Chapter 12 EMF (EMI) Operation
EMF measurements with the 9102
194 9102 Handheld Spectrum Analyzer Software version 5.31
EMF measurements with the 9102
As explained the 9102 in conjunction with the 9131 EMF Measurement
Option and it’s antenna acessory range provides you with a measure-
ment solution suitable for performing EMF measurements according to
your specific measurement requirements.
In EMF (EMI) mode the 9102 measures the electrical field strength (E)
as well as the power density (S) to enable you to compare the
measured EMF with the binding limits specified by the responsible
regulatory bodies. You can specify which result should be displayed.
For further details on specifying the value to be displayed in your EMF
measurement refer to “Specifying the display calculation” on
page 202.
The display unit for the electrical field strength is V/m.
The electrical field strength is calculated as the square root taken from
S × R
0
, with R
0
being the air wave resistance of 377 .
The 9102 displays the total electrical field strength by adding all mea-
surement values measured for the three directions x, y, z.
E
result
is calculated as the square root taken from E
xresult
2
+ E
yresult
2
+
E
zresult
2
.
The display unit for the power density is W/m
2
.
It is calculated as S = E
r
2
÷ R
0
. R
0
again being the air wave resistance
of 377
.
The following sections explain how to perform EMF measurements
with the 9102 differentiating between auto and quick mode used for
automatic measurements involving the 9171 Isotropic Antenna and
manual mode used for manual measurements involving the 9170
Biconical Antenna. The preparative steps which have to be performed
before starting the actual measurement, e.g. selecting the EMF (EMI)
measurement mode, setting the required frequency range, selecting
the measurement unit and specifying the measurement result to be
displayed (power density or field strength) are identical for both
Nominal impedance 50
VSWR (typically) < 2.0
RF connector N female
Polarisation Linear (vertical/horizontal)
Calibration CISPR
Pole clamp 5/8“ UNC thread 37 mm
round flange
Size (length x width) 1 m x 0.55 m
Weight 2.4 kg
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