U.S. Department of Defense MIL-STD-810B — MIL-STD-810B Environmental Test Methods Standard (1967) — PDF Manual Download (EN)

Downloaded from https://www.everyspec.com MIL–STD-8 106 15 June 1967 W h e n t h e s e co n d i t i o n s m u s t b e c l o s e l y co n t r o ll e d , t h e fo ll o w i n g s h a ll b e m a i n t a i n e d : T e m p e r a t u r e 23 ° & 1.4 ° C ( 73 ° + 2.5 ° F ) R e l a t i v e hu m i d i t y 50 p e r c e n t * 5 p e r c e n t Atmospheric prea~”re 725 +50 mm . of m e r c u r y ( 28.5 ~~ ~ n f e r c u r y ) m e a s u r e m e n t s of t e s t co n d i t i o n s s h a ll b e 3.1.1 Measurements of test conditions. A ll 3.1.3 A ccur-acy of test apparatus.

T h e a c- c u r a c y of i n s t r u m e n t s a n d t e s t e q u i p m e n t m a d e w i t h i n s t r u m e n t s of t h e a cc u r a c y s p e c i - f i e d i n 3.1.3. u s e d t o co n t r o l o r m o n i t o r t h e t e s t p a r a - m e t e r s , w h e t h e r l oc a t e d a t a G o v e r n m e n t t e s t i n g l a b o r a t o r y o r a t t h e co n t r a c t o r s 3.1.2 i o k h - a n t e of test conditions. U n l e ss o t h e r w i s e s p e c i f i e d , t o l e r a n c e of t e s t co n d i - t i o n s s h a ll b e u fo ll o w s :

e v e r y 12 m o n t h s , p r e f e r a b l y o n c e e v e r y 6 p l a n t s h a ll b e v e r i f i e d p e r i o d i c a ll y ( a t l e a s t m o n t h s , un l e ss co n t r a c t o r p r oc e d u r e s p r e - p a r e d t o s a t i s f y t h e r e q u i r e m e n t s of M I L - C - 45662 fo r c a li b r a t i o n c y c l e of s p e c i f i c i n s t r u - ( a ) T o l e r a n c e s fo r u s e w i t h t e s t c h a m - b e r : m e n t s s p s c i f y o t h e r w i s e ) t o t h e s a t i s f a c t i o n of t h e p r oc u r i n g a c t i v i t y .

A ll i n s t r u m e n t s a n d t e s t e q u i p m e n t u s e d i n co n d u c t i n g t h e t e s t s s p e c i f i e d h e r e i n s h a ll : ( 1 ) A i r t e m p e r a t u r e a t t h e co n t r o l s e n s o r : 51.4 ° C ( 2.5 F ) . T e m p e r a t u r e g r a d i e n t a c r o ss t h e c r e ss - s e c t i o n a l a r e a occ u - ( a ) C o n fo r m t o l a b o r a t o r y s t a n d a r d s p i e d b y t h e t e s t i t e m s h a ll n o t w h o s e c a li b r a t i o n i s t r a c e a b l e t o t h e p r i m e s t a n d a r d s a t t h e U . S . e x c ee d 0.3 ° C ( 0.5 F ) p e r foo t i n a n y d i r e c t i o n . B u r e a u of S t a n d a r d s . ( 2 ) P r e ss u r e :

W h e n m e a s u r e d b y d e v i c e s s u c h a s m a n o m e t e r s , * 5 p e r c e n t o r * 1.5 mm . ( 0.059 ( b ) H a v e a n a cc u r a c y of a t l e a s t o n e - t h i r d t h e t o l e r a n m fo r t h e v a r i - a b l e t o b e m e a s u r e d . I n t h e e v e n t of co n f li c t b e t w ee n t h i s a cc u r a c y i n c h e s ) of m e r c u r y , w h i c h e v e r p r o v i d e s t h e g r e a t e s t a cc u r a c y . a n d a r e q u i r e m e n t fo r a cc u r a c y W h e n m e a s u r e d b y d e v i c e s s u c h a s i o n g a g e s , * 10 p e r c e n t t o i n a n y o n e of t h e t e s t m e t h o d s of t h i s s t a n d a r d , t h e :

a tt e r s h a ll 10 5 T o rr . g o v e r n . ( 3 ) R e l a t i v e hu m i d i t y a t t h e co n t r o l s e n s o r : = 5 p e r c e n t . (c) B e a pp r o p r i a t e fo r m e a s u r i n g t h e t e s t p a r a m e t e r s . ( b ) O t h e r t o l e r a n c e s : 3.1.4 Stabilization.. of test temperature. ( 1 ) V i b r a t i o n a m p li t u d e : Si nu s o i d a l , & 10 p e r c e n t . U n l e ss o t h e r w i s e s p e c i f i e d , t e m p e r a t u r e s t a - ( 2 ) V i b r a t i o n f r e q u e n c y :

& 2 p e r c e n t , b ili z a t i o n w ill h a v e b ee n a tt a i n e d w h e n t h e t e m p e r a t u r e of t h e p a r t of t h e t e s t i t e m con- o r a ]/ i C P S b e l o w 20 c p s . s i d e r e d t o h a v e t h e l o n g e s t t h e r m a l l a g d o e s n o t c h a n g e m o r e t h a n 2.0 ° C ( 3.6 ° F ) p e r ( 3 ) Acc e l e r a t i o n : t i 10 p e r c e n t . h o u r . 3