For example: Agilent E4440A or Anritsu 68369
1558BP Octave Band Analyzer
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IET 1558BP Overview
Octave bands centered at ANS Preferred Frequencies (ANS Standard S1.6-1960) and conforms to standard specification for Octave, Half-Octave, and Third-Octave-Band Filter sets S.111-1966 for Type E, Class II octave band filters Includes an A-Weighted filter For direct use with piezoelectric microphones in the 44 to 150 dB range, to 24 dB with preamplifier Internal Calibration Circuit Portable, battery-operated