[SI-LIST] Re: Emission level vary for same type of SATA cables bu t different vendors
- From: "Clewell, Craig" <Cclewell@xxxxxxxxxxxxx>
- To: "'kunal.pisi@xxxxxxxxxxx'" <kunal.pisi@xxxxxxxxxxx>
- Date: Tue, 2 Oct 2007 11:28:44 -0400
Kunal,
Without investigating the entire set up it is difficult to magically come up
with a solution as to why there are differences. However, assuming the
entire test set up is the same for both cables you may be able to find an
answer by investigating some of the differences in the cables themselves:
What kind of difference do you see?
1. Is there just a couple of dBm or are there large differences between the
two measurements (and at what frequencies)?
2. Are the terminations the same on each cable?
3. Is the shield thickness the same for each of the cables?
4. Are the shields the same configuration in both cables (do they both have
an overlap)?
5. Is the shield made of the same material in both cables?
6. Is the O.D. of the wires in each cable the same?
7. etc...
The solution may not be as simple as knowing that the shield of one cable is
different from the other. If you would like to really understand what is
going on in the cable once you discover any differences in their
construction I might suggest digging in to a copy of "Cable shielding for
Electromagnetic Compatibility", which was written, produced and directed by
Anatoly Tsaliovich.
CC
-----Original Message-----
From: Kunal Sabavat [mailto:kunal.pisi@xxxxxxxxxxx]
Sent: Tuesday, October 02, 2007 10:46
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Emission level vary for same type of SATA cables but
different vendors
Hello,
I am seeing different levels of EMI measured values from lab for same type
of SATA cables but from two different vendors. One of the vendors cable
shows much higher EMI values compared with another vendor cable. measurement
setup is same for two vendors cables. I still don't have full measurement
report. these are SATA internal cables, length of the cable is half meter.
Can someone explain what could be wrong with the cable showing higher EMI
level? Taking cable TDR Impedance scan will help us understand?
--
Kunal
---------------------------------
Did you know? You can CHAT without downloading messenger. Click here
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
|**************************************************************************|
This email is intended only for the person or entity to which it is
addressed and may contain confidential, proprietary and/or privileged
material. Any review, distribution, reliance on, or other use of this
information by persons or entities other than the intended recipient is
prohibited. If you receive this message in error, please immediately notify
the sender and delete it and all copies of it from your system. Thank you.
|**************************************************************************|
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
- » [SI-LIST] Re: Emission level vary for same type of SATA cables bu t different vendors
