IPC-TM-650 EN 2022 试验方法-- - 第805页
Figure 4 Random Vibration Input IPC-TM-650 Page 5 of 6 Number 3.12 Subject Vibration, Connectors Date 7/75 Revision A 0.06 Power Spectral Density G2/Hz 0.008 /1 ' / > > 3DB/Octave | / | । / , ! ( ； 1 : i ; 1 i…
Figure 3 Vibration Test Curves
IPC-TM-650
Page 4 of 6
.0001
.00005
-
.00001
10
L000
2,000
10.000
VIBRATION
FREQUENCY
(CPS)
Number
3.12
Subject
Vibration,
Connectors
Date
7/75
Revision
A
1
00
^§5^
&mno
£
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NOUVH
-
A
IPC-3-12-3
Figure 4 Random Vibration Input
IPC-TM-650
Page 5 of 6
Number
3.12
Subject
Vibration,
Connectors
Date
7/75
Revision
A
0.06
Power
Spectral
Density
G2/Hz
0.008
/1
'
/
>
>
3DB/Octave
|
/
|
।
/
,
!
(
；
1
:
i
;
1
i
1
1
1
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1
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10
75
2000
Frequency
—
Hz
ipc-3-12-4
5.3.3
Resonant
modes
of
the
test
sample
shall
be
deter¬
mined
by
varying
the
frequency
of
the
applied
sinusoidal
vibra¬
tion
slowly
through
the
frequency
range
from
55
to
2000
Hz
at
an
amplitude
of
less
than
±
2
G
peak.
The
test
sample
shall
be
vibrated
at
a
peak
acceleration
of
±
10G
for
5
minutes
at
each
critical
resonant
frequency
observed
(see
Table
1
,
Note
3).
5.3.4
The
test
sample
shall
be
subjected
to
random
vibration
in
accordance
with
Test
Condition
F,
Table
1
and
Figure
4.
5.3.5
During
the
test
along
each
axis,
the
contacts
shall
be
continuously
monitored
for
discontinuities
in
excess
of
1
microsecond.
6.1
Acceptance
criteria
shall
be
established
in
terms
of
one,
or
any
combination,
of
the
following:
A.
Loss
of
continuity
during
or
after
any
imposed
shock.
B.
Mechanical
damage.
C.
Increase
in
contact
resistance.
D.
Decrease
in
contact
normal
force.
6.2
A
linear
rate
of
change
of
frequency
is
permissible
in
place
of
the
specified
logarithmic
rate
under
the
following
con¬
ditions:
A.
The
frequency
range
above
55
Hz
shall
be
subdivided
into
not
less
than
three
bands.
The
ratio
of
the
maximum
fre¬
quency
to
the
minimum
frequency
in
each
band
shall
not
be
less
than
two.
6.0
Notes
EXAMPLE:
EXAMPLE:
IPC-TM-650
Page 6 of 6
Number
3.12
Subject
Vibration,
Connectors
Date
7/75
Revision
A
B.
The
rate
of
change
of
frequency
(Hz/min.)
shall
be
con¬
stant
for
any
one
band.
C.
The
ratio
of
the
rate
of
change
of
frequency
of
each
band
to
the
maximum
frequency
of
that
band
shall
be
approxi¬
mately
the
same
as
that
ratio
for
every
other
band.
As
an
example
of
the
computation
of
rates
of
change,
assume
that
the
frequency
spectrum
has
been
divided
into
three
bands,
55
to
125
Hz,
125
to
500
Hz,
and
500
to
2000
Hz,
in
accordance
with
6.2A.
Let
the
(constant)
ratio
of
rate
of
frequency
change
in
Hz/min.
to
maximum
frequency
in
Hz
be
k
for
each
band.
Then
the
rates
of
change
for
the
three
bands
will
be
125k,
500k
and
2000k,
respectively.
The
times,
in
minutes,
to
traverse
the
three
frequency
bands
will
therefore
be,
respectively,
125-55
500-125
and
2000-500
125k
500k
2000k
If
the
range
traverse
time
is
30
minutes
-
AC
二
70
375
+
1500
刃
二
125k
+
500k
-
2000k
from
which:
k
=
0.0687
The
required
maximum
constant
rates
of
frequency
change
for
the
three
bands
are
therefore
8.55,
34.2
and
137
Hz/min.,
respectively,
and
the
times
of
traverse
of
the
bands
are
8.2,
10.9
and
10.9
minutes,
respectively.