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EMF meters should be turned on throughout an investigation and whenever there is an unusual reading they should be cross referenced with any other instruments in use such as a digital recorder.
To get use to your meter I highly suggest that you use it around your home to measure electrical wiring, outlets, and yes even light fixtures. Yes older buildings buildings tend to collect more ghosts but older buildings also have older electrical systems that sometimes have bad wiring, unshielded wiring or ungrounded wiring thus leading to more false positive. My filling just dropped into the kitchen sink because I was laughing so hard while seeing this post. Everything you need to conduct a Paranormal Investigation ranging from beginner kits to the weathered professional with various budgets in mind.
The original TriField ® Meter combines all the features needed for fast, accurate measurements of electromagnetic fields. Depending on where the knob is set, the meter detects either frequency- weighted magnetic fields (two separate scales), or frequency-weighted electric fields in the ELF and VLF range. The magnetic section consists of three ferrite-core coils pointing in the X, Y, and Z directions and located in the geometric center of the meter.
In most homes and offices, a large fraction of the total magnetic field is at frequencies above 60 Hz. Radio and microwaves are composed of a particular combination of electric fields and magnetic fields that is self-sustaining. The AC magnetic section is identical to that of the standard TriField Meter and has several uses. The AC electric section is also identical to that of the standard TriField Meter and can be used to determine whether an AC line is hot or neutral, even through a wall. EMF Meter - Electromagnetic Field Meter or Gauss Meter at MyFamilyHealth com au 1300 780 764 Search Cart 0 Item Items (empty) No products Free shipping! Paranormal investigators believe that when you are in the presence of a ghost the readings will on the EMF detector will increase. While your at it get use to measuring other electronic equipment such as stereos, clocks and microwave ovens when in operation. Well so when your out ghost hunting you can deduce or decide whether you have a false positive reading! It independently measures electric field and magnetic field, and is properly scaled to indicate the full magnitude of currents produced by each type of field inside a conductive body.
It has significant sensitivity at 100,000 Hz, well past the 17,000 Hz horizontal scan of video displays.

In addition, the magnetic setting and the electric setting measure true magnitude, a feature found elsewhere only in more expensive meters. The few other meters below $200 read only low-frequency magnetic fields and only in one direction (not true magnitude).
Non-linear circuitry combines the signals of these three into a true magnitude of the field strength, independent of which direction the meter is pointed. Most often, this is caused by magnetic fields, which come largely from unpaired internal wiring. Because the meter housing is plastic, the electric fields can penetrate through to the plates, which are also arranged to detect AC electric fields in the X, Y, and Z directions. These include areas near improperly grounded equipment, the front of video screens, and fluorescent lights.
These include door seals around microwave ovens, and cellular phones (but not regular radio phones, which are very low-power).
For frequencies below about 100 MHz (100 million Hz) the principle effect on a conducting body is from the magnetic field part only. The signal is amplified and converted to a power density magnitude, calibrated at typical home microwave oven frequency (2 GHz). It can detect which of several wires or transformers is carrying current, and help determine appropriate placement of magnetically sensitive equipment. It can easily detect by proximity which side of a wall outlet or which wire of an extension cord is hot. It should be cupped in your hand this way it does not obstruct the sensitive sensors towards the top of the meter.
This gives you a good idea of the background levels of Electromagnetic pollution these devices generate. Once you get use to the meter it is more of an art that a science when drawing conclusions on a ghost hunt. If you hold the meter in the center of a room and tip it to various angles, the magnetic reading will stay approximately the same regardless of which way you tip or rotate it.
The magnetic section of the TriField meter has three field-detecting coils pointing in the X, Y, and Z directions. When the BATTERY TEST reads low, the battery can be replaced with any rectangular 9 volt transistor or alkaline (which lasts about 50 hours) type. Circuitry similar to the magnetic section converts the signals into an electric field signal which is frequency-weighted. Most of these fields can be easily shielded using a grounded metal screen or foil; VDT screens of this type are readily available. This is because the electric field component of radio waves produces much weaker currents in the body than does the magnetic field unless the wavelength of the waves is smaller than the height of the body.

This fills in the gap from 100 KHz to 50 MHz, which includes many amateur radio frequencies so that antenna radiation patterns can be measured. It can also detect improper grounding, as well as the extensive electric fields from video monitors and fluorescent lights. For the best readings it is highly recommended that you remove all jewelry such as rings, bracelets and watches that sometimes can interfere with the meter. Many greatful for keeping up the worth reading and really happy I came across this exclusive piece of information. The electric reading is similar, although the presence of your body alters the actual electric field, so readings will vary more. A circuit amplifies these signals and gives them the proper frequency-weighting (sensitivity increases linearly from 30 Hz to 500 Hz, but with some residual sensitivity up to 100 kHz).
Much of the total field strength is from frequencies that are harmonics or multiples of 60 Hz (120 Hz, 180 Hz, etc.) and 17,000 Hz of video displays. You can greatly reduce the strength of an electric field just by placing your hand in front of the source.
Low-frequency electric fields by themselves can be strong enough to create significant current, but only if they are from sources other than true radio waves. The Broadband detects magnetic fields up through 100 KHz, as does the standard TriField meter. It is used to detect ON-AIR status of transmitters (or to detect concealed transmitters), to check microwave ovens or other microwave equipment for leakage, and to look for RFI sources. The power density increases as the square of the field strength, and the field strength decreases as the inverse distance from the transmitting antenna. A unique network combines the three coil outputs nonlinearly to approximate a true magnitude.
Cars (especially near the front floorboard of electronic ignition cars) and motorcycles have fairly strong fields that are at frequencies higher than 60 Hz.
However, a flat frequency response version (50 Hz to 500 Hz) is also available for the AC magnetic section.
As mentioned, a true radio wave is a particular combination of electric and magnetic fields.
A version with flat frequency response (instead of linear sensitivity increase) is also available for the same price.

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