Maemo a kalafoang a bongaka a thathamisitsoe ka tlase. Kakaretso ea Machaba ea Maloetse (ICD) mangolo a thathamisitsoe ka lipatlisiso ho latela tekanyo e 'ngoe le e' ngoe.
Lisosa tsa ho hana ho ngolisoa, ho ngolisoa, le ho kenya chelete (ntle le tumello ea tumello ) ke histori e tiisitsoeng ea:
a. Audiometers, e lumellanang le litekanyetso tsa International Standards Organization (ISO 1964) kapa American National Standards Institute (ANSI 1996), e tla sebelisoa ho hlahloba litsebo tsa bohle ba etsang kopo.
b. Litlhaloso tsohle tsa lipatlisiso kapa li-readometric tse tlalehiloeng litlalehong tsa tlhahlobo ea bongaka kapa litlaleho tse ling tsa bongaka li tla tsejoa ka ho hlaka.
c. Maemo a utloahalang a utloahalang a utloahala (litsebe tse peli) ke:
(1) molumo o hloekileng maotong a 500, 1000 le 2000 ka motsotsoana oa li-decibel tse fetang 30 (dB) ka karolelano (tsebe ka 'ngoe), e se nang motho ka mong ho feta 35dB maemong ana.
(2) Palo ea molumo o hloekileng o se nang 45 dB ho 3000 motlakase ka motsotso e mong le e mong tsebe, le 55 dB ho 4000 motlakase ka motsotso e mong le e mong tsebe.
E fumanoe Lefapheng la Tšireletso (DOD) Directive 6130.3, Melao ea Boipheliso ea ho khethoa, ho ngolisoa, le ho kenya chelete, le taelo ea DOD 6130.4, maqiti le litlhoko tsa tsamaiso bakeng sa Melao ea Boipheliso ea ho khethoa, ho ngolisoa, kapa ho khaola makhotla a sesole .