Data Acquisition, Digital Signal Processing and Statistical Analysis LAB-GUIDE

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Nov 24, 2013 (3 years and 6 months ago)

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Prepared by Joel Hilchey for Dr. H. deBruin, Summer 2005

Data Acquisition, Digital Signal Processing and Statistical Analysis Lab
-
Guide

1
Data Acquisition, Digital Signal Processing and Statistical Analysis

Data Acquisition, Digital Signal
Processing and Statistical Analysis

LAB
-
GUIDE


Welcome to the first lab session of the course! You should print this document and bring it to the lab
with you, as it will be a guide to working through the lab sessions and

manuals provided with the
software.


Before starting the lab itself, find the BioRadio 150 unit, make sure there are batteries in it and turn it
on.


Open the “BioRadio Capture Lite” program. The program should detect the BioRadio. This
application allo
ws for direct communication with the BioRadio and enables signals to be acquired.
Try pressing the green 'START' button. Without any input to the BioRadio, you'll just see noise. You
can re
-
scale the axes by right
-
clicking and selecting or de
-
selecting
“Autoscale”. Try this with the
appropriate axis and the noise may show up more clearly.


Press the red 'STOP' button. You may need to hold it down for a second or so to fully stop the
program
-

think about why this might be based on your knowledge of prog
ramming.


The BioRadio has flexibility in its construction and two
-
way
-
communication capabilities with the
computer unit. The input ranges and sample rates for each channel are programmable. To see how
this works, click the gray 'Config' button. A scree
n will pop up that shows the current settings of the
BioRadio. Load a new set of settings
-

try Loading the LabDAQBasis file. Now click 'Program'. In
previous models of the BioRadio, before starting each lab, the user needed to program the settings in
th
is manner. However, with the BioRadio 150, this step is built
-
in to opening the lab sessions. Still, it
is a good idea to take note of the settings and think about why they are set that way. You will see that
they will be different for different physiol
ogical measurements.


Close the BioRadio Capture Lite software and open the Clevelabs software.


You will need to Log In before you can access any labs. This creates a folder where any data you save
will be stored. Choose a group name for yourselves and
use that as your log in name.


Open the Data Acquisition (DAQ) lab session and click the book in the top right corner to see the lab
manual specific to the lab session. You will have viewed this while doing your pre
-
lab.


Start reading on page 12 of the l
ab manual. You'll notice you've already completed some of the steps;
there's no need to do these again. Step three on Page 13 is the first major step you have not completed.
Find the “Test Pack” amongst your lab equipment and connect it as described.


R
ead until the end of page 17.

Prepared by Joel Hilchey for Dr. H. deBruin, Summer 2005

Data Acquisition, Digital Signal Processing and Statistical Analysis Lab
-
Guide

2
Data Acquisition, Digital Signal Processing and Statistical Analysis


Page 18
-
20 talk about the Post
-
Processing Toolbox. Read through this to see how it can be used.
We'll use it later on.


The lab instructions start on page 21. Go ahead and start working through each step. It's fairly basi
c
stuff, so take some time to play around with it to make sure you're comfortable with everything being
presented and discussed. A few notes as you go through:


Don't be too concerned about the “screen shots” for the report. The data in the files is more

important
because it can be processed later. Choose some things that you think are particularly interesting and
you think demonstrate your understanding. Demonstrate and explain these to a T.A.


Raw Data Step 6: Don't worry about finding the line
-
of
-
sig
ht range of the BioRadio
-

the room isn't big
enough to reach the limit.


Resolution: This refers to the number of divisions between units. The scale in the Clevelabs software
is poorly worded. Play around with it and figure out what it means based on dif
ferences in what you
see in the signal.


Open the Post
-
Processing Toolbox as directed. You may wish to try something in Excel also. If you're
interested, trying saving the data and taking it home to try with LabVIEW or MATLAB.


Quickly discuss all the di
scussion questions with your partner. If something is unclear, ask a T.A.


Go back to the Main Menu and open the Digital Signal Processing lab session. The setup is the same
so there is no need to disconnect anything. Click the 'START' button then “Spec
tral Analysis” tab.
Open the DSP lab manual and start reading at the section labelled Spectral Analysis on page 10.


Follow the procedure using the noise adding, filtering, and mathematical functions. Play around with
this until you feel you have a very
good understanding of it.


Work through the discussion questions with your partner. Don't worry about number eight using
MATLAB. Number 12 (designing a filter) is an excellent question that WILL help you do better on
the exams in this course. Don't worr
y about doing it in the lab though. Instead, take it home and
make sure you understand it and are comfortable with it then.


Make sure you've talked with the T.A.s enough to convince them you know what you're talking about and earn your full
lab performan
ce mark. Check in with them before packing up so that if they want you to demonstrate anything, you and
your partner can easily do so.


If you have time at the end, you may wish to open the Statistical Analysis session. Work through the
subjects that you

want to refresh in your mind. There's no points associated with this section, but
many people may find it useful to review and further familiarize themselves with the CleveLabs
software.


That's it for this lab
-

well done! Next time you'll actually be m
easuring physiological signals from your heart!