1. Introduction and Measurement Fundamentals

Question 1

Types of Biomed Instruments

Answer 1

1. Diagnostic - acquire info
2. Assistive - make up for loss functionality
3. Therapeutic - control non-normal

Question 2

Types of Inputs

Answer 2

1. Desired - info instruments are designed to isolate / capture
2. Interfering - affect instrument’s ability to get desired inputs (e.g. noise)
3. Modifying - affect performance of instrument (e.g. electrode placement)

Question 3

Compensation

Answer 3

Technique for reducing effect of interfering and modifying inputs

Question 4

Design Principles

Answer 4

1. User Needs
2. Constraints (e.g. cost, safety)
3. Understand body problems

Question 5

Systematic v Random Errors

Answer 5

Systematic: always present, effects every measurement, can be reduced by proper design (e.g. offset on scale)
Random: due to unknown reasons, can be reduced by performing experiment several times

Question 6

Standard Error of Mean

Answer 6

measures how far sample mean is likely to be from true population mean, SD / sqrt (n)

Question 7

Instrument Limit of Error

Answer 7

precision to which a measuring device can be read

Question 8

Least Count

Answer 8

smallest division marked on measurement, ILE < LC

Question 9

Signal v. Noise

Answer 9

Signal: component of variable with info about measured quantity
Noise: component unrelated / unwanted
SNR = 10 log (signal/noise)