The U4324A flying lead probe is a Keysight probing solution provided for the U4301A PCIe Gen3 Protocol Analyzer module. Each Flying Lead probe consists of five cables on one end and a pod on the other end. Four of the five wires are used to capture a PCI Express differential signal. The fifth wire is provided for connecting the probe to an optional external reference clock on the DUT. The pod plugs into a U4301A PCIe3 Protocol Analyzer port. The four signal cables plug into a replaceable N5426A ZIF (Zero Insertion Force) tip which in turn gets soldered to a channel on the DUT. The reference clock cable requires a 3-pin header attached to the DUT reference clock output source. The 3-pin header is the same as that used for the optional external reference clock connection on the U4322A Mid Bus 3.0 probe. The U4301A PCIe3 Protocol Analyzer can accept up to 4 Flying Lead probes which can provide support for up to 16 channels unidirectional or 8 channels bidirectional (4 Flying Lead probes). A single Flying Lead probe can be mapped with the U4301A Protocol Analyzer to probe: x1 or x2 either unidirectional or bidirectional, or x4 unidirectional. Two (2) Flying Leads are required to support x4 bidirectional or x8 unidirectional. The Flying Lead probe supports PCI Express 2.5 Gb/s, 5.0 Gb/s and 8.0 Gb/s. Its operating range is 0 °C to +55 °C. Each Flying Lead p robe has a unique serial number for easy tracking.