A M P L I F I C A Z I O N I
Monitoring the level of compression and limiting
CHANNEL A
- Switch the instrument on
“ liv. Uscita ”
(output level)
- Set the radio switch
“ Rapporto ”
on
8:1
-
Set the Threshold
“ Soglia “
to
0
-
Set the
“ Ingresso “
(input) level to the
maximum
value
-
The
“ Controllo in A “
switch(Control in A) has to be
disconnected
-
Verify that the mic/line button on the rear pannel, is positioned to
"linea"
(line)
- With a sine wave generator give a signal
(sine wawe, 2KHz freq ,
250mV intensivity)
into the input circuit of the channel
- Adjust the
"uscita"
level (output) on the yellow LED
(0dB)
- Using the
"soglia"
control (threshold) to bring the signal down to
-1dB
- Adjust the
"uscita"
control (output) and brindg the signal to
0 dB
- Increase the signal generator up to
2,5 V
(equal to +20dB)
- check that the LED meter light up to
+1,5 dB
- If necessary adjust the trimmer located inside into the main
boardsigned
R24 (channel A)
until the meter indicate
+1,5db
-
Then move the
"rapporto"
switch (ratio) on
12:1
and
20:1
and
verify that the signal value is displayed amounted to
+1 dB (with
12:1)
and
0 dB (with 20:1)
; work on the same trimmer to reach
this level
CHANNEL B
Same mode of channel A through the trimmer initialed
R 124
calibration
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.amplificazionilombardi.it
LCOMP2
page 9 of 13
Input Circuit
instrument calibration
The device has a level indicator LED meter.
In the rest position (no signal) with the switch set to "Liv. Compressione",
the Led bar is lit up at 0 db (yellow LED).
If this doesn't occur, it is possibile to calibrate the instrument using two
trimmers located inside the unit into the main board (
R28
for channel
A,
R128
for channel B).
Adjust the trimmer until you get
0db
(yellow led lit up).
R24
R124
R128
R28
