This is an Octave Filter Set primarily intended for use with Precision Integrating Sound Level Meter Type 2230 or 2233 (not incl.). Used with either of the SLMs, it forms a compact and portable lightweight unit enabling in situ octave acoustic analysis. Semi-automatic recording of the analysis is possible using either Level Recorder Type 2306 or 2309 (not incl.). Manual stepping of the filter is indicated by a green LED.

The selectable centre frequency range is from 31.5 Hz to 16 kHz and a linear position gives a frequency band from 5 Hz to 75 kHz. The analysed signal may also be weighted by selecting 'A' or 'C' Frequency of the SLM.

Comes with Filter Set, Instruction Manual (with service instruction schematic) & Connector Kit