Teledyne LeCroy WaveExpert 100H Operators Manual - Manual (Page 87)

Wave Expert
WE-OM-E Rev A
85
A Differential TDR measurement on a 1-port device is denoted by
Similarly the Differential S-parameters of a 2-port differential device are given by:
S
DD11
(Differential Port 1 Return Loss)
S
DD12
(Differential Reverse Transmission Loss)
S
DD21
(Differential Forward transmission Loss)
S
DD22
(Differential Port 2 Return Loss)
Making S-parameter Measurements
A calibration must be performed to enable S-parameter measurements selection. Refer to
“Reference Plane Calibration” for the calibration procedure.
S-parameter measurements are accessible through the Normalized trace menu:
Measurement selections under the TDR Normalization tab. Normalized trace can be displayed either
as Impedance or the corresponding S-parameter.
Depending on the type of calibration (Single-ended or Differential) and number of ports (one or two),
the corresponding s-parameters appear as selections under the TDR Normalization tab.
S-parameters are displayed in decibels (dB) over a 20 GHz frequency range, internally set by the
measurement. The trace can be adjusted using the features available in the ZOOM menu.