System Overview
R&S
®
ZVA
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Getting Started 1145.1090.62 ─ 13
Automatic calibration is generally faster and more secure than manual calibration,
because:
●
There is no need to connect several standards manually. The number of connec-
tions to be performed quickly increases with the number of ports; see "TOSM Cali-
bration".
●
Invalid calibrations due to operator errors (e.g. wrong standards or improper con-
nections) are almost excluded.
●
No need to handle calibration kit data.
●
The internal standards don't wear out because they are switched electronically.
Automatic calibration is less flexible than manual calibration:
●
Some calibration types (TOM, TRM, TRL, TNA) are not available.
●
Automatic calibration cannot be performed for segmented frequency sweeps.
Please observe the safety instructions in the "Technical Information" provided with the
calibration unit to avoid any damage to the unit and the network analyzer. Safety-rela-
ted aspects of the connection and operation of the units are also reported in the sec-
tions below.
3.4.4 Power Calibration
The purpose of a power calibration is to ensure accurate source power levels and
power readings at a particular position (reference plane) in the test setup. Power cali-
bration is essentially different from the system error correction described in the previ-
ous sections. For best accuracy, a power calibration should be performed in addition to
a system error correction.
In general, a power calibration involves two stages:
1.
Source power calibration:
An external power meter is connected to the reference
plane. The analyzer modifies its source power until the power meter reading corre-
sponds to the desired source power value.
2.
Receiver power calibration:
The analyzer uses the calibrated source signal to
adjust the power reading at the receiver port.
The analyzer provides power calibration wizards for various measurement modes.
3.4.5 Offset Parameters
Offset parameters complement the system error correction and power calibration, com-
pensating for the known length and loss of a (non-dispersive and perfectly matched)
transmission line between the calibrated reference plane and the DUT. The analyzer
Calibration
