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Fill in the blanks: Repeatability is defined as the ability of an instrument to give the _____ output for repeated applications of _____ input value under the same environmental conditions.
same, same
different, same
same, different
variable, variable
same, same
Repeatability is a measure of the precision of an instrument. It defines the closeness of agreement between consecutive measurements of the same input value carried out under identical operating conditions over a short interval of time.
ISO 5725-1: Accuracy (trueness and precision) of measurement methods and results
Repeatability is a measure of the precision of an instrument. It defines the closeness of agreement between consecutive measurements of the same input value carried out under identical operating conditions over a short interval of time.
R=x┬▒n╧Г тАФ where x is the mean value and ╧Г is the standard deviation
RepeatabilityтЙИFull┬аScale┬аOutputMaximum┬аDeviationтАЛ├Ч100%
It is quantified by the standard deviation of multiple readings. If an instrument is highly repeatable, the variance in output for a constant input is negligible. It reflects internal random errors like friction, thermal noise, or backlash within the sensing element.
Repeatability is synonymous with precision but not accuracy.
It assumes fixed environmental conditions (temperature, pressure, supply voltage).
High repeatability implies that random errors are minimized.
It is usually expressed as a percentage of the full-scale range.
Ensures consistency in repetitive control processes
Essential for calibrating measurement equipment
Does not account for systematic errors (accuracy)
Can degrade over time due to component aging or mechanical wear
Industrial process controllers
Laboratory weighing scales
Sensor calibration systems
Option B is incorrect because different outputs for the same input indicate random error or poor precision.
Option C is incorrect because the same output for different inputs signifies a lack of sensitivity.
Repeatability is the capability of the instrument to reproduce the same output.
A is correct тАФ Repeatability requires the instrument to produce the same output for repeated applications of the same input under constant conditions.
Always distinguish between 'Repeatability' (short-term, same conditions) and 'Reproducibility' (long-term, potentially different conditions/operators).
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