PXIe Platform Bit Error Rate Tester
|
BERTPXIe-1003/1005
14
Version
1.00
Coherent Solutions Ltd.
Connector care
To connect to the BERTPXIe module, Rosenberger to 2.92 mm break-out cables are required.
Connectors in the high frequency range have precision dimensions and require proper
handling to avoid inadvertent damage. To connect or remove the Rosenberger cable, use the
proper connector removal tool.
The Rosenberger connector on the BERTPXIe front panel allows only a limited number of
matings. Therefore, avoid frequent connections/disconnections.
Although all connectors eventually wear, with knowledge, care, and proper technique, you can
maximize the accuracy, repeatability, and lifetime of coaxial connectors. The most common
cause of measurement error is bad connections caused by malfunctioning connectors.
I
MPORTANT
•
If you use a pattern generation or error detection channel as
single-ended output or input, terminate the other end with a 50
ohm terminator.
•
To avoid waveform distortion and therefore ensure module
performance, terminate the RF ports of all unused channels with
50 ohm terminators.
Cable selection
When you measure differential signals or use the pattern generator to drive a differential
circuit, you must consider matching the phase of the cables being used. Ideally, the cables
used to attach the DUT need to have the same time difference, which is similar to having the
same length.
For slow signals with large bit periods, a cable mismatch such as 5 ps has little impact on the
results. However, for fast signals with small bit periods, the impact is significant. For example,
for a data rate of 14.5 Gb/s that has the bit period of 70 ps, a cable mismatch of 5 ps may
lead to a significant error.
