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Select the most appropriate option to fill in the blanks. Repeatability is the closeness of agreement among a number of consecutive measurements of the same measurand carried out under the same operating conditions, over a _____ interval of time.
long
short
indefinite
variable
short
Repeatability is a measure of the precision of an instrument under identical operating conditions. It refers to the closeness of agreement between consecutive measurements performed by the same observer, using the same instrument, in the same location, over a short time interval.
ISO 5725-1:1994
Repeatability is a measure of the precision of an instrument under identical operating conditions. It refers to the closeness of agreement between consecutive measurements performed by the same observer, using the same instrument, in the same location, over a short time interval.
╧Г=nтИТ1тИСi=1nтАЛ(xiтАЛтИТx)2тАЛтАЛ тАФ the standard deviation used to quantify repeatability where x is the mean of measurements.
The principle relies on minimizing external variables that could introduce drift, such as temperature fluctuations, supply voltage variations, or mechanical wear. By keeping the time interval short, the environmental and internal instrument states remain essentially constant, allowing the inherent random error to be quantified.
Repeatability is often expressed as the standard deviation of multiple measurements.
It is a static characteristic of measuring instruments.
Distinguish from 'Reproducibility', which involves different conditions, operators, or times.
Short time intervals eliminate the effect of drift.
Provides a baseline for instrument precision.
Allows assessment of random errors within the system.
Does not account for long-term drift or calibration shifts.
Sensitive to environmental noise if not controlled.
Calibration verification of industrial sensors.
Quality control in manufacturing processes.
Benchmarking laboratory equipment accuracy.
Long time intervals introduce 'drift', which shifts the measurement from repeatability to reproducibility or stability.
Option A is incorrect because long intervals introduce drift.
Option C and D are incorrect as they do not specify the constraint necessary to isolate random error from environmental changes.
B is correct тАФ Repeatability requires a short time interval to ensure that experimental conditions remain constant and drift is excluded.
Always remember the mnemonic: Repeatability = Same conditions/Short time; Reproducibility = Different conditions/Longer time.
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