Instrument Characteristics. Scientific Instrument: A device for making a measurement. Measurement: An action intended to assign a number as the value of a physical quantity in stated units.
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No instrument will perfectly indicate the “true” quantitative aspect of the phenomenon.
Therefore, no statement of the result of a measurement is complete unless it includes an estimate (necessarily in statistical terms) of the probable magnitude of the uncertainty. The uncertainty is the interval within which the true value of a quantity can be expected to lie with a stated probability.
A dew point hygrometer, which responds non-linearly to humidity, is also highly sensitive in the low humidity range but decreasingly so in the higher hujidity range. Its low humidity sensitivity makes it very suitable for upper-air soundings of humidity.
The property of the result of a measurement or the value of a standard whereby it can be related to stated references, usually national and/or international standards through an unbroken chain of comparisons all having stated uncertainties.
Thus, when elapsed time, (t), equals the timeresponse of the instrument, (l), then the amount of change that yet needs to occur, (x - xI), is equal to 37% of the total change, (x0 - xI); Or, 63% of the change has occurred when t = l.