I came across an article about a cattle mutilation and the guy was using an EMF meter to look for aliens or something. His meter detected them, no surprise.
I thought the EMF meter was invented by the movie industry, but apparently they are real. Google tells me they are widely purchased by ghost hunters. shudder! Not much hope for humanity. But I digress.
So is there an actual use for one, maybe in electronics engineering or something? I haven't seen one discussed in this group, I did search.
What do they do, and why?
I came across an article about a cattle mutilation and the guy was using an EMF meter to look for aliens or something. His meter detected them, no surprise.
I thought the EMF meter was invented by the movie industry, but apparently they are real. Google tells me they are widely purchased by ghost hunters. shudder! Not much hope for humanity. But I digress.
So is there an actual use for one, maybe in electronics engineering or something? I haven't seen one discussed in this group, I did search.
What do they do, and why?
I came across an article about a cattle mutilation and the guy was using an EMF meter to look for aliens or something. His meter detected them, no surprise.
I thought the EMF meter was invented by the movie industry, but apparently they are real. Google tells me they are widely purchased by ghost hunters. shudder! Not much hope for humanity. But I digress.
So is there an actual use for one, maybe in electronics engineering or something? I haven't seen one discussed in this group, I did search.
What do they do, and why?
If you purchased a junk EMF meter like this: <https://www.ebay.com/itm/363819859401>
to find ghosts or determine if something might fry your brain, your
brain is already fried. I have to confess that I bought one of these
and found it useful for finding 60 Hz power line radiation but not
much else. The sensitivity decreases rapidly with increasing RF
frequency.
On Thursday, June 2, 2022 at 12:00:52 PM UTC-4, Jeff Liebermann wrote:
If you purchased a junk EMF meter like this:
<https://www.ebay.com/itm/363819859401>
to find ghosts or determine if something might fry your brain, your
brain is already fried. I have to confess that I bought one of these
and found it useful for finding 60 Hz power line radiation but not
much else. The sensitivity decreases rapidly with increasing RF
frequency.
I won't claim a fresh brain but the advertising hype on these products did peg my BS meter.
On the other hand, at about $20 for some of the cheapies, would they be useful to avoid hitting a power line drilling through a wall or digging in the garden? You mentioned 60 Hz power line radiation.
EMF (electro-magnetic field) can be anything from 60 Hz power line
radiation, to microwave emissions.
60 Hz? Newbie. 25 CPS is the way to go
--
_____________________________________________________
Knowledge may be power, but communications is the key
dan...@panix.com
[to foil spammers, my address has been double rot-13 encoded]
In <nslh9h1vu1a9q44vaabmtuj4gelidgva3l@4ax.com> Jeff Liebermann <jeffl@cruzio.com> writes:
[snip]
EMF (electro-magnetic field) can be anything from 60 Hz power line >>radiation, to microwave emissions.
60 Hz? Newbie. 25 CPS is the way to go
On Thursday, June 2, 2022 at 12:00:52 PM UTC-4, Jeff Liebermann wrote:
I won't claim a fresh brain but the advertising hype on these products
If you purchased a junk EMF meter like this:
<https://www.ebay.com/itm/363819859401>
to find ghosts or determine if something might fry your brain, your
brain is already fried. I have to confess that I bought one of these
and found it useful for finding 60 Hz power line radiation but not much
else. The sensitivity decreases rapidly with increasing RF frequency.
did peg my BS meter.
On the other hand, at about $20 for some of the cheapies, would they be useful to avoid hitting a power line drilling through a wall or digging
in the garden? You mentioned 60 Hz power line radiation.
Fortunately, some organizations are
re-discovering the benefits of DC power: <https://en.wikipedia.org/wiki/High-voltage_direct_current> <https://oca.dc.gov/page/dcplug>
such as no electromagnetic radiation.
Hardly. I prefer my power delivered as DC as Edison and the other
patriarchs of power transmission intended it. For a time (early
1970's), I had wall outlets that delivered 12V DC[1].
would arc weld the power plug to the receptacle. Running AC wall
switches on DC had the same problem. DC connectors and switches were
too expensive, so I gave up.
On 03/06/2022 17:33, Jeff Liebermann wrote:
Fortunately, some organizations are
re-discovering the benefits of DC power:
<https://en.wikipedia.org/wiki/High-voltage_direct_current>
<https://oca.dc.gov/page/dcplug>
such as no electromagnetic radiation.
On your second link it seems that DC stands for "district of Colombia" :-)
In <gu9k9h5s2dar7i7h53496dfoj195ciu7l1@4ax.com> Jeff Liebermann <jeffl@cruzio.com> writes:
[snip]
Hardly. I prefer my power delivered as DC as Edison and the other >>patriarchs of power transmission intended it. For a time (early
1970's), I had wall outlets that delivered 12V DC[1].
Parts of NYC had DC utility power as late as the 1990's. While Con Ed >stopped new hookups 1960ish, they kept the legacy wiring live
a lot longer.
My 6 story apartment building with 28 apartments had regular AC,
but _ALSO_ had DC coming in for the elevator (a pretty common
situation) and ... had an "unmetered" (flat rate) separate low current
feed dedicated for the fire alarm.
A friend of mine lived in a similar apartment building
on 110th and Columbus Ave 1975ish, and believe it or not...
the rooms there had standard outlets, some of which
provided, sit down for this... 120V **DC**. Yes, identical.
We figured it was cheaper for the landlord to pay off the
building inspectors than to rewire...
Note that since we're talking 1975 (and earlier),
people had many appliances (basically incandescent
lamps) which would, indeed, work ok. But don't
plug in your record player.
would arc weld the power plug to the receptacle. Running AC wall
switches on DC had the same problem. DC connectors and switches were
too expensive, so I gave up.
Would the liquid mercury based wall swiches (remember them?) have
worked ok?
In <gu9k9h5s2dar7i7h53496dfoj195ciu7l1@4ax.com> Jeff Liebermann <jeffl@cruzio.com> writes:
[snip]
Hardly. I prefer my power delivered as DC as Edison and the other >>patriarchs of power transmission intended it. For a time (early
1970's), I had wall outlets that delivered 12V DC[1].
Parts of NYC had DC utility power as late as the 1990's. While Con Ed >stopped new hookups 1960ish, they kept the legacy wiring live
a lot longer.
My 6 story apartment building with 28 apartments had regular AC,
but _ALSO_ had DC coming in for the elevator (a pretty common
situation) and ... had an "unmetered" (flat rate) separate low current
feed dedicated for the fire alarm.
A friend of mine lived in a similar apartment building
on 110th and Columbus Ave 1975ish, and believe it or not...
the rooms there had standard outlets, some of which
provided, sit down for this... 120V **DC**. Yes, identical.
We figured it was cheaper for the landlord to pay off the
building inspectors than to rewire...
Note that since we're talking 1975 (and earlier),
people had many appliances (basically incandescent
lamps) which would, indeed, work ok. But don't
plug in your record player.
would arc weld the power plug to the receptacle. Running AC wall
switches on DC had the same problem. DC connectors and switches were
too expensive, so I gave up.
Would the liquid mercury based wall swiches (remember them?) have
worked ok?
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