IPC-TM-650 EN 2022 试验方法--.pdf - 第793页
NOTE: Figure 3 T ol eran ces for Half Sine Shock Pu lse IPC-TM-650 Page 4 of 5 Number 3.8 Subject Mechanical Shock, Connectors Date 7/75 Revision A 5.2.2 The test sample shall be connected to the discontinu¬ ity monitor …
NOTE:
Figure 2 Parallel Connector Fixture (Suggested)
Table I
Test Conditions
Test
Condition
Peak
Acceleration
A-Gravity
Units
Nominal
Duration
D-Milli-
seconds Waveform
Velocity
Change
Vi
(G-MS)
IPC-TM-650
Page 3 of 5
Number
3.8
Subject
Mechanical
Shock,
Connectors
Date
7/75
Revision
A
FIXTURE
MAY
BE
A
MULTIPLE
TYPE
IPC-3-8-2
A
50
11
Half-sine
350.30
B
75
6
Half-sine
286.62
C
100
6
Half-sine
382.16
D
500
11
Half-sine
318.47
E
1000
0.51
Half-sine
318.47
F
5000
0.51
Half-sine
477.70
G
50
10
Sawtooth
250.00
H
75
6
Sawtooth
225.00
I
100
6
Sawtooth
300.00
velocity-change
associated
with
the
measured
acceleration
pulse
is
V.
5.1.3
The
monitoring
transducer
shall
be
mounted
on
the
test
fixture
immediately
adjacent
to
the
test
specimen
or
dummy
load.
Two
consecutive
shock
applications
to
the
cali¬
bration
load
shall
produce
acceleration
waveforms
that
fall
within
the
appropriate
tolerance
envelope;
in
addition,
graphi¬
cal
integration
of
each
recorded
pulse
shall
indicate
a
velocity
change
within
10%
of
the
value
specified
in
Table
1
.
5.2
Test
5.2.1
The
dummy
load
shall
be
replaced
with
the
actual
test
sample.
If
all
conditions,
other
than
this
substitution,
remain
the
same,
the
resulting
test
waveform
shall
be
considered
satisfactory
even
though
it
may
not
conform
to
Figures
3
or
4,
as
appropriate.
NOTE:
Figure 3 Tolerances for Half Sine Shock Pulse
IPC-TM-650
Page 4 of 5
Number
3.8
Subject
Mechanical
Shock,
Connectors
Date
7/75
Revision
A
5.2.2
The
test
sample
shall
be
connected
to
the
discontinu¬
ity
monitor
and
a
minimum
current
of
100
milliamperes
shall
be
established
in
the
series
circuit
comprising
all
contacts
of
the
test
sample.
5.2.3
The
test
sample
shall
be
subjected
to
three
(3)
shocks
in
each
direction
along
each
of
three
(3)
orthogonal
axes
(18
shocks
total).
During
and
after
the
application
of
each
shock,
the
contacts
shall
be
monitored
for
discontinuities
in
excess
of
1
microsecond.
The
oscillogram
should
include
a
time
about
3D
long
with
the
pulse
approximately
in
the
center.
The
integration
to
determine
the
velocity
change
should
extend
from
0.4D
before
the
pulse
to
0.1D
beyond
the
pulse.
The
peak
accel¬
eration,
magnitude
of
the
sawtooth
pulse
is
P
and
its
duration
is
D.
Any
measured
acceleration
pulse
which
can
be
contained
between
the
broken
line
boundaries
is
nominal
terminal-peak
sawtooth
pulse
of
nominal
peak
value,
P,
and
nominal
dura¬
tion,
D.
The
velocity-change
associated
with
the
measured
acceleration
pulse
is
V.
6.0
Notes
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,
Figure 4 Tolerances for Terminal-Peak Sawtooth Shock Pulse
Figure 5 Tolerance Limits for Measuring System Frequency Response
IPC-TM-650
Page 5 of 5
SYSTEM
INCLUDING
TRANSDUCER
Number
3.8
Subject
Mechanical
Shock,
Connectors
Date
7/75
Revision
A
IPC-3-8-4
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FREQUENCY
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IPC-3-8-5