Reverse Engineering Multilayer PCB Card will encounter the difficulty of invisiable wires buried in the inner layer, even though most of the wires among inner layers are all used for grounding and power supply and play as the isolation sheet, but it is still critical for the success of PCB Reverse engineering;
For invisible lines, most of them are detection devices to detect unknown lines. The simplest detection method is to hit the multimeter into the “short-circuit buzzer” file, measure the connection between the pins by two pairs of test leads, and then manually record the reference. The condition of the on and off road between the feet.
The premise of automatic measurement is to connect the pin of the device under test into the detection circuit. For this purpose, several measuring heads are set up by the detecting device, which can be connected by cable. The measuring head can be connected with the test fixture and the component pins. The number of measuring heads is established. Determine the number of pins connected to the detection circuit in the same batch, and then under the control of the program, the detectors will be connected to the measured “pin pairs” one by one according to the combination principle.
The PCB path detection circuit board built on this idea should implement three functions:
1. Automatically select the measured “pin pair” and measure it;
2. Automatically judge the path relationship between “pin pairs”; 3. Automatically record measurement results;
