1/2" prepolarized condenser free-field microphone
50 mV/Pa, 15 – 146 dB | Model 377B02 Larson Davis

Model 377B02 is recommended for high accuracy applications
where high sensitivity is required for free-field
response type measurements
When a freely propagating sound wave encounters an object in its path, the wave will
either, be reflected, absorbed or transmitted depending on the material properties and
size of the object as well as the actual wavelength of the sound. In practice, the very
microphones used to quantify the sound field introduce disturbances to the field which
must be compensated for if an accurate measurement is desired. The impact seen, if
not corrected, is an increase of pressure in front of the diaphragm, which will lead to
an increase in output voltage. In order to compensate for this undesirable output, the
microphone is designed with correction factors to compensate for its own presence in
the sound field, at 0 degrees incidence
Model 377B02 is a prepolarized model that when combined with a preamplifier is
designed to operate on ICP® sensor power, or any 2-20 mA constant current supply.
This modern design is preferred for portable measurements or operation in high humidity
applications. Design advantages are coaxial cables usage and interchangeability
with other ICP® sensors (accelerometers, pressure sensors, strain gages, etc.) resulting
in set-up time savings and low channel cost.