Discussion
A logic probe is placed on the output of a gate and the display indicator is dim. A pulser is used on each of the input terminals, but the output indication does not change. What is wrong?
Answer: B
Correct answer: The output of the gate appears to be open.
A logic probe shows a dim indication when the node is neither HIGH nor LOW but floating, and a floating node does not respond to pulses on the inputs because it is not connected to the gate's output at all. A bad ground would affect the probe's reading everywhere, not just here, and a tristate output would be driven when enabled.
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