How To Compensate For Cable And Dut Board Delays - HP 81200 User Manual

How to Compensate for Internal and External Delays
HP 81200 Data Generator/Analyzer Platform User Guide, Revision 2.1
How to Compensate for Cable and DUT Board
Delays
Performing a cable delay and propagation delay compensation assures that
the edges of all generator outputs of the HP 81200 system are applied to the
DUT input pins at the same time. The procedure also assures that all
output signals of the DUT are sampled at the same time at the DUT output
pins.
N O TE
This procedure requires the HP E4805A central clock module. In an
extended system, the master clock module is used.
To perform this procedure, you need all the cables which are going to be
used.
You need also an active probe, e.g. the HP 1144A, 800 MHz Active Probe,
10:1
It is recommended to use cables of the same type and same length at all
inputs and outputs.
To compensate for cable and propagation delays:
1 Connect the cables you will use in your application to the HP 81200
system's output connectors.
2 Create a scheme of your application in the Connection Editor. Group the
signals to ports and make the connections in the scheme.
3 In the Parameter Editor set the levels for all DUT input and output ports.
4 Open the Deskew Editor (see "How to Start the Deskew Editor" on
page 202).
Per default, generators are selected in the Type field and cable delay
measurement is enabled.
If you have connected the generator outputs in the Connection Editor,
then you can easily mark the outputs for this measurement by clicking
on All connected.
5 Click the Measure button.
Using Auxiliary Functions
205