INPUT
OUTPUT
FILTER
TEST
POWER
PRE01
ON
OFF
AUDIOMATICA
ON
OFF
PRE-01 front panel.
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: 7Hz
÷
110kHz (-3dB)
WEIGHTING FILTERS: A, B, C (IEC 651 - TYPE I)
PHANTOM POWER SUPPLY: 8.2V (5600 Ohm)
GAIN : 0 & 20dB (INTERNAL SETTINGS)
INPUT IMPEDANCE: 5600 Ohm
OUTPUT IMPEDANCE: 100 Ohm
MAXIMUM OUTPUT VOLTAGE (@1kHz): 25 Vpp
THD (@1kHz): 0.01%
INPUT NOISE (@20dB gain): 7uV LIN, 5.3uV A
DRIVE CAPABILITY:
±
7mA
BATTERIES DURATION: >24h (alkaline cells)
SIZE: 12.5x19x5cm
WEIGHT: 900g
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 (micr 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.