This week, we answer a question from a customer who asked how to determine measurement uncertainty when using a humidity sensor (i.e. in an environmental chamber). He says that although measurement uncertainty is not always requested by his clients, who usually accept the unit calibration certificate as sufficient, it is something he wants to be able to provide if asked.
"I'm more concerned with the uncertainty of measurement associated with the results obtained from the units, than the calibration of the unit itself. Do you ever take into account other factors that could influence the measurements obtained from the humidity logger during use, i.e. the stability of the unit itself between calibrations, the ambient temperature, errors associated with the positioning of the device, sufficient flow across the sensor? Or are such factors considered insignificant considering the overall accuracy and do you consider this sufficient justification for ignoring them? "