Perform the normal DTF measurements required on a line. If Option 331 is installed, then these files will be in instrument memory and will be available to overlay onto subsequent Distance‑to‑PIM measurements. DTF traces provide useful information, such as the exact length of the line and the location of RF connectors on the line.
DTP/DTF Trace Overlay Example
1. Press Shift then Trace (5).
2. In the Trace menu, press Load DTF Trace. The displayed Recall menu allows you to select any saved DTF trace to load into memory.
3. Set the PIM Master measurement type to Distance‑to‑PIM by pressing Measurements > Distance‑to‑PIM.
4. Press Test.
In Figure: High resolution DTF Measurement Overlaid with DTP Measurement, the DTF trace selected was DTF‑RL, with a precision load installed at the end of the line. This measurement is conducted to reveal the Return Loss level of each of the RF connections in the line. Due to the higher resolution available with DTF traces, each RF connector in the line is clearly visible. In this case, the highest PIM source is clearly coming from the middle RF connector.
High resolution DTF Measurement Overlaid with DTP Measurement
