ADJUSTMENT POINTS
Ÿ
Gain and modulometer adjustment
– Connect an AC voltmeter to the Left balanced line output.
Set channel 1 pan switch to L position, turn channel 1 fader fully clockwise, Master potentiometer in
0 dB position and switch LFA off. Connect an audio generator 1 kHz 0 dBm attenuator –80 dB to Mic 1
Input and adjust TRIM
AL
in the Left Limiter amplifier to obtain 0 dBu (+4 dBu on VU metered mixers) at
the Left balanced output. Then adjust TRIM
M1
in the Left Modulometer amplifier board to obtain 0 dB
on the Left meter. Cut off the input signal and switch on the Reference Generator . Adjust TRIM
RG
to
obtain 0 dB on the Left modulometer. Repeat for Right output and Right modulometer.
Ÿ
Limiter threshold adjustment
– Connect an AC voltmeter to the Left balanced line output. Apply a
1 kHz signal until the AC voltmeter reading is at the level desired with limiter switched off. Switch on
the limiter and adjust TRIM
LL1
in Left limiter amplifier until the level drops 0.5 dB. Repeat for Right
output and Right limiter trimpot.
