Sennheiser MO 2000 Set User manual

MO 2000 Set
Instruction manual
LEVEL
OVERLOAD
00 40
20 +/- 15dB
dB
GAIN

1
Contents
Safety instructions..................................................................................................... 2
MO 2000 Set................................................................................................................ 4
Delivery includes .................................................................................................. 5
Product overview MO 2000 Set ............................................................................... 6
Putting the system into operation ......................................................................... 7
Fitting the device feet ........................................................................................ 7
Setting up the device .......................................................................................... 7
Rack mounting ..................................................................................................... 7
Connecting the mains unit ................................................................................ 8
Connecting the amplifier ................................................................................... 8
Connecting the optical microphone ................................................................ 9
Switching the central unit on/off .................................................................... 9
Adjusting the sensitivity ................................................................................... 9
Overload indication ............................................................................................. 9
Care and maintenance............................................................................................. 10
Accessories................................................................................................................. 10
Specifications ............................................................................................................ 11
Connector assignment ......................................................................................12
Frequency response curve ...............................................................................12
Manufacturer Declarations ..................................................................................... 13

2
Safety instructions
This instruction manual contains important safety information.
Read this instruction manual.
Keep this instruction manual in a safe place. Always include this instruction
manual when passing the system on to third parties.
Heed all warnings.
Follow all instructions.
WARNING: To reduce the risk of fire or electric shock, do not expose the device
and the mains unit to rain or moisture.
Disconnect the mains connector from the wall socket to completely discon-
nect the device from the mains during lightning storms or when unused for
long periods of time.
Use only the supplied mains unit.
Ensure that the mains unit is:
– always readily operable and easily accessible,
– properly plugged into the wall socket,
– only operated within the permissible temperature range (see “Specifi-
cations” on page 11)
– not covered or exposed to direct sunlight for longer periods of time in
order to prevent heat accumulation.
Use of the MO 2000 CU central unit
The MO 2000 CU central unit has been designed for use with the MO 2000 H
optical microphone.
Rack mounting
When installing the device in a closed or multi-rack assembly, please consider
that, during operation, the ambient temperature within the rack may signi-
ficantly rise above room temperature. However, the ambient temperature
within the rack must not exceed the temperature limit specified in the speci-
fications.
When installing the device in a rack, take good care not to affect the ventila-
tion required for safe operation or provide additional ventilation.
Make sure the mechanical loading of the rack is even to avoid a hazardous
condition such as a severely unbalanced rack.
When installing the device in a closed or multi-rack assembly, please note
that intrinsically harmless leakage currents of the individual devices may
accumulate, thereby exceeding the allowable limit value. As a remedy,
ground the rack via an additional ground connection.
TÜV 07 ATEX 553824
OPTICAL MIC CENTRE UNIT
II (2) G [Ex op is T6 Gb] IIC
II (2) D [Ex op is Db]

3
Operation
This device must be operated only from the type of power supply indicated
on the type plate. Observe correct polarity!
Never push objects of any kind through openings of this device as they may
touch dangerous voltage points or short-out parts that could result in fire or
electric shock.
Ensure sufficient ventilation. Do not block any ventilation openings. Install in
accordance with the manufacturer’s instructions.
Do not install near any heat sources such as central heating radiators, electric
heaters, stoves, or other devices that produce heat (e.g. amplifiers). Keep the
device away from direct sunlight and similar sources of heat.
Only use attachments/accessories specified by Sennheiser.
Use the device in dry rooms only. Do not expose the device to dripping or
splashing and ensure that no objects filled with liquids, such as vases or
coffee cups, are placed on the device. Do not use the device near water or
liquids.
Should a spillage occur, unplug the device and have it checked by a techni-
cian.
Service
No user serviceable parts inside! Do not attempt to service devices yourself as
opening or removing covers may expose dangerous voltage or other hazards.
If devices are opened by customers in breach of this instruction, the warranty
becomes null and void.
Refer all servicing to qualified service personnel. Servicing is required if a
device has been damaged in any way, such as mains cable or plug damage,
liquid has been spilled, objects have fallen inside, the device has been
exposed to rain or moisture, does not operate properly or has been dropped.
Intended use of the device
“Intended use” means that the device should be used within the operating
conditions and limitations described in this instruction manual. “Improper
use” means using the device other than as described in this instruction
manual, or under operating conditions which differ from those described
herein.

4
MO 2000 Set
The MO 2000 Set optical microphone system consists of the following main
components:
yMO 2000 H optical microphone
yMO 2000 CU central unit
The MO 2000 H optical microphone consists of an opto-acoustic microphone
head which is fitted with a fixed 3 m double fiber optic cable. The fiber optic
cable is connected to the MO 2000 CU central unit. Power is supplied via an
external wide voltage range power supply unit.
The MO 2000 H is an omni-directional microphone designed for picking up air-
borne sound. The components of the MO 2000 H microphone head (outside
dimensions: 1/2 inch) are made of plastic suitable for permanent stationary
use in areas where aggressive substances (gases, salts, moisture) or radia-
tion are present. All components of the MO 2000 H microphone head are
metal-free, including the fiber optic cable feed.
The main areas of application of the optical microphone are acoustic mea-
surement and communication tasks in industrial environments and EMC-sen-
sitive areas as well as medical magnetic resonance imaging and magneto-
encephalographic measurement (MEG). Other applications are to be found in
the field of non-detectable acoustic surveillance.

5
Delivery includes
y1 MO 2000 H optical microphone with 3 m fiber optic cable
y1 MO 2000 CU central unit
y1 mains unit with different country adapters
y1 carrying case
y1 instruction manual
LEVEL
OVERLOAD
00 40
20 +/- 15dB
dB
GAIN
Fiber optic
cable
Mains unit
MO 2000 CU
Optical microphone

6
Product overview MO 2000 Set
Gain switch (coarse adjustment)
Level control (fine adjustment), with 0 dB mark
OVERLOAD LED
ON/OFF button
Cable grip for power supply DC cable
DC socket for connection of power supply unit (DC IN)
Audio output (AF OUT BAL), XLR-3M, balanced
Audio output (AF OUT UNBAL), BNC socket, unbalanced
Type plate
SC duplex optical connection for microphone
Optical microphone
SC duplex connector
Mains unit
US adapter
UK adapter
EU adapter (preassembled)
LEVEL
OVERLOAD
00 40
20 +/- 15dB
dB
GAIN
OPTICAL MIC
INPUT
AF OUT
BAL/UNBAL
DC IN
12V/150mA LEV 6dBu MAX
쐋
     






7
Putting the system into operation
Fitting the device feet
You can set up the device on an even surface or mount it into a 19” rack.
Note:
Do not fit the rubber feet when rack mounting the device.
Setting up the device
To ensure that the device cannot slip on the surface on which it is placed, fix
the supplied four self-adhesive soft rubber feet to the base of the device.
왘Ensure that the base of the device is clean and free from grease before fit-
ting the rubber feet.
왘Fix the rubber feet to the base of the device by peeling off the backing
paper and fitting them as shown.
Rack mounting
For mounting two central units into a 19” rack, you require the GA 2 rack
adapter. The GA 2 rack adapter consists of:
y1 blanking plate 
y2 rack mount “ears” 
y1 jointing plate 
y2 blanking plugs  for closing off unused BNC holes
y12 recessed head screws M 3x6
y2 recessed head screws M 6x10
Risk of staining of furniture surfaces!
Some furniture surfaces have been treated with varnish, polish
or synthetics which might cause stains when they come into
contact with other synthetics. Despite a thorough testing of
the synthetics used by us, we cannot rule out the possibility of
staining.
왘Do not place the central unit on delicate furniture surfaces.
CAUTION!
Danger of heat damage!
When installing the device in a closed or multi-rack assembly,
please consider that, during operation, the temperature within
the rack may rise significantly.
왘Make sure not to affect the ventilation required for safe
operation or provide additional ventilation.
Danger of electric shock!
When installing the device in a closed or multi-rack assembly,
please note that intrinsically harmless leakage currents of the
individual devices may accumulate, thereby exceeding the
allowable limit value.
왘Ground the rack via an additional ground connection.
CAUTION!
CAUTION!



8
To mount two central units into a rack:
왘Place the two central units side by side upside-down onto a flat surface.
왘Align the jointing plate  over the holes in the bottom sides of the central
units.
왘Secure the jointing plate  to the central units using eight of the supplied
recessed head screws (M 3x6).
왘Hook the two rack mount “ears”  to the front panels of the central units.
왘Secure the rack mount “ears” to the central units using two of the sup-
plied recessed head screws (M 3x6) respectively.
왘Slide the central units into the 19” rack.
왘Secure the rack mount “ears” to the rack.
To mount only one central unit into a rack:
왘Hook the two rack mount “ears”  to the front panel of the central unit.
왘Secure the rack mount “ears” to the central unit using two of the supplied
recessed head screws (M 3x6) respectively.
왘Secure the blanking plate to one of the rack mount “ears” using two
of the supplied recessed head screws (M 6x10).
왘If you are not front mounting the BNC output connector, insert the two
blanking plugs into the holes of the blanking plate.
왘Slide the central unit into the 19” rack.
왘Secure the rack mount “ears” to the rack.
Connecting the mains unit
왘Connect the supplied mains unit to the socket  (DC IN). Use the cable
grip to secure the power supply DC cable.
왘Connect the suitable adapter to the mains unit .
왘Connect the mains unit to the mains.
The device switches on automatically.
Connecting the amplifier
The audio outputs are available as a balanced XLR-3M output  and an
unbalanced BNC output , allowing you to simultaneously connect two
devices (amplifier, etc.). Both outputs deliver the same output voltage, are
short-circuit proof and decoupled from each other.
왘Connect the amplifier/mixing console to the balanced XLR-3M output 
or the unbalanced BNC output .
For details on balanced or unbalanced connection, see “Connector assign-
ment” on page 12.






AF OUT
BAL/UNBAL
DC IN
12V/150mA LEV 6dBu MAX
 
AF OUT
BAL/UNBAL
DC IN
12V/150mA LEV 6dBu MAX
 