Rohde & Schwarz R&S NRP User manual

1144.1400.12-04- 1
Test and Measurement
Division
Operating Manual
Power Meter
R&SNRP
1143.8500.02
Printed in the Federal
Republic of Germany

1144.1400.12-04- 2
Dear Customer,
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
Trade names are trademarks of the owners.

R&S NRP Supplement
1144.1400.12-04- Supplement 1 E-2
Supplement to Operating Manual R&S NRP
1144.1400.12-04-
Dear Customer,
Your power meter is equipped with firmware version ≥03.00. A number of functions have been modified
since the printing of the manual, and the modifications are described in the following.
Battery operation
The R&S NRP-B3 option allows the R&S NRP to be operated independently of the AC supply.
The batteryis automaticallycharged as soon as its residual capacityhas dropped below96% full
charge and the R&S NRP is connected to the AC supply.
A warning is displayed shortly before the battery is completely discharged. If the battery is fully
discharged, the R&S NRP automatically switches off to prevent any damage to the battery by over-
discharging. In this case, the battery should be recharged as soon as possible.
The charge status of the battery is displayed in the Battery dialog window and symbolically in every
expanded window. The Battery dialog window also provides information about the battery's remaining
operating time.
System menu:
Bat… –
( )
ä
Battery – Dialog
Remaining Capacity This line indicates the battery's remaining charge in percent.
Remaining Time of
Battery Operation
This line indicates the remaining operating time.
Note
After the operating status has been changed, it may take the display up
to one minute to be updated.
Running from Battery
or
Charging
or
Idle
This line indicates the battery's current operating status.
SystemÆBat…

Supplement R&S NRP
1144.1400.12-04- Supplement 2 E-2
The data sheet specifies how long the R&S NRP can be operated from the battery. The battery
operating time depends on the number and type of the connected sensors and especially on the
brightness of the display backlighting.
The battery can be charged at temperatures between 5°C and 30°C and discharged at temperatures
ranging from 0°C to 40°C. To prolong the life of the battery, however, the instrument should not be
operated too frequently at the upper limit temperatures. If the battery is charged at temperatures above
30°C, the charging process is repeatedly interrupted to allow cooling, which considerably extends the
charging time. If the temperature exceeds a value of about 35°C, charging is practically discontinued.
It is normal that battery charging continues after the battery has been charged 100%. To prolong the life
of the battery, this process should not be aborted.
Since NiMH batteries are subject to considerable self-discharging, an R&S NRP that is equipped with
the R&S NRP-B3 option should not be stored for more than three months without being connected to
the AC supply.
Caution
The performance of a "Smart Battery" may be manufacturer-specific. Only the original
battery will ensure correct functioning and a charging functionality that prolongs the life
of the option.
The safety test marks lose their validity if batteries from other manufacturers are used.
Calibrating the charge counter
From time to time, the battery must be calibrated so that the remaining operating time is not displayed
incorrectly as a result of the battery's decreasing capacity over time. A calibration cycle can
automatically take place in normal operation, if the R&S NRP is fully discharged after being fully
charged, without intermittently connecting the instrument to the AC supply. In this case, no further
action on the part of the user is required.
However, if calibration is not performed in normal operation, after some time the battery will request a
calibration cycle. This request will be displayed after the R&S NRP has been switched on.
Switch on the R&S NRP:
Request for a calibration cycle from the battery

R&S NRP Supplement
1144.1400.12-04- Supplement 3 E-2
(¶ MENU)
äThe calibration cycle is performed. First of all, the battery is fully
charged, then fully discharged and finally fully charged again. This
process may take between 11 and 20 hours depending on the charge
status of the battery at the beginning of the calibration cycle. The
higher the charge of the battery at the beginning, the faster the
calibration cycle is performed. Calibration itself takes place at the end
of the discharging process.
During the calibration cycle, or at least until the end of the discharging
phase, the R&S NRP should remain connected to the AC supply and
should always be on. Otherwise the calibration counter is not calibra-
ted, which means that the warning will be displayed again when the
R&S NRP is switched on the next time.
(ESC/LOCAL)
äThe calibration cycle is not performed. The warning will be displayed
again when the R&S NRP is switched on the next time.

R&S NRP Supplement
1144.1400.12-04- Supplement 1 E-1
Supplement to Operating Manual R&S NRP
1144.1400.12-04-
Dear Customer,
Your power meter is equipped with firmware version ≥03.00. A number of functions have been modified
since the printing of the manual, and the modifications are described on the following pages.
Ethernet
For remote control via a TCP/IP-based LAN, the R&S NRP can be fitted with an optional 10/100BaseT
Ethernet interface (option R&S NRP-B4). The socket is located on the rear panel of the R&S NRP. Via
this interface, a controller can remote-control the R&S NRP by means of the power meter's SCPI
commands, using the VXI11 protocol (TCP/IP instrument protocol specification), version 1.0, released
on 17 July 1995 by the VXIbus Consortium.
Ethernet connection socket

Supplement R&S NRP
1144.1400.12-04- Supplement 2 E-1
VXI11
The VXI11 protocol uses ONC RPC (open network computing remote procedure calls), making it
possible to call R&S NRP functions at the source code level as if they were running locally on the
controller. The following figure shows the relationships of the relevant protocol layers in the OSI
reference model.
A p p l i c a t i o n V X I 1 1 N e t w o r k I n s t r u m e n t
P r e s e n t a t i o n X D R ( D a t a r e p r e s e n t a t i o n )
S e s s i o n O N C R P C
T r a n s p o r t T C P
N e t w o r k I P
D a t a L i n k E t e r n e t / 8 0 2 . 3
P y s i c a l 1 0 / 1 0 0 B A S E - T
The VXI11 protocol stack in the OSI reference model
A VXI11 remote-control connection consists of three channels (core, abort and interrupt) which can be
used to set up as many links as desired. The concept of links makes it possible to connect a network
instrument client in a controller with a number of logical measurement devices in a host computer via a
single VXI11 remote-control connection. A link is then set up to each logical device. It is also possible to
set up several links to one logical device, provided that several servers are running on the network
instrument host or a network instrument client is being served by several controllers. To prevent
problems caused by several controllers simultaneously accessing one device, links can be locked. A
locked link has exclusive access rights to a particular device. Accesses via other links are then not
possible. An exception is an abort via the abort channel, which can be executed at any time and also
aborts the execution of commands via other links.
C o r e C a n n e l
A b o r t C a n n e l
I n t e r r u p t C a n n e l
L i n k 1
L i n k 2
L i n k n
L i n k 1 , L i n k 2 , L i n k n
N e t w o r k
I n s t r u m e n t
C l i e n t
C o n t r o l l e r
N e t w o r k I n s t r u m e n t H o s t
L i n k 1
L i n k 2
L i n k n
L i n k 1 , L i n k 2 , L i n k n
N e t w o r k
I n s t r u m e n t
S e r v e r
R & S N R P : N e t w o r k I n s t r u m e n t H o s t
D e v i c e
Diagram of a VXI11 connection with several links

R&S NRP Supplement
1144.1400.12-04- Supplement 3 E-1
Communication channels of a VXI11 connection
Channel Meaning
Core All client-server communication, excluding aborts and interrupts, is handled via this channel.
Abort Since the commands in the core channel are serialized and therefore cannot be interrupted,
asynchronous abort commands must be transmitted via a separate, independent channel. This
channel serves no further purpose.
Interrupt Service requests (SRQs) are reported to the network instrument client via this channel. As all links
share this channel, the client must subsequently determine which device triggered the SRQ by
polling the status bytes (device_readstb() function) of all connected devices.
Connection setup
A socket connection is set up for each channel. All commands via the core or abort channel contain an
ID that is used to assign the command to a link. The interrupt channel, which is also implemented using
sockets, is shared by all links. Commands transmitted via this channel do not contain a link ID. The
setup is handled by the network instrument client, which first requests the connections from the network
instrument server's portmapper service at port 111. The portmapper subsequently activates the channel
in the R&S NRP and tells the client at which ports channel services can be addressed. For this reason,
it is important that any firewalls or routers between the client and the R&S NRP enable free access from
the controller to the R&S NRP (core and abort channels) and vice versa (interrupt channel). As the
ports for the channels are dynamically assigned, reliable information regarding the port numbers used
cannot be provided.
Remote control via VXI11
The following possibilities are suggested for remote-controlling the R&S NRP via VXI11:
1. The simplest way to create remote-control programs is by using a VISA (virtual instruments
software architecture) implementation and creating the remote-control programs under Visual Basic
or C/C++. VISA implementations provide an application programming interface (API) that offers all
necessary functions. Knowledge about VXI11 is helpful but not required.
The VISA resource identifier used to identify a VXI11 device has the following format:
TCPIP::<IP address>::INSTR
The IP address is specified using the familiar dot notation (e.g. 89.10.65.59).
2. The "TCP/IP Instrument Protocol Specification VXI11" contains in annex C an RPCL description of
the protocol. The program rpcgen, which is contained in any ONC RPC distribution, is used to
generate stubs, which can be inserted into separate C programs, where the functions from the
following table can be called like ordinary library functions.
This procedure requires RPC programming skills.

Supplement R&S NRP
1144.1400.12-04- Supplement 4 E-1
VXI11 protocol functions
Function name Channel Meaning
create_link() core Opens a link to a network instrument device, setting up socket connections for the
core and abort channels, but not for the interrupt channel.
destroy_link() core Cancels a link to a network instrument device.
device_write() core Sends an IEEE 488.2 or SCPI command as a string to a network instrument device.
device_read() core Reads responses from a network instrument device.
device_readstb() core Reads the status byte of a network instrument device.
device_trigger() core Triggers a trigger in a network instrument device and is equivalent to *TRG.
device_clear() core Triggers a "device clear" (DCL) in a network instrument device. In the R&S NRP,
DCL and abort have the same effect. Because device_abort(), unlike
device_clear(), is transmitted over the abort channel, it is not serialized with
other commands but goes directly to the device and is therefore preferable.
device_remote() core Changes the network instrument device to the remote state.
device_local() core Changes the network instrument device to the local state.
device_lock() core LLO (local lock out). The keyboard of the network instrument device is locked.
device_unlock() core Cancels the LLO state.
device_docmd() core The network instrument device executes a command.
device_abort() abort The network instrument device aborts an in-progress command.
See device_clear().
create_intr_chan() core An interrupt channel to the network instrument device is set up.
destroy_intr_chan() core An existing interrupt channel to the network instrument device is cleared down.
device_enable_srq() core The sending of service requests from the network instrument device to the network
instrument controller is activated/deactivated.
device_intr_srq() interrupt This is the only function that the network instrument server calls from the network
instrument device. It signals a service request (SRQ).

R&S NRP Supplement
1144.1400.12-04- Supplement 5 E-1
USB
If the R&S NRP is connected to a controller via a USB 1.1 interface, it logs on as a USBTMC (USB test
and measurement class) device, provided that USB is selected as a remote interface in the
SystemÆRemote menu. The USBTMC standard describes how IEEE 488.2-compatible communication
with can be implemented via USB.
As with remote control via VXI11, the use of a VISA distribution that must include a USBTMC driver is
recommended for remote control via USB. The VISA resource identifier used to identify a USBTMC
device has the following format:
USB::<vendor ID>::<product ID>::<serial number>::INSTR
<vendor ID> 0x0aad
<product ID> 0x001b
<serial number> The serial number is a string that can be found in the SystemÆSystem Info menu.
In addition, the VISA resource identifier appears on the R&S NRP display if the USB remote interface is
selected.