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The Sound Pressure Level (SPL) Meter has all the features one
would expect from a professional instrument. There are three elements
in the SPL display. The small "SPL Window" in the lower
right of the display shows current SPL to 0.1 dB. The analog bar
display shows SPL in low (green), high (yellow), and very high
(red) at user defined levels. And the large digital display shows
SPL at a size that is easily seen from far away. Also shown is
the currently selected weighting/filtering and the selected broadband
detector.
(Meets ANSI S1.4-1983 Type II with standard Ivie mic; Type I with optional Ivie
mic (1134) and preamp (IE-2P).
Weighting/Filtering - It is customary for
the broadband detector of an instrument like the IE-33 to allow the application
of weighting filters such as Flat (no weighting), A or C. In addition to the
traditional weightings, the user can also choose to apply certain band pass filters
to the broad band detector. The IE-33 supports six octave band pass filters:
125Hz, 250Hz, 500Hz, 1 kHz, 2 kHz, and 4 kHz. Selection of the octave filters
is very useful in sound system dispersion (horn aiming) adjustments and for intelligibility
considerations in sound system coverage.
Detector Selection - The user can also select
from several different broad band detectors in the SPL Meter. Fast, Slow, Peak,
and Impulse are available. Meets requirements of ANSI @1.4-1971 Type S1A, S1C;
BS 4197-1967; DIN 45633 B1.1, B1.2 (Impulse); IEC 651-1979.
SPL Warning Levels - A number
of SPL monitoring applications require knowing when a certain level
is exceeded. The IE-33 SPL Monitor has provisions for two user adjustable
setpoints which can be used as warning levels. The user can set two
SPL points from a pop-up menu. When SPL exceeds the first point,
the vertical bars above that point to the left of the display, as
well as the disply itself, change to yellow. When the second point
is exceeded, the vertical bars above that point and the digital display
change to red, serving as a warning that the setpoint SPL’s
have been exceeded.
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