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Reference
36
80E00 Electrical Sampling Modules User Manual
Overview Control elements & resources
To take a comm on mode or differential TDR
measurement (cont.)
20. When t he TDR steps on the two channels are opposite
(one positive and one negative), you can define a math
waveform that represents the difference signal by
pressing the VERTICAL MENU button, selecting the
Vert tab, selecting Waveform M1, On, and then
selecting Define, C1, +, C2, M ath Waveform On, and
OK. Set the scale to ρ (if using volts, subtract the
waveforms.).
Take a
measurement
21. Take your measurement. For more information see Take
automatic measurements on page 25, or Take cursor
measurements on page 26.
TDT
measurements
22. You can make forward and reverse Time Domain
Transmissi on (TDT) measurements using the 80E04. To
perform a TDT measurement, connect one sampling
module channel to the input of the device under test and
the other sampling module channel to the output of the
device under test.
23. Then alternately enable the step generators on one
channel whi le sampling the t ransmitted signal on the
other channel to perform forward and reverse TDT
measurements. You measure the step transmitted
through the device rather than reflections from the
device (as in TDR).
Note: If the second channel is not connected to the same
device as the first channel, crosstalk is displayed, as
opposed to the step transmitted through the device.
Device under test
Take a
measurement
24. Take your measurement. For more information see Take
automatic measurements on page 25, or Take cursor
measurements on page 26.