Performing measurements
R&S
®
NRPM
58
Mannual 1425.8663.02 ─ 08
7
Performing measurements
7.1
Sensor module readings
The antenna modules R&S
NRPM-A90 and R&S
NRPM-A90D have an integra-
ted diode detector each that converts the RF signal and transmits it directly to the
sensor module.
You can measure the power of the incident electromagnetic wave towards the
antenna module in various quantities:
●
Equivalent isotropically received power P
ISO
= P
i
in W or dBm (default):
Equivalent detected power of an isotropic antenna with an ideal power detec-
tor at the phase center location of the antenna module assuming radiation
only from boresight direction.
●
Power at the internal RF detector in W or dBm: The measurement result with-
out including antenna gain and frequency-dependent calibration factors.
P
Det
=(G
RF,i
/k
att,A,i
(f))
·
P
ISO
●
Power density S in W/m
2
, calculated as:
S=(4
π
/
λ
2
)
·
P
ISO
●
Electric field strength E
eff
in V/m, calculated as:
E
eff
=
√
(S
·
Z
0
)
with: Z
0
=376.73
Ω
.
●
Magnetic field strength H
eff
in A/m, calculated as:
H
eff
=
√
(S/Z
0
)
with: Z
0
=376.73
Ω
.
► To convert the data, use the remote command:
7.2
Measurement applications
For power measurement with the R&S
NRPM3(N), you can either use the PC
application R&S
Power
Viewer, the WebGUI (Web Browser-Based User Interface)
or an application that supports direct remote control of the sensor module.
Measurement applications
