IEC 60068-3-11:2007 Environmental testing - Part 3-11: Supporting documentation and guidance - Calculation of uncertainty of conditions in climatic test chambers
This part of IEC 60068 demonstrates how to estimate the uncertainty of steady-state
temperature and humidity conditions in temperature and humidity chambers. Since this is
inextricably linked to the methods of measurement, these are also described.
This standard is equally applicable to all environmental enclosures, including rooms or
laboratories. The methods used apply both to temperature chambers and combined
temperature and humidity chambers.
This standard is meant to help everyone using climatic test chambers. Those already familiar
with uncertainty of measurement will find it useful for guidance on typical sources of
uncertainty and how they should be quantified and combined. It is also intended to assist the
first-time or occasional user who has little or no knowledge of the subject.
To discuss uncertainty, it is important first to understand what is being measured or
characterized. The calibration or characterization of the performance of a chamber is
concerned with the humidity and temperature of the air in the chamber, as experienced by the
item under test, at a given set point. This should not be confused with characterizing or
calibrating the chamber sensor, which is a separate matter.
IEC 60068-3-11:2007 history
2007IEC 60068-3-11:2007 Environmental testing - Part 3-11: Supporting documentation and guidance - Calculation of uncertainty of conditions in climatic test chambers