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Filter Information
053-469 RevC
SoundPro models SE and DL Addendum
About this manual
The SoundPro manual addendum contains a vast amount of information of which only a small amount is
relevant to the specific way you have your SoundPro SE/DL configured and any accessories you may be
using.
This manual has been organized to make the information that pertains to your instrument easy to find by
using the table of contents as a quick look-up to match your meter, microphone, and appropriate
accessories. How is the manual organized? The first sections contain information that is relative to all
SoundPro SE/DL instruments. The following sections listed under Microphones each contain all the
specific information that pertains to that microphone and instrument configuration. Different configurations
include use of a remote microphone preamp or using the preamp mounted locally, use of a windscreen,
and/or random incidence corrector ring.
Introduction of Specifications
Filter Information
All filters of all nominal filter bandwidths implemented comply with all performance requirements of the
IEC 61260:2001 standard within the tolerances for the accuracy class 1.
An optimized Parks-McClellan analytical method was used to implement the filter design.
The sampling frequency for the system is 52734.375 Hz. Individual filter rates are determined by octave-
based decimation by 2.
The base-ten system was used to determine the octave frequency ratio.
The reference attenuation is 0 dB for all filter bands.
The level of the instrument’s self-generated noise determines the maximum level linearity error of the
displayed signal level below the linear operating range. Therefore the maximum level linearity error of the
displayed signal level below the linear operating range may be equal to the self-generated noise level when
no input signal is present.
The overload status indicator ‘OL’ will appear at the top center of the display when the top of the linear
operating range has been reached. This will occur before the displayed signal level linearity errors exceed
the class 1 tolerance for level linearity error.
For each nominal filter bandwidth the frequency range for real-time operation and real-time spectral
analyses of transient and time-varying signals is 12.5 Hz to 20 kHz, center frequencies.
Magnetic fields
There are no measurable effects of magnetic fields up to 80 Ampere turns per meter at 60 Hz. The meter is
most susceptible to magnetic fields when the field lines are perpendicular to the meter face. This sound
level meter conforms to the basic specification of the IEC standard 61672-1 for the required immunity to
AC power frequency fields.