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Trifield Natural EM meter review.. sort of

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12:00 am
October 24, 2009


Learjet

Australia

Lead Investigator

posts 1122

As we see this meter frequently used on GHI and DT, I went ahead and bought one to test and see what all the fuss was about. On some shows it seems as popular as the K-II is on the original GH show.

Not sure why but both GHI and DT tape over the trademark. Maybe they don't want to give it free advertising like GH do with the K-II?

I'm also by no means an expert with this meter, so I am learning as I go. Static magnetic fields and static electric fields are still mysterious to me. I have had more time with AC EM fields and understand them a lot better. So if anyone can chime in with extra information or correct me when I go wrong that would be great. This meter is a lot more tricky to use than a K-II, and more expensive also.

The beast… and the meter. http://yfrog.com/0ymeter5j

The front. http://yfrog.com/0ymeter3j

The guts. http://yfrog.com/0ymeter4j

On the front are several settings to choose from – Off, battery test, magnetic, sum, electric, radio/microwave. There is a big moving coil meter for measurement and a geiger counter like buzz with adjustable squelch with a knob on the side.

This meter is one of three variants that I know of. There's one for AC magnetic and electric fields and two variants of the Natural EM model. Model 1 which is the one I have and model 2 which has an extra jack for an external sensor, a jack for external power and a different sum function with the mode selector. No pretty LEDs on this one.

To be continued after dinner….

OD'd on EMF

4:51 am
October 24, 2009


Learjet

Australia

Lead Investigator

posts 1122

Let's have a look at each setting, what they are supposed to do, how to use it properly and also the incorrect ways of using the meter which can lead to false positives.

When set to magnetic, the meter is supposed to detect fluctuations in the magnetic field around it. The procedure for this, is to set the meter down and allow 30 seconds for warmup and settling time. Unless you're made of stone, you can't do it handheld. It has to be stationary, or at least remain parallel to the magnetic field lines. Rotating the meter just a couple of degrees sets it off.

Destination Truth has got my attention with this. They are walking around with the meter set to magnetic and get all excited when it goes off. To me this just means they are not walking straight! Watch for these mistakes  in these shows.

Okay on magnetic still, the meter is set down, proper settling time is allowed for and the audio buzzer squelch is set to mute the sound. You step back and ask if Casper is present. Buzz goes the meter. A ghost! Well no, not so much. To put it simply, the meter frequently goes off on it's own with natural fluctuations of the magnetic field. How often this happens depends on how the mute is set. The potentiometer with bare metal shaft coming out the side is incredibly fiddly to set. When set near the threshold, fluctuations of just 0.5 microtesla will activate the buzzer. Watch for this mistake on GHI. 

On the plus side, the magnetic setting generally ignores AC fields, and I haven't been able to get a cell phone to activate it. A radio transmitter will but it has to be high power or close to it. I would say it's much less sensitive to such devices than the K-II.

It will detect a magnet passed 3 feet away, a pocket radio at similar distances or anything that contains ferrous metal like a wrench or spanner. The advantage over a compass is that it can see "through" strong magnetic fields around it as long as the meter is allowed to self calibrate. For instance I can place a strong magnet near the meter, allow it to calibrate and then go on to find weaker fields.

The "electric" setting is one of the most fun to use. If set carefully, depending on the clothing I'm wearing it can detect my presence within a radius of about 2 metres, or around 7-8 feet. It also detects my cat Lol. I did notice it also activated when placed on a table with the wind blowing. Apparently the slight movement of the table cloth in the breeze was creating an electrostatic charge. It will be fun to observe in an electrical storm. Other than that, I haven't noticed much that when set in a calm spot can set the meter off. I haven't seen any TV shows use this meter set to electric yet. Cell phones don't seem to activate it at this setting.

The "sum" setting is just a combination of electric plus magnetic field. If either field changes the meter will activate, but there's no indication of which one was responsible.

The "radio/microwave" setting is also interesting. At this setting the meter has a sensitivity of 100 KHz to 2.5 GHz. Detects walkies, cell phones (should glue one to Grant) bugs, hidden transmitters, computers, TV's and all manner of devices in this frequency range. At this setting it can also be used as an AC EMF meter, of sorts. It doesn't pick up the primary 50/60 Hertz AC but rather high band harmonics. I'm not sure how, but it can also detect power points and switches (with house power still connected) without devices plugged in or turned on!

All in all an interesting meter. Only had it a few days and it has been a good source of amusement.

I'm sure the average ghost hunter will make all of the above mistakes and find lots of ghosts. And watch those TV shows for the same mistakes!

OD'd on EMF

5:59 am
October 24, 2009


alicat

Lead Investigator

posts 1215

Thanks Learjet.  Very interesting guide to the meter.  Sounds like you've been having a lot of fun testing it these past few days.  Keep us up to date on additional findings.  I can relate to you being able to detect Satan on the electric setting.  With all the static electricity in the air around here at certain times of the year, there are always sparks flying around here with pets/people getting zapped.  I'll be keeping my eyes more open while watching these shows now with your information.  By the way, it looks like Satan needs an agent or at least a percentage. Smile

7:56 am
October 24, 2009


Angelayo1970

Sysematically breaking all my new year's resolutions

Investigator

posts 162

Awesome info, Learjet! So, am I correct in assuming that TAPS uses it on the magnetic setting? And if this is correct, why that setting as opposed to any of the others?

"In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual." -Galileo Galilei

8:53 am
October 24, 2009


Learjet

Australia

Lead Investigator

posts 1122

I've only seen Destination Truth and GHI use the meter on a semi-regular basis. Britt might have used one on GH a few episodes back. From the video clips I've seen, DT and GHI had it set to magnetic. On this setting it's acting as a magnetometer. Casper just needs to be able to distort the magnetic field ever so slightly to register, but so does solar radiation. The problem here is that of all the professional magnetometers in use around the planet, ghosts have been known to activate none of them.

I would presume that spook hunters like the meter on this setting because solar radiation mimics an "EMF spike" and thus the self deception is complete.

OD'd on EMF

4:48 pm
October 24, 2009


Angelayo1970

Sysematically breaking all my new year's resolutions

Investigator

posts 162

Is there some sort of "theory" in the paranormal community that would make the magnetic setting more desirable, or do you think it's merely for the "easily faked" reason?

"In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual." -Galileo Galilei

9:10 pm
October 24, 2009


Learjet

Australia

Lead Investigator

posts 1122

I guess one could ask the same about the K-II and many other ghost hunting tools. IMO the equipment that produce the most "anomalies" are the favourites. It's ghost by inference.

Did you know that some paranormal websites have links to solar-xray and geomagnetic field stats?! You see, paranormal activity is linked to solar activity. Funny that.

This leads to theories that sprout off from equipment anomalies which are misinterpreted in the first place!  It's a slippery slope all the way down where two wrongs make a right. Welcome to ghost hunting.

P.S. Solar activity is up today and the meter does seem more active.

OD'd on EMF

6:01 pm
November 5, 2009


Orion

The Mundane Plane

Investigator

posts 105

Angelayo1970 said:

Is there some sort of "theory" in the paranormal community that would make the magnetic setting more desirable, or do you think it's merely for the "easily faked" reason?


Actually, there is.  I'm not entirely sure, but I think parapsychologist Loyd Auerbach started it.  He started out using all kinds of environmental testers and found a correlation in paranormal activity and small changes in the geomagnetic field.  The EM Natural was the preferred meter.. lately I see him with the regular (AC) Trifield, which I don't quite get.  It's not sensitive to pick up the geomagnetic field and also the frequency response of the regular Trifield is too high, unless you waved it around frantically maybe  ;)

Personally, I don't seem to register much on my EM Nat unless I wave my hand directly over the thing. It's kind of frustrating, actually! Same goes for my wife, though my son reads higher.

For Magnetic mode, I can sort of walk around with it (in magnetic mode) so long as I:

A) Walk verrrry slowly, deliberately, and try not to turn the meter at all.  You definitely can't use it like a regular EMF meter though. And doing this all through a strange, dark building would be really really tough, if not impossible.

B) Ignore the smaller, tinier fluctucations or measurements, like under a couple of µTesla. I guess I'm looking for that big hit!  lol Laughing

Maybe I shouldn't be doing the above, but I'll keep trying both ways. 

I don't knock regular AC meters as much as I used to though – as Learjet has pointed out elsewhere here, simply waving a permanent magnet by an AC meter will usually trigger it, it doesn't have to be a 50Hz or 60Hz signal for them to see it. My lowly Gaussmaster can go as low as 20Hz, not too shabby.

The one thing I wish the EM Natural had was some sort of unit ticks or delineation for that "squelch" knob, so you could set it and make note of exactly where it was for future reference or logging.  I might just do that myself – slap a small knob over it with some kind of indication.

Having an open mind is a two way street.

7:41 pm
November 5, 2009


Learjet

Australia

Lead Investigator

posts 1122

Agreed about the knob. I ended up putting one on mine because that pot shaft is just too skinny. The knob is similar in size to the one on the front.  It's a little easier to set now but I reckon it needs a second sub trim like a micro fine focus on microscopes.

"B) Ignore the smaller, tinier fluctucations or measurements, like under a couple of µTesla. I guess I'm looking for that big hit!  lol"

Actually I agree. A big hit over natural fluctuations is the one we want. Otherwise it could  just be background noise.

OD'd on EMF

1:25 pm
November 15, 2009


Orion

The Mundane Plane

Investigator

posts 105

Well, I just learned one more thing about the EM Natural.

I wrote to Alpha Labs (again) and asked about the components of the EM: is it built around an inductor, like typical EMF meters, or does it employ a hall effect sensor?

I was hoping for the latter.  But nope.  It's just an inductor, albeit one that is far more sensitive, they say.

Full fledged geomagnetometers, I believe, use hall sensors though, like the $750 USD one on lessemf.com

Having an open mind is a two way street.

7:12 pm
November 15, 2009


Learjet

Australia

Lead Investigator

posts 1122

Which I guess explains the model 2 variant where an external inductor can be plugged in, switching out the internal.

At some stage I might look into building some magnetometers with data logging. Not for paranormal use, but for monitoring geomagnetic storms for radio propagation prediction. That will probably go on the "things to do" list which never get done lol.

OD'd on EMF

9:07 am
November 30, 2009


AbsoluteTerrorField

Charlotte, NC

Investigator in Training

posts 23

In dealing with the Trifield I've played with these things on occasion. The walking around and holding it method like I've seen on GH and DT definitely is the best way to get false readings as it's quite sensitive to movement when set on magnetic. Who would have thought, eh? I would dare say that if you were going to use one of these to investigate anything then you'd have to find a stable position and leave it to sit. For me personally to take any readings from this seriously then it would have to be under conditions that would be like those I mentioned. Then again it's all theory as we all know. Just my two cents thrown in on it.

3:28 pm
November 30, 2009


Orion

The Mundane Plane

Investigator

posts 105

AbsoluteTerrorField said:

In dealing with the Trifield I've played with these things on occasion. The walking around and holding it method like I've seen on GH and DT definitely is the best way to get false readings as it's quite sensitive to movement when set on magnetic. Who would have thought, eh? I would dare say that if you were going to use one of these to investigate anything then you'd have to find a stable position and leave it to sit. For me personally to take any readings from this seriously then it would have to be under conditions that would be like those I mentioned. Then again it's all theory as we all know. Just my two cents thrown in on it.


Correct, which is why it shouldn't be handled exactly like that.

However, in magnetic mode, if you A) keep it aligned with magnetic north/south and B) walk very slowly and carefully,  it is possible. It's the meter cutting across geomagnetic lines of force that trigger small hits.  I get a max deflection of about 1 or 2 uT from this though, nothing significant. 

I'd like to make a gravity rig of some kind for this meter, like they use for Hollywood steady cams. Something that'd hold it out about 4 feet in front of you, and swivel to keep the orientation the same and absorb shocks and rapid movement. 

Other than that,  I think it's handy to just sit it down near a voice recorder when doing an EVP session.

Actually, the whole single meter thing is too haphazard anyway, I think.  Finances permitting, I'd rather be casting an electronic net, with tens of sensors placed in a grid over an entire room, each one linking back to a central computer which is logging all the info.

Having an open mind is a two way street.

3:37 pm
November 30, 2009


Nosfer

Rotaredom

Moderator

posts 2956

Actually, the whole single meter thing is too haphazard anyway, I think. Finances permitting, I'd rather be casting an electronic net, with tens of sensors placed in a grid over an entire room, each one linking back to a central computer which is logging all the info.

Nice to see this idea finally catching on…don't expect any of our SyFy friends to try it out soon, though. This was one thing that made me take note of Ghost Lab, I said "Finally" when I saw them lay out the line of them. Not quite the manner I would have but a far cry to what we've seen in the past.

I also recommended pairing each one with at least a recording thermometer/humidity sensor. Humidity to a lesser extent, but if you can collect the data simultaneously, why not!

Legal: The content of this post is copyrighted and is intended exclusively for use on skepticalviewer.com It may not be copied, distributed, or redisplayed on any other site without the express written consent of the author.

3:41 pm
November 30, 2009


AbsoluteTerrorField

Charlotte, NC

Investigator in Training

posts 23

I agree with your electronic net idea Orion. For whatever reason it's not letting me quote you and then reply. It's something should financing permit as well I'd like to try out. I'm more of the sit back and wait type when it comes to investigation. Maybe I'm weird, but my ideal investigation would be to create a grid of EMF, temperature equipment, etc just to see what comes up. After that I sit back and observe. Should a 'free floating mass' of electromagnetic energy occur then it would be a rather simple process of tracking it as it moves (if it does). I've never been one to buy into the single meter ideal, but I also understand that some of these meters are rather expensive and buying enough to create an effective grid like setup would be rather costly depending on the size of the area that you were investigating.

5:49 pm
November 30, 2009


Orion

The Mundane Plane

Investigator

posts 105

Oh man, I can't imagine buying 40 EM Naturals..    $$  ouch!   ;)

I think a custom made net outfitted with maybe 40 "nodes" or "sensor clusters" would be logical though.  EMF meters aren't a lot more than just inductor coils; when magnetic flux cuts across the coil, it induces a small voltage/current.  That's then used to deflect the needle of an analog meter or drive a digital display.  Of course, you wouldn't need those last components with the net, that'd be left up to the computer, so all you really need is the coil and maybe some filtering and a little amplification to avoid attentuation in getting the signals to the computer. 

I think I'd rather have triple axis sensor clusters for each "node" of the net, to get a better overall picture of a .. say, moving EM field. Again though, pricey.  Maybe single axis would work, just point 'em all up, and lay the net on the floor.  Hmm.. or maybe it'd be better to suspend the "net" from the ceiling where possible, like about 6.5 or 7 ft up, w/ sensors pointed down (if single axis).  That way there'd be no "crunchies" if someone coporeal inadvertantly walked in the room.  Wink    You could probably even use those removable hook things you see advertised on TV now and then, the ones with the sticky putty, along the walls to support the net; they hold strong but come off clean when you're done.

Either way, it'd be nice.  Briefly, I thought about making them wireless but.. nahh..  then you'd have to battery power every node, and deal with all the EMF and RF that'd generate too. Better to just wire 'em up.

I so have to hit the lottery now!

I totally agree Nosfer, that was the one thing about Ghost Lab that impressed me, and they did that early on.  I got kind of excited when I saw that, but then realized they hadn't really developed the idea any further.  What a shame!  Adding thermometers, barometers, etc.. would definitely be a nice touch too.

Having an open mind is a two way street.

2:04 pm
December 1, 2009


Learjet

Australia

Lead Investigator

posts 1122

It's a lot of trouble to go to if this whole EMF thing is just a wild goose chase, which it probably is.

In any case, rather than using many deaf as a post meters or sensors it might be a better idea to use a single super sensitive magnetic induction loop antenna, like this one. http://www.vlf.it/minimal/minimal.htm

See, there's even wild geese in the photo at the bottom so we must be on the right track. Undecided

Apparently this thing would hear a ghost fart on the other side of the Earth's geomagnetic field so detecting a ghost in a room should be S9 +60dB should they exist.

I was going to build one at one stage for Schumann Resonances, even bought 2 low noise OP27 opamps from Hong Kong but lost interest soon after, probably due to the amount of enamel copper wire needed (1500 – 3000 metres!) for the loop.

OD'd on EMF

2:11 pm
December 1, 2009


Nosfer

Rotaredom

Moderator

posts 2956

Might not this be considered overkill, though :) I didn't go through it all, but I think triangulation and movement detection would be a bit tricky with just one?

Legal: The content of this post is copyrighted and is intended exclusively for use on skepticalviewer.com It may not be copied, distributed, or redisplayed on any other site without the express written consent of the author.

3:40 pm
December 1, 2009


Learjet

Australia

Lead Investigator

posts 1122

It's not for triangulation, unless you make 3. I was thinking more along the lines of getting a good look at any "anomaly" deep into the background noise first, to see if anything is worth a second look. But yeah it's possibly slightly overkill. A much shorter induction coil like I presently use would likely be sufficient for a room. 

The way I see it, primitive EMF sensors are no better than a light/lux meter. What would you rather use, a room filled with Lux meters or a single "camera" ?

Or use one of these for measurements of magnetic fields in 3D. Have a look at page 4 of the PDF. http://www.spectran.com/test_report/Spectran5000-E.pdf

"All SPECTRAN® EMF measurement devices can measure
magnetic fields directly in 3D! Starting with the SPECTRAN® NF-
1010E, field strengths of the individual X, Y and Z axes can even be shown
seperately"

"It allows measurement of magnetic fields in all 3 spacial dimensions."

OD'd on EMF

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