Rohde & Schwarz NRPM OTA Power Measurement Solution, Manual

Page: 20 / 229

Preparing for use
R&S
®
NRPM
20 Mannual 1425.8663.02 ─ 08
4.4 Powering the R&S NRPM3(N) sensor module
The electrical power for a R&S NRPM3(N) sensor module is supplied over one of
the following interfaces:
●
Host interface
See
"Host interface connector (3)" on page 30.
●
LAN PoE interface
Only available for R&S
NRPM3N sensor modules, see "LAN PoE interface (6)"
on page 31.
If you use the Ethernet interface of the R&S NRPM3N sensor module, you
have to provide the electrical power by power over Ethernet (PoE). In this
case, you
cannot provide the electrical power over the host interface
instead.
Choose the PoE power sourcing equipment (PSE) with care
Only use PoE power sourcing equipment (PSE) as specified in the IEEE stand-
ards 802.3af or IEEE 802.3at. Otherwise, the following can happen:
●
If too much power is supplied, the R&S NRPM3N sensor module can get
overheated and become damaged as a result.
●
If the supplied power is not sufficient, the R&S NRPM3N sensor module does
not work properly or not at all.
4.5 Hardware and software requirements
4.5.1 Hardware
The basic measurement equipment for an OTA power measurement with the
R&S
NRPM consists of:
●
Three channel sensor module R&S NRPM3N or R&S NRPM3.
●
Antenna modules:
– R&S
NRPM-A90: one at a minimum, and three at a maximum per sensor
module.
Hardware and software requirements