Gigahertz Solutions ME 3951A Bedienungsanleitung Seite 11

the measurement of the total pollution. However, in order to obtain
valid results, this method requires a great deal of know how, the use
of a non-conductive holder (e.g. the PM5 by Gigahertz Solutions),
three measurements in the three dimensional axes XYZ and the vec-
2
torial addition of their results.
More adequate for the most important task, which is the identifica-
tion of the sources of pollution, would be an earthed measurement,
though, which is why this procedure is especially recommended for
the private use. For more information about the NFA1000 which is
specifically designed for this task please see our website.
Recommended Exposure Limit AC Electric Field:
Below 10 V/m, preferably below 1 V/m
(at 50/60 Hz for grounded measurement)
For potential-free measurement: below 1.5 pref. 0.3 V/m
For frequencies above 2 kHz significantly lower readings are to be desired.
Measurement Instructions –
Magnetic Fields:
Turn on the field meter and set the switch "Field Type" to "M" for
AC magnetic field. Set the filter to "50 Hz". The field meter does not
need to be grounded, persons present do not affect the testing re-
sults and there is no need to hold the meter close to your body.
Proceed as follows:
Move slowly through the room to be measured with special regard
to the sleeping or working place.
There is no need to turn the meter into different directions like for
the E-field, instead check all three orientations from time to time
as shown in the following pictures.
In practice it is usually sufficient to "rotate" the meter out of your
wrist until you have the position / direction of the highest read-
ing (see pictures on next page). In this direction the meter shows
the so-called "resulting" field strength resp. magnetic flux
density.
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Resulting total field strength = square root (x² + y² + z²). Simplified calculation is
possible by finding out the position / direction of highest reading as described in
the next chapter for the magnetic field. The above formula is also valid for the cal-
culation of the "3D" magnetic field.
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Made in Germany
Some guidelines recom-
mend the so-called "po-
tential-free" measurement
of electric fields, i.e. with-
out needing to ground the
meter. A potential-free
measurement is, in prin-
ciple, very adequate for
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