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Teletype 28 - Page 96

Teletype 28
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SECTION
573-118-700TC
3.
16
Contact
Timing
Measurements
for
Auxiliary
Timing
Contacts
Note:
Test
procedures
on
this
page
apply
only
to 600 opm
units
(Bell
82Bl
System)
units
using
one-cycle
cams.
TRACE
OF
RIGHT SIDE
OF
REAR
CONTACT
EARLIEST
END OF CODE
READING CONTACT TRACES
TRACE
OF
BOTH SIDES
OF
FRONT CONTACT
~START-ZERO
MARK
TIMING CONTACTS
Zero
test
set
as
previously
described.
{1)
Requirement
{rear
contact)
Connect
neon
trace
to
right
side
of
rear
contact
(normally
open
when
unit
is
in
idle
condition).
With
unit
receiving
LETTERS
code
combinations,
observe
trace.
(a)
Earliest
start
minimum
of
35
divisions
after
start
zero
mark.
(b)
Latest
end
minimum
of
35
divisions
before
earliest
end
of
code
reading
contact
traces
recorded
when
zeroing
test
set.
(c)
Minimum
trace
length
225
divisions.
{d)
Bounce
should
end
within
maximum
5
divisions
of
start
and
end
of
any
trace.
(Test
continued
on
next
page.)
Page
96

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