I will be out of the office starting 11/22/2012 and will not return until
11/23/2012.
I will have very limited access to my e-mail,
therefore please contact my deputy:
arvin...@twn.tuv.com
-
This message is from the IEEE Product Sa
In message
<64D32EE8B9CBDD44963ACB076A5F6ABB0262A557@Mailbox-Tech.lecotech.local>,
dated Wed, 21 Nov 2012, "Kunde, Brian" writes:
So what a part is rated and how it is protected is often not clear to
me.
I suggest you look at a different approach. What matter is whether there
is a safety i
I really appreciate everyone who commented on this topic.
I should have mentioned that our products are generally not certified by a
national authority so they are subject to Field Inspections where the
inspecting engineer doesn't always have the ability to perform fault testing on
site. So gen
Hello Brian,
Whether or not there is a requirements for supplementary overcurrent protection
depends on the product classification and applicable safety standard. In
general, supplementary overcurrent protection is not required. For example, in
IEC 60950-1, the product still needs to pass abnor
Consider Tranzobs (trade-name) between the signal lines and a good solid ground
(pcb or metalwork). They are exceptionally fast acting avalanche diode
transient suppressors. If you do, keep interconnections as short as possible to
minimise path inductance.
http://www.vishay.com/diodes/protection
Joe Fischer used to be a part of the CISPR committees writing the standards.
It is unlikely at best that FCC would design the equipment incorrectly.
Usually their equipment is designed per the CISPR drawings.
Ken Javor
Phone: (256) 650-5261
From: Wendy Nya
Reply-To: Wendy Nya
Date: Tue, 20
HI folks,
I guess I finally had to weigh in on this one. We need to keep a few things in
mind here:
1) The use of the EM Clamp is for when a CDN cannot be used, that doesn't mean
when you don't own one. It means when it's impractical.
2) The clamp construction, described in one of the CISP
Some good suggestions.
Can you use shielded cable and terminate the shield well on both ends?
I don't know what your devices are or what the interface is or what it does but
generally this test has a pass/fail criteria B, so if it can return the I/O to
normal operation after the test then that
Small series R or alternate L (or CM-coil) and a suitable C to GND
High off filter configured at 5 MHz approx. Not too low F (read: high
inductance) as interwinding capacitance will spoil
the effect.
The essential factor here is if the ground plane
is continuous, contains no slots (if PCB
When doing ±1kV burst (via capacitive coupling clamp) onto an unshielded
signal cable, the EUT gets problems (fail operation).
The communication signals on the cable are rather slow, below 1MHz.
We are planning to make a burst filter and we have ground / chassis pins
close by.
Any recommen
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