Tektronix SPECMON3 Manual page 353

Marker Measurements
1. Select Markers > Define to display the Markers control panel.
2. Click Add. The first marker defined is always designated the Marker Reference. Subsequently defined
markers are designated as Delta Markers (you can also select and adjust markers by clicking on an
existing marker in the display).
3. Click Add again so that there are at least two markers defined.
4. Check that Readouts is set to Delta.
5. If you have more than one trace defined, use the drop-down list for each marker to set it to the trace
on which you want to measure noise.
6. Select the Settings button to display the Spectrum settings control panel.
7. Click the Prefs tab.
8. Click the Marker Noise Mode check box so it is checked.
9. Click the Traces tab.
10. Verify that Detection is set to Average for the trace you are using for this measurement.
11. Click the (Analysis) icon.
12. Select the Units tab.
13. Select dBm for the Amplitude units.
14. Click the Close button to remove the control panel.
15. Move the markers to the desired locations on the trace.
16. Read the frequency and power level for the selected marker in the upper corners of the display. To
display the delta measurement in dBc/Hz, select the delta marker (M1, M2, M3 or M4) by clicking
on it or pressing the front-panel Select button until it is selected.
SPECMON3 & SPECMON6 Printable Help
Using Noise Markers in the Spectrum Display
341