Trigon Monolog Owner's Manual page 9

If the Status-LED (1) keeps flashing after the amplifier is powered up, the initial
impedance check has measured a load less than 2 Ohms at the output terminals
(speaker system and cable combined) – There may even be a short circuit!
Since any value below 2 Ohms is outside the design parameters, the unit's power
supply will not turn on.
Please turn off the
CAUTION! The impedance check is always performed when the unit is turned on.
This test takes only one second and cannot e performed during normal operation.
Should a short occur during operation it could cause the failure of output transistors.
Never change or work on any cables connected to the
amplifier is turned on!
If all measures within specs, the unit will power up within seconds and the Status-
LED (1) will be lit solid.
[ 2 ] VU METER
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The
level over a range from -40bB to +3dB. This LED VU Meter (2) inherently differs from
a mechanical device since it is mass less. Thus even very short peaks can be
displayed.
This feature allows to set the maximum acceptable level on he associated
preamplifier (if available). The maximum allowable level at the amplifiers input is
reached when the last LED is lit. Any further level increase will overdrive he amplifier
and potentially cause clipping of the output signal.
For the protection of your loudspeakers it is recommended not to exceed the
maximum safe output level, since especially tweeters are sensitive to high-order
distortion. The VU selector (9) toggles between display modes on the LED VU
Meter on the VU Mode Indicator (4). BAR Mode displays the current signal level as
bar-graph. Depressing the VU SWITCH (9) puts the LED VU Meter (2) in DOT
Mode. In this mode a single dot indicating signal peaks is added to the bar-graph.
The dot "lingers" somewhat longer at maximum excursion than the bar-graph,
facilitating the readout of peak levels. Depressing the VU selector (9) once more
turns the LED VU Meter off altogether.
[ 3 ] Mains Voltage Display
This gives a digital readout of the current AC mains voltage with a precision of
approx. 3%. Every second the mains voltage is measured 3 times. Subsequently the
displayed value may vary somewhat. The Mains Voltage Display (3) can be
disabled with the Display Switch (10).
[ 4 ] VU Mode Indicator
The BAR Mode displays the current signal level as bar-graph. Depressing the VU
selector (9) puts the LED VU-Meter in DOT Mode. In this combined mode a single
dot indicating signal peaks is added to the bar-graph. The dot "lingers" somewhat
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amplifier and verify all connections.
amplifier has an integrated VU-Meter which indicates the output
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cables when the