Sennheiser AC 3 User manual

AC 3

Active Antenna Combiner

Bedienungsanleitung Instruction manual

Notice d’emploi

Manual de instrucciones

инструкция по эксплуатации

Istruzioni per l’uso

Manual de instruções

本使用说明书

AC 3_XXXXX__0109_Sp8.book Seite 1 Dienstag, 17. Februar 2009 1:59 13

Contents

Important safety instructions ........................................................ 2

The AC 3 active transmitter combiner ......................................... 4

Delivery includes ............................................................................... 4

Operating controls ............................................................................ 5

Block diagram .................................................................................... 6

Putting the AC 3 into operation .................................................... 7

Preparing the AC 3 for use ............................................................ 7

Using the AC 3 ................................................................................. 12

Cleaning the AC 3 ........................................................................... 13

If a problem occurs ... ..................................................................... 14

Accessories ...................................................................................... 15

Specifications .................................................................................. 16

Manufacturer Declarations ........................................................... 17

you

or c

oos

enn

ser!

We have designed this product to give you reliable operation

over many years. Over 60 years of accumulated expertise in the

design and manufacture of high-quality electro-acoustic equip-

ment have made Sennheiser a world-leading company in this

field.

Please take a few moments to read these instructions carefully,

as we want you to enjoy your new Sennheiser products quickly

and to the fullest

AC 3_XXXXX__0109_Sp8.book Seite 1 Dienstag, 17. Februar 2009 1:59 13

Important safety instructions

• Read this instruction manual.

• Keep this instruction manual. Always include this instruction

manual when passing the device on to third parties.

• Heed all warnings and follow all instructions in this instruc-

tion manual.

• Clean only with a slightly damp cloth.

• Refer all servicing to qualified service personnel.

Servicing is required if the device has been damaged in any

way, 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.

• WARNING: To reduce the risk of fire or electric shock, do not

use the device near water and do not expose it to rain or mois-

ture. Do not place objects filled with liquids, such as vases or

coffee cups, on the device.

• Only use the NT 3-1 table top power supply (see “Accesso-

ries” on page 15).

• Do not block any ventilation openings. Install the device in

accordance with the instructions given in this manual.

• Do not install the device near any heat sources.

• Only use attachments/accessories specified by Sennheiser.

Replacement parts

When replacement parts are required, be sure the service tech-

nician uses replacement parts specified by Sennheiser or those

having the same characteristics as the original part. Unauthor-

ized substitutions may result in fire, electric shock, or other

hazards.

Safety check

Upon completion of any service or repairs to this device, ask the

service technician to perform safety checks to determine that

the device is in a safe operating condition.

AC 3_XXXXX__0109_Sp8.book Seite 2 Dienstag, 17. Februar 2009 1:59 13

Important safety instructions

Intended use of the device

Intended use of the AC 3 includes:

• having read and understood this instruction manual espe-

cially the chapter “Important safety instructions” on page 2,

• using the device within the operating conditions and limita-

tions described in this instruction manual.

“Improper use” means using the AC 3 other than as described

in this instruction manual, or under operating conditions which

differ from those described herein.

AC 3_XXXXX__0109_Sp8.book Seite 3 Dienstag, 17. Februar 2009 1:59 13

The AC 3 active transmitter combiner

The AC 3 active transmitter

combiner

With the AC 3 4-to-1 active transmitter combiner, the signals of

up to four SR300IEMG3 type transmitters can be combined

onto a single antenna.

The integral active RF amplifiers ensure that the input signals

are combined onto the common antenna output with no distri-

bution attenuation.

The AC 3 incorporates DC distribution to enable simultaneous

powering of up to four transmitters via its BNC sockets. A single

NT 3-1 table top power supply (see “Accessories” on page 15)

is required to power the AC 3 and the connected transmitters.

Using the GA 3 rack adapter (see “Accessories” on page 15),

one AC 3 and one stationary SR 300 IEM G3 type transmitter

can be mounted into a 19” rack.

Alternatively, you can stack the AC 3. For stacking the AC 3,

mount the optional stacking elements (see “Accessories” on

page 15).

The AC 3 is suitable for the following areas of application:

• Multi-channel monitoring systems for stage use

• Multi-channel systems suitable for any application where

talk-back signals are to be transmitted (e.g. studio)

Delivery includes

1 AC 3 active transmitter combiner

1 set of device feet

4BNCcables

1 instruction manual

You additionally require the NT 3-1 table top power supply with

a suitable mains connector (see “Accessories” on page 15).

AC 3_XXXXX__0109_Sp8.book Seite 4 Dienstag, 17. Februar 2009 1:59 13

Operating controls

쐃STANDBY button

쐇Operation indicator

쐋4 status LEDs

– light up if the supply voltage for the transmitter is avail-

able at the BNC sockets RF IN 1 to RF IN 4

– go off if the BNC sockets RF IN 1 to RF IN 4 are short-

circuited or if transmitters are connected that are not of

the ew G3 series (e.g. transmitters of the ew G2 series)

쐏Cable grip for cable of table top power supply

쐄DC IN socket

for connection of NT 3-1 table top power supply

쐂4 BNC sockets RF IN 1 to RF IN 4

RF inputs for connection of the transmitters

Each of these RF inputs can power one transmitter.

쐆Air vents

쐊BNC socket RF OUT

for connecting the transmitting antenna

ANT

RF OUT

RF IN 1 RF IN 2 RF IN 3 RF IN 4

USE NT 3-1 ONLY

DC IN 13,8V/3,5A

12V/350mA

DC OUT

ANTENNA COMBINER AC 3

쐃쐇

쐂쐊쐆 쐏쐄

쐋

AC 3_XXXXX__0109_Sp8.book Seite 5 Dienstag, 17. Februar 2009 1:59 13

Block diagram

The below block diagram shows the connections for a 4-channel

system with a single antenna.

NT 3-1 ANT

AC 3

SR 300

RF Output

RF Inputs

SR 300

STANDBY

DC feed

AC 3_XXXXX__0109_Sp8.book Seite 6 Dienstag, 17. Februar 2009 1:59 13

Putting the AC 3 into operation

Preparing the AC 3 for use

Setting up the AC 3 on a flat surface

왘Place the AC 3 on a flat, horizontal surface.

Fastening the

stacking elements

To fasten the stacking elements 쐎:

왘Unscrew and remove the two recessed head screws (M4x8)

on each side of the AC 3.

왘Secure the stacking elements 쐎to the sides of the AC 3

using the previously removed recessed head screws (see

diagram).

The stacking elements (see “Accessories” on page 15)

are designed to help protect the operating elements

from damage or deformation, e.g. if the AC3 is

dropped.

왘Fasten the stacking elements even if you do not

want to stack your AC 3.

왘Do not fasten the stacking elements when mounting

the AC 3 into a 19” rack (see page 9).

쐎

AC 3_XXXXX__0109_Sp8.book Seite 7 Dienstag, 17. Februar 2009 1:59 13

Putting the AC 3 into operation

Stacking

several devices

You can stack several AC 3 and the connected transmitters on

top of each other.

왘Stack the devices so that the recesses of the stacking

elements completely engage with each other.

Fitting the

device feet

The device feet are fitted to the base of the AC 3 (see diagram).

왘Clean the base of the AC 3 where you want to fix the device

feet.

왘Fix the device feet to the base of the AC 3 by peeling off the

backing paper and fitting them as shown on the left.

왘Place the AC 3 on a flat, horizontal surface.

CAUTION! Danger of injury due to toppling stacks!

High stacks can easily topple over.

왘Place the stack on an absolutely flat surface.

왘Secure the stack against toppling over.

If you want to stack the AC 3, only fit the device feet to

the base of the lowermost device.

Do not fit the device feet when mounting the AC 3 into

a 19” rack.

Please note that the device feet can leave stains on deli-

cate surfaces!

AC 3_XXXXX__0109_Sp8.book Seite 8 Dienstag, 17. Februar 2009 1:59 13

Putting the AC 3 into operation

Mounting the AC 3 into a 19” rack

Rack mounting

one AC 3

왘Secure the rack mount “ears” 쐅(supplied with the optional

GA 3 rack adapter) to the AC 3 in the same way as described

for the stacking elements (see page 7).

왘Secure the blanking plate 쐈to one of the rack mount

“ears” 쐅using two recessed head screws (M 6x10)

(see diagram on page 10).

왘Insert the two blanking plugs 쐉into the holes of the

blanking plate (see diagram on page 10).

CAUTION! Risks when rack mounting the device!

When installing the device in a closed or multi-rack assembly,

please consider that, during operation, the ambient tempera-

ture, the mechanical loading and the electrical potentials will be

different from those of devices which are not mounted into a

rack.

왘The ambient temperature within the rack must not exceed

the temperature limit specified in the specifications.

왘Ensure sufficient ventilation; if necessary, provide additional

ventilation.

왘Make sure that the mechanical loading of the rack is even.

왘When connecting to the power supply, observe the informa-

tion indicated on the NT 3-1 table top power supply. Avoid

circuit overloading. If necessary, provide overcurrent protec-

tion.

왘When rack mounting, please note that intrinsically harmless

leakage currents of the individual power supplies may accu-

mulate, thereby exceeding the allowable limit value. As a

remedy, ground the rack via an additional ground connec-

tion.

AC 3_XXXXX__0109_Sp8.book Seite 9 Dienstag, 17. Februar 2009 1:59 13

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