TES TES-593R, Инструкция по эксплуатации, Страница: 16 / 32

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4-3 Use E-field sensor
The actual 3-channel sensor is located in the head part of the
meter. The three voltages generated by the sensor are fed back
to the meter. In far-fields, an E-field sensor is preferable due to
the greater bandwidth. The E-field sensor for frequencies is from
10MHz to 8GHz.
The meter is a small portable instrument that measures the electric
field presented in the atmosphere of the measurement sensor
surroundings.
The measurement of the field is done by moving the aerial of the
sensor in the desired measured environment.
You obtain a direct wide band measurement of the field that the
measurement sensor is subjected to. To find the value of the
field emitted by a source of interference, simply point the aerial
towards it and get as close as possible (the value of the field is
inversely proportional to the distance of the sensor/emission
source). The operator must take care not to be between the
source of disturbance and the zone to be checked: the human
body shields electromagnetic fields. The E-field sensor is
isotropic, it does not require special handing. Its sensitive part
measures the field according to 3 axes without the aerial having
to be moved in the 3 planes. Simply point it at the target to
make the measurement.
4-4 Explanatory notes
4-4-1 Units of measurement
The meter measures the electrical component of the field, the
default units are those of electrical field strength (mV/m, V/m).
The meter converts the measurement values to the other units
of measurement, i.e. the corresponding magnetic field
strength units (
µ
A/m, mA/m) and power density units (
µ
W/m
2
,
mW/m
2
, W/m
2
,
µ
W/cm
2
or mW/cm
2
) using the standard
far-field formulate for electromagnetic radiation.
The conversion is invalid for near-field measurements, as
there is no generally valid relationship between electrical and
magnetic field strength in this situation. Always use the default
units of the sensor when making near-field measurements.