Device and method for checking signal transmission quality of circuit board

A method for checking signal transmission quality of a circuit board, comprising steps of:

• outputting a source signal from a first device to a second device via a trace on said circuit board;
• adopting said source signal transmitted through said trace as a test signal;
• comparing said test signal with a first reference signal at a plurality of tome points, and accumulatively counting to obtain a first counted value whenever the comparison result complies with a first predetermined result;
• and
• determining the signal transmission quality of said circuit board according to said first counted value.

A device for checking signal transmission quality of a circuit board, said circuit board communicating a source device and a destination device via a trace, and said device for checking signal transmission quality being arranged in said source device and comprising:

• a first comparator electrically connected to said trace, and generating a first counting signal in response to a first comparison result of a test signal transmitted through said trace with a first reference signal;
• a first counter electrically connected to said first comparator, and counting in response to said first counting signal to generate a first accumulatively counted value;
• and
• a discriminator determining the signal transmission quality of said circuit board according to accumulatively counted value.