IPC-TM-650 EN 2022 试验方法.pdf - 第586页
1 Scope This test method determines electrical resistance of multilayer PWBs. 2 Applicable Documents None 3 Test Specimen 3.1 Test coupon ‘‘G’’ 4 Equipment/Apparatus 4.1 A four-terminal Kelvin Bridge or equivalent 5 Proc…
4
Apparatus
4.1
DC
power supply capable of providing voltage in the
range of 10 V to 100 V, with an accuracy of at least ± 10%,
and capable of supplying current in the range of 0 mA to 1 mA
at those voltage levels
4.2
DC
ammeter capable of measuring current in the range
of 0 to 1 mA, with an accuracy of ± 0.001 mA
4.3
Stopwatch
or other timing mechanism capable of
resolving ± 1 second
4.4
Hot-bar
bonds capable of producing ACF bonds
between flex circuits and flat panel displays, and outfitted with
a thermode of appropriate length and width for a given appli-
cation (Thermode width is generally in the range of 2 mm to 3
mm, and length is in the range of 25 mm to 50 mm.)
5
Procedure
5.1
Calculate
the insulation resistivity (pi) in Ohm-cm for
each of three samples. Each sample must meet the specifica-
tion requirement (see Figure 4).
pi =
(A)(B)(C)(D)(E)
(F)(G)(H)
=Ω−cm
where:
A
= voltage
B = number of bonds
C = width of bond (mm)
D = conductor thickness (mm)
E = total number of lines - 1
F = mm to µm conversion
G = current amps
H = trace to trace gap (mm)
Example A test circuit is designed with 100 total circuit
traces (50 anodic and 50 cathodic) on 100 µm pitch. The
trace thickness is 0.035 mm (1 oz Cu) and the trace to trace
gap is 0.05 mm. Suppose also that four ACF bonds are pre-
pared, with each bond being 3 mm wide. After applying a 50
VDC bias for 10 seconds, a leakage current of 0.5 mA is
measured.
pi =
(50)(4)(3)(0.035)(99)
(10)(0.0005)(0.050)
= 8.3E6 Ω−cm
IPC-2-5-10-1-3
Figure
3 Flex Circuit Containing Four ACF Bond Sites,
After Being Bonded to a Glass Slide
IPC-2-5-10-1-4
Figure
4 Schematic Diagram for Insulation Resistivity
Measurement
IPC-TM-650
Number
2.5.10.1
Subject
Insulation
Resistivity for Adhesive Interconnection Bonds
Date
11/98
Revision
P
age2of2
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1
Scope
This
test method determines electrical resistance
of multilayer PWBs.
2
Applicable Documents
None
3
Test Specimen
3.1
Test
coupon ‘‘G’’
4
Equipment/Apparatus
4.1
A
four-terminal Kelvin Bridge or equivalent
5
Procedure
5.1 Test
5.1.1
Measure
the resistance between any two adjacent
holes in row A or E of Specimen G, except holes A5 & 6, E3,
4, 11, and 12 (see Figure 1).
5.1.2
Solder
leads in the selected holes for proper connec-
tion to the four terminals of the test instrument according to
diagram A.
5.1.3 Repeat
this test for each of the five pairs of holes.
5.2
Evaluation
Record
and report all electrical resistance
values.
IPC-2-5-12-1
Figure
1 Distance from Clips
The
Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062
IPC-TM-650
TEST
METHODS MANUAL
Number
2.5.12
Subject
Interconnection
Resistance, Multilayer Printed
Wiring
Date
4/73
Revision
Originating Task Group
N/A
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.
P
age1of1
电子技术应用 ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ
1
Scope
This
test method is used to determine the resistiv-
ity of copper foil.
2
Applicable Documents
ASTM-B-193
Resistivity
of Conductive Materials
3
Test Specimen
3.1
Three
samples should be selected at equal distances
across the width of the material from each lot and the width
and gauge length measured to the nearest 0.025 mm.
4
Equipment/Apparatus
4.1 Tester
The
resistance of the samples shall be mea-
sured with instruments of suitable sensitivity (see ASTM-B-
193).
5
Procedure
5.1 Test
5.1.1 Resistance Determination
Three
samples shall be
selected at equal distances across the width of the material
from each lot and the width and gauge length measured to
the nearest 0.025 mm. The resistance of the samples shall be
measured with instruments of suitable sensitivity, in accor-
dance with ASTM-B-193.
5.1.2
For
convenience, the distance between test points
may be 15 cm, and the weight of the 2.5 cm wide sample
being measured is determined by weighing a 2.5 cm x 15 cm
strip from the test specimen.
5.2
Evaluation
5.2.1
Calculate the resistance using the formula:
R
T
=
R
t
1 +αT (t − T)
where:
T
= reference temperature (20°C)
t = temperature at which measurement is made (°C)
αT = temperature coefficient of resistance (0.00388)
R
T
=
resistance at reference temperature (20°C)
R
t
=
measured resistance
5.2.2
Calculate
weight resistivity in ohms - gram/meter
2
using
the formula:
P
w
=
W
L
1
L
2
R
T
where:
W
= weight of test specimen (grams)
L
1
=
gauge length (meters)
L
2
=
length of test specimen (meters)
R
T
=
resistance at reference temperature (20°C)
Note: If the procedure described in 5.1.2 is used, then:
L
1
L
2
Therefore
is (0.1524 meters)
2
or:
P
W
=
weight
of 0.040 mm x 0.235 mm specimen
0.02323
R
T
The
Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062
IPC-TM-650
TEST
METHODS MANUAL
Number
2.5.13
Subject
Resistance
of Copper Foil
Date
3/76
Revision
A
Originating Task Group
N/A
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.
P
age1of1
电子技术应用 ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ