Labgruppen LAB 1000 Bedienungsanleitung PDF herunterladen (Seite 4)

Please refer to diagram on page 3

1. Speaker connector

This type of speaker connector may be

unfamiliar to some users. A full description is found

in the operation section. (See page 6).

2. Clip limiter switch.

Turns the clip limiter on and off.

3. Input jack

Alternative to using input XLR or for linking

inputs with other amplifiers. (See page 5).

4. Input signal XLR (See page 5).

5. Phase reverse switch for channel B

For reversing the input signal phase of channel

B to allow bridged operation. (See page 7).

6. Link switch

Allows a single input to drive both channels

simultaneously. (See page 7).

7. Gain select switch

Allows amplifier gain to be switched between

29dB and its normal gain at 0.775mV input

sensitivity. (See page 7).

8. AC line cord (See page 5).

Installation

1. Mounting

The amplifier is two rack units high (2U) and will

mount in a standard EIA 19 inch rack. Amplifiers

may be stacked directly on top of each other. There

is no need for spacing between units. If it is the

intention to fill a rack with amplifiers, we

recommend racking is started from the bottom of

the rack. It is also recommended that rear supports

are used for amplifiers mounted in the middle of the

rack, especially if used as part of a portable system.

2. Cooling

Your amplifier uses forced air cooling system to

maintain a low and even operating temperature. All

LAB.GRUPPEN amplifier, which are fan

ventilated, have front to rear cooling. There are

several reasons for this, one is that there's usually

cooler air outside the rack than inside and therefore

the amplifiers can run at higher continuos power

levels without thermal problems. Never try to

reverse the air flow, as the Intercooler® need a

pressure chamber between the fans and heat sink,

and this only works in one direction of the air flow

(see Design features on page 8).

Should a heat sink get too hot, its sensing circuit

will mute the hot channel.

Make sure that there is an adequate air supply in

front of the amplifier and that the rear of the

amplifier has sufficient space to allows the exhaust

to escape. If the amplifier is rack mounted, do not

use covers or doors on the front or rear of the rack.

For fixed installations with a central cooling

system, usually found in fixed installations with a

dedicated rack room, it may be necessary to

calculate the maximum heat emission. Refer to

Power consumption on page 5.

3. Operating voltage

A label just below the mains cable on the rear of

the amplifier indicates the AC mains voltage, for

which the amplifier is wired. Connect the power

cable only to the AC source referred to on the label.

The warranty will not cover damage caused by

connecting to the wrong type of AC mains.

For converting a 230 volt amplifier to 115 volt or

vice-versa, see Appendix A.

The amplifier is supplied with an approved European

AC line connector. If this connector is not

appropriate for your country, it can be cut off and

wired to a suitable connector in the following way :

BROWN LIVE

BLUE NEUTRAL

GREEN/YELLOW EARTH

Once the AC connector is connected to a suitable AC

supply, the amplifier can be started with the AC

actuator.

When you power up the amplifier, the fans then blow

at high speed before going onto "idle" and the 2

bottom green LED’s come on to show the output

circuits are receiving the correct rail voltage.

4. Grounding

There is no ground lift switch or terminal on this

amplifier. The signal ground is always floating via a

resistor to chassis and the grounding system is

automatic. If a potential above 0.6V presents itself

between signal ground and chassis ground, a short

circuit is introduced between the two, thereby

enabling electrical protection. If a unit in the system

is faulty, its mains fuse will blow, due to this

automatic ground system.

If however you wish to tie the signal ground to

chassis, connect the XLR-connector’s shell lug to

pin 1. In the interest of safety never disconnect the

earth pin on the AC cord.

For all units that are EMC approved (radio

interference), there is an AC mains filter. This filter

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