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• (1) Sound. An oscillation in pressure, particle displace- ment, particle velocity or other physical parameter, in a medium with internal forces that causes compression and rarefaction of that medium. The description of sound may include any characteristic of such sound, including duration, intensity and frequency. (m) Sound level. The weighted sound pressure level obtained by the use of a sound level meter and the A -frequency weighting network, as specified in American National Standards Institute specifications for sound level meters. (n) Sound level meter. An instrument which includes a microphone, amplifier, RMS detector, integrator or time averager, output meter and weighting networks used to measure sound pressure levels. Sec. 16.1-3. Administration and enforcement. The noise control program established by this chapter shall be enforced and administered by the police department with the assistance of other City departments as required. Sec. 16.1-4. Testing of metering devices. • In order to implement and enforce this chapter effectively, the chief of police shall, within a reasonable time after the effective date of the chapter, develop and promulgate standards and procedures for testing and validating sound level meters used in enforcement of this chapter. Sec. 16.1-5. Maximum nighttime sound levels in residential zones. (a) Nighttime. No person shall permit, operate or cause any source of sound 3n-sneh-e-manner-as to create a sound level in a residential zone or within any residential building during the hours between 10:00 P.M. and 6:00 A.M. in excess of 66 55 dBA when measured at or outside the property boundary. (b) Daytime. No person shall permit, operate or cause any source of sound to create a sound level in a residential zone or within any residential building during the hours between 6:00 A.M. and 10:00 P.M. in excess of 65 dBA when measured at or outside the property boundary. 0