Gigahertz Solutions HFW59D Instruction Manual page 11

Instrument as delivered,
i.e. without preamplifier or attenuator
("ext. adapt." to "0 dB")
Range Displayed value & unit
max 0.01 - 19.99
min 1 - 1999
Simply read out, no correction factor
With ext. Attenuator DG20,
("ext. adapt." to "-20 dB")
Range Displayed value & unit
max 1 - 1999
min 0.1 - 19.99
Simply read out, no correction factor
With ext. Preamplifier HV20,
("ext. adapt." to "+20 dB")
Displayed value & unit
Range
max 0.1 - 199.9
min
0.01 - 19.99
Simply read out, no correction factor
Setting:
"Signal"
Peak / RMS
The following illustration shows the difference in the evaluation of
a pulsed signal if displayed as an average value reading or a peak
value reading ("RMS" and "Peak"):
HF-energy in µW/qm
peak value: 10
avg. value: 1
e.g. 1 pulse every 10 µS
With the switch set to "Peak", the meter will display the full power
flux density of the pulse (10 µW/m² in the graph). With the switch
set to "RMS", the meter will take the mean of the power flux den-
sity over the total period of time, for instance 1 µW/m² in the
above graph (=((1x10)+(9x0))/10).
With the switch set to "Peak" or "Peak hold", the display will show
the "RMS value during the pulse", which is a common practice in
the building biology.
Nevertheless, the "true" mean value is of great interest, too:
 The "official" limit values are always based on mean value ex-
aminations. When analysing "official" measurement results,
© Gigahertz Solutions GmbH
mW/m²
µW/m²
mW/m²
mW/m²
µW/m²
µW/m²
Made in Germany
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