Microphones/Preamplifiers

Nor1205

¼″ insert voltage preamplifier

The Nor1205 ¼″ insert voltage microphone preamplifier is designed for precise calibration using the insert voltage technique and features a robust LEMO connector.

This method determines the open‑circuit voltage of a microphone cartridge with high accuracy, making the Nor1205 a reliable choice for laboratory microphone calibration systems.

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Specifications

Frequency range: 2Hz to 200 kHz ±0.2 dB
Input impedance: 20 Gohms, 0.2pF
Output impedance: 55 ohms @ 1kHz, CS: 20pF
Noise, A-weighted, CS 20pF: <3µV
Noise linear, CS 20pF: <6µV
Gain, typical: -0.15 dB
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: 77.5 mm
Diameter: 6,35 mm (front part) 12.7 mm (connector part)
Weight: 27 g

CE classification, EMC: EN 50081-1, EN 50082-1
CE classification, safety: EN 61010-1, 1993 portable equipment pollution category 2

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Nor1205

¼″ insert voltage preamplifier

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Applications

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