Agilent Technologies 8510 - Manual (Page 27)

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Female type-N Male type-N
7 mm Coaxial connector
Type-N coaxial connector interface
The location of the “calibration plane” in Type-N standards is the outer conductor mating surfaces as shown below.
Note: 1.0mm, 1.85mm and 2.4mm connectors not shown, but similar to 3.5mm calibration planes.