The main menu keys and submenu keys for Distance‑to‑PIM analysis differ from the PIM versus Time menus as described in PIM versus Time. For a description of the key functions in the Distance‑to‑PIM menus, refer to section Menu Map 1.
1. Press the Measurements main menu key to display the Measurements menu.
2. Press the Distance‑to‑PIM submenu key.
3. Press the Distance main menu key.
Note
The DTP Analyzer includes several menus with buttons for setting up measurement parameters. All of these parameter settings are also available in one convenient location in the DTP Parameters window, which is opened by pressing the DTP Aid submenu key.
4. Press the DTP Aid submenu key to set up the DTP measurement parameters. The DTP Parameters setup window is displayed, and the DTP Aid menu is displayed.
DTP Parameters Window
5. From the DTP Aid menu, press the Units submenu key to display the Units submenu. Press the Meters or Feet submenu key to select the desired units to be used in the measurement. The menu display returns to the DTP Aid menu.
6. Highlight one of the distance values. Use the number keypad to set the Start and Stop distances.
The Stop Distance needs to be smaller than Dmax. Dmax is the maximum horizontal distance that can be analyzed, and it is displayed next to the Stop Distance value. Because the Stop Distance cannot exceed Dmax, if the cable is longer than Dmax, then Dmax needs to be improved by increasing the number of data points. Dmax is also affected by the cable propagation velocity.
Note that the number of data points can be set to either 128 points or 255 points. The number of data points should always be set to the maximum amount of steps available, with respect to the F2 swept bandwidth. When the start and stop distances have been set, the menu display returns to the DTP Aid menu.
7. Highlight (or touch) the Data Points button to open the Resolution menu. Select the number of data points that best fits the measurement: 128 points or 255 points.
8. Highlight (or touch) the Cable button to display the available cable specifications. Use the Cable List submenu keys along with the Arrow keys to navigate to the desired cable specification, and then press Enter (or press the Esc key to abort without selecting a cable).
Note
When a cable is selected from this list, propagation velocity and cable loss are automatically set by the instrument.
9. If the Cable selection is “None”, then, for the cable in use, enter an applicable Propagation Velocity. Entering a Cable Loss value is optional because this variable is not currently used by the PIM Master software for PIM fault distance analysis.
10. Highlight (or touch) the Output Power button to set an appropriate power level and press Enter.
11. Press the Continue button. If changes have been made to parameters that affect calibration, then a Calibration OFF indication will appear on the screen. Proceed to Calibrating to initiate a calibration prior to performing a DTP analysis. Otherwise, continue at Step 12.
If you press the Back submenu key from the Calibration menu, then the display returns to the Distance menu (or to the menu that was being displayed before you began calibration).
12. Press the More submenu key to open the DTP Setup menu. More is found in the Distance menu. After pressing More, the DTP Setup menu is displayed, allowing you to get cable parameters or to set windowing.
13. Press the Window submenu key to open the Windowing menu. Select the desired windowing format by pressing one of the four submenu keys: Rectangular, Nominal Side Lobe, Low Side Lobe, or Minimum Side Lobe. Refer to Windowing.
14. If necessary, calibrate the PIM Master. Refer to section Calibrating.
Note
During calibration, RF is On, but the RF ON message is not displayed. The CALIBRATION IN PROCESS... message is displayed in red letters on the measurement screen.
15. Press the Measurements main menu key. Then press the Test submenu key to begin your measurement.
Caution
Make sure that you a have attached a test lead to the instrument and that it is attached to the system under test before pressing the test button.
If you need to terminate the measurement before the allotted Test Duration time is complete, then you can press the Test submenu key to turn off the measurement. Also, RF power can be immediately turned off with the Emergency Stop button on the PIM Master (item 3 in Figure: PIM Master Connection Diagram – Top).
