Drawmer A2D2 DMS-3 Benutzerhandbuch - Seite 4

Blättern Sie online oder laden Sie pdf Benutzerhandbuch für Medienkonverter Drawmer A2D2 DMS-3 herunter. Drawmer A2D2 DMS-3 10 Seiten. Aes grade 1 dual output analogue to digital converter

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The DMS-3 is designed for standard 19" rack mounting occupying 1U of rack space. Avoid mounting the unit directly above power

supplies or amplifiers that radiate significant amounts of heat. If the unit is to be used in a mobile situation, it is strongly

recommended that the rear of the unit is supported in the carrying rack to avoid bending the front panel rack mounting 'ears'. Use

fibre or plastic washers to prevent the front panel becoming marked by the mounting bolts.

The A2D2 will be supplied with a power cable suitable for domestic power outlets in your country. For your own safety, it is

important that you use this cable to connect to the mains supply earth. The cable must not be tampered with or modified.

The power supply socket has an integral fuse drawer containing

the power fuse of the same value, to suit the mains voltage for

which the unit has been supplied. Removal of the drawer is only

possible with the power cord removed. The fuse should never

blow under normal operation. If the fuse is suspected of having

blown, then a fault will have occurred and this fault condition should

be inspected by a qualified service engineer. When replacing the

fuse, always comply with the Safety Instructions.

If the unit is to be used with a mains input operating voltage

different to that for which the unit is supplied, the following procedure must be carried

out by a technically competent person, (see following diagram)

1: Disconnect the unit from the mains.

2: Using a number 1 size pozidrive screwdriver, remove the nine self -tapping

screws that retain the top cover. Five screws are located on the top cover; and two

screws on either side. Slide off the cover.

3: Inside the unit slide the voltage change-over switch (VS1) until the correct (or

nearest) mains input voltage is visible on the switch actuator.

(see fig.4)

4: Replace the cover and the nine screws.

5: In the fuse draw change the fuse to suit the following values:

For 230 Volt operation alter the fuse to a similar type rated at T80mA.

For 115 Volt operation alter the fuse to a similar type rated at T160mA.

Analogue Inputs

The preffered inputs to the A2D2 are electronically balanced

and would normally be connected to your system via a

patchbay. Should unbalanced operation be required, simply

ground pin 3 on the XLR connectors.

If earth loop hum problems are encountered, do not disconnect

the mains earth but instead, try disconnecting one end of the

signal screen on the cables connecting the A2D2 to the

patchbay. If such measures are necessary, balanced operation

is recommended.

AES Input

Via an XLR connector designed to be used with standard

balanced microphone cable (20 metres maximum), wired pin

1 screen, pin 2 and 3 balanced data, and the XLR shell

connected to the chassis. Having many short cables joined

together is not advisable as each connector can cause

undesirable signal reflections.

The output socket fully conforms to the EMC standards; if the

unit is to be used where it may be exposed to high levels of

disturbance, such as found close to a TV or radio transmitter,

it is suggested that the screen of the data cable be connected

to the chassis connection on the XLR type connector rather

than to pin 1.

If ground loop problems are encountered, never disconnect

the mains ground, but instead, try disconnecting the signal

screen on one end of each cable connecting the outputs.

INSTALLATION

POWER CONNECTION

AUDIO CONNECTIONS

S/PDIF Input

Via a high quality RCA type phono jack where the data conforms

to the SonyJ PhillipsJ Digital InterFace format. Because

this connector only provides an unbalanced termination, the

recommended maximum length for this cable is 3 metres,

even with very high quality cable.

TOSLINK (or EIAJ)

The real benefit of TOSlink is that it is not susceptible to

electromagnetic noise, however, it is highly recommended

that a very good quality cable is used as the plastic conductors

used in cheap cables can damage data. Additionally

performance is compromised over long lengths of cable, as

the signal strength weakens due to impurities in the conductive

material, therefore lengths of no longer than five metres are

recommended unless using a signal booster..

Though the connectors are the same TOSLink and ADAT

Optical are not compatible with each other.

Word Clock

Use only good quality digital or video coax (not aerial

downlead) cable for the word-clock signals, terminated with

the correct type of 75Ω BNC connectors - inferior cables will

introduce jitter and will completely undermine the

performance benefits which might be achieved by using a

master clock in the first place!

FUSE

VS SWITCH