Anritsu 於 2010 年宣布，他們發明並成功研發了可定位 PIM 故障問題的專利認證技術，命名為 Distance-to-PIM™ (DTP)。DTP 會顯示天線系統內發生 PIM 問題的位置，以及與天線系統外部 PIM 源之間的距離。對於改善從現場 PIM 測試接收的資訊品質而言，這是相當重大的進展。然而，定位天線外的外部 PIM 仍有個問題，雖然 DTP 可提供與已定位 PIM 源天線之間的距離，但無法提供角度。如果天線波束寬度為 120，PIM 可能在相距 DTP 所測量的距離處，位於沿著 120 所畫出弧形路線上的任何位置。
PIM Hunter is a patent-pending technology that allows a test technician to pinpoint the location of external PIM beyond the antenna. By walking along the arc of the DTP distance from the antenna with PIM Hunter technicians can pinpoint the source of the PIM typically within a few centimeters.
The PIM hunting process begins with an Anritsu PIM Master MW82119B to inject two high-power test signals into the system under test. The test signals broadcast through the site antenna, exciting any PIM sources in the RF path. These PIM sources behave like CW transmitters radiating the IM3 frequency in all directions. With the PIM Hunter test probe connected to a spectrum analyzer in burst detect mode (Spectrum Master MS2720T or BTS Master MT8220T) or in custom setting (Spectrum Master MS2712E/MS2713E, Site Master S332E/S362E, or Cell Master MT8212E/MT8213E) and an appropriate bandpass filter installed, technicians can “hunt” for these IM3 signal sources along the arc of the distance provided by the DTP measurement of the PIM Master MW82119B. When the probe tip comes in close proximity to a PIM source, the PIM value increases by as much as 30 dB, indicating the precise location of the PIM source. The Identifying Sources of External PIM white paper, found in the Library tab, provides more detail on the external PIM hunting process.