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X-ray FELs deliver rapid pulses on the femtoseconds scale, and high peak intensities that fluctuate strongly on a pulse-to-pulse basis. The fast drift velocity, and high radiation tolerance properties of CVD (chemical vapor deposition) diamonds, make these crystals a good candi-date material for developing a multi-hundred MHz pass-through diagnostic for the next generation of XFELs. Commercially available diamond sensors work as posi-tion-sensitive pass-through diagnostics for nJ-level pulses from synchrotrons. Supported by the University of Cali-fornia and the SLAC National Laboratory, a collaboration of UC campuses and National Laboratories have devel-oped a new approach to the readout of diamond diagnostic sensors designed to facilitate operation for FEL-relevant uJ and mJ pulses. Single-crystal diamond detectors have been tested on the XPP end station of the Linac Coherent Light Source beam at SLAC. We present results on the linearity and charge collection characteristics as a function of the density of deposited charge., Proceedings of the 10th International Beam Instrumentation Conference, IBIC2021, Pohang, Rep. of Korea