BIOE 3270 Lecture Notes - Lecture 3: Data Acquisition, Multimeter, Thermostat
7 Apr 2015
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Document Summary
Selecting instrumentation: great accuracy greater cost, how often will the instrument be used, compatibility of instrument, coupling and signal conditioning. Data acquisition system, temperature logger: selecting an output device. Increases the confidence of measurement: verification of a measured quantity against a standard. If f=f(x1, x2, x3, . xn) and each of these variables has its own error (i. e. x1 !x1, x2 !x2, x3 !x3, . xn !xn) then: Percentage error = (!f/f) x 100 (expressed in %) Precision: repeatability of the output of an instrument, results that are close. Accuracy: closeness of the results to the true/actual/expected value. Least count: the minimum or smallest division that can be read on an instrument, e. g, 10c on a liquid-in-glass thermometer. Resolution the amount of input required to give a detectable output the sluggishness of an instrument sometimes least count and resolution are the same thing. Error: the difference between the measured and the actual value.
