Hints for effective data collection (cont.)

EasyData settings (for TI-83, TI-83 Plus, TI-84, and TI-84 Plus users only)

Setup data collection for Time Graph

Experiment length is the total time in seconds to complete all sampling. It’s determined by the number of samples multiplied by the sample interval.

Enter a number between 0.05 (for very fast moving objects) and 0.5 seconds (for very slow moving objects).

Note: See “To set up the calculator for data collection” on page 12 for detailed information about how to change settings.

Menu name

Description

Default setting

Sample Interval

Measures time between samples in seconds.

0.05

Number of Samples

Total number of samples to collect.

100

Experiment Length

Length of the experiment in seconds.

5

Starting and stopping

To start sampling, select Start (press q). Sampling will automatically stop when the number of samples set in the Time Graph Settings menu is reached. The CBR 2™ motion detector will then display a graph of the sampled data on the graphing calculator.

To stop sampling before it automatically stops, select Stop (press and hold q) at any time during the sampling process. When sampling stops, a graph of the sampled data is displayed.

Noise—what is it and how do you get rid of it?

When the CBR 2™ motion detector receives signals reflected from objects other than the primary target, the plot shows erratic data points (noise spikes) that do not conform to the general pattern of the plot. To minimize noise:

0Make sure the CBR 2™ motion detector is pointed directly at the target. Try adjusting the sensor head while viewing live data on the home-screen meter. Make sure the reading you receive is appropriate before starting an activity or experiment.

0Try to sample in a clutter-free space (see the clear zone drawing on page 7).

0Choose a larger, more reflective object or move the object closer to the CBR 2™ (but farther than 15 centimeters).

0When using more than one CBR 2™ motion detector in a room, one group should complete a sample before the next group begins their sample.

0Try moving the sensitivity switch to the Track position to reduce the sensitivity of the sensor.

8

GETTING STARTED WITH THE CBR 2™ SONIC MOTION DETECTOR

© 1997, 2004, 2006 TEXAS INSTRUMENTS INCORPORATED

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Texas Instruments CBR 2 manual Sample Interval
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CBR 2 specifications

Texas Instruments has long been a prominent player in the field of educational technology, and the CBR 2 (Calculator-Based Ranger 2) is a testament to their commitment to enhancing the learning experience, particularly in the realms of mathematics and science. Designed to complement graphing calculators, the CBR 2 is a versatile data-collection device that empowers students and educators to explore real-world phenomena through hands-on experimentation.

One of the main features of the CBR 2 is its ability to capture a wide array of data through various sensors. The device is equipped with an array of built-in sensors that can measure motion, including speed and distance. This makes it an invaluable tool for physics experiments, allowing students to visualize concepts such as speed, acceleration, and trajectory.

The CBR 2 utilizes ultrasonic technology to detect distance through sound waves. This feature enables students to conduct experiments that demonstrate principles of sound and motion in a tangible way. With a range of up to 6 meters, the CBR 2 provides accurate and reliable measurements that can be graphically represented using compatible Texas Instruments graphing calculators.

The device is highly user-friendly, with simple interfaces that allow users to easily collect and analyze data. The integration with graphing calculators simplifies the process of data visualization, enabling students to create graphs in real time as they conduct experiments. This capability is particularly beneficial in encouraging interactive learning and fostering a deeper understanding of scientific principles.

The CBR 2 is designed to be portable and durable, making it suitable for classroom settings as well as outdoor experiments. Its compact size and lightweight construction ensure that it can be easily transported, allowing educators to take learning beyond the confines of the classroom.

The CBR 2 also supports various modes of data collection, including Event Mode, which allows users to trigger data collection based on specific events. This feature is useful in demonstrating concepts such as projectile motion and collisions, providing students with hands-on experience that enhances their learning.

In summary, Texas Instruments' CBR 2 is a powerful educational tool that enables students to collect, analyze, and visualize data in an engaging manner. With its built-in sensors, ultrasonic technology, and seamless integration with graphing calculators, the CBR 2 stands out as a versatile device that enriches the educational experience. It not only provides a platform for conducting experiments but also cultivates critical thinking skills and a deeper understanding of scientific concepts, preparing students for a future in STEM fields.
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