Static Solutions CT-8900 Combo Tester Instructions 1/15/2015
9
TESTING OF WRIST STRAPS AND FOOTWEAR
Daily testing of wrist straps and footwear is mandatory to ensure the grounding devices function properly and to minimize charge
generation on the human body, which may cause damage to integrated circuits. Partially conductive footwear and wrist straps
are the primary techniques used to drain and minimize electrical charges from the body. The wrist and foot straps typically have
a 1 megohm or two megohm resistor built into them. Too low a resistance can cause rapid discharge resulting in sparking and
failures. Low resistance wrist or foot straps can also cause an electrical shock to the operator if he touches a high voltage circuit.
On the other hand, open circuit or broken straps can cause high electrical resistant paths that result in static buildup, arcing, and
integrated circuit damage.
To adapt to ISO-9000 certification the results should be recorded in a computer database or printed to hard copy as specified in
EOS 20/20 specification.
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