IPC-TM-650 EN 2022 试验方法-- - 第451页

Figure 11 Aluminum Block for T emperature Control and Tr ansfer o f Pressure to th e Clamp P lates, Fitted with T apped Holes for Slide, Embedded Steel Ball, a nd T apped for T ubin g Fittings for Circulating Fluid IPC-T…

100%1 / 824
Figure 10 Slider and Block for Connecting Pressure Block and Base Plate with Allowance for Opening the Fixture
IPC-TM-650
Page 18 of 25
IPC-2555-10
When
the
slider
is
placed
inside
the
block
and
fastened
to
the
bottom
of
the
clamp
block,
it
should
allow
total
movement
of
0.25
mm
vertically,
0.5
mm
sideways
and
2.5
mm
along
the
slider
length.
Number
2.5.5.5
Subject
Stripline
Test
for
Permittivity
and
Loss
Tangent
(Dielectric
Constant
and
Dissipation
Factor)
at
X-Band
Date
3/98
Revision
C
Figure 11 Aluminum Block for Temperature Control and Transfer of Pressure to the Clamp Plates, Fitted with Tapped
Holes for Slide, Embedded Steel Ball, and Tapped for Tubing Fittings for Circulating Fluid
IPC-TM-650
Page 19 of 25
5.5.4 Calculating Average Insertion Loss Slope m
a
and
Intercept b
a
For ‘‘N’’ points between frequency range f1 to
f2 the average insertion loss slope and intercept are defined
as follows in Equations 5-15 to 5-18.
,
avg
=
1
N
Σ
n
,
n
[5-15]
IL
avg
=
1
N
Σ
n
IL(,
n
)
[5-16]
m
A
=
1
N
Σ
n
(,
n
− ,
avg
) ⋅ (IL(,
n
) − IL
avg
)
Σ
(,
n
− ,
avg
)
2
[5-17]
b
A
= IL
avg
− m
A
⋅ ,
avg
[5-18]
Suggested values of f1 and f2 are 1 GHz and 5 GHz respec-
tively.
The slope m
a
is a measure of the total frequency dependent
attenuation, α, which is described in IPC-2141.
Number
2.5.5.12
Subject
Test Methods to Determine the Amount of Signal Loss on
Printed Boards
Date
07/12
Revision
A
IPC-TM-650
Page
24
of
24