Properties Of Hf Radiation And - Gigahertz Solutions HFW59D Instruction Manual

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Checking Battery Status
If the "Low Batt" indicator appears in the center of the display,
measurement values are no longer reliable. In this case, the bat-
tery needs to be charged.
If there is no display at all upon switching the analyser on, check
the connections of the rechargeable battery. If that does not help
try to insert a regular 9 Volt alkaline, (non-rechargeable) battery.
If a non-rechargeable battery is used, do not connect the ana-
lyser to a charger / AC-adaptor!
Note
Each time you make a new selection (e.g. switch to another
measurement range), the display will systematically overreact for
a moment and show higher values which will, however, droop
down within a couple of seconds.
The instrument is now ready for use.
In the next chapter you will find the basics for
true, accurate HF-measurement.
Properties of HF Radiation...
This instruction manual focuses on those properties that are par-
ticularly relevant for measurements in residential settings.
Across the specified frequency range (and beyond), HF radiation
causes the following effects in materials exposed to it:
1. Partial Permeation
2. Partial Reflection
3. Partial Absorption.
The proportions of the various effects depend, in particular, on the
exposed material, its thickness and the frequency of the HF radia-
tion. Wood, drywall, roofs and windows, for example, are usually
rather transparent spots in a house.
Minimum Distance
In order to measure the quantity of HF radiation in the common
unit "power density" (W/m²), a certain distance has to be kept
from the HF source.
For measurements in the lower frequency limits of the HFW59D,
the minimum distance between the antenna tip and the object of
measurement should be half a meter.
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