By Mary Johnson, Wavelength Electronics, Inc.
Understanding how a temperature stability specification is determined allows you to predict how the controller will perform in your system. Typically, a controller manufacturer will give temperature stability specifications over one hour and stability over 24 hours. Stability is how close the actual load temperature stays to the setpoint temperature over time. There are several caveats to the testing that can only be exposed by understanding the test protocol as it compares to your application.