Nor1210A and Nor1210C0 pages

PD 1210 Ed.1 Rev.0 English 01.06

Product Data

Outdoor Microphone System
for permanent noise monitoring applications
Nor1210A and Nor1210C
The Outdoor Microphone System
Type Nor1210A (vertical incidence)
and Nor1210C (horisontal incidence)
are for outdoor use whenever troublefree acoustic measurements and, in
particular, community and traffic
noise monitoring are required. It complies with IEC 60651 Type 1, IRC
61672-1 Class1 and ANSI S1.4 1983
Type 1 requirements and can be used
with any suitable electronic sound or
vibration measurement system. It is
PTB approved as part of an IEC 60651
Type 1 system.
A 1⁄2-inch precision condenser
microphone and thick-lm preampli
er ensure maximum stability and performance. Both microphone and casing are made of stainless steel. Precise
in-situ calibration checks at 1000 Hz
are enabled any time via a built-in
electrostatic actuator and test oscillator. The Nor1210 is fitted with antibird spikes, a windscreen, and a rain
cap which is an integral part of its
acoustic omnidirectional characteristics.
The rain cap, which contains
the electrostatic actuator, remains in
position while calibrating the microphone with a pistonphone.
The large dynamic range of the
microphone system is obtained via a
twin circuit board with a DC converter
for supplying 200 V for microphone
polarization as well as a 120 V supply
for the preamplier. The sensitivity of
the amplifier can be adjusted by 12 dB
and the gain changed by ± 20 dB (via
a pair of circuit-board jumpers) to give
optimum signal-to-noise ratio on long
cables. The gain is normally set to 0
dB when skipped from the factory.
An A-weighting filter for increased dynamic capability is included
in the Nor1210. A circuit-board
jumper is used to select either the Aweighting or linear frequency re(Continued on page 2)

PD 1210 Ed.1 Rev.0 English 01.06

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