IPC-TM-650 EN 2022 试验方法--.pdf - 第461页
Figure 3 Three View D rawing of a Steel Clamping Bar (See 5.1.1) Cut to Length for the 50.8 mm L V alue (Extended #4-40 Threaded Rod Both Ends is Not Shown) Figure 4 Three View D rawing of a Copper G round Plate (See 5.1…
Figure 2 Schematic Drawings of Instrumentation
Setups Suitable for Measurements of Permittivity
IPC-TM-650
Page 3 of 11
Number
2.5.5.5.1
Subject
Stripline
Test
for
Complex
Relative
Permittivity
of
Circuit
Board
Materials
to
14
GHz
Date
3/98
Revision
COMPUTER
WITH
GPIB
(IEEE
438)
INTERFACE
SOURCE
SYNCHRONIZER
AUTOMATIC
COUNTER
SWEEPER
WITH
RF
PLUG-IN
POWER
METER
POWER
SPUTTER
A.
Automated
test
setup
B.
Simplified
automated
test
setup
C.
Network
analyzer
setup
I
PC-1
25551-1
•
10
dB
Attenuator
HP8491
B
•
Programmable
Power
Meter
HP436A
•
Power
Sensor
HP8484A
with
70
to
10
dBm
range
•
IEEE
488
(GPIB)
cables
•
Controlling
computer
with
GPIB
interface
The
above
equipment
is
connected
as
explained
in
4.1
.1
.1
through
4.1
.1
.3,
and
as
illustrated
in
Figure
2,
Type
A.
4.
1.1.1
RF
Connections
The
power
splitter
connects
directly
to
the
RF
plug-in
output.
One
output
of
the
splitter
connects
by
RF
cable
to
the
counter
input.
The
other
output
is
connected
by
RF
cable
to
the
attenuator
which
connects
to
one
of
the
test
fixture
probe
lines.
4.1
.1
.2
Control
Connections
Connections
between
counter
and
synchronizer
are
provided
as
specified
by
the
manufacturer.
The
FM
output
from
the
synchronizer
connects
by
BNC
to
the
FM
input
on
the
sweeper.
GPIB
cables
connect
in
parallel
to
the
sweeper,
synchronizer,
power
meter,
and
computer
interface.
4.
1.1.3
Other
Connections
The
power
sensor
is
con¬
nected
to
the
other
probe
of
the
fixture,
and
its
special
cable
connects
into
the
power
meter.
4.1.2
The
microwave
signal
source
must
be
capable
of
pro¬
viding
an
accurate
signal.
During
the
required
time
period
and
range
of
frequency
needed
to
make
a
permittivity
and
loss
tangent
measurement,
the
source
must
provide
a
leveled
power
output
that
falls
within
a
0.1
dB
range.
When
the
source
is
set
for
a
particular
frequency,
the
output
must
be
capable
of
remaining
within
5
MHz
of
the
set
value
for
the
time
required
to
make
a
measurement.
The
means
for
measuring
frequency
shall
have
a
resolution
of
0.05%
or
less
and
an
accuracy
of
0.08%
or
less.
An
error
of
+8
MHz
in
measurement
of
a
resonant
frequency
near
1
0
GHz
for
a
material
with
nominal
permittivity
of
2.50
represents
a
-0.004
error
in
permittivity.
The
means
for
detecting
the
power
level
shall
have
a
resolu¬
tion
of
0.1
dB
or
less
and
be
capable
of
comparing
power
levels
within
a
3
dB
range
with
an
accuracy
of
0.1
dB.
An
error
of
0.1
dB
in
estimating
half
power
frequency
points
can
result
in
an
error
in
the
loss
tangent
of
about
0.0001
for
a
material
with
2.5
permittivity.
See
equation
5
in
7.2.
4.1.3
A
synthesized
CW
generator
can
be
used
to
replace
the
sweeper,
plug-in,
power
splitter,
connector,
and
source
synchronizer
for
the
simpler
set-up
shown
in
Figure
2,
Type
B.
4.2
Automated
Network
Analyzer
for
the
Test
Setup
The
instrumentation
described
in
4.1
may
be
replaced
with
either
a
scalar
or
vector
network
analyzer,
with
test
cables
connected
to
the
test
fixture
of
5.0
as
the
device
under
test
(DUT),
as
shown
in
Figure
2,
Type
A.
Examples
of
automated
network
analyzers
known
to
be
suitable
include
the
Hewlett-
Packard
8510
vector
network
analyzer
or
the
Wiltron
Model
561
scalar
network
analyzer.
These
or
equivalent
may
be
used.
Figure 3 Three View Drawing of a Steel Clamping Bar
(See 5.1.1) Cut to Length for the 50.8 mm L Value
(Extended #4-40 Threaded Rod Both Ends is Not Shown)
Figure 4 Three View Drawing of a Copper Ground Plate
(See 5.1.2) for the 50.8 mm L Value
IPC-TM-650
Page 4 of 11
Number
2.5.5.5.1
Revision
Subject
Stripline
Test
for
Complex
Relative
Permittivity
of
Circuit
Board
Materials
to
14
GHz
Date
3/98
Such
instruments
may
be
operated
either
manually
or
under
computer
control
with
suitable
programming
to
locate
the
resonant
frequency
and
the
frequencies
above
and
below
resonance
where
transmitted
power
is
3
dB
below
that
at
resonance.
Network
analyzers
have
several
advantages
over
the
instrumentation
described
in
4.1.
Data
collection
is
rapid
and
may
be
continuously
refreshed
with
averaging.
The
log
magnitude
response
curve
for
ratio
of
transmitted
to
incident
power
(the
S21
parameter)
as
dB
versus
frequency
is
visible
on
a
screen
for
easy
verification
of
a
valid
resonance.
A
large
number
of
dB,
frequency
data
points
near
the
resonance,
are
readily
available
for
optional
use
of
non-linear
regression
analysis
techniques
to
determine
the
frequency
and
Q
values
with
statistically
better
degrees
of
uncertainty
than
those
attainable
by
the
three
point
(fr,
and
f2)
method
in
either
section
6.2
or
6.3.
5.0
Test
Fixture
5.1
Fixture
Parts
for
Clamping
L
is
the
selected
length
for
the
specimen.
A
fixture
may
include
hardware
for
more
than
one
value
of
L.
Suggested
L
values
are
50.8,
76.2,
152.4,
and
304.8
mm.
Since
the
fundamental
resonant
frequency
and
its
harmonics
are
inversely
proportional
to
the
value
of
L
for
a
given
£r,
the
selection
of
an
L
value
determines
the
low
fre¬
quency
at
which
the
material
may
be
measured
for
and
tan
8.
Figure
1
shows
the
end
views
of
a
series
of
specimen
con¬
figurations
and
includes
the
parts
for
clamping.
5.1.1
For
each
L
value,
two
ground
tool
steel
clamping
bars
25.4
mm
x
28.58
mm
x
(L-6.35),
as
shown
in
Figure
3.
These
are
intended
to
provide
uniformly
distributed
force
along
the
length
of
the
specimen,
transferred
through
part
5.1
.2.
A
rec¬
ommended
practice
is
to
provide
these
with
a
small
diameter
threaded
rod,
such
as
#4-40,
centered
on
each
end
and
extending
about
20
mm
to
serve
as
a
means
for
attaching
the
probe
assembly
of
5.2
used
in
6.1.5
or
the
alignment
jig
of
5.1
.3
used
in
6.1
.1
.
5.1.2
For
each
L
value,
two
pure
copper
ground
plates
25.4
mm
x
9.52
mm
x
L
with
all
edges
sharp
as
in
Figure
4.
These
provide
at
the
ends
a
copper
surface
perpendicular
to
the
specimen
length
direction,
which
serves
as
a
contact
area
over
a
range
of
specimen
thicknesses
for
making
ground
con¬
tinuity
to
the
coaxial
probe.
When
these
are
clamped
with
5.1
.1
as
described
in
6.1
.1
,
the
inside
corners
at
each
end
between
the
outer
face
of
5.1
.2
and
the
end
surface
of
5.1
.1
form
reference
locations
equidistant
from
the
center
line
of
the
stripline
resonator
element
that
are
used
by
the
probe
assem¬
bly
5.2
to
align
the
coaxial
probe
with
that
center
line.
IPC-25551-3
Drill
#43
(2.26
mm)
L
—
6.35
mm
L
LEAVE
ALL
EDGES
SHARP
5.1.3
A
stacking
alignment
jig
as
used
in
6.1
.1
of
an
appro¬
priate
design.
Figure
5
shows
a
suggested
design.
5.1.4
A
low
profile
mechanical
force
gage
with
4.45
kN
compression
capacity
such
as
a
Dillon
Model
U,
PN
30482-
0053,
available
from
Dillon
Quality
Plus,
Inc.,
11
40-T
Avenida
Acaso,
Camarillo,
GA
993012.
One
is
needed
for
each
of
part
5.1.5.
5.1.5
A
clamping
arrangement
with
5.1.4
properly
mounted
in
the
line
of
force
and
with
alignment
parts
for
assuring
the
line
of
force
is
properly
located
through
the
stack
assembled
Figure 5 Five Assembly Views for a Suggested Two Member Stacking Alignment Jig (See 5.1.3)
Note:
IPC-TM-650
Page 5 of 11
Number
2.5.5.5.1
Revision
Subject
Stripline
Test
for
Complex
Relative
Permittivity
of
Circuit
Board
Materials
to
14
GHz
Date
3/98
VIEW
FROM
BACK
VIEW
OF
FACE
TOWARD
CLAMP
BLOCKS
厂
#5-40
FH
SCREW,
4
PLACES
FRONT
CLAMP
BLOCKS
IPC-25551-5
Only
the
right-handed
member
is
shown.
Part
A
with
3.175
mm
deep
recessed
area
on
the
face
towards
the
clamp
blocks
assures
6.1
.1
items
b,
c,
and
d.
Its
notched
out
area
allows
6.1
.1
item
5.
Part
B
assures
6.1
.1
,
item
a.
Part
C
eases
mounting
the
jig
member
to
the
end
of
the
lower
steel
bar
(see
5.1
.1).
Knurled
#4-40
nut
D,
retained
by
E,
fastens
A
against
the
steel
bar
with
its
extended
threaded
rod.
Part
F
assists
in
meeting
6.1
.1
,
item
e.
according
to
6.1.2.
This
can
be
a
manually
adjustable
mechanical
screw
fixture
such
as
a
vise,
clamp,
or
a
pneu¬
matic
cylinder
fixture
with
a
pressure
regulator.
One
of
com¬
ponent
5.1
.5
with
5.1
.4
is
needed
for
every
152
mm
of
speci¬
men
length
L.
See
Figure
6.
5.2
Probe
Assembly
Two
probe
assemblies
are
needed;
one
for
each
end
of
the
clamped
stack.
They
can
be
designed
to
be
attached
to
the
ends
of
the
clamp
bars
5.1.1.
The
fol¬
lowing
items
are
needed
for
each
assembly.
5.2.1
Semi
rigid
coaxial
cable
1.8
mm
size
about
230
mm
long
with
3
mm
connector
and
adapters
to
the
electronic
instrumentation.
The
probe
end
of
the
cable
has
the
center
conductor
extending
1.8
mm.
5.2.2
Copper
fitting
with
reversed
bevel
soldered
to
the
end
of
the
coaxial
cable
jacket,
as
shown
in
Figure
7.
5.2.3
A
means
for
effecting
ground
contact
between
5.2.2
and
both
of
5.1
.2.
Figure
8
shows
a
suggested
beryllium¬
copper
alloy
wire
part.
Two
are
required,
as
shown
in
the
sec¬
tional
views
of
Figure
9.
5.2.4
Mechanical
assembly
capable
of
attaching
to
the
ends
of
5.1
.1
and
using
the
locations
of
the
inside
corners
of
5.1
.1
and
5.1.2
to
align
parts
5.2.1
through
5.2.3
with
the
center
line
of
the
stripline
resonator.
It
must
accommodate
various
specimen
thicknesses,
provide
alignment
of
5.2.1
through
5.2.3,
make
contact
pressure
of
5.2.3
to
5.1.2,
provide
con¬
trolled
adjustment
of
the
gap
between
specimen
end
and
5.2.1
,
and
provide
support
for
the
coaxial
cable
connector
to
the
instrumentation.
A
wide
variety
of
hardware
designs
for
accomplishing
the
alignment
required
in
6.1.5
are
acceptable
if
the
following
con¬
ditions
are
met
for
each
of
the
two
probes: