Norsonic nor1216, Инструкция по эксплуатации

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7 Norsonic Nor1216
Instruction Manual
Pin 3, allocated for polarization voltage, shall be
terminated to signal ground (pin 2) for the micro-
phone cartridge Nor1227. When the microphone unit
is equipped with the Nor1225 microphone cartridge
where polarization voltage is needed, 200 V must be
supplied to this terminal.
The supply voltage will affect the maximum sound pres-
sure that can be measured. For ±15 V or +30 V supply,
the maximum peak value exceeds 10 volt corresponding
to 140 dB peak sound pressure level for the Nor1227 /
Nor1225 microphone cartridge (50mV/Pa).
By the use of the “high level” option in Nor140, signals
with peak values up to 150 dB may be measured with
the microphone Nor1225.
1
2
3 4
5
7
6
Signal ground
Polarization voltage
Signal output
Not connected
Power
Power supply -
5
6
1
4
3
7
2
V+
NC
System check
Output
Heater
resistor
V
pol
V-
GND
NOTE: Nor140 with serial number below
1405079 must be upgraded in order
to deliver the required current for the
heater resistor which is used in Nor1216
to rise the temperature of the microphone and
preamplifier some degrees above the ambient
temperature.
NOTE: The high current consumption
due to the heater resistor requires that
the Nor140 is powered externally. Us-
ing the internal batteries may lead to
increased self noise.
The figure below shows a simplified electrical circuit
diagram of the complete outdoor microphone. The
microphone cartridge is connected to the preamp-
lifier input terminal. The figure below shows the output
connector seen from outside.