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INSTRUCTION MANUAL
SECT IO N 5 -
CALIBRATION OF ELECTRICAL PERFORMANCE PARAMETERS
1912 1 E l T o ro R d
●
Si l vera do, Ca lifo rni a 9 26 76
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(9 49) 459 -96 00
●
Rev050321
The decoupling factor and impedance measurements must be performed
using a Vector Network Analyzer with a [minimum] two-port S-parameter
Test Set. Also needed is the CLEMA-6146 Calibration Adapter Pair with the
63 cm length, 4 mm diameter copper rod, and 50 ohm termination.
For decoupling factor and impedance measurements, the height of the 4
mm copper rod must be adjusted to be in the center position of the clamp
opening (see section 4.3).
Calibration of Impedance and Decoupling Factor is based on S11, S21, S12
and S22 measurement data in a 50 ohm system (
Z
ref
). However, the
characteristic impedance of the test jig (
Z
’
ref
) is different from 50 ohms. It is
determined by the height of the clamp opening above the ground plane.
Using ABCD transformation, a set of transformed parameters independent
from
Z
ref
is obtained using the ABCD Transformation Equations given later in
this section.
Prior to performing the measurements, a full 2-port calibration must be
performed (2-port reflection, transmission, and isolation). Illustrated in Figure
13 are examples of the setup for the network analyzer calibration, as well
as the appropriate accessories and connections for the S-Parameter
measurements of the EM Clamp.
Four sets of data are required:
S11
,
S21
,
S12
and
S22
; each set consisting of
magnitude and phase values at each test frequency.
Distributed by: Reliant EMC LLC, +1 408 916
‐
5750, [email protected], www.reliantemc.com
