Gigahertz Solutions HF58B-r User guide

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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

This manual will be continuously updated, improved and

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.

in part or total without editor’s written permission.

Digital High Frequency Analyser HF58B-r

. set-

(Push and

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

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.

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)

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

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

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.)

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.

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.

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

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

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-

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.

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.

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

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,

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.

(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

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

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.

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

volume proportional to its contents of the

total signal. This “marking” has a frequency

of 16 Hz, and an audio sample can also be

downloaded as a MP3 file from our website.

This marking tone will only be audible with

the switch to the right of the display set to

“Full“. If the switch is set to “Pulse” the cir-

cuitry to suppress the content of un-pulsed

Analysis of the modulated /

pulsed signal ( total / pulse )

The exposure limits of pulsed radiation (acc.

to SBM2003) are lower by a factor of 10 than

that of non–pulsed signals. It is very impor-

tant to distinguish between these two types.

Without this knowledge you will not be able

to determine which limit to apply..

signals is activated. There will be nothing to

be marked.

Note concerning the switch setting “Pulse“:

The feature to distinguish between these two

types of radiation in absolute numbers has

been introduced for a broad band instrument

Under special laboratory conditions a signal can be

created, which causes an additional deviation from the

actual value of up to -3 dB. Under field conditions like

DECT and GSM signals only minimal deviations.

Use of Signal Outputs

AC output:

The AC output “PC/head-set”, 3.5 mm jack

socket, is meant for in-depth analysis of the

AM/pulsed content of the signal by headset

or a PC-audiocard and appropriate software.

For PC sound card or headphones or PC

software please ask or write us. DC output (2.5 mm jack socket):

of this price range for the first time. This is a

significant advantage over the commercial

spectrum analyzers, with which this differen-

tiation requires extra work.

The little switch to the right of the display

allows one to distinguish between the com-

plete signal including the pulsed part and its

pulsed or modulated part only.

In the “Full” setting, the power densities of all

signals in the frequency range of interest are

displayed. In “Pulse” setting only those

which are amplitude modulated are dis-

played. Signals like GSM (mobile phone),

DECT, Radar and WLAN/Bluethooth and

others can have similar intensities in either

switch setting. Even within tolerance limits,

they have no content of carrier frequency.

For logging devices or optional external dis-

play unit. When “Full Scale“ is displayed, it

has 1 VDC output, depending on the position

of switch 7.

The auto power off function is deactivated if

external devices are connected. Neverthe-

less, the battery is still protected against total

discharge.

Superposition and background radiation,

however, will mostly lead to a moderate dif-

ference in intensity.

Marking of unpulsed signals

Un-pulsed signals by their very nature are not

audible in the audio analysis and therefore

easily missed. For that reason they are

marked by a uniform “rattling” tone, with its

Digital High Frequency Analyser HF58B-r

ing HF sources can be easily identified: 2.4-

GHz telephones (base station and handset)

as well as cellular phones, the signal patterns

of which can be divided into “a live con-

nected phone call“, “stand-by mode“ and

especially the “establishing of a connection“.

The typical signal patterns of a cellular phone

base station can also be identified this way.

For comparison reasons you are well advised

to take measurements during high-traffic

times, as well as some times during the

night, in order to familiarize yourself with the

different noises.

The volume can be controlled with the “vol-

ume” (speaker) knob. Note: The power con-

sumption of the speaker is directly propor-

tional to the volume.

The optional variable frequency filters VF2 or

VF4 available help to facilitate the audio

analysis significantly and at the same time

add to its accuracy. They filter out individual

frequencies so contributions from other

sources can be identified.

On our home page (www.gigahertz-

solutions.de) is a link to some typical sam-

ples of audio analyses as MP3-files.

pulsed signals see the next section.

For more on acoustical marking of un-

nector into either the AC or DC output.

This will deactivate the automatic power

off function. Switch on the meter until it

turns off (which happens automatically

shortly before the battery is damaged by

“deep discharging”)

green “Charging” LED should turn on. If

not, switch the analyzer on and then off

until it turns on.. After 10 to 13 hours the

charging process will finish automati-

cally. When charging is complete, the

green LED will turn off automatically.

times. Repeat every few months to

maintain maximum charging capacity.

Battery Management

Conditioning of the internal rechargeable

battery

The instrument comes with a rechargeable

internal NiMH-Battery. This should be condi-

tioned to achieve its maximum capacity.

We are working on a new instrument for the

analysis of yet higher frequencies (up to

about 6 GHz, i.e. WLAN, WIMAX and some

directional radio sources and flight radar)

.This will be available in 2006.

Available for low frequencies:

Electrosmog is not limited to the Radio Fre-

1. Plug the included, 2.5mm adapter con-

Please proceed as follows:

quency range!

Also for the low frequency range such as

power (distribution and domestic installa-

tions) including their higher harmonics we

offer a broad range of affordably priced in-

struments with high professional standards.

2. Connect the AC-Power adaptor. The

Please refer to a list of contacts is at the end

of this brochure.

3. Repeat this procedure one or two more The rechargeable battery will thank you with

a longer life and a full capacity.

amongst other features will enable to dis-

play the results in other units, like e.g.

V/m and widen the range displayable to

49990 instead of the present 19990

digits.

Digital High Frequency Analyser HF58B-r

Further Analysis /

Optional Accessories:

Gigahertz Solutions offers a range of pream-

plifiers and attenuators, to widen the range of

power densities which can be processed

with this instrument, See section Quantitative

Measurement.

Furthermore there are two variable frequency

filters (“variable traps”) for quantitative sepa-

ration between different sources of radiation.

One of them blocks the selected frequency

by 20 dB to one hundredth of its real inten-

sity; the other version blocks by 40 dB for a

more accurate reading.

Future developments for this instrument:

1. A digital extension module, which

recording of single readings or for a long

term series of readings (data logging) in-

cluding PC software for their evaluation.

2. A digital internal extension module for

Instrument for lower frequencies

For measurement of signal frequencies

above 27 MHz (including: CB radioing, ana-

logue and digital TV and radio TETRA etc.)

we offer the instruments HFE35C and

HFE59B. Instrument for yet higher frequencies

Remediation and Shielding

Please call us or send us an e-mail.

We will assist you in any shielding project

you might have.

The shielding effect of the various materials

is stated normally in “- dB”, e.g. “– 20 dB”.

use a charger or AC-adapter!

Conversion of shielding effect into reduction

of power density

„-10dB“ is measured value divided by 10

“-15dB” is measured value divided by ~30

”-20dB” is measured value divided by 100

”-25dV” is measured value divided by ~300

”-30dB” is measured value divided by 1000

etc.

Please be aware of the manufacturer’s notes

about the normally achievable shielding ef-

fects, as 100 % shielding is almost always

impossible. Partial shielding reduces the at-

tenuation considerably. That is why shielding

of seemingly radiation tight adjacent areas is

highly recommended.

the HF analyzer or it has been turned ON

accidentally during transport, it will shut

off automatically after 40 minutes of con-

tinuous use.

the digits in the center of the display, the

HF analyzer will turn OFF after 3 min in

order to avoid unreliable measurements.

In that case charge the rechargeable

battery.

will only be de-activated by plugging in a

2.5mm jack into one of the output sock-

ets AC or DC, see “Conditioning…” two

sections up. The function will be re-

activated to automatically prevent total

discharging of the battery by further op-

eration.

Auto-Power-Off

Digital High Frequency Analyser HF58B-r

Changing the rechargeable Battery

The battery compartment is at the back of

the analyzer. To remove the lid, press on the

grooved arrow and pull the cap off. Insert

only rechargeable batteries. If you use

regular alkaline (non – rechargeable) bat-

teries do not

This function conserves energy and extends

1. In case you have forgotten to turn OFF

the total operating time.

2. If “low batt” appears vertically between

3. The built-in function, Auto-Power-Off,

Digital High Frequency Analyser HF58B-r

Warranty

We provide a two year warranty on factory

defects of the HF analyzer, the antenna and

accessories.

Antenna

Even though the antenna appears to be

rather delicate, it is made from a highly dura-

ble FR4 base material that can easily with-

stand a fall from table height.

HF Analyzer

The analyzer itself is not impact proof, due to

the comparatively heavy battery and the

large number of wired components.

Any damage as a result of misuse is ex-

cluded from this warranty

( µW/m² to V/m )

Conversion Table

- - 1,2 21,3 120 213

- - 1,4 23,0 140 230

- - 1,6 24,6 160 246

- - 1,8 26,0 180 261

- - 2,5 30,7 250 307

µW/m² mV/m µW/m² mV/m µW/m² mV/m

0,01 1,94 1,0 19,4 100 194

0,02 2,75 2,0 27,5 200 275

0,03 3,36 3,0 33,6 300 336

- - 3,5 36,3 350 363 0,04 3,88 4,0 38,8 400 388

0,05 4,34 5,0 43,4 500 434

0,06 4,76 6,0 47,6 600 476

0,07 5,14 7,0 51,4 700 514

0,08 5,49 8,0 54,9 800 549

0,09 5,82 9,0 58,2 900 582

0,10 6,14 10,0 61,4 1000 614

0,12 6,73 12,0 67,3 1200 673

0,14 7,26 14,0 72,6 1400 726

0,16 7,77 16,0 77,7 1600 777

0,18 8,24 18,0 82,4 1800 824

0,20 8,68 20,0 86,8 2000 868

0,25 9,71 25,0 97,1 2500 971

0,30 10,6 30,0 106 3000 1063

0,35 11,5 35,0 115 3500 1149

0,40 12,3 40,0 123 4000 1228

0,50 13,7 50,0 137 5000 1373

0,60 15,0 60,0 150 6000 1504

0,70 16,2 70,0 162 7000 1624

0,80 17,4 80,0 174 8000 1737

0,90 18,4 90,0 184 9000 1842

conversion” therefore does not

formula, which depends on frequency and specifics of

the antenna used. A “re

make sense.

Instrument as delivered,

i.e. without preamplifier or attenuator

switch "Adapter"("Pegelanpassung") to "0 dB"

Bar on LCD

Displayed value & unit

0.01 - 19.99 mW/m²

00.1 - 199.9 µW/m²

0.01 - 19.99 µW/m²

1 - 1999 mW/m²

0.01 - 19.99 mW/m²

Displayed value & unit

With ext. Attenuator DG20,

switch "Adapter" to "Attenuator -20 dB"

Simply read out, no correction factor

Bar on LCD

.001 - 1.999 mW/m²

Simply read out, no correction factor

00.1 - 1999 µW/m²

0.01 - 19.99 µW/m²

Displayed value & unit

switch "Adaptor" to "Amplifier +10dB"

With ext. Preamplifier HV10,

Bar on LCD

.001 - 1.999 µW/m²

Why no column „dBm“?

Most recommended limiting values for HF radiation are

given in W/m² (sometimes also in V/m), which is why

this instrument is displaying in power density, µW/m²

resp. mW/m². A display in dBm as e.g. on a spectrum

analyzer requires transformation by a complicated

With ext. Preamplifier HV30,

00.1 - 199.9 µW/m² nW/m²

switch "Adapter"("Pegelanpassung") to "0 dB"

0.01 - 19.99 mW/m² µW/m²

Simply read out, no correction factor

Displayed value & unit Actual unit

Bar on LCD

0.01 - 19.99 µW/m² nW/m²

Same decimal point, but next smaller unit

Digital High Frequency Analyser HF58B-r

Measurement ranges of the HF58B-r

Range

Coarse

Medium

Fine

Range

Coarse

Medium

Fine

Range

Coarse

Medium

Fine

Range

Coarse

Medium

Fine

(Coarse = grob; Medium = mittel; Fine = fein)

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ME 3951A

With F1B2H31 (Frequency Filter Module: 16 Hz Band Pass/50Hz High Pass/2kHz High Pass)

User's Guide

- Functions & Controls

- Operation and Maintenance

- Measurement Instructions

- Field Theory

It is important to read carefully the instruction manual prior to using the field meter. Important information regarding safety, use and maintenance is provided herein.

GIGAHERTZ

SOLUTIONS

With the field meters of the ME 3 series, GIGAHERTZ SOLUTIONS® sets new standards in electromagnetic field testing. Professional measurement engineering is 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, some of which have patents pending, as well as highly sophisticated production engineering.

The field meter you purchased allows a competent assessment of AC electric as well as AC magnetic field exposures according to the internationally recognized Swedish guidelines for computer monitors (TCO/MPR), covering the entire frequency range from 5 Hz up to 400 kHz.

We appreciate the confidence you showed when purchasing the ME 3951A field meter. With the confidence that your expectations will be met, we wish you great success in collecting useful information with this field meter.

© by the manufacturer: GIGAHERTZ SOLUTIONS®GmbH, D-90579 Langenzenn. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, or recorded by any information storage or retrieval system, without permission in writing by GIGAHERTZ

SOLUTIONS®GmbH.

Preface

GIGAHERTZ

SOLUTIONS

Contents

Page

Safety instructions ........................................................................................................................3

Function & controls ........................................................................................................................4

Getting started ...............................................................................................................................6

Measurement instructions ...............................................................................................................8

Changing Batteries .......................................................................................................................16

Battery management ....................................................................................................................18

Safety Instructions:

It is important to read carefully the instruction manual prior to using the field meter. Important information regarding safety, use and maintenance is provided herein.

The adapter is only to be used with the specified, rechargeable battery. Never try to recharge nonchargeable primary batteries (e.g. zinc-coal or alkaline batteries) with it: Explosion Hazard!

The grounding of the field meter required for the electric field measurements should be performed with the supplied grounding lead, which can be connected to bare water, gas or heating pipes. If there is none of the above-mentioned grounding options available, a licensed electrician could temporarily also make use of the grounding conductor in a grounded outlet. In this case, however, an electric shock hazard may occur when the grounding clip touches the current-carrying phase conductor.

To prevent shock hazards or the destruction of the field meter, neither the instrument itself nor the adapter should ever come into contact with water. The penetration of water into the case may lead to the destruction of the electronics inside. Field meters are not to be stored outdoors or used during rain. Clean the case only from the outside, using a slightly moist cloth. Do not use cleaners or sprays.

Prior to cleaning the field meter 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 field meter 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 the like. Do not let it drop nor try to manipulate its electronics inside when the case is open.

This field meter should only be used for the purposes described herein and only in combination with supplied or recommended accessories.

Contents, Safety Instructions

GIGAHERTZ

SOLUTIONS

Function & Controls

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SOLUTIONS

Battery Charging

Extension cord of the supplied adapter: 12-24 VDC, with (+) at the internal conductor and (-) at the external conductor. Only to be used during battery charging see pages 6, 18

Range Selection

200 nT/Vm: (fine)

0 to 199.9 Nanotesla (nT) 0 to 199.9 Volt per Meter (V/m) 2000 nT/Vm: (coarse) 0 to 1999 Nanotesla (nT) 0 to 1999 Volt per Meter (V/m)

see page 9

AC - Signal output

1 VAC at maximum display: Connector for a spectrum analyzer to analyze the frequency spectrum of the measured signals. At maximum display, the maximum frequency output is 30 kHz.

see page 15

Field type

E: Electric Field M: Magnetic Field Test: Offset Display

see pages 7, 10, 11

Operation

"Speaker Icon": Speaker turned on

On: Field meter turned on Off : Field meter turned off

see pages 7, 11, 18

Frequency Filter F1B2H31

16 Hz Band pass, 50 Hz High pass, 2 kHz Highpass, for building biology assessments to identify railway systems, electric power grid as well as harmonics of higher frequencies

see pages 11, 12, 14

Light diode: comes on while battery is being charged

see page 18

Button to be pressed for the display of the battery status as well as the display check

see page 19

Display of the Field Type in Use Dash at the top: Electric field

strength is displayed

Dash at the bottom: Magnetic

flux density is displayed

Two Dashes: Self-diagnostics

LC-Display: 3.5-digit display of the measu-

rement value (mean value)

see page 19

DC - Signal output

0 to -1 VDC Signal output Suitable for long-term monitoring with a data logger or data plotter, but also for connecting the optional external display unit (DP 3000A)

see page 15

Picture 01

Ground

Connection of the grounding lead (for electric field testing)

see page 9

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Function & Controls

Switch to short-circuit the magnetic sensor, which is only used by the manufacturer for calibration purposes.

Sensor for AC Magnetic Fields

see pages 7

Rechargeable Battery (”9 Volt E-Block”) Caution: Battery should only be used within the supplied isolation compartment made of cardboard in order to avoid short-circuit damage of the instrument.

see pages 17

Battery Compartment

LC-Display: 3.5-digit display of the measurement value (RMS) including field type and low batt. indicator

see page 19

2 Miniature Speakers in a magnetically shielded circuit

Pegs to hold the rechargeable battery in place

Picture 02

Frequency Filter Module F1B2H31

Can be replaced with modules featuring other threshold frequencies.

see pages 11, 12, 14

Sensor for AC Electric Fields ("Field plate")

see pages 7

Switch to short-circuit the field plate, which is only used by the manufacturer for calibration purposes

Instrument Contents:

1.) 2.) 3.)

4.) 5.) 6.)

7.) 8.) 9.)

1.) Field meter

2.) Adapter with external voltage jack (2.0 mm)

3.) Grounding lead (5 m) with jack plugs (2.5 mm, mono) and alligator clip

4.) Grounding clip

5.) BNC measurement adapter on jack plug (3.5 mm, mono)

6.) Measurement jack adapter (3.5 mm, mono) on jack plug (2.5 mm, mono)

7.) Jack plug (2.5 mm, mono) for creating your own measurement adapter

8.) Wedge for opening the case to change batteries or frequency filter modules

9.) Rechargeable battery with 9 V nominal voltage (Depending on shipping conditions, it is

sometimes already inserted into the field meter.).

Getting Started

Turning On

If no display is activated, insert rechargeable battery. (See section "Changing Battery").

Charging

If display shows low-batt. indicator, charge battery or insert a fully charged battery. (See section "Battery Management").

Instrument Contents, Getting Started

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Function Testing - Display of Magnetic Flux Density:

1.Display: Field Type = “M”, Measurement Range = ”200 nT/Vm”, Frequency Range = ”5 Hz - 400 kHz”, Operation = "Speaker Icon”

2.Move the field meter in fast and short movements around its longitudinal axis back and forth, as shown in picture 03.

Picture 03 As a result, the static geomagnetic field is turned into a "quasi

alternating field." The faster and greater the movements, the stronger the induced alternating field will be. This will be reflected in the higher measurement values on the display and the faster "rattling" noise from the speaker, which is proportional to the field strength.

Function Testing - Display of Electric Field Strength:

1. Display: Field Type = “E”, Measurement Range = ”200 nT/Vm”, Frequency Range = ”5 Hz - 400 kHz”, Operation = "Speaker Icon”

2.Keep the field meter steady while tapping the front of the case with your fingers, as shown in picture 04.

Picture 04 Due to your fingers' mass potential a "quasi AC electric field" is

created whose strengths is reflected through higher measurement values on the display and the faster "rattling" noise from the speaker.

Defining the Offset:

Turn on the instrument and set the switch "field type" to the "test" position. On the left-hand side of the display a "1" (as icon for the test mode) will appear and on the right-hand side either "00.0" or "000", depending on the selected measurement range.

If instead of "000" or "00.0" a higher measurement value is displayed, this value would reflect the current deviation from zero.

Picture 05

Such a situation can occur because of current environmental conditions (e.g. temperature, air humidity, etc.) The tolerance of the subsequent electric and magnetic field measurements will be increased by this deviation value.

Function Testing, Offset

GIGAHERTZ

SOLUTIONS

Tap here!

Measurement Instructions

Introduction to the Properties of AC Electric and Magnetic Fields

Generally speaking, the sensory organs of the human body cannot perceive alternating electric and magnetic fields. These fields are "simply there" and expand into three-dimensional space, following rather complex physical laws. For measurement practice, the following properties of alternating electric and magnetic fields are very important:

1. Any measurement is always determined by position as well as direction. The slightest change in position or direction of the field meter can have substantial consequences for the measurement value, especially in AC magnetic fields.

2. Electric as well as magnetic fields not only penetrate into solid materials including walls, glass or the like, but also pass right through them. This holds especially true for magnetic fields, whose shielding is rather costly.

3. AC electric fields occur whenever an alternating voltage is applied. In residential situations, for example, all plugged-in extension cords and appliances including switches are surrounded by alternating electric fields. This even holds true when the appliance is turned off! As soon as an appliance is turned on, there is current flow and an AC magnetic field is added.

4. Beside the field strength, AC electric or magnetic fields are also characterized by their frequency. We distinguish between the low frequencies of the ELF and VLF range between 5 Hz and 400 kHz as defined by the MPR/TCO guidelines for the assessment of computer monitors as well as all the higher frequencies including radio waves and microwaves. Furthermore there are also static magnetic and electrostatic fields, each of which requires a totally different approach to testing just like RF radiation.

Introduction to Measurement Instructions

In order to obtain meaningful testing results, the Ökotest magazine (6/96) demands the following minimum requirements for testing equipment of electric and magnetic fields in the ELF and VLF range:

1.Separate measurements of AC electric fields (with ground reference) and AC magnetic fields.

2.Reproducible, high accuracy.

3.Flat frequency response across the entire specified frequency range, which should at least cover

the railway frequency 16.67 Hz all the way through to the kilohertz range (only in Europe).

4.High sensitivity: 10 nT or 1 V/m, or better.

The field meters by GIGAHERTZ SOLUTIONS

meet all the above requirements.

Measurement Instructions

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SOLUTIONS

Preparations Prior to Testing

1. Check the field meter according to the instructions laid out under "Getting Started".

2. First of all take measurements of AC electric and magnetic fields outdoors to get a feel for the background radiation. If the field meter registers more than 5 V/m or 5 nT (0.05 mG), this will give you an idea of the background exposure. By means of turning off the circuit breakers in the main panel, it is possible to determine which of the fields are caused from inside the house and which ones from outside such as high-tension power lines, railway trails, pole-mounted or surface transformers as well as neighboring houses/apartments. If external fields are suspected, their sources can be traced by moving the field meter into the direction of the highest readings.

3. When performing an EMR survey in homes or at workplaces, all typical electric appliances and electronic devices should be turned on, also including those that come on only temporarily such as refrigerators or storage space heaters (e.g. in adjoining rooms). By turning the various appliances off and on, it is possible to locate the most important field sources.

4. A sketch of the area to be measured that shows the corresponding test results and allows for a later analysis of the situation. Thus appropriate remediation strategies can be assigned.

5. Start with the measurement range "200 nT/Vm." Only if the display goes in overload because of rather high ambient field strengths, switch to the higher range "2000 nT/Vm".

6. Ideally, all measurements are to be repeated during various times of the day and on different days of the week in order to identify fluctuations.

7. The additional sound signal that is proportional to the field strength makes the detection of field sources easy.

Measurement Instructions - AC Electric Fields

1. Grounding the Field Meter and the Person Performing the Testing

According to relevant guidelines (TCO, MPR II, TÜV), prior to any electric field testing the field meter needs to be connected to ground potential through the supplied grounding lead in order to obtain reliable, reproducible testing results. Without a proper connection to ground potential no reliable statements on AC electric fields can be made.

Unvarnished, metal piping for water, gas or heating can be used to connect the grounding lead with its grounding clip. As an alternative, a licensed electrician could also use an alligator clip to establish a grounding connection through the grounding conductor in a grounded outlet. Warning: In case the phase conductor is touched, an electric shock hazard may result.

Picture 06

Measurement Instructions

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Insert the jack plug of the grounding lead into the dedicated socket ("ground", "ground icon") and at the same time run the grounding lead alongside the case to the back. Touch the "AC" or "DC" socket with your finger in order to bring your own body to ground potential. Picture 07

Picture 07

Picture 08 Picture 09 Picture 10

Caution: In case the grounding lead runs in front of the instrument case or a finger is between the DC socket and the front of the instrument case, testing results will become distorted. (See also footnote 1)

2. Positioning of the Field Meter for AC Electric Field Testing

The field meter is calibrated for measurements taken in close proximity to the body (Picture 11). The field sources located behind the field meter are shielded through the body. Therefore misleading concentrations of field lines onto the electric field sensor are avoided. Therefore try to avoid taking measurements with a stretched-out arm. In general, this would lead to higher testing results (Picture 12). This type of distortions can be reduced or avoided by placing a conductive surface behind the field meter. (Picture 13, see also footnote 1)).

Picture 11 Picture 12 Picture 13

1) The electric field strength measured with ground reference always depends on the geometry of the field source and the sensor, the distance

between sensor and field source as well as ambient potentials. Following TCO guidelines, the ME 3951A is calibrated according to the TCOcalibrated field meter "Radians Innova - Enviromentor EMM-4 (Serial. No. 4348)" at a distance of 50 cm from a 4-sqm large copper plate operating at 50 Hz and 270 V. Instead of a person, which is also grounded during testing in the field, a grounded, square copper plate measuring 50 cm (ca. 20") on its sides is placed behind the field meter during calibration. The same procedure is recommended for reproducible tripod measurements. Testing results of the ME 3951A can only be expected to correspond with those of an original TCO sensor when the distance from the field plate is greater than 30 cm (12"). The measured field strength represents a spatial integral across the testing equipment, whose simplification "measurement value in the direction of the highest display = resultant field strength" is a good approximation for practical purposes.

Measurement Instructions

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3. AC Electric Field Testing

Turn on the field meter and set the switch "Field Type" to "E" for AC electric field. (Picture 14)

Set the switch for the frequency filter to "50 Hz to 400 kHz". Thus self-inductions due to micromovements (shaking of hand) will be suppressed. (Picture 14)

Picture 14 During testing always ensure that the grounding lead runs to the

back of the case and that the person performing the survey as well as anybody else present are located behind the field meter.

Keep the field meter close to your body. The further away you hold the instrument or if it is even put down, the falsely higher the testing results tend to become. Either point to the suspected field source or - if no such concrete source is known - check the space systematically. Proceed as follows:

- First of all, move slowly through the room to be measured.

- Stop frequently and take measurements pointing to the back, to the left, to the right and to the ceiling. Always keep in mind to have the grounding lead run to the back of the instrument.

- Follow into the direction of the highest reading in order to identify the field source.

- In areas where people spend substantial amounts of time such as in bed or at a workplace, check all directions as mentioned above and make note of the orientation of the field meter at maximum readings. In such a position, a reference measurement of the absolute value should be taken as close to the body as possible.

- After having checked all directions, the maximum measurement value can be used as a first approximation of the resultant field strength.(See footnote 1))

When the field meter is placed on a tripod or on a table, it is necessary to also place a person 5 cm (2") behind the instrument to obtain accurate measurements. For reproducible measurements, a metal plate (50 cm x 50 cm) is required to be orthogonal and centered 5 cm behind the instrument.

An EMR survey of sleeping areas should also include measurements under "sleep conditions," that is bedside lamp turned off. Under certain circumstances the electric field can even increase after something was turned off.

Recommended Exposure Limit up to 2 kHz:

Below 10 V/m, better yet below 1 V/m.

(For frequencies above 2 kHz always below 1 V/m)

Measurement Instructions

GIGAHERTZ

SOLUTIONS

AC Magnetic Field Testing:

Turn on the field meter and set the switch "Field Type" to "M" for AC magnetic field. (Picture 15)

Set the switch for the frequency filter to "50 Hz to 400 kHz". Thus self-inductions due to micromovements (shaking of hand) will be suppressed. (Picture 15)

Picture 15 For reliable measurements of AC magnetic fields, neither the field

meter nor the person performing the measurements need to be grounded. Other persons or mass potentials in the vicinity of the field meter do not affect the testing results.

If a field source is suspected, point into that direction. Otherwise check the space systematically. Proceed as follows:

- First of all, move slowly through the room to be measured. The magnetic sensor is positioned

in such a way in the instrument that most typical field sources in residential settings are detected as long as the field meter is held horizontally. In addition, all three dimensions should be checked from time to time as shown in the pictures 16 through 18.

- In practice, the identification of a field source has proven to be most effective by locating the

direction of the highest reading first. Then you follow the direction, which continues to show increasing measurement values. Simply keep the field meter aligned in the direction of the maximum readings. For an accurate measurement, however, hold the instrument very steady or put it down at a relevant measurement point.

- In the important places where we work, sit or sleep, all three dimensions of AC magnetic fields

should be checked each time. Proceed as follows.

Accurate Measurement of the Magnetic Field Strength in the Presence of Several Field Sources

In this event, it is necessary to take three separate measurements and write the readings down. The field meter should be held as shown in the pictures: point to the front (Picture 16), to the ceiling (Picture 17) and to the side so that it is perpendicular to the front axis (Picture 18).

In order to estimate the resultant, that is the actual AC-magnetic-field exposure, the following rules of thumb can be applied.

Rules of Thumb for Estimating the Total Magnetic Field Strength

Measurement Value: Corresponding Total Magnetic Field :

- One high, two low values ~ Highest value

- Two high, one low value ~ Highest value + half of the second highest value

- Three similar values ~ One and a half times of the highest

Measurement Instructions

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Picture 16 Picture 17 Picture 18

Recommended Exposure Limit up to 2 kHz:

Below 200 nT, better yet below 20 nT.

(For frequencies above 2 kHz below 20 nT, better yet below 2 nT)

The resultant, total magnetic field strength (the sum of the single field strengths, 3-D Measurement) can be accurately calculated according to the following equation:

Resultant Field Strength = Square Root(x² + y² + z²)

Picture 19 illustrates the direction of the resultant field, which is also called "substitute field." The photos for pictures 16 through 18, showing the single measurements of the three dimensions, as well as picture 20 were taken in a kitchen during a typical testing session. If you would insert the display values in the above equation, the result would come very close to the value, which is displayed in picture 20. There the field meter is held perpendicular to the resultant field.

Picture 19 Picture 20

Measurement Instructions

GIGAHERTZ

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Res.

Frequency Analysis (AC Electric and Magnetic Fields)

An AC electric or magnetic field is not only defined by its field strength, but also by the frequency with which the polarity of the field changes. We encounter various common frequencies:

- Overhead railway wires operate at 16.7 Hz (only in Europe).

- The electric power grid (home wiring, high-tension power lines) operates at a 60-Hz frequen-

cy in North America and at a 50-Hz frequency in Europe. So-called natural harmonics are the multiples of the respective fundamental frequency (50 Hz or 60 Hz).

- In addition, various electronic devices are used in our homes that generate a variety of fields

with higher frequencies in the kHz range (artificial harmonics) such as switch-mode power adapters ("transformers"), ballasts of fluorescent tubing and energy saving lamps as well as dimmer switches with so-called switch mode technology and the like.

For the assessment of a certain area and especially with regards to appropriate remediation strategies, it is very useful to know how many of the different frequencies contribute to the total exposure. An exposure caused by overhead railway wires, for example, cannot be remedied by installations of the homeowner. However, it is possible to avoid certain signals of the kHz range by choosing devices without such emissions (e.g. incandescent lamp instead of fluorescent tubing) (only in Europe).

The ME 3951A field meter offers you different options to analyze frequencies:

Frequency Analysis with Frequency Filter Module F1B2H31

Picture 21 Picture 22

Depending on the testing situation, GIGAHERTZ SOLUTIONS®offers several different frequency filter modules for the ME 3951A. The Frequency Filter Module F1B2H31 (Picture 21/22) already supplied with the field meter is specifically designed for building biology needs. The following frequencies can be selected:

1) 5 Hz to 400 kHz = Entire TCO frequency range, best suited for tripod measurements

2) 16.7 Hz = 4th order band pass filter with Q-Factor 10 for the frequency of

overhead railway wires (only in Europe)

3) 50 Hz to 400 kHz = 5th order high pass filter for the electric power grid and its harmo-

nics

4) 2 kHz to 400 kHz = 5th order high pass filter for so-called artificial harmonics above 2

kHz. This frequency range corresponds with band 2 of the Swedish TCO guidelines.

In order to measure fields of overhead railway wires or harmonics, first the respective filter in the

Measurement Instructions

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field meter needs to be activated. Generally speaking, the testing follows the same principles as described in the section "Measurement Instructions" for the fields of the power grid system. There are only two points, which deserve special mention here:

- Usually the source of the railway currents is located outside of a house. It is recommended,

nonetheless, that the entire house is roughly checked anyway because sometimes railway frequencies can also be found on, for example, water or gas piping as well as the electric wiring system due to coupling effects. If a house to be tested is closer than 2 to 3 km to an electric railway track, such potential sources should be checked to be on the safe side.

- "Artificial" harmonics usually are less energetic than power or railway frequencies and therefo-

re show lower testing results. For this frequency band, however, all renowned institutes recommend exposure limits that are 10 times lower than those for power frequency fields. Therefore the frequency range "200 nT/Vm" is usually sufficient.

Note: Due to 1/f higher and white noise, filter tolerances, micromovements of the instrument and frequencies beyond the filtered frequency bands, the testing results of the position "5 Hz to 400 kHz" can deviate from the sum of the filtered values.

Frequency Analysis via AC Output

Even in a "normal" work and living environment it is possible to encounter a great variety of frequencies in addition to the power frequency 60 Hz or 50 Hz, respectively. For a more detailed analysis of the different frequencies, a spectrum analyzer can be connected directly to the AC output of the field meter by means of the supplied adapter. At the AC output a DC offset of maximum 50 mV is applied. It is standard in oscilloscopes and spectrum analyzers that this DC offset is usually suppressed by a capacitive coupling. In case the peripheral analysis instruments are connected to the power grid including grounding conductor, the grounding of the field meter should not be connected in order to avoid ground loops!

Following convention, the technical specifications of the field meter refer to the maximum values given on the display, according to which the bandwidth of the AC output is limited to 30 kHz. If, however, the measurement value is less than 1/20 of the maximum reading (e.g. in the measurement range 2000 nT this would equal 100 nT), there is still a sinusoidal input signal up to 400 kHz with a non-linearity < 1% provided at the AC output. Since the field strengths in home and workplace settings often are in this range and not that much higher, this output can actually be used up to 400 kHz then.

With a mono headset (adjustable volume is recommended) plugged into the AC socket, it is possible to perform a rough acoustic frequency analysis across the audible frequency range (ca. 16 Hz to 20 kHz). If needed, use adapter plug. The headset LS0002 is available as an accessory from

GIGAHERTZ SOLUTIONS

Data Logging via DC Output

The field strength of a given point in space often changes over a longer period of time. For a complete assessment, it is recommended to monitor the field strengths (DC values), for instance, for 24 hours. Therefore the field meter comes equipped with outputs where data logging and analy-

Measurement Instructions

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sis equipment can be connected. In general, the DC output (direct current output) is used for longterm monitoring with, for example, data loggers or data plotters.

Across the DC output a DC signal is applied, which is proportional to the measurement values. It equals minus 0.5 mV per digit. That would, for example, translate into minus 1 Volt at a maximum reading "2000 nT/Vm" or "200 nT/Vm". The negative signal was preferred over the positive signal because it clearly offered better linearity and correspondence with the display value. Most analysis instruments can internally convert the input signal into the appropriate absolute value. If this is not the case, simply reverse the polarity of the plug of the analysis instrument in order to display positive values. When using the BNC adapter, the shielding of the testing lead is connected to mass potential. Even though the maximum values of the display show either 2000 nT or 2000 V/m, the DC signal at the DC output is actually still quite linear up to 5000 nT or 5000 V/m, respectively. The technical specifications of the field meter refer to the values shown as maximum values on the display. As long as a jack plug is plugged into the DC socket, the "Auto-Power-Off" function is deactivated in order to accommodate long-term data logging. Caution: If during data logging the battery runs so low that "low Batt." is displayed, the "AutoPower-Off" function will be activated in order to prevent the battery from becoming completely discharged, which otherwise might destroy the rechargeable battery.

24-hour data logging can be supported through a connection to the electric power system via the adapter or a 12 V battery. In the event a power outage occurs during data logging, the rechargeable battery in the instrument will take over automatically. As soon as electric power comes back on, the instrument will automatically switch back to the adapter. Place the adapter as far away from the field meter as possible in order to keep the detection of its emissions as low as possible. By making note of the field strength with and without having the adapter plugged into the outlet, it is possible to calculate the correction value, which of course should be subtracted from the total measurement values.

Changing Batteries

Opening the Case

Turn off the field meter and disconnect all extension cords plug-

ged into it. Having the labeled side facing up toward you, hold the

field meter in your hand or put it down on a table.

Use the supplied wedge to open the case.

Picture 23

1.While opening the case, hold the instrument firmly in one hand and with the other insert the wedge into the notch on the side, about 1 cm (1/2") below the upper corner, and press the wedge down on its thick end. There the lid will then lift slightly. Picture 23.

Picture 24

Measurement Instructions

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2.The same procedure shall be repeated on the same side, but this time about 1 cm (1/2") above the lower corner. Picture 24

Now the cover is open on one side.

Picture 25

3.Points 1 through 2 will also have to be repeated on the opposite side. Pictures 25 and 26

Now the cover can be easily lifted off.

Picture 26

Closing the Case

Place the cover flush with the open field meter. Ensure that the battery check button, the light diode and the frequency filter button all fit snugly into their designated openings in the cover. Using thumbs and pointing fingers of both hands, press down on the cover with a steady and gentle pressure. As a result, the cover will snap into its place on both sides. Picture 27

Picture 27

Removing Batteries

Change batteries only while the instrument is turned off!

After having opened the cover, the rechargeable battery including its clip can be removed or lifted out sideways.

In order to remove the battery clip from the rechargeable battery, slip the small end of the wedge as far up between both contacts as possible, then move the wide end of the wedge up and down. Thus the clip can be easily detached. Picture 28

Picture 28

Under no circumstances ever pull at the leads or the plastic clip of the contacts; otherwise they can easily be damaged or broken.

Inserting Batteries

Attach the new rechargeable battery to the battery clip and place it back into the battery compartment. While putting the battery back into the compartment, ensure that none of the battery

Changing Batteries

GIGAHERTZ

SOLUTIONS

leads will get trapped between the battery and some protruding part from the circuit board. In this case you would be unable to slide the cover back properly.

In order to replace the supplied frequency filter with another one from GIGAHERTZ SOLUTI-

ONS®, please follow the instructions enclosed with the new frequency filter.

Battery Management

Operating Time:

Immediately after having recharged the supplied battery for a total of 11 continuous hours, it can be operated continuously for about 8 hours.

Battery Charging:

First, plug the supplied or a similar power adapter into an outlet. Insert the low-voltage jack of the power adapter into the designated socket (upper left).

Caution: Take great care that the polarity of the adapter ((+) internal conductor and (-) external conductor) as well as the corresponding voltage (12-24 VDC) are correct!

In order to start charging the battery, turn on field meter and then off just once. After that leave it turned off.

The green light of the diode will shine during the charging. After about 11 hours the charging mode will be turned off automatically.

Low Batt.:

1.When the field meter is turned on and the two dots appear in the display (low batt.), the battery is in a low state. Using the meter in this condition will cause measuring errors. Picture 29

But even before the low-battery indicator comes on, you can find out the charge status of the battery with the "Batt. Check" by pressing the respective button.

Picture 29

Auto-Power-Off

This function conserves energy and extends the total operating time.

1. In case you forgot to turn off the field meter or it was accidentally turned on during transport, it will be automatically shut off after 40 minutes of continuous use.

Battery Management

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SOLUTIONS

2. When two dots appear in the center of the display (low batt.), the field meter will be turned off

after 3 min in order to protect the rechargeable battery from becoming completely discharged, which would cause damage.

In order to turn on the field meter after an Auto-Power-Off, simply turn it off and on again.

Caution: If the DC signal output is connected, the normal Auto-Power-Off function is disabled.

This way it becomes possible to perform data logging supported by the rechargeable battery, up to 8 hours. The low-battery shut-off, however, will kick in after 3 min just the same in order to protect the rechargeable battery from the damages of a complete (deep) discharge.

With an alkaline battery, it is possible to perform 24-hour data logging.

Caution: If an alkaline battery is being used, under no circumstances ever should the power

adapter be connected at the same time. Otherwise the battery may explode.

Checking Battery Status and Display-Check

Since the integrated rechargeable battery is not always charged completely, it is possible to find out the remaining operating time as well as the proper functioning of all display segments by pressing the "Batt.-Check" button.

1.In order to check the battery status, simply turn on the field meter, press the button and continue to keep it pressed. If the display shows "1999" or "1888," the instrument is optimally supplied with power and all display elements function accurately. Picture 30.

Picture 30

2.When the instrument is turned on and the low battery button is pressed, “low batt.” in the center of the display indicate that under normal conditions the operating time will be less than 1 hour. Picture 31

If need should be, recharge battery or turn off field meter.

Picture 31

Contact:

Gigahertz Solutions GmbH For your local distributor please contact Am Galgenberg 12 www.gigahertz-solutions.com D - 90579 Langenzenn Germany Phone +49 (9101) 9093-0 Fax +49 (9101) 9093-23 www.gigahertz-solutions.com

Battery Management

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Press the button!

Technical data

GIGAHERTZ

SOLUTIONS

DRU0147a KW482006

ME 3951A

mit F1B2H31

Professional Dual Function - Gauss/Tesla meter for AC electric and AC magnetic fields 5 Hz to 400 kHz with integrated Frequency Filter Module

magnetic flux density electric field strength

one dimension in nT/mG against ground potential in V/m

Frequency Range 5 Hz to 400 kHz 5 Hz to 400 kHz

(-1 dB limit) (-1 dB limit)

Range Selection 200,0 nT 2000 nT 200,0 V/m 2000 V/m Resolution* 0,1 nT 1 nT 0,1 V/m 1 V/m basic tolerance* ± 2 % ± 2 % ± 2 % ± 2 %

(50 Hz tracable calibrated normal)

Linearity Deviation* ± 0,3 nT ± 3 nT ± 0,2 V/m ± 0,2 V/m

(at 50 Hz)

Offset* ± 0,4 nT ± 4 nT ± 0,4 V/m ± 0,4 V/m

(at 50 Hz)

Power Supply 15 - 20 mA, according to the mode of operation

Further functions and equipment

33..55--ddiiggiitt LLCCDD

easy to read display, indication of field type

being measured and low Batt. Tone signal proportional to field strength. SSiiggnnaall oouuttppuuttss

for AC-signals up to 30 kHz and DC-signals. To connect for ex. data loggings, plotters or head phones for acoustic frequency analysis.

Test mode to correct

OOffffsseett

IInnssttrruummeenntt CCoonntteennttss

·· 1166 HHzz bbaanndd ppaassss ffiilltteerr

4th order, Q-Factor 10, be selected

·· 5500 HHzz hhiigghh

ppaassss ffiilltteerr

5th order, be selected

·· 22 kkHHzz hhiigghh ppaassss ffiilltteerr

5th order, be selected

··

High flexible grounding lead (5 m) to measure electric field strength.

·· BBNNCC mmeeaassuurreemmeenntt aaddaapptteerr

to connect with a spectru ana-

lyzer

·· DDeettaaiilleedd ssppeezziiffiiccaattiioonnss

and

uusseerr’

’ss gguuiiddee

Power Supply

Integrated rechargeable battery with a soft

bbaatttteerryy cchhaarrggee

mmaannaaggeemmeenntt

, to protect from becoming completely dischar-

ged or overcharged. Operating time 8 hours according to the mode of operation. BBaatttteerryy llooww iinnddiiccaattoorr

and

aauuttoo ppoowweerr ooffff

function (auto power

off is not active when data logging). 1122 VVDDCC aaddaapptteerr

to charge the rechargeable battery included.

Optional Accessories

CCaalliibbrraattiinngg CCeerrttiiffiiccaattee

( calibration periode: 1 year). Stable plastic box with protectors. External

eexxttrraa rreecchhaarrggeeaabbllee bbaatttteerryy

with high capacity for data

loggings (> 48 hours) Extra,

eexxtteerrnnaall DDiissppllaayy MMeetteerr

to measure in areas with difficult or no entries or for observation the measurement by a 2nd person.

Retrofitable

FFrreeqquueennccyy FFiilltteerr

MMoodduull

with extra switchable limit-

ing frequencies.

Guaranteed Quality

Innovative electronics, patented technology. DDuurraabbllee pprreecceessssiioonn tthhrroouugghh sseellff ccaalliibbrraattiinngg cciirrccuuiitt eelleemmeennttss

MMaaddee iinn GGeerrmmaannyy,, ssttaattee ooff tthhee aarrtt SSMMD

MMaannuuffaaccttuurriinngg pprroocceessss

High end components, FR4 material and reproducible manufacturing methods.

22 YYeeaarrss WWaarrrraannttyy oonn mmaannuuffaaccttuurriinngg ddeeffeeccttss

Technical data

* At 20°C and 45% of the relative air humidity

Measuring procedures according to the international. Recognized standards of workstations (TCO and MPR).

Dimensions 74 x 122 x 31 mm, weight appr. 196 grams.

ohne_Filter 100,0V/m Filter 1 100,0V/m Filter 2 100,0V/m Filter 3 100,0V/m -1dB 100,0V/m -3dB 100,0V/m

120

100

[V/m]

electric field strength

1 10 100 1000 10000 100000 1000000

Typical frequency response curve

frequency [Hz]

600

500

400

300

[nT]

200

100

magnetic flux density

ohne_Filter 500nT Filter 1 500nT Filter 2 500nT Filter 3 500nT -1dB 500nT -3dB 500nT

1 10 100 1000 10000 100000 1000000

frequency [Hz]

Gigahertz Solutions HF58B-r User guide

Specifications and Main Features

Frequently Asked Questions

User Manual