IPC-TM-650 EN 2022 试验方法.pdf - 第804页

IPC-3-12-3 Figure 3 V ibration T est Curves IPC-TM-650 Number 3.12 Subject Vibration, Connectors Date 7/75 Revision A P a g e4o f6

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Table 1 and Figure 3 or 4 as specified in the individual con-
nector specification; if no test is specified, Test Condition D
shall apply.
5.1.2 The fixtured test sample or a suitable dummy load
shall be mounted on the vibration exciter during the calibration
procedure. Any dummy load shall have the mass and center
of gravity as that of the test sample and shall be fixtured in a
similar manner (a reject connector provides an ideal dummy
load).
5.1.3 The control transducer shall be mounted on the test
fixture immediately adjacent to the test specimen or dummy
load. The displacement-acceleration curve of the sinusoidal
input or the equalized random input shall fall within, the speci-
fied tolerances.
5.2 Sinusoidal Vibration Test
5.2.1
The dummy load shall be replaced with the actual test
sample.
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 the sinusoidal
test condition specified in the individual connector specifica-
tion; the following details shall apply:
A. Amplitude — The test sample shall be subject to simple
harmonic motion at an amplitude of 0.06 inch double
amplitude (peak-to-peak displacement) or the maximum
acceleration specified in Table 1, whichever is less.
B. Frequency Range — The vibration frequency shall be var-
ied logarithmically between the approximate limits speci-
fied in Table 1; see 6.2 for alternate method.
C. Range Traverse Time and Duration — The entire fre-
quency range shall be traversed in a time as specified in
Table 1. The traverse (in either direction) shall be per-
formed the indicated number of times along each of three
(3) orthogonal axes for at least the indicated total vibration
period per axis. If the procedure of Test Condition A is
used for the 10 to 55Hz band of Test Conditions B, C or
E, the duration of this portion shall be the same as the
duration for this band using logarithmic cycling at the rate
specified for Test Conditions B, C or E (approximately
1-1/3 hours along each of 3 orthogonal axes).
5.3 Random Vibration Test
5.3.1
The dummy load shall be replaced with the actual test
sample.
5.3.2 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.
Table 1 Test Conditions
Test
Condition
Peak Acceleration
(Gravity Units)
Frequency
Range
Approx. Traverse
Time
1
Traverses
Per Axis
Duration
Per Axis
A 10 5 to 55 Hz 0.5 min. 240 2 hrs.
B 10 10 to 500 Hz 7.5 min. 24 3 hrs
C 15 10 to 2000 Hz 10 min. 24 4 hrs.
D
2/3
10 55 to 2000 Hz 40 min. 1 40 min.
E 20 10 to 2000 Hz 10 min. 24 4 hrs.
F 10.9
4
10 to 2000 Hz N/A N/A 15 min.
1
Traverse time is that time to go from the lower frequency to the higher frequency, or vice versa.
2
Test Condition D shall be preceded by vibration tests per Test Condition A.
3
Test Condition D is intended to isolate resonant frequencies. If resonance is detected, the test sample shall be vibrated at each critical resonant frequency
for 5 minutes; critical resonance is defined as a point on the test sample observed to have a maximum amplitude (or acceleration) more than twice that of
the controlled input.
4
Overall root-mean-square (RMS) acceleration.
IPC-TM-650
Number
3.12
Subject
Vibration, Connectors
Date
7/75
Revision
A
Page3of6
IPC-3-12-3
Figure 3 Vibration Test Curves
IPC-TM-650
Number
3.12
Subject
Vibration, Connectors
Date
7/75
Revision
A
Page4of6
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±2Gpeak. 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.
6.0 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.
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.
IPC-3-12-4
Figure 4 Random Vibration Input
IPC-TM-650
Number
3.12
Subject
Vibration, Connectors
Date
7/75
Revision
A
Page5of6