Concepts and features
R&S
®
ZNA
199User Manual 1178.6462.02 ─ 20
SMARTerCal Type Based on ... Manual calibration Calibration unit
PTNA TNA
☑ ☐
P-Adapter Removal Adapter Removal
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The selection criteria for the SMARTerCal calibration types are identical to the criteria
for system error corrections. For an overview, refer to Chapter 4.5.1, "Calibration
types", on page 160.
4.5.7.3 Combining SMARTerCal with scalar power calibration
As described in Chapter 4.5.7, "SMARTerCal", on page 197, the power meter results of
a SMARTerCal are only used to calibrate the receivers of the R&S ZNA. To obtain defi-
nite source power levels, you can combine the SMARTerCal with an additional scalar
source power calibration.
The scalar source power calibration and the SMARTerCal can be performed in any
order. As a result of the combined calibration, the R&S ZNA measures vector error-cor-
rected S-parameters; the scalar power correction is applied to wave quantities and
ratios. Notice that this provides different values, e.g., of S
21
and the ratio b
2
/a
1
. The flat-
ness calibration step of the scalar source calibration ensures accurate input powers at
the DUT.
A combined SMARTerCal and scalar power calibration is also appropriate for fre-
quency conversion measurements on non-linear DUTs. For linear measurements,
where the actual input power at the DUT is not critical, a SMARTerCal is sufficient.
4.5.7.4 Calibration labels
The status and type of the SMARTerCal is indicated in the trace list, in analogy to a
system error correction (see Chapter 4.5.4, "Calibration labels", on page 178). The cal-
ibration labels for a SMARTerCal consist of a prefix "S" plus the system error correction
labels.
Table 4-16: Calibration labels (SMARTerCal)
Label Meaning
SCal The SMARTer Cal is applied without interpolation. This means that a set of measured
correction data is available at each sweep point.
SCal int The SMARTer Cal is applied, however, the correction data for at least one sweep
point is interpolated from the measured values. This means that the channel settings
have been changed so that a current sweep point is different from the calibrated
sweep points. It is not possible to disable interpolation.
Cal Off The SMARTer Cal is no longer applied (e.g. "User Cal Active" is disabled). See also
"Cal Off label" on page 160.
Calibration
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