Temperature Measurements In Relative Reference Mode (Zero Set); Frequency Measurements - Philips pm2521 Operating Manual

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T E M P E R A T U R E M E A S U R E M E N T S I N R E L A T I V E R E F E R E N C E M O D E ( Z E R O S E T )
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M e a s u r e t h e t e m o e r a t u r e a s d e s c r i b e d a b o v e .
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D e p r e s s p u s h b u t t o n Z E R O S E T .
R e m a r k :
The display will be held for one second and aZ will appear on the right hand side of the display,
The value which is on the display during this one second is the relative reference value.
After this one second the display jumps to zero and the indication ZS will appear on the display. The PM 2521
has now been switched to the relative reference mode (ZERO SET). In the relative reference mode the
PM2521 switches to manual ranging*. Each subsequent reading will indicate the positive or negative deviation
from the relative reference value.
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T o l e a v e t h e r e l a t i v e r e f e r e n c e m o d e d e p r e s s p u s h b u t t o n Z E R O s e t a g a i n .
6.4. 1.9. Frequency measurements (Hz)
G E N E R A L
T h e f r e q u e n c y m e a s u r e m e n t s i n t h e P M 2 5 2 1 a r e m a d e i n c o n j u n c t i o n w i t h t h e t r i g g e r l e v e l f u n c t i o n . E a c h
t i m e t h e i n p u t s i g n a l e x c e e d s t h e t r i g g e r l e v e l a c o u n t i s m a d e . A s t h e t r i g g e r c a n b e a d j u s t e d , i t i s i m p o r t a n ï
t o k n o w w h e r e t h e t r i g g e r l e v e l i s a n d i f t r i g g e r i n g t a k e s p l a c e b e Í o r e f r e q u e n c y m e a s u r e m e n t s a r e m a d e .
T h e o r d e r f o r m e a s u r i n g t h e f r e q u e n c y o f a s i g n a l i s a s f o l l o w s :
S e l e c t i o n o f t h e s e n s i t i v i t y r a n g e .
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S e l e c t i o n o f t h e t r i g g e r l e v e l
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M e a s u r e m e n t o f t h e f r e q u e n c y
F R E O U E N C Y M E A S U R E M E N T S
Selection of the sensitivity range
S e l e c t f u n c t i o n V :
w i t h t h e f u n c t i o n s e l e c t o r .
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S e l e c t t h e a u t o m a t i c r a n g i n g m o d e b y d e p r e s s i n g t h e A U T O / M A N * p u s h b u t t o n .
R e m a r k :
M a n u a l r a n g i n g i s i n d i c a t e d w i t h * o n t h e d i s p l a y .
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C o n n e c t t h e v o l t a g e s o u r c e t o t h e 0 a n d V t e r m i n a l a n d m e a s u r e t h e i n p u t s i g n a l .
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M a k e a n o t e o Í t h e s e l e c t e d r a n g e a n d p o l a r i t y . S l o w s i g n a l s m a y p a s s m o r e t h a n o n e r a n g e .
- S e l e c t f u n c t i o n t r i g g e r l e v e l w i t h t h e f u n c t i o n s e l e c t o r a n d s e l e c t o n e o f t h e n o t e d r a n g e s a n d p o l a r i t y .
R e m a r k :
R a n g e s
V - Trigger level
200 mV
2 V
2 V
2 0 v
200 v
2000 v
20v
200 v
2000 v
fnput signals that are lower than 7 ,5 % oÍ the end of range value of the trigger level range cannot be triggered
accurately.
I n t h e t r i g g e r l e v e l f u n c t i o n o n l y m a n u a l r a n g i n g i s p o s s i b l e w i t h t h e p u s h b u t t o n s U P o r D O W N .