Calibration Variance
Sensor output deviation represents a residual error remaining after the application of a primary gain coefficient. Scale factor instability describes this temporal fluctuation where the slope of the input versus output transfer function shifts across environmental cycles. It measures the change in sensor sensitivity relative to the nominal ratio.
The threshold for this variance remains defined by the application requirements of the inertial navigation system or the specific pressure transducer range.
Sensitivity Drift
Thermal cycling and mechanical stress induce shifts in the internal resistive or capacitive elements that dictate device output. Scale factor instability emerges when these physical components expand or contract beyond their elastic recovery point during operation. Internal reference voltages also degrade over time through ionizing radiation or simple material aging.
Manufacturers report this behavior as a coefficient of variation across a stated temperature gradient. Control loops must account for such movement to prevent cumulative navigational errors.
Measurement Integrity
Precision depends on the ability of the electronics to resolve minute differences in signal magnitude against the noise floor. Scale factor instability degrades the accuracy of the system by injecting a variable multiplier into the raw data stream. Signal processing algorithms attempt to compensate for this uncertainty through periodic re-zeroing or by cross-referencing auxiliary inputs.
Constant monitoring allows for the identification of excessive degradation that falls outside the manufacturer tolerance.
Performance Constraint
Operational limits dictate the maximum allowable divergence before a component requires recalibration or replacement. Scale factor instability identifies the boundary at which a high-precision sensor ceases to provide reliable data for flight or industrial control. Data validity depends on the stability of the gain characteristic relative to the baseline calibration.
Uncorrected shift in this parameter results in divergence between the calculated state and the physical reality of the environment.
