Barrie By-law 2006-140, s. 6(1) — Noise By-law

if the computational circuit is of the sampling (digital) type, sampling shall take place at least twice per second;

• (m) the computation circuit shall operate over the usable dynamic range of the instrument with a linearity of ±1 dB for any sound with a ratio of peak pressure to root mean square pressure up to 3 (crest factor up to 3);
• (n) an operator-activated switch shall be provided to inhibit integration or, if the instrument has an internal elapsed time clock, to inhibit both integration and accumulation of time;
• (o) the combination of windscreen, microphone, A-weighting network, amplifier and computation circuit shall have a usable dynamic range extending at least from 50 dBA to 90 dBA and the manufacturer shall specify the usable dynamic range;
• (p) the instrument may be provided with more than one sensitivity setting and the manufacturer shall specify the minimum and maximum input sound level for each sensitivity setting;
• (q) if the maximum sound level specified for any sensitivity setting is less than 100 dBA, the system shall include a means of indicating to the operator that the maximum input sound level for that sensitivity setting has been exceeded and such indication shall be maintained until cancelled by the operator;
• (r) the display shall indicate either,
• (i) an output proportional to the integrated mean square A-weighted pressure, or
• (ii) the integrated mean square A-weighted pressure divided by the duration of the period of time for which the equivalent sound level is to be determined, or
• (iii) the equivalent sound level for the period of time for which the equivalent sound level is to be determined;
• (s) It shall be possible to read from the display or to calculate from the reading of the display, the equivalent sound level to a resolution of ±1 dB over the usable dynamic range of the instrument for integration times from 20 minutes to 60 minutes;
• (t) if the indication of the display is as described in subclause
• (ii) or
• (iii) of clause (r), the instrument shall include an elapsed-time clock;
• (u) the complete instrument shall follow the recommendations and meet the specifications of subclauses 7.4, 7.5, 7.6, 7.7, 7.8 and