Gigahertz Solutions ME 3851A Bedienungsanleitung Seite 10

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Measurement Instructions –
Electric Fields
Electrical fields can be measured "vs ground potential" or "potential
free"/"with floating potential". Both have their advantages and disad-
vantages. Over many years, the measurement "vs ground potential"
was the only one recommended by SBM. For a grounded measure-
ment of the electric field start by grounding the meter:
Unvarnished metal piping for water, gas or heating is especially ade-
quate for grounding with the grounding cable, if need be the included
grounding clamp will help making the contact. A large nail in the wet
ground of the garden is fine, too. Professionals can also use the earth
contact of a wall socket (caution: don't try this as a layman).
Turn on the field meter and set it to "E". Set the filter to "50 Hz", that
is including the mains frequency of 60 Hz up to 400 kHz. Keep the
meter close to your body. The further away from the body it is held,
or if it is even put down, the more the testing results tend to become
distorted into the higher range. During testing please make sure that
the person performing the survey, as well as anybody else present, is
located behind the meter. Proceed as follows:
 Move slowly through the room to be measured. Stop frequently and
take measurements pointing to all directions, incl. ceiling and floor.
 Move into the direction of the highest reading in order to identify
the field source.
 In locations of frequent use, such as in the bed or at a workplace,
check all directions as mentioned above until you have reached
the maximum reading at the spot where the body of the person
would be located.
 An EMR survey of sleeping areas should be conducted under
"sleeping conditions," with all electrical equipment turned on or off
as you have it at night. Under certain circumstances the electric
field strength might even be higher if these items are switched off!
measurement of the total pollution. However, in order to obtain valid
results, this method requires a great deal of knowhow, the use of a
non- conductive holder (e.g. our PM5), three measurements in the
8
Insert the plug of the enclosed grounding cable into
the dedicated socket of the meter
cable along the side of the case to the back (see
picture). Make sure that neither the grounding cable
nor the user's hand is in the front of the meter (fal-
sifies the reading!).
and run the
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 princi-
ple, very adequate for the
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