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Nor1228 Free-field Microphone

High-level free-field measurement microphone.

Overview

The Nor1228 is a 1/2" free-field condenser measurement microphone engineered for high sound pressure level environments. With a maximum capability exceeding 150 dB peak, the Nor1228 enables accurate measurement of intense noise sources that would overload standard microphones, making it indispensable for industrial, military, and impulsive noise applications where extreme sound levels are encounte…

Key Features

  • Maximum sound pressure level capability exceeding 150 dB peak
  • Optimized for high-level industrial and impulsive noise environments
  • IEC 61094-4 Class 1 free-field accuracy
  • 1/2" diameter compatible with all Norsonic preamplifiers
  • Lower sensitivity design extends upper measurement limit
  • Robust construction for demanding industrial environments
  • 200 V externally polarized for measurement stability
  • Individual calibration with traceable sensitivity certificate

Applications

  • High-level industrial noise measurement near heavy machinery
  • Impulsive noise assessment from pile driving and blasting
  • Turbine hall and compressor station noise monitoring
  • Close-proximity jet engine and aircraft noise measurement
  • Military and weapons testing noise assessment
  • Large industrial fan and ventilation system measurements

Technical Specifications

  • Size: 1/2"
  • Max Level: > 150 dB peak
  • Sensitivity: Lower for high-level use

Frequently Asked Questions

  • What levels can the Nor1228 measure?
    The Nor1228 can measure peak sound pressure levels exceeding 150 dB, making it suitable for the most demanding high-level noise environments including turbine halls, compressor stations, blasting operations, and impulsive sources. Standard microphones typically clip at around 140-146 dB peak.
  • Why does the Nor1228 have lower sensitivity than standard microphones?
    The Nor1228 uses a stiffer, lower-sensitivity diaphragm to extend the upper measurement limit beyond 150 dB. This is a deliberate design choice: higher maximum level requires lower sensitivity. This means the noise floor is higher than the Nor1225 or Nor1227, so the Nor1228 is specifically intended for high-level measurements, not quiet environments.
  • When should I choose the Nor1228 over the Nor1225?
    Choose the Nor1228 when you regularly measure sound levels above 140 dB peak, such as near heavy industrial machinery, during blasting operations, or for impulsive noise sources. For typical environmental and occupational noise measurements below 140 dB, the Nor1225 provides better sensitivity and lower noise floor.

Application Guide

The Nor1228 Free-field Microphone belongs to the Norsonic Microphones range. See the Microphones application guide for system configuration, compatible accessories, and applicable measurement standards.

Related Norsonic Products

Why Norsonic?

  • Manufactured in Norway — decades of acoustic measurement heritage; all instruments designed and built in Norsonic AS, Lierskogen, Norway
  • IEC 61672 Class 1 — highest accuracy class for professional and regulatory acoustic measurement
  • International type approvals — PTB (Germany) and LNE (France); accepted by environmental authorities across the region
  • 3-year manufacturer warranty — covers parts and labour; Norsonic Asia authorized service center support throughout the region
  • Open data formats — .nox files work with NorReview and can be exported to CSV, Excel, and third-party analysis software

Calibration and Compliance

  • All Norsonic instruments require periodic IEC 61672-3 calibration — Norsonic Asia provides factory-authorized calibration services with full DANAK-traceable certificates
  • Calibration interval: 1 year for ISO 17025 accredited laboratories; 2 years for field instruments in non-accredited applications
  • Field calibration check: use an IEC 60942 Class 1 sound calibrator (94 dB or 114 dB) before and after each measurement session
  • Loaner instruments available during calibration to minimize project downtime — contact Norsonic Asia for loaner availability

Availability & Regional Support

Available from Norsonic Asia — the factory-authorized distributor for ASEAN, GCC, and South Asia. Instrument supply includes 3-year manufacturer warranty, factory-authorized calibration services, operator training, and after-sales technical support.

  • Typical lead time: 3–6 weeks from order confirmation (ex-factory Norway)
  • Countries served: Singapore, Malaysia, Thailand, Vietnam, Philippines, Indonesia, UAE, Saudi Arabia, Qatar, Kuwait, India, Bangladesh, Sri Lanka, and more
  • Technical support: English and Arabic; response within 1 business day

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