Insert the jack plug of the grounding lead into the dedicated
socket ("ground", "ground icon") and at the same time run the
grounding lead alongside the case to the back. Touch the "AC" or
"DC" socket with your finger in order to bring your own body to
ground potential. Picture 07
Picture 07
Picture 08
Picture 09
Picture 10
Caution:
In case the grounding lead runs in front of the instrument case or a finger is between the
DC socket and the front of the instrument case, testing results will become distorted. (See also
footnote 1)
2. Positioning of the Field Meter for AC Electric Field Testing
The field meter is calibrated for measurements taken in close proximity to the body (Picture 11).
The field sources located behind the field meter are shielded through the body. Therefore mislea-
ding concentrations of field lines onto the electric field sensor are avoided. Therefore try to avoid
taking measurements with a stretched-out arm. In general, this would lead to higher testing results
(Picture 12). This type of distortions can be reduced or avoided by placing a conductive surface
behind the field meter. (Picture 13, see also footnote 1)).
Picture 11
Picture 12
Picture 13
1)
The electric field strength measured with ground reference always depends on the geometry of the field source and the sensor, the distance
between sensor and field source as well as ambient potentials. Following TCO guidelines, the ME 3951A is calibrated according to the TCO-
calibrated field meter "Radians Innova - Enviromentor EMM-4 (Serial. No. 4348)" at a distance of 50 cm from a 4-sqm large copper plate ope-
rating at 50 Hz and 270 V. Instead of a person, which is also grounded during testing in the field, a grounded, square copper plate measuring
50 cm (ca. 20") on its sides is placed behind the field meter during calibration. The same procedure is recommended for reproducible tripod
measurements. Testing results of the ME 3951A can only be expected to correspond with those of an original TCO sensor when the distance
from the field plate is greater than 30 cm (12"). The measured field strength represents a spatial integral across the testing equipment, whose
simplification "measurement value in the direction of the highest display = resultant field strength" is a good approximation for practical purpo-
ses.
10
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Measurement Instructions
GIGAHERTZ
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