Overview
ISO 8042:1988 - "Shock and vibration measurements - Characteristics to be specified for seismic pick-ups" defines the information manufacturers should provide about electro‑mechanical seismic pick-ups (vibration sensors/accelerometers) whose electrical outputs are known functions of uniaxial, multiaxial or angular accelerations, velocities or displacements. Published by ISO/TC 108 in 1988, the standard is a guide to ensure consistent presentation of sensor characteristics so users can select, specify and apply pick‑ups reliably.
Key topics and technical requirements
ISO 8042 lays out the properties and data that should be declared for each pick‑up. Major items include:
- Type and motion: whether output is proportional to displacement, velocity or acceleration; uniaxial, multiaxial or angular responses.
- Sensing element and orientation: description of sensing technology (e.g., piezoelectric, capacitive, strain‑gauges) and sensitive direction marking.
- Mechanical details: overall dimensions, material, mass & centre of gravity, moment of inertia (for angular sensors), mounting method and torque recommendations.
- Electrical/interface information: nature of output (voltage, charge, modulated carrier, frequency‑modulated), energy source or biasing, wiring diagrams and recommended termination/impedance.
- Performance data: measurement range, rated sensitivity and calibration uncertainty, frequency range and resonance(s), phase shift vs. frequency, damping (Q or log decrement), linearity, hysteresis, transverse sensitivity and limits for maximum motion without damage.
- Electrical impedance: magnitude and phase (or equivalent RLC values) across frequency.
- Environmental effects: operating/storage temperature and humidity ranges, thermal transients, electromagnetic and acoustic disturbance sensitivity, magnetic field effects, base‑strain sensitivity and radiation exposure limits where applicable.
- Auxiliary equipment: requirements for amplifiers, demodulators, filters, bias supplies, impedance converters, and any specified input impedance.
Practical applications and users
ISO 8042 is valuable for:
- Sensor manufacturers preparing datasheets and product literature.
- Test engineers and vibration analysts selecting accelerometers and seismic pick‑ups for test rigs, modal analysis, structural health monitoring and shock testing.
- Calibration laboratories performing calibrations (helps with centrifuge and multiaxial calibration needs).
- Procurement and specifications teams writing performance requirements for vibration measurement systems.
- R&D and compliance groups ensuring compatibility between pick‑ups and auxiliary electronics.
Keywords: ISO 8042, seismic pick‑ups, shock and vibration measurements, accelerometer specifications, sensitivity, frequency response, environmental effects.
Related standards
- ISO 2041 - Vibration and shock - Vocabulary
- ISO 5347 - Methods for the calibration of vibration and shock pick‑ups
- ISO 5348 - Mechanical mounting of accelerometers
ISO 8042 complements these references by specifying the characteristic data users should expect for reliable sensor selection and application.