Gigahertz Solutions HF32D Mode D'emploi page 10

Made in Germany
Control Elements and Quick Start Guide
Connecting socket for antenna cable. The anten-
na is inserted into the "cross like" opening at the
front tip of the instrument. Important: Do not bend
the cable too sharply or overtighten the connector
screw!
„Power" On/Off
„Signal" For building biological assessment use „peak"
ry setting in the HF32D)
„Range" Set the sensitivity according to the level of radiation
(
HF35C only)
All meters include an Auto-Power-Off-feature and a Low-Batt
indication.
Introduction to Properties of HF Radiation and
Consequences for their Measurement
Permeation of many materials
In particular for measurements inside of buildings it is important to
know that construction materials are permeable for HF radiation
to a varying degree. Some part of the radiation will also be reflect-
ed or absorbed. Wood, drywall, and wooden window frames, for
example, are usually rather transparent spots in a house.
Polarisation
Most High Frequency radiation ("waves") is vertically or horizon-
tally polarised. With the antenna attached the meter measures the
vertically polarised component, if the display is positioned hori-
zontally. By rotating the meter around its longitudinal axis you will
be able to pick up any polarisation plane.
Fluctuations with regard to space and time
Reflexions can cause highly localised amplifications ("hot spots"),
in particular inside buildings.
In addition, most transmitters and cellular phones emit with con-
siderably varying power during a given day and in the long term,
depending on local reception and load. Therefore repeat meas-
urements at different times of the day on working days and at
weekends. In addition it may be advisable to repeat them oc-
casionally over the year, as the situation can change over-
night. As an example, a transmitter only needs to be tilted down
by a few degrees in order to cause major changes in exposure
levels (e.g. during installation or repair of cellular phone base sta-
8
English
switch
(
.
.
Volume control for audio analysis of digital HF
services
(HF35C only; the HF32D has a "Geiger counter" effect
proportional to the signal)
= "Off" )
© Gigahertz Solutions GmbH
(= facto-