SDI Eye and Jitter Measurements
How-to Guide
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www.tektronix.com/wfm2300
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The stress loop is bi-directional and can be used for input and output of SDI signal. The Test Signal
Generator or SDI output can be used to drive the stress loop as shown in Figure 5. In this case the
simulated 20 meters of Belden 1694A cable can be added to the generated SDI output and then applied
to the cable link to determine if the device at the end of the link can recover the clock and data from the
transmitted SDI signal. If the device fails to recover the signal then the stress loop can be removed and
the test signal generator output of the WFM2300 can be directly connected to the link to test the device
on a short run of cable. The user can then determine if the health of the link is suitable for the
transmission of the SDI signal or additional measures are needed to improve the signal transmission
such as changing the type of cable used or adding a re-clocking DA to the system.
Figure 5.
Generator output via stress loop.
The stress loop can also add an interfering signal to the SDI signal to test the robustness of the receiver.
This can be configured in the PHY measurement menu.
