Publicité
Les langues disponibles
Les langues disponibles
you have it at night. Under certain circumstances the electric field
strength might even be higher if these items are switched off!
Some guidelines recommend the so-called "potential-free" meas-
urement of electric fields, i.e. without needing to ground the meter.
A potential-free measurement is, in principle, very adequate for 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 PM2 by Gigahertz Solu-
which is the identification of the sources of pollution, would be an
earthed measurement, though, which is why this procedure is es-
pecially recommended for the private use. For more background
information to potential-free measurements please see our web-
site.
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
Measurement Instructions –
Magnetic Field:
Turn on the field meter and set the switch "Field Type" to "M" for
AC magnetic field. (ME 3840B only: Turn the knob for the fre-
quency filter to "50/60 Hz"). The field meter does not need to be
grounded, persons present do not affect the testing results 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 re-
gard 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-
2
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
calculation of the "3D" magnetic field.
© Gigahertz Solutions GmbH
M a d e in G e r m a n y
tions), three measure-
ments in the three di-
mensional
axes
XYZ
(see figure on the left)
and the vectorial addi-
2
tion
of their results.
Far more adequate for
the most important task,
9
Publicité
