Concepts and Features
R&S
®
ZNC
86
User Manual 1173.9557.02 ─ 13
The procedure involves the following steps:
1. Perform a calibration of your network analyzer, using the test setup and the calibration
type you wish to perform with your calibration unit.
2. Connect the calibration unit to the network analyzer.
3. Access the "Characterize Cal Unit" dialog ("CHANNEL > CAL > Cal Devices > Char-
acterize Cal Unit") and start the characterization wizard.
4. Step through the wizard, following the instructions in the dialogs.
Dependency between calibration types and characterization data
A cal unit characterization provides full one-port (OSM) data at the selected ports plus
two-port (Through) data between any pair of selected ports. The measurement of
Through data is optional, however, it is required for some calibration types. The following
table gives an overview.
Calibration type
Characterization data required
Refl Norm Open
Refl Norm Short
Refl OSM
UOSM
TOSM
OSM CalPort 1, OSM CalPort2 ... (all calibrated ports)
Trans Norm Both
Trans Norm Forward
One Path Two Ports
OSM CalPort 1, OSM CalPort2 ... (all calibrated
ports), Through (between all pairs of ports)
3.5.6 Scalar Power Calibration
The purpose of a scalar power calibration is to ensure accurate source power levels and
power readings at a particular position (calibration plane) in the test setup. Scalar power
calibration is essentially different from the system error correction described in
A power calibration is required for accurate measurement of wave quantities or ratios
(see section
, on page 17). For best accuracy, choose a cali-
bration method according to the table below.
Table 3-7: System error correction and power calibration for various measurements
Measurement
System error correction
Scalar power calibration
S-parameter meas. on linear DUTs
Yes, necessary
Not necessary
Meas. of wave quantities or ratios
on linear or non-linear DUTs
Yes, recommended
a-wave: power (source) necessary
b-wave: meas. receiver necessary
Power sweep, e.g. for compression
point measurement
Yes, necessary
Power (source): necessary
Meas. receiver: not necessary
Calibration