IPC-TM-650 EN 2022 试验方法.pdf - 第74页

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 v…

1.0

Scope

This

method is intended to cover all mechanical

dimension inspections typically referenced on a Printed Board

drawing. This will cover non-optically enhanced measurement

techniques which are not covered by IPC-TM-650, Method

2.2.2.

2.0

Applicable Documents

ANSI NCSL Z540

International

Calibration Standards or

Physical Constants

3.0

Test Specimens

The

test specimen(s) shall be defined

in the applicable performance specification or standard.

4.0

Apparatus or Material

4.1

Mechanical

measurement gage capable of sufficient

accuracy precision and resolution to accomplish the neces-

sary measurement (i.e., calipers, micrometers, pin gages,

templates, etc.).

4.2

All

mechanical measurement gages shall be calibrated in

accordance with ANSI NCSL Z540, International Calibration

Standards or Physical Constants.

5.0

Procedure

5.1

Gages which use an origin based system (i.e., calipers,

micrometers) shall be initialized at the origin.

5.2

Operate

the gage in a manner consistent to obtain the

accuracy, repeatability, and precision required.

5.3 If

the attribute to be measured can vary across the

printed board, multiple measurements must be made to char-

acterize the variation within the sampled area (i.e., hole sizes,

thickness).

5.4

Read

and record the dimensions for the attribute(s)

measured using the same number of significant digits speci-

fied by the drawing, standard, or specification as a minimum

or maximum limiting value.

6.0 Notes

The

following items can affect the test results.

Tool wear & maintenance

Environment effects

Delicacy of gages – proper storage

Improper calibration

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062

IPC-TM-650

TEST

METHODS MANUAL

Number

2.2.1

Subject

Mechanical

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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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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