INSTRUCTION MANUAL 1670A MODEL INSTRUCTION MANUAL 1670A MODEL riple Output T Y DC POWER SUPPLTEST INSTRUMENT SAFETY ARNING W Normal use of test equipment exposes you to a certain amount of danger from electrical shock because testing must sometimes be performed where exposed high voltage is present. An electrical shock causing 10 milliamps of current to pass through the heart will stop most human heartbeats. oltage V as low as 35 volts dc or ac rms should be considered dangerous and hazardous since it can produce a lethal current under certain conditions. Higher voltages are even our more dangerous. Y normal work habits should include all accepted practices to prevent contact with exposed high voltage, and to steer current away from your heart in case of accidental contact with a high voltage. Observe the following safety precautions: 1. There is little danger of electrical shock from the dc output of this power . supply , However there are several other possible test conditions using this power supply that can create a high voltage shock hazard: a . I f t h e e q u i p m e n t u n d e r t e s t i s t h e h o t c h a s s i s t y p e , a s e r i o u s s h o c k h a z a r d e x i s t s u n l e s s t h e e q u i p m e n t i s u n p l u g g e d ( j u s t t u r n i n g o f f t h e e q u i p m e n t d o e s n o t r e m o v e t h e h a z a r d ) , o r a n i s o l a t i o n t r a n s f o r m e r i s u s e d . b . I f t h e e q u i p m e n t u n d e r t e s t i s p o w e r e d u p ( a n d t h a t e q u i p m e n t u s e s h i g h v o l t a g e i n a n y o f i t s c i r c u i t s ) , t h e p o w e r s u p p l y o u t p u t s m a y b e f l o a t e d t o t h e p o t e n t i a l a t t h e p o i n t o f c o n n e c t i o n . R e m e m b e r t h a t h i g h v o l t a g e m a y a p p e a r a t u n e x p e c t e d p o i n t s i n d e f e c t i v e e q u i p m e n t . D o n o t f l o a t t h e p o w e r s u p p l y o u t p u t t o m o r e t h a n 1 0 0 v o l t s p e a k w i t h r e s p e c t t o c h a s s i s o r e a r t h g r o u n d . c . I f t h e e q u i p m e n t u n d e r t e s t i s o f f ( a n d t h a t e q u i p m e n t u s e s h i g h v o l t a g e i n a n y o f i t s c i r c u i t s u n d e r n o r m a l o p e r a t i o n ) , d i s c h a r g e h i g h - v o l t a g e c a p a c i t o r s b e f o r e m a k i n g c o n n e c t i o n s o r t e s t s . S o m e c i r c u i t s r e t a i n h i g h v o l t a g e l o n g a f t e r t h e e q u i p m e n t i s t u r n e d o f f . 2 . U s e o n l y a p o l a r i z e d 3 - w i r e a c o u t l e t . T h i s a s s u r e s t h a t t h e p o w e r s u p p l y c h a s s i s , c a s e , a n d g r o u n d t e r m i n a l a r e c o n n e c t e d t o a g o o d e a r t h g r o u n d a n d r e d u c e s d a n g e r f r o m e l e c t r i c a l s h o c k . 3 . D o n t e x p o s e h i g h v o l t a g e n e e d l e s s l . y R e m o v e h o u s i n g s a n d c o v e r s o n l y w h e n n e c e s s a r . y T u r n o f f e q u i p m e n t w h i l e m a k i n g t e s t c o n n e c t i o n s i n h i g h - v o l t a g e c i r c u i t s . D i s c h a r g e h i g h - v o l t a g e c a p a c i t o r s a f t e r r e m o v i n g p o w e r. ( C o n t i n u e d o n i n s i d e b a c k c o v e r )