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Measurement Basics
As the field strength increases when coming closer to sources of EMF
pollution, it is possible to locate these by following the higher read-
ings until reaching the emitting source. The tone signal provided fa-
cilitates this process. As fields (especially magnetic fields) can pene-
trate even massive construction material, the sources might even be
located outside the building, e.g. high-tension power lines, electrified
railway trails, transformers as well as neighbouring houses and apart-
ments.
Ideally, all measurements are to be repeated during various times of
the day and on different days of the week in order to identify fluctua-
tions. The SBM recommends a long-term recording of the magnetic
flux density for 24 to 48 hours. This can for instance be performed by
our NFA30M.
Function Testing
Magnetic Flux Density
Electric Field Strength
Turn on and select: Field Type = "E"
Measurement Range = "200 nT/Vm"
Frequency Range = "5 Hz–100/400 kHz"
Keep the field meter steady while tapping the front of the
case with your fingers – readings must jump up.
Defining the Offset:
Set the switch "field type" to the "Test" position. On the
left-hand side of the display a "1" will appear, and on the
right-hand side either "00.0" or "000", depending on the
selected measurement range. A higher measurement
value reflects the current additional tolerance of the instrument.
Choice of measurement range
General rule: as coarse as necessary – as fine as possible. Over-
flow will be shown by the vertical bar in the left segment of the LCD.
© Gigahertz Solutions GmbH
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Turn on and select: Field Type = "M"
Measurement Range = "200 nT/Vm"
Frequency Range = "5 Hz–100/400 kHz".
Move the field meter in fast and short movements
around its longitudinal axis back and forth – readings
will jump up (induced by the Earth's magnetic field).
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