Overview
ISO 24637:2009 - Space systems - Electromagnetic interference (EMI) test reporting requirements - defines equipment-level EMI test report content for spaceflight hardware. The standard ensures EMI test reports supply sufficient, reproducible data for subsequent integration and system‑level EMC analysis, and requires augmented reporting when EMI test limits are exceeded. These requirements are especially important when an EMI test limit non‑conformance waiver is requested instead of redesign.
Key topics and technical requirements
- Scope: Applies only to equipment‑level EMI test reports for space systems; focuses on documentation required for integration analysis and waiver justification.
- General report content: Conforms to ISO/IEC 17025 reporting practices and references applicable space EMC test methods. Reports must identify the EUT (model/serial), include a short functional description, and detail operating modes.
- Test setup documentation: Photos, wiring harness schematics (shielding, twisting, grounding/isolation), cabling/connector configurations and any deviations from standard/flight harness configurations.
- Supporting documentation and traceability: Reference to EMI test plan, specifications, “as‑run” procedures, daily test logs, and calibration certificates.
- Signature and location: Names and contact details of EUT product engineer and EMI test engineer, and test site location.
- Measurement system details: Test equipment, software, calibration, antenna factors, antenna distances, LISN/NE transfer functions, transfer impedance of probes, measurement bandwidths, scan speeds, polarizations, compression levels and grounding configuration.
- Reporting resolution and formats: Graphical outputs with frequency resolution (nominally 1%) and amplitude accuracy within 1 dB. Emissions and immunity results presented as amplitude vs frequency or time, superimposed with test limits.
- Emissions specifics: Units and presentation guidance for conducted emissions (dBuV/dBuA), radiated electric field (dBuV/m), magnetic field (dBpT) and DC magnetic cleanliness (360° plots at 1° resolution). Enhanced frequency resolution required for failures above 100 MHz.
- Immunity specifics: Document monitored outputs, degradation criteria, onset of susceptibility, soft vs hard upset, and failure amplitudes per frequency/band. Pulse, lightning and ESD reporting conventions are specified.
Applications and users
ISO 24637:2009 is used by:
- Spacecraft EMI/EMC engineers preparing equipment‑level test reports.
- Test laboratories to ensure reporting completeness and ISO/IEC 17025 alignment.
- Systems integrators and configuration managers performing integration analysis and assessing waiver requests.
- Project quality and compliance teams validating EMI test evidence for flight hardware acceptance.
Practical benefits include improved traceability, reproducibility of EMI tests, clearer basis for non‑conformance waivers, and faster system‑level EMC integration decisions.
Related standards
- ISO 14302 - Space systems - Electromagnetic compatibility requirements
- ISO 15864 - Space systems - General test methods for spacecraft, subsystems and units
- ISO/IEC 17025:2005 - Competence of testing and calibration laboratories
Keywords: ISO 24637:2009, EMI test reporting, space systems, electromagnetic interference, equipment‑level EMI, EMC, EUT, LISN, radiated emissions, conducted emissions, immunity testing.
