Diode Measurements (Standard Method); Diode Measurements In Relative Reference Mode (Zero Set) - Philips pm2521 Operating Manual

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6.4.í.7. Diode measurements ( >l )
G E N E R A L
D i o d e s c a n b e m e a s u r e d i n t w o w a v s v i z . :
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D i o d e m e a s u r e m e n t s ( S t a n d a r d m e t h o d ) .
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D i o d 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 o 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 o f f e r s t h e p o s s i b i l i t y t o s e l e c t a p r e d e t e r m i n e d r e l a t i v e r e f e r e n c e z e r o l e v e l .
E a c h s u b s e q u e n t r e a d i n g w i l l i n d i c a t e t h e p o s i t i v e o r n e g a t i v e d e v i a t i o n f r o m t h e r e l a t i v e r e Í e r e n c e v a l u e .
E x a m p l e :
Measured diode value is e.g. 0.6200 V.
ln relative reference mode 0.6200 V will be displayed as 0.0000 V. The subsequent measured diode values are
e.g. O.6225 V and 0.6175 V. The values displayed will be respectively +0.0025 V and -0.0025 V. ln this way
it is possible to compare diode junctions.
D I O D E M E A S U R E M E N T S ( S T A N D A R D M E T H O D I
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S e l e c t f u n c t i o n d i o d 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 .
R e m a r k :
The diode function has only one range.
The value displayed is the voltage in forward or reverse direction acÍoss the diode in the 2 V range.
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C o n n e c t t h e d i o d e t o t h e 0 a n d V - S l - m A t e r m i n a l a c c o r d i n o t h e t a b l e b e l o w .
R e a d i n g
Forward Reverse
J I
G e
0 . 6 0 0 0 - 0 . 9 0 0 0 v
0.1000 0.3000 v
O L
O L
0
Hre
0
H(,_-_€
D I O D 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 I
- M e a s u r e t h e d i o d 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 andaZ 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
Íefative 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.
- 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 .