IPC-TM-650 EN 2022 试验方法.pdf - 第814页

1 Scope This test method is used to determine the effects of long term operation of components in atmospheres con- taining industrial gaseous pollutants. It consists of exposure to a flowing-gas humid atmosphere containi…

5.2 Evaluation

5.2.1

Record and report resistance vs. number of rocking

cycles.

6 Notes

6.1

Keithley Model 503 Milliohmmeter may be purchased

from:

KEITHLEY INSTRUMENTS, INC.

28775 Aurora Road

Cleveland, Ohio 44139

(216) 248-0400

IPC-3-16-2

Figure 2 Method of Making Contact Resistance Measurements

IPC-TM-650

Number

3.16

Subject

Fretting Corrosion, Connectors

Date

2/78

Revision

Page2of2

1 Scope This test method is used to determine the effects

of long term operation of components in atmospheres con-

taining industrial gaseous pollutants. It consists of exposure to

a flowing-gas humid atmosphere containing SO

S, and

in concentrations of 200 parts per billion (ppb). This cor-

responds to a worst-case polluted atmosphere, and is an

accelerated exposure to normal, average pollutant level atmo-

sphere. An acceleration factor of 30-40 is associated with this

test.

1.2 To further simulate and accelerate conditions obtained

in operating environments, the test also involves temperature

and humidity cycling, so as to cause breathing and moisture

condensation on the test samples.

2 Applicable Documents None

3 Test Specimen

3.1

Any pre-production or production samples wired and

mated as intended for actual use

4 Apparatus

4.1

Test chamber and its associated control equipment

capable of producing and maintaining the conditions of 4.1.1

and 4.1.2

4.1.1 Capable of cycling the temperature between 68°C

and 26°C with the following schedule:

Eight hours at 68°C

One hour transition to 26°C

Two hours at 26°C

One hour transition to 68°C

These 12-hour cycles are to be repeated continuously for the

duration of time specified for the exposure.

4.1.2 Capable of maintaining 80% RH ± 5% RH during the

68°C dwell time. Uncontrolled during temperature transitions

so as to allow condensation on the samples.

4.2 Gaseous Atmospheric Pollutants Concentrations of

200 ppb in normal air (N

- 20% O

) of the following pollutants

shall be maintained in the exposure chamber at all times:

S (200 ppb)

(200 ppb)

A convenient and satisfactory way of producing this environ-

ment is the ‘‘Battelle Flowing Gas System.’’ In this system, the

pollutant concentrations are maintained through the use of

permeation tubes, which are small Teflon tubing sections,

about 2 cm long, sealed at both ends, and containing the pol-

lutant of interest as a liquid at room temperature. These per-

meation tubes are placed in the main air stream, which feeds

the exposure chamber, and the concentrations of the pollut-

ants are determined by the diffusion rates of the gas out of the

permeation tubes. At a constant flow rate and temperature of

the main air stream, the concentration of pollutants will be

constant. Periodic weighing of the permeation tubes may do

pollutant gas ‘‘analysis.’’

The flow rate of the main air stream is such that the exposure

chamber volume is exchanged approximately every 30 min-

utes.

5 Procedure

5.1

Wire and mate the test specimen as in normal intended

operation during exposure in this test.

5.2 The duration of this test is generally calculated from the

expected service lifetime of the product.

5.3 The actual duration of this exposure is to be determined

between vendor and user and/or is a part of the applicable

product specification. A 60-day exposure in this test corre-

sponds to approximately six years of exposure in normal

industrial environments.

6 Notes

6.1 Reference

Abbott, W. H., Effects of Industrial Air Pol-

lutants on Electrical Contact Materials, Holm Seminar on Elec-

tric Contact Phenomena, November 1973.

2215 Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST METHODS MANUAL

Number

3.17

Subject

Industrial Gas Test (Battelle Method), Connectors

Date

2/78

Revision

Originating Task Group

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.

Page1of1

ASSOCIATION CONNECTING

ELECTRONICS INDUSTRIES

1 Scope This test method is used to determine the

mechanical forces required to mate connectors before and

after the connectors are subjected to various environmental

stresses.

2 Applicable Documents None

3 Test Specimen

3.1

One piece connector (plug and receptacle), complete

with all applicable guide, keying, and engaging hardware or a

carot edge receptacle

3.2 Two piece connector (header and receptacle or plug

and receptacle), complete with all applicable guide, keying,

and engaging hardware and appropriate flat cable

3.3 Unless otherwise specified in the individual connector

specification, the test samples (or engaging hardware) shall

not be lubricated or otherwise coated prior to the test.

4 Apparatus

4.1

Test blade as shown in Figure 1, to simulate a mating

PWB of maximum thickness for card edge (one-piece) con-

nector

4.2 Mating connector to test for mating and unmating force

of two piece connectors

4.3 Force gauges of applicable range

4.4 Clamps, jaws, or other means to hold the receptacle

and header or receptacle and plug

4.5 Automatic or semi-automatic tester to mate and unmate

the connector at the specified rate.

Note: While manual cycling of the connectors is permitted,

proper alignment and orientation is most readily maintained in

a mechanical device specifically designed for this test.

5 Procedure

5.1

The samples shall be mounted in the tester and carefully

aligned.

5.2 Mating Force The samples shall be brought to a posi-

tion where mechanical mating begins and the force gauge is

at zero indication. The samples shall then be fully mated and

the force required for mating shall be recorded.

5.3 Unmating Force Once the mechanical mating is com-

plete and the force gage is at zero indication, the samples

shall be separated and the force required for separation shall

be recorded.

5.4 At the intervals specified in the individual connector

specification, inspections or tests may be performed.

5.5 During the final cycle, the force required for both mating

and unmating shall again be recorded.

6 Notes

6.1

Acceptance criteria shall be established in terms of the

maximum allowable total mating force and the minimum

allowable total separation force during the test.

6.2 The information in this test method is intended to paral-

lel the test method described in EIA-RS-364/TP-13.

2215 Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST METHODS MANUAL

Number

3.18

Subject

Mating and Unmating Force, Connectors

Date

1/83

Revision

Originating Task Group

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.

Page1of2

ASSOCIATION CONNECTING

ELECTRONICS INDUSTRIES