Rohde & Schwarz R&S UPP, Руководство пользователя

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Instrument Functions
R&S
®
UPP
457 User Manual 1411.1055.32 ─ 10
"RMS" A broadband RMS measurement is performed which – with the fre-
quency measurement switched on – uses automatic period detection.
(The measurement method in this case corresponds to the "RMS
measurement function " in the "Meas Time Auto mode "). With weak
signals, measurement is performed over a fixed period of 100
ms.
Any superimposed DC components are also measured, but (in the
analog analyzer) are suppressed by the system hardware if the AC
coupling is activated.
Note: In the case of multitone signals without dominant components,
period detection cannot deliver reliable results; in this case, the RMS
result exhibits slightly larger fluctuations.
"DC" A DC voltage measurement with automatic AC suppression is per-
formed. With weak signals, measurement is performed over a fixed
period of 100
ms.
In the analog analyzer, DC coupling should be selected for this mea-
surement mode because the DC component of the measurement sig-
nal is filtered out with AC coupling. A suitable warning will be dis-
played if the coupling is switched to AC with DC measurement
enabled, or if the mode is switched to DC measurement with AC cou-
pling selected; however, the measurement is performed.
Note: In the case of multitone signals without dominant components,
AC period detection cannot deliver reliable results; in this case, the
DC result exhibits slightly larger fluctuations.
"Peak"
A measurement of the input peak value is performed. The numerically
highest input same is determined within a predefined time interval
that is also obtained from the period length of the measurement sig-
nal. With weak signals, measurement is performed over a fixed
period of 100
ms.
Note: In contrast to peak measurement, which – like all measuring
functions – takes place downstream of the filters, no interpolation fil-
ter (oversampling filter) is used.
Remote command:
SENSe6:FUNCtion OFF | LRMS | DC | PEAK
5.37 Second Monitor
The Second Monitor provides the same selection of functions (RMS, DC or PEAK) as
the Level Monitor or the Input Monitor (see
Chapter 5.36, "Level Monitor" , on page 456
and Chapter 5.35, "Input Monitor" , on page 455). Thus, two different levels (chosen
from RMS, DC or PEAK) in addition to the Function Result (e.g. SINAD) and Fre-
quency can be displayed simultaneously.
2nd Monitor
Switching on Second Monitor and selection of measurement function.
Second Monitor