Burn in Hours That Remove the Steepest Early Drift
Thermal burn-in under active electrical bias removes early non-linear drift, locking in long-term calibration stability before sensors reach the field.
Thin Film Platinum Rtd Stability
Resistance Constancy
Resistance constancy over extended thermal exposure defines the operational baseline performance of micro-deposited platinum temperature sensing elements. Maintaining high thin film platinum rtd stability requires minimizing platinum grain boundary growth, substrate diffusion and protective passivation cracking under continuous thermal stress. This performance metric ensures consistent resistance-temperature relationships over years of field deployment.
The scope of this stability metric covers long-term resistance drift, excluding dynamic thermal response time limits.
Film Degradation
Microscopic thin films of platinum sputtered onto ceramic substrates experience grain growth and recrystallization when operated at elevated temperatures. High thermal energy allows platinum atoms to migrate across grain boundaries, reducing film sheet resistance over time. Concurrently, substrate impurities such as silicon or iron can diffuse into the platinum layer, contaminating the metal matrix and altering the temperature coefficient of resistance.
Protective glass passivation layers must seal the metal film against oxidation while matching its thermal expansion coefficient to prevent micro-cracking.
Measurement Drift
Subtle shifts in thin-film lattice structure introduce offset errors into temperature measurement circuits. High thin film platinum rtd stability prevents calibration degradation, avoiding false temperature readings in critical process control applications.
Standard Verification
International metrological standards specify maximum allowable resistance drift limits following thousands of hours at maximum rated temperature. Standardized testing protocols require periodic ice-point resistance measurements to track long-term zero drift. Qualification certificates document drift rates in ohms per year to confirm compliance with tolerance classes.