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Using LoggerPro for Data Acquisition, Graphing, and Analysis in Physics Experiments, Study notes of Optics

Bharat Ratna Dr. B. R. Ambedkar UniversityOptics

Instructions on using loggerpro, a versatile data acquisition and analysis tool, for physics experiments. It covers sensor configuration, data collection, graphing, and data analysis techniques. Users will learn how to calibrate voltage probes, change graph scales, add manual columns, and perform statistical analysis and curve fitting.

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2012/2013

Uploaded on 12/31/2013

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Using LoggerPro
“Nothing is more terrible than to see ignorance in action.”
J. W. Goethe (1749-1832)
LoggerPro is a general-purpose program for acquiring, graphing and analyzing data. It
can accept input from a video camera, read a video file or, through the LabPro or LabQuest
interface devices, acquire data from a variety of other sensors. Pictorial data can be reduced to x-
y coordinates of selected objects, while sensor data is presented in tabular form as a function of
time. The program will prepare plots of the data, compute statistics like the mean, fit specified
curves to a data series, and calculate derived quantities. Basic operations will be described here,
with more detail provided for each exercise.
To start LoggerPro you can click on the caliper icon in the main toolbar, or double-click
on one of the startup files with a .cmbl extension on the desktop. The startup file can configure
graphs, sensors and other features for a particular experiment, so this is the preferred method.
If the program is already running, you can get a clean copy with File > New on the taskbar,
or load a new startup file with File > Open... When doing so, or when quitting the program, you
will be prompted to save your previous work. This is usually not necessary but if you do wish to
save, use File > Save As... and follow the dialog to create a new file so that the original is
available for other students.
DATA COLLECTION - SENSORS
If using a LabPro, be sure that the power supply for the LabPro is plugged in, and that it
is connected to the computer by a USB cable. The LabQuest interface is powered by through the
USB cable.
The sensors needed for a particular exercise will usually already be connected to the
interface, but the program needs to know what sensors are connected to each port, and how they
should be calibrated or actuated. Loading the startup file specified for each exercise will provide
the proper configuration, a data table with useful columns, and graphs as needed. In the unlikely
event that the startup file settings are not adequate, the sensor configuration can be modified by
following Experiment > Set Up Sensors > LabYY I, where LabYY refers to whichever interface is
connected. Changes to the data collection rate and other parameters can be made with the
window under Experiment > Data Collection.... If you do make changes, do not save them under the
original file name.
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Using LoggerPro

“Nothing is more terrible than to see ignorance in action.” J. W. Goethe (1749-1832)

LoggerPro is a general-purpose program for acquiring, graphing and analyzing data. It can accept input from a video camera, read a video file or, through the LabPro or LabQuest interface devices, acquire data from a variety of other sensors. Pictorial data can be reduced to x- y coordinates of selected objects, while sensor data is presented in tabular form as a function of time. The program will prepare plots of the data, compute statistics like the mean, fit specified curves to a data series, and calculate derived quantities. Basic operations will be described here, with more detail provided for each exercise. To start LoggerPro you can click on the caliper icon in the main toolbar, or double-click on one of the startup files with a .cmbl extension on the desktop. The startup file can configure graphs, sensors and other features for a particular experiment, so this is the preferred method. If the program is already running, you can get a clean copy with File > New on the taskbar, or load a new startup file with File > Open... When doing so, or when quitting the program, you will be prompted to save your previous work. This is usually not necessary but if you do wish to save, use File > Save As... and follow the dialog to create a new file so that the original is available for other students.

DATA COLLECTION - SENSORS If using a LabPro, be sure that the power supply for the LabPro is plugged in, and that it is connected to the computer by a USB cable. The LabQuest interface is powered by through the USB cable. The sensors needed for a particular exercise will usually already be connected to the interface, but the program needs to know what sensors are connected to each port, and how they should be calibrated or actuated. Loading the startup file specified for each exercise will provide the proper configuration, a data table with useful columns, and graphs as needed. In the unlikely event that the startup file settings are not adequate, the sensor configuration can be modified by following Experiment > Set Up Sensors > LabYY I , where LabYY refers to whichever interface is connected. Changes to the data collection rate and other parameters can be made with the window under Experiment > Data Collection.... If you do make changes, do not save them under the original file name.

PHYS 231 Using LoggerPro 2

Once the program and sensors are configured, you start data collection by clicking the Collect button. After a brief pause, the sensors will be read at regular intervals until the Stop button is clicked or the time limit is reached. Data will appear in the table and on the graph, if present, as it is obtained. When data collection is complete, you can use the graphing and data analysis functions as described below. Voltage probes The LabPro and LabQuest interfaces can measure multiple voltages at up to ten thousand total samples per second. If necessary, the sampling rate and triggering options can be changed by going to Experiment > Data Collection.... Calibration of voltage measurements is not usually needed. Voltage probes are often used to read out transducers that convert some other quantity such as displacement or light intensity to a voltage signal. In that case, the calibration function can be used to display the measured voltage in physically meaningful units. Do this by going to Experiment > Calibrate > LabYY:1 CH XX: Voltage (+/_10V) , where XX is the input channel of the voltage probe to be calibrated. Select Calibrate Now and set physical units as desired in the labeled box. Set the transducer to a known value and enter the value, in physical units, in the first calibration box. Change the transducer to a different value, and enter that in the second calibration box. The software will provide a linear translation from voltage to physical units, and use that in subsequent data acquisition.

GRAPHING Data from sensors or a movie is usually graphed automatically when appropriate. To change the graph scales, click at either end of the x or y axis. Enter the maximum or minimum scale value desired and push return. To change the quantity being graphed on either axis, click on the axis label and select the desired variable from the menu. You can add additional columns for manual data entry using Data > New Manual Column. To calculate a new column from data in previous columns, use Data > New Calculated Column... and follow the dialog that pops up. The pull-down menus in the box allow you to pick from the available variables and functions to calculate the new column entries. To use LoggerPro as a manual graphing tool, load the startup file Graph.cmbl , ignoring any attached sensors. This will produce a data table with two columns for manual data entry. Type data into the cells of the table, and it will be plotted on the adjacent graph. Adjustments can be made as before.

ANALYSIS OF GRAPHED DATA A number of analytic tools can be activated by menu items under Analyze or by clicking on icons in the task bar. The analysis will use all the data in the selected graph, unless a subset