Lecture 1 01-1

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

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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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This note was uploaded on 07/21/2008 for the course BIPN 105 taught by Professor Armour during the Winter '08 term at UCSD.

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

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