[SI-LIST] TDR's and ESD Protection
- From: JOHN SAWDY <JSAWDY@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 26 Mar 2002 16:32:11 -0500
We are experiencing a high failure rate on our Tektronix SD-24 TDR heads
when we test cable assemblies. Our cables assemblies sometimes are 40 to 80
feet in length and consist of multiple coax and twinax cables within each
assembly. We typically use the TDR to measure differential electrical
length and skew of the finished assembly.
We use wrist straps and conductive mats on the benches. We short all pins
to ground before we connect to the TDR to try to remove any residual
charges.
I am wondering if anyone else has some experience with this and if they
might have a solution.
I have also heard that "mechanical noise" generated by movement of the cable
may be a culprit but I am not sure of the magnitude of such noise. Can
anyone confirm that this is a possibility?
Does anyone have any experience to suggest that one brand may be more robust
then another or that one model of head may be more robust.
Looking forward to your responses,
John
John F. Sawdy, Senior Applications Engineer
Meritec, a division of Associated Enterprises
voice mail: 440-354-3148 x 267
fax: 440 -354-0687
mailto:jsawdy@xxxxxxxxxxx
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