The highly controlled platinum thin film manufacturing process of the PTS assures exceptional stability of temperature characteristics resulting in long term reliable operation even under harsh environments. The maximum resistance R0 drift specification for the PTS after 1000 hours at the peak operating temperature of +155°C is less than ±0.04%. Figure D shown here shows the test results from a 1000 W PTS 1206 package size. In this particular case the performance is much better than the maximum specified stability.