SI7013-A10-IM1 Ver la hoja de datos (PDF) - Silicon Laboratories
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SI7013-A10-IM1 Datasheet PDF : 46 Pages
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Si7013-A10
4.1. 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 25–30 °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 60 minutes before a reading is taken from the
sensor. Prior to the sweep, the device is allowed to stabilize to 50%RH. The solid trace in Figure 9 shows the result
of a typical sweep.
Figure 9. Measuring Sensor Accuracy Including Hysteresis
The RH accuracy is defined as the dotted line shown in Figure 9, which is the average of the two data points at
each relative humidity set-point. In this case, the sensor shows an accuracy of 0.25%RH. The Si7013 accuracy
specification (Table 4) includes:
Unit-to-unit and lot-to-lot variation
Accuracy of factory calibration
Margin for shifts that can occur during solder reflow
The accuracy specification does not include:
Hysteresis (typically ±1%)
Effects from long term exposure to very humid conditions
Contamination of the sensor by particulates, chemicals, etc.
Other aging related shifts ("Long-term stability")
Variations due to temperature
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Rev. 1.0
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