Rohde & Schwarz CMU 200 - Page 116

CMU
1100.4903.12 3.20 E-9
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:
),,1()(
1
)1(
1
)( cnnCurr
n
nAvg
n
n
nAvg K=+−
−
=
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:
)()(
1
)1(
1
)( cnnCurr
c
nAvg
c
c
nAvg >+−
−
=
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).
Note: Some network tests (e.g. WCDMA) use a different prescription to
calculate the average traces. See the relevant manuals for more
information.