bittner XB400 - LED Indicators; Backside; Frontside; Level Control

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2 Technical Features

2.4 LED Indicators

2.4.1 Frontside

The ampliﬁers are equipped with 4 LEDs for each ampliﬁer channel:

LED Color Function

POWER green The ampliﬁer is powered up.

CLIP red The input is overloaded. The LED starts illuminating as soon as the signal is 0.5 dB

under full power.

SIGNAL green The signal reaches the output stage of the ampliﬁer.

PROTECT red This LED will light up as soon a protection circuit has been activated or if one of the

output relays has been activated. When the ampliﬁer is switched on, this LED will

light up for approximately 1.5 seconds.

The ampliﬁers of the XB and XV Series feature an Overheat LED on the front panel. If the ampliﬁer reaches

an operational temperature of 90

◦

Celsius the LED will light up.

The ampliﬁers of the XV DC and 4DXV Series are equipped with 2 additional LEDs on the front panel for the

supply voltages:

LED Color Function

AC POWER green Mains is present

DC POWER green Backup Power +24V is present

2.4.2 Backside

Ampliﬁers with an incorporated micro controller use an LED to indicate its operational status:

• slow blinking (about 1x/sec): All channels are OK

• fast blinking (about 3x/sec): Either the power supply failed or at least one of channels is in protect

Caution

After a power on of the ampliﬁer the LED is blinking fast (up to 3 sec.) until all internal supply

voltages have reached their correct levels.

Figure 2.3: Amp Status

2.5 Level Control

2.5.1 Analog Level Control

The ampliﬁers are equipped with two analog level control knobs, which are setting the level of the ampliﬁer.

The adjusting range is –90dB to 0dB. The 16 different settings of the switch are as follows:

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