Quickly test your Receiver Design to the PCIe 3.0 Base Specification Description GRL’s PCI Express®3.0 Base Specification Receiver Calibration and Test Automation Software for the Tektronix BERTScope™ BSA (GRL-PCIE3-BASE-RX) provides an automated, simple, and efficient way to test your PCIe 3.0 Receiver to the Base (ASIC) Specification.