audioplan PowerPlant 1500 U Betriebsanleitung - Seite 6

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Ampère

to the cable marking, the mains plug must be plugged in „turned". This

is only possible for symmetric plugs like the German Schuko plug. For

other types the wires need to be exchanged internally. This should only

be made by a qualified and trained technician! See warning below!

A note on cable length

The standard length of 1.5 m represents the shortest recommended

length for the Ampère cables. Shorter runs are possible but tend to sound

"lighter" and more forward. The reason is that the filter effect of the cable

depends on the length. Longer cables are therefore not only uncritical,

they also have a greater filtering effect which is beneficial for the sound

as this filtering effect comes without disadvantages in terms of dynamics.

The lower midrange sounds somewhat fuller, the colours are more natu-

ral, the sound is more three-dimensional and relaxed. This is especially

true for the Ampère S when connected to digital equipment. The Ampère L

has roughly double the filtering effect of the Ampère S.

Measuring the ground potential of components

LIABILITY/SAFETY WARNING

Audioplan accepts no responsibility for damage to property or personal

injury resulting from attempting to make the measurement described

herein. These instructions are only for trained electricians who are fa-

miliar with the safety standards and laws of their country. Do not make

any changes to mains cables, sockets, devices or connectors if you do

not have electrical engineering training. Mains voltage is dangerous

and can kill you.

ATTENTION /SAFETY WARNING

For the measurement of earthed units the earth connection to the unit

must be disconnected or insulated, otherwise no measurement is pos-

sible. In our experience, scotch tape does not work as insulation, it

tears when plugged in and there is again an earth contact between the

unit and the mains socket. No valid measurement is possible in this

case, the measured voltage will be close to zero volts. The most suita-

ble approach is to use a measuring adapter consisting of a socket and

a mains plug, which do not have a continuous earth connection. Please

leave this work to qualified persons. Mains voltage is life-threatening,

an interrupted protective earth conductor cannot protect you in the event

of a device fault to touch potentially lethal mains voltage.

Measurement:

The correct mains phase – the contact that carries "live" to the unit – is very

important for the sound, because it determines the level of the compen-

sation currents on the signal lines caused by different "ground potential".

Ampère

Therefore the minimal ground potential depending on the plug posi-

tion in the wall-outlet (this is only possible with a Schuko-plug which

is symmetrical) of all units of a system should be measured with a

high-impedance voltmeter (at least 10 MOhm internal resistance). First

check the position of the hot wire in the wall socket with a phase tester

(i.e. a screwdriver with neon lamp). Mark the socket on the side where

the neon glow lamp is lit. Each unit must be connected individually to

this marked socket with a multimeter in the V AC or ~ position. When

doing this, all connecting cables to other devices must be disconnect-

ed. Switch on the unit and measure the AC potential between the ground

terminal or the enclosure or signal ground of the unit and the mains

earth contact of a wall socket. Now turn the mains plug in the wall

socket or use a test cable with inverted polarity and measure again. The

smaller measured AC voltage determines the correct "phase position".

Since the „hot" side of the wall socket is known, you can now mark the

mains plug of the unit accordingly.

Measurement setup for adjusting the compensation on the Power-

Plant 1500 U. The amplifier is connected to the PowerPlant (adapter

shown on PowerPlant 1500 U to break the ground-connection) and

switched on. Measurement instrument (set to volts AC) is connected

between a signal-ground-contact of the unit (here: red cable is connect-

ed to the black terminal of loudspeaker output) and mains earth (here:

black cable is connected to the earth terminal of the PowerStar).