Gigahertz Solutions HFW59D Bedienungsanleitung Seite 25

The optional HF preamplifier HV20_2400G10, to be used as plug-in
into the antenna input socket, increases the sensitivity by a factor of
100. With the help of this, the meter reaches a theoretical minimum
resolution of 0.01 µW/m². The realistic minimum resolution is slightly
lower due to the noise margin.
Measurement ranges of the HFW59D
Instrument as delivered,
i.e. without preamplifier or attenuator
("ext. adapt." to "0 dB")
Displayed value & unit
Range
max 0.01 - 19.99
min 1 - 1999
Simply read out, no correction factor
With ext. Attenuator DG20,
("ext. adapt." to "-20 dB")
Displayed value & unit
Range
max 1 - 1999
min 0.1 - 19.99
Simply read out, no correction factor
With ext. Preamplifier HV20,
("ext. adapt." to "+20 dB")
Range Displayed value & unit
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 density 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 build-
ing biology.
© Gigahertz Solutions GmbH
mW/m²
µW/m²
mW/m²
mW/m²
µW/m²
µW/m²
M a d e in G e r m a n y
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