Before performing a Noise Floor measurement, the PIM Master must be calibrated. If you are performing a Noise Floor Time View calibration, refer to Calibrating the PIM Analyzer). If you are performing a Noise Floor Spectrum View measurement, a separate calibration is required. Press the Start Cal Spectrum View button in the Noise Floor menu, and then follow the on‑screen instructions to calibrate the Spectrum View.
Setup is the same as the PIM vs. Time setup, which is described in PIM versus Time. If you have already set up the PIM Master for a PIM vs. Time measurement and performed a calibration, then skip to Step 3.
1. Turn on the PIM Master.
2. Press the Measurements main menu key and then press the PIM vs. TIME submenu key.
3. Press the Freq main menu key.
4. Set the frequencies of Carrier F1 and Carrier F2.
5. Press the Intermod Order submenu key so that the desired intermodulation frequency order to be viewed is underlined. 3rd order is the most commonly chosen measurement .
Note
The PIM Parameters screen (press the PIM Aid submenu key) displays the IM frequencies. Output Power can be ignored for the Noise Floor measurement.
6. Press the Setup main menu key and then press the Test Duration submenu key to set a time from 1 second to 1200 seconds.
7. To set a limit, press the Shift and Limit (6) keys.
8. In the Limit menu, press the Limit key to choose Upper or Lower limit. You can then press the Set Default Limit submenu key or the Amplitude submenu key to set a limit value. Only the upper limit line has alarm and pass indicator functions.
9. Press the Limit Alarm submenu key to turn On the audible alarm.
10. Press the Pass Indicator submenu key to turn On the PASS / FAIL indication.