High Current Measurements; Direct, Alternating High Current Measurements With Shunt Pm 9244 - Philips pm2521 Operating Manual

5 1
6.4.2.2. High current measurements (A-and
A -) with SHUNT PM 9244 or CURRENT TRANSFORMER
PM 9245 (Fig. 25 and 26, page 146,150).
G E N E R A L
W i t h t h e s h u n t P M 9 2 4 4 i t i s p o s s i b l e t o m e a s u r e d i r e c t a n d a l t e r n a t i n g c u r r e n t s ( m a x . 1 k H z ) u p t o 3 1 , 6 A .
A s o u t p u t v o l t a g e a s e l e c t i o n c a n b e m a d e b e t w e e n 3 1 . 6 m V o r 1 0 0 m V .
W i t h c u r r e n t t r a n s f o r m e r P M 9 2 4 5 i t i s p o s s i b l e t o m e a s u r e a l t e r n a t i n g c u r r e n t s o v e r 1 0 A u p t o 1 0 0 A .
T h e t r a n s f e r f a c t o r i s 1 0 0 0 ( 1 0 0 A = 1 0 0 m A ) .
A l l f a c i l i t i e s w h i c h a r e v a l i d i n t h e d i r e c t a n d a l t e r n a t i n g v o l t a g e a n d a l t e r n a t i n g c u r r e n t m e a s u r e m e n t s f u n c t i o n s
a r e a l s o v a l i d f o r t h e h i g h c u r r e n t m e a s u r e m e n t s .
D I R E C T , A L T E R N A T I N G H l c H C U R R E N T M E A S U R E M E N T S W I T H S H U N T P M 9 2 4 4 ( F i g . 2 5 . p a g e 1 4 6 ) .
-
S e l e c t f u n c t i o n V :
o r V - r m s w i t h t h e f u n c t i o n s e l e c t o r .
-
S e l e c t t h e m a n u a l o r a u t o m a t i c r a n g i n g m o d e w i t h p u s h b u t t o n A U T O / M A N *
R e m a r k :
Manual ranging is indicated with a * on the display.
In automatic ranging mode the UP level is 210000 and the DOWN level is 01800.
-
S e l e c t i n m a n u a l r a n g i n g m o d e t h e c o r r e c t r a n g e w i t h p u s h b u t t o n s U P o r D O W N .
R e m a r k :
Available ranges are: 200.00 mV
2.0000 v
20.000 v
200.00 v
2000.0 v
Only range 200 mV is being used. Overload is indicated with OL on the display.
- C o n n e c t t h e s h u n t P M 9 2 4 4 t o t h e P M 2 5 2 1 a s s h o w n i n f i g u r e 2 5 , p a g e i 4 6 .
R e m a r k :
There are two curÍent ranges available on the PM9244 viz.: 10 A and 31.6 A.
As output voltage a selection can be made between 31.6 mV or 100 mV.
1 0 [ + 1 0 0 m V 1 0 A + 3 1 . 6 m V
3 1 . 6 A - - + 1 0 0 m V
3 1 . 6 A +
3 1 . 6 V
Afternating currents may be measuÍed up to 1 kHz. As the high current measurements with the PM9244 are
made in the V-
and V- rms function of the PM 2521 ,they have the same facilities as direct and alternating
v o f t a g e m e a s u r e m e n t s . R e f e r t o C h a p t e r 6 . 7 . 1 . 1 . a n d C h a p t e r 6 . 7 . 1 . 2 .