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HDO9000 High Definition Oscilloscopes Operator's Manual
Cable De-Embedding Option
Losses in the cables used in the test setup can reduce the accuracy of your signal (for example,
signal amplitude and risetime), as well as introduce Inter-Symbol Interference. These cable effects
can dramatically alter measurements and potentially create mask test violations.
Cable De-Embedding, available as an option, allows you to quickly specify the characteristics of the
cables (typically found on the cable's data sheet) in your test setup and analyze your signal with the
effects of the cables removed. The compensated signal is a more accurate representation of what
was actually transmitted.
When Cable De-Embedded is installed and selected from the channel pre-processing settings, the
Cable De-Embedding dialog will appear for you to describe the cable being used on the channel.
1. Touch Vertical > Channel # Setup... from the menu bar.
2. On the Cx dialog, check Cable De-Embeddingto display the Cable De-Embedding tab.
3. On the Cable De-Embedding dialog, touch Cable Specified by and choose either:
Attenuation Constants. Enter the cable loss model constants (provided by the manufacturer) in
Cable A1 and Cable A2.
Or
Attenuation Table. Enter the first set of Frequency and Attenuation values. Touch Add to
continue adding rows as needed.
Tip: To edit a row in the table, select the row, change values, then touch Change. To
delete a row, select the row and touch Delete.
4. Touch Delay Specified by and choose from Propagation Velocity, Nominal Delay, or Dielectric
Constant. Enter the value in the field of the same name.
5. Enter the Cable Length in inches.
6. Click Apply to initiate the cable de-embedding for the signal on this channel so that the effects
of the cable are removed.
7. To save this cable configuration for future use, touch File Name [DefaultCable] and enter a
name, or touch Browse and select a file to overwrite. To reload previously saved
configurations, browse to the file, then touch Load.
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