This is a screen shot of the Passive IM Analyzer software running in Swept Frequency Mode

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In Swept Frequency Mode the high-power carriers are swept across the transmit band in such a way that their IM products fall within the receive band. For speed and efficiency only those pairs of transmit frequencies which create IM products in the recieve band are swept.

A unique feature is the use of dual-carrier sweeps: the high-frequency carrier is first swept toward the stationary low-frequency carrier then the low-frequency carrier is swept up toward the stationary high-frequency carrier. As can be seen from this plot, sometimes these two measurements yield different results.

  Swept Frequency Mode printed output example