PCB Reverse Engineering Propagation Velocity Test Coupon General Guidelines

PCB Reverse Engineering Propagation Velocity Test Coupon General Guidelines will help engineer to figure out more effective and efficient way to extract layout drawing, Gerber file and Schematic diagram from original printed circuit board;

Measurement of velocity or propagation delay of Reverse Engineering PCB Card is, in general, more difficult than measuring impedance.

For velocity, the structure delay is determined by measuring the difference in time it takes the pulse to propagate through the structure by following PCB Reverse Engineering rule. Measurement points for propagation delay are not as simple as for impedance and accuracy is extremely dependent upon the probing technique.

The most accurate delay measurements require advanced probing techniques utilizing controlled impedance microprobes with the TDR in Time Domain Transmission (TDT) mode. This improved accuracy comes at a cost in terms of equipment and measurement time. Selecting the method for measuring the velocity depends on accuracy desired, measurement test time and cost.

The simplest but least accurate method for measuring propagation delay is using TDR mode to measure delay between two identical test structures of different length after PCB Reverse Engineering. Propagation delay can then be calculated by dividing the different structure delay differences by the difference in length.

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