Once these basic checks confirm the device is operational and that a more systemic RH accuracy issue is present, the following diagnostic questions can help scope the problem and guide further root-cause analysis:

1. Is the RH error observed across all devices or only a subset?
2. Are all affected sensors from a specific lot or production group?
3. Are the accuracy errors static, intermittent, or progressively worsening over time?
4. Is the RH sensor reporting the right temperature result?
5. What form does the RH error take? Is there a consistent positive offset, a negative gain, or a combination of behaviors?
6. At what stage in the development or production process do the RH errors first appear?
7. What is the sensor’s end-use environment? For example:
   1. Are sensors used indoors, outdoors, or in industrial environments?
   2. What temperature ranges are involved? What humidity ranges?
   3. Are sensors exposed to fluctuating humidity or relatively stable conditions over time?
   4. Does the ambient air to be sensed actually reach the RH sensor?
   5. Does the system allow for RH to stabilize?

Answers to the above questions allows the user to navigate through the Figure 4-11 in Section 4.8. This flowchart is intended as a guide to help users navigate to where their RH error source is coming from and allow for a faster debugging process. Once the user has identified the likely area of concern, navigate to the appropriate topic in Section 4.