Simpson 886-2, Operator'S Manual, Page: 20 / 24

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switch to 120, and depress “C” weighting button. Check peak reading on
meter dial. A reading of 125 dB approximates an impulse noise of 140 dB,
which is the upper limit established by the Walsh-Healy Act.
f. When not in use return the range switch to the OFF position and store the
Sound Level Meter in a safe place.
4.4 Use With Auxiliary Equipment
The 886-2 is equipped with three outputs intended to be used with auxiliary
equipment such as a chart recorder, oscilloscope or the Simpson 898 Octave
Band Filter. These jacks are designed to give the operator more detailed and
comprehensive sound analysis study. The larger of the three jacks is designed to
be used with the Simpson 898 Octave Band filter. The operator’s manual for the
Model 898 describes how to use the 886-2 with this filter.
Non-Linear Distortion: When using “A” weighting at frequencies from 30 Hz to 50
Hz, the AC output will have observable distortion with levels exceeding 0 dB on
any meter range. For “B” and “C” weighting, the AC output remains linear at
levels up to +10 dB on any meter range and at any specification frequency.