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Nor1207 1/2″ ICP® microphone preamplifier
The Nor1207 is a low cost, general-purpose ICP®-preamplifier 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 preamplifiers only.
It is the first pattern evaluated ICP® preamplifier on the market, ensuring a high quality of the measurement in every environmental condition as specified 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.
Overview
The key components that determines the accuracy of a sound level meter is the measurement microphone and its associated preamplifier. The effectiveness of these components in converting the acoustic signal into an electrical analogue set the maximum accuracy that can be achieved by the ensuing signal processing. Norsonic have a carefully balanced range of measurement microphones to suite a range of applications that complement modern instrumentation yet maintain traditional values.
We offer a broad range of 1/2″ and 1/4″ microphone preamplifiers.
- Broad frequency response.
- Low noise.
- High input impedance.
- Low output impedance for driving long microphones cable without any loss in performance.
- High dynamic range.
Specifications
(Data given with 3mA supply current)
The preamplifier has to be supplied by a constant current in the range 3 – 20 mA.
The output voltage will be a fixed 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 and 6 dB for Nor1207
No signal DC out: 10 ± 2 volt
Output impedance: 35 ohm typical
Length incl. microphone Nor1228: 96 mm
Diameter: Nor1207/BNC: 14,5 mm
Nor1207: 16 mm
Weight incl. microphone Nor1228: 50 g
Power consumption: 30 mW (dependent on supplied current)
EMC classification: As for sound level meter Nor131
Temperature for specified operation: -10°C to +50°C
Temperature for storing: -30°C to +70°C
Humidity for storing and operation: 0 – 90% RH
Microphone heating: No extra heating available
Frequency response
Frequency response Nor1207
Self noise
Typical equivalent noise (level with a microphone with sensitivity 50mV/Pa and 18pF capacitance re. 20 µPa, e.g. Nor1228): 2 µV A-weighted (12 dB, Max 15 dB); 2,2 µV C-weighted (13 dB).
Max length of cable (100pF/m) with a microphone with sensitivity 50mV/Pa and 18pF capacitance (e.g. Nor1228):
Below 137 dB (re. 20 µPa): 30 m
Below 130 dB: 100 m
Below 120 dB (re. 20 µPa): 300 m
Connector type: Two versions available. Nor1207 with TNC connector and Nor1207/BNC with BNC jack.
ICP® is a registered trademark of PCB Piezotronics.
