R&S ZNB Series User Manual page 97

®
R&S ZNB/ZNBT
stop power smaller than the start power is set, then the start power is adjusted
automatically and vice versa.
The power corresponds to the actual source power at the test ports (channel base
power P
brated reference plane.
●
"CW Mode"
The stimulus hardkeys define the fixed stimulus frequency ("CW Frequency") and
the "Number of Points" of the measurement. The other sweep parameters (e.g. the
"Sweep Time") are set via Channel – [Sweep] > "Sweep Params".
●
"Time"
The stimulus hardkeys define the fixed stimulus frequency ("CW Frequency") and
the total sweep time ("Stop Time") of the measurement. The other sweep parame-
ters (e.g. the "Number of Points") are set via Channel – [Sweep] > "Sweep Par-
ams".
The sweep time is entered in seconds and must be positive.
The selected sweep range applies to all source and receive ports of the analyzer.
In arbitrary mode (with option R&S ZNB/ZNBT-K4), you can define port-specific fre-
quencies and powers; see
4.1.4.5 Stepped vs. swept mode
The R&S ZNB/ZNBT provides two sweep modes: stepped mode and swept mode.
In stepped mode (default), the frequency is changed stepwise and sampling is per-
formed at a tuned frequency for each measurement point. In swept mode, on the other
hand, sampling is performed with the frequency always swept for each measurement
point. Since in stepped mode at each measurement point a certain time is required
until the frequency becomes stable, sweeps in swept mode are generally much faster
than in stepped mode - at the cost of a lower measurement precision.
f
stop
f
start
Apart from the loss in precision there can be other technical reasons that prevent the
swept mode from being advantageous. For instance if the sweep is triggered by events
caused by external devices such as part handlers, generators or power meters, the
User Manual 1173.9163.02 ─ 62
). After a port power calibration, this source power is available at the cali-
b
Chapter 5.12.2.2, "Port Settings
Stepped Mode
Sampling
...
f
1 2 3 ...
measurement points
f
f
stop
f
start
n 1
Concepts and features
Basic concepts
dialog", on page 562.
Swept Mode
Sampling
...
2 3 ...
measurement points
n
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