Nor1207 and Nor1207/BNC

Product catalog summary

Product Overview: The Nor1207 and Nor1207/BNC are low-cost, general-purpose ICP® preamplifiers designed for 1/2” prepolarized condenser microphones. They are suitable for applications such as microphone arrays, automotive, and general-purpose use. These preamplifiers are notable for their high dynamic range and compliance with class 1 requirements of IEC-61672.

Technical Specifications:

Power Supply: Requires a constant current supply between 3 – 20 mA.
Output Voltage: Fixed DC of approximately 10 volts plus AC-coupled input voltage.
Dynamic Range: Greater than 120 dB.
Input Impedance: 20 Gohm, 2.5 pF for Nor1207/BNC; 20 Gohm, 18 pF for Nor1207.
Frequency Response: ± 0.1 dB from 10 Hz to 20 kHz.
Output Impedance: 35 ohms typical.
Dimensions: Length with microphone Nor1228 is 96 mm; Diameter is 14.5 mm for Nor1207/BNC and 16 mm for Nor1207.
Weight: 50 g including microphone Nor1228.
Power Consumption: 30 mW depending on supplied current.
Environmental Conditions: Operating temperature from -10°C to +50°C; Storage temperature from -30°C to +70°C; Humidity range from 0 – 90% RH.
Self Noise: Typical equivalent noise is 2 µV A-weighted (12 dB, Max 15 dB); 2.2 µV C-weighted (13 dB).
Cable Length: Maximum cable length varies with sound pressure level, up to 300 m for levels below 120 dB.
Connector Types: Nor1207 uses a TNC connector, while Nor1207/BNC uses a BNC jack.

Performance: The frequency response graph indicates stable performance across a wide range of frequencies, ensuring accurate sound measurement.

Catalog excerpts

Product Data Applications • Microphone arrays • Automotive • General purpose The Nor1207 is a low cost, general-purpose ICP®-preamplier for 1/2” working standard prepolarized condenser microphones, designed for the most demanding use. It features a new design technology that increase the dynamic range to a value normally featured by traditional powered preampliers only. It is the rst pattern evaluated ICP® preamplier on the market, ensuring a high quality of the measurement in every environmental condition as specied in the class 1 requirements given in IEC-61672. Nor1207 apply a male TNC-connector for connection to cable or instrument, while Nor1207/BNC comes with a BNC female connector.

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Technical specication (Data given with 3mA supply current) The preamplier has to be supplied by a constant current in the range 3 – 20 mA. The output voltage will be a xed DC (about 10 volt) plus the AC-coupled input voltage. Output AC-voltage swing is minimum +/-5 volt if not limited by the voltage for the current source. Dynamic range: > 120dB Input impedance: 20 Gohm, 2,5 pF (typical) for Nor1207/BNC 20 Gohm, 18 pF (typical) for Nor1207 Frequency response ± 0,1 dB: (10 Hz – 20 kHz) Typical attenuation with microphone Nor1228 (18pF) due to capacitive loading: 1 dB for Nor1207/BNC 6 dB for Nor1207...

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