IPC/WHMA-A-620B TRAINING AND CERTIFICATION PROGRAM

Transcription

IPC/WHMA-A-620B
TRAINING AND CERTIFICATION PROGRAM
FOR CERTIFIED IPC TRAINERS (CIT)
5. Module(s) _________________are prerequisite training for IPC/WHMA-A-620 Certified IPC
Application Specialist (CIS) certification.
A.
B.
C.
D.
1 and 3
1 and 2
1 through 18
1
Answer: D
Reference: Lecture
6. CITs should forward (electronically) the training report form for CIS training to the IPC within
____________of the completion of each training session.
A.
B.
C.
D.
2 days
1 month
1 week
2 weeks
Answer: D
Reference: Page 8, Clause 8.0.1 Policy
7. CIS retesting (of previously failed training modules) may be administered only after a minimum study/
review period not sooner than…
A.
B.
C.
D.
24 hours
1 week
60 days
30 days
Answer: A
Reference: Page 7, Clause 6.4.1 Policy
© 2013, IPC, Bannockburn, IL All rights reserved.
For use only in IPC Training Programs leading to
Official IPC Certification
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IPC/WHMA-A-620B
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IPC/WHMA-A-620B
REVIEW QUESTIONS
SESSION 2 – REQUIREMENTS AND ACCEPTANCE FOR CABLE AND WIRE HARNESS
ASSEMBLIES AND APPLICABLE DOCUMENTS
1. The tolerance for magnification aids is________
Answer: ±15%
Reference: Page 1-6, Clause 1.17.1.2 Magnification Aids
2. The manufacturer shall __1__2__3 have a documented calibration system.
Answer: N1D2D3
Reference: Page 1-4, Clause 1.13.2 Calibration
3. Conditions that are not specified as defective or as a process indicator are considered _______
Answer: Acceptable
Reference: Page 1-6, Clause 1.15.7 Conditions Not Specified
4. A condition that fails to meet the acceptance criteria of IPC/WHMA-A-620B and negatively
affects the form, fit or function of the assembly in its end use environment is ______.
Answer: Defect
Reference: Page 1-5, Clause 1.15.4 Defect
5. Illumination at the surface of workstations should be _______________ minimum.
Answer: 1000 lm/m2 (Lumens per square meter)
Reference: Page 1-6, Clause 1.17.1.1 Lighting
6. In the case of a discrepancy between the written criteria or the illustrations, which takes
precedence?
Written criteria
Illustrations
Answer: Written Criteria
Reference: Page 1-5, Clause 1.14 Figures and Illustrations
7. A condition that is close to perfect defines a ____________condition.
Answer: Target
Reference: Page 1-5, Clause 1.15.1 Target
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IPC/WHMA-A-620B
8. When inspecting a 22 AWG wire the inspection magnification range shall be ________
Answer: 1.5X – 3X
Reference: Page 1-6, Clause 1.17,1,2 Magnification Aids (Table 1-2)
9. The criteria defined in the IPC/WHMA-A-620B reflect three product classes:
Class 1 _______________, Class 2 _______________ and, Class 3 _______________
Answer: General Electronic Products
Dedicated Service Electronic Products
High Performance Electronic Products
Reference: Page 1-3, Clause 1.8 Classes of Product
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IPC/WHMA-A-620B
5.3.5 Machined Contacts – CMA Buildup
Slide S5-52
Instructor Activity:
Review CMA buildup requirements.
Continued on next page.
Instructor Notes:
Target - Class 1,2,3
• The CMA of the conductor is built up so that it
falls within the minimum and maximum CMA
range of the contact.
• The CMA range is built up using one of the
methods listed below:
o The conductor is folded or bent back to
achieve the correct CMA buildup.
o The conductor area is increased by the use of
bare (noninsulated) filler conductors as
needed to achieve the correct CMA buildup.
o A combination of both the foldback and the
filler method are used to achieve the correct
CMA buildup.
o Special ‘‘CMA Adapter Bushings’’ are used
when called out on the assembly
documentation. (Use of these adapters will
usually require special additional insulating
coverage requirements.)
• The filler is visible at the wire entry end of the
barrel.
Acceptable - Class 1,2,3
• The filler conductors and/or the wire conductor
are visible in the inspection window of the
contact.
• The filler conductor is of the same type
conductor as the wire being crimped into the
contact. (Gauge can be different as needed but
the base metal and the plating, if any, needs to be
the same.)
• Fill conductor extends beyond the contact a
maximum of one wire diameter of the primary
wire (red arrow).
• The flair or splay of any fill conductor does not
extend past or exceed the contact diameter.
S5-53
IPC/WHMA-A-620B
5.3.5 Machined Contacts – CMA Buildup
Defect - Class 1,2,3
•
•
•
Fill conductor extends beyond the contact more
than 1 wire diameter of the primary wire.
Fill conductor or foldback are not visible at wire
entry end.
Fill conductor not the same type as primary
conductor.
•
•
Slide S5-53
•
Review CMA buildup requirements.
•
Solid conductors used to build up the CMA.
The filler conductors and/or the wire conductor
are not visible in the inspection window.
The flair or splay of any filler conductor used
extends past or exceeds the contact diameter.
Exposed conductor violates minimum
electrical clearance.
Instructor Notes:
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IPC/WHMA-A-620B
Review
Slide S5-56
Session review
Instructor Notes:
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IPC/WHMA-A-620B
REVIEW QUESTIONS
SESSION 5 – Crimp Terminations (Contacts and Lugs)
1. If both insulation crimp tabs are not in contact with the top of the insulation, the condition is
[__1__2__3].
Answer: Defect - Class 1,2,3
Reference: Page 5-7, Clause 5.1.1.2 Stamped and Formed – Open Barrel – Insulation Support
– Crimp
2. If multiple leads extend past the bellmouth on a stamped and formed closed barrel contact but are
not equal in length, the condition is [__1__2__3].
Answer: Acceptable - Class 1,2,3
Reference: Page 5-19, Clause 5.2.3 Stamped and Formed – Closed Barrel – Conductor Crimp
and Bellmouth
3. If the bellmouth height at the conductor entry end of a stamped and formed open barrel contact is
2X the thickness of the contact or terminal base metal, the condition is [__1__2__3].
Answer: Target - Class 1,2,3
Reference: Page 5-11, Clause 5.1.4 Stamped and Formed – Open Barrel – Crimp Bellmouth
4. On a machined crimp contact, if the crimp is not centered but the inspection window is not
deformed, the condition is [__2__3].
Answer: Acceptable - Class 2,3
Reference: Page 5-27, Clause 5.3.4 Machined Contacts – Crimping
5. On an open barrel stamped and formed contact, any loose conductor strands that are outside the
crimp area, trapped strands, or folded back strands are [__1__2__3].
Reference: Page 5-10, Clause 5.1.3 Stamped and Formed – Open Barrel – Conductor Crimp
6. A solid conductor used to build up the circular mil area (CMA) of an under size conductor on a
machined contact is [__1__2__3].
Reference: Page 5-30, Clause 5.3.5 Machined Contacts – CMA Buildup
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IPC/WHMA-A-620B
8.1.2 Soldered Splices – Wrap
Wrapped splices require a longer amount of wire
to complete the splice. Strip wire to allow a
minimum of 3 wraps (not twists) of each wire
around the other.
Slide S8-14
Figure 8-6 shows a proper wrap splice
with at least 3 wraps of wire.
Instructor Notes:
S8-15
IPC/WHMA-A-620B
8.1.2 Soldered Splices – Wrap
Slide S8-15
Figure 8-7 shows the same wrapped wire
after being soldered. Figure 8-8 shows
insulation sleeving over the spliced area
with a minimum of 1 wire diameter
overlap.
Acceptable - Class 1,2,3
 Interlocking of 2 wires into a smooth joined
section for a minimum of 3 wraps of each
conductor.
 Solder is wetted forming a visible solder
fillet joining the wires for the length of the
splice contact area.
 Individual wire strands are discernible.
 Conductor strands form a smooth joined
section.
 Conductor strands are covered with sleeving.
 Sleeving is snug to the splice and wire
insulation.
 No conductor strands piercing the sleeving.
 Sleeving is not split or damaged.
 Sleeving covers wire insulation on both ends
of the spliced area by a minimum of 1 wire
diameter.
 Sleeve or wire insulation is slightly
discolored but not charred.
Instructor Notes:
S8-16
IPC/WHMA-A-620B
8.2.4 Wire In-Line Junction Devices (Jiffy
Junctions)
Wire in-line junction devices, sometime referred
to as ‘‘Jiffy Junctions,’’ are essentially feed
through environmentally resistant disconnect
components for joining wires.
Crimp contacts are terminated onto conductors
(see Figure 8-59) and then inserted into the inline junction device as it would be with a rearentry machined contact connector (see Figure 860 shown in cross-section).
Slide S8-48
Explain the general requirements for Jiffy
Junctions.
The tooling, tooling verification, crimping
processes, and completed terminations shall
[D1D2D3] comply with the requirements for tool
control and machined contact crimped
terminations in Chapters 1 (Forward), 5 (Crimp
Terminations) and 19 (Testing).
When the CMA of the conductor needs to be
built up so that it falls within the minimum and
maximum CMA range of the contact, CMA
buildup shall [D1D2D3] be in accordance with
5.3.5.
Instructor Notes:
As an exception to 9.5.2, when a sealing plug is
required it shall [D1D2D3] be inserted shaft
first.
S8-49
IPC/WHMA-A-620B
8.2.4 Wire In-Line Junction Devices (Jiffy
Junctions)
Slide S8-49
Review the defect conditions for Jiffy
Junctions.
Publication should state Defect – Class
1,2,3.
 Multiple wire attachments, when used, do not
meet the requirements of 5.3.
 Insulation clearance does not meet the
requirements of 5.3.1.
 The conductor location does not meet the
 Crimping does not meet the requirements of
5.3.4.
 CMA buildup, when used, does not meet the
 Contact installation does not meet the
requirements of 9.5.
 Qualification of crimped connection fails
Pull Force/Tensile Test per 19.7.2.
 Mated assembly fails Pull Test Contact
Retention Verification Test per 19.7.5.
Instructor Notes:
S8-50
IPC/WHMA-A-620B
REVIEW QUESTIONS
SESSION 9 – CONNECTORIZATION
1. A boot overlapping the cable sleeving or jacket at least ____ cable diameters in length is Target
– Class 1,2,3.
Answer: 3
Ref: Page 9-10, Clause 9.3.1 Sleeving and Boots – Position
2. A soft face connector that has material missing with no damage to the dielectric between cups is
[__1__2__3].
Answer: [A1P2P3]
Ref: Page 9-17, Clause 9.4.3 Connector Damage – Limits – Soft Face – Mating Surface or Rear
Seal Area
3. Contact(s) missing when unused positions are required to be filled are [__1__2__3].
Answer: [D1D2D3]
Ref: Page 9-20, Clause 9.5.1 Installation of Contacts
4. Hard face connector chipping that does not extend from one cavity to the outer
diameter of any adjacent cavity is [_1_2_3]
Answer: [A1P2D3]
Ref: Page 9-16, Clause 9.4.2 Connector Damage – Limits – Hard Face – Mating Surface
5. If strain relief sleeving is visible between the clamp and connector and the split-lock washers are
collapsed, the condition is [__1__2__3].
Answer: [Target 1, 2, 3]
Ref: Page 9-6, Clause 9.2.1 Strain Relief – Clamp Fit
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IPC/WHMA-A-620B
REVIEW QUESTIONS
SESSION 14 – SECURING
1. Cable lacing begins and ends with a _______________.
Answer: Locking knot
Ref: Page 14-4, Clause 14.1 Tie Wrap/Lacing Application
2. Wires in a wire bundle that twist and crossover underneath a restraining device are [__1__2__3].
Answer: Acceptable - Class 1
Process Indicator - Class 2
Defect - Class 3
Ref: Page 14-13, Clause 14.3.1 Routing – Wire Crossover
3. Damage on restraining devices such as minor fraying, nicks, or wear of less than ____ of the
device thickness is Acceptable – Class 1,2, Defect – Class 3.
Answer: 25%
Ref: Page 14-7, Clause 14.1.2 Tie Wrap/Lacing Application – Damage
4. When applying a tie wrap, if the cut end protrusion is greater than the tie wrap thickness, the
condition is [__1__2__3].
Defect - Class 3
5. If the spacing of the first restraint from a breakout is more than 3 diameters of the breakout wire
bundle, the condition is [__1__2__3].
Defect - Class 3
Ref: Page 14-12, Clause 14.2.2 Breakouts – Spacing
6. Spot ties or wraps placed over splices or ferrules contained in the wire bundle are
[_1_2_3].
Answer: Acceptable - Class 2,3
S14-43
IPC/WHMA-A-620B
7. Spot ties or wraps placed over splices or ferrules contained in the wire bundle are [__1__2__3].
Defect - Class 3
Ref: Page 14-17, Clause 14.3.5 Routing – Ties over Splices and Ferrules
S14-44
IPC/WHMA-A-620B
REVIEW QUESTIONS
SESSION 15 – HARNESS/CABLE ELECTRICAL SHIELDING
1. A back braid lock stitch (Direct Applied) of at least _______ is Acceptable – Class 1, 2, 3.
Answer: 13 mm [0.5 in]
Ref: Page 15-3, Clause 15.1.1 Braided – Direct Applied
2. A shrink shield termination on a connector is Target – Class 1,2,3 if the shield is approximately
__________ from the backshell.
Answer: 3 mm [0.12 in]
Ref: Page 15-16, Clause 15.3.1 Shield Termination – Connector – Shrink
3. Strip length on braid and shield wire on an attached lead with a heat shrinkable solder device is
Acceptable – Class 1,2,3 if it does not exceed _____ and is greater than _____.
Answer: 6 mm [0.24 in] - 3 mm [0.12 in]
Ref: Page 15-8, Clause 15.2.1.1.1 Shield Termination – Shield Jumper Wire – Attached Lead –
Solder
4. For a shield termination with no shield wire, when the sleeving overlaps less than 1 wire or
bundle diameter, the condition is [__1__2__3].
Defect - Class 2,3
Ref: Page 15-15, Clause 15.2.2.1 Shield Termination – No Shield Jumper Wire – Shield Not
Folded Back
5. A shield termination splice in which a solder fillet is present around the entire shield overlap
area, the area is flexible, and the shield weave pattern is disturbed is [_1_2_3].
Process Indicator - Class 2,3
Ref: Page 15-22, Clause 15.4.1 Shield Termination – Splicing Prewoven – Soldered
S15-61
IPC/WHMA-A-620B
6. Tape overlap (barrier or conductive) of ________ is Target – Class 1,2,3.
Answer: 50%
Ref: Page 15-24, Clause 15.5 Tapes – Barrier and Conductive, Adhesive or Nonadhesive
7. On a shield termination with no shield wire, an exposed shield equal to or less than 3 mm [0.12
in] is [__1__2__3].
Answer: Acceptable - Class 1,2,3
Ref: Page 15-14, Clause 15.2.2.1 Shield Termination – No Shield Jumper Wire – Shield Not
Folded Back
S15-62

IPC/WHMA-A-620B TRAINING AND CERTIFICATION PROGRAM

Transcription

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