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5 J
6.4.2.4. High frequency measurements with HF probe PM 9210 and accessory set PM 9212 (Fig. 28,page 150).
G E N E R A L
T h e H F p r o b e P M 9 2 1 0 i s s u i t a b l e f o r m e a s u r i n g H F v o l t a g e s f r o m 1 5 0 m V t o | 5 V i n a Í r e q u e n c y r a n g e f r o m
1 0 0 k H z t o 1 G H z .
F o r H F v o l t a g e s f r o m 1 5 V t o 2 0 0 V a c a p a c i t i v e a t t e n u a t o r w i t h a n a d j u s t a b l e t r a n s f e r r a t i o o f 1 0 0 : 1 w h i c h
i s i n c l u d e d i n t h e a c c e s s o r v s e t P M 9 2 1 2 .
H I G H F R E O U E N C Y M E A S U R E M E N T S
- 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 .
- 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 21000 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 :
A v a i l a b l e r a n g e s a r e : 2 0 0 . 0 0 m V
2.0000 v
20.000 v
200.00 v
2000.0 v
Onf y ranges 200 mV, 2 V and 2O Y are being used. Overload is indicated with OL on the display
( D i s p l a y > 2 1 0 0 0 ) .
-
C o n n e c t t h e H F p r o b e P M 9 2 1 0 t o t h e P M 2 5 2 1 a s s h o w n i n Í i g u r e 2 8 , p a g e 1 5 0 .
R e m a r k :
To ensure reliable results when using probe PM 9210, special attention should be paid to the earthing when
measuring at high frequencies. The connection between the object to be measured and the probe should
therefore be as short as possible and the earthing of the probe should as far as possible be free from self-
inductance. The accuracy depends on the way in which the earthing is established. A suitable earthing point
will not always be available in the immediate vicinity of the point to be measured. lt is advisable, therefore,
to perform the measurements via the T-piece (PM 9212). For accurate measurements above approx. 100 MHz,
the use of the T-piece is imperative. To enable measurements in the non-linear range, a calibration chart is
s u p p l i e d w i t h t h e p r o b e .
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