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Why does measurement data exhibit a discontinuity at 5 MHz or 15 MHz and how can the 4294A get rid of this phenomenon?

The 4294A extends its measurement frequency range up to 110 MHz by terminating each measurement terminal with 50 ohm in order to eliminate the resonance of test leads (including leads inside the 4294A).
The measurement discontinuity is caused by the change in termination impedance at 15 MHz when the ADAPTER is set to NONE or at 5 MHz when it is set to 1m or 2m. The measurement discontinuity can be removed by performing LOAD compensation.