When I bought mine a long time ago there was a really good explanation of the science and math behind how it works.
I remember it uses the nearly infinite number of grounded utility poles as part of the equation. On Fri, May 24, 2019, 10:09 AM <ch...@wbmfg.com> wrote: > Shouldn’t be a difference because there shouldn’t be any ground current in > normal operation. The clamp induces its own current. I think it is up in > the khz area and then measures what is flowing. > > *From:* dave > *Sent:* Friday, May 24, 2019 8:54 AM > *To:* af@af.afmug.com > *Subject:* Re: [AFMUG] Fw: Active Lightning Suppressor - Snake Oil, or > Science? > > Its best if site is powered down but I ve measured either way and havent > really seen much difference > > > On 5/24/19 9:10 AM, Lewis Bergman wrote: > > No, it isn't that simple. If you clamp it on a ground rod below the ground > ring attachment it gives you the resistance to ground of that particular > rod. > You clamp it on the incoming nuetral line from the power company to > measure the complete site resistance. > > On Fri, May 24, 2019 at 8:31 AM Josh Luthman <j...@imaginenetworksllc.com> > wrote: > >> You just clamp that around a ground rod and it gives you ohms, resistance >> to earth? Is it really that simple? >> >> Josh Luthman >> Office: 937-552-2340 >> Direct: 937-552-2343 >> 1100 Wayne St >> Suite 1337 >> Troy, OH 45373 >> >> >> On Thu, May 23, 2019 at 10:01 AM Lewis Bergman <lewis.berg...@gmail.com> >> wrote: >> >>> R56 is a standard developed by Motorola for critical communications >>> sites. Chuck can likely point you to a similiar standard developed by NEC >>> or some Telco consortium that defines grounding standards for telco >>> facilities. Half the standards are usually about human safety and the other >>> half are about equipment safety. >>> >>> The bottom line is, if you can get your site to less than 5 Ohms earth >>> resistance to ground you are about as good as you can hope for. Lower is >>> better but below 5 Ohms the return on investment diminshes rapidly. I think >>> the lowest I have seen is 0.5 Ohms on a brand new site. We put a lot of >>> grounding, enhancemnet material, etc. But it is like good insurance and it >>> does work. We had an old tower that had poor grounding. We retrofitted it >>> with a modern system and lowered the number of strikes from an average of >>> 15 or so a year to 1 in 3 years. >>> >>> You can use a device like this: Clamp on ground tester >>> <http://www.testequipmentdepot.com/AEMC/ground-resistance-testers/clamp-on/clamp-on-ground-resistance-tester-6416.htm?ref=gbase&gclid=CjwKCAjwiZnnBRBQEiwAcWKfYi9_sp7BYOU7SUh8oCsy0VRd-Sm9Kx05ShpV-11tT_xAboQ4UAY5GxoClmgQAvD_BwE> >>> to easily measure the resistance of a whole site. You do have to know where >>> and how to use it. To accurately measure parts of a grounding system >>> accurately you have to know how it is designed. Most of the time a zer >>> resistance reading means you are measuring a loop of copper. I laugh every >>> time I go to a cell site and they have a ground test pound that is >>> basically a loop on top of a ground rod. Yaeh, no wonder they passed the >>> test. >>> >>> On Wed, May 22, 2019 at 9:32 PM Chuck McCown <ch...@wbmfg.com> wrote: >>> >>>> Google “Air Terminal Lightning” and then click on images. >>>> >>>> Or just check out some of these: >>>> >>>> https://www.erico.com/category.asp?category=R2438 >>>> >>>> https://www.jjengineersindia.com/lightning-protection-system.html >>>> >>>> https://www.jmvearthing.com/early-streamer-emmission.html >>>> >>>> This one has some snake oil type of hype too: >>>> >>>> http://www.lps-pacifica.com/Ellips.html >>>> >>>> Ever read “Something Wicked This Way Comes”? >>>> >>>> >>>> *From:* Matt Hoppes >>>> *Sent:* Wednesday, May 22, 2019 7:16 PM >>>> *To:* AnimalFarm Microwave Users Group >>>> *Subject:* Re: [AFMUG] Fw: Active Lightning Suppressor - Snake Oil, or >>>> Science? >>>> >>>> So if this is all snake oil - why do some commercial towers have some >>>> variation of this at the top? >>>> >>>> That’s what I’m trying to understand. >>>> >>>> An engineer for clear channel told me he’s seen a corona develop around >>>> one of his towers that had a similar item on it when storms are coming >>>> through the area. >>>> >>>> On May 22, 2019, at 2:56 PM, Bill Prince <part15...@gmail.com> wrote: >>>> >>>> My SO is unusually wary of lightning and lightning strikes. If there is >>>> the slightest hint of lightning or thunder, she reverts to the air gap >>>> method of lightning protection. If there are no wires connected to a piece >>>> of electronics, then it is most safe. >>>> >>>> Doesn't help a lot in our business, but that is what she does. >>>> >>>> >>>> >>>> bp >>>> <part15sbs{at}gmail{dot}com> >>>> >>>> >>>> On 5/22/2019 11:51 AM, Matt Hoppes wrote: >>>> >>>> Are you suggesting that if you power off the equipment during a >>>> lightning strike it won’t take damage? Why would that be? >>>> >>>> On May 22, 2019, at 2:42 PM, dave <dmilho...@wletc.com> wrote: >>>> >>>> I have been working with this AS3935 franklin lightning sensor for >>>> about 6 months now and learned so much more about lighting and its >>>> projected energies and possible frequencies its amazing how this little >>>> sensor can detect distance and the amount of energy BEFORE it strikes. >>>> So,armed with this ability I am solely working on a design along with >>>> IR sensing to help mitigate damage to a site during a storm. >>>> >>>> I am still working on the timing to be able to shut down power to the >>>> gear outside for a time period at which if lightning is still present >>>> remain off till storm passes. >>>> >>>> End of Run sites are the worst but knock on wood after a year or 2 of >>>> planning and cleaning up the existing grounds everything seems well. >>>> >>>> >>>> >>>> <Vcard.jpg> >>>> On 5/22/19 9:23 AM, ch...@wbmfg.com wrote: >>>> >>>> This is from the executive director of the lightning protection >>>> institute. >>>> >>>> -----Original Message----- From: Bud VanSickle >>>> Sent: Wednesday, May 22, 2019 7:41 AM >>>> To: 'Chuck McCown' >>>> Subject: RE: [AFMUG] Active Lightning Suppressor - Snake Oil, or >>>> Science? >>>> >>>> Snake oil for sure. You can't stop lightning strikes because of the >>>> volume >>>> of energy and short time period. If you put one of these devices on a >>>> fully >>>> grounded metallic tower, it would most likely take a strike to ground. >>>> Of >>>> course, if you ground your metallic tower properly, it is like a giant >>>> lightning rod, so you are out the money for this "topper". By the way, >>>> on >>>> tall towers, lightning doesn't necessarily strike the top anyway - it >>>> is >>>> almost never straight vertical and may be at a 45 degree angle to the >>>> side. >>>> But let me ask you this - if all the pine needles in a forest can >>>> release >>>> ions (which they can and do) or all the blades of grass on the prairie, >>>> why >>>> does lightning still strike there? >>>> Bud VanSickle >>>> >>>> -----Original Message----- >>>> From: Chuck McCown [mailto:ch...@wbmfg.com] >>>> Sent: Wednesday, May 22, 2019 7:51 AM >>>> To: b...@lightning.org >>>> Subject: Fw: [AFMUG] Active Lightning Suppressor - Snake Oil, or >>>> Science? >>>> >>>> I think snake oil. You? >>>> >>>> >>>> >>>> -- >>>> AF mailing list >>>> AF@af.afmug.com >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> >>>> >>>> -- >>>> AF mailing list >>>> AF@af.afmug.com >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> >>>> ------------------------------ >>>> -- >>>> AF mailing list >>>> AF@af.afmug.com >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> -- >>>> AF mailing list >>>> AF@af.afmug.com >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> >>> >>> >>> -- >>> Lewis Bergman >>> 325-439-0533 Cell >>> -- >>> AF mailing list >>> AF@af.afmug.com >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > > > -- > Lewis Bergman > 325-439-0533 Cell > > > ------------------------------ > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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