Concepts and Features
R&S
®
ZNC
70
User Manual 1173.9557.02 ─ 13
Calibration Type
Standards
Parameters
Error Terms
General Accuracy
Application
TRM
(2-port)
Reflect (equal at
both ports), Match,
Through
All
Reflection tracking,
Source match,
Directivity,
Load match,
Transmission track-
ing
High
Reflection and
transmission meas-
urements, espe-
cially in test fixtures.
TRL
(2-port)
Reflect (at both
ports),
Through, Line1,
Line2/3 (optional),
combination with
TRM (optional)
All
Reflection tracking,
Source match,
Directivity,
Load match,
Transmission track-
ing
High, high directivity Reflection and
transmission meas-
urements, espe-
cially for planar cir-
cuits. Limited band-
width.
TNA
(2-port)
Through, Attenua-
tion, Symmetric net-
work
All
Reflection tracking,
Source match,
Directivity,
Load match,
Transmission track-
ing
High, lowest
requirements on
standards
Reflection and
transmission meas-
urements, espe-
cially for planar cir-
cuits.
1) Or any other 3 known one-port standards. To be used in a guided calibration, the known
standards must be declared to be Open, Short, and Match irrespective of their properties.
2) Or any other known two-port standard. See remark above.
The calibration type must be selected in accordance with the test setup. Select the cali-
bration type for which you can obtain or design the most accurate standards and for which
you can measure the required parameters with best accuracy.
3.5.1.1
Normalization (Refl Norm..., Trans Norm...)
A normalization is the simplest calibration type since it requires the measurement of only
one standard for each calibrated S-parameter:
●
One-port (reflection) S-parameters (S
11
, S
22
, ...) are calibrated with an Open or a
Short standard providing the reflection tracking error term.
●
Two-port (transmission) S-parameters (S
12
, S
21
, ...) are calibrated with a Through
standard providing the transmission tracking error term.
Normalization means that the measured S-parameter at each sweep point is divided by
the corresponding S-parameter of the standard. A normalization eliminates the fre-
quency-dependent attenuation and phase shift in the measurement path (reflection or
transmission tracking error). It does not compensate for directivity or mismatch errors.
This limits the accuracy of a normalization.
Calibration