Rohde & Schwarz ZNB20, Руководство пользователя

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GUI Reference
R&S
®
ZNB/ZNBT
236 User Manual 1173.9163.02 ─ 38
(Virtual) Hardkey Keyboard Shortcut Related Softtool Action
SYSTEM – APPLIC Alt + Shift + N Applic Softtool default
SYSTEM – DISPLAY Alt + Shift + S Display Softtool default
SYSTEM – SETUP Alt + Shift + T Setup Softtool default
SYSTEM –
WINDOWS
®
Windows key none n.a.
SYSTEM – HELP F1 none n.a.
SYSTEM – PRESET Alt + Shift + U none n.a.
SYSTEM – UNDO Alt + Shift + V none n.a.
SYSTEM – REDO Alt + Shift + I none n.a.
5.2 Power Bw Avg Softtool
The "Power Bw Avg" softtool allows to define the power of the internal signal source(s),
to set the step attenuators and the IF bandwidths, and to configure the sweep average.
Access: CHANNEL – POWER BW AVG hardkey
5.2.1 Power Tab
The "Power" tab allows to define the power of the internal signal source(s). It is identi-
cal to the "Stimulus" > "Power" tab; see
Chapter 5.8.2, "Power Tab" , on page 432.
5.2.2 Bandwidth Tab
Sets the measurement bandwidth and the shape of the IF filter. The settings apply to
all filters in the active channel. A system error correction (calibration) remains valid
when the filter settings are changed.
Optimizing the filter settings
A high selectivity and a small filter bandwidth both suppress the noise level around the
measurement frequency and thus increase the dynamic range. On the other hand the
time needed to acquire a single measurement point increases with smaller filter band-
widths and high selectivity. For small bandwidths, the filter settling time, which is inver-
sely proportional to the bandwidth, is responsible for the predominant part of the mea-
surement time.
The characteristics of the high selectivity filter makes it particularly suitable for isolating
unexpected spurious responses or known mixer products.
Power Bw Avg Softtool