L O A D T R A N S I E N T R E S P O N S E T I M - Agilent Technologies E3646A/47A User Manual

E364xa series. dual output dc power supplies
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Appendix Service Information
Constant Voltage (CV) Verifications
Load Transient Response Time
T h i s t e s t m e a s u r e s t h e t i m e f o r t h e o u t p u t v o l t a g e t o r e c o v e r t o w i t h i n 1 5 m V
o f n o m i n a l o u t p u t v o l t a g e f o l l o w i n g a l o a d c h a n g e f r o m f u l l l o a d t o h a l f l o a d ,
o r h a l f l o a d t o f u l l l o a d .
1 T u r n o f f t h e p o w e r s u p p l y a n d c o n n e c t t h e o u t p u t t o b e t e s t e d a s s h o w n i n
F i g u r e A - 1 w i t h a n o s c i l l o s c o p e . O p e r a t e t h e e l e c t r o n i c l o a d i n c o n s t a n t
c u r r e n t m o d e .
2 T u r n o n t h e p o w e r s u p p l y . S e l e c t t h e o u t p u t t o b e t e s t e d a n d t h e h i g h v o l t a g e
r a n g e ( 2 0 V / 1 . 5 A )
, e n a b l e t h e o u t p u t , a n d s e t t h e d i s p l a y t o t h e l i m i t m o d e .
W h e n t h e d i s p l a y i s i n t h e l i m i t m o d e , p r o g r a m t h e c u r r e n t t o t h e f u l l s c a l e
r a t e d v a l u e ( 1 . 5 A )
a n d t h e v o l t a g e t o t h e f u l l s c a l e r a t e d v a l u e ( 2 0 . 0 V )
3 S e t t h e e l e c t r o n i c l o a d t o t r a n s i e n t o p e r a t i o n m o d e b e t w e e n o n e h a l f o f t h e
o u t p u t ' s f u l l r a t e d v a l u e a n d t h e o u t p u t ' s f u l l r a t e d v a l u e a t a 1 k H z r a t e w i t h
5 0 % d u t y c y c l e .
4 S e t t h e o s c i l l o s c o p e f o r a c c o u p l i n g , i n t e r n a l s y n c , a n d l o c k o n e i t h e r t h e
p o s i t i v e o r n e g a t i v e l o a d t r a n s i e n t .
5 A d j u s t t h e o s c i l l o s c o p e t o d i s p l a y t r a n s i e n t s a s s h o w n i n F i g u r e A - 4 . N o t e t h a t
t h e p u l s e w i d t h ( t 2 - t 1 ) o f t h e t r a n s i e n t s a t 1 5 m V f r o m t h e b a s e l i n e i s n o m o r e
μ
t h a n 5 0
s e c f o r t h e o u t p u t .
6 R e p e a t s s t e p s ( 1 ) t h r o u g h ( 5 ) f o r t h e o t h e r o u t p u t .
Figure A-4 Transient Response Time
For E3646A model, and see
184
for other models
T a b l e A - 3
.

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E3648a/49a2110-10682110-10702110-04572110-0996

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