7
SAM-3B.V2-EX OPERATING INSTRUCTIONS
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Zum Einstellen der Verstärkung der Ein/Ausgangsverstärker durch die Rückwandbohrungen nur
Schlitzschraubendreher mit 2...2,5 mm Klingenbreite und mindestens 30 mm Klingenlänge bzw.
Kreuzschlitzschraubendreher Größe 0 verwenden! Rechtsdrehung der Spindeltrimmer vergrößert die
Verstärkung.
To adjust the gain of the input/output amplifiers through the rear panel holes, use only slotted
screwdrivers with a blade width of 2...2.5 mm and a blade length of at least 30 mm or Phillips
screwdriver size 0! Clockwise rotation of the spindle trimmers increases the amplification
The max. 16 input signals are connected to 1 or 2 37-pin -sub male connectors. Required mating
connector: 37-pin Sub- female connector strip female.
The max. 16 output signals are connected to 1 or 2 37-pin -sub male connectors. Required mating
connector: 37-pin Sub- female connector strip female.
The required Sub- connectors are optionally available in different versions.
6.4 WIDE-RANGE POWER SUPPLY :
Considerable effort has been put into the newly developed power supply in order to prevent even
the slightest interference from being fed into the audio mass. Mains frequency interference
components or their harmonics are typically below -140 dB! in the audio signal and are therefore
no longer perceptible. The SMPS-24T.V2 soft-start precision switching power supply produces
extremely stable and pure supply voltages. ue to the particularly gentle switch-on process, no
interference pulses occur in the mains during switch-on and switch-off. The modern switching
power supply technology ensures low current consumption from the mains and thus the power
consumption of a fully equipped SAM-3B.V2
EX is only typ. 13 W. This applies to all mains supply
voltages between 100...245 V with frequencies of 45...400 Hz. The unit can therefore be used on
all common power supply networks worldwide. This technology generates less heat in the unit. In
addition to the positive effects on the environment, this effort also benefits the service life of the
unit.
A particularly extensive mains filter reliably eliminates interference that could otherwise enter the
SAM-3B.V2
EX via the mains supply.
The power supply unit generates 2 balanced stabilised supply voltages of +/- 20.0 V for feeding
the balancing amplifier modules. 2 LE s on the front panel serve to monitor these voltages. To
avoid damage to the amplifiers and loudspeakers in case of overload or short-circuit of a supply
voltage, the power supply unit has a monitoring of the symmetry of the output voltages. If a
defined limit value for the symmetry is exceeded even minimally, e.g. by overloading an output,
the second output automatically follows the overloaded one in the amount of the output voltage. In
the event of a short circuit at one output, both main voltages in the SMPS-24T.V2 are regulated
back and the amplifier stage involved is switched off. The symmetry monitoring of the two supply
voltages does not allow a greater difference than typically +/- 100 mV.
The noise on the power supply lines is below 10 µV rms at full load in the range of 20 Hz...22 kHz.!
ll stabilised supply voltages of the integrated power supply unit are short-circuit-proof due to
internal current limits and therefore do not require fuses. The unit works perfectly even with
strongly fluctuating or unclean mains voltages between 100...265 volts AC at frequencies of
45...400 Hz.
6.4.1 Overtemperature protection
When mounting the unit in a rack, make sure that there is sufficient ventilation, as the SAM-3B.V2
mainly cools via the surface of the housing. This applies especially to fully equipped units. The
power supply unit is temperature-monitored and switches off automatically if it heats up too much,
e.g. if the unit is installed very unfavourably in the rack. When the unit has reached a preset, safe
temperature again, the internal power supply unit restarts automatically. This process is signalled
by the two voltage monitoring LE s on the front.
