Gigahertz Solutions HF58B-r User guide

Contents
Functions & Controls 2
sets new standards in HF testing.
©
Professional Technology
Professional measurement engineering is
With the HF analyzers, GIGAHERTZ SOLU-
TIONS
Getting Started 3
Introduction to Properties and
Measurement of HF Radiation 4
Step-by-Step-Instruction
to HF-Measurement 5
Limiting values, recommendations
offered with a unique price/performance ratio
- the only one of its kind worldwide. This was
made possible through the consistent use of
innovative integrated components, as well as
highly sophisticated production engineering.
Some features have patents pending.
The HF analyzer you purchased allows a
and precautions 11
Audio Frequency Analysis 12
Analysis of the modulated / pulsed signal 13
Use of Signal Outputs 13
Battery management 14
Remediation and Shielding 15
Warranty 15
Conversion tables 16
Safety Instructions:
It is imperative to carefully study the instruction manual prior
to using the HF analyzer. Important information regarding
safety, use and maintenance is provided herein.
competent assessment of HF exposures be-
tween 800 MHz and 2.5 (3.3) GHz. From a
building biology perspective, this particular
frequency range is particularly relevant be-
cause cellular phones, cordless phones, mi-
crowave ovens as well as next-generation
technologies such as UMTS/3G or Bluetooth
and WLAN all make extensive use of it.
We appreciate the confidence you have
shown in purchasing this HF Analyzer. With
the confidence that your expectations will be
met, we wish you great success in collecting
valuable information with this HF analyzer.
If you should encounter any problems,
please contact us immediately. We are here
The HF analyzer should never come into contact with water or
be used outdoors during rain. Clean the case only from the
outside, using a slightly moist cloth. Do not use cleaners or
to help.
sprays.
Prior to cleaning the HF analyzer or opening the case, shut it
off and unplug all extension cords. There are no user-
serviceable parts inside the instrument.
Due to the high sensitivity level, the electronics of the HF
Canada and U.S.:
Enviratest Inc.
8 Settlers Court, Morriston, On, N0B 2C0
analyzer are very sensitive to heat, impact as well as touch.
Therefore do not leave the instrument in the hot sun, on a
heating element or in other damaging environments. Do not let
it drop or try to manipulate its electronics inside when the
case is open.
This HF analyzer should only be used for the purposes de-
scribed in this manual and only in combination with supplied
or recommended accessories.
www.enviratest.com
Other:
GIGAHERTZ SOLUTIONS GmbH, Germany
90579 Langenzenn
www.gigahertz-solutions.de
(to 3.3 GHz with additional tolerance)
HF-Analyser for Frequencies from 800 MHz
HF58B-r
to 2.5 GHz
Instruction Manual
Revision 4.5
expanded. You will find the current version at your local
distributors homepage or at www.gigahertz-solutions.de
Please carefully review the manual before using the device. It
contains important advice for use, safety and maintenance of
the device. In addition it provides the background information
necessary to make reliable measurements.
© by GIGAHERTZ SOLUTIONS GmbH, 90579 Langenzenn,
Germany. All rights reserved. No reproduction or distribution
© Gigahertz Solutions GmbH, 90579 Langenzenn, Germany Revision 4.5 (Febuary 2006) Page 1
in part or total without editor’s written permission.
Digital High Frequency Analyser HF58B-r
. set-
(Push and
.
1
.
2
antenna is inserted into the “cross like”
opening at the front tip of the instrument.
8) Connecting socket for antenna cable. The
optional amplifier or attenuator only. For
9) Power Level Adapter Switch for external
lated part of the signal, for Audio analysis
will shift the decimal point to an incorrect position.)
regular use of the instrument the switch
should be in pos. “0 dB“. (Any other position
via PC or headset.
battery. AC adapter for 230 Volt/50 Hz
is activated. In upper position
position . . .., the audio analysis mode
ting, you can additionally hear a signal
similar to a “Geiger counter”, propor-
10) ON/OFF switch. In middle switch-
and 60 Hz is included. For other Volt-
ages/Frequencies please get an equiva-
lent local AC adaptor with the output pa-
rameters 12 – 15 Volt DC / >100mA.
Caution: If an alkaline battery is used,
hold for 2 seconds or until the readings do not fur-
tional to the field strength
signal strength is displayed. In “Pulse”
mode, only the pulsed / amplitude modu-
lated part of the signal is displayed.
11) Signal fraction: In mode “Full“, the total
under no circumstances should the
power adapter be connected at the same
time, otherwise the battery may explode.
function“ to avoid unintentional discharge
of the battery
12) This instrument has an “Auto-Power-Off
(=19 990µW/m²)
coarse = 19.99 mW/m²
Scaling with external amplifier or damper is differ-
medium = 199.9 µW/m²
ent!
fine = 19.99 µW/m²
ther decrease )
13) Push button to reset peak hold.
Standard setting: “Peak”. In peak hold
width for the LF-Signal processing.
Standard setting: “TP30MHz”
14) Switch for choosing the Video Band-
mode you can choose a time setting for
the droop rate (Standard = Slow) With
the push button (pos. 13 ) you can manu-
ally reset the peak hold value.
Typical default settings of major functions are
marked yellow in the text above.
dicates the unit of the numerical reading:
bar on top = mW/m² (Milliwatts/m²)
For this feature the volume control should be turned
1
down completely because otherwise the sound mixes
bar on bottom = uW/m² (Microwatts/m²)
tional instruments, e.g. data logging de-
The instrument switches off after about 30 Minutes at
with the “audio analysis”. Similar to Geiger counter.
2
regular charging level of the battery and after about 3
Minutes when “Low Batt.” is displayed on the LCD.
vices(1 VDC full scale).
Functions and Controls
1) Volume control for the audio analysis.
2) Jack, 3.5 mm : AC output for the modu-
3) Jack, 12 – 15 Volt DC for charging the
Digital High Frequency Analyser HF58B-r
4) Measurement ranges
5) Selector switch for signal evaluation.
6) A little bar on the very left of the LCD in-
7) DC output, allows you to connect addi-
English printwork to follow!
The HF component of the testing instru-
ment is shielded against interference by
an internal metal box at the antenna input
(shielding factor ca. 35 – 40 dB)
© Gigahertz Solutions GmbH, 90579 Langenzenn, Germany Revision 4.5 (Febuary 2006) Page 2
Checking Battery Status
When the “Low Batt“ indicator appears in the
center of the display, measurement values
are not reliable anymore. In this case the bat-
tery needs to be charged.
If there is nothing displayed at all upon
switching the analyzer on, check the connec-
tions 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 con-
nect the Analyser to a charger / AC-
adaptor !
Insert fully charged batteries only.
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 that droop
down within a couple of seconds.
the antenna cable!
The instrument is now ready for use.
for true, accurate HF-measurement.
In the next chapter you will find the basics
. Do not remove
3
This SMA connector has gold-plated con-
tacts is the highest quality commercial HF
connector in that size.
Carefully check the tight fit of the connection
at the antenna tip. This connection, at the tip
of the antenna, must not be opened.
At the tip of the antenna, there are two LED’s
for monitoring the proper function of all con-
nections of the antenna and the cable during
operation. The red one checks the cable, the
green one the antenna itself.
Slide the antenna into the vertical / cross
Do not bend, break or stretch
shaped slot at the rounded top end of the HF
analyzer. Make sure the antenna cable has
no tension and lies below the instrument. It
may help to loosen the SMA-connector tem-
porarily to let the cable fall into a “relaxed”
position.
The antenna can be used by attaching it to
the top end of the HF analyzer or holding it in
your hand. When holding the antenna in your
hand, please ensure that your fingers do not
touch the first resonator or antenna conduc-
tors. Therefore it is recommended to hold it
at the opposite end. For a precision meas-
urement, the antenna should not be held with
your fingers, but be attached to the desig-
nated slot at the top end of the HF analyzer.
There are small ferrite-rolls fitted on the con-
them!
nectors of the antenna cable. They serve the
purpose of fine-tuning
Should they loosen they can be glued again with any
3
household glue
Digital High Frequency Analyser HF58B-r
Long and short switches
Some of the switches are recessed in the
casing of the instrument to avoid uninten-
tional switching for rarely used functions
Contents of the package
Instrument
Attachable antenna
NiMH rechargeable Batteries
(inside the meter )
AC-Adaptor
Several Adaptor-connectors
Comprehensive instruction manual
Check the HF analyzer and its antenna by
following the instructions under “Getting
Started.“
Getting Started
Connecting the Antenna
Screw the angle connector of the antenna
connection into the uppermost right socket
of the HF analyzer. It is sufficient to tighten
the connection with your fingers. (Do not use
a wrench or other tools because over tight-
ening may damage the threads.)
© Gigahertz Solutions GmbH, 90579 Langenzenn, Germany Revision 4.5 (Febuary 2006) Page 3
Measuring HF Radiation
When testing for HF exposure levels in an
apartment, home or property, it is always
recommended to record individual measure-
ments on a data sheet. Later this will allow
you to get a better idea of the complete
situation.
It is important to repeat measurements sev-
eral times: First, choose different daytimes
and weekdays in order not to miss any of the
fluctuations, which sometimes can be quite
substantial. Second, once in a while, meas-
urements should also be repeated over
longer periods of time, since a situation can
Polarization
When HF radiation is emitted, it is sent off
with a “polarization“. In short, the electro-
magnetic waves propagate either vertically or
horizontally. Cellular phone technology,
which is of greatest interest to us, is usually
vertically polarized. In urban areas, however,
it sometimes is already so highly deflected
that it runs almost horizontally or at a 45-
degree angle. Due to reflection effects and
the many ways in which a cellular handset
can be held, we also observe other polariza-
tion patterns. Therefore it is always strongly
recommended to measure both polarization
planes, which is defined by the orientation of
the antenna.
literally change “overnight.“ A transponder
only needs to be tilted down by a few de-
grees in order to cause major changes in
exposure levels (e.g. during installation or
repair of cellular phone transmitters). Most of
all it is the enormous speed with which the
cellular phone network expands every day
that causes changes in exposure levels. In
the future we will also have to deal with third
generation networks (e.g. UMTS/3G), which
are expected to increase exposure levels
considerably since their system design re-
quires much more tightly woven “cells“ of
base stations compared to current GSM net-
works.
Even if you only intend to test indoors, it is
Please note that the LogPer-antenna sup-
plied with this instrument is optimized for one
polarization only (vertical if mounted to the
instrument - even if the horizontal “wing”
suggests the opposite.)
Fluctuations with Regards to Space and
Time
Amplification or cancellation effects can oc-
cur in certain spots, especially within houses.
This is due to reflection and is dependent on
the frequencies involved. Most transmitters
or cellular handsets emit different amounts of
energy during a given day or over longer pe-
recommended first to take measurements in
each direction outside of the building. This
will give you an initial awareness of the “HF
tightness“ of the building and also potential
HF sources inside the building (e.g. 2.4 GHz
telephones, also from neighbours).
riods of time, because reception conditions
and network usage change constantly.
All the above-mentioned factors affect the
measurement technology and especially the
procedure for testing. This is why in most
cases several testing sessions are necessary.
Furthermore you should be aware that taking
measurements indoors adds another dimen-
Digital High Frequency Analyser HF58B-r
Introduction to Properties and
Measurement of HF Radiation
This instruction manual focuses on those
properties that are particularly 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 de-
pend, in particular, on the exposed material,
its thickness and the frequency of the HF
radiation. 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 radia-
tion in the common unit “power density“
(W/m²), a certain distance has to be kept
from the HF source. The distance depends
on the frequency – the higher the Frequency
At 27 MHz from ca. 27 meters
At 270 MHz from ca. 2.7 meters
At 2700 MHz from ca. 0.27 meters
the lower the distance. The transition fre-
quency between so called far field and near
field conditions is not determined exactly, but
here are some typical distances:
That means the distances are inversely pro-
portional.
© Gigahertz Solutions GmbH, 90579 Langenzenn, Germany Revision 4.5 (Febuary 2006) Page 4
does not matter if the angle gets a little too
wide.
The readings from the instrument’s display
reflect the integral power density in the “an-
tenna lobe”. (ie., the antenna is most sensi-
tive, with a rounded peak, to radiation from a
direction parallel to its axis with the sensitiv-
ity tapering off rapidly with increasing angle
Step-by-Step-Instruction to
HF-Measurement
Preliminary Notes Concerning the An-
tenna
The supplied logarithmic-periodic antenna (or
of incidence.)
The frequency range of the LogPer aerial
supplied covers cellular phone frequencies
(e.g. GSM800, GSM1900, TDMA, CDMA,
AMPS, iDEN), 2.4-GHz (DECT) cordless
phones, frequencies of third generation tech-
nologies, such as UMTS, WLAN and Blue-
tooth, as well as other commercial frequency
bands and microwave ovens. All the fre-
quencies in between are also included. This
is the frequency range which you would find
most pulse-modulated signals, concerned
scientists are worried about.
For monitoring of these critical sources of
radiation as conveniently as possible the fre-
aerial), has exceptional directionality. Thus
it becomes possible to reliably locate or “tar-
get“ specific emission sources in order to
determine their contribution to the total HF
radiation level. To know exactly the direction
from where a given HF radiation source origi-
nates is a fundamental prerequisite for effec-
tive shielding. Our logarithmic periodic an-
tenna, the “LogPer antenna”, provides a dis-
tinct division of the horizontal and vertical
polarization plane. Also the frequency re-
sponse is exceptional. There is a patent
pending for its design.
The missing directionality of standard tele-
scope antennae is one of the reasons why
they are not suited for reliable HF measure-
quency band of the LogPer aerial supplied
ments in building biology EMR.
together with the instrument has been limited
intentionally by its design to frequencies
above 800 MHz, i.e. frequencies below 800
MHz are suppressed. The suppression is
additionally enforced by an internal highpass
filter at 800 MHz. This reduces the disturbing
impact of most sources like radio broadcast-
ing, television stations or amateur radio on
the measurements to a minimum.
the emitting source one wants to
measure. This is to avoid distortions of the
Important:
As the LogPer Antenna provided with this
instrument is shielded against ground influ-
ences one should “aim” about 10 degrees
below
reading.
In order to measure frequencies below 800
MHz down to 27 MHz the instruments
HFE35C and HFE59B are available from Gi-
gahertz Solutions. They come with an active
The upper edge of the foremost resonator is
a good “aiming aid” for the required angle. It
Digital High Frequency Analyser HF58B-r
sion of testing uncertainties to the specified
accuracy of the used HF analyzer due to the
narrowness of indoor spaces. According to
the “theory“ quantitatively accurate HF
measurements are basically only reproduci-
ble under so-called “free field conditions”,
yet we have to measure HF inside buildings
because this is the place where we wish to
know exposure levels. In order to keep sys-
tem-immanent measurement uncertainties as
low as possible, it is imperative to carefully
follow the measurement instructions.
As mentioned earlier in the introduction, only
slight changes in the positioning of the HF
analyzer can lead to rather substantial fluc-
tuations in measurement values. (This effect
is even more prevalent in the ELF range.) It is
suggested that exposure assessments are
based on the maximum value within a lo-
cally defined area even though this particu-
lar value might not exactly coincide with a
particular point of interest in, for example, the
head area of the bed.
The above suggestion is based on the fact
that slightest changes within the environment
can cause rather major changes in the power
density of a locally defined area. The person
who performs the HF testing, for example,
affects the exact point of the maximum
value. It is quite possible to have two differ-
ent readings within 24 hours at exactly the
same spot. The maximum value across a
locally defined area, usually changes only if
the HF sources change, which is why the
latter value is much more representative of
the assessment of HF exposure.
© Gigahertz Solutions GmbH, 90579 Langenzenn, Germany Revision 4.5 (Febuary 2006) Page 5
.
4
Quantitative Measurement:
Settings
After having identified the relevant measure-
ment points following the instructions in the
previous section. The actual testing can be-
gin. Setting:
Set the “Signal Evaluation” switch to “Peak”
HF radiation exposure can differ at each
point and from all directions. Even though the
HF field strength of a given space changes
far more rapidly than at lower frequencies, it
is neither feasible nor necessary to measure
all directions at any given point.
Measurement Range Selection
Select the appropriate switch settings as
Since this is not an accurate quantitative
measurement, but a quick overview assess-
ment, the antenna can be removed from the
top end of the HF analyzer, for convenience.
described under “Quick Overview Measure-
ments“. Basic rule for measurement range
selection:
- As coarse as necessary, as fine as possible.
Holding the antenna at its very end as de-
scribed in “Getting Started”, the polarization
plane (vertical or horizontal) can easily be
changed with a turn of your wrist. However,
you can just as well use the HF analyzer with
Note:
the antenna attached to it.
Since there is no need to look at the display
To allow for as wide a range of power densi-
ties to be read out without using an external
attenuator, a factor of 100 lies between adja-
cent ranges. That means for example an ac-
tual value of 150 µW/m² will be displayed as
150.0 µW/m² in the range “Medium” and as
0.15 mW/m² in the range “Coarse”. Due to
technical reasons the tolerances of the in-
strument are relatively high in this overlap-
ping 1% of the next higher range
easy to walk slowly through in-door or out-
door spaces in question. In doing so con-
stantly moving the antenna or the HF ana-
lyzer with attached antenna, in each direc-
tion. This will provide you with a quick over-
view of the situation. In in-door spaces, an-
tenna movements towards the ceiling or the
during an overview measurement, you only
need to listen to the audio signal. It is very
floor will reveal astonishing results.
As already mentioned above, overview
Power densities of a few hundred µW/m², displayed
4
as 0.01 up to about 0.30 mW/m² in the setting
measurements are not meant to provide
accurate results, but to identify those
"Coarse", are those with the highest measurement
uncertainties as % of the actual values. On the other
zones within which local peak values are
found.
hand setting the switch to "Medium" activates an inter-
nal amplifier, which brings with it an additional wavi-
ness of up to +/- 1 dB, depending on the actual fre-
quency analysed. Worst case combined to worst case
could absorb almost +/- 3 dB, the maximum tolerance
of the instrument. For very small readings in "Coarse"
that could result in a factor of 4 difference of the corre-
Digital High Frequency Analyser HF58B-r
horizontally isotropic ultra broad band aerial
down to 27 MHz, the UBB27
In order to measure frequencies below 800
MHz down to 27 MHz the instruments
HFE35C and HFE59B are available from Gi-
gahertz Solutions. They come with an active
horizontally isotropic ultra broad band aerial
down to 27 MHz, the UBB27
Measurements for a Quick Overview
, and
This is helpful to gain insight into the overall
situation. Since the actual number values are
of secondary interest in this phase, it is usu-
ally best to simply follow the audio signals
which are proportional to the field strength.
(Set“ On/Off“ switch (“Mode” to:
turn down the audio analysis knob to low).
Procedure for the
Quick Overview Measurement:
The HF analyzer and antenna are to be
checked following the instructions under
“Getting Started.“
First set the measurement range (“Range
Selection”) switch to “Coarse”. Only if the
displayed measurement values are persis-
tently below ca. 0.10 mW/m², change to the
W/m²).
Note: When switching from the range
19.99mW/m² to 199.9µW/m², the volume of
the audio signal increases sharply. When
switching from the range 199.9µW/m² to
19.99µW/m² there is no difference in volume.
measurement range “Medium” (199.9µW/m²)
or to “Fine” (19.99 μ
© Gigahertz Solutions GmbH, 90579 Langenzenn, Germany Revision 4.5 (Febuary 2006) Page 6
An experienced measuring technician will be
able to obtain additional information from the
comparison of average and peak values. Ba-
sic Rule: The more the two measurement
values differ from one another (in 2.4-GHz
cordless phones the ratio can be as high as
1:100.), the higher is the potential of a contri-
bution from e.g. a 2.4-GHz cordless phone or
other pulsed signal source to the total maxi-
mum value.
Still today, some field meters only display
average values. They are of little help when
considering the potential health risks associ-
ated with pulse-modulated HF radiation since
through the “averaging“ of steep HF pulses,
HF radiation exposure can be underrated up
to a factor of 100, such as in 2.4-GHz cord-
less phones.
Signal Evaluation – Peak Hold
Many measuring technicians work with the
function “Signal Evaluation” “Peak Hold“. In
“peak hold” mode the highest value of the
signal within a defined time span can be ob-
tained /“collected”.
In order to obtain accurate readings you
must use the small black button on the meter
face labeled "Peak Hold Cancel. Failure to
clear the LCD display screen by pressing this
button, for two seconds, will result in inaccu-
rate readings. While this button is pushed
and held, the readings are regular "Peak"
readings. If any switch settings are changed
while measuring, and also in order to
start any new "Peak Hold" measurement, you
must always first hold this "Peak Hold Can-
cel" button for 2 seconds, then release it.
This will ensure accurate readings.
nW/m².
TPmax (Radar) : Approx. 1 nW/m²
TP 30kHz (Standard) : Approx. 0.1
resolution of 0.0001 µW/m², displayed as
0.01 Nanowatt/m². The actual minimum reso-
lution depends on the video bandwidth se-
lected. When the video Bandwidth Switch is
set to:
A list of all ranges, which can be measured
and displayed, is at the end of this brochure.
Setting:
Signal Evaluation
Signal Evaluation – Average / Peak
A pulsed signal consists of sections of its
time period with high output and another
sections with zero output. Their maximum
output is the wave peak. The following illus-
tration shows the difference in the evaluation
of a pulsed signal if displayed as an average
value reading or a peak value reading.
HF-energy in µW/qm
peak value: 10
. Theoreti-
5
e.g. 1 pulse every 10 µS
avg. value: 1
Note: The peak HF radiation value, not the
average value, is regarded as the measure-
ment of critical “biological effects“. The peak
value is displayed in the switch setting:
“Peak”. The average value is displayed in the
switch setting: “Average”.
Digital High Frequency Analyser HF58B-r
Rules of thumb for the interpretation of
the results
Readings in the two adjacent sensitivity
ranges “Medium” and “Coarse” use the
one with the higher value.
Numbers below 0.05 mW/m² shown in the
range “Coarse” are within the range of its
potential zero bias. Use the reading shown in
range “Medium”.
For comparative measurements (before /
after shielding) use the same range selector
position when possible.
Power densities beyond the designed range
of the instrument (display shows “1” on its
left side with the range set on “Coarse”) can
still be measured by inserting the attenuator
DG20_G3, available as an optional acces-
sory. By setting the “Adapter” switch to “At-
tenuator – 20 dB on your instrument ensures
the correct display of the measurement.
Also available are two HF preamplifiers for
factors 10 (HV10) and 1000 (HV30) as plug-
ins into the antenna input socket
sponding reading with setting "Medium". Numerical
example: In "Medium" you read 150.0 µW/m². In
cally the HF58B-r would have a minimum
"Coarse" you could read up to 0.6 mW/m² or down to
The power level adaptor switch is provided for the
0.03 mW/m² in an extreme case. Normally the differ-
ences shown will be much smaller.
5
factor HV10 amplifier only, not for the HV1000. The
HV1000, has the decimal point in its correct position.
The numbers are displayed in nanoW/m² instead of
µW/m² which is indicated on the LCD.
© Gigahertz Solutions GmbH, 90579 Langenzenn, Germany Revision 4.5 (Febuary 2006) Page 7
.
6
the range selector
setting TPmax and
“fine” the noise can be up to a value be-
tween 30 and 120 digits. The tolerance
level of bandwidth and associated noise is
wide, but the bandwidth is beyond 2 MHz
minimum. A high noise level indicates an
even higher bandwidth of the instrument
: In view of the unavoidable
Please note
higher noise associated with the high video
bandwidth one should not use TPmax as
standard setting.
standard default setting for general pur-
- TP30kHz (Standard): This should be the
pose use of the instrument. The video
bandwidth is about 30 kHz, which will rep-
resent the shortest continuously pulsed
signals (e.g. DECT) without distortion. At
the same time, even with the range switch
on “Fine” the noise is significantly less than
with TPmax.
When the setting “Tpmax” and “Peak Hold – slow” is
6
chosen the reading on the display will at first rise for a
few second or even minutes, as also minute stochastic
peaks will be picked up and retained, which in normal
processing would be just “averaged out”. After some
time some slightly varying state of equilibrium will be
established.
for measur-
ing radar and UMTS/3G signals, as along
with the high video bandwidth comes a
an unparalleled high value which guarantees
the best accuracy available on this sector.
Use the setting “TPmax” only
higher noise level as illustrated in the picture
higher noise
Video-
low Noise
below.
ideal for Radar
"high"
"low"
UMTS (3G) and
(e.g. 2 MHz)
(e.g. 30 kHz)
Radar readings
and UMTS (3G)
bandwidth
displayed too small
With this setting the full 2
MHz bandwidth is at your disposal. Select
this when you have identified Radar or a
UMTS/3G signal by audio analysis. Please
note that with this setting not only the
UMTS/3G and the Radar signals are
measured, also any signals from other
The standard setting therefore is “TP30kHz”.
Only if a Radar signal or UMTS (G3) signal is
detected, by means of the audio analysis,
the “Tpmax” setting is used.
Some technical background
The circuits processing the incoming high
frequencies are only a small fraction of the
total circuitry. Their output is a signal propor-
tionate to the power density in the frequency
of the modulations or the pulses of the in-
coming HF signal, i.e. an LF signal in the
broadest sense.
The video bandwidth is important for the po-
tential as well as the limitations of an instru-
ment. Your HF analyzer allows you to select
between two settings of bandwidth, depend-
- TPmax (Radar):
ing on the objective of the measurement:
sources in this frequency range. With this
Digital High Frequency Analyser HF58B-r
In everyday measurement practice this func-
tion has great value. The peak value is re-
lated to the actual signal situation. This is
important because the immission situation
can change rapidly with time, direction of the
radiation, polarization, and the points of
measurements.. The “Peak Hold” mode
guarantees that you do not miss single
peaks.
The tone signal works independently of data
collection in the peak hold mode. Its sound is
proportional to the actual value measured. It
helps to identify the location, direction, and
polarization of the maximum field strength.
You can chose the (inevitable) droop rate, at
which the held peak value decreases over
time. Set the switch below the signal evalua-
tion switch (recessed in the casing) to “Slow”
or “Fast”. In “Slow” mode it takes about 20
minutes to run out of tolerance, but in order
to get an accurate reading the display should
be checked frequently. If very short signal
peaks occur then the holding capacity of the
function needs some recurrences to load
fully. Setting:
LF-Processing - Video Bandwidth
The video bandwidth defines the minimum
duration of short pulses that still can be
measured by the meter without being dis-
torted.
For measurement of exceptionally short
pulses (e.g. Radar) or specific signals like
UMTS/3G an extremely high video band-
width is needed for accurate readings. The
HF58B-r allows for 2 MHz video bandwidth,
© Gigahertz Solutions GmbH, 90579 Langenzenn, Germany Revision 4.5 (Febuary 2006) Page 8
Quantitative Measurement:
Special case 1: UMTS / 3G
(Universal Mobile Telecommunication Sys-
tem, also known as the third generation of
mobile phones.) This technology is designed
to process huge amounts of data and has a
narrowly meshed network.
For measuring UMTS/3G the switch “Low
Frequency” Video Bandwith should be set to
“TPmax”.
With LogPer aerial and in “Peak “ mode iden-
tify the main direction of the signal and
switch to “ Peak Hold – long”
Now “gather“ the highest value without mov-
ing the meter ( use a wooden tripod ) for at
least 2 minutes in the same position. This is
important as because of the signal character-
istics of the UMTS/3G signal fluctuations by
the factor +/- 6 are common.
To hear samples how a UMTS/3G signal
sounds in the audio-analysis please check
“Pulse” .
use the combination of
our website for links to MP3 files.
Please note that when measuring UMTS/3G
you should not
switch-positions ”Average” and
radiation source.
In general, it is well accepted that
Most manufacturers of professional testing
equipment, however, do not share this view.
from the direction of the strongest
based on the maximum value emitted
exposure limit comparisons should be
But the details of the situation need to be
considered! For example, if a 2.4-GHz tele-
phone inside the house emits a similar level
of microwaves as a nearby cellular phone
base station outside the house, it would be
helpful to first turn off the 2.4-GHz telephone
in the house. Now measure the exposure
level originating from the outside. After hav-
ing measured the emission of the 2.4-GHz
telephone on its own, the sum of both meas-
urement values could be used for the expo-
sure assessment.
There is no “official regulation” nor clearly
defined testing protocol, because according
to German national standard-setting institu-
tions, as described earlier, quantitatively reli-
able, targeted and reproducible measure-
ments are only possible under “free field con-
ditions“ but not in indoor environments.
Cellular phone channel emissions vary with
the load. The minimum HF level occurs,
when only the control channel operates. It is
suggested that measurements should be
taken at different times during the day / week
in order to find out the times of highest traf-
fic.
LogPer to locate the direction from which
the major HF emission(s) originate, move
your wrist right and left. For emission
sources behind your back, you have to
turn around and place your body behind
Digital High Frequency Analyser HF58B-r
Quantitative Measurement:
Determination of Total High Frequency
Pollution
As described in Getting Started, attach the
LogPer antenna to the HF analyzer. Hold
the HF analyzer with a slightly outstretched
arm because objects (mass) directly behind
it “like yourself”, have effects on the testing
result. Your hand should not get too close to
the antenna, but should be near the bottom
end of the instrument.
In the area of a local maximum, the posi-
tioning of the HF analyzer should be changed
until the highest power density (the most im-
portant measurement value) can be located.
- When scanning “all directions“ with the
This can be achieved as follows:
the HF analyzer.
tached LogPer antenna, around its longi-
tudinal axis, determine the polarization
- Through rotating the HF analyzer, with at-
plane of the HF radiation.
- Change the measurement position and
avoid measuring exclusively in one spot..
because that spot may have local or an-
tenna-specific cancellation effects.
Some manufacturers of field meters propa-
gate the idea that the effective power density
should be obtained by taking measurements
of all three axes and calculating the result.
© Gigahertz Solutions GmbH, 90579 Langenzenn, Germany Revision 4.5 (Febuary 2006) Page 9
(SBM 2003)
Below 0.1 µW/m²
below 1 µW/m²
areas for pulsed radiation
Limiting values, recommenda-
tions and precautions
Quantitative Measurement:
Identify where the radiation enters a struc-
ture
Precautionary recommentation for sleeping
As a first step eliminate sources from within
the same room (e.g. cordless phones, wire-
less routers, etc.) Once this is completed, the
remaining radiation will originate from out-
side. For remedial shielding it is important to
identify those areas of all walls (including
(Landessanitätsdirektion Salzburg, Austria)
The official regulations in many countries
specify limits far beyond the recommenda-
tions of environmentally oriented doctors,
“building biologists” and many scientific in-
stitutions and also those of other countries.
They are vehemently criticised, but they are
nonetheless “official”. The limits depend on
frequencies and in the HF range of interest
here they are between 4 and 10 W/m², far
beyond 10 million times the recommenda-
tions. Official limits are determined by the
potential heat generation in the human body
and consequently measurements of averages
rather than peaks. This ignores the state of
potentiell
durchlässiger
Bereich
wall
stand in the
. That is because
7
wrong!
wall
doors, windows and window frames!), ceiling
and floor, which are penetrated by the radia-
tion. To do this one should not
centre of the room, measuring in all direc-
tions from there, but monitor the permeable
areas with the antenna (LogPer) directed and
positioned close to the wall
the antenna lobe widens with increasing fre-
quency. In addition reflections and cancella-
tions inside rooms make it difficult and often
right!
impossible to locate the “leaks” accurately.
See the illustrating sketch below!
antenna
potentially HF-permeable
part of the wall
antenna
environmental medicine. The “official” limits
are far beyond the range of this instrument,
which is optimized for accurate measurement
of power densities targeted by the building
biologists.
The standard SBM 2003 cited above classi-
fies power densities of below 1µW/m² as “no
anomaly” for non pulsed radiation in sleeping
areas, and for pulsed radiation one tenth of
that.
The uncertainty of localization with HF-antennas
The shielding itself should be defined and
surveyed by a specialist and in any case the
area covered by it should be much larger
than the leak
7
The "Bund für Umwelt und Naturschutz
Deutschland e. V." (BUND) proposes 100
Please note: In this position the readings on the LCD
only indicate relative highs and lows that cannot be
interpreted in absolute terms.
Digital High Frequency Analyser HF58B-r
Quantitative Measurement:
Special Case 2: Radar
For air and sea navigation a radar antenna
slowly rotates around its own axis, thereby
emitting a tightly bundled “radar ray“. Even
with sufficient signal strength, this ray can
only be detected every couple of seconds,
for a few milliseconds. This requires special
measurement technology.
The HF58B-r with its video bandwidth of 2
MHz provides this technology. Please use
the following procedure to ensure correct
readings:
Setting: Video bandwidth to “Tpmax”. Signal
Evaluation – “Peak”. With the help of the au-
dio analysis (a very short “Beep” every cou-
ple of seconds), one can clearly identify a
radar signal. With this setting and the LogPer
antenna you can identify the direction of the
source of the signal.
With the signal Evaluation switch set to
“Peak Hold” and the LogPer antenna di-
rected towards the signal emitting source.
Wait for several circles of the radar ray, move
the instrument a little left and right in order to
get the relevant maximum reading.
The long delays between pulses may con-
sume a great deal of time trying to detect
signal direction with a LogPer aerial.
Please note that there are Radar systems
that are operated at even higher frequencies
that can be measured with this instrument,
yet possibly not the full intensity.
© Gigahertz Solutions GmbH, 90579 Langenzenn, Germany Revision 4.5 (Febuary 2006) Page 10
Audio Frequency Analysis
Many different frequencies within the fre-
quency band between 800MHz and 2.5GHz,
are being used by many different services.
The audio analysis of the modulated portion
of the HF signal, help to identify the source
of a given HF radiation signal.
First get the HF analyzer ready for testing by
following the instructions in the relevant sec-
tion.
Important: For the audio analysis switch the
small switch on the right of the display to
“Pulse”. This will eliminate the content of
unpulsed signals, since their acoustical
marking (“rattling” with 16 Hz) will make the
acoustical analysis difficult.
How to proceed:
For audio analysis, simply turn the volume
knob of the speaker at the top of the case all
.
the way to the left (“-“). If you are switching
to audio analysis while high field strength
levels prevail, high volumes can be generated
quite suddenly. This is especially true for
measurements which are to be taken without
audio analysis. The knob is not fastened with
glue to prevent over winding. However, if by
accident you should turn the knob too far,
simply turn it back again. No damage will be
caused.
Set the On/OFF switch at
Sounds and signals are very difficult to de-
scribe in writing. The best way to learn the
signals is to approach known HF sources
very closely and listen to their specific signal
patterns. Without detailed knowledge, the
characteristic signal patterns of the follow-
could not be established with sufficient cer-
tainty.
In summary it confirms the justification of
precautionary limits well below the pre-
sent legal limits. Note for owners of cellular phones:
Digital High Frequency Analyser HF58B-r
µW/m² outside buildings. In view of the
shielding properties of normal building mate-
rials, far lower values exist inside buildings.
In February 2002 the Medical Authority of the
Federal State Salzburg, Austria, recommends
to reduce its “Salzburger Precautionary Rec-
ommendation” from 1 000 µW/m² to 1 µW/m²
Unimpaired reception of calls is possible with
power densities far below even the very strict
precautionary recommendation of 0.1 µW/m²
for pulsed HF frequencies by the SBM 2003.
inside buildings and 10 µW/m² outside.
These limits are based on empirical evidence
over the past few years.
The ECOLOG-Institute in Hannover, Ger-
many made a recommendation only for out-
side areas, namely 10000 µW/m². This is well
above the recommendation by building bi-
ologists and aims at getting consent also
from the industry. This would possibly enable
a compromise for a more realistic limit than
the government regulations cited above. The
authors qualify their recommendation in
mum possible emission of the transmitting
stations. As the emission measured de-
pends on the constantly varying actual
load, this restricts the normal exposure
- The limit should be applicable to the maxi-
much further.
than one third to this total.
- A single station should not contribute more
medical and building biology specialists
could not be considered for the proposed
limits, as their results are not sufficiently
documented. The authors state, that “sci-
entific scrutiny of their recommendations is
- The extensive experience and findings of
needed urgently”.
research could be considered for the pro-
posed limits, as their damaging potential
- Not all effects on and in cells found in their
© Gigahertz Solutions GmbH, 90579 Langenzenn, Germany Revision 4.5 (Febuary 2006) Page 11
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