Load Transient Response Time - Agilent Technologies E3633A Service Manual

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Chapter 3 Calibration Procedures
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 3 - 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 2 0 V / 1 0 A * o r 5 0 V / 4 A * * r a n g e , 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 r a t e d v a l u e ( 1 0 . 0 A ) * o r ( 4 . 0 A ) * * a n d t h e
v o l t a g e t o t h e f u l l r a t e d v a l u e ( 2 0 . 0 V ) * o r ( 5 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 3 - 3 . 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 .
Figure 3-3. Transient Response Time
*For Agilent E3633A Model
**For Agilent E3634A Model
3
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