Neuberger RPM 370 Bedienungsanweisung Seite 23

B e i V o r r ö h r e n gen ügt u n te r U m stä n d en e in e in fa c h e s A b h ö r e n m it
d e m L a u t s p r e c h e r n ic h t; in d ie s e m F a lle w ir d an S telle d e s L a u t­
s p r e c h e r s e in d e r R ö h r e e n ts p r e c h e n d e r A u ß e n w id e rsta n d e in g e ­
s c h a lte t,, an w e lc h e n e in V e r s t ä r k e r a n g e k o p p e lt w e r d e n kann.
S e lb s tv e r s tä n d lic h
dung s m ö g lic h k e it e n , d ie h ie r n ic h t b e s o n d e r s b e s p r o c h e n w e r d e n .
III. D a te n b e stim m u n g u n b ek a n n ter R ö h r e n
A u f G ru n d d e r u n iv e r s e lle n U m s c h a ltm ö g li'c h k e ite n d e s M e ß g e r ä ts
is t au ch d ie D a te n b e s tim m u n g u n b ek a n n ter R ö h r e n le ic h t d u r c h ­
fü h r b a r .
N a ch F e s ts te llu n g d e r H e iz fa d e n a n s c h lü s s e m it t e ls O h m m e te r w ir d
a m b e s te n d u r c h e in e K a p a z itä ts m e s s u n g d e r K a to d e n a n sch lu ß e r ­
m it t e lt . (Z w is c h e n H e iz fa d e n und K a tod e b e s te h t im m e r d ie g r ö ß te
K a p a z itä t). D ie n o tw e n d ig e H eizsp a n n u n g w ir d d u r c h V e r s u c h e r m i t ­
te lt . (M it k le in e n H e iz Spannung s w e r te n b e g in n e n !)
D ie F e s ts te llu n g d e r ü b r ig e n E le k t r o d e n a n s c h lü s s e e r f o l g t d u r c h
A n le g e n e in e r k le in e n W e c h s e l Spannung und M e s s u n g d e s E le k t r o d e n -
s t r o m e s ü b e r das H a u p tin stru m e n t. (J e n ä h e r e in e E le k tr o d e d e r
K atod e li e g t , d e s t o g r ö ß e r is t ih r e S tr o m a u fn ä h m e . )
IV . L e istu n g sp rü fu n g
D ie L e is tu n g s p r ü fu n g s te llt nur e in e ü b e r s c h lä g ig e P rü fu n g d a r . Sie
is t m it d e m G e r ä t in fo lg e n d e r W e is e a u s fü h r b a r ;
1. D e r P r ü f a r t -S c h a lt e r w ir d in S tellu n g " L " g e s c h a lt e t .
F ü r d en P r ü fv o r g a n g steh en dann d r e i f e s t e W e c h se lsp a n n u n g e n z u r
V e r fü g u n g , d ie w a h lw e is e ü b e r S te c k e r v e r b in d u n g e n an d ie A node
d e r P r ü fr ö h r e g e le g t w e r d e n k ön n en .
B u c h s e " v "
B u c h s e " q "
B u ch se " r "
D ie ü b r ig e n E le k tr o d e n d e r R ö h r e , m it A u sn a h m e d e r H eizu n g und
d e r K a to d e , w e r d e n an A n od e g e s c h a lt e t . H ie r z u d ie n e n fo lg e n d e
B u c h s e n :
B u ch se " w "
B u ch se " x "
B u ch se llytl
B u ch se " z "
D ie S o c k e lu m sc h a ltu n g g e s c h ie h t w ie b e i d e r s ta t is c h e n R ö h r e n p r ü ­
fung ü b e r das S o c k e l s c h a lt - S t e c k e r fe ld .
D ie Spann u n gszufüh ru n g an d ie B u c h s e n r e ih e n "G 1 " b is ''G 4 " e r fo lg t
n ich t ü b e r d as B u c h s e n fe l d "U I " b is " U I V " .
In d e m Q u a d ra t v o n 4 x 4 B u c h s e n lin k s v o m S o c k e ls c h a lt fe ld d ü r fe n
b e i d e r L e is tu n g s p r ü fu n g k e in e S te c k e r g e s t e c k t w e r d e n . (D ie E le k ­
e r g e b e n s ic h n o c h e in e R e ih e w e i t e r e r A n w e n ­
Spannung = 1 0
Spannung = 1 5
Spannung = 20 V o lt
=
G itte r 1 an A n od e
=
G itte r 2 an A n o d e
=
G itte r 3 an A n od e
=
G itte r 4 an A n od e
V o lt
V o lt
21