Rohde & Schwarz R&S UPP, User Manual

Page: 434 / 938

Instrument Functions
R&S
®
UPP
418 User Manual 1411.1055.32 ─ 10
"Exponential" Averaging is performed continuously and displayed. When the current
result is calculated, the previous measurements are taken into con-
sideration using a constant factor. The weighting of the current mea-
surement (n) and of the previous measurements (n-1) is determined
by the selectable average count (k); the displayed result of the nth
measurement (n ≥2) is derived using the following formula:
     
1
1 1
 

  
n AVG
k
k
n FFT
k
n AVG
"Normal" The specified number of FFT cycles is performed, the partial results
added together and then divided by this number. The result does not
appear until all "k" cycles have been completed.
Remote command:
SENSe[1]:FUNCtion:FFT:AVERage:MODE
on page 762
Avg Count
Used to enter the average count; only if averaging is activated.
With "normal averaging", the number entered here determines how many consecutive
FFTs are used for averaging.
With "exponential averaging", the number "k" entered here determines the extent to
which the previous measurements are taken into consideration in the result. The
weighting of the previous measurements is (k-1)/k.
If, for example, k = 20 is entered as the average count, the current analysis result is
weighted by 5
% and the previous measurements by 95 %.
Remote command:
SENSe[1]:FUNCtion:FFT:AVERage
on page 762
triggered
Triggered FFT
Selectable only with averaging switched off.
"deactivated" Untriggered FFT
"activated" Triggered FFT
The trigger condition is set in the Waveform menu.
Forces activation of the waveform in "Meas Mode" "Standard".
All triggers can be selected, including "Manual" (results in untriggered
operation and is therefore not recommended) and "Genburst"
A "Pretrigger" can be selected.
The parameter field "Autotrigger" at the end of the Waveform menu is
permanently disabled (view only) to ensure that data is only collected
when the trigger condition occurs.
Remote command:
SENSe[1]:FUNCtion:FFT:TRIGgered
on page 763
FFT Analysis