Press the Shift key then the Limit (6) key on the number keypad to display the Limit menu. The limit lines and Limit menu are not available in Distance‑to‑PIM measurements.
Changing Limit Line Settings
1. Press the Shift key and then the Limit (6) key.
2. Press the Limit (Upper / Lower) submenu key to select the desired limit line, Upper or Lower.
3. Activate the selected limit line by pressing the On Off submenu key so that On is underlined.
4. If necessary, press the Set Default Limit submenu key to redraw the limit line in view.
5. Press the Amplitude submenu key to set the Limit value.
6. Press the Limit Alarm submenu key to toggle the alarm setting On and Off. The current setting is underlined.
Limit Alarm and Pass Indicator
The upper limit must be On to use the Limit Alarm or the Pass Indicator.
The Limit Alarm is an audible alarm that emits a chirp each time a measurement trace exceeds an upper limit. If a measurement trace remains below the upper limit setting, then the measured values (instantaneous PIM) are displayed normally in the PIM Summary Table. If a measurement trace exceeds the upper limit setting at any time during a measurement, then the measured values are displayed in red numerals until the trace is below the upper limit setting. Although the instantaneous PIM values may be displayed in white numerals at the end of a measurement, if the measured PIM value exceeded the upper limit setting at any time during the measurement, then the Peak PIM values will remain displayed with red numerals when the measurement is complete. See Figure: PIM Summary Information for an example of this condition.
The Pass Indicator displays a visual message but has no audible sound. If a measurement trace remains below the upper limit setting, then the measured values are displayed normally. As the measurement is in progress, the word PASS is displayed in large green letters in the sweep window as long as the trace is within the limit. If a measurement trace exceeds the upper limit setting at any time during a measurement, then the measured values are displayed in red numerals, and the word FAIL is displayed in large red letters in the sweep window. The large PASS and FAIL display allows you to see this result on the display screen from a distance.
