Neometrix head-impact test rig standardizes HIC calculation

Neometrix's head-impact test rig integrates a triaxial accelerometer, charge amplifier, anti-alias filter, and 16-bit ADC into a single signal chain [Neometrix][Dev.to]. The rig mounts a ±2000 g accelerometer at the headform centre of gravity, preserving the CG by using a sub-gram adapter. The charge amplifier delivers <0.1 % linearity and a bandwidth of DC-10 kHz. A 4th-order Butterworth anti-alias filter is set to 1650 Hz, matching SAE J211 channel-class 1000 requirements [Neometrix]. The ADC samples at ≥10 kHz with 16-bit resolution, and the DAQ timestamps each sample to ±10 µs. Firmware applies a zero-phase forward-backward filter before feeding the data to a Python routine that computes HIC over the 0.036 s interval mandated by ECE 22.06 [Dev.to]. The software also reports peak resultant acceleration and flags pass/fail against the 275 g peak-g limit and 2400 HIC ceiling. By hard-coding the SAE J211 filter parameters, the rig eliminates the common source of variance where teams apply ad-hoc filters or different sampling rates. This results in reproducibility across labs, compliance automation, and higher data quality for model validation. The integrated pipeline generates a standards-compliant HIC value and a pass/fail flag in real time, cutting the manual spreadsheet step that typically introduces rounding errors and audit headaches [Neometrix]. The 10 kHz sampling and ±10 µs timestamp accuracy capture high-frequency content that lower-rate setups miss, providing richer datasets for finite-element head-model calibration [Dev.to].