Reverse Current Loading - Agilent Technologies E3633A Operating Manual

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Chapter 7 Tutorial
Connecting the Load

Reverse Current Loading

A n a c t i v e l o a d c o n n e c t e d t o t h e p o w e r s u p p l y m a y a c t u a l l y d e l i v e r a r e v e r s e
c u r r e n t t o t h e s u p p l y d u r i n g a p o r t i o n o f i t s o p e r a t i n g c y c l e . A n e x t e r n a l s o u r c e
c a n n o t b e a l l o w e d t o p u m p c u r r e n t i n t o t h e s u p p l y w i t h o u t r i s k i n g l o s s o f
r e g u l a t i o n a n d p o s s i b l e d a m a g e . T h e s e e f f e c t s c a n b e a v o i d e d b y p r e l o a d i n g
t h e o u t p u t w i t h a d u m m y l o a d r e s i s t o r . T h e d u m m y l o a d r e s i s t o r s h o u l d d r a w
a t l e a s t t h e s a m e a m o u n t o f c u r r e n t f r o m t h e s u p p l y a s t h e a c t i v e l o a d m a y
d e l i v e r t o t h e s u p p l y . T h e v a l u e o f t h e c u r r e n t f o r t h e d u m m y l o a d p l u s t h e
v a l u e o f t h e c u r r e n t t h e l o a d d r a w s f r o m t h e s u p p l y m u s t b e l e s s t h a n t h e
m a x i m u m c u r r e n t o f t h e s u p p l y .
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