{"id":197453,"date":"2024-10-19T12:34:04","date_gmt":"2024-10-19T12:34:04","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/asa-s12-18-1994-r2019\/"},"modified":"2024-10-25T05:07:41","modified_gmt":"2024-10-25T05:07:41","slug":"asa-s12-18-1994-r2019","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/asa\/asa-s12-18-1994-r2019\/","title":{"rendered":"ASA S12.18 1994 R2019"},"content":{"rendered":"

None<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
9<\/td>\nO Introduction
4 Environmental requirements ………………………………… .
\n 4
4.2 <\/td>\n<\/tr>\n
10<\/td>\n1 Scope, purpose, and applications
2 References to other standards
4 <\/td>\n<\/tr>\n
11<\/td>\n3 Definitions <\/td>\n<\/tr>\n
12<\/td>\nGeneral ………………………………………………. .
\n Factors influencing sound pressure level measurements ………… .
\n Geometrical divergence …………………………………. .
\n 3
\n 3
\n 4
\n 4
\n 4.2.2 Atmospheric absorption
4.2.3 Effects of the environment
4.2.4 Miscellaneous attenuation <\/td>\n<\/tr>\n
13<\/td>\n4.3 Outdoor measurement of sound pressure level
4.3.1 Geometrical divergence
4.3.2 Atmospheric absorption <\/td>\n<\/tr>\n
14<\/td>\n4.3.3 Environmental measurements
4.4 METHOD #1 : General method for routine measurements
4.4.1 Effects of the environment
4.4.1.1 Wind, temperature and cloud cover <\/td>\n<\/tr>\n
15<\/td>\n4.4.1.2 Ground, precipitation and snow
4.4.2 Miscellaneous attenuation
4.5 METHOD #2: Precision method for accurate measurement
4.5.1 Effects of the environment
4.5.1.1 Requirements
4.5.1.2 Ground categorization
4.5.1.3 Ground classification <\/td>\n<\/tr>\n
16<\/td>\n4.5.1.4 Comparison of sound pressure levels
Page
\n 4.5.2 Miscellaneous attenuation
4.6 Terrain equivalence
4.7 Ground equivalence <\/td>\n<\/tr>\n
17<\/td>\n5 Acoustical environment
5.1 Types of measurements
5.1.1 Ambient sound measurements
5.1.2 Source measurements
5.2 Classification of the sound source
5.2.1 Temporal characteristics
5.2.2 Frequency characteristics <\/td>\n<\/tr>\n
19<\/td>\n6 Instruments for measuring sound pressure level outdoors . . . . . . . . . . . . . . 1 O
\n 6.1 Sound level meter\/analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 O
\n 6.2 Microphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 O
\n 6.3 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 O
\n 6.4 Tape recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 o
\n 6.5 Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 O
\n 6.6 Configuration of measuring system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 O
\n 6.7 Wind speed and direction . . . . . .. . . . . . .. .. . . . . . .. .. . . .. . . . . .. . .. .. . 1 O
\n 6.8 Temperature sensor
7 Measurement
7.1 Premeasurement planning
7.2 Sound descriptor
7 .3 Source configuration and operation
7 .3.1 Environmental conditions
7.3.2 Configuration and installation of a source at a sound measurement
\n site
7.3.2.1 Configuration and installation of the source
7.3.2.2 Configuration and installation of auxiliary equipment <\/td>\n<\/tr>\n
20<\/td>\n7.3.2.3 Physical environment in which the source is located
7.3.2.4 Specifying the installation of the microphones
ii
\n Page
\n 7 .4 Duration or sample size
7 .5 Data collection
7 .5.1 Preliminary verification
7 .5.2 Calibration <\/td>\n<\/tr>\n
21<\/td>\n7 .5.3 Meterological
7 .5.4 Background sound
7 .5.5 Sound pressure level at each microphone
7 .5.6 Repeat
7 .5. 7 Final calibration
8 Data reduction
8.1 Corrections
8.1.1 Calibration
8.1.2 Contamination by background sound <\/td>\n<\/tr>\n
22<\/td>\n8.1.3 Normalization to reference atmospheric or environmental
\n conditions
8.1.3.1 Temperature\/relative humidity
8.1.3.2 General meteorological conditions
8.1.3.3 Ground terrain
8.1.3.4 Miscellaneous effects
8.2 Experimental error <\/td>\n<\/tr>\n
23<\/td>\n9 Reporting
9.1 Introductory information
9.2 Site sketches
9.2.1 Plan view
9.2.2 Elevation view
9.3 Characterization of the source
9.4 Documentation of the instrumentation
9.5 Meteorological data
9.6 Acoustical data
9. 7 Other observations <\/td>\n<\/tr>\n
24<\/td>\niii
\n Page
\n Annex
\n A Propagation of sound outdoors
\n A.1 Geometrical divergence
A.2 Atmospheric absorption
A.3 Effects of the environment
A.3.1 Effect of a level reflecting ground <\/td>\n<\/tr>\n
25<\/td>\nA.3.2 Classification of ground surfaces
A.3.3 Refraction due to wind velocity and temperature gradients
A.3.4 Atmospheric turbulence <\/td>\n<\/tr>\n
26<\/td>\nA.4 Miscellaneous attenuation
A.4.1 Attenuation due to reflections
A.4.2 Attenuation due to foliage
A.4.3 Attenuation due to barriers
A.5 Discussion <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

ANSI\/ASA S12.18-1994 (R2019) American National Standard Procedures for Outdoor Measurement of Sound Pressure Level<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ASA<\/b><\/a><\/td>\n1994<\/td>\n30<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":197457,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2652],"product_tag":[],"class_list":{"0":"post-197453","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-asa","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/197453","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/197457"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=197453"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=197453"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=197453"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}