IPC-TM-650 EN 2022 试验方法--.pdf - 第13页

For example: For example: 3 m [120 in] 3.0 m [1 18 in] 9.17 m [30.09 ft] 2 mm [0.079 in] 66 µm [2.60 mil] 725 µm [28.54 mil] or [0.02854 in ] 3.8 X 10 -6 m [1.50 X 10 -4 in] Material in this T est M ethods Manual was vol…

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IPC-TM-650
Page 2 of 2
Number
1.5
Subject
Reporting,
Format
Date
01/03
Revision
A
Recommendations
If
applicable
and
if
possible,
this
section
is
used
to
recom¬
mend
needed
corrections
or
to
indicate
discrepancies
in
the
design
of
the
specimen,
which
was
tested.
Care
should
be
taken
to
limit
the
recommendations
to
those
things
indicated
by
the
test,
and
not
go
into
design
problems,
which
are
the
responsibility
of
the
designer.
For example:
For example:
3 m [120 in]
3.0 m [118 in]
9.17 m [30.09 ft]
2 mm [0.079 in]
66 µm [2.60 mil]
725 µm [28.54 mil] or
[0.02854 in]
3.8 X 10
-6
m [1.50 X 10
-4
in]
Material in this Test Methods Manual was voluntarily established by Technical Committees of IPC. This material is advisory only
and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this
material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.
Equipment referenced is for the convenience of the user and does not imply endorsement by IPC.
Page 1 of 1
r
ASSOCIATION
CONNECTING
/
ELECTRONICS
INDUSTRIES
®
221
5
Sanders
Road
Northbrook,
IL
60062-6135
IPC-TM-650
TEST
METHODS
MANUAL
The
following
guidelines
should
be
used
for
numerical
report¬
ing:
1
.
Follow
the
I
PC
policy
for
the
use
of
metric
and
English
units.
In
an
effort
to
prepare
the
industry
for
a
full
change
to
complete
metric
measurements
in
I
PC
standards
and
specifications,
the
Technical
Activities
Executive
Commit¬
tee
(TAEC)
voted
on
a
new
way
for
both
to
be
included.
Through
this
new
metric
conversion
policy,
IPG
docu¬
ments
will
have
hard
metric
numbers
and
parenthetical
soft
imperial
numbers
with
appropriate
units.
The
hard
metric
numbers
will
represent
accuracy
of
the
numerical
values
as
decided
by
the
working
committee/
task
group
according
to
their
respective
contexts.
The
working
committee/task
group
will
decide
whether
a
hard
metric
number
should
be
represented
as:
1
.3
mm
(any
value
within
the
range
of
1
.25
mm
to
1.34
mm
is
acceptable),
or
1
.30
mm
(any
value
within
the
range
of
1
.295
mm
to
1.304
mm
is
acceptable).
The
soft
imperial
numbers
will
have
one
significant
digit
more
than
the
metric
numbers
to
capture
the
accuracy
represented
by
the
metric
numbers.
3
m
(one
significant
digit)
converts
to
1
18.1
102
in,
which
will
be
documented
as
(two
significant
dig¬
its
because
the
zero
is
a
placeholder).
3.0
m
(two
significant
digits)
converts
to
1
18.1
102
in,
which
will
be
documented
as
(three
sig¬
nificant
digits).
9.17
m
(three
significant
digits)
converts
to
30.0853
ft,
which
will
be
documented
as
(four
sig¬
nificant
digits
because
all
zeros
embedded
between
non¬
zero
digits
are
significant).
Number
1.6
Subject
Numerical
Reporting
Date
Revision
01/03
A
Originating
Task
Group
N/A
2
mm
(one
significant
digit)
converts
to
0.07874016
in,
which
will
be
documented
as
(two
sig¬
nificant
digits
because
the
zeros
are
placeholders
used
to
locate
the
decimal
point).
66
pm
(two
significant
digits)
converts
to
0.002598425
in,
which
will
be
documented
as
(three
significant
digits
because
the
non-truncated
zero
/s
not
a
placeholder).
725
pm
(three
significant
digits)
converts
to
0.02854331
in,
which
will
be
documented
as
(appropriate
units
are
determined
by
the
context
of
numerical
values
and
both
have
four
significant
digits).
3.8
X
10-6
m
converts
to
1
.496063
X
10-4
in,
which
will
be
documented
as
(if
sci¬
entific
numerical
format
is
appropriate).
2.
Spell
out
numbers
one
through
ten,
except
in
use
with
measurement
and
time.
3.
Spell
out
any
numbers
at
the
beginning
of
a
sentence.
4.
When
reporting
numbers
less
than
a
whole
number,
place
a
zero
to
the
left
of
the
decimal
point.
5.
Report
average
results
to
the
same
amount
of
significant
figures
as
the
numbers
being
averaged.
6.
When
readings
reach
maximum
of
test
equipment
or
maximum
of
practical
values,
precede
the
number
with
greater
than''
or
and
explain
the
reason
for
not
going
to
the
limit.
7.
Always
report
results
in
the
same
unit
of
measurement
as
that
of
the
requirement.
8.
In
reporting
ranges
use
the
preposition
"to,''
not
a
hyphen
as:
3
cm
to
9
cm.
9.
Report
portions
of
a
unit
of
measure
in
the
singular.
10.
Mark
a
failed
result
in
such
a
way
as
it
will
stand
out
to
the
reader.
Later
state
what
this
marking
signifies.
11
.
When
tabulating,
use
clearly
defined
headings.
12.
Clarify
when
more
than
one
set
of
numbers
is
in
a
tabu¬
lation
of
statement.
Material in this Test Methods Manual was voluntarily established by Technical Committees of IPC. This material is advisory only
and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this
material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.
Equipment referenced is for the convenience of the user and does not imply endorsement by IPC.
Page 1 of 1
r
ASSOCIATION
CONNECTING
/
ELECTRONICS
INDUSTRIES
®
221
5
Sanders
Road
Northbrook,
IL
60062-6135
IPC-TM-650
TEST
METHODS
MANUAL
In
interpreting
test
results,
it
is
essential
that
all
values
are
known
to
be
valid.
Usually
the
values
are
placed
in
one
of
the
three
following
categories
and
evaluated
to
ultimately
arrive
at
a
sound
decision:
a.
Results
are
declared
valid.
A
decision
can
be
made
imme¬
diately
b.
Results
obviously
must
be
discarded.
Specimens
that
break
or
otherwise
fail
because
of
some
obvious
flaw,
or
that
do
not
behave
in
the
same
general
manner
as
the
other
specimens,
should
be
discarded.
Retests
should
be
performed
on
new
specimens.
c.
Results
deviate
from
the
mean
value.
All
test
data
obtained
from
properly
performed
tests
must
be
included
in
deter¬
mining
mean
and
standard
deviation
unless
there
is
an
assignable
cause
not
to
do
so.
The
above
information
is
to
be
used
if
not
found
in
an
indi¬
vidual
test
method.
Number
1.7
Subject
Reporting,
Invalid
Test
Results
Date
Revision
01/03
A
Originating
Task
Group
N/A