Breaking News
Blog

ZAP (EMP)! (hissssssssss)

NO RATINGS
View Comments: Oldest First | Newest First | Threaded View
Page 1 / 2   >   >>
David Ashton
User Rank
Blogger
re: ZAP (EMP)! (hissssssssss)
David Ashton   12/15/2011 9:49:43 PM
NO RATINGS
I am curious as to whether normal Zener-type suppressor diaodes can protect agains EMP events such as would be caused by a nuclear explosion? someone I have argued this with says no, the energy levels are too high, but a lot of the suppressors can absorb a lot of energy. Anyone have any solid info on this?

old account Frank Eory
User Rank
Rookie
re: ZAP (EMP)! (hissssssssss)
old account Frank Eory   12/15/2011 11:09:48 PM
NO RATINGS
The zener won't help, since large currents will be induced in every conductor that is within the field of the EMP. To protect an electronic device, you need to enclose it in an insulator, then in a Faraday cage or even multiple layers of Faraday cages with insulators in between them. In the event of a nuclear explosion or massive solar flare, if protecting electronic devices is foremost on your mind, put each in a plastic bag, then wrap it completely in aluminum foil with no gaps. For extra protection, put all that in another plastic bag and wrap that one completely in aluminum foil. And if that's not enough, then you probably won't be around afterward to worry about it!

David Ashton
User Rank
Blogger
re: ZAP (EMP)! (hissssssssss)
David Ashton   12/16/2011 10:13:40 AM
NO RATINGS
Thanks for that Frank. @ And if that's not enough, then you probably won't be around afterward to worry about it! I guess that's why not many products have it....

mac_droz
User Rank
Rookie
re: ZAP (EMP)! (hissssssssss)
mac_droz   12/16/2011 11:44:54 AM
NO RATINGS
A friend of mine worked as a technician in the army some time back. They were servicing some old Russian radar equipment where there was a lot of microwave diodes. They were all socket types (so you could change them) and spare ones were all packed tightly in lead (they looked like bullets on the belt). He was saying that it was because they were to survive nuclear EMP.

Renkluaf
User Rank
Rookie
re: ZAP (EMP)! (hissssssssss)
Renkluaf   12/16/2011 7:37:47 PM
NO RATINGS
Go to a flea market & buy a microwave oven. Cut off the electrical cord so you can't accidently use it and put your electronic toys inside.

M Walter
User Rank
Rookie
re: ZAP (EMP)! (hissssssssss)
M Walter   12/16/2011 7:51:57 PM
NO RATINGS
Was not too uncommon a requirement 20 years ago for US military aircraft. My company used to design/build product for varous military fighters and bombers and had to demonstrate EMP hardness of design. Usually it was done by analysis: only one facility that I could recall that could do the test. We haven't seen an EMP requirement now in over 10 years

nc344
User Rank
Rookie
re: ZAP (EMP)! (hissssssssss)
nc344   12/16/2011 8:16:12 PM
NO RATINGS
I was involved with emergency communications at the state level. We have a full enclosed room with a massive door that houses all of the HF and VHF communications equipment used to communicate with FEMA. The antenna and power circuits are filtered at the entrance with EMP devices. The military provides the technical support and maintenance. I'm more concerned with on-board computers in cars, trains and aircraft that would fail. The power grid would loose regulation of voltage and frequency. Cell phones would be lost. The only communication that would work would be the old crossbar switches and the Model 500 telephone, if any still exist. The technically advanced nations are one EMP pulse away from the caves.

WKetel
User Rank
Rookie
re: ZAP (EMP)! (hissssssssss)
WKetel   12/17/2011 4:13:51 AM
NO RATINGS
Now we read that it is possible that we may get another huge solar flare in this current sunspot cycle, for some unknown reason. And the assertion is that it could take out the power grid. That could be interesting. For adequate shielding we need both a magnetic shunt, to lead the magnetic flux past our protected device, and a conductive shield, to assure that there is no voltage gradient developed across our protected devices. My guess is that all of those low voltage plastic cased devices will not be adequately protected. A serious disconnect function, such as unplugging ones electric meter, could offer the best cheap and fast protection we would have. But I wonder, would it also destroy all of the electronic engine controls and leave us with no engine driven transportation? What would it do to the avionics in a plane? Do we even have a clue about this whole thing, or is it all speculation?

sharps_eng
User Rank
Rookie
re: ZAP (EMP)! (hissssssssss)
sharps_eng   12/17/2011 8:14:53 PM
NO RATINGS
it's too much to think about protecting everything, start with predicting the failure of critical items in the essential services / utilities; and making sure that two or more backups/replacement modules are safely stored with personnel available to effect the switchover. Weak links: (1) anything electronic connected to an intended or unintended antenna. (2) Include power supplies and user interface connections in (1) (3) anything vulnerable to failure of an upstream controller or service due to #1. (4) Anything not tested and proven to withstand EMP cannot be expected to work afterwards. EMP magnetic pulses can be as powerful compared to ordinary AC cable fields as a static discharge is compared to an AA cell, and with the same sort of risetime. It is not rocket science, it just isn't the way we have been doing it in commercial equipment. Basically we are talking optical fibre communications, battery operation and metal enclosures; shielded CRTs/keyboards or replaceable user interface items like keyboards and screens with plenty of spares stored. In a hostile action, EMP assaults would be repeated in order to take out repaired equipment. Old military radio equipment may be useful as long as you have spares and if possible trained operators..

agk
User Rank
Rookie
re: ZAP (EMP)! (hissssssssss)
agk   12/18/2011 6:06:20 AM
NO RATINGS
thunder storm lightning strikes one can protect as for as to a limited level. if the strike is powerfull i have seen the antenna cable and the electronic gadget every thing gets fired to a level that it got to be rplaced. Best way is to get insured.

Page 1 / 2   >   >>
Top Comments of the Week
August Cartoon Caption Winner!
August Cartoon Caption Winner!
"All the King's horses and all the KIng's men gave up on Humpty, so they handed the problem off to Engineering."
5 comments
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed
Radio
LATEST ARCHIVED BROADCAST
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.
Flash Poll