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Lecture 1 01-1

Lecture 1 01-1 - • We use computers instead of...

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Lecture 1 01/08/08 Bioinstrumentation Oscilloscope – measures voltage 1. Vertical gain (range) sensitivity (y – axis) 2. Horizontal gain (time base) sweep speed you record over Electromagnetic Field (EMFs) (electricity floating in air) Measure biological event electrically Take nerve Boost/amplify signal Measure biological event mechanically: Muscle contraction x = change in length – shortening To take a mechanical event and change it to an electrical event to measure with oscilloscope, use a transducer
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Transducer – converts signal ( x) into voltage you need to calibrate the transducer. To do this, use ruler, string, move it up and down, measure
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Unformatted text preview: • We use computers instead of oscilloscope Problem: Digital take discreet sample, real life is analog (continuous event) Solution: take more samples closer to reality Powerlab has A to D converter Electrical noise • Filter to get rid of noise 1.) Band pass – speakers 2.) AC Couple – sets nonchanging or slowly changing signals to zero 3.) DC Couple – allow signal through unchanged • Use: AC couple fast events (Action potentials) DC couple slow events (transducers) Grounding to reduce noise • Advantages: 1.) Decreases stimulus artifact 2.) Decreases noise less noise...
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Lecture 1 01-1 - • We use computers instead of...

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