Rohde & Schwarz FPC Series - 12 Calibration

Calibration
R&S
®
FPC
54User Manual 1178.4130.02 ─ 07
12 Calibration
Access: "Meas" > "Source" > "Normalization"
Remote commands to calibrate measurements:
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not supported
Available for the R&S FPC1500 and in the spectrum and VNA applications.
Before you measure S-parameters, you should calibrate the measurement. Calibration
or system error correction is a separate measurement that determines systematic,
reproducible errors. Determining these errors allows you to remove those errors from
the actual measurement results, which in turn improves the accuracy of the measure-
ment.
The calibration requires a calibration standard (or calibration kit), whose response
characteristics (magnitude, phase and frequency) are known. During calibration, the
R&S FPC compares the measurement results of the standards with their known, ideal
response. The difference is used to calculate the system errors and derive a set of sys-
tem error correction data.
For successful and valid calibration, you connect the calibration standard at the refer-
ence plane. The reference plane is usually the output of the RF measurement cable.
Calibration remains valid after turning off the R&S FPC or changing into another appli-
cation as calibration data is saved in the internal memory of the R&S FPC. If you save
the measurement in a dataset, calibration data is part of that dataset. When you
restore the dataset and repeat the same measurement, you do not have to recalibrate
the R&S FPC.
Before you calibrate the R&S FPC for the current measurement, you should set the fre-
quency parameters, reference level and attenuation levels. If you change one of these
parameters after a successful calibration, it can become invalid.
Calibration states
The R&S FPC can have one of several calibration states as indicated in the trace infor-
mation of the diagram header. The possible states depend on the calibration type.
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"(dcal)"
The R&S FPC uses default calibration. For details, see "Performing a default cali-
bration" on page 56.
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"(uncal)"
The measurement is not calibrated. The uncorrected measurement results are dis-
played.
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"(norm)"
The measurement has been calibrated with the normalization calibration type.
Measurement results are corrected accordingly.
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"(cal)"
The measurement has been calibrated with one of the 1-port calibration types.
Measurement results are corrected accordingly.
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"(cal int)"