Measurement Modes; Impedance Measurements (Modes Tdr & Dtdr); General Recommendations - Teledyne T3SP Series Operator's Manual

5. Measurement Modes

In this chapter the specific measurement modes of the T3SP-series devices
are described. The availability of measurement modules can be checked
by pressing the Main Windows toolbar button MODE. A dialog showing all
available measurement modes is raised.
5.1 Impedance Measurements (Modes TDR & DTDR)
Using the impedance measurement mode is a common task in printed cir-
cuit board design and signal integrity testing. This mode allows for measur-
ing single-ended and differential controlled impedance traces. The user can
define tolerance masks and the characteristics of the line by means of the
Impedance Measurement Properties Window(cp. section 5.1.3).
For performing impedance measurements the standard (D)TDR measure-
ment mode must be used. The difference between impedance and TDR
(step response) traces is observable in the Result Visualization window, show-
ing (TTC corrected) impedance traces instead of TDR traces. When selecting
the impedance visualization mode, a tolerance mask can be enabled.

5.1.1 General Recommendations

•
It is highly recommended to activate (D)TTC in order to achieve the
highest possible accuracy (see chapter 4).
•
A suitable probe and 50 Ω SMA-cables must be used for performing
high-performance impedance measurements.
•
Single-ended measurements can be carried out either on channel 1
or channel 2.
•
In case of differential measurements, a set of phase-matched coaxial
cables must be used. It is recommended to use the cables delivered
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