The Average traces in the Power and Spectrum menus are obtained as follows:
Let c be the number of bursts forming one statistics cycle (one statistic count) and assume that n bursts have been measured since the start of the measurement. In calculating the Average trace, the following two situations are distinguished:
| n £≤ c |
Single shot measurement or continuous measurement during the first statistics cycle: At each test point, Average trace no. n is calculated from Average trace no. n - 1 and Current trace no. n according to the following recurrence:
The Average trace represents the arithmetic mean value over all n bursts measured. |
| n > c | Continuous measurement after the first statistics cycle:
At each test point, Average trace no. n is calculated from Average
trace no. n - 1 and Current trace no. n according to:
|
Scalar quantities are averaged in analogy to Average traces. The formulas hold for n = 1 where the average trace becomes equal to the current trace (statistics off). Scalar quantities are averaged in analogy to Average traces
Note:
Some network tests (e.g. WCDMA) use a different prescription to calculate
the average traces. See the relevant manuals for more information.
