| 摘要 |
One disclosed method is to automate testing for transmission path impedance conditions on a circuit board. The method can include transmitting a plurality of electrical pulses on a transmission path utilizing an on-board transmitter, the electrical pulses can have a time period and the transmission path can have impedance mismatches to reflect energy of the electrical pulse back towards the on-board transmitter. After the pulse is transmitted, a voltage of the reflected energy can be compared with a reference voltage at different time intervals. A single bit can be acquired for each voltage/time sample and the bits can be sequentially stored in a shift register. The digital data that is stored in the shift register can be compared to existing data in memory to determine a quality of the transmission path of the printed circuit board.
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