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 increases 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.
Technical specification
(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:
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 registred trademark of PCB Piezotronics | No extra heating available
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