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BIOPAC Systems, Inc.
Training Seminar
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About BIOPAC
Hardware Setup
Software Setup
Subject Preparation Data Acquisition Demonstration
Data Analysis
Application Notes and Other Resources Question and Answer Session
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MP150
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MP150 Range of the MP150 system: from -10 to +10 Volts
A/D resolution: 16 bit
Dual A/D converters: Reduce Channel/Channeltiming latency
65536 levels or 30 microvolts resolution
Minimum change that can be detected is 30 uvolts. If
the signal is not strong, it must be amplified.
A/D Conversion
Sample Rate
Max Sample Rate = 200 K Samples/Sec. Maxaggregate of 400 kHz
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Sampling RateECG waveform sampled with relatively fewsamples per second. The black dots arethe sample points.
Above waveform as it would look if plotted.
Representation of the same ECGwaveform sampled at a relatively highersampling rate.
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Recommended sample rates for physiological signalsSampling RateECG 200 Hz (1,000 Hz for HRV)
Respiration 50 Hz
GSR 50 Hz
EMG 1,000 Hz to 10,000 Hz
EEG 200 Hz
EOG 200 HzBlood pressure 100 Hz
Flow rate 50 Hz
EGG (electrogastrogram) 1 Hz
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UIM100C Universal Interface 16 analog channels
Input range between
100 mv and 10 v
16 digital outputs
Digital Trigger
Channels are input andoutput
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Amplifier Settings Red Channel Switch
Only one amplifier per channel
Gain
Depends on application
Filters AC for Biopotential Recording
DC for Transducer Recording
Transducer Amplifiers: Calibration Required
Biopotential Amplifiers: No Calibration Required
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ECG100C Amplifier Designed to pass the ECG signal (P, Q, R, S,
T waves) with minimal distortion
Works with disposable or reusable electrodes
Typical Human Settings:
GAIN: 2000
MODE: NORM35Hz LP: ON
HP: 0.5 Hz
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Filters: Low pass, High Pass, Band Pass, Band Stop, Notch
Low Pass at 5Hz
High Pass at 5Hz
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Filters: A practical Low Pass Filter
example with ECG Part I
Noisy ECG data
Data after applying a low pass filter at 35Hz
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Filters: A practical high pass filter
example with ECG Part II
Drifting ECG data
Data after applying a high pass filter at 1Hz
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DC vs. AC example with skin conductance
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Software SetupBeforeyou start
recording:
MP150 Menu
Set Up Acquisition
Manual recording
Automatic recording
Sample rates
Acquisition length
Online Averaging
Evoked Response
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Software SetupBeforeyou start
recording:
MP150 Menu Set Up Channels
Analog, Digital, andCalculation Channels
Scaling andCalibration
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CALIBRATION GSR Scaling
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Software Checklist Set analog, digital, and calculation channels
Make sure analog channels match amplifierchannels
Make sure Source channels are set in calculationchannel setup
Set Acquisition Type and Length
Set up triggering or stimulator if desired
Make sure green light is on
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Electrodes, Leads, and Gels
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Subject Preparation Abrade the skin (ELPADs)
Electrode Gel
Wait 5 minutes for best results
Minimal movement
Impedance check (EEG, etc.)
One ground per subject!
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Einthovens Triangle
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Hints for minimizing data error Subject should remain as relaxed as possible
Subject must avoid excessive extraneous movement
Press ESC to add a marker every time you give the subjectan instruction
Add text to describe all interventions
During comparative data analysis, ensure that all scales arethe same for every channel
Remove all jewelry or other metal objects
Check all cable connections
RECORD BASELINE PERIOD!
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Hardware ChecklistBeforeyou start recording:
Make sure there is only one amp per channel
Check the GAIN and filter settings
Check Subject
Check electrode placement
Let gel soak in (5 minutes)Make sure there is only one ground per subject
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Software Setup Set Up Triggering
Set Up Stimulator
Set Up EventHotkey
Show Input Values
Show ManualControl
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Data Analysis Transform and Analysis Menus
All post-acquisition processes Offline filtering Waveform math
Fast-Fourier Transform Automated analysis
Find Rate functions Find Cycle/Peak functions Specialized Analysis Package
AcqKnowledge4 Windows AcqKnowledge3.9 Mac
Always duplicate waveform!!
Specialized Analysis package included
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Controlling the Display Vertical Scaling
Autoscaling
Horizontal Scaling
Scrolling vs. Autoplot
Zoom Tool
Display Modes
Chart mode, Scope mode,
X/Y plot, Stacked Plot
Hiding and DisplayingChannels
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Filters: Role of coefficients in FIR filters
Original data
FIR 35Hz LP coefficients = 4
FIR 35Hz LP coefficients = 22
Frequency response for FIR 35Hz LPwith 4 coefficients:
Frequency response for FIR 35Hz LPwith 22 coefficients:
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Filters: Performance of FIR filters vs. IIR filters
Original data
FIR 35Hz LP coefficients = 22
IIR 35Hz LP
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Online Resources Application notes
Knowledge base
Product Resources tab
Publications
http://www.biopac.com/ApplicationNotes.asphttp://www.biopac.com/ApplicationNotes.asphttp://www.biopac.com/ApplicationNotes.asphttp://www.biopac.com/FAQs.asp