C
OPYING PERMITTED PROVIDED
TI
COPYRIGHT NOTICE IS INCLUDED
10
G
ETTING
S
TARTED WITH
CBR
© 1997 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
Hints for effective data collection
(cont.)
REALTIME=YES
Use
REALTIME=YES
mode:
0
for slower objects
0
to see the results as they are collected
0
when you need to collect or plot only one type of data (distance, velocity, or acceleration)
for a sample
In
REALTIME=YES
mode, the
CBR
processes the requested plot data (distance, velocity, or
acceleration), which is transferred to the calculator following each individual distance
measurement. Then
RANGER
plots a single pixel for that pulse.
Because all of these operations must be completed before the next sample can be
requested, the maximum rate at which data can be sampled in
REALTIME=YES
mode is
limited.
It takes approximately 0.080 seconds just to sample, process, and transfer the data for a
single data point. Additional time is required for operations such as plotting the point, which
slows the effective sample rate to approximately 0.125 seconds in
RANGER
.
REALTIME=NO
Use
REALTIME=NO
mode:
0
for faster objects
0
when smoothing is required (see page 9)
0
to operate the
CBR
in detached mode (see page 11)
0
when you need to collect or plot all types of data (distance, velocity, and acceleration) for
a sample
In
REALTIME=NO
mode, data is stored in the
CBR
and not transferred to the calculator until
after all sampling is completed. The sample rate can be as fast as once every 0.005 seconds
for close objects. Data for time, distance, velocity, and acceleration is transferred to the
calculator.
Because the data is stored in the
CBR
, you can transfer it from the
CBR
to a calculator again
and again.
0
Each time you change smoothing, the
CBR
applies the new smoothing factor, transfers
the adjusted data to the calculator, and stores the smoothed values in the lists.
0
Choosing a domain changes the lists stored in the calculator. If you need to, you can
recover the original data from the
CBR
. From the
MAIN MENU
in the
RANGER
program,
choose
TOOLS
. From the
TOOLS
menu, choose
GET CBR DATA
.
0
You also can share the same data with many students, even if they are using different
types of TI graphing calculators. This allows all students to participate in data analysis
activities using the same data (see page 11).