General Purpose Preamplifier
This is our general-purpose half-inch preamplifier suitable for most applications. It has a very low self-noise level and is fitted with an electrical heating system for use in conditions where condensation may cause a problem. Its high input impedance ensures a good low frequency response and the output stage is especially designed to drive long cables with full frequency range . The Nor-1201 has an integral LEMO style connector and there is a range of standard extension cables available including flat tape types to pass under doors etc. It has an M3 thread hole in the preamplifier body, allowing easy mounting of the preamplifier for various measurement applications.
Preamplifier Nor-1201 low frequency response for different microphone capacitances. Click on graph for an enlarged version.
Maximum upper frequency vs. cable length:
|
| Supply voltage 120V and assuming 50mV/Pa sensitivity |
|
| SPL |
10m |
20m |
50m |
100m |
| 150dB |
8kHz |
5kHz |
2kHz |
1kHz |
| 140dB |
35kHz |
20kHz |
12kHz |
5kHz |
| 130dB |
>100kHz |
70kHz |
40kHz |
15kHz |
| 120dB |
>100kHz |
>100kHz |
>100kHz |
60kHz |
| 110dB |
>100kHz |
>100kHz |
>100kHz |
>100kHz |
Maximum upper frequency as a function of cable length in metres for a supply voltage of 120V. THD<1%. Values apply to Nor-1201 only. Other preamplifers may give other results.
|
| Supply voltage28V and assuming 50mV/Pa sensitivity |
|
| SPL |
10m |
20m |
50m |
100m |
| 136dB |
15kHz |
8kHz |
5kHz |
2kHz |
| 130dB |
40kHz |
23kHz |
12kHz |
7kHz |
| 120dB |
>100kHz |
70kHz |
33kHz |
16kHz |
| 110dB |
>100kHz |
>100kHz |
>100kHz |
25kHz |
| 100dB |
>100kHz |
>100kHz |
>100kHz |
>100kHz |
Maximum upper frequency as a function of cable length in metres for a supply voltage of 28V. THD<1%. Values apply to Nor-1201 only. Other preamplifers may give other results
Specifications:
Frequency range: 1Hz to 1MHz ±0.5dB
Input impedance: 20 Gohms, 0.2pF
Output impedance: 55 ohms @ 1kHz, C S : 20pF
Noise, A-weighted, C S 20pF: <2.2µV
Noise linear, C S 20pF: <5.7µV
Gain, typical: -0.15dB
Temperature, operation: -40 to +60°C
Temperature, storage: -40 to +85°C
Humidity, operation and storage: 0 to 95% RH
Current consumption (120V or ±60V): 2.3 mA
Current consumption (28V or ±15V): 0.9 mA
Heater impedance: 225 ohms
Heater voltage: 0-15V
Dimensions: Length 127mm; diameter 12.7mm, weight 58g
CE classification, EMC: EN50081-1, EN50082-1
CE classification, safety: EN61010-1, 1993 portable equipment pollution category 2
Insert Voltage Preamplifier
This half-inch preamplifier is designed for calibration purposes using the insert voltage technique. The insert voltage technique is used for determine the open circuit voltage of a microphone cartridge. It is delivered with an integral LEMO style connector.
Specifications:
Frequency range: 2Hz to 200kHz ±0.2dB
Input impedance: 20 Gohms, 0.2pF
Output impedance: 55 ohms @ 1kHz, C S : 20pF
Noise, A-weighted, C S 20pF: <3µV
Noise linear, C S 20pF: <6µV
Gain, typical: -0.15dB
Temperature, operation: -40 to +60°C
Temperature, storage: -40 to +85°C
Humidity, operation and storage: 0 to 95% RH
Current consumption (120V or ±60V): 2.5 mA
Current consumption (28V or ±15V): 0.7 mA
Dimensions: Length 77.5mm; diameter 12.7mm, weight 33g
CE classification, EMC: EN50081-1, EN50082-1
CE classification, safety: EN61010-1, 1993 portable equipment pollution category 2
Nor-1204, ¼" General Purpose Preamplifier
For applications requiring quarter-inch microphones this preamplifier will optimise the measurement configuration. The outside diameter of the preamplifier matches that of the Nor-1244 and 1245 microphones in order that the assembly introduces the minimum disturbance to the field being investigated. Its electrical performance is closely equal to Nor-1201.
The body of the preamplifier is made of stainless steel and fitted with an integral 2-metre lightweight cable. This is terminated with a standard LEMO seven pin connector compatible with the standard range of Norsonic extension cables.
Specifications:
Frequency range: 2Hz to 200kHz ±0.2dB
Input impedance: 20 Gohms, 0.2pF
Output impedance: 55 ohms @ 1kHz, C S : 20pF
Noise, A-weighted, C S 20pF: <3µV
Noise linear, C S 20pF: <6µV
Gain, typical: -0.15dB
Temperature, operation: -40 to +60°C
Temperature, storage: -40 to +85°C
Humidity, operation and storage: 0 to 95% RH
Current consumption (120V or ±60V): 2.5 mA
Current consumption (28V or ±15V): 0.7 mA
Dimensions: Length 43mm; diameter 6.35 mm, weight 6g (not including the cable)
CE classification, EMC: EN50081-1, EN50082-1
CE classification, safety: EN61010-1, 1993 portable equipment pollution category 2
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