H11-811 · Question #72
Before replacing a U1900 board, you need to wear grounded electrostatic discharge (ESD) wrist strap to prevent electric circuits from being damaged by ESD. Then, you can directly touch the electric…
The correct answer is B. FALSE. B is correct because the statement contains a critical error in its second clause: even when wearing a properly grounded ESD wrist strap, you must never directly touch the electric circuits on a board. The wrist strap equalizes electrostatic potential between you and the board…
Question
Before replacing a U1900 board, you need to wear grounded electrostatic discharge (ESD) wrist strap to prevent electric circuits from being damaged by ESD. Then, you can directly touch the electric circuits in the board when replacing the board.
Options
- ATRUE
- BFALSE
How the community answered
(33 responses)- A18% (6)
- B82% (27)
Explanation
B is correct because the statement contains a critical error in its second clause: even when wearing a properly grounded ESD wrist strap, you must never directly touch the electric circuits on a board. The wrist strap equalizes electrostatic potential between you and the board, but direct contact with circuits still risks damage from skin oils, physical stress on components, and residual charge paths.
Why A is wrong: Although the ESD wrist strap requirement is accurate, the statement as a whole is false - a single false clause makes the entire compound statement false. Marking TRUE would endorse the dangerous practice of touching circuits directly.
Memory tip: Think of the ESD strap as your permission slip to be near the board, not a license to touch it. Always handle PCBs by their edges or use approved tools - the strap protects against static, not against physical or contamination damage from bare-hand circuit contact.
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