CLIO PRE01 Operating Manual

CLIO
ELECTRICAL & ACOUSTICAL TESTS
MICROPHONE
PREAMPLIFIER
PRE01
OPERATING MANUAL

PRODUCT DESCRIPTION

The microphone preamplifier PRE-01 has been designed to match Audiomatica's microphones MIC-
01 and MIC-02. It is particularly useful when the microphone has to be operated far from the
analyzer or when weighted measurements are needed. PRE-01 powers the microphone connected
to its input with an 8.2V phantom supply and adds a selectable weighting filter (A or B or C); also
available there is a 20 dB gain stage. The unit is operated with two standard 9V batteries or with an
external DC power supply.

TECHNICAL SPECIFICATIONS

FREQUENCY RESPONSE:
WEIGHTING FILTERS: A, B, C (IEC 651 - TYPE I)
PHANTOM POWER SUPPLY:
GAIN : 0 & 20dB (INTERNAL SETTINGS)
INPUT IMPEDANCE:
OUTPUT IMPEDANCE:
MAXIMUM OUTPUT VOLTAGE (@1kHz): 25 Vpp

USE OF THE PREAMPLIFIER

The MIC-01 or MIC-02 microphone cable has to be connected to the preamplifier input while the
preamplifier output has to be connected to the analyzer input. The unit is switched on with the
POWER switch, while the TEST push-button controls the state of the unit; when pressing it, if the
led light is on then the unit operates correctly, otherwise not: either the batteries are low or the
external power supply is not connected. The FILTER switch inserts the weigthing filter. To choose
the desired weighting filter type and to set the amplifier gain you have to modify the internal
settings as described later.
NOTE: if the 20 dB gain stage is inserted the overall sensitivity (microphone + pre) is 10
times higher. For example if your microphone has a sensitivity of 17.1 mV/Pa and you
preamplify it of 20 dB then you get a sensitivity of 171 mV/Pa.
÷
7Hz 110kHz (-3dB)
8.2V (5600 Ohm)
5600 Ohm
100 Ohm
INPUT OUTPUT
PRE-01 front panel.
THD (@1kHz):
INPUT NOISE (@20dB gain): 7uV LIN, 5.3uV A
DRIVE CAPABILITY:
BATTERIES DURATION:
SIZE:
WEIGHT:
PRE01
AUDIOMATICA
ON
OFF
FILTER TEST
0.01%
±
>24h (alkaline cells)
12.5x19x5cm
900g
ON
OFF
POWER
7mA