Figure 1: Sd 24 Sampling Head Block Diagram - Tektronix SD-24 User Manual

Introduction
2
Generator
Acquisition
System
Strobe
Generator
Acquisition
System

Figure 1: SD 24 Sampling Head Block Diagram

The strobe sense signal is a part of the strobe signal returned to the main
frame. The mainframe monitors the time duration of the strobe drive/strobe
sense loop and adjusts a delay (inside the mainframe) to maintain correct
strobe timing.
Both channels have a step generator. The step generators can indepen
dently assert a negative going or positive going step. Using both channels,
you can perform differential and common mode Time Domain Reflectometry
(TDR) and two port, time domain network analysis.
The acquisition risetime is 17.5 ps or less. The displayed TDR reflected
risetime is 35 ps or less. To ensure proper timing between the two step
outputs, the second channel is equipped with a variable delay.
Step
50 W
TDR Drive
Strobe Drive
Strobe Sense
Step Variable
Generator Delay
50 W
To/from
Mainframe
SD 24 User Manual