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the menu item
View
→
S-Parameters
→
Select Parameter
→
S
XY
or by
pressing the hotkey combination CTRL-SHIFT-F9/F10.
•
A special function to reduce asymmetry effects of the non-ideal mea-
surement system is to equalize the
S
12
/
S
21
-parameters. This option
can be activated by checking the
Equalize transmission coefficients in
F2P
box in the
Advanced
tab in the
Options Dialog
(see section
Please note:
currently there is no live mode available in Quick Operation Mode.
6.5 Measurement Mode
ε
base
(optional, not for DTDR-800)
This measurement mode is an optional software module for measuring the
dielectric constant
ε
r
of
core- and prepreg-materials
. Two especially for
this purpose manufactured single-ended Microstrip lines with well defined
lengths are needed to measure the dielectric constant with this module. The
Gerber-files can be generated automatically.
For starting the measurement, right-click a sample or choose the MODE
button to select this mode. A suitable RF-probe should be used for this
kind of measurements because ultra-wideband TDR-signals are used for the
traveling-time measurements. Please follow the procedure as described be-
low:
•
Manufacture test coupons with two Microstrip lines based on the def-
initions provided by Sequid GmbH or use the integrated test coupon
generator. The generator is accessible via the
Main Window
menu
entry
Extras
→
Create
ε
r
-Coupon
.
•
Use a suitable single-ended probe for applying the TDR-signal to the
lines on the test coupon. Best practice but more sophisticated is to
use coaxial connectors (cp. section
•
Open the
Impedance Measurement Properties Window
and specify
60