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
 

9
Connecting the optical microphone
왘Before connecting the optical microphone, remove the protections caps
from the microphone connections 1and 2of the central unit. Keep the
protection caps in a safe place for reuse during transport or storage. They
protect the microphone connections against dirt.
왘Connect the duplex connector of the optical microphone to the micro-
phone connections 1and 2of the central unit. Please observe the
correct insertion direction of the connector. The duplex connector is
connected the correct way round when the label on the connector is facing
downwards as shown.
Switching the central unit on/off
After connection to the mains, the device switches on automatically and the
ON button lights up.
왘Press the ON button to switch the MO 2000 CU central unit on or off.
Note:
If the power supply is interrupted for several seconds (e.g. due to a power
failure), the device switches on automatically even if it was switched off
before.
Adjusting the sensitivity
With the microphone connected and both the gain switch  and the level
control set to 0 dB, the specified sensitivity (mV/Pa) is obtained.
왘Use the gain switch to increase the output voltage level by 20 dB
(tenfold increase) or 40 dB (hundredfold increase).
왘Use the level control to steplessly adjust the output voltage level
between –15 dB and +15 dB.
Overload indication
The OVERLOAD LED indicates both positive and negative voltage peaks.
If the OVERLOAD LED lights up:
왘Use the gain control and/or the level control to reduce the output
voltage level so that the OVERLOAD LED no longer lights up.
Risk of damage to fiber optic cable!
Fiber optic cable must not be bent like conventional cable!
왘When installing fiber optic cable, make sure not to bend it
beyond a bend radius of 50 mm.
CAUTION!
OPTICAL MIC
INPUT

12
LEVEL
OVERLOAD
0 0 40
20 +/- 15dB
dB
GAIN
 
LEVEL
OVERLOAD
0 0 40
20 +/- 15dB
dB
GAIN
쐋

10
Care and maintenance
To clean the MO 2000 CU central unit:
왘Before cleaning, disconnect the device from the mains.
왘Use a soft, dry cloth to clean the device.
Accessories
Cat.-No. Accessory
009823 GA 2 rack adapter
525700 MO 2000 H optical microphone
525701 MO 2000 CU central unit
067510 Mains unit
502186 MZQ 2000 microphone clamp
511999 Carrying case
516503 Instruction manual
Liquids can damage the electronics of the MO 2000 CU central
unit!
Liquids entering the housing of the device can cause a short-
circuit and damage the electronics.
왘Keep all liquids far away from the device.
왘Before cleaning, disconnect all devices from the mains.
CAUTION!

11
Specifications
MO 2000 CU central unit
Housing 1/2 19” metal housing
Front panel connections and
controls ON/OFF button with operation indicator,
OVERLOAD LED,
gain control (coarse adjustment),
level control (fine adjustment), with
0 dB mark
Rear panel connections and
controls DC socket for connection of mains unit,
SC duplex input for microphone,
XLR socket, balanced
BNC socket
Power supply mains unit with country adapter
100-240 V AC to 12 V DC, 5.4 W
Power consumption of CU 1.5 W at 12 V DC
Current consumption 120 mA
Gain steplessly adjustable between +/–15 dB,
three settings: 0 dB, +20 dB, +40 dB
AF output level 15 mV/Pa (level control set to central
position, gain switch set to 0 dB)
Output impedance approx. 330 Ω unbalanced/660 Ω balanced
Max. output level 1.55 V
Operating temperature range 0 °C to +40 °C
Storage temperature range –20 °C to +70 °C
MO 2000 H optical microphone
Design MO 2000 H microphone head with
3 m fiber optic cable
Pick-up pattern omni-directional
Frequency response 20 Hz to 40 kHz (±6 dB)
Sensitivity 15 mV/Pa
S/N ratio at 1 Pa SPL > 50 dB(A)
Max. SPL 134 dB
Operating temperature range –10 °C to +70 °C
Storage temperature range –20 °C to +70 °C

12
Connection : fiber optic cable – extension (optional)
Interface SC
Design multimode 200/230 μm
Cable loss approx. 3–4 dB per 100 m
Optical transducer (optional)
Interface socket/socket
Design type SC
Coupling losses 5–6 dB per coupling pair
AF cable
Design balanced microphone cable with shielding
Connector assignment
Frequency response curve
21
3
+
DC connector for mains unit XLR-3F connector, balanced
20 50 100 200 500 1k 2k 5k 10k 20k 50k Hz
-30
-25
-20
-15
-10
-5
0
5
10
15
20
dB

13
Manufacturer Declarations
Warranty
Sennheiser GmbH & Co. KG gives a warranty of 24 months on this product.
For the current warranty conditions, please visit our web site at
www.sennheiser.com, or contact your Sennheiser partner.
CE Declaration of Conformity
This equipment is in compliance with the essential requirements and other
relevant provisions of Directives 2004/108/EC and 2006/95/EC.
Statements regarding FCC and industry Canada
This device complies with Part 15 of the FCC Rules and with RSS-210 of
Industry Canada. Operation is subject to the following two conditions: (1) this
device may not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause undesired
operation.
Changes or modifications made to this equipment not expressly approved by
Sennheiser electronic Corp. may void the FCC authorization to operate this
equipment.

14

Sennheiser electronic GmbH & Co. KG
Am Labor 1
30900 Wedemark, Germany
Phone [phone] Printed in Germany
Fax [phone] Publ. 08/08
www.sennheiser.com 524194/A01