6
III. Using the Multimeter
The multimeter is used when sample rate and time are unimportant. (For example: if you
are just taking random samples of temperature in different locations throughout a
building.) The readings are noted visually by looking at the display and writing them
down, or storing them in a list. The EA100 does not save the readings while in the
multimeter area, it is only capable of displaying the data.
Instructor Directions: The goal is to slowly integrate the functions of the EA100
from simplest to most difficult. The multimeter area is the simplest way to get an
initial reading from a probe. Make sure the students are comfortable selecting and
using the multimeter area.
A. Selecting the Multimeter Area:
When you turn on the EA100, it comes up with an initial reading. (Record time is
blinking & done is displayed.) This is an area called communications mode. In
communications mode the EA100 is waiting to receive commands or signals from a linked
graphing calculator. We are not interested in this mode at this time. Remember, the
communications mode is always the starting reference position when you turn on the
EA100. Entering the Multimeter area is very simple. Simply hit the mode button and you
immediately enter into the multimeter area. (The display should have the multimeter
area selected and blinking.)
Keystrokes:
1. On (Turns the EA100 on and in the Communications Mode)
2. Mode (Toggles to the Multimeter area for time independent readings)
B. Student Interaction/Activity Using the Multimeter Area
Student Activity: Have the workshop participants become familiar with each probe.
(Light, voltage, and temperature.) Have them plug in all three into channel one, two, and
three. Turn on the EA100. Choose the Multimeter setting and notice various readings of
the EA100. Learn how to switch between channels of the EA100 and see how the
temperature probe data changes while you rub the probe with your hands.
Extension/Other Suggestion: This is a good time to perform the first lab using the
multimeter capability. One easy and applicable lab is the Twinkle, Twinkle, experiment
that uses the light probe and compares the illuminance rating at various distances from a
light source. This activity also helps to incorporate the use of lists and best fit curves and
regressions from the graphing calculator. You should allow about an hour for this to be
performed.
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