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The Keysight (formerly Agilent) 85037B precision detector is designed specifically for operation with the 8757D scalar network analyzer and may be used in either ac or dc detection modes. This dual diode detector contains internal frequency correction factors in an internal EE PROM (read automatically by the 8757D) for improved measurement accuracy versus frequency. When used in conjunction with the 8757D's internal power calibrator (Opt 002), these detectors provide the maximum absolute power measurement accuracy. The 85037B is not compatible with the 8757E, 8757A, 8756A, or 8755.