![]() Wind sports widget for allMETEO weather stationsĪirport runway wind widget for allMETEO weather stations How to add a Wifx L1 LoRaWAN Gateway to TTN/TTI, The Things Network v3 Stack Wifx L1 LoRaWAN Gateway Outdoor Installation Guide It is the result of extensive sensor testing in steady state conditions, where for example, the liquid temperature is held constant in a well insulated container and the sensor is allowed plenty of time to equalize with the liquid media being measured before a reading is taken. In technical terms it is the two standard deviations or 2σ (two sigma) variation. The sensor datasheet uncertainty (or probable error of measurement) is also called the 95% uncertainty. Yet despite this, we do find that variation still occurs and there are other factors like the sensor time constant τ (tau) 63.2% that can shift and expand the sensor uncertainty in many applications like atmospheric and climatic air temperature measurement. This ensures that manufacturers and scientists are all on the same page when specifying sensor uncertainty. Now the actual determination of the ☐.5☌ is quite a bit more mathematical and is calculated using standard deviation equations which are based on scientific and mathematical methods that have been standardized world wide. So if the 95 measurements fall into a range of plus 0.5 ☌ and minus -0.5 ☌ away from the 100 measurement mean, than the sensor uncertainty as written in the data sheet will be ☐.5 ☌. In simple terms, measurement uncertainty as stated in a datasheet is taken as the range of the 95 closest measurements to the average (mean) of 100 measurements. How is sensor datasheet uncertainty determined? Measurement error is made up of not only the sensor deviation but is also influenced by the speed of change of the property being measured versus the sensor’s ability to react in time to these chances, and this is where things can get very complicated. All sensors produce measurement error, even the ones used to determine the reference temperature. The hard part is determining the actual air temperature so that one can calculate the sensor error. ![]() When measuring atmospheric air temperature, it is the sensor reading minus the actual air temperature. QUESTION: What is the difference between sensor measurement error and the sensor uncertainty as published in a sensor’s datasheet?ĪNSWER: Sensor error is the is the deviation of the measured value from the actual value of the property being measured.
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