Rohde & Schwarz R&S UPP, User Manual

Page: 454 / 938

Instrument Functions
R&S
®
UPP
438 User Manual 1411.1055.32 ─ 10
●
The "Filter" and "Equalizer" should not be used unless absolutely necessary. If a
filter or filters are used, it must be borne in mind that the settling of the filter will be
visible in the waveform trace, since in this case the start of the measurement can-
not be delayed by the filter settling time as is otherwise usual.
●
For "analog measurements", the Autoranger must be switched off (Range Fix for
the measurement channels used), and the input coupling must be set to DC. A
range that is large enough to acquire the expected signal level without overranging
must be selected. For very long delays (> 2
s), the bandwidth must be reduced.
●
With "pure analog measurements" (analog generator and analog analyzer), the
generator and analyzer should be configured with the same bandwidth. With "D/A
measurements", it is recommended that you adapt the generator bandwidth to the
analyzer sampling rate (i.e. 22
kHz bandwidth for 48 kHz sampling rate, 40 kHz
bandwidth for 96 kHz sampling rate, 80 kHz bandwidth for 192 kHz sampling rate).
●
For evaluation of the measurement, the "waveform window" must be visible and a
vertical graphic cursor (or two cursors for two
‑
channel measurements) must be
enabled ("Movement Next Sample"). With a two-channel measurement, this allows
the relative delay of the two measurement signals to be read in addition to the
absolute delay of each signal.
The x-axis should initially be scaled automatically so that the entire waveform trace
can be seen. The graphic zoom function can then be used for more precise exami-
nation of the signal start.
●
A "measurement function" with a short measurement time (e.g. FFT with an FFT
size of 1
k) should be selected in the "Analyzer Function panel", and all unneces-
sary supplementary measurement functions (especially frequency and level moni-
toring) should be disabled. The Waveform Monitor must be enabled.
●
"Meas Mode Standard" should be selected in the "Waveform menu" (Analyzer
Function panel); it is not necessary to select "Undersample" except for very long
delays (> 9
s). "Trigger Source" must be set to "Gen Burst".
Analysis in the Time Domain