B&K 2250 Light Uživatelský manuál stáhnout pdf (Strana 314)

302

Hand-held Analyzer Types 2250 and 2270 – User Manual

NC, NC Decisive Band: Noise Criteria is used to rate steady-state continuous noise in a room from

all types of equipment, including fans, mixing boxes, diffusers, etc.

The rating is determined from 1/1-octave L

Zeq

spectra compared with NC

curves (based on equal loudness curves). The NC rating is the value of the

rating curve that falls entirely above the measured data. The Decisive Band

is the frequency band ‘touching’ the NC curve.

Defined in ANSI 12.2–2008

NCB, NCB Classification,

Rumble, Hiss, RV:

Balanced Noise Criteria is a refinement of NC.

The rating is determined by the SIL value and gets the Classification (R) for

Rumble, if the spectrum is rich in low frequency sound (16 Hz to 500 Hz),

the Classification (H) for Hiss, if the spectrum is rich in high frequency sound

(1 kHz to 8 kHz), or the Classification (RV) for Vibration and Rattle if the

spectrum at low frequencies (16 Hz to 63 Hz) is likely to produce audible

rattling in lightweight building elements.

The details of the NCB rating are defined in ANSI S12.2-1995

NR, NR Decisive Band: Noise Rating rates noise levels at public or private indoor areas.

The rating is determined from 1/1-octave L

Zeq

spectra compared with NR

curves (based on equal loudness curves). The NR rating is the value of the

highest NR curve ‘touched’ by the measured spectrum. The Decisive Band

is the frequency band ‘touching’ the NR curve.

Defined in ISO R1996(1971)

Occupational Health

Standards:

Typical Setup Parameter settings for Occupational Health measurements in

accordance with various standards:

• OSHA (Occupational Safety and Health Administration) – 29 CFR 1910.95

• MSHA (Mine Safety and Health Administration) – 30 CFR 62.0 UMHRPEL

• DOD (Department of Defence) – DoD Instruction 6055.12

• ACGIH (American Conference of Government Industrial Hygienists) –

DHHS Pub 98-126

• ISO – UK Noise at Work Regulations SI 1989/1790 amended by

SI 1992/2966 and SI 1996/341

See the table below, but please also check your local legislation.

Table E.1 Occupational Health Setup Parameters and Associated Standards

Setup Parameters OSHA MSHA DOD ACGIH ISO

Broadband (excl. Peak) AAA A A

Broadband Peak ZZZ Z C

Exposure Time N/A N/A N/A 8:00:00 8:00:00

Reference Time (Preset) 8:00:00 8:00:00 8:00:00 8:00:00 8:00:00

Reference Time (user-definable) 40:00:00 40:00:00 40:00:00 40:00:00 40:00:00

Threshold Level 80 80 80 80 70

1 2 ... 309 310 311 312 313 314 315 316 317 318 319 ... 331 332

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