Measurement Probes; General; Using The Ef1 Probe; Using The Ef2 Probe - Chauvin Arnoux C.A 41 Notice De Fonctionnement

6. MEASUREMENT PROBES

6.1. GENERAL

The measurement of an electric field works on the same principle as an aerial which picks up a radioelectric
signal. The sensitive part of the aerial is a detection cell with a very low threshold. This DC signal resulting
from the detection is transmitted to the measurement instrument by a resistive line ensuring maximum
transparency that does not disturb the electrical field in wich the instrument and its aerial is immersed.
The EF1 probe supplied with the C.A 41 is
of the dual pole type.
The measurement is anisotropic; reception
is only via the vertical polarisation.
Consequently, the reception diagram in
the horizontal plane is circular.
In the vertical plane, the reception diagram
conforms to the pattern shown below.

6.2. USING THE EF1 PROBE

Because of the anisotropy of the measurement probe, during measurement in a given atmosphere, the
aerial must be moved in all planes, along all axes.
We recommend using the Record function which after inspection will give the minimum, maximum and
average values of the field measured.
Before switching OFF the recording, it is necessary to HOLD the measurement using the HOLD function.
This makes it possible to memorise the different parameters before exiting the field.
Not using the HOLD recording function before exiting the field would risk introducing into the memory
values outside the field which would introduce errors into the measurements.

6.3. USING THE EF2 PROBE

As the EF2 probe is isotropic, it does not require special handling. Its sensitive part measures the field
according to axes without the aerial having to be moved in the 3 planes. As for the EF1 probe (see above),
we recommend using the record function.
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