A Technician Is Testing an Undocumented Digital System with a Signature

Multiple Choice

A technician is testing an undocumented digital system with a signature analyzer. What indications should the technician look for?

A) Without documented signatures, the instrument is basically useless.
B) Look for similar signatures that show up at different points in the circuit; no two points should be the same.
C) As signals flow from one circuit to another, changes will take place; look for changes in the signatures, especially between inputs and outputs.
D) Use a logic analyzer to verify the correct operation of the signature analyzer; once its accuracy has been confirmed, its indications can be relied upon for troubleshooting.