Nor1203 1/2" Insert Voltage Preamplifier
Insert voltage preamplifier for 1/2" measurement microphones.
Overview
The Nor1203 is a precision 1/2" insert voltage preamplifier engineered to provide the critical interface between condenser measurement microphones and sound level meters or analysis systems. With an exceptionally low self-noise of less than 2.5 µV and an input impedance exceeding 10 GΩ, the Nor1203 preserves the full sensitivity and dynamic range of externally polarized 1/2" microphones, ensuring …
Key Features
- Ultra-low self-noise < 2.5 µV for high-sensitivity measurements
- High input impedance > 10 GΩ preserves microphone sensitivity
- Wide frequency response from < 1 Hz to > 200 kHz (-3 dB)
- IEEE 1451.4 TEDS compatible for automatic microphone identification
- Insert voltage technique for in-situ electrical calibration
- Compatible with all standard 1/2" IEC 61094-4 condenser microphones
- Robust stainless steel construction with gold-plated contacts
- 200 V polarization voltage supply for externally polarized microphones
Applications
- Standard sound level measurement with Norsonic and third-party meters
- Environmental noise monitoring per ISO 1996 and IEC 61672
- Building acoustics testing per ISO 16283 and ISO 3382
- Laboratory reference measurements and calibration verification
- Industrial noise assessment and machinery diagnostics
- Infrasound and ultrasonic measurement applications
Technical Specifications
- Input: 1/2" microphone
- Noise: < 2.5 µV
- Impedance: > 10 GΩ
- TEDS: IEEE 1451.4 compatible
Frequently Asked Questions
- What is TEDS?
TEDS (Transducer Electronic Data Sheet) per IEEE 1451.4 is a standardized method for storing microphone calibration data, serial number, and sensitivity in a small memory chip within the transducer. When connected, the instrument automatically reads the TEDS data and configures itself with the correct sensitivity and calibration values, eliminating manual entry errors. - What is the advantage of insert voltage calibration?
Insert voltage calibration allows you to verify the electrical gain of the entire measurement chain from the preamplifier input through to the analyser output, without physically removing the microphone. A known voltage is injected at the preamplifier input, enabling traceable in-situ calibration checks that complement acoustic calibrator verification. - Which microphones are compatible with the Nor1203?
The Nor1203 is compatible with all standard 1/2" externally polarized condenser microphones conforming to IEC 61094-4, including Norsonic models Nor1225, Nor1227, Nor1228, and Nor1229, as well as equivalent microphones from other manufacturers. It also supports prepolarized microphones when no polarization voltage is applied.
Application Guide
The Nor1203 1/2" Insert Voltage Preamplifier belongs to the Norsonic Microphones range. See the Microphones application guide for system configuration, compatible accessories, and applicable measurement standards.
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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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