IPC-TM-650 EN 2022 试验方法-- - 第666页

5.5.4 Apply a reverse polarization potential of 500 ± 50 volts dc with the resista nce meter for o ne minute. Next, tak e the measurements at 500 volts dc ± 50 vo lts dc between each pair of terminals, 1 to 2, 2 to 3, 3 …

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5 Procedure
5.1 Test Conditions
5.1.1
The test conditions be set at 65 °C ± 2 °C [149
°F ± 3.6 °F]; 85% – 93% RH for a minimum of 96 hours.
5.2 Specimen Preparation
5.2.1
Permanently identify each test specimen.
5.2.2
Visually inspect the test specimens for any obvious
defects, as described in IPC-A-600. If there is any doubt
about the overall quality of a test specimen, it should be
discarded.
5.2.3
Solder single-stranded PTFE or other fluorocarbon
insulated wire to each land of the test specimen. As flux resi-
due is of great concern with this test, soldering should initially
be attempted without use of any flux. If flux is required by
qualitative observation, use rosin (RO), low activity flux. The
solder and/or rosin must not spread beyond the land areas.
These wires will be used to connect each land for polarization
and for insulation resistance testing. The test pattern
exhibit any spatter of the flux or solder. It is recommended
to cover or otherwise protect the test patterns during the sol-
dering operation.
5.2.4
Spray rinse thoroughly with deionized water. Hold test
specimen at an approximate 30° angle and spray from top to
bottom.
5.2.5
Immerse the test specimen in deionized water and
scrub with a soft bristle brush for a minimum of 30 seconds.
During the remainder of the specimen preparation, handle test
specimens by the edges only.
5.2.6
Immerse the test specimen in clean, virgin isopropyl
alcohol and agitate for a minimum of 30 seconds. Scrub with
a soft bristle brush to remove flux residue. Rinse specimen
thoroughly with clean isopropyl alcohol.
5.2.7
Dry the cleaned test specimens in a drying oven for a
minimum of three hours at 49 °C - 60 °C [120 °F - 140 °F].
5.3 Initial Insulation Resistance Measurement at Stan-
dard Laboratory Conditions (Ambient)
5.3.1
Condition test specimens a minimum of 24 hours at
standard laboratory conditions of 23 °C ± 5 °C [73 °F ± 9 °F]
and 50 % ± 10 % relative humidity. This is Test Condition A.
5.3.2
Take an initial insulation resistance measurement
between each pair of terminals, 1 to 2, 2 to 3, 3 to 4, and 4
to 5 at standard laboratory conditions. Before taking the mea-
surement, apply a polarizing potential of 500 volts dc ± 50
volts dc, with the resistance meter for one minute, then take
the measurement at 500 volts dc ± 50 volts dc.
5.4 Insulation Resistance Measurement at Elevated
Temperature and Humidity
5.4.1
Place the test specimens from Test Condition A in the
test chamber, in a vertical position parallel to airflow, and
under a condensation drip shield. Apply a 100 volt dc
polarization potential to each pair of terminals of the test
specimens.
5.4.2
Expose the material test specimens to the conditions
of 65 °C ± 2 °C [149 °F ± 3.6 °F] and 85% -93% relative
humidity for a minimum of 96 hours.
5.4.3
Disconnect the 100 volt dc polarization potential.
5.4.4
Apply a reverse polarization potential of 500 ± 50 volts
dc with the resistance meter for one minute, then take the
measurement at 500 volts dc ± 50 volts dc between each pair
of terminals, 1 to 2, 2 to 3, 3 to 4, and 4 to 5, of the test
specimen.
5.4.5
Measure and record the insulation resistance at the
end of the nominal 96 hour conditioning period. These tests
are to be conducted without opening the test chamber.
5.5 Insulation Resistance Measurement after Recovery
from Elevated Temperature and Humidity
5.5.1
Remove the test specimens from the test chamber
after disconnecting the bias voltage (100 volts dc).
5.5.2
Stabilize the test specimens, at the following condi-
tions: 23 °C ± 5 °C [73.4 °F ± 9 °F] and 50% ± 10% relative
humidity, for 24 hours [+ 0.5 hours / - 0 hours].
5.5.3
Take the insulation resistance measurements and
record such at laboratory ambient temperature at 23 °C ±
5 °C [73.4 °F ± 9 °F] after the above stabilization conditioning.
Number
2.6.3.2
Subject
Surface Insulation and Moisture Resistance, Copper Clad
Flexible Dielectric Material
Date
8/14/15
Revision
C
IPC-TM-650
—
shall
not
shall
Page
2
of
3
5.5.4
Apply a reverse polarization potential of 500 ± 50 volts
dc with the resistance meter for one minute. Next, take the
measurements at 500 volts dc ± 50 volts dc between each
pair of terminals, 1 to 2, 2 to 3, 3 to 4, and 4 to 5, of the test
specimen.
5.5.5
Note any reason(s) for deleting values, i.e., scratches,
condensation, bridged conductors, etc.
5.6 Evaluation
5.6.1
The values to be reported only be the readings
taken in 5.5 through 5.5.5, which are the ‘‘After Recovery’’
values. See Figure 2 for a typical IR plot.
5.6.2
After completion of all electrical testing, the test speci-
mens
be examined for measling, blisters, delamination,
or other forms of degradation, following 24 hour stabilization
at laboratory ambient temperatures.
6 Notes
6.1
Documented alternative cleaning procedures may be
implemented if there is a concern that scrubbing will adversely
affect test results.
6.2
A failure due to measling, blistering, delamination, or any
other form of degradation, may be due to several factors, and
not necessarily due to inferior coatings.
IPC-2632-2
Number
2.6.3.2
Subject
Surface Insulation and Moisture Resistance, Copper Clad
Flexible Dielectric Material
Date
8/14/15
Revision
C
IPC-TM-650
—
shall
shall
Figure
2
Typical
IR
and
MIR
plot
Page
3
of
3
IPC-B-24
IPC-A-600
IPC J-STD-004
IPC-9201
Figure 1 Test Pattern from IPC-B-24
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 4
r
ASSOCIATION
CONNECTING
/
ELECTRONICS
INDUSTRIES
®
221
5
Sanders
Road
Northbrook,
IL
60062-6135
IPC-TM-650
TEST
METHODS
MANUAL
1
Scope
This
test
method
is
to
characterize
fluxes
by
determining
the
degradation
of
electrical
insulation
resistance
of
rigid
printed
wiring
board
specimens
after
exposure
to
the
specified
flux.
This
test
is
carried
out
at
high
humidity
and
heat
conditions.
2
Applicable
Documents
Surface
Insulation
Resistance
Test
Board
Acceptability
of
Printed
Boards
Requirements
for
Soldering
Fluxes
Surface
Insulation
Resistance
Handbook
3
Test
Specimen
A
minimum
of
1
0
ml
of
liquid
flux,
a
rep¬
resentative
container
of
solder
paste,
cored
wire,
paste
flux,
or
extracted
solder
preform
flux.
The
reflow/extraction
process
should
be
carried
out
in
accordance
with
I
PC
J
-STD-004.
3.1
Comb
Patterns
Use
the
IPC-B-24
test
pattern
(see
Figure
1),
which
consists
of
four
comb
patterns
per
coupon.
Each
individual
comb
has
0.4
mm
lines
and
0.5
mm
spacing.
The
metallization
shall
be
un
preserved
bare
copper.
3.2
Laminat
The
laminate
material
for
this
test
shall
be
FR-4
epoxy-glass.
Number
2.6.3.3
Subject
Surface
Insulation
Resistance,
Fluxes
Date
Revision
06/04
B
Originating
Task
Group
Flux
Specifications
Task
Group,
(5-24a)
4
Apparatus
4.1
A
clean
test
chamber
capable
of
programming
and
recording
an
environment
of
25
+10/-2
[77
+
18/-3
°F]
to
at
least
85
±
2
[185
土
3.6
°F]
and
20%
±
5%
to
85%
±
2%
relative
humidity.
A
salt
solution
and
desiccator
may
be
used
to
maintain
humidity
if
a
tight
temperature
control
is
main¬
tained
on
the
chamber.
4.2
A
power
supply
capable
of
producing
a
standing
bias
potential
of
45-50
volts
DC
with
a
tolerance
of
土
10%.
4.3
A
resistance
meter
capable
of
reading
high
resistance
(1012
ohms)
with
a
test
voltage
of
100
volts,
or
an
ammeter
capable
of
reading
1O-10
amps
in
combination
with
100
volts
DC
power
supply.
4.4
Three
2000
ml
beakers.
4.5
Exhaust
ventilation
hood.
4.6
Metal
tongs.
4.7
Soft
bristle
brush.
4.8
Deionized
or
distilled
water
(2
megohm-cm
minimum
resistivity
recommended).
4.9
Drying
oven
capable
of
maintaining
at
least
50
[122
°F]-
5
Procedure
5.1
Test
Conditions
All
fluxes
will
be
tested
at
85
±
2
℃
,
[1
85
±
3.6
°F],
85
±
2%
relative
humidity
for
1
68
hours.
5.2
Specimen
Preparation
There
shall
be
three
test
cou¬
pons
for
each
liquid
flux
to
be
tested
in
the
cleaned
state
(Table
1
,
Sample
Group
A).
When
testing
liquid
fluxes
which
are
intended
to
remain
in
the
uncleaned
state,
six
test
cou¬
pons
are
required.
Three
uncleaned
test
coupons
shall
be
soldered
pattern
side
down
(Table
1
,
Sample
Group
B)
and
three
shall
be
soldered
pattern
side
up
(Table
1,
Sample
Group
C).
Solder
paste
coupons
shall
be
reflowed
pattern
side
up
and
either
cleaned
(Table
1,
Sample
Group
D)
or
not
cleaned
(Table
1
,
Sample
Group
E).