IPC-TM-650 EN 2022 试验方法--.pdf - 第813页

Figure 2 Method of Making Contact Resista nce Measurements IPC-TM-650 Page 2 of 2 Number 3.16 Subject Fretting Corrosion, Connectors Date 2/78 Revision 5.2 Evaluation 5.2.1 Record and report resistance vs. number of rock…

100%1 / 824
Note:
Figure 1 Fretting Motion to be Applied to PCB
Connectors
Material in this Test Methods Manual was voluntarily established by Technical Committees of the 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 the IPC.
Page 1 of 2
ASSOCIATION
CONNECTING
/
ELECTRONICS
INDUSTRIES
221
5
Sanders
Road
Northbrook,
IL
60062-61
35
IPC-TM-650
TEST
METHODS
MANUAL
1
Scope
The
purpose
of
this
test
method
is
to
determine
the
susceptibility
of
non-noble
metal
contact
interfaces
to
the
phenomena
of
fretting
corrosion.
Fretting
corrosion
is
an
accelerated
oxidation
of
contact
surfaces
brought
about
by
small
amplitude
cyclic
relative
motions
between
mating
con¬
tacts.
In
this
test,
a
driving
motion
is
imposed,
which
tends
to
cause
relative
motion
at
the
contact
surfaces.
From
contact
resistance
measurements,
one
determines
whether
the
result¬
ing
contact
motion,
if
any,
generates
significant
or
detrimental
films
in
the
contact
interface.
2
Applicable
Documents
None
3
Test
Specimens
3.1
Any
pre-production
or
production
connectors
4
Equipment/Apparatus
4.1
Clamping
fixture
for
test
connector(s)
and
test
boards
to
mate
with
test
connectors
or,
in
the
case
of
post
receptacles,
postheaders
4.2
A
motorized
cam,
crank,
or
other
mechanism,
with
appropriate
linkage,
must
be
provided
to
physically
attach
to
the
movable
connector,
test
board,
or
post
and
rock
this
half
back
and
forth
as
illustrated
in
Figure
1
.
The
rocking
motion
shall
be
approximately
10
cycles
per
minute,
but
no
faster
than
30
cycles
per
minute.
4.3
The
mechanism
must
be
adjustable
so
as
to
restrict
the
amplitude
of
motion
to
one,
which,
in
the
case
of
a
PCB
sys¬
tem,
just
lets
the
board
touch
the
card
slot
in
the
connector
on
each
side.
4.4
A
counter
to
record
the
number
of
rocking
cycles
should
be
provided.
4.5
A
means
of
measuring
contact
resistance
must
be
pro¬
vided.
Dry
circuit
measuring
conditions
are
to
be
maintained,
with
open-circuit
voltages
of
50mv
or
less
and
test
currents
of
100
ma
or
less.
A
Keithley
Model
503
milliohmmeter
or
its
equivalent
may
be
used.
Number
3.16
Subject
Fretting
Corrosion,
Connectors
Date
Revision
2/78
Originating
Task
Group
Move
PC
board
back
and
forth,
so
that
the
board
touches
the
card
slot
edges
on
both
sides.
Printed
wiring
board
Connector
IPC-3-16-1
5
Procedure
5.1
Test
5.1.1
Contacts
are
to
be
assembled
in
their
housings
as
in
normal
intended
usage.
5.1.2
New
test
connectors,
boards,
or
posts
are
to
be
used
in
each
test.
5.1.3
Measure
and
record
initial
resistance
after
inserting
test
connector(s),
board(s),
or
post(s).
5.1.4
Attach
and
adjust
rocking
mechanism,
then
begin
rocking
cycles.
5.1.5
Stop
the
rocking
motion
and
measure
contact
resis¬
tance
after
10,
20,
50,
100,
200,
300,
400,
and
500
cycles.
Individual
contacts
are
to
be
measured
separately
(see
Figure
2).
A
millohmmeter
having
separate
current
and
voltage
leads
may
be
used
instead,
with
leads
positioned
as
shown
in
Figure
2.
Figure 2 Method of Making Contact Resistance Measurements
IPC-TM-650
Page 2 of 2
Number
3.16
Subject
Fretting
Corrosion,
Connectors
Date
2/78
Revision
5.2
Evaluation
5.2.1
Record
and
report
resistance
vs.
number
of
rocking
cycles.
6
Notes
6.1
Keithley
Model
503
Milliohmmeter
may
be
purchased
from:
KEITHLEY
INSTRUMENTS,
INC.
28775
Aurora
Road
Cleveland,
Ohio
44139
(216)
248-0400
Material in this Test Methods Manual was voluntarily established by Technical Committees of the 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 the IPC.
Page 1 of 1
r
ASSOCIATION
CONNECTING
/
ELECTRONICS
INDUSTRIES
2215
Sanders
Road
Northbrook,
IL
60062-6135
IPC-TM-650
TEST
METHODS
MANUAL
1
Scope
This
test
method
is
used
to
determine
the
effects
of
long
term
operation
of
components
in
atmospheres
con¬
taining
industrial
gaseous
pollutants.
It
consists
of
exposure
to
a
flowing-gas
humid
atmosphere
containing
SO2,
H2S,
and
H02
in
concentrations
of
200
parts
per
billion
(ppb).
This
cor¬
responds
to
a
worst-case
polluted
atmosphere,
and
is
an
accelerated
exposure
to
normal,
average
pollutant
level
atmo¬
sphere.
An
acceleration
factor
of
30-40
is
associated
with
this
test.
1
.2
To
further
simulate
and
accelerate
conditions
obtained
in
operating
environments,
the
test
also
involves
temperature
and
humidity
cycling,
so
as
to
cause
breathing
and
moisture
condensation
on
the
test
samples.
2
Applicable
Documents
None
3
Test
Specimen
3.1
Any
pre-production
or
production
samples
wired
and
mated
as
intended
for
actual
use
4
Apparatus
4.1
Test
chamber
and
its
associated
control
equipment
capable
of
producing
and
maintaining
the
conditions
of
4.1
.1
and
4.1
.2
4.1.1
Capable
of
cycling
the
temperature
between
68℃
and
26℃
with
the
following
schedule:
Eight
hours
at
68℃
One
hour
transition
to
26℃
Two
hours
at
26℃
One
hour
transition
to
68℃
These
1
2-hour
cycles
are
to
be
repeated
continuously
for
the
duration
of
time
specified
for
the
exposure.
4.1.2
Capable
of
maintaining
80%
RH
±
5%
RH
during
the
68℃
dwell
time.
Uncontrolled
during
temperature
transitions
so
as
to
allow
condensation
on
the
samples.
Number
3.17
Subject
Industrial
Gas
Test
(Battelle
Method),
Connectors
Date
Revision
2/78
Originating
Task
Group
4.2
Gaseous
Atmospheric
Pollutants
Concentrations
of
200
ppb
in
normal
air
(N2
-
20%
02)
of
the
following
pollutants
shall
be
maintained
in
the
exposure
chamber
at
all
times:
H
2s
(200
ppb)
S02
(200
ppb)
N02
(200
ppb)
A
convenient
and
satisfactory
way
of
producing
this
environ¬
ment
is
the
"Battelle
Flowing
Gas
System.”
In
this
system,
the
pollutant
concentrations
are
maintained
through
the
use
of
permeation
tubes,
which
are
small
Teflon
tubing
sections,
about
2
cm
long,
sealed
at
both
ends,
and
containing
the
pol¬
lutant
of
interest
as
a
liquid
at
room
temperature.
These
per¬
meation
tubes
are
placed
in
the
main
air
stream,
which
feeds
the
exposure
chamber,
and
the
concentrations
of
the
pollut¬
ants
are
determined
by
the
diffusion
rates
of
the
gas
out
of
the
permeation
tubes.
At
a
constant
flow
rate
and
temperature
of
the
main
air
stream,
the
concentration
of
pollutants
will
be
constant.
Periodic
weighing
of
the
permeation
tubes
may
do
pollutant
gas
“analysis.”
The
flow
rate
of
the
main
air
stream
is
such
that
the
exposure
chamber
volume
is
exchanged
approximately
every
30
min¬
utes.
5
Procedure
5.1
Wire
and
mate
the
test
specimen
as
in
normal
intended
operation
during
exposure
in
this
test.
5.2
The
duration
of
this
test
is
generally
calculated
from
the
expected
service
lifetime
of
the
product.
5.3
The
actual
duration
of
this
exposure
is
to
be
determined
between
vendor
and
user
and/or
is
a
part
of
the
applicable
product
specification.
A
60-day
exposure
in
this
test
corre¬
sponds
to
approximately
six
years
of
exposure
in
normal
industrial
environments.
6
Notes
6.1
Reference
Abbott,
W.
H.,
Effects
of
Industrial
Air
Pol¬
lutants
on
Electrical
Contact
Materials,
Holm
Seminar
on
Elec¬
tric
Contact
Phenomena,
November
1973.