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IV. Using the Data Logger
Instructor Directions: The goal of this section is to help the students become
familiar with entering the data log area, choosing the rate of sampling and the
number of samples. They will also learn how to view the data from the screen and
how to transfer the data from the graphing calculator.
The Data Logger setting is used when time is of importance. For example: When you
want to measure, motion, change of temperature, change of pressure, etc. over a period of
time. The EA100 is also capable of saving each of the data points for later transfer to a
graphing calculator or even for viewing from the EA100 display screen itself.
When in the Data Log mode, there are two important questions that must be answered.
1. How many samplings must be taken to get an “accurate” picture of the real
world relationship?
2. How fast should the samplings be taken?
The answers might vary tremendously depending on the physical phenomena that is being
measured. If you are dropping a ball from a reasonable height you need many samples
taken quickly. If you are measuring the light flicker of a fluorescent light, then the
frequency of the light flicker is of concern, this will effect your choice for the rate of
sampling.
The EA100 has some pre-defined choices available for both the numbers of samples
and the sample rate.
A. Entering the Data Log Mode
Turn on the EA100. Remember that the initial mode is communications. We have not
investigated this area yet. We must realize that to run the data logger, you must first
choose the sample rate, and then choose the number of samples. Casio’s EA100 also has
a third area called time definition area that allows you to change how the time is displayed
in the list of the graphing calculator once this set of data is transferred. This will be
explained further in a moment.
Keystrokes:
1. On (Turns the EA100 on, and into the communications mode)
2. Shift, Mode (Brings you into the setup area for data log, notice the unit
time in the corner, either seconds or milli-seconds)
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