ISO 5347-18:1993

Overview

ISO 5347-18:1993 - Methods for the calibration of vibration and shock pick-ups, Part 18: Testing of transient temperature sensitivity - specifies instrumentation and procedures for measuring the transient output of piezoelectric pick-ups when subjected to a sudden temperature change. The standard defines test conditions, apparatus requirements and the method for calculating transient temperature sensitivity (Stls), expressed in SI units (metres per second squared per degree Celsius, m/(s²·°C)).

Key topics and requirements

• Scope: Applies specifically to piezoelectric vibration and shock pick-ups; measures output caused by sudden immersion or rapid temperature change.
• Apparatus:
  • Water or alcohol bath maintained to be 20 °C ± 1 °C lower than the pick-up’s actual temperature; bath volume controlled so immersion causes ≤ 1 °C rise.
  • Aluminium mounting block with mass ≈ ten times the pick-up; pick-up attached by normal mounting means.
  • D.C. oscilloscope or recorder with gigaohm input impedance for direct measurement.
  • Recommended preamplifier (if normally used) and other supporting equipment; room temperature maintained at 23 °C ± 3 °C.
  • Precautions to prevent bath liquid ingress, connector leakage or lowered electrical leakage resistance.
• Procedure:
  • Connect pick-up directly to oscilloscope/recorder if possible; if an amplifier is normally used, repeat test with the amplifier set to its lowest frequency range and record low-frequency cut-off.
  • Quickly immerse the pick-up (mounted on the aluminium block) into the bath and record the maximum output and the time from immersion start to peak.
  • If the output reverses polarity within the first two seconds and reaches an opposite peak, record that magnitude as well.
• Results:
  • Calculate transient temperature sensitivity (Stls) from the change in pick-up output (expressed as acceleration) divided by the temperature change (°C). Be is defined as the temperature difference before and after immersion.

Applications

• Calibration and metrology laboratories performing environmental sensitivity verification of accelerometers and piezoelectric sensors.
• Sensor manufacturers validating transient thermal performance during design and production.
• Test engineers in aerospace, automotive, industrial vibration monitoring and structural health monitoring where transient temperature events can affect measurement accuracy.
• Quality assurance and certification bodies requiring standardized temperature-sensitivity data for vibration/shock transducers.

Who should use this standard

• Calibration labs, instrument manufacturers, test houses, R&D teams, and quality departments working with piezoelectric accelerometers and vibration/shock pick-ups.

Related standards

• ISO 5347 series (Parts 0–20) - includes Part 17: Testing of fixed temperature sensitivity, Part 13: Base strain sensitivity, Part 15: Acoustic sensitivity, Part 20: Primary vibration calibration by reciprocity, etc. Use ISO 5347-18 alongside other parts for a comprehensive calibration program.

Keywords: ISO 5347-18, transient temperature sensitivity, piezoelectric pick-ups, accelerometer calibration, vibration and shock sensor testing, temperature sensitivity testing.