Spectrum Analyzer Menus
6–30
2715 User Manual
The factory default setting is a 16-sweep fixed average. Do the following steps to
change the number of averages to 24:
21. Press [7] from the Ensemble Averaging menu.
22. Press [2] [4] [W].
Item 7 will update as you press [W].
You are now ready to compile a parameter average. There are four choices. Begin
with the max/min display.
23. Press [6] MAX/MIN from the Ensemble Averaging menu.
The asterisk moves down to indicate MAX/MIN is selected.
24. Press [1] to start averaging.
The spectral display reappears and both status indicators for register A light.
At the bottom of the right-hand readout column, the number of sweeps
averaged is displayed (displayed only when the 2715 is in the non-CATV
mode). When all 24 sweeps have been included in the average, the readout
stops indicating the number unless the A register is the only one turned on.
25. Turn the D register on and off several times and note the difference.
Most of the sweep-to-sweep variations in the noise have disappeared.
Now we will repeat the experiment, this time storing the MAX average in
register B. In this case, only the 256 maximum values of each max/min sweep
are averaged and stored.
26. Press [DSPL] [1] [3] to select MAX.
27. Press [8] repeatedly to select register B.
28. Press [1] to start the averaging process.
Both status indicators for register B light, the average peak value almost
coincides with the upper edge of the MAX/MIN average.
29. Turn off the A register to see the average maximum by itself.
30. Turn the A register back on.
31. To store the MIN average in register C, press [DSPL] [1] [5] [8].
32. Press [1] from the ENSEMBLE AVERAGING submenu to start averaging.
Both status indicators for register C light. Here, too, we see that the average
minimum coincides closely with the lower edge of the MAX/MIN average.
In computing the average MIN, the 256 minimum points from each max/min
sweep are used.
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