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CLIO
ELECTRICAL & ACOUSTICAL TESTS
AUDIOMATICA
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USE OF AN EXTERNAL POWER SUPPLY
As it may be seen from the above figure the unit can be powered by an external DC power supply
in the range 12÷16V capable of delivering a minimum of 100 mA. The silk-screen also reports
connector wiring with the positive at the tip contact.
INTERNAL SETTINGS
To be able to modify the unit’s internal settings and to replace the batteries you have to open the
unit itself; to do this first turn power off and then carefully unscrew the four screws at the top of the
case. You will gain access to the preamplifier PCB where the dip switches 1-4 and the batteries are
located. Please have Fig.1 as your reference.
TO REPLACE BATTERIES
Substitute the two 9V cells (BAT1 and BAT2) with two equivalent among the many available in the
market (PP3, 6AM6, 6LR6, MN1604 etc.). You may also use rechargeable ones. Take great care to
the polarity when inserting them into the sockets.
TO SELECT A WEIGTHING FILTER
Use dip switches 1-3, selecting one at a time, as follow:
- ‘A weighting’ filter
!
dip switch 1 ON (2&3 OFF)
- ‘B weighting’ filter
!
dip switch 2 ON (1&3 OFF)
- ‘C weighting’ filter
!
dip switch 3 ON (1&2 OFF)
Factory setting: ‘A weighting’ filter.
TO CHANGE AMPLIFIER GAIN
Use dip switch 4 as follow:
- +20 dB gain
!
dip switch 4 ON
- 0 dB gain
!
dip switch 4 OFF
Factory setting: +20 dB gain.
DIP SWITCHES 1-4
BATTERIES POLARITY
+
-
+
-
Fig.1 Internal settings.
PRE-01 rear panel.
BATTERY OPERATED MICROPHONE POWER
SUPPLY & PREAMPLIFIER
SERIAL No ____________
MADE IN ITALY
AUDIOMATICA SRL
DC IN (12
÷
16V)
+