What is Sensitivity Variation from RT over Temp.?
Sensitivity variation from RT over Temp. is the change in the sensitivity from the room temperature sensitivity as the temperature changes. The variation is measured at Kionix by placing the accelerometer in a thermal chamber. First, the sensitivity is measured at 25C. Then the chamber is heated to a high temperature (usually 85C), and the sensitivity is measured a second time. Finally, the chamber is cooled to a low temperature (usually -40C), and the sensitivity is measured a third time. After the testing is complete, the data is analyzed. The sensitivity at 25C is subtracted from each of the measurements. The resulting change in sensitivity is divided by the accelerometer’s sensitivity at 25C to express the change in output in terms of percentage change. The three data points (high temp., 25C, and low temp.) are plotted on a graph, and a least squares linear fit is done. The resulting slope (expressed in %/C) gives the variation of the sensitivity from room temperature (25C) over te
