ISS
8, SECTION 573-118-700TC
3.
19 Contact Timing Measurements (To
Zero
Test
Set)
Note:
Test
procedures
on this
page and the following page
apply only to 600 opm units
(Western Union
Plan
55
System)
using
one-cycle
cams.
EARLIEST START
TIMING CONTACTS
Zero
test
set
as
previously described.
(1) Requirement (front contact)
LATEST START
OF
CODE
READING
CONTACT
Connect neon
trace
to right side of
front
contact (normally open when unit
is
in
idle condition). With unit receiving continuous LETTERS code combinations,
observe
trace.
(a)
Latest
end minimum of 35 divisions
before
earliest
end of code reading contact
traces.
(b)
Earliest
start
minimum of
35
divisions
after
latest
start
of code reading contact
traces.
(c) Minimum
trace
length
200
divisions.
(d) Bounce should end within maximum 5 divisions of
earliest
start
and
latest
end of
any
trace.
Record
latest
start
and
earliest
end of
trace.
(2)
Requirement (applies only
if
complete
transfer
contact
is
used)
Connect neon
trace
to both sides
of
front contact.
Observe
trace.
Break
in
trace
at
two
places
to indicate
break
before
make
Min 10 divisions
(Test
continued on next
page.)
Page
99
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