When necessary, calibrate the PIM Master. Refer to section Calibrating.

A good practice is performing a DTP measurement after the calibration in order to verify that measurements appear normal after the calibration. Figure: DTP Measurement of PIM Standard and Termination after Calibration represents a typical Distance‑to‑PIM measurement of a PIM standard and a low PIM termination right after calibration. Figure: DTP Measurement of PIM Standard and Termination after Calibration is another measurement of the same PIM standard and PIM termination, but from 0 feet to 100 feet. Note that a normal calibration can look very different when the measurement distance is changed.

 

Figure: Typical DTP Measurement After a Calibration represents a typical Distance‑to‑PIM measurement of a connected load (the Low PIM Termination) right after calibration. Figure: Typical DTP Measurement After a Calibration shows another measurement of the same load with a different distance setting. Note the differences in these two traces of the same load when measured with different distance settings.

Distance: 0 ft to 30 ft.

 

Distance: 0 ft to 100 ft