Acoustic Calibration Systems: IEC 61672 Measurement Traceability for Asia

The Nor1525 calibration system provides a complete acoustic calibration chain for verifying Norsonic sound level meters to IEC 61672 Class 1 — essential for ISO 17025 accredited test laboratories, government regulatory agencies, and any measurement that must withstand legal scrutiny. Norsonic Asia provides factory-authorized calibration services across ASEAN, GCC, and South Asia.

Why Acoustic Calibration is Mandatory

IEC 61672-3 requires periodic pattern evaluation — without current calibration, the instrument's Class 1 designation is invalid
IEC 61672 Class 1 field use requires acoustic calibration check before and after each measurement session using a sound calibrator
ISO 17025 laboratory accreditation mandates fully traceable calibration records for all measurement equipment
Regulatory noise measurements (environmental, occupational, type-approval) are legally invalidated without current calibration certificates
Microphone sensitivity drifts over time and with humidity/temperature cycling — calibration detects sensitivity changes greater than 0.1 dB
Calibration intervals: typically 1 year for accredited labs, 2 years for field instruments used in non-accredited applications

Nor1525 System Components

Reference microphone — primary calibration standard with DANAK-traceable sensitivity certificate
Pistonphone calibrator — 250 Hz, 114.0 dB SPL ± 0.05 dB reference source (IEC 60942 Class LS)
Sound level calibrator — 1 kHz, 94.0 dB and 114.0 dB dual-level field calibration (IEC 60942 Class 1)
Calibration software — automated calibration chain verification, sensitivity logging, and traceable certificate generation
Complete system provides end-to-end traceability: microphone → calibrator → reference → national standard

Factory-Authorized Calibration Services

Norsonic Asia provides factory-authorized periodic calibration for all Norsonic instruments in the region
IEC 61672-3 type evaluation — comprehensive pattern evaluation at periodic intervals
IEC 60942 calibrator verification — checks your field calibrator's reference level to ± 0.05 dB
Full calibration certificate with traceability chain to DANAK (Denmark) national laboratory
Calibration turnaround: 7–14 working days; express service available
Loaner instruments available during calibration to minimize project downtime

Applicable Standards

IEC 61672-1: Class 1 and Class 2 sound level meter performance specification
IEC 61672-3: Periodic tests for sound level meters
IEC 60942: Class LS, Class 1, and Class 2 sound calibrators
ISO 17025: General requirements for competence of testing and calibration laboratories
ISO 1996-1/2: Environmental noise measurement requiring traceable calibration

Who Needs Calibration Services

ISO 17025 accredited acoustic test laboratories — annual calibration required
Environmental consulting firms — regulatory submissions require valid calibration
Government agencies and enforcement bodies — legal defensibility of measurements
Universities and research institutions — calibration for peer-reviewed measurement data
Contractors with noise monitoring obligations — calibration certificates for authority reporting

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