menu:

1. Choose One Graph
2. Choose Timebase. Click on Minutes.

From the Collect menu:

1. Choose Data Rate from the Collect menu. Enter 12 points/minute. The data rate is set to 12 points/minute.
2. Turn the Event Mode off, if necessary. Examine Event Mode from the Collect menu. If it is checked, choose it to deselect the menu item.
3. Load the calibration for the pressure sensor from the Data Logger Experimenter Files:
   • Choose Calibrate from the Collect menu.
   • Choose Load Calibration and select the appropriate file. Load it into Port 1.
4. Turn the Display Inputs on, if necessary. Examine the Display Inputs menu item. If it is not checked, choose it to select it.

Alter the plot axes:

1. The vertical axis has pressure scaled from 0.9 to 1.0 atmospheres. To change the plot labels:
   • Double click the mouse when the cursor is over the lowest value displayed on the vertical axis of the plot. When the value is highlighted, type "0.9".
   • Double click the mouse over the highest value displayed on the vertical axis of the plot. When the value is highlighted, type "1".
2. The horizontal axis has time scaled from 0 to 20 minutes. To change the plot labels:
   • Double click the mouse when the cursor is over the lowest value displayed on the horizontal axis of the plot. When the value is highlighted, type "0".
   • Double click the mouse over the highest value displayed on the horizontal axis of the plot. When the value is highlighted, type "20".

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