Pendulous Deviation
Accelerometer sensitivity to transverse mechanical oscillations defines the vibro-pendulous error. This phenomenon occurs when a rectified output appears in the signal path due to the non-linear interaction between mass displacement and external vibration. High frequency components drive the seismic mass away from its null position, creating a cross-axis sensitivity that the internal circuitry interprets as a constant acceleration bias.
Mechanical Coupling
Internal assembly alignment dictates the magnitude of the measured bias. Manufacturers mitigate this effect by balancing the mass with absolute symmetry around the pivot point to cancel out moments generated by acceleration in orthogonal planes. Engineers define the limit of this compensation in terms of output voltage per unit of squared vibration frequency.
Calibration Metric
Laboratories isolate the unwanted signal by applying known sinusoidal excitation to the sensor during testing at reference temperatures. Researchers calculate the error coefficient by measuring the resulting rectified direct current offset across a sweep of vibration amplitudes. Discrepancies between the predicted output and the recorded bias indicate the degree of physical misalignment in the pivot mechanism.
Operational Boundary
Systematic errors arise when the environment exceeds the design frequency range of the instrument. Precise tracking of the proof mass relies upon a rigid suspension system that loses effectiveness under extreme resonance. Periodic re-certification verifies the stability of the zero-bias against these specific mechanical stressors.
