IPC-TM-650 EN 2022 试验方法--.pdf - 第566页
IPC-TM-650 Number S ubject Date Revision Page 7 of 7 2.5.5.15 RelativePermittivityandLossTangentUsinga 06/22 Split-PostDielectricResonator N/A 5.3.10 If another t est freq uency is selected, change th…
IPC-TM-650
Number Subject Date
Revision
2.5.5.15
RelativePermittivityandLossTangentUsinga
06/22
Split-PostDielectricResonator
N/A
Page 6 of 7
5.3.3
Adjust the test temperature of the test chamber. After reaching the set temperature (T), hold it for at least 15 minutes.
Measure resonance frequency
f
0
(T) and Q-factor Q
0
(T) of the empty resonator.
Note:
The resonance peak should be between -40 dB and -45 dB. Adjust the position of the coupling loops to achieve this
range ensuring their position is symmetrical. When measuring the Q-factor, the frequency span of the VNA shall be adjusted
such that it is between 110 % and 200 % of the full width at half maximum of the resonant curve.
5.3.4
Utilize a micrometer to measure the thickness of the specimen, record as h. The environmental test chamber shall be
returned to room temperature. Insert the specimen into the test fixture. The side with marking is face up and the edge of this
side has to be aligned with the fixture edge.
5.3.5
Repeat step 5.3.3. Measure the resonance frequency
f
s
(T) and Q-factor Qs(T) of the resonator with the specimen at
temperature T.
Note:
When measuring the Q-factor, the frequency span of the VNA should be adjusted such that it is between 110 % and 200
% of the full width at half maximum of the resonant curve.
5.3.6
Calculate following the instructions in step 5.2.7, the value of the relative permittivity Dk(T) and the loss tangent Df(T)
at temperature T.
5.3.7
If another test temperature is required, repeat steps 5.3.2 through 5.3.6 at the new temperature.
5.3.8
Thermal coefficient of relative permittivity
e
r
(short for TC
e
r
) is the change rate of relative permittivity per temperature
change. The unit of TC
e
r
is 10
-6
/°C. Generally, the relative permittivity of a specimen at its base temperature T
ref
of 23 °C
(is used as the base relative permittivity Dk(T
ref
). For temperature T, TC
e
r
shall be calculated according to Equation (3).
X 10
6
(3)
where
TC
e
r
is thermal coefficient of
e
r
, 10-
6
/°C;
T is test temperature, °C;
T
ref
is base temperature, °C;
Dk(T) is relative permittivity at temperature T;
Dk(T
ref
) is relative permittivity at temperature T
ref
.
5.3.9
The thermal coefficient of tan
d
(TC tan
d
) is the change in rate of loss tangent per temperature (every increase or decrease
1°C [1.8°F]. The unit of TC tan
d
is 10
-6
/°C. Generally, the loss tangent of specimen at base temperature T
ref
of 23 °C [73.4 °F]
is used as the base loss tangent Df(T
ref
). For temperature T, TC tan
d
is calculated according to the Equation (4).
X 10
6
(3)
where
TC tan
d
is thermal coefficient of tan
d
, ppm/°C;
T is the test temperature, °C;
T
ref
is base temperature, °C;
Df(T) is loss tangent at temperature T;
Df(T
ref
) is loss tangent at temperature T
ref
.
―
Dkg-
Dkg
3
飞-力
x
Dkg
(
T-T]xDf(Tf
IPC-TM-650
Number Subject Date
Revision
Page 7 of 7
2.5.5.15
RelativePermittivityandLossTangentUsinga
06/22
Split-PostDielectricResonator
N/A
5.3.10
If another test frequency is selected, change the SPDR test fixture in accordance with the test frequency. Then repeat
steps 5.3.2 through 5.3.9.
6 Report
6.1
For room temperature tests, report the following:
6.1.1
Test environment (temperature, humidity);
6.1.2
Test frequency;
6.1.3
Report the values and the average values of the relative permittivity and loss tangent at test frequency;
6.1.4
The preconditioning of the specimen;
6.1.5
Any anomalies in the test or variations from this test method.
6.2
For variable temperature tests, report the following:
6.2.1
Test temperature (T) and base temperature (T
ref
);
6.2.2
Test frequency;
6.2.3
Dk(T)and Df(T)at test temperature (T);
6.2.4
TC
e
r
and TC tan
d
;
6.2.5
Dk(T
ref
) and Df(T
ref
);
6.2.6
If more than one test temperature is necessary, report the curve diagram of the relative permittivity and loss tangent in
accordance with the temperature variation ;
6.2.7
The preconditioning of the specimen;
6.2.8
Any anomalies in the test or variations from this test method.
7 Notes
7.1
Accuracy of measurements of a sample of thickness h.
7.2
Permittivitymeasurement:Δ
e
/
e
=±[0.0015+Δh/h].
7.3
Losstangent:Δtan
d
= ±2 × 10
−5
or ±0.03 × tan
d
whichever is higher.
7.4
Clean test heads, standard materials and fixtures regularly.
7.5
To prevent damage to the test fixture because of the variable temperature tests, verify the test system regularly with a
standard reference sample. For example, single-crystal quartz is used as standard reference sample of thickness 0.4 mm.
The deviation of the relative permittivity measurement between the test result and the nominal value of the standard
reference sample shall be less than ± 0.7 %, while the deviation of the loss tangent shall be less than ± 2 × 10
−5
.
―
ASTM D229
ASTM D149
The Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062
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 3
IPC-TM-650
TEST
METHODS
MANUAL
Number
2.5.6
Subject
Dielectric
Breakdown
of
Rigid
Printed
Wiring
Material
Date
Revision
5/86
B
Originating
Task
Group
N/A
1
.0
Scope
This
method
describes
a
procedure
for
deter¬
mining
the
ability
of
rigid
insulating
materials
to
resist
break¬
down
parallel
to
laminations
(or
in
the
plane
of
the
material)
when
subjected
to
extremely
high
voltages
at
standard
AC
power
frequencies
of
50-60Hz.
As
for
most
electrical
properties,
values
obtained
on
most
materials
are
highly
dependent
on
the
moisture
content
and
tests
using
different
conditioning
cannot
be
compared.
Tests
in
other
mediums,
e.g.,
air
are
generally
impractical
due
to
its
relatively
low
breakdown.
This
method
is
based
on
the
test
technique
described
as
ASTM
D229.
2
.0
Applicable
documents
Standard
Method
of
Testing
Rigid
Sheet
and
Plate
Materials
Used
for
Electrical
Insulation
Standard
Test
Method
for
Dielectric
Breakdown
Voltage
and
Dielectric
Strength
of
Solid
Electrical
Insulating
Materials
at
Commercial
Power
Frequencies
3
.0
Test
Specimens
3.1
Number
Four
specimens
shall
be
tested.
When
speci¬
fied,
two
shall
be
in
the
machine
direction
and
two
in
the
transverse
direction
for
reinforced
materials.
3.2
Form
Specimens
shall
be
approximately
3.0
inch
X
2.0
inch
X
thickness
and
shall
be
prepared
by
shearing
or
sawing
the
specimen
from
the
test
sample.
Two
holes
0.188
inch
in
diameter
are
to
be
drilled
along
the
center
line
of
the
3.0
inch
dimension
and
midway
between
the
edges
in
the
2.0
inch
dimension,
with
a
spacing
of
1
.0
inch
±
.01
inch
center
to
center.
3.3
Location
The
specimens
may
be
cut
from
any
location
in
the
sheet
(except
from
the
outer
1.0
inch
of
full
size
sheets).
3.4
Foil
Clad
Material
Foil
clad
material
shall
have
all
metal
cladding
removed
by
etching
and
shall
be
thoroughly
cleaned
prior
to
conditioning
or
testing.
4.0
Apparatus/Materials
4.1
High
voltage
breakdown
tester
(generally
50KV
mini¬
mum)
with
current
rating
of
.5KVA
up
to
10KV
and
5
KVA
above
1
0KV
and
a
motorized
control
capable
of
a
500
volts/
second
rate
of
rise.
4.2
Oil
tank
filled
with
insulating
oil1
capable
of
exceeding
the
requirements
of
the
specification.
4.3
Tapered
pin
electrode
fixture
utilizing
two
American
Standard
#3
pins.
(Note
spherical
ends
on
the
pins
are
per¬
mitted
and
recommended
to
reduce
likelihood
of
breakdown
in
the
oil.)
4.4
High
voltage
test
leads
(leads
rated
in
excess
of
machine
capacity
are
recommended).
4.5
Constant
temperature
water
bath,
capable
of
50℃
±
2
℃,
filled
with
distilled
water.
4.6
Beaker
or
pan
filled
with
ambient
temperature
distilled
water.
4.7
Racks
for
supporting
specimens
in
the
50℃
water
bath
(with
all
specimen
surfaces
exposed).
4.8
Timer
0-60
seconds.
4.9
Lint
free
paper
towels.
5.0
Procedure
5.1
Preconditioning
Unless
otherwise
specified
the
speci¬
men
shall
be
conditioned
for
48
hours
(+2
hours
-0
hours)
in
distilled
water
maintained
at
50℃
±
2
℃.
Following
this
step
the
specimen
shall
be
immersed
in
ambi¬
ent
temperature
distilled
water
for
30
minutes
minimum,
4
hours
maximum,
to
allow
the
specimens
to
achieve
tempera¬
ture
equilibrium
without
a
substantial
change
in
moisture
con¬
tent.
1
.
Insulating
Oil:
Transfer
oil
such
as
Shell
Dial
Ax
may
be
used.
Use
of
dibutyl
phthalate
is
acceptable
but
it
may
cause
failure
of
the
adhesives
used
for
plastic
tanks.