How To Compensate For Cable Delays - HP 81200 User Manual

How to Compensate for Internal and External Delays
HP 81200 Data Generator/Analyzer Platform User Guide, Revision 2.1
3 Click the Measure button.
For generators, the following window pops up:
Figure 114 Deskew Editor—Zero Adjust Window for a Generator Channel
4 Follow the instructions given in this window.
Enter the master cable delay in the provided field. The typical delay of a
1 m (3 feet) SMA cable is about 3.5 ns.
The zero adjustment of analyzers requires a signal generator to be used
as a reference channel. The system proposes the first of the installed
generator channels. If there is no generator installed, the TRIGGER
OUTPUT of the clock module is suggested.
The measured zero adjust value is automatically entered in the table and
the next instruction to connect the next generator output is displayed.
When all marked generators are adjusted the Automated Deskew window
disappears.

How to Compensate for Cable Delays

The cable delay compensation assures that the edges of all generator
outputs of the HP 81200 system appear at the same time at the end of the
cables used in the setup. For the HP 81200 system analyzer inputs the cable
delay compensation assures that all output signals of the DUT are sampled
at the same time at the end of the cables, close to the DUT.
N O TE
To perform this procedure, you need all the cables which are going to be
used.
The cable delay compensation range is ±23 ns.
Perform the cable delay compensation first for the generator outputs, then
for the analyzer inputs.
It is recommended to use cables of equal type and length for all inputs and
outputs.
Using Auxiliary Functions
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