Determining a back drilling depth for a printed circuit board using a printed circuit board test coupon

A method, comprising:

• placing probe on a top surface of printed circuit board (PCB) test coupon;
• passing a current through the probe;
• determining a signal between a first test point on the top surface of the PCB test coupon and a second test point on the top surface of the PCB test coupon, the first test point being associated with a first via that extends from the top surface of the PCB to a first side of a conductor on a first layer of the PCB test coupon and the second test point being associated with a second via that extends from the top surface of the PCB test coupon to a second side of the conductor on the first layer of the PCB test coupon;
• and
• determining, based at least in part, on the signal between the first test point and the second test point, a back drilling depth associated with the first layer.

A method, comprising:

• placing a probe on a top surface of a printed circuit board (PCB) test coupon, the PCB test coupon being associated with a PCB;
• determining a back drilling depth for a via associated with a first layer of the PCB, the back drilling depth being determined by:
• passing a current through the probe;
• determining a strength of a signal between a first test point on the top surface of the PCB test coupon and a second test point on the top surface of the PCB test coupon, the first test point being associated with a first via that extends from the top surface of the PCB test coupon to a first side of a conductor on a first layer of the PCB test coupon and the second test point being associated with a second via that extends from the top surface of the PCB test coupon to a second side of the conductor on the first layer of the PCB test coupon;
• and
• identifying the back drilling depth by comparing the strength of the signal to a depth characterization table associated with the PCB;
• and
• back drilling the via associated with the first layer of the PCB to the back drilling depth.