Amplificazioni Lombardi LCOMP2 Podręcznik - Strona 9

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A M P L I F I C A Z I O N I

calibration

Input Circuit

R24

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).

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

R28

R128

R124

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