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MN 920 / MN 925

Product catalog summary

Overview: The MN 920 and MN 925 are 1-channel power supply units designed for measurement microphones. They include a precision measuring amplifier to adjust the dynamic range of the measuring signal for subsequent evaluation instruments. The MN 925 features an intelligent quick charge module for accumulators, utilizing the patented CCS-method.

Specifications:

Operation voltage for measuring preamplifier: 119 V ± 1V DC / 1.8 mA
Polarization voltage: 0 V / 200 V ± 0.1 V DC / 0.1 mA
Heater voltage: 0 V / 5.5 V DC / 30 mA
AC-output voltage: 2.6 V max. eff
Frequency range: 3 Hz to 1 MHz (± 0.1 dB)
Max. dynamic range: 138 dB
Gain switchable in 12 steps
Self-noise voltage: 25 µVeff to 330 nVeff depending on gain
External AC mains adaptor voltage: MN 920 (6-25 V DC / 400 mA), MN 925 (9-25 V DC / 600 mA)
Battery specifications: MN 920 uses AA batteries, MN 925 uses AA accumulators
Dimensions: 126 x 86 x 35 mm, Weight: 280 g

Features:

MN 925 includes a quick charge module for accumulators, not suitable for batteries.
Automatic switching to DC voltage from mains adaptor when connected.
Level indicator for visual control of output signal to prevent signal clipping.
High pass filter available to dampen infrasonic disturbances.
Device shuts down when total discharge level is reached, with a warning LED indicator.

Usage Recommendations:

MN 925 should be used with nickel metal hydride accumulators for optimal performance.
Ensure proper connection of AC mains adaptor to preserve battery charge for future use.
Monitor the level indicator to maintain output signal within the operating range.

Catalog excerpts

MICROTECH GEFELL microphones & acoustic systems - founded 1928 by Georg Neumann © 05/2010 Microtech Gefell GmbH 1-channel power supply unit MN 920, MN 925 Microtech Gefell GmbH · Georg-Neumann-Platz · 07926 Gefell · Germany Fon +49 (0)36649 882-0 · Fax +49 (0)36649 882-11 · www.microtechgefell.de · [email protected]

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1-channel power supply unit MN 920, MN 925 Technical specifications The MN 920/925 is a 1-channel power supply unit for measurement microphones. Between the input (MIC) and output (OUT) a precision measuring amplifier with varying amplification is connected. It adjusts the dynamic range of the measuring signal to the input dynamic of the following evaluation instrument. Additionally it is a driver for capacitive loading, e. g. long BNC-cables at signal outputs. Voltage for measuring microphone supply: Operation voltage for measuring preamplifier Polarization voltage Heater voltage The MN 925...

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MN 920 / MN 925

MN 920 / MN 925

Catalog excerpts

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