User manual

ManualsBrandsGIGAHERTZ SOLUTIONS ManualsRadiation MeasurementHF58B-r -Analyser, Electric smog meter,

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

. Theoreti-

cally the HF58B-r would have a minimum

sponding reading with setting "Medium". Numerical

example: In "Medium" you read 150.0 µW/m². In

"Coarse" you could read up to 0.6 mW/m² or down to

0.03 mW/m² in an extreme case. Normally the differ-

ences shown will be much smaller.

The power level adaptor switch is provided for the

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.

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:

• TPmax (Radar) : Approx. 1 nW/m²

• TP 30kHz (Standard) : Approx. 0.1

nW/m².

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

avg. value: 1

e.g. 1 pulse every 10 µS

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”.

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.