Rohde & Schwarz NRP-Z28 User manual

1170.8966.12-081
Operating Manual
Level Control Sensor
R&SNRP-Z28
1170.8008.02
R&SNRP-Z98
1170.8508.02
Test and Measurement

1170.8966.12-082
Dear Customer,
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG
Trade names are trademarks of the owners.

R&S NRP-Z28/Z98 Safety Information
1170.8966.12 I E-1
Safety Information
Safety information is part of the product documentation. It warns you of potential dangers and gives
instructions on how to prevent personal injury or damage caused by dangerous situations. Safety
information is provided as follows:
•In the Getting Started manual, Chapter 1.1 “Safety instructions”. The same information is provided in
many languages as printed "Safety Instructions". Both documents are delivered with the power
sensor.
•Throughout the documentation, safety instructions are provided when you need to take care during
setup or operation.

R&S NRP-Z28/-Z98 Table of Contents Chapter 1
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Table of Contents
1Putting into Operation......................................................................................................1.1
Unpacking the sensor......................................................................................................................1.1
Connecting the sensor ....................................................................................................................1.1
Operation with the R&S NRP/NRP2 power meter .........................................................................1.3
Connecting the power sensor.....................................................................................................1.3
Performing measurements .........................................................................................................1.4
PC control .........................................................................................................................................1.5
Hardware and software requirements ........................................................................................1.5
Operation via the R&S NRP-Z4 passive USB adapter...............................................................1.7
Operation via the R&S NRP-Z3 active USB adapter..................................................................1.7
Operation via the R&S NRP-Z5 Sensor Hub..............................................................................1.9
Equipment Supplied and Alternative Accessories ............................................................. 1.9
Ports and LEDs................................................................................................................ 1.10
Test Setup........................................................................................................................ 1.11
Troubleshooting ............................................................................................................... 1.13
Connecting the sensor to the source and the DUT ..................................................................1.14
Performing measurements .......................................................................................................1.14
Operation with other Rohde & Schwarz test instruments..........................................................1.15
Hardware and software requirements ......................................................................................1.15

List of Figs. Chapter 1 R&S NRP-Z28/-Z98
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Figs.
Fig. 1-1 Configuration with the R&S NRP/NRP2 ............................................................................ 1.4
Fig. 1-2 Displaying the total available power of a USB port............................................................ 1.6
Fig. 1-3 Power measurement on PC with the R&S NRP-Z4 passive USB adapter........................ 1.7
Fig. 1-4 Power measurement on PC with the R&S NRP-Z3 active USB adapter........................... 1.7
Fig. 1-5 Changing the primary adapter ........................................................................................... 1.8
Fig. 1-6 Ports and LEDs on front panel......................................................................................... 1.10
Fig. 1-7 Ports on rear panel........................................................................................................... 1.10
Fig. 1-8 Unlatching the R&S Instrument connector....................................................................... 1.11
Fig. 1-9 Typical test setup with R&S NRP-Z5 and PC.................................................................. 1.12
Fig. 1-10 Changing the view in Device Manager ............................................................................ 1.13
Fig. 1-11 Identification of USB root hub on which R&S NRP-Z5 is operated ................................. 1.13
Fig. 1-12 Deactivation of Selective Suspend for a USB root hub ................................................... 1.14

R&S NRP-Z28/-Z98 Connecting the sensor
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1 Putting into Operation
NOTICE
Follow the instructions below precisely to prevent damage to the sensor –particularly
when you are putting the power sensor into operation for the first time.
Unpacking the sensor
Remove the power sensor from its packing and check that nothing is missing. Inspect all items for
damage. If you discover any damage, inform the carrier responsible immediately and keep the packing
to support any claims for compensation.
It is also best to use the original packing if the power sensor is to be shipped or transported at a later
date.
The power sensor contains components which can be destroyed by electrostatic
discharges. To prevent this from happening, never touch the inner conductor of the RF
connector and never open the power sensor.
Connecting the sensor
NOTICE
To prevent EMI, the power sensor must never be operated with its enclosure wholly or
partially removed. Only use shielded cables that meet the relevant EMC standards.
Never exceed the maximum RF power limit. Even brief overloads can destroy the
integrated power sensor.
To prevent erroneous measurements, always terminate the RF output of the power sensor
(at the cable end) with a matched load or matched measuring instrument input.
In many cases, the RF connector only requires manual tightening. However, for maximal
measurement accuracy, the RF connector must be tightened using a torque wrench with a
nominal torque of 1.36 Nm (12" lbs.).

Connecting the sensor R&S NRP-Z28/-Z98
1170.8966.12 1.2 E-6
!!
Do not apply excessive mechanical force to the RF
connectors of the R&S NRP-Z28/-Z98 and DUT!
FF
FF

R&S NRP-Z28/-Z98 Connecting the sensor
1170.8966.12 1.3 E-6
Make sure the bending radius of the RF connecting
cable is at least 50 mm!
A tighter bend can permanently impair the
matching of the RF input!
Operation with the R&S NRP/NRP2 power meter
Connecting the power sensor
The power sensor can be connected to the R&S NRP/NRP2 base unit when it is in operation. The
multiple circular plug-in connector must be inserted, red marking upwards, into one of the
R&S NRP/NRP2 base unit’s sensor connectors. When the power sensor is connected, it is detected by
the R&S NRP/NRP2 base unit and initialized.
Connect the RF connector of the connecting cable to the output of a signal source, and connect the RF
connector of the power meter to the input of the DUT. To screw on the power sensor more easily and
without tilting it, slightly lift it.
> 100 mm
!!

Connecting the sensor R&S NRP-Z28/-Z98
1170.8966.12 1.4 E-6
Fig. 1-1 Configuration with the R&S NRP/NRP2
Performing measurements
The R&S NRP-Z28/-Z98 power sensors behave in a similar manner as the R&S NRP-Z21 and
R&S NRP-Z91 multipath diode sensors. Unlike these, however, instead of the power fed to the sensor,
the power Psupplied to the DUT is measured. By means of the S-parameter correction function,
adapters or attenuators connected ahead of the DUT can be taken into consideration. The gamma
correction function allows the influence of a mismatched DUT to be reduced.
G
DUT
R&S NRP/NRP2
R&S NRP-Z28/-Z98
P

R&S NRP-Z28/-Z98 Connecting the sensor
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PC control
Hardware and software requirements
The following requirements must be met if the power sensor is to be controlled by a PC via an interface
adapter:
The PC must have a USB port.
Either Microsoft Windows XP (32 Bit), Microsoft Windows Vista (32 or 64 Bit), Microsoft Windows 7
(32 or 64 Bit), or x86 Linux (with kernel 2.6.8 oder more recent) must be installed as the operating
system of the PC. 64-bit versions of Microsoft Windows XP are not supported. Operation with older
versions of Microsoft Windows with USB support (especially Microsoft Windows 2000) is normally
possible but cannot be guaranteed.
The USB device drivers in the supplied NRP Toolkit software package must be installed.
If these requirements are met, the power sensor can be controlled using a suitable application program
such as the NrpFlashup program contained in the Microsoft Windows version of the NRP Toolkit
(includes the modules Power Viewer, USB Terminal, Firmware Update and Update S-Parameters).
When you insert the CD-ROM supplied with the R&S NRP power sensor, the NRP Toolkit is
automatically installed on your PC. The rest of the procedure is self-explanatory.
The power sensor can be powered in two ways:
Self-powered from a separate power supply via the Active USB Adapter R&S NRP-Z3 or the
Sensor Hub R&S NRP-Z5.
Bus-powered from the PC or a USB hub with its own power supply (self-powered hub) via the
Active USB Adapter R&S NRP-Z3 or via the Passive USB Adapter R&S NRP-Z4.
As the power sensor is a high-power device, there is no guarantee that it can be powered from all types
of laptop or notebook in the bus-powered mode. To be sure, you should determine the current at the
USB connectors beforehand:

Connecting the sensor R&S NRP-Z28/-Z98
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In the Windows™ start menu, select Settings –Control Panel
Select the System icon
Select the Hardware tab
By clicking on the button of that name, start the Device Manager
Open USB Controller (all USB controllers, hubs and USB devices are listed here)
Double-click USB Root Hub or select Properties in the context menu (use the right-
hand mouse button)
Select the Power tab (Fig. 1-1). If the hub is self-powered and the total power
available is, as indicated by Hub Information, 500 mA per port, high-power devices
can be connected.
Fig. 1-2 Displaying the total available power of a USB port
If you have any doubts, ask the manufacturer if the USB port on your laptop or notebook can handle
high-power devices.

R&S NRP-Z28/-Z98 Connecting the sensor
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Operation via the R&S NRP-Z4 passive USB adapter
Fig. 1-3 is a schematic of the measurement setup. The order in which the cables are connected is not
critical.
Fig. 1-3 Power measurement on PC with the R&S NRP-Z4 passive USB adapter
Operation via the R&S NRP-Z3 active USB adapter
Fig. 1-4 shows the configuration with the R&S NRP-Z3 active USB adapter. The order in which the
cables are connected is not critical.
Fig. 1-4 Power measurement on PC with the R&S NRP-Z3 active USB adapter
The plug-in power supply for the R&S NRP-Z3 can be powered from a single-phase AC source with a
nominal voltage range of 100 V to 240 V and a nominal frequency between 50 Hz and 60 Hz. The plug-
in power supply autosets to the applied AC voltage. No manual voltage selection is required.
The plug-in power supply comes with four primary adapters for Europe, the UK, the USA and Australia.
No tools of any kind are required to change the primary adapter. The adapter is pulled out manually and
another adapter inserted until it locks (Fig. 1-5).
DUT
G
P
Ext. triggering
(optional)
(not included in delivery)
BNC cable
Plug-in power supply
(optional use)
G
R&S NRP-Z28/-Z98
G
DUT
P
R&S NRP-Z4
R&S NRP-Z28/-Z98
USB
TTL /
CMOS
R&S NRP-Z3

Connecting the sensor R&S NRP-Z28/-Z98
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Fig. 1-5 Changing the primary adapter
The plug-in power supply is short-circuit-proof and has an internal fuse. It is not possible to replace this
fuse or open the plug-in power supply.
NOTICE
The plug-in power supply is not intended for outdoor use.
Keep within the temperature range of 0 °C to 50 °C.
If there is any condensation on the plug-in power supply, dry it off before connecting it to
the AC supply.

R&S NRP-Z28/-Z98 Connecting the sensor
1170.8966.12 1.9 E-6
Operation via the R&S NRP-Z5 Sensor Hub
The R&S NRP-Z5 sensor hub allows up to four power sensors to be operated on one PC. It combines
the following functions:
4-port USB 2.0 hub
Power supply
Through-wired trigger bus
Trigger input and trigger output via BNC sockets
Equipment Supplied and Alternative Accessories
The following equipment is supplied:
Sensor hub
External power supply
Power cable
USB cable
Instead of the supplied, 2 m long USB cable, it is possible to use any other USB-2.0-certified cable
(USB connector type A to USB connector type B) with a maximum length of 5 m. If a locking connection
is required at the instrument end, it is also possible to use the passive R&S NRP-Z4 interface adapter
instead of a standard USB cable.
As an alternative to the supplied external power supply, power can also be supplied using a DC voltage
source with an output voltage of 12 V to 24 V and a power output of at least 24 W. Make sure that the
polarity is correct (positive pole inside, negative pole outside). The alternative DC voltage source must
be in the same building as the R&S NRP-Z5 and must be connected to the latter via a cable with a
maximum length of 30 m. Power must not be supplied from a low-voltage supply system.
The supplied external power supply is short-circuit-proof and is also protected by an internal fuse. It is
not possible to change the fuse or open the unit.
NOTICE
The external power supply is not intended for outdoor use.
Keep within the temperature range of 0°C to 50°C.
If there is any condensation on the external power supply, dry it off before connecting it
to the AC supply.

Connecting the sensor R&S NRP-Z28/-Z98
1170.8966.12 1.10 E-6
Ports and LEDs
The power sensors are connected to the front panel of the R&S NRP-Z5. The ports and LEDs on the
front panel of the R&S NRP-Z5 are shown in Fig. 1-6.
1–4
Sockets for connecting the power sensors
5–8
Green LEDs for indicating normal operation
9–12
Yellow LEDs for indicating faults
Fig. 1-6 Ports and LEDs on front panel
On the rear panel are the ports for power supply, USB host, trigger input and trigger output. The ports
on the rear panel are shown in Fig. 1-7.
1
Trigger output (BNC socket)
2
Trigger input (BNC socket)
3
Plug allowing connection to Rohde & Schwarz measuring instruments (via R&S NRP-Z2) or to
a PC (via R&S NRP-Z4)
4
USB socket (type B) for connection to the USB host (PC or Rohde & Schwarz measuring
instrument without sensor socket)
5
Power supply socket (supplied external power supply unit or alternative power supply (12 V to
24 V/24 W))
Fig. 1-7 Ports on rear panel

R&S NRP-Z28/-Z98 Connecting the sensor
1170.8966.12 1.11 E-6
Unlatch the R&S Instrument connector on the rear panel by
pressing down the unlatching ring of the built-in
plug and pulling off the cable jack at the same
time (Fig. 1-8).
Fig. 1-8 Unlatching the R&S Instrument connector
Test Setup
Fig. 1-9 shows a typical test setup:
1
R&S NRP-Z5 sensor hub
2
External power supply unit (supplied)
3
Power cable (supplied)
4
AC power supply
5
USB cable (supplied)
6
PC with USB host port
7, 8
BNC cable (optional, not supplied)
9
Trigger source (optional)
10
Triggered device (optional)
11-14
R&S NRP-Zxx power sensors (one to four sensors)
15
Signal source
16
DUT
The sequence in which the cables are connected is not important.
As already mentioned in section Ports and LEDs, the R&S NRP-Z4 passive interface adapter can also
be used as an alternative to a standard USB cable for connecting to the PC. This adapter is connected
to the R&S Instrument port. Simultaneous operation at two USB hosts is not possible as the USB host
connected to the R&S Instrument port always has priority.
It is possible to cascade several R&S NRP-Z5 sensor hubs by connecting the R&S Instrument port of
an R&S NRP-Z5 to one of the sensor ports of another R&S NRP-Z5. However, external triggering and
the use of the Trigger Master function are then not possible. Instead, it is recommended to connect all
R&S NRP-Z5 hubs individually to the USB host or to an interposed USB hub, and to feed the external
trigger signal to all R&S NRP-Z5 hubs via their trigger inputs; or to forward the external trigger signal
from the trigger output of the R&S NRP-Z5 to which the Trigger Master is connected to the trigger
inputs of the other R&S NRP-Z5 hubs.

Connecting the sensor R&S NRP-Z28/-Z98
1170.8966.12 1.12 E-6
Fig. 1-9 Typical test setup with R&S NRP-Z5 and PC

R&S NRP-Z28/-Z98 Connecting the sensor
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Troubleshooting
A frequent problem, especially in the case of operation under Microsoft Windows XP, is that the
R&S NRP-Z5 fails to respond after a power sensor connected to the R&S NRP-Z5 is disconnected and
reconnected. It is then necessary to restart the PC.
This problem is not specific to the R&S NRP-Z5, but occurs with all USB hubs. You can try to eliminate
the problem by switching off the Selective Suspend for the USB port of the PC on which the R&S NRP-
Z5 is operated. The following step-by-step description is based on an English version of Windows XP:
1. Connect the R&S NRP-Z5 and put it into operation. Connect at least one power sensor.
2. Start the Device Manager and change the view by selecting View - Devices by connection
(Fig. 1-10).
Fig. 1-10 Changing the view in Device Manager
3. Now identify the USB root hub on which the R&S NRP-Z5 is operated. To do so, expand the
hierarchical display of the PC components, as shown in Fig. 1-11. Under PCI bus, find the USB
host controller to whose root hub the R&S NRP-Z5 is connected. The R&S NRP-Z5 is shown as the
Generic USB Hub. It can be distinguished from other USB hubs by the power sensor connected to
it.
Fig. 1-11 Identification of USB root hub on which R&S NRP-Z5 is operated

Connecting the sensor R&S NRP-Z28/-Z98
1170.8966.12 1.14 E-6
4. Double-clicking USB Root Hub opens the USB Root Hub Properties dialog box. Select the Power
Management tab. Remove the check mark next to Allow the computer to turn off this device to
save power and confirm this with OK.
Fig. 1-12 Deactivation of Selective Suspend for a USB root hub
Connecting the sensor to the source and the DUT
Connect the RF connector of the connecting cable to the output of a signal source, and connect the RF
connector of the power meter to the input of the DUT. By slightly lifting the power sensor, you can screw
it on more easily without tilting it.
Performing measurements
The R&S NRP-Z28/-Z98 power sensors behave in a similar manner as the R&S NRP-Z21 and
R&S NRP-Z91 multipath diode sensors. Unlike these, however, instead of the power fed to the sensor,
the power Psupplied to the DUT is measured. By means of the S-parameter correction function,
adapters or attenuators connected ahead of the DUT can be taken into consideration. The gamma
correction function allows the influence of a mismatched DUT to be reduced.