B&K 2250 Light Uživatelský manuál stáhnout pdf (Strana 315)

APPENDIX E

Glossary

303

Criterion Level 90 90 85 85 85, 90

PeaksOver Level

140 140 140 140 140

Exchange Rate for Lav 554N/AN/A

Weighting for Lav SSSN/AN/A

*. This is user-definable – the two other ‘PeaksOver Level’ parameters are preset to 137 and 135 dB resp.

Peak Maximum peak of the acceleration signal or voltage input with frequency

weighting Linear

Peak

Maximum peak of the acceleration value with frequency weighting W

or W

Reference Time: Reference Time is used for calculation of Sound Exposure Level L

ep,d,v

Time Weighed Average TWA

with a reference time other than 8 hours.

RC, RC Classification: The Room Criterion Mark II is primarily a diagnostic tool for HVAC noise in

spaces.

The RC curve is chosen as the value of the PSIL, rounded to the nearest

integer, in the range 25  RC  50.

The RC classification is the combination of the Sound Quality Descriptor and

the Probable Occupant Evaluation.

The sound quality descriptor can display the values (N) for neutral, where

no frequency range is dominant; (LF) for rumble, where the low-frequency

range (16 – 63 Hz) is dominant; (MF) for roar, where the mid-frequency range

(125 – 500 Hz) is dominant; and (HF) for hiss, where the high-frequency

range (1000 – 4000 Hz) is dominant. Furthermore, there are two variations

of (LF) if the spectrum in the low-frequency range is likely to introduce

vibrations: (LFVA), where there are clearly perceptible vibrations and (LFVB),

where there are moderately perceptible vibrations.

The probable occupant evaluation describes how an occupant responds to

a spectrum and can have the values Acceptable, Marginal or Objectionable.

Described in the ASHRAE Handbook – HVAC 2011 and ANSI 12.2–2008.

Room Criteria is for rating room noise

SIL, PSIL, SIL3: SIL (Speech Interference Level) is the arithmetic average of the 500 Hz,

1 kHz, 2 kHz and 4 kHz octave band levels.

PSIL (Preferred Speech Interference Level) is the arithmetic average of the

500 Hz, 1 kHz and 2 kHz octave band levels.

Used for evaluating the interference of noise upon speech communication.

SIL3 (Speech Interference Level based on highest 3 octaves) is the arithmetic

average of the 1 kHz, 2 kHz and 4 kHz octave band levels.

Note: Though SIL, PSIL and SIL3 are defined for octave band levels they

are also calculated for 1/3-octave band levels by summing the power values

in the three bands within each octave before doing the averaging.

Table E.1 Occupational Health Setup Parameters and Associated Standards

Setup Parameters OSHA MSHA DOD ACGIH ISO

1 2 ... 310 311 312 313 314 315 316 317 318 319 320 ... 331 332

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