PIM Master™ Passive Intermodulation Analyzer User Guide : PIM Analyzer : Making the PIM Measurement
Making the PIM Measurement
1. Press the Measurements main menu key. The Measurements menu is displayed.
2. Begin testing by pressing the Test submenu key, On is underlined while the test signal is being transmitted. Two high‑power test signals are transmitted from the PIM Master Test Port to the DUT. PIM distortion is returned through the PIM Master to the Anritsu handheld instrument. The results are displayed on screen in either spectrum view or bar graph. The RF‑On light on the PIM Master front panel illuminates during the PIM test. Test duration is specified under the Setup main menu. You can terminate the test early by pressing the Test submenu key so that Off is underlined.
Attempting to make a PIM measurement when the intermod product is out of the filter range of the instrument causes display of the error message shown in Figure: display with IM Range Error Attention Message and shown larger in Figure: Attention Message for IM Range Error.
Notice the instrument settings summary on the left side of the sweep window. The IMD 5(–) is at 1,810 MHz and is outside of the listed filter ranges.
Either change the frequency values for F1 and F2, or change the IMD order (3rd, 5th, or 7th) under the Frequency main menu so that the IM product of F1 and F2 is in the frequency filter bands of the instrument.
Press Esc to clear the message.
display with IM Range Error Attention Message
Attention Message for IM Range Error
3. Save the current measurement by pressing the Save Measurement submenu key. The Save dialog box opens.
4. Type a name for the measurement to be saved and press Enter. Refer to the Anritsu handheld instrument User Guide for additional information.
Measure Noise Floor
Use this submenu key to check for external transmitted signals that may affect the PIM receiver with no PIM RF output enabled. Press the PIM submenu key, then press the Measure Noise Floor submenu key. If an external signal is present, then try changing F1 or F2 carrier frequencies to place the 3rd order product at a frequency that is not affected by off‑air signals. Any signal that is present should be investigated.