IPC-TM-650 EN 2022 试验方法--.pdf - 第684页
NASA General Specification No. SP-R-0022 ASTM E 595 Material in this T est M ethods Manual was voluntarily establis hed by T echni cal Committees of IPC. Thi s mat erial is a dvisory only and its use or adaptation is enti…
of one, even though there are four distinct comb patterns and
measurements.
7.1.2 Sample Sizes
The number of samples should not be
stipulated in the test method. The number should be in the
specifications referring to this test method. However, it is rec-
ognized that there will be users who are attempting process
or material characterization and may be uncertain about how
many samples to specify.
With respect to the second bulleted item in the scope, (Pro-
vide metric(s) that can appropriately be used for binary classi-
fication (e.g., go/no go, pass/fail), a minimum sample size of
10 is suggested.
With respect to the third bulleted item in the scope, (Compare,
rank or characterize materials and processes) a minimum
sample size of three is suggested.
7.1.3
When characterizing material, samples can be pro-
cessed on the same panel.
7.1.4
When characterizing process(es), samples should at a
minimum be processed on different panels, preferably in dif-
ferent production runs.
7.2
The derived unit of surface resistivity and its expression
as ohm/square cannot be defined for this method or similar
methodologies due to the nonlinear response of the test
vehicles and the assumed nonhomogeneous concentration of
ionic contaminates.
7.3
Careful considerations must be used when developing
an implementation of this method. Seemingly adequate set-
ups can (and historically have) caused unacceptable uncer-
tainty of results. If the user of this method is not intimately
familiar with the technologies involved, ASTM D 257 and IPC-
9201 are highly recommended.
Number
2.6.3.7
Subject
Surface Insulation Resistance
Date
03/07
Revision
IPC-TM-650
Page
4
of
4
NASA General Specification No. SP-R-0022
ASTM E 595
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 2
r
ASSOCIATION
CONNECTING
/
ELECTRONICS
INDUSTRIES
®
221
5
Sanders
Road
Northbrook,
IL
60062-6135
IPC-TM-650
TEST
METHODS
MANUAL
Number
2.6.4
Subject
Outgassing,
Printed
Boards
Date
Revision
05/04
B
Originating
Task
Group
Rigid
Printed
Board
Performance
Task
Group
(D-33a)
1
Scope
This
test
method
is
used
to
determine
the
total
mass
loss
(TML)
and
collected
volatile
condensable
material
(CVCM)
of
materials
when
exposed
to
a
heated
vacuum
envi¬
ronment.
Mass
loss
may
be
due
to
outgassing
of
low
molecu¬
lar
weight
materials
present
in
printed
boards
such
as
trapped
plating
solutions,
improper
lamination,
and
uncured
adhesives
which
are
known
to
cause
contamination
or
corrosion
of
spacecraft
equipment.
2
Applicable
Documents
Vacuum
Sta¬
bility
Requirements
of
Polymeric
Material
for
Spacecraft
Appli¬
cation.
Standard
Test
Method
for
Total
Mass
Loss
and
Collected
Volatile
Condensable
Materials
from
Outgassing
in
a
Vacuum
Environment.
3
Test
Specimens
The
test
specimen
shall
be
cut
into
small
pieces
that
can
fit
into
the
specimen
boats
and
whose
total
mass
shall
be
about
200
mg.
If
smaller
masses
are
used
the
accuracy
of
the
TML
and
CVCM
determinations
may
be
impaired.
It
is
imperative
that
the
specimens
not
be
contami¬
nated
during
the
preparation
process.
Specimens
are
not
to
be
handled
with
bare
hands
since
human
skin
oils
are
volatile
and
condensable
by
this
method
thereby
creating
misleading
TML
and
CVCM
results.
If
there
is
any
doubt
about
specimen
contamination
the
specimens
should
be
cleaned
using
sol¬
vents
known
to
be
non
reactive
and
that
leave
no
residue.
An
average
of
at
least
three
(3)
samples
shall
be
made
for
each
test.
4
Apparatus
or
Material
4.1
Multiple
specimen
vacuum
chamber
capable
of
main¬
taining
a
vacuum
of
at
least
7
X
10-3
Pa
(5
X
10-5
Torr)
with
resistance
heated
copper
bars
capable
of
maintaining
1
25
土
1
[257
±
1.8
°F]
during
the
24
hour
test
run
and
typi¬
cally
containing
24
specimen
chambers.
Typically,
three
(3)
of
the
specimen
chambers
are
maintained
as
controls.
The
open
end
of
each
specimen
chamber
allows
vapors
from
the
speci¬
men
to
pass
through
a
hole
into
a
collector
chamber
where
the
vapors
are
condensed
on
a
collector
plate
that
is
main¬
tained
at
25
±
1
[77
°F
±
2
°F)
throughout
the
test.
See
ASTM
E
595
for
further
details
and
requirements
for
the
con¬
struction
and
cleaning
of
the
test
apparatus.
4.2
An
analytical
balance
capable
of
measuring
the
speci¬
mens,
boats,
and
collector
plate
mass
to
the
nearest
micro¬
gram
(0.000001
gram).
4.3
Glass
desiccator
using
active
silica
gel
desiccant.
Low
vapor
pressure
grease
shall
be
used
for
the
ground
glass
joints.
4.4
Conditioning
chamber
capable
of
maintaining
50%
±
5%
relative
humidity
and
23
±
2
[73
°F
±
4
°F).
4.5
Prepared
aluminum
foil
specimen
boats.
4.6
Suitable
cleaning
solvents
Mixtures
of
1:1:1
by
vol¬
ume
chloroform
:acetone:
ethanol
and
1
:1
by
volume
acetone:
ethanol
solvent
blends
have
been
successfully
used
for
cleaning
and
degreasing
the
apparatus,
aluminum
boats,
and
collector
plates.
All
solvents
shall
be
spectrophotometer
grade
purity
or
equivalent.
See
Annex
A1
of
ASTM
E
595
for
details
regarding
cleaning
and
storage
procedures
for
the
equipment
used
in
this
test.
4.7
Nitrogen
gas,
99.9%
pure,
or
better,
with
a
dew
point
of
-60
[-76
°F]
or
less.
The
nitrogen
gas
shall
be
filtered
using
a
Molecular
Sieve
5A
or
equivalent.
4.8
Wiping
materials
and
swabs
for
cleaning.
These
material
shall
be
preextracted
using
solvents
with
which
they
will
be
used.
4.9
Suitable
gloves
or
finger
cots
to
be
used
during
sample
preparation.
5
Procedure
5.1
Weigh
a
prepared
aluminum
foil
boat
to
the
nearest
microgram
and
return
it
to
the
glass
storage
desiccator.
5.2
Weigh
a
prepared
collector
plate
to
the
nearest
micro¬
gram
and
mount
it
into
its
cooling
plate
receptacle.
5.3
Add
the
test
specimen
to
the
boat
and
condition
the
specimen
at
50%
±
5%
relative
humidity
at
23
±
2
[73
°F
±
4
°F]
for
a
minimum
of
24
hours.
Weigh
the
condi¬
tioned
specimen
and
boat
to
the
nearest
microgram.
IPC-TM-650
Page 2 of 2
Number
2.6.4
Subject
Outgassing,
Printed
Boards
Date
05/04
Revision
B
5.4
Exposure
5.4.1
Prior
to
operation,
all
temperature-vacuum
apparatus
such
as
the
heating
bar,
separators,
and
cooling
plates
shall
be
clean
and
aligned.
5.4.2
Place
the
test
specimen
and
boat
into
the
specimen
compartment
in
the
temperature-vacuum
system.
Mount
the
respective
cover
plates
of
each
specimen
compartment
and
at
least
three
(3)
control
compartments.
5.4.3
Close
and
activate
the
vacuum
system
and
allow
the
system
to
evacuate
to
7.0
X
10-3
Pa
(5
X
10-5
Torr)
or
less
within
one
hour.
During
this
period,
control
of
the
collector
plate
temperature
at
25
±
1
[77
°F
±
2
°F]
shall
be
achieved.
5.4.4
When
the
required
vacuum
has
been
achieved,
turn
on
the
heater
bar
and
adjust
the
controller
to
heat
the
bar
to
125
℃
±
1
℃
[257
°F
±
2
°F]
within
60
minutes.
5.4.5
Maintain
the
collector
plate
temperatures
at
25
±
1
[77
°F
±
2
°F]
and
the
heater
bar
temperature
at
125
土
1
[257
°F
±
2
°F]
for
24
hours.
After
this
time
period
close
the
vacuum
valve
to
the
pumping
system
and
turn
off
the
cur¬
rent
to
the
heater
bars.
5.4.6
Open
the
vent
valve
and
backfill
with
clean,
dry
nitro¬
gen
at
a
gage
pressure
of
10
to
30
kPa
(2
to
4
psi)
above
atmosphere
to
rapidly
cool
the
bars
to
50
[1
22
°F]
within
two
hours,
nominally.
5.4.7
Turn
off
the
collector-plate
heat
exhchangers,
return
the
vacuum
chamber
to
room
pressure
using
clean,
dry
nitro¬
gen,
and
open
the
chamber.
Remove
the
aluminum
specimen
boats
and
their
respective
collector
plates
and
the
control
col¬
lector
plates
and
immediately
store
in
the
dry
desiccator
(see
4.3).
5.4.8
After
allowing
the
specimens
to
cool
to
approximately
room
temperature,
but
after
no
more
than
1/2
hour,
weigh
the
specimens
and
boats
and
the
collector
plates
to
the
nearest
1
microgram
within
two
minutes
of
removal
from
the
desicca¬
tors.
5.5
Evaluation
of
Test
5.5.1
Measurements
of
the
control
collector
plates
are
used
to
detect
contamination
and/or
poor
technique.
Mass
loss
of
greater
than
20
micrograms
is
an
indication
of
poor
cleaning
of
the
collector
plates.
Mass
gain
of
greater
than
50
micro¬
grams
is
an
indication
of
poor
cleaning
of
elements
of
the
apparatus,
cross
contamination
between
specimen
compart¬
ments,
or
poor
vacuum
technique.
Any
change
of
50
micro¬
grams
or
greater
calls
for
a
review
of
or
change
in
technique.
All
data
obtained
during
such
runs
shall
be
discarded
and
the
test
rerun
when
the
system(s)
are
corrected.
5.5.2
Calculation
of
Total
Mass
Loss
(TML).
Calculate
the
TML
as
follows:
Initial
Mass
Final
Mass
Specimens
Weights:
S
=
+
B)
-
B
Sf
二
(SF
+
B)
-
B
Mass
Loss
(L)
=
S,
-
SF
Total
Mass
Loss
(TML)
(%)
二
(
L/S)
X
100
Where:
B
=
Mass
of
boat
in
grams
S|
=
Initial
specimen
mass
in
grams
SF
二
Final
Specimen
mass
in
grams
L
=
Mass
Loss
in
grams
5.5.3
Calculate
the
Collected
Condensable
Volatile
Material
(CVCM)
as
follows:
Mass
of
condensable
material
(Co)
二
CF
-
C,
CVCM
(%)
=
(CJS)
X
100
Where:
CF
二
Final
mass
of
collector
plate
in
grams
C|
=
Initial
mass
of
collector
plate
in
grams
Co
二
Mass
of
condensable
material
in
grams
S|
=
Initial
specimen
mass
in
grams
6
Notes
6.1
A
useful
outgassing
test
data
sheet
format
can
be
found
in
Appendix
X1
of
ASTM
E
595.
6.2
Additional
information
regarding
this
test
method
and
suggested
requirements
for
certain
spacecraft
applications
can
be
found
in
NASA
SP-R-0022.