R&S ZNB Series User Manual page 576

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R&S ZNB/ZNBT
It is essential to perform the calibration with the same "Frequency Offset" settings as
for the actual measurement; otherwise the calibration is deactivated ("Cal Off"). If there
is a mismatch, the
Parallel Measurement with Frequency Offset
Enables/disables a frequency offset in parallel measurements.
For segmented sweeps, the parallel measurements are performed segment per seg-
ment. If the
different measurement bandwidths, then the resulting frequency offsets are also differ-
ent.
Note: If both "Parallel Measurement with Frequency Offset" and
active, automatic switches between small and large IF gain during the sweep can lead
to visible steps in the measurement results. Select a fixed AGC mode ("Low Dist" or
"Low Noise") to suppress this effect.
Remote command:
SOURce<Ch>:GROup<Grp>:SIMultaneous:FOFFset:STATe
Minimum Offset
The "Minimum Offset" can be specified either as an absolute value ("Direct Value") or
as a multiple of the measurement bandwidth ("Bandwidth Factor").
Remote command:
SOURce<Ch>:GROup<Grp>:SIMultaneous:FOFFset:MOFFset:MODE
SOURce<Ch>:GROup<Grp>:SIMultaneous:FOFFset:MOFFset:DVALue
SOURce<Ch>:GROup<Grp>:SIMultaneous:FOFFset:MOFFset:BWFactor
State indication warning
When attempting to activate the "Parallel Measurement with Frequency Offset" (i.e. on
closing the "Define Parallel Measurement" dialog with the "OK" button), the VNA Firm-
ware checks whether the requested settings are technically feasible. If not, the firm-
ware disables parallel measurement (i.e. the measurements are performed one after
the other) and generates a warning message indicating the current configuration prob-
lem.
In particular, activation is rejected if:
●
the start frequency is < 31 MHz
●
the measurement bandwidth is > 100 kHz
●
the resulting frequency offset (i.e. the minimum frequency offset, rounded to a mul-
tiple of the current frequency step size) would be too high
●
the port groups are configured with different frequency conversion settings
User Manual 1173.9163.02 ─ 62
Calibration Manager dialog
Minimum Offset is specified as a "Bandwidth Factor" and the segments use
Channel Config softtool
provides additional information.
AGC Mode
GUI reference
"Auto" is
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