Sennheiser IAS MO 2000 SET Dimensions

Polar pattern Omni-directional
Sensitivity 15 mV/Pa
S/N related to 1 Pa sound pressure >50 dB(A)
Max. sound pressure level 134 dB
Amplification
Infinitely variable in the range
+/-15 dB, switchable in steps 0 dB,
+ 20 dB, + 40 dB
Optical fiber multimode 200/230 μm
Operating temperature range MO 2000 H: -10 °C to +70 °C
MO 2000 CU: 0 °C to +40 °C
Power supply
Plug-in power supply with country
adapters 100-240 V AC to
12 V DC, 5.4 W
Current consumption 120 mA
Output impedance Approx. 330 Ωasymmetrical /
660 Ωsymmetrical
AF output level 15 mV/Pa (potentiometer in mid
position, switch set to 0 dB)
Frequency response 20 Hz to 40 kHz (±6 dB)
Rugged design for use in areas of
aggressive substances (gases, salts, and
humidity) and radiation
Metal-free microphone components
prevents interference with other
equipment
High signal-to-noise ratio
Extensive frequency response
Reliable operation for acoustic measuring
and communication
KEY FEATURES TECHNICAL DATA
Optical Microphone Systems
MO 2000 Set and IAS MO 2000 Set
The Optical Microphone system, designed for special applications such as acoustic monitoring in industrial settings,
medical procedures, and technological measurement, is available in two variants:
MO 2000 Set – Includes the optical microphone with the MO 2000 H optical cable, the MO 2000 CU central unit,
power supply and carry case.
IAS MO 2000 Set – In addition to the above components, this system also includes the MZWW 2000 Set weather
protection accessory kit, making it ideal for use in potentially explosive atmospheres and outdoor applications.
The Sennheiser MO 2000 microphone head, which has an external diameter of 0.5 inches, is made of a plastic material
that is suitable for use in areas with aggressive substances (such as gases, salts, humidity) and radiation. All
components of the microphone head, including the optical waveguides, are free of metal; no electric current flows.
IAS MO 2000 Set
MO 2000 Set

Sennheiser Electronic Corporation
1 Enterprise Dr • Old Lyme, CT 06371
[phone]
APPLICATIONS:
Industrial applications - Possible applications for the optical microphone include the acoustic monitoring of power utility
plants (including hydroelectric, wind, and nuclear plants), as well as oil and natural gas production facilities. In this
example, the microphone would “hear” slow leaks, which, due to their small size, cause neither a pressure loss nor an
alarm message in other monitoring systems.
Medical applications - The microphone is ideal for use in magnetoencephalography (MEG) and magnetic resonance
imaging (MRI). For example, it maintains communication with the patient during MRI scans or achieves active noise
cancellation within the MRI machine. The optical microphone does not disturb the imaging process and is itself not
influenced by the strong fields inside MRI equipment.
Measuring applications - The microphone is ideal for use in EMI/EMC laboratories, as it does not influence the electric
field. In this case, for example, it functions like an ear on a cellular phone.
An optical principle is the only microphone principle in which the microphone head and electronics can be located far
away from each other. The optical microphone relies on light from an LED, which is directed onto a reflective diaphragm
via a fiber-optic cable (optical transmitter waveguide). The membrane then reflects part of the light into an optical
receiver waveguide. If the diaphragm is moved by sound signals, the reflected light beam is displaced, allowing more or
less light into the receiver waveguide. At the end of the receiver waveguide, a photodiode converts the light intensity
variations into electric signals.
HOW IT WORKS
Optical Microphone Systems
MO 2000 Set and IAS MO 2000 Set