When a measurement is being made, Measure is underlined on this submenu key, and the whole Test key is highlighted in red (as shown in Figure: Test Submenu Key Highlighted in Red).
Test Submenu Key Highlighted in Red
Also, during PIM vs. Time and Swept PIM measurements, RF ON is displayed in red in the PIM Summary Table (See Figure: PIM Summary Information).
Warning
Any time the LED on the PIM Master is lit there is RF energy on the PIM Test Port out or the Port 2 Out port. Make sure you follow all precautions given in this publication to avoid injury or equipment damage.