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2.2. Relative Humidity Sensor Accuracy

To determine the accuracy of a relative humidity sensor, it is placed in a temperature and humidity controlled

chamber. The temperature is set to a convenient fixed value (typically 30 °C) and the relative humidity is swept

from 20 to 80% and back to 20% in the following steps: 20% – 40% – 60% – 80% – 80% – 60% – 40% – 20%. At

each set-point, the chamber is allowed to settle for a period of 30 minutes before a reading is taken from the

sensor. Prior to the sweep, the device is allowed to stabilize to 50%RH. The solid top and bottom (blue) trace in

Figure 2, “Measuring Sensor Accuracy Including Hysteresis,” shows the result of a typical sweep after non-linearity

compensation.

Figure 2. Measuring Sensor Accuracy Including Hysteresis