Spectrum Master™ User Guide : Initial Startup : Setting Up Limit Lines
 
Setting Up Limit Lines
Press the Shift key then the Limit (6) key on the numeric keypad to display the Limit menu.
Simple Limit Line
Spectrum Analyzer and Interference Analysis Modes
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. Press the Limit Move submenu key to display the Limit Move menu. Press the Move Limit submenu key to change the dBm level of the limit line.
5. Press the Back submenu key to return to the Limit menu.
6. If necessary, press the Set Default Limit submenu key to redraw the limit line in view.
Limit Line Envelope
Spectrum Analyzer and Interference Analysis Modes
Using Limit Envelope:
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. Press the Limit Envelope submenu key to display the Limit Envelope menu.
4. Press the Create Envelope submenu key to create an envelope around the measurement.
5. Press Upper Points or Lower Points submenu key to change the number of segments in the envelope.
6. Press the Upper Shape or Lower Shape submenu key to toggle between square and sloped limit envelope.
7. Adjust the Upper or Lower Offset to move the limit line closer to (a smaller value) or further away from the trace.
Complex Limit Lines
Spectrum Analyzer and Interference Analysis Modes
Figure: Complex Limit Line Example shows an example of a complex limit line.
Complex Limit Line Example
When building some complex limit lines, you can create either the right or left half of the limit line and then build the remainder by pressing the Limit Advanced submenu key and then pressing the Limit Mirror submenu key. The complete set of Limit menus is described in the Spectrum Analyzer Measurement Guide (refer to Related Documents).