[SI-LIST] Re: TDR's and ESD Protection

It's probably being done but:

Although the use of conductive mats & wrist straps are used-- Always
test them to see if they are doing there job.  Especially the wrist
strap--They seem to have bad contact with people with hairy arms!  So
it's wise to test the wrist strap before every use & test the mat on a
scheduled time.

Tek can repair SD-24's for around $2k, I'm down to one channel thanks to
a hairy armed person ;-) working on my TDR while I was at a seminar.
Tek does not sell SD-24 modules anymore.  I found one place for a SD-24
module but was quoted around 11K !  Any info on where replacement SD-24
modules can be purchased?

Rich  

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of JOHN SAWDY
Sent: Tuesday, March 26, 2002 4:32 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] TDR's and ESD Protection


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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