GUI reference
R&S
®
ZNB/ZNBT
578
User Manual 1173.9163.02 ─ 62
This mode is usually faster than "Chopped" mode.
●
In "Block Alternated" mode, you can split the sweep range into several blocks of
sweep points. The measurement then proceeds block per block, using the "Alterna-
ted" driving mode for each block.
●
In "Chopped" mode, the analyzer completes the necessary sequence of partial
measurements at each sweep point and obtains the result (measurement point)
before proceeding to the next sweep point. A trace is obtained from the beginning
of the sweep.
The "Driving Mode" setting is also used during a system error correction. For channels
which require a single partial measurement only, the driving mode settings are equiva-
lent. See also
Chapter 4.1.4.1, "Partial measurements and driving mode"
Remote command:
Number of Alternated Blocks
Defines the number of blocks for the "Block Alternated"
If "Number of Alternated Blocks" is set to 1, "Block Alternated" is equivalent to "Alterna-
ted" mode. If it is set to the
, "Block Alternated" is equivalent to
"Chopped" mode. By selecting a suitable
, you can minimize the total
sweep duration.
Note:
●
If the number of sweep points is not divisible by the number of blocks, the first
block is extended by the excessive number sweep points.
●
For segmented sweeps, the "Block Alternated"/"Number of Alternated Blocks" logic
is applied to the individual sweep segments.
Remote command:
[SENSe<Ch>:]COUPle BLOCk, <Number of Alternated Blocks>
Image Suppr.
The "Image Suppr." settings define whether the analyzer measures with a local oscilla-
tor frequency LO below or above the RF input frequency. This feature can be used to
eliminate known spurious components in the input signal that can distort the measure-
ment, especially in the low frequency range.
●
In "Auto" mode, the analyzer auto-selects the LO frequency, depending on the
receiver (RF) frequency and the test port. This mode systematically avoids known
spurious signals if no frequency conversion occurs in the test setup.
●
"LO < RF" means that the LO frequency is always below the measured RF fre-
quency. This mode is appropriate for avoiding single, known spurious signals.
●
"LO > RF" means that the LO frequency is always above the measured RF fre-
quency. This mode is appropriate for avoiding single, known spurious signals.
Tip:
In the presence of several spurious signals, setting the "Image Suppr." parameter
globally can be insufficient. To improve the result, perform a segmented frequency
sweep and assign independent LO frequencies to the individual sweep segments.
Application example
Channel Config softtool
