IPC-TM-650 EN 2022 试验方法.pdf - 第75页

1 Scope This test method is used to establish and define the procedures for determining thermal gradient dimensional changes of a plastic dielectric, metal clad or unclad. This method may also be used to determine dimens…

1.0

Scope

This

method is intended to describe optically

enhanced measurement techniques for dimensions of 3 mm

or less, typically referenced on a Printed Board drawing. This

method will not cover mechanical dimensional verification

which is covered by IPC-TM-650, Method 2.2.1. This method

is intended to supersede IPC-TM-650, Method 2.2.3.

2.0

Applicable Documents

IPC-OI-645

Standard

for Visual Optical Inspection Aids

IPC-A-600E

Acceptability

of Printed Boards

3.0

Test Specimens

3.1

The

test specimen(s) shall be defined in the applicable

performance specification or standard.

4.0

Apparatus or Material

4.1

Optical

inspection aid capable of a magnification where

the feature(s) to be measured occupies at least 20% of the

field of view. (See IPC-OI-645 for detailed description.)

4.2

Reticle

or Filar Micrometer attachment to Optical Inspec-

tion Aid that contains gradiations or a scale, which will provide

a minimum measurement resolution of 50% of the last signifi-

cant digit of the referenced dimensional requirement. The

Reticle or Filar Micrometer should be calibrated at the given

magnification to ascertain the distance in mm (inches)

between each division.

5.0

Procedure

5.1

Select

an optical aid which allows for clear viewing of the

area(s) containing the attributes to be measured.

5.2

Adjust

the optical aid so that both the feature(s) to be

measured and the reticle or filar micrometer attachment are in

focus.

5.3 Align

the reticle or filar micrometer so that the measure-

ment scale is visible and aligned with the edges of the fea-

ture(s) to be measured.

5.4 Read

the reticle or filar micrometer to obtain the number

of divisions between feature edges.

5.5

obtain the actual dimensions of the feature, multiply

the number of divisions read by the calibration data previously

obtained for the reticle or filar micrometer in (µm/division)

(inches/division) at the given magnification.

5.6

Record

the dimensions for the attribute(s) measured

using the same number of significant digits specified by the

drawing, standard, or specification as a minimum or maximum

limiting value.

6.0 Notes

6.1

For

a thorough description of the requirements, defini-

tions, and certification provisions for optical inspection aids,

see IPC-OI-645.

6.2

IPC-A-600

contains figures and diagrams which depict

measurement techniques for certain attributed.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062

IPC-TM-650

TEST

METHODS MANUAL

Number

2.2.2

Subject

Optical

Dimensional Verification

Date

8/97

Revision

Originating Task Group

Rigid Board T.M. Task Group, 7-11d

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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Scope

This

test method is used to establish and define

the procedures for determining thermal gradient dimensional

changes of a plastic dielectric, metal clad or unclad.

This method may also be used to determine dimensional

changes after metal removal of a clad.

Applicable Documents

None

Test Specimen

The

test specimen shall be at least 27

cm x 29 cm of unclad or metal clad dielectric material cut and

punched per Figure 1.

Test Equipment

• Shear —

for cutting 27 cm x 29 cm test specimens.

• Micro-Rule — with dial indicator reading to 0.0125 mm or

less or an equivalent optical system.

• Hole Punch — 0.889 mm minimum diameter.

• Oven — mechanical convection type capable of maintaining

a temperature of 150°C ± 2°C.

• Etcher — capable of maintaining test specimens a 43°C ±

5°C during the metal removal.

• Line Scribe — capable of producing a line 0.125 mm wide

maximum.

• Chemical Etchant — capable of metal removal without det-

rimental effect to either the adhesive or dielectric.

Procedure

5.1 Sample Preparation

Scribe

0.125 mm wide lines or

punch holes at positions A through D in specimen at locations

shown in Figure 1.

Allow specimen to stabilize at 23°C ± 2°C and 50% ± 5%

relative humidity (RH) and measure separation of holes/lines

between corresponding positions (center of hole or center of

line). For example, the distance between hole centers A-B and

C-D, also A-C and B-D. Record as initial measurement (1).

Stabilization times may be reduced if statistically sound evi-

dence has been generated on the specific product line to

support shorter stabilization times to reach equilibrium.

IPC-224-1

Figure

1 Dimensional Stability Test Pattern

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062

IPC-TM-650

TEST

METHODS MANUAL

Number

2.2.4

Subject

Dimensional

Stability, Flexible Dielectric Materials

Date

5/98

Revision

Originating Task Group

Flex Peel Strength Test Methods Task

Group (D-13A)

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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Twenty-four

hour stabilization is referee method.

5.2

Method A

Dimensional

stability of unclad material due

to thermal exposure—standard condition.

(1) Place test specimen unconstrained in an oven maintained

at 150°C ± 2°C for 30 ± 2 minutes.

(2) Cool specimen to standard conditions of 23°C ± 2°C and

50% ± 5% RH for 24 hours minimum (see 5).

(3) Remeasure separation of holes/lines and record as final

measurement after thermal exposure (F

5.3

Method B

Dimensional

stability of metal clad dielectrics

due to metal removal.

(1) Chemically erode the metal away except for the target

areas, which can have up to 13 mm x 13 mm square metal,

using an etchant that has no detrimental effect on either the

dielectric or adhesive. Wash and dry. The test specimen

should be unconstrained during the etching, washing, and

drying operation.

(2) Stabilize test specimen for 24 hours at 23°C ± 2°C and

50% ± 5% RH (see 5.1).

(3) Remeasure separation of holes/lines and record as final

measurement after etching (F

5.4

Method C

Dimensional

stability of dielectric due to

thermal exposure and metal removal, using specimens from

Method B.

(1) Place unconstrained etched, conditioned, and measured

specimen from Method B in an oven maintained at 150°C ±

2°C for 30 ± 2 minutes.

(2) Stabilize specimen at 23°C ± 2°C and 50% ± 5% RH for

24 hours and remeasure separation of holes (see 5.1).

(3) Remeasure separation of holes/lines and record as final

after etching and thermal exposure (F

5.5

Calculate

the linear dimensional changes as follows:

(Start with initial reading (I) from 5.1)

M.D. =

(A−B)

−(A−B)

(A−B)

(C−D)

−(C−D)

(C−D)

100

T.D. =

(A−C)

−(A−C)

(A−C)

(B−D)

−(B−D)

(B−D)

100

Where:

M.D. = % change in machine dimension.

T.D. = % change in transverse dimension.

I = Initial Reading.

F = Final Reading (Either F

A-B

= Distance Between PointsA&B.

A-C = Distance Between PointsA&C.

C-D = Distance Between PointsC&D.

B-D = Distance Between PointsB&D.

6 Notes

The

alternate method for marking clad samples

allows the use of scribed lines. Caution must be used to pro-

tect scribed lines during etch operation.

IPC-TM-650

Number

2.2.4

Subject

Dimensional

Stability, Flexible Dielectric Materials

Date

5/98

Revision

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