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

Appendix Service Information
Constant Current (CC) Verifications
6 A d j u s t t h e t r a n s f o r m e r t o 1 0 % a b o v e t h e n o m i n a l l i n e v o l t a g e ( 1 2 7 V a c f o r a
1 1 5 V a c n o m i n a l i n p u t , 1 1 0 V a c f o r a 1 0 0 V a c n o m i n a l i n p u t o r 2 5 3 V a c f o r a
2 3 0 V a c n o m i n a l i n p u t ) . R e c o r d t h e c u r r e n t r e a d i n g a g a i n i m m e d i a t e l y b y
d i v i d i n g t h e v o l t a g e r e a d i n g o n t h e d i g i t a l v o l t m e t e r b y t h e r e s i s t a n c e o f t h e
c u r r e n t m o n i t o r i n g r e s i s t o r . T h e d i f f e r e n c e b e t w e e n t h e c u r r e n t r e a d i n g s i n
s t e p ( 5 ) a n d ( 6 ) i s t h e l o a d r e g u l a t i o n c u r r e n t . T h e d i f f e r e n c e o f t h e r e a d i n g s
d u r i n g t h e i m m e d i a t e c h a n g e s h o u l d b e w i t h i n t h e l i m i t o f :
7 R e p e a t s t e p s ( 1 ) t h r o u g h ( 6 ) f o r t h e o t h e r o u t p u t .
CC PARD (Ripple and Noise)
P e r i o d i c a n d r a n d o m d e v i a t i o n s ( P A R D ) i n t h e o u t p u t ( r i p p l e a n d n o i s e )
c o m b i n e t o p r o d u c e a r e s i d u a l a c c u r r e n t , a s w e l l , a s a n a c v o l t a g e
s u p e r i m p o s e d o n t h e d c o u t p u t . C C P A R D i s s p e c i f i e d a s t h e r m s o u t p u t c u r r e n t
i n a f r e q u e n c y r a n g e 2 0 H z t o 2 0 M H z w i t h t h e p o w e r s u p p l y i n c o n s t a n t c u r r e n t
o p e r a t i o n .
N o t e :
For better measurement result, it is recommended to make the connection between
the BNC receptacle and the output terminals shorter as much as possible, and to use
the recommended split ferrites with the cable (BNC to BNC) as shown above.
Current
Monitoring
Resistor
BNC
Receptacle
188
E3646A E3647A
0.55 mA 0.33 mA
RMS voltmeter
Split
Input
Ferrites
BNC Cable
(Front Panel Connections)
E3648A E3649A
0.75 mA 0.39 mA
Current
Monitoring
Resistor
(Rear Panel Connections)
RMS voltmeter
Input