Users manual
FA845
version 1.5
Envionic
14
Chapter 2 RF High frequency electromagnetic field
When this is selected, "RF" (Radio Frequency) will be visible at the upper left top of the
screen.
A suitable antenna must be connected. The AL700 antenna delivered together with the device
is a "LogPer" directional antenna, suitable for 700 MHz to 6000 MHz (6 GHz).
The measured value strongly depends on the position of the device i.e. its distance and angle to
the source of radiation, especially for indoor measurements. Radiation is generally not emitted
with the same strength in all directions.
In most indoor situation, the radiation is coming directly from the source but can also be
reflected by big objects (indoor or outdoor objects). The combination of direct and reflected
signals causes interference patterns. Due to interference the measured value can vary a lot,
even when the device is moved only about 10 or 20 cm. The interference pattern can also be
heard via the speaker.
The highest value measured is used to determine if the amount of radiation is acceptable. The
hold
mode makes it easy to determine the highest value measured when moving the device
through the room.
2.1 Measurement with LogPer antenna
Measurement position with LogPer antenna
This antenna is for the range 700 MHz to 6000 MHz (6 GHz).
The LogPer antenna should be pointed in the direction in which you want to measure.
In most cases, the 'triangle' of the antenna should be vertical, because most signals have
vertical polarization. The device itself will mostly be horizontal in these cases.
