ABSTRACT: This is the user guide of the Maury Microwave precision N 75 Ohm coaxial calibration kit for models 8880CK40/41. This series of Precision N 75 Ohm coaxial calibration kits is designed to provide accurate calibrations of network analyzers in the DC to 18.0 GHz range. However, these kits can be used at higher frequencies. Each of these kits includes all the necessary calibration standards and associated hardware needed for the accurate calibration of most network analyzers.