Corporate ESD Specification
3 May 2010
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Purpose
The purpose of this document is to establish uniform Electrostatic
Discharge (ESD) Control methods.
Scope
This document applies to all Universal Instruments manufacturing
facilities and to field activities at any location worldwide.
Responsibility/Authority
The authority to review and approve this procedure resides with the
Product Safety & Code Compliance Engineer. It is the responsibility
of the Vice President, Quality and Reliability, and the local area
supervision to ensure the ESD control program is in place and that
all employees who work with ESD sensitive components and
assemblies are trained and comply with this standard.
Audit Responsibility
ESD Audits may be conducted as part of the on-going Quality
System audit process or as deemed appropriate by the ESD
Specialist or when requested by manufacturing. Audits may be
performed on an as needed basis.
Description
Note: The policy items listed are a top level description. For
detailed information concerning these ESD control items, see UIC
Part Numbers 41078411 and 42363901.
4.1
CONTROLLING ESD
Unless otherwise stated, assume all electronic components, subassemblies, and assemblies are ESD sensitive (ESDS).
Mechanical Assemblies with electronics attached are ESDS
assemblies
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Corporate ESD Specification
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IN RECEIVING
Electrostatic Discharge Sensitive (ESDS) components, subassemblies, or assemblies, shall be handled using proper ESD
handling controls at an approved ESD Work Station or Area must
be used. See Handling, 4.1.5.
4.1.2
PACKAGING
ESDS devices and assemblies should be packaged to promote
ESD protection (static shielding), as well as structural integrity. At a
minimum, populated PC Boards shall be in transparent static
shielding bags with an industry-standard ESD awareness warning
label ((JDEC-14 or RS471) on the bag which identifies ESD
sensitive devices that require static safe handling. The bag should
be large enough to cover the board and close easily without stress.
If a non-zip lock static shielding bag is used, it should be large
enough to allow at least two inches folded over the end to form a
seal without stress, and held in place with an industry-standard ESD
warning label. No staples or scotch tape are allowed to seal the
bag. Anti-static (pinkpoly) bags are not allowed for ESD devices.
Static generating materials are not allowed to be used as sealing or
labeling.. See UIC Part Number 41078411. ESDS Assemblies too
large for static shielding bags shall be packaged in approved static
protection packaging
ESDS PC Boards that can puncture the static shielding bag should
be packaged with conductive foam on the pins or other sharp
protrusions prior to being placed in the static shielding bag.
Individual ESDS components such as ICs, SIPs, and DIPs shall be
placed in sulfur free conductive foam. The foam and components
shall be placed in a static shielding bag or box. The bag or box
shall be labeled using standard ESD warning labels.
Bulk ESDS components such as ICs, SIPs, and DIPs will be
packaged in anti-static tubes or conductive trays. ESDS
components packaged in anti static packaging shall be enclosed in
static shielding bags or boxes. The bags or boxes shall be labeled
with an industry-standard ESD warning label, and part number.
4.1.3
SHIPPING
UIC machines, assemblies, and sub-assemblies are ESD sensitive
assemblies. Do not use static generating material as shipping
restraints, brackets, or to wrap the machines unless approved by
the ESD Specialist. All foams used to ship exposed ESDS
assemblies shall be anti static foam.
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STORAGE
All ESDS devices should be stored in sealed static shielding
packaging until the time they are required for use in the
manufacturing process. These items should be protected from all
static generating activity or material prior to and during the
manufacturing process.
ESDS devices are counted or dispensed for kitting shall be done at
an approved ESD area or workstation.
Storage of PC Boards in static shielding bags shall be placed on
grounded shelves or if in boxes or other non-static generating
materials on non-static generating materials.
4.1.5
HANDLING
All handling of unprotected ESDS devices shall be completed at an
approved ESD Area, workstation, or approved field service portable
workstation while properly grounded.
4.1.6
WORKSTATIONS
The workstation must be approved by the ESD Specialist. For
approved workstation configuration, refer to UIC Part Number
46165901
4.1.7
PERSONNEL GROUNDING
Personnel must be grounded used personal grounding devices prior
to removing the product from ESD protective packaging or working
on ESDS devices or assemblies.
If working on an ESD dissipative floor: (Excluding WPSD area)
 All personnel must wear heel or toe straps or conductive
footwear on both feet.
 Heel straps or conductive footwear does not preclude the
use of a wrist strap.
 Prior to use, all personnel shall test personal ESD control
devices at least daily.
 Wrist straps when used with a constant wrist strap monitor
need not be tested.
 Heel straps are not required in aisle ways defined by red
tape stripes on the floor.
 When working on machines or when positioned that the heel
straps are not in contact with the floor, wrist straps shall be
worn.
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Proper Method for Testing ESD Straps/Footwear
Proper application of straps:
It is important that heel or toe straps are worn correctly
in order to pass the test at ESD test stations. The strap
must be situated under your shoe so that it makes full
contact with the floor.
The conductive ribbon can be tucked in between your
sock and skin or between your shoe and your sock. You
may have to try both methods in order to pass the ESD
test station.
Testing the straps/footwear:
1. With both feet on the test mat, depress and hold the
button on the test station, the Green LED should
illuminate.
2. While still pressing the test button, lift your right foot
away from the test mat. The Green LED should stay
illuminated.
3. Place your right foot back on the test mat and pick up
your left foot while still pressing the test button. The
Green LED should stay illuminated.
4. Place both feet on the floor off of the test mat while
still pressing the test button. The Green LED should go
off and the Red LED should illuminate.
5. If the outcome of above tests is as defined above, the
straps/footwear has passed the test. Sign the log next to
the station and initial the appropriate day or date column.
Test Failure:
1. If the high resistance RED LED should illuminate,
reposition the effected strap on the shoe and the ribbon
in the shoe or the sock. Retest the strap.
2. If no improvement, your skin may be too dry. Use IC
Lotion or other skin moisturizer and situate the ribbon. If
placing the ribbon between your shoe and sock, your
sock may be too dry. Some people require a longer
period of time before there is enough moisture from the
foot to make the strap work. Place the ribbon in your
sock until there is enough moisture in the sock. Retest
the strap.
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3. If there is still no improvement, obtain a new strap
and retest. If there is no improvement, see supervisor
immediately prior to entering an area inside the red
taped lines on the manufacturing floor.
4.1.9
Proper Method for Testing ESD Wrist Straps
Proper application of Wrist Straps:
It is important for the second part of the wrist strap
test that the wrist strap fits properly. The wrist straps
should fit snug but not tight. The elastic band should
be stretched to obtain the snug feeling.
Testing the Wrist Straps:
1. Remove the foot wear test pad jack from the
tester jack and plug in the wrist strap.
2. With the wrist strap held by the band opposite of
the snap between the fore finger and the thumb of
one hand, touch the button of the tester with the
other hand. The Green LED should illuminate if the
resistance of the wrist strap is satisfactory.
3. While still holding the band and touching the
button, wiggle the band and cord making sure the
Green LED remains illuminated.
4. With the wrist strap properly worn on a wrist,
touch the test button with the fore finger of the
opposite hand from the wrist strap. The Green LED
should illuminate.
5. If the outcome of above tests is as defined
above, the wrist strap has passed the test. Sign the
log next to the station and initial the appropriate day
or date column. Remove the wrist strap from the
tester and replace the mat jack.
Test Failure:
1. If the Red LED illuminates indicating a high
resistance following Steps 2 and 3 of the Wrist Strap
Test, obtain new wrist strap and test it in the same
manner.
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2. If the wrist strap passed steps 2 and 3 and fails
step 4, remove the wrist strap, use moisturizer
cream on the wrist strap area of the wrist. Put wrist
strap back on and retest. The Green LED Should
illuminate. If the Red LED Illuminates remove wrist
strap and obtain new unit.
4.2
Product Grounding:





Populated PC Boards shall be placed inside covered static-shielding
totes or in individual static-shielding bags prior to transfer from one
place to another.
When carts or bread racks are used to transport unprotected
assemblies or sub-assemblies, the shelves shall have dissipative
surfaces that must be connected electrically to each other and
ground,.
All ESDS devices must maintain contact with the dissipative surface
on the rack. If card holders are used on the rack, they must be
dissipative / conductive and electrically connected to the cart.
Racks used for storage of sensitive devices and assemblies shall be
grounded.
Prior to removing ESDS devices and assemblies from ESD
Protective packaging, personnel handling such devices are required
to wear properly fitting grounding devices connected to ground.
References
5.1
5.2
5.3
5.4
5.5
5.6
5.7
MAKE015 Handling, Storage, Packaging and Delivery
41078411 Suggested ESD Design Guidelines
42363901 Handling Specification for Maximum Reliability of
Electronic Components and Assemblies
46165901 ESD Audit Checklist
ATT Electrostatic Discharge Control Handbook
Electrostatic Discharge and Electronic Equipment IEEE Press
CORP006 Internal Assessment Process
End of Document
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