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ACTION
TTS
26B
RESULT
Section 3
g.
T u r n the METER CIRCUIT switch to O/o
BREAK DIRECT.
h.
The FUNCTION, LINE (E) and DROP (M) k e y s
should be normal. u n l e s s r e q u i r e d f o r simultaneous
sending.
The DROP (M) key m a y be operated to
O F F HOOK to m a k e the t r u n k busy toward the
d r o p .
The E X T DIAL CIRCUIT switch i s not in
the m e a s u r i n g c i r c u i t .
The SPARK
SUP
turnbutton
i s not involved.
i.
It i s a s s u m e d that the trunk with E and M
-supervision has been turned down to t r a f f i c .
At
the m e a s u r i n g TTS 26B patch the
E
l e a d of the
trunk to the E
jack
( t i p ) , the t i p of the
LINE
jack,
o r the tip of the REC
E&M
jack, with a c o r d
having a 31 0- type plug on the end toward the s e t .
j. Request an off hook o r
a
s h o r t c i r c u i t on the
trunk a t the point w h e r e the s i g n a l s a r e to be
applied.
k.
T u r n the FUNCTION s w i t c h to CAL METER
1.
T u r n the FUNCTION s w i t c h to SEND ANDREC,
and r e q u e s t the distant end to send the s i g n a l to be
m e a s u r e d i n s t e a d of the off hook o r s h o r t c i r c u i t .
If the c i r c u i t h a s high inductance o r capacitance
which m a y d i s t o r t the pulse wave s h a p e the
METER CIRCUIT s w i t c h should be turned to
O/o BREAK 'fHRU RELAY instead o r e r r o n e o u s
r e a d i n g s m a y be obtained.
Adjust the M E T E R GAL c o n t r o l to obtain
0
on
the
%
BREAK s c a l e of the m e t e r .
Read the
Ojo
b r e a k on the
70
BREAK s c a l e of the
m e t e r of the s e t a t the m e a s u r i n g end.
3 . 2 1 MEASURING THE PULSE S P E E D O F A SIGNAL. The following p r o v i d e s the p r o c e d u r e f o r Mea-
----
s u r i n g the P u l s e Speed of a Signal:
ACTION
a.
With no power applied to the s e t , check the
position of the m e t e r pointer.
b.
After adjustment, back off the adjustment s c r e w
slightly to r e m o v e m e c h a n i c a l contact between the
adjustment s c r e w and the m e t e r m e c h a n i s m .
c .
FIRST i n s e r t the 310-type plug of the power
supply patch c o r d into the 4 8
VOLT
jack of the
s e t observing p r o p e r t i p and s l e e v e p o l a r i t y , and
then connect i t to the 48-volt dc supply.
RESULT
It should be on the 0 line of the P P S s c a l e
( m e t e r e l e c t r i c a l 0). If i t is off adjust the s c r e w
on the f r o n t of the m e t e r c a s e to b r i n g i t to
this line.
This c o m p l e t e s t h e m e c h a n i c a l adjustment of
the m e t e r e l e c t r i c a l
0.
If connection i s not m a d e i n this s e q u e n c e a
b a t t e r y supply fuse m a y
blow.
If the wrong 48-
volt jack
is
u s e d diode protection within the s e t
will p r o t e c t the s e t f r o m d a m a g e , but the s e t
will be inoperative i n succeeding s t e p s
.
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