63 SNA5000A Vector Network Analyzer User Manual
C.
TRL LINE
The LINE and THRU standards establish the reference impedance for the measurement after
the calibration is completed. TRL calibration is limited by the following restrictions of the LINE
standard
•
Must be of the same impedance and propagation constant as the THRU standard.
•
The electrical length need only be specified within 1/4 wavelength.
•
Cannot be the same length as the THRU standard.
•
A TRL cal with broad frequency coverage requires multiple LINE standards. For example,
a span from 2 GHz to 26 GHz requires two line standards.
•
Must be an appropriate electrical length for the frequency range
D.
TRL MATCH
If the LINE standard of appropriate length or loss cannot be fabricated, a MATCH standard
may be used instead of the LINE.
•
The MATCH standard is a low-reflection termination connected to both Port 1 and Port 2.
•
The MATCH standard may be defined as an infinite length transmission line OR as a 1-
port low reflect termination, such as a load.
•
When defined as an infinite length transmission line, both test ports must be terminated
by a MATCH standard at the same time. When defined as a 1-port load standard, the
loads are measured separately. The loads are assumed to have the same characteristics.
•
The impedance of the MATCH standard becomes the reference impedance for the
measurement. For best results, use the same load on both ports. The load may be defined
using the data-based definition, the arbitrary impedance definition, or the fixed load
definition.
E.
Calibration Reference Z0
•
System Z0: The system impedance is used as the reference impedance. Choose when
the desired test port impedance differs from the impedance of the LINE standard. Also,
choose when skin effect impedance correction is desired for coax lines.
•
Line Z0: The impedance of the line standard is used as the reference impedance or center
of the Smith Chart. Any reflection from the line standard is assumed to be part of the
directivity error.
F.
Test Port Reference Plane
•
Thru Standard: The THRU standard definition is used to establish the measurement
reference plane. Select if the THRU standard is zero-length or very short.
•
Reflect Standard: The REFLECT standard definition is used to establish the position of
the measurement reference plane. Select if the THRU standard is not appropriate AND
the delay of the REFLECT standard is well defined.
3.3.1.5
Greate a custom Cal Kit
There are two methods to create a custom Cal Kit:
Method 1
：
Create custom Cal Kit based on existing Cal kits
Summary of Contents for SNA5000A Series
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