Field-Strength Measurement with Isotropic Antenna
R&S FSH
1145.5973.12 4.126
E-11
Field-Strength Measurement with Isotropic Antenna
When used together with the R&S TS-EMF isotropic antenna (Order No. 1158.9295.13), the R&S FSH3
can determine the resultant field strength in the frequency range from 30 MHz to 3 GHz. The antenna
has three orthogonal elements for measuring the resultant field strength. The R&S FSH triggers the
three antenna elements one after the other via the probe power socket and calculates the resultant field
strength (r = resultant field strength ) E
r
from the results of the three individual measurements:
E
E
E
E
z
y
x
r
2
2
2
+
+
=
The transducer factors for each antenna element and the cable loss of the antenna cable are
compensated in the measurement. If an extension cable such as the R&S TS-EMFZ2 (1166.5708.02) is
used, the additional cable loss can be taken into account by using transducer factors. The transducer
factors are antenna-specific and are supplied together with the TS-EMF antenna. Transducers are
loaded into the R&S FSH by means of the R&S FSH View control software (see also "Measuring with
Transducer Factors" in this chapter).
Connecting the antenna to the R&S FSH
The isotropic antenna includes factory-attached cables. The RF cable with the N coaxial plug is
connected to the input of the R&S FSH. The control cable for switching between the X, Y and Z axes
with the 9-pin D-Sub plug is connected with the R&S RSH probe power socket by using the supplied
adapter cable.
Press the MEAS key.
Press the MEASURE softkey.
The R&S FSH will open the measurement function
menu.
Select ISOTROPIC ANTENNA with the cursor keys
or rotary knob and confirm with the ENTER key or
the MEAS softkey.
The R&S FSH will open the measurement function
menu and activate the Isotropic Antenna measurement
function. Before displaying final measurement results,
the R&S FSH performs a measurement for each of the
three antenna axes so that the update rate of the trace
decreases accordingly.
