Nor1205 1/4" Insert Voltage Preamplifier
Insert voltage preamplifier for 1/4" measurement microphones.
Overview
The Nor1205 is a precision 1/4" insert voltage preamplifier specifically designed for use with smaller-diameter measurement microphones that offer extended high-frequency response. With a self-noise below 3 µV and high input impedance, the Nor1205 maintains the superior high-frequency accuracy of 1/4" microphones while providing the signal conditioning necessary for connection to Norsonic sound le…
Key Features
- Optimized for 1/4" condenser measurement microphones
- Low self-noise < 3 µV preserves microphone sensitivity
- Extended frequency response beyond 100 kHz for ultrasonic applications
- Insert voltage technique for in-situ electrical calibration
- Compact form factor maintains 1/4" microphone acoustic advantages
- High input impedance for accurate low-frequency response
- Compatible with IEC 61094-4 compliant 1/4" microphones
- 200 V polarization voltage supply for externally polarized microphones
Applications
- High-frequency acoustic measurements above 20 kHz
- Ultrasonic leak detection in industrial facilities
- Small cavity and coupler pressure measurements
- Automotive NVH testing with extended frequency range
- Aeroacoustic research and wind tunnel measurements
- Precision laboratory microphone calibration
Technical Specifications
- Input: 1/4" microphone
- Frequency: Extended high frequency
- Noise: < 3 µV
Frequently Asked Questions
- When should I use a 1/4" microphone?
Use 1/4" microphones when you need accurate measurements above 10 kHz, particularly in the 20-100 kHz ultrasonic range. The smaller diaphragm diameter provides a more uniform frequency response at high frequencies compared to 1/2" microphones. They are also preferred when the physical presence of the microphone must be minimized to reduce acoustic interference. - Can I use the Nor1205 with a 1/2" microphone?
No, the Nor1205 is specifically designed for 1/4" microphones. For 1/2" microphones, use the Nor1203 insert voltage preamplifier instead. The two preamplifiers have different mechanical interfaces and are not interchangeable. - What is the frequency range advantage of 1/4" microphones?
Standard 1/2" microphones typically provide accurate response up to 20 kHz. With a 1/4" microphone and the Nor1205 preamplifier, the usable frequency range extends to 40 kHz or beyond, depending on the microphone model. This is essential for ultrasonic measurements, aeroacoustic research, and applications where high-frequency content must be accurately captured.
Application Guide
The Nor1205 1/4" 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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