IPC-TM-650 EN 2022 试验方法.pdf - 第801页

1.0 Scope 1.1 To determine the effect on the connector of the stresses produced by mechanical vibration within the predominant fre- quency ranges and of amplitudes that may be encountered during field service; two input …

6.3 Thermal equilibrium shall be assumed to have been

attained when three successive temperature readings taken at

five-minute intervals show a variation not greater than 3°C.

6.4 The exposure and transfer times specified in Table 1 are

based on an assumed sample weight less than 0.5 pound

(226 GMS). Appropriate increases in these periods shall be

made for larger samples to ensure that the designated test

temperature is attained.

IPC-TM-650

Number

3.11

Subject

Thermal Shock, Connectors

Date

7/75

Revision

Page2of2

1.0 Scope

1.1

To determine the effect on the connector of the stresses

produced by mechanical vibration within the predominant fre-

quency ranges and of amplitudes that may be encountered

during field service; two input vibration types are provided:

Sinusoidal — Used to determine critical frequencies, modes

of vibration, and other data necessary for planning protective

steps against the effects of undue vibration. The simple har-

monic motion provided by this method is not representative of

most vibration encountered during field service.

Random — Used to provide a closer approximation to the

complex, non-periodic vibration encountered during field ser-

vice.

2.0 Reference Documents

2.1

Information in this section is intended to parallel the test

method described in EIA-RS-364/TP-28.

3.0 Test Specimen

3.1

A connector (plug and receptacle) complete with appli-

cable guide, keying, and engaging hardware or a card-edge

receptacle and mating nominal-thickness printed circuit

board.

3.2 Mounting and Termination

3.2.1 Right Angle, Two-Piece Connector

The receptacle

shall be mounted and terminated normally during this test;

receptacles designed for mounting on non-rigid bases (e.g.,

motherboards, metal-plate back panels, etc.) shall be

mounted on the smallest section of such a base that will

accommodate the test specimen. The plug shall be termi-

nated normally during this test and shall be mounted on a

nominal-thickness printed circuit board extending the full

width of the plug; the board shall extend a minimum of four

inches from the receptacle when the connector is mated.

3.2.2 Card-Edge Receptacle The receptacle shall be

mounted and terminated normally during this test (see 3.2.1 ).

The mating printed circuit board shall extend the full width of

the receptacle and shall extend a minimum of four inches from

the receptacle when mated.

3.2.3 Parallel, Two-Piece Connector The receptacle and

plug shall be terminated normally during this test; both com-

ponents shall be mounted on nominal-thickness printed circuit

boards extending the full width of each. The printed circuit

boards shall extend a minimum of four inches from each com-

ponent when the connector is mated.

3.3 Fixturing

3.3.1 Right Angle Connector

The test specimen shall be

held in an adequate resonant free fixture. (Figure 1, Reference

example.)

3.3.2 Parallel Connector The test specimen shall be held

in an adequate resonant free fixture. (Figure 2, Reference

example.)

3.4 The connector shall be wired (or printed circuit boards

designed) such that a continuous electrical circuit (comprising

all contacts in series) is formed when the plug (or board) and

receptacle are mated.

4.0 Apparatus

4.1

An electrodynamics vibration system and associated

instrumentation capable of producing the vibration indicated in

Table 1 and Figures 3 and 4 as specified in the individual con-

nector specification. The system shall be capable of maintain-

ing the vibratory input within the following tolerances:

Displacement – ± 10%

Acceleration – ± 10%

Power Spectral Density – ± 3.0 DB (50 Hz maximum

filter bandwidth)

Frequency – ± 2%

4.2 A circuit monitor capable of supplying a continuous cur-

rent of 100 milliamperes and of detecting discontinuities in this

current greater than 1 microsecond.

5.0 Procedure

5.1 Calibration

5.1.1

The vibration system shall be set up to provide the

sinusoidal or random vibratory input in accordance with

2215 Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST METHODS MANUAL

Number

3.12

Subject

Vibration, Connectors

Date

7/75

Revision

Originating Task Group

N/A

Material in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only

and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this

material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.

Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.

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ASSOCIATION CONNECTING

ELECTRONICS INDUSTRIES

IPC-3-12-a

Figure 1 Right Angle Connector Fixture (Suggested)

IPC-3-12-2

Figure 2 Parallel Connector Fixture (Suggested)

IPC-TM-650

Number

3.12

Subject

Vibration, Connectors

Date

7/75

Revision

Page2of6