The Caliper:V16 #1: CBL News




In This Issue:

Water Quality with CBL
Logger Pro for iMac
New Stuff
CBL™ News
Innovative Uses
Bits and Bytes

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The Caliper
A Publication for Users of Vernier Products
Volume 16, Number 1Spring 1999

CBL™ News

by Richard Sorensen


TI-83 Plus Calculator
TI-92 Plus Calculator
Graphical Analysis Update
Changes to TI Product Line
Digital Control Unit
College Mathematics through Applications
Solar Power for the CBL
Data Collection Activities for Middle Grades with the TI-73, CBL, and CBR
Long-Term Data Collection with the CBL


TI-83 Plus Calculator

After its introduction in 1993, the TI-82 quickly became the calculator of choice for science and math students. Three years later, Texas Instruments upgraded the TI-82 by introducing the TI-83, which has become their most popular graphing calculator. It has been another three years, and TI has now upgraded the TI-83. They have introduced the TI-83 Plus, and this calculator might be the last one you need for quite a few years.

The TI-83 Plus is basically a supercharged TI-83. It includes all the capabilities of the TI-83 and can be used side by side with the TI-83. The most exciting improvement is the addition of Flash ROM technology. Flash ROM provides many valuable improvements, including:

  • The TI-83 Plus is electronically upgradeable. If you bought a TI-82 in 1993, you could never take advantage of calculator software maintenance updates that were included on newer calculators. If you wanted new features, like sine regression on the TI-83, you bought a new calculator. That has changed with Flash ROM. Now when TI makes a maintenance update to the calculator software, you can download the update from the TI web site and use
    TI-GRAPH LINK™ to load it onto your calculator. If TI makes a major revision to the calculator software, you can purchase the new version from the TI web site, and you won’t have to buy a new calculator.
  • TI-83 Plus has six times more user memory than the TI-83. This includes 24K of RAM, but it also includes 160K of data archive memory used to store data, programs, and additional applications. The extra memory makes it easier to collect and analyze data with calculators. For example, if the calculator RAM is full of educational games gathered from the Internet, the programs can be archived, i.e., moved to Flash ROM. The RAM is now free for CBL data.
  • The data archive can be used to store and execute calculator software applications. Applications are different from programs that you probably used in the past. Applications load into Flash, while programs load into RAM. For example, we have worked with TI to convert our CHEMBIO and PHYSICS programs to applications. Using TI-GRAPH LINK, you will be able to load both of these applications into Flash ROM. (You can have up to 10 applications loaded into Flash ROM.) You then press the APPS button on the calculator and choose an application. The calculator loads the appropriate part of the program from Flash into RAM and runs the subprogram. This process leaves RAM for data. For more information about the CHEMBIO and PHYSICS applications, check the CBL Programs page of our web site, www.vernier.com/cbl/progs.html. Another example of an application is a powerful periodic table developed by TI. If you are interested in this product or other TI-83 Plus applications, visit www.ti.com/calc/flash/83papps.htm.
  • The Flash ROM allows you to store data runs, since the TI-83 Plus has a Group option. This feature groups data lists into one file, and the file will be automatically stored in the data archive. Later you can Ungroup the file, which will move the data into RAM.

Flash ROM is coming to another calculator­the TI-92. The TI-92 Plus replaces the TI-92. The TI-92 Plus will have 500K of memory, including 188K of RAM and 384K of Flash ROM. The Flash ROM can be used to store data, programs, and applications. The TI-92 Plus also has an enhanced anti-glare, black-on-gray screen. The TI-92 Plus will contain the Advanced Mathematics Software that is already available on the TI-89 or TI-92 Plus Module. All this is in a package that will sell for the same price as the TI-92, $175, and will be available in early June. The order code is TI-92PL.



Graphical Analysis Update
We have modified our Graphical Analysis programs to import data from the new TI-83 Plus calculator. Check our web site or contact us for details on upgrading either your Windows or Macintosh version of Graphical Analysis.


Changes to TI Product Line
Effective May 1, we will be lowering prices of two calculators. The TI-82 will sell for $78, while the TI-86 will sell for $109.

The contents of the TI-73, TI-82, and TI-83 calculator Teacher Packs is changing. The Teacher Packs used to include rechargeable alkaline batteries and a recharger station. In talking with teachers, TI learned that most teachers use the rechargeable batteries once and then throw them away. From now on, the Teacher Packs will be shipped with standard alkaline batteries, which have a longer life than rechargeable alkalines. A battery recharger will not be included.


Digital Control Unit
Our new Digital Control Unit (DCU) has already lead to a lot of creative projects! We recently created an automatic titrator and a mass driver using cow magnets and electromagnets.

Scott Ausbrooks (Harmony Grove HS, Benton, Arkansas) came up with a clever way to use the DCU to build the classic Monkey Gun physics demonstration. He developed this demo as part of the Arkansas Physics Lending Library Program. A photogate is placed at the end of the barrel of the gun and connected to the CBL. A Digital Control Unit (order code DCU-CBL, $59) is connected to the same CBL and it powers an electromagnet that holds up the metal-can target. When the photogate is blocked, the DCU cuts the power to the electromagnet. A custom program is available for this demo. It is on our web site at
www.vernier.com/dcu/index.html

By the way, we are planning to have a Digital Control Unit project contest this fall. It will involve building interesting projects controlled by a DCU, a CBL, and a calculator. Details will be in our fall newsletter. If you like to have your students do projects, keep this contest in mind.



College Mathematics through Applications

by John C. Peterson, William J. Wagner, Stephen S. Willoughby

If you teach advanced mathematics at the high school or college level, you might be interested in this new textbook. Designed for technical mathematics and precalculus students, this book covers advanced algebra, trigonometry, geometry, and intuitive calculus. The authors make extensive use of the TI-83 calculator enabling students to concentrate on problem-solving skills. The mathematical concepts are put into focus through a chapter project, presented at the beginning of each chapter. The CBL and sensors are often used to develop solutions to these projects. For information on the text, contact Delmar Publishers at 800-347-7707 or visit their web site, www.cmta.delmar.com



Solar Power for the CBL

Patrick Technologies Inc., Lisle, Illinois, manufactures a variety of photovoltaic panels. In addition, the company produces a battery pack that can be recharged with their solar panels. Their SolarVerter F9150 and U9600 panels or rechargeable battery can be used to power the CBL. The solar panels cost between $45 and $110, and the battery pack sells for about $50. You can get information on their products by calling (888) 858-2801 or visiting their web site,
www.solarverter.com

Data Collection Activities for Middle Grades with the TI-73, CBL, and CBR
by Ellen C. Johnson and David A. Young

This book is an excellent source of activities to introduce middle school students to data collection technology. The book contains twelve activities that integrate mathematics and science, with an emphasis on data collection and analysis. Each activity presents a problem relevant to the student's everyday experience. Step-by-step instructions take the students through data collection and analysis. Black line masters for student handouts and an extensive set of teacher notes are included. This book is available for $20 (order code TI-DCA).




Long-Term Data Collection with the CBL

Long-term, remote data collection with the CBL and water quality sensors has been a challenge in the past. Power management features of the CBL made it difficult to maintain power to sensors such as the pH System and Dissolved Oxygen Probe throughout data collection. The solution is our new External Power Adapter for data collection with the CBL (order code CBL-EPA, $15). When connected to a 6-V lantern battery, the External Power Adapter provides constant power to the sensor. If you are performing long-term experiments in the lab, the External Power Adapter can also connect to a TI-9201 AC adapter, instead of the 6-V lantern battery.

Dissolved oxygen, water temperature, and light intensity data collected in the field for a 24-hour period using a CBL and TI-83 graphing calculator

TI-92 Plus Calculator


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