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CARD HANDLING
HINTS
Card Handling
The
following
applies to
punched
cards
in
the
keypunch
room,
regardless
of
the particular
type of
punch
or
verifier
being
used.
Data
processing cards
can be
affected
by
heat,
cold,
and (most
significantly)
by
humidity.
For example;
cards transferred
from
a cold
room
to a
warm room
will
collect
moisture. Variations
in
humidity
will alter
a card's
size
and
weight
by
changing
its
moisture content
and
may
cause
the card to
warp. This
is
a
frequent cause
of
card
feeding trouble
in
a data processing
installation.
Before
use,
cards
should
be
given
ample
time
to achieve
a
moisture balance with
the
machine
room
atmosphere.
Where
space permits,
facilities
can be
set
up
in
the
working
area
for a
five
to
ten days' supply
of
cards, in
which
time they can
become
acclimated.
It
is
advisable
that
care
be
exercised
in
regulating
thermostats
and
in
opening
or
closing
windows
in
working
areas.
In
winter,
a
favorable
relative
humidity
in
the
machine
room
is
more
easily
maintained
at
lower tempera-
tures.
Continuously high temperatures dry
the
air
and
may
cause a
drop
in
recommended
humidity
levels.
Hot,
humid
weather can be
offset
by
the use
of dehumidifiers
in
the
working
areas.
For
best
machine
performance,
cards
should be
perfectly
flat
for
machine
feeding.
The
following
are
considered
good
card handling
practices
and
are
recommended
to
be used
where
applicable:
1
If
cards exhibit
a
slight
distortion
due
to warping, the
machine
operator can
generally eliminate
this
condition
by
gently
bending
(fanning) the cards
back and
forth a
few
times.
2.
When
cards
are
removed
for use
from
storage trays
or
cartons, a
light
fanning action
on
each handful of
cards,
prior
to
placement
in
the card
hopper
will
help to
remove
card
lint,
etc.,
and
facilitate
alignment
in
the
hopper.
3.
Cards
stored
in
trays for
later
use
should be kept under
pressure to
reduce
the
possibility
of
warping.
For
additional
information concerning proper
card
stor-
age
criteria,
please
contact
your
local
IBM
branch
office.
Checking
Registration
The
punching
registration
of
the
machine should be
checked
regularly,
to
ensure
optimum
performance
during
verification
and
reading
of
the cards
in
other machines.
Punch
a card
in
all
80 columns and
check
the
registrations
with
a
card
gage.
(See Figure
9.)
Off-gage
punching
causes
difficulty
when
the cards pass
through
other types
of
machines.
Figure
9.
Using
Card Gage
False
"Errors"
(Verify
Mode)
Checks:
1
Registration
of
punched
cards.
2.
Proper keyboard
shift
(programmed
or manual).
3.
Warped
or
damaged
cards that
may
feed
and/or read
improperly.
4.
"Transparent"
spots
on
the cards that
result in
"reading
through" where
no punched
hole
exists.
Checking Reading
Accuracy-
False
"Errors"
To
check any
case
of
suspected
false
errors
or
off-punched
cards:
1.
Perform
data read operation,
by
feeding
a
card
from
the
hopper,
so that
manual
insertion
will
not
affect
registra-
tion.
See
"Data
Read
for
New
Master
Card
Information"
in
Section
3.
2.
Duplicate the record
into a
blank
card,
and compare
the
punched
card
with
the
original
card to
determine any
differences
caused
by
improper
reading
by
the
machine,
or
improper
punch-registration
of
the
original card.
38
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