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Teletype 28 - Page 94

Teletype 28
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SECTION
573-118-700TC
3.14
Contact
Timing
Measurements
for
Code
Reading
Contacts
Note:
Test
procedures
on
this
page
apply
to
600 opm
units
or
lower
only.
TRACE
OF SPACING
SIDE
OF
CONTACT
MAX
30
DIV
TRACE
OF
MARKING
SIDE
OF
CONTACT
CODE READING CONTACTS
BOUNCE
Zero
test
set
as
previously
instructed.
Connect
neon
trace
to
marking
side
of
a
code
reading
contact
(normally
open
when
unit
is
in
idle
condition). With unit"
receiving
continuous
LETTERS
code
combinations,
observe
trace.
Repeat
for
all
five
contacts.
(
1)
Requirement
(a)
Signal
length
for
each
contact
trace
and
combined
contact
traces
Min 450
divisions---Max
594
divisions
(b)
Bounce
should
end
within
maximum
of
20
divisions
of
earliest
start
and
latest
end
of
all
traces.
(2)
Requirement
(applies
to
transfer
contacts
only)
Connect
neon
trace
to
both
sides
of
contact.
With
unit
receiving
LETTERS
~ode
combinations,
observe
trace.
(a)
Break
in
trace
indicating
break
before
make
Min
3
divisions
(b)
Signal
length
of
spacing
side
of
contact
Min 100
divisions
(Test
continued
on
next
page.)
Page
94
"'~
4

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