The two most common terms, accuracy and repeatability, and are often used interchangeably. In fact, accuracy and repeatability are unrelated. A system can be very accurate but not very repeatable, or vice-versa. So, if we command a rack and pinion system to travel mm, its accuracy is determined by how closely it achieves mm of motion.
But how accurate is it? Updated on Sept. Accuracy — designates how close a measured value is to the true quantity of what is being measured. Without comparison to a standard, accuracy cannot be determined. Repeatability — describes how well a system or device can reproduce an outcome in unchanged conditions.
In some applications, repeatability is more important than accuracy. If the system is repeatable, an error can be mapped and compensated for.
Resolution — is the smallest increment the system can display or measure. A system can have a high resolution with poor repeatability and accuracy. Resolution is a primary concern in applications regarding speed control or surface finish.
Want to learn more? Contact us today. Related resources and news. Read more ». New Encoder Modules Ideal for Robotics. View more. Sign up for our e-newsletter Stay up to date with the latest news, application stories and products. For repeatability to be established, the following conditions must be in place: the same location; the same measurement procedure; the same observer; the same measuring instrument, used under the same conditions; and repetition over a short period of time.
Reproducibility, on the other hand, refers to the degree of agreement between the results of experiments conducted by different individuals, at different locations, with different instruments. Put simply, it measures our ability to replicate the findings of others. Through their extensive research, controlled inter-laboratory test programs are able to determine reproducibility. The article Precise Low Temperature Control Improves Reaction Reproducibility discusses the challenges related to reproducibility in more detail.
Yet if your results differed greatly, you would probably conclude that your findings were inaccurate, leading you on to further investigations.
As such, repeatability and reliability imbue investigative findings with a degree of authority. We can also use repeatability and reliability to measure difference and a lack of correlation.
If, for instance, we are unable to repeat or reproduce our findings, we have to ask ourselves why, and to investigate further. ACG, world leading suppliers of fully integrated solutions to the global pharmaceutical and nutraceutical industry, is rebranding with a commitment to Celebrating World Science Day, Nov 10 has seen renewed calls for more young people to follow careers in science and technology to help tackle International life sciences equipment company Eppendorf, headquartered in Hamburg, Germany, has completed its conversion to the European Quell Therapeutics has expanded operations to develop and scale production of its multi-modular engineered Treg cell therapies for clinical trials at In This Edition Articles - Advancements in Freeze drying production and the impacts on scale, sustainability and compliance - Face-to-face events finally start up - But how will attendance f News section.
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