IPC-TM-650 EN 2022 试验方法--.pdf - 第740页
Note: IPC-TM-650 Number Subject Date Revision Page 2 of 3 2.6.23 Test Procedure for Steam Ager Temperature Repeatability 7/93 Each thermocouple shall be secured using positive mechani¬ cal means. For example, the thermoc…
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Page 1 of 3
IPC-TM-650
TEST
METHODS
MANUAL
1
.0
Scope
This
test
procedure
measures
the
temperature
repeatability
inside
steam
agers
used
to
condition
compo¬
nents
prior
to
solderability
testing.
It
should
be
applied
at
installation
and
after
any
modification
to
the
equipment
and/or
its
location.
2.0
Applicable
Documents
IPC-PC-90
General
Requirements
for
Implementation
of
Statistical
Control
MIL-STD-202
Test
methods
for
Electronics
and
Electrical
Components
Parts
MIL-STD-750
Test
Methods
for
Semiconductor
Devices
MIL-STD-883
Test
Methods
of
Microelectronics
MIL-STD-45662
Calibration
Systems
Requirements
ANSI/ASQC
Z1.1
Guide
for
Quality
Control
Charts
ANSI/ASQC
Z1.2
Control
Chart
Method
of
Analyzing
Data
ANSI/ASQC
Z1.3
Control
Chart
Method
of
Controlling
Quality
During
Production
ANSI/J-STD-002
Solderability
Tests
for
Components
Leads,
Terminations,
Lugs,
Terminals
and
Wires
3.0
Test
Specimens
None
required
4
.0
Apparatus
The
following
test
equipment
shall
be
used
during
the
tests:
4.1
Type
T
copper-constantan
thermocouple
wire,
24
AWG,
±0.5℃
[±0.09°F]
accuracy
minimum,
premium
grade.
PTFE
insulation
is
preferred.
4.2
Thermocouple
Temperature
Indicator,
with
an
accuracy
of
±0.5℃
[±0.9°F]
minimum,
with
capability
for
type
T
thermo¬
couples,
and
be
calibrated
in
accordance
with
MIL-
STD-
45662
or
the
equivalent.
It
is
recommended
that
the
thermocouple
indicator
have
capability
to
log
data
and
be
able
to
take
all
readings
within
2
minutes.
Number
2.6.23
Subject
Test
Procedure
for
Steam
Ager
Temperature
Repeatability
Date
Revision
7/93
Originating
Task
Group
Since
readings
must
be
taken
periodically,
it
is
recommended
that
the
indicator
have
capability
for
pre-settable
time
delay
between
measurements.
Although
the
specific
equipment
used
to
develop
this
method
was
as
specified
above,
other
thermocouple
types
and
temperature
indicators
may
be
used
provided
the
require¬
ments
of
5.1
are
met.
4.3
Hot
plate
with
500
ml
glass
beaker
4.4
The
steam
ager
as
used
to
perform
component
solder¬
ability
testing
per
MIL-STD-202,
Method
208;
MIL-STD-883,
Method
2003;
or
MIL-STD-750,
Method
2026;
or
ANSI/J-
STD-002
as
applicable.
5.0
Test
Procedure
5.1
Thermocouple
Calibration
All
thermocouples
to
be
used
during
the
steam
ager
test
shall
first
be
checked.
Loosely
bundle
the
thermocouples
and
place
in
a
500
ml
glass
beaker
of
vigorously
boiling
water,
heated
by
a
hot
plate.
Measure
the
temperature
indicated
by
each
thermocouple.
All
thermocouples
should
indicate
the
same
temperature
±0.5℃
[±0.9°F]
to
the
local
boiling
point
of
water.
If
any
thermocouple
differs
by
more
this
amount,
the
weld
bead
shall
be
reworked
(and
all
thermocouples
reverified),
or
the
thermocouple
shall
be
discarded
for
the
purpose
of
this
test.
5.2
Install
Thermocouples
Install
the
thermocouples
in
the
ager
at
the
component
level.
All
thermocouple
weld
beads
shall
be
at
the
same
height
±6.35
mm
[±0.25
in].
The
distance
from
the
weld
to
the
water
shall
be
measured
prior
to
the
test.
All
thermocouples
shall
be
at
least
25.4
mm
[1
in]
away
from
any
wall
or
bulkhead.
The
thermocouples
should
be
distrib¬
uted
evenly
around
the
normal
working
area
inside
the
ager,
and
the
location
shall
be
recorded.
Ten
thermocouples
shall
be
used
in
larger
agers,
eight
in
smaller
agers.
For
example,
if
the
ager
uses
five
small
drawers,
a
thermocouple
centered
in
the
front
and
back
halves
of
the
drawer
would
be
sufficient.
If
no
drawers
are
used,
the
thermocouples
should
be
distrib¬
uted
around
the
areas
where
parts
are
usually
placed.
Note:
IPC-TM-650
Number
Subject Date
Revision
Page 2 of 3
2.6.23
Test
Procedure
for
Steam
Ager
Temperature
Repeatability
7/93
Each
thermocouple
shall
be
secured
using
positive
mechani¬
cal
means.
For
example,
the
thermocouple
wire
could
be
wound
around
a
piano
wire
secured
across
the
width
of
the
ager.
The
natural
airflow
within
the
ager
should
be
preserved.
Extra
baffles
or
wire
mesh
screens
should
not
be
included
for
this
test,
if
not
used
during
regular
solderability
testing.
Venting
should
be
preserved
as
it
is
during
normal
testing.
The
end
of
the
thermocouple,
including
the
weld
bead
and
exposed
wires,
should
be
oriented
vertically
(pointing
upward)
to
prevent
water
drops
from
collecting
on
them.
5.3
Performing
the
Test
Turn
on
the
ager
and
allow
to
stabilize
until
measurement
procedures
used
during
regular
testing
indicate
stability
has
been
achieved.
Four
hours
is
usually
required
in
most
agers
to
achieve
stability,
and
this
,,warmup^^
time
should
be
included
in
the
production
part
test
procedure.
Start
the
test,
logging
temperature
every
15
minutes
for
8
hours,
(if
the
data
clearly
indicates
that
the
natural
variability
within
the
chamber
varies
more
quickly,
the
sampling
fre¬
quency
can
be
increased
as
necessary)
When
logging
temperatures,
all
thermocouples
should
be
measured
simultaneously,
or
within
2
minutes
maximum.
Temperatures
shall
be
recorded
in
degrees
Celsius.
Measure
temperature
to
the
nearest
0.1
degree.
The
steam
agers
shall
not
be
disturbed
during
the
test,
except
for
routine
maintenance
or
inspection
procedures;
as
used
during
normal
testing.
The
ager
shall
be
tested
without
other
components
inside.
5.4
Test
Conditions
Test
the
temperature
stability
at
the
temperature
set
point
used
for
solderability
testing.
5.5
Data
Analysis
5.5.1
Record
the
following
data
for
each
test.
a.
Ager
manufacturer
and
model
number
b.
Temperature
indicator
type,
date
of
calibration
c.
Test
date
d.
Sampling
frequency
e.
Total
vent
area
on
chamber
lid
[sq.cm]
f.
Total
chamber
cross-sectional
surface
area
[sq.cm]
g.
Total
volume
of
air
in
chamber
[cu.cm]
h.
Set
point
temperature
i.
Test
location
i.
in
hood
ii.
on
table
against
wall
iii.
on
table
in
open
room
j.
Location
of
room
air
conditioning
vents
(include
sketch)
k.
Notes
on
any
special
conditions
during
test
I.
Distance
from
thermocouples
to
water
level
m.
Location
of
thermocouples
inside
ager
(include
sketch)
n.
Room
temperature
when
testing
5.5.2
Test
Data
Prepare
a
matrix
of
test
data,
showing
temperature
of
each
thermocouple
at
each
sampling
interval.
5.5.3
Control
Charts
Prepare
X-bar
and
R
charts
with
appropriate
control
limits.
A
control
limit
calculation
form
is
shown
in
Appendix
1.
Further
instructions
on
preparation
of
control
charts
can
be
found
in
I
PC-
PC-90
or
ANSI/ASQC
Z1.1, Z1.2,
and
Z1.3.
Subgroups
shall
consist
of
all
thermocouples
placed
in
the
ager
(8
or
10),
and
which
are
measured
simultaneously
during
the
test.
The
charts
shall
be
considered
out
of
control
if
any
of
the
fol¬
lowing
applies:
a.
any
one
data
point
is
beyond
the
control
limits
b.
any
2
or
3
consecutive
points
are
near
a
control
limit
(outer
third)
c.
a
run
of
8
or
more
points
is
above
or
below
the
center
line
d.
a
run
of
6
or
more
points
is
increasing
or
decreasing
5.5.4
Process
Capability
Histogram
Prepare
a
process
capability
histogram,
using
data
ranges
of
1/2℃
or
less.
Estimate
the
mean
and
standard
deviation
of
the
data.
5.5.5
Process
Capability
Index
Calculate
the
process
capability
index,
Cp
using
the
equation
shown
below
(from
IPC-PC-90
example
7.5.
6.2)
for
specification
limits
of
±1℃
[±1.8°F],
±2℃
[±3.6°F],
±3℃[±5.4°F]
and
±4℃[±7.2°F].
Cp
=
USL-LSL
-
6S
Where,
Cp
二
capability
index
USL
=
upper
specification
limit
LSL
=
lower
specification
limit
S
=
process
standard
deviation
Include
a
plot
of
Cp
against
specification
tolerance
range.
IPC-TM-650
Number
Subject Date
Revision
Page 3 of 3
7/93
2.6.23
Test
Procedure
for
Steam
Ager
Temperature
Repeatability
6.0
Notes
6.1
Care
should
be
exercised
when
interpreting
analysis
results.
Cp
may
not
be
meaningful
if
the
X-bar
or
R
charts
are
out
of
control,
or
the
process
capability
histogram
is
grossly
non-normal.
Consult
IPC-PC-90
or
ANSI/ASQC
Z1
.1
,
Z1
.2
and
Z1
.3
for
further
details.