© P R I N T E D IN * N
KENWOO
D
DISTORTION M E T E R
HM-250
INSTRUCTION MANUAL
K E N W O O D C O R P O R A T I O N
Page 1: ... PRINTED IN N KENWOOD DISTORTION METER HM 250 INSTRUCTION MANUAL K E N W O O D C O R P O R A T I O N ...
Page 2: ... E S 3 3 S P E C I F I C A T I O N S 4 4 P A N E L E X P L A N A T I O N 6 5 P R E C A U T I O N F O R U S E 8 6 O P E R A T I N G P R O C E D U R E 8 A p r o d u c t o f KENWOOD CORPORATION 1 7 5 2 chome Shibuya Shibuya ku Tokyo 1 50 Japan 2 ...
Page 3: ...ic w a v e reduction c i r c u i t to e l i m i n a t e c o m p l i cated a d j u s t m e n t s enabling easy to use a u t o m a t i c o p e r a t i o n T h e H M 2 5 0 can a l s o be used a s a 10Hz to 200kHz 100V f u l l scale h i g h l y s e n s i t i v e A C v o l t m e t e r a A u t o m a t i c t u n i n g o f f e r s easy o p e r a t i o n b H i g h s e n s i t i v i t y 0 1 f u l l scale d ...
Page 4: ...Higher h a r m o n i c s 6 0 k H z d i s t o r t i o n r a t e 30 B a s i c w a v e rejection r a t i o 80dB or more A C Voltage Measurement R a n g e of m e a s u r e m e n t 1 0 0 i V to 1 0 0 V F S in 1 3 steps Indication a c c u r a c y w i t h i n 3 of f u l l scale a t 1 k H z R e s i d u a l noise 5 or less of meter f u l l scale in 0 1 m V range w i t h closed input Frequency response 0 5d...
Page 5: ...0dB a t t e n u a t i o n 1 4 0 V r m s or less 2 0 0 V D C or less A C peak v a l u e D C 200V Environmental O p e r a t i n g t e m p e r a t u r e a n d h u m i d i t y 0 to 40 C 10 to 90 R H No dew c o n c e n t r a t i o n S t o r a g e t e m p e r a t u r e a n d h u m i d i t y 1 0 to 50 C 10 to 80 R H N o dew c o n c e n t r a t i o n Power Requirements V o l t a g e frequency 100 120 220 ...
Page 6: ...4 PANEL EXPLANATION 6 ...
Page 7: ... i n a l T h i s t e r m i n a l o u t p u t s basic w a v e in the D M mode Used together w i t h the Y O U T P U T t e r m i n a l f o r easy frequency a d j u s t m e n t by d i s p l a y i n g L i s s a j o u s w a v e f o r m s on an oscilloscope I G N D t e r m i n a l of t h i s meter Y O U T P U T t e r m i n a l T h i s t e r m i n a l o u t p u t s higher h a r m o n i c s in the D M mod...
Page 8: ... u e m a y be indicated or m o n i t o r w a v e f o r m m a y be influenced 6 OPERATING PROCEDURE P o w e r O N connect the a t t a c h e d power cable to the meter a n d a w a l l s o c k e t P r e s s the P O W E R s w i t c h a n d power is supplied to the meter P r i o r to a p p l y i n g input s i g n a l E x c e s s i v e input s i g n a l m a y d a m a g e t h i s meter Before a p p l y i...
Page 9: ...1 3 of the f u l l scale a n d the f u l l scale 1 How to read v o l t a g e T h r e e meter ranges a r e a v a i l a b l e f o r A C v o l t a g e m e a s u r e m e n t T h e r i g h t l a m p indicates a selected range T h e n u m b e r s above the pressed R A N G E s w i t c h in the r o w indicated by the l a m p s h o w the selected range In the e x a m p l e s h o w n in F i g 1 the 0 1V ran...
Page 10: ... I use care f o r e r r o r s due to load e f f e c t 6 M e a s u r e m e n t of Distortion R a t e 1 H o w to set c a l i b r a t i o n level F o r m e a s u r i n g d i s t o r t i o n r a t e input s i g n a l m u s t be c a l i b r a t e d to a c o n s t a n t level T h i s is called c a l i b r a t i o n o p e r a t i o n w h i c h is p e r f o r m e d a s f o l l o w s on t h i s meter using...
Page 11: ...m e n t to decrease the v a l u e indicated on the meter W h e n the v a l u e indicated on the meter lowers below 15 increase the meter range s e n s i t i v i t y to read i n d i c a t i o n T h e n u m b e r s in the lowest r o w w i t h l a m p O N indicate the range f o r d i s t o r t i o n r a t e m e a s u r e m e n t Frequency a d j u s t m e n t is f a c i l i t a t e d by con necting th...
Page 12: ...e If the frequency h a s been changed t u n i n g is required F o l l o w the i n s t r u c t i o n s below 1 P r e s s the C A L b u t t o n of the F U N C T I O N 2 A d j u s t the meter to its f u l l scale w i t h the A T T d B a n d S E N S I T I V I T Y 3 Set the meter range to 100 4 Press the D M b u t t o n o f the F U N C T I O N 5 Set the meter indication to a v a l u e below 15 w i t h ...
Page 13: ... t the s i g n a l level properly t h r o u g h c a l i b r a t i o n described in 6 2 1 to a v o i d s a t u r a t i o n of the internal c i r c u i t T h e s e l e c t i v i t y of the band pass f i l t e r Q is a p p r o x a p p r o x 5 Q center f r e q u e n c y b a n d w i d t h a t 3 d B point 6 4 Outputs D e t a i l s of the X and Y o u t p u t s of t h i s meter a r e a s f o l l o w s X o...
Page 14: ... e in the 100V range Note t h a t the Y o u t p u t s i g n a l s a c e r t a i n crossover d i s t o r t i o n Note If s i g n a l s are applied to the X or Y O U T P U T t e r m i n a l the meter is d a m a g e d Never a p p l y s i g n a l s to these t e r m i n a l s 14 ...
