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I
TROUBLE-ANALYSIS GUIDE
I
CIRCUIT
Oscillator
Detector
Batteries
Meter
Bridge
DETAILED SERVICE
INFORMATION
(Paragraph)
6.6.6.
6.4.5, 6.6.4 (DQ dial),
6.6.5 (CGRL dial), 6.6.8
tUNL I I O N SWI I LH S t I I I N t i
out (use external
signal source)
(external indicator may be
used)
I
out
in
in
DC EXTERNAL
out (use external
power supply)
out (use external
power supply)
out (use external
power supply)
in
Note that an equivalent, external circuit can be substituted for all of the major circuits, except the bridge circuit.
6.4 TROUBLE ANALYSIS.
switched out by means of t h e function switch a s de-
6.4.1
PRELIMINARY CHECKS.
t a i l e d in T a b l e -6-3.
If
s a t i s f a c t o r y measurements
a r e difficult or
impossible t o obtain, make t h e following e x t e r n a l
6.4-3 NO METER INDICATIONa
c h e c k s first:
1. I s t h e unknown component c o n n e c t e d correctly?
2. I s t h e unknown what i t is thought t o b e ?
Large inductors c a n look like c a p a c i t o r s a t 1 kHz.
3.
Are a l l t h e p a n e l s w i t c h e s s e t properly?
4.
Are t h e BIAS and E X T D Q jack s w i t c h e s
c l o s e d ?
Insert a plug and short t h e plug t o check.
5. I s t h e D s o high (Q s o low) that Orthonull
should b e u s e d ?
6.
I s OSC L E V E L control on?
7. I s D E T SENS control on?
8. Are t h e b a t t e r i e s correctly in p l a c e ?
No meter indication, or a low meter indication,
may b e due t o w e a k or dead b a t t e r i e s , lowoscillator
output, poor detector s e n s i t i v i t y , or a faulty meter.
If t h e trouble p e r s i s t s in the DC INTERNAL
6 V
posi-
tion of the function s w i t c h (where t h e oscillator and
detector a r e s w i t c h e d out), t h e fault is in either t h e
b a t t e r i e s or t h e meter circuit.
T h e b a t t e r i e s c a n b e c h e c k e d either by replace-
ment or by substitution of an e x t e r n a l d c power supply.
In t h e latter c a s e , s e t t h e bridge function switch t o
DC EXTERNAL. If t h e trouble p e r s i s t s , t h e meter is
6.4.2 TROUBLE-ANALYSIS GUIDE.
faulty.
T h e meter c a n b e c h e c k e d by connection of an
T h e T y p e 1650 Impedance Bridge incorporates
e x t e r n a l indicator (earphones, a c meter, o s c i l l o s c o p e ,
five major c i r c u i t s , one or more of which c a n b e
e t c ) t o t h e D E T jack.
SERVICE AND MAINTENANCE 6-4
l A B L t 8-4
MEASUREMENTS FOR CALIBRATION CHECK
FAULTY
COMPONENT
R5
R6
R7
R8
R 10
R11
R 13
(both C1 and R9)
R 9
RANGE
SETTING
100
I
0
1Ofi
I 0 0
0
1 k i 2
10 kR
100 k n
100 nF
1 PF
BRIDGE
CIRCUIT
R AC
R AC
R AC
R AC
R AC
R AC
R AC
CS
c s
MEASUREMENT
A
B
C
D
E
F
G
H
I
STANDARD
IQ
1
a
l o o n
l o o n
10 k f i
10 k n
1 M n
0.1 p F
0.1 p F
GENERAL
RADIO
CAT. NO.
14409601
1 440960 1
1 440962 1
1
440962 1
1 440964 1
14409641
1440-9661
1 409-9720
1409-9720
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