Getting Started
Guide
Keys
ight N77xx Series
Notices
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CAUTION
CAUTION
A WARNING notice denotes a
hazard. It calls attention to an
operating procedure, practice,
or the like that, if not correctly
performed or adhered to, could
result in personal injury or
death. Do not proceed beyond a
WARNING notice until the
indicated conditions are fully
understood and met.
CAUTION
© Keysight Technologies, Inc. 2019
No part of this manual may be
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and retrieval or translation into a
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Keysight Technologies, Inc. as
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Manual Part Number
N7744-90A01
Edition
Edition 7.1, January 2019
Keysight Technologies,
Deutschland GmbH
Herrenberger Str. 130
71034 Böblingen, Germany
For Assistance and Support
http://www.keysight.com/find/assist
Limitation of Warranty
The foregoing warranty shall not
apply to defects resulting from
improper or inadequate maintenance
by Buyer, Buyer-supplied software or
interfacing, unauthorized modification
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product, or improper site preparation
or maintenance. No other warranty is
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Technologies specifically disclaims
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Merchantability and Fitness for a
Particular Purpose.
Warranty
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The hardware and/or software
described in this document are
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Restricted Rights Legend
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Software is delivered and licensed as
“Commercial computer software” as
defined in DFAR 252.227-7014 (June
1995), or as a “commercial item” as
defined in FAR 2.101(a) or as
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or any equivalent agency regulation
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disclosure of Software is subject to
Keysight Technologies’ standard
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greater than Restricted Rights as
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(June 1987). U.S. Government users
will receive no greater than Limited
Rights as defined in FAR 52.227-14
(June 1987) or DFAR 252.227-7015
(b)(2) (November 1995), as applicable
in any technical data.
Safety Notices
A
hazard. It calls attention to an
operating procedure, practice,
or the like that, if not correctly
performed or adhered to, could
result in damage to the product
or loss of important data. Do not
proceed beyond a
notice until the indicated
conditions are fully understood
and met.
WARNING
notice denotes a
Contents
1 Getting Started
Keysight N7744A and N7745A Optical Power Meter 7
Keysight N7747A and N7748A Optical Power Meter 8
Keysight N775xA Optical Attenuator and Power Meter and N776xA Optical
Attenuator 8
Keysight N7711/4A Single and 4-Port Tunable Laser System Source 9
Keysight N773x Optical Switch 10
Initial Inspection 11
Claims and Repackaging 11
Return Shipments to Keysight Technologies 12
Safety Considerations 13
Safety Considerations - Overview 13
Safety Symbols 13
General 14
Operating Environment 15
Line Power Requirements 15
Initial Safety Information for Tunable Laser Modules 15
Laser Safety Labels 16
Input/Output Signals 17
Line Power Connectors 17
Instrument Markings 18
AC Line Power Supply Requirements 19
AC Line Power Supply Requirements - Overview 19
Line Power Requirements 19
Line Power Cable 19
Changing the Fuse 21
Keysight N77xx Series 3
Operating and Storage Environment 21
Operating and Storage Environment - Overview 21
Temperature 21
Humidity 22
Altitude 22
Pollution Protection 22
Instrument Cooling 22
Input and Output Connectors 23
Input and Output Connectors - Overview 23
Front Panels - Multiport Power Meters 24
Front Panels - Optical Attenuators 25 Front
Panels - Tunable Laser Source 26 Front
Panels - Optical Switches 27
Rear Panel 27
Making Optical Connections 28
Making Optical Connections 28
Making Quad-adapter Connections on the Keysight N7744/45A Multiport
Power Meter 30
Optical Output 31
Electrical Connectors 32
LAN Interface 33
LAN Interface 33
Selecting a LAN Network 33
Private LAN Considerations 33
Security 33
Performance 34
Reliability 34
IP Address Availability 34 Site
LAN Considerations 34
Connecting the LAN Cable 35
GPIB Interface 37
GPIB Interface 37
Cables and Adapters 37
Connector 38
GPIB Logic Levels 38
USB Interface 39
Powering Up the Instrument 39
Powering Up the Instrument 39
Front Panel Indicators 40
4 Keysight N77xx Series
Index 53
Connecting to the Instrument 40
Connecting to the Instrument - Overview 40
Connecting over USB 40
Finding the IP Address of an instrument 42
Connecting over LAN 43
N77xx Viewer Common User Interface Functions 47
Software Installation 47
Connecting to an Instrument 47 Viewing
Measurements and Settings 50 Saving
and Recalling Configurations 51
Controlling the Instrument Refresh 52
Keysight N77xx Series 5
6 Keysight N77xx Series
Keysight N77xx Series
Getting Started Guide
1 Getting Started
Keysight N7744A and N7745A Optical Power Meter
The Keysight N7744A and Keysight N7745A are LXI compliant optical
power meters with 4 or 8 power-sensor ports respectively. They address
productivity challenges by increasing throughput and operational
efficiency using industry-leading device connectivity, high-speed
acquisition of measurement data and fast data transfer for postprocessing.
The Keysight N7744A and Keysight N7745A are designed to
characterize optical multiport components, such as multiplexers, PON
splitters, wavelength selective switches (WSS) and ROADMs, in all
product phases from R&D to manufacturing.
The one rack unit (1U half-rack high) instrument can be operated alone
or with other units, by PC connected over LAN, USB, or GPIB.
The unprecedented N7740A fiber connectivity concept consists of a
quadruple adapter (quad-adapter) with a quick-locking mechanism. Up
to four fiber connectors from the device under test (DUT) can be
connected in a comfortable working position to one quad-adapter. The
push-on locking mechanism makes it easy and secure to attach the quadadapter to and remove the quad-adapter from the instrument in
seconds. With multiple quad-adapters, the measurement task can be
fully separated from the DUT connection task. This means a further
increase in test throughput. Where this is not an issue, traditional single
connector connectivity is supported as well.
These power meters are highly compatible with setups and programs
developed using the Keysight 816x modular power meters. They are
also easy to synchronize with Keysight tunable laser sources, to make
spectral measurements. The functionality for time-dependent
measurement has been extended with sampling at up to 1 MHz and
data logging of up to 1 million samples for each port.
1 Getting Started
Keysight N7747A and N7748A Optical Power Meter
The two-port N7747A and 4-port N7748A optical power meters bring
the highest performance in terms of sensitivity, noise and relative
accuracy to the compact N77 instrument platform. These instruments
combine the optical performance of the 81634B sensor modules with
the large memory, fast data transfer and small footprint of the N77
series platform. Eight high-sensitivity optical power meters now fit in
a single rack unit. Optical connections are made with the
interchangeable 81000xI connector interface system.
Keysight N775xA Optical Attenuator and Power Meter and N776xA Optical Attenuator
The Keysight N775xA and N776xA are compact multichannel
attenuators
controlled fiber optic instruments. All attenuators feature power
control functionality to set the output power level of the attenuator.
and power meters. They are a new class of remote-
The Keysight N7751A and Keysight N7752A are optical attenuators for
single mode fiber with one and two single-mode fiber attenuator
channels respectively and two extra optical power meter channels, for
convenient power measurements and setup calibration. The Keysight
N7761A, Keysight N7762A and Keysight N7764A are single-mode fiber
optical attenuators for single mode fiber, with one, two and four
attenuator channels respectively.
All N775xA and N776xA attenuators address productivity challenges by
increasing throughput and operational efficiency.
The Keysight N7766A and the Keysight N7768A are optical attenuators
for multimode fibers with two or four attenuator channels repectively.
Both multimode
multimode fiber.
The N7766A and N7768A are 2 and 4 channel multimode fiber
attenuators that are optimized for quick power setting and preservation
of the input modal power distribution.
The attenuators are designed to attenuate and control the power of light
in optical fibers. They allow you to accurately and repeatably set the
attenuation factor or power level manually using the Viewer software,
or using the programming interface.
The attenuators include power control functionality that allow you to
set the output power level of the attenuator. When power control mode
is enabled, the module automatically corrects for power changes at the
input so that the output power level you set is maintained.
attenuators are available with 50µm and 62.5µm
8
Keysight
N77xx Series
Getting Started 1
Figure 1 Optical Attenuators with Power Control
The one rack unit (1U half-rack high) instrument can be operated alone
or with other units, controlled over LAN, USB, or GPIB.
These attenuators and power meters are fully compatible with setups
and programs developed using the Keysight 8157x modular
attenuators and basic 8163x optical power meter commands, not
including logging functionality.
Modal Fidelity for Multimode Fiber Systems
Signals in multimode fibers are distributed over a range of mode groups
that can have different loss and delay in a link. For dependable
multimode transceiver testing, the instrument used to set the power
level should not change this modal distribution. The bulk-optic filter and
collimated beam path of Keysight multimode attenuators are designed
to assure homogeneous attenuation of all input modes.
Keysight N7711/4A Single and 4-Port Tunable Laser System Source
The Keysight N7711A and N7714A tunable lasers are single-port and
four-port sources, available with C-band or L-band wavelength
coverage. The narrow linewidth and offset grid fine-tuning capability
of the N7711A and N7714A make them ideal sources for realistic
loading of the latest transmission systems.
To owners of Keysight proven Lightwave Measurement System the
81950A tunable laser source module offers the same features as the
N7711A. The 81950A plugs into the 8163B and 8164B mainframes. For
additional information about the 81950A please refer to the Compact
Tunable Laser data sheet, publication no. 5988-8518EN.
All models can reach any wavelength point within their specified
wavelength range just like all other Keysight tunable lasers. In this
mode,
Keysight N77xx Series 9
1 Getting Started
code compatibility with existing test setups based on Keysight's range
of full-size and compact tunable lasers is a great asset. In system
loading applications, it may be preferable to grid-tune the lasers like
system transmitters, simply by changing the channel index. The
channel grid is adjustable to standard ITU-T grid spacing like 50 GHz,
and to arbitrary grids. Likewise, the zero frequency (base channel) of
the chosen grid is adjustable. A 12 GHz fine-tuning range allows detuning the frequency.
Targeted for high test throughput, lowest cost-per-channel, and narrow
footprint, all members of Keysight's 77-Series optical test instruments
are built on a common platform and a common PC-based user
interface. A complete set of control interfaces including LAN, USB2.0
and GPIB simplifies integration with manufacturing control systems.
Code compatible to Keysight's Lightwave Measurement System
modules, the new instrument generation can serve as plug-in
replacements in existing test solutions. The N77 viewer software
allows to control all features of the N7711/4A tunable laser sources.
Keysight N773x Optical Switch
The Keysight N77-Series optical switches are available for both singlemode and multimode fiber test applications. The excellent repeatability,
compact format and flexible control interfacing support highperformance automated setups. The multimode switch has excellent
mode fidelity.
These instruments are used for automatic routing of optical signals for
testing devices like transceivers, amplifiers, and passive components.
Optical switches optimize the investment in automated test equipment
by improving repeatability and throughput and supporting parallel
measurements of multiport and multiple devices.
These switches can be used to avoid repeated reconnections during your
measurements and are critical to automated procedures. The excellent
switching repeatability assures that the signal level is constant from
cycle to cycle. The low IL and PDL and high repeatability assure
minimum impact of the switch on measurement accuracy. A typical
setup may use a 1x4 switch to select among several source wavelengths
in a test, while avoiding the time delay for power stabilization if each
source must be cycled on and off. Or the same digital signal may be
switch among several instruments, like a power meter, DCA or BERT.
In many cases, valuable signal source and analysis instrumentation can
be used more effectively in a parallel-test configuration. For example,
multiple cables or components can be tested together during
temperature cycling. On the other hand, an increasing use of inherently
parallel components, as for optical interconnections for 40G or 100G
using 10 Gb/s components, calls for identical testing in multiple paths.
10 Keysight
N77xx Series
Initial Inspection
Getting Started 1
These are well supported by the 1x13 switch configuration and the 13th
path can often be used as a permanent reference path.
Signals in multimode fibers are distributed over a range of mode groups
that can have different loss and delay in a link. For dependable
multimode transceiver testing, the instrument used to set the power
level should not change this modal distribution. The Keysight
multimode
between fiber, so signals propagate in practically the same distribution
as through uninterrupted multimode fiber.
Inspect the shipping container for damage. If there is damage to the
container or cushioning, keep them until you have checked the contents
of the shipment for completeness and verified the instrument both
mechanically and electrically. The Function Tests give a procedure for
checking the operation of the instrument. If the contents are incomplete,
mechanical damage or defect is apparent, or if an instrument does not
pass the operator’s checks, notify the nearest Keysight Technologies
Sales/Service Office.
switches are designed with very short collimated paths
N O T E
Claims and Repackaging
To avoid hazardous electrical shock, do not perform electrical tests when there are
signs of shipping damage to any portion of the outer enclosure (covers, panels, and
so on).
If physical damage is evident or if the instrument does not meet
specification when received, notify the carrier and the nearest
Keysight Technologies Sales/Service Office. The Keysight Technologies
Sales/Service Office will arrange for repair or replacement of the unit
without waiting for settlement of the claim against the carrier.
Keysight N77xx Series 11
1 Getting Started
Return Shipments to Keysight Technologies
If the instrument is to be shipped to an Keysight
Sales/Service Office, attach a tag showing owner, return address,
model number and full serial number and the type of service required.
The original shipping carton and packing material may be reusable, but
the Keysight Technologies Sales/Service Office will provide
information and recommendations on materials to be used if the
original packing is no longer available or reusable. General instructions
for repackaging are as follows:
Wrap instrument in heavy paper or plastic.
•
Use strong shipping container. A double wall carton made of 350-
•
pound test material is adequate.
Use enough shock absorbing material (3 to 4 inch layer) around all
•
sides of the instrument to provide a firm cushion and prevent
movement inside container. Protect control panel with cardboard.
Seal shipping container securely.
•
Mark shipping container FRAGILE to encourage careful handling.
•
In any correspondence, refer to instrument by model number and
•
serial number.
Technologies
Deleting user data
If you need to delete all your logged data and user configurations, that
is to reset the instrument completely:
Press and hold the Reset/standby button until the instrument starts
1
to reboot.
When the instrument reboots, press the Reset/standby button once
2
more briefly, to confirm you want to delete all the stored data.
12 Keysight
N77xx Series
Safety Considerations
Safety Considerations - Overview
Getting Started 1
The following generalsafety precautions must be observed during all
phases of operation, service, and repair of this instrument. Failure to
comply with these precautions or with specific warnings elsewhere in
this manual violates safety standards of design, manufacture, and
intended use of the instrument. Keysight Technologies Inc. assumes no
liability for the customer’s failure to comply with these requirements.
This product has been designed and tested in accordance with IEC
Publication 61010-1, Safety Requirements for Electrical Equipment for
Measurement, Control and Laboratory, and has been supplied in a safe
condition. The instruction documentation contains information and
warnings that must be followed by the user to ensure safe operation and
to maintain the product in a safe condition.
Safety Symbols
C A U T I O N
W A R N I N G
The caution sign denotes a hazard. It calls attention to a procedure which, if not
correctly performed or adhered to, could result in damage to or destruction of the
product. Do not proceed beyond a caution sign until the indicated conditions are
fully understood and met.
The warning sign denotes a hazard. It calls attention to a procedure which, if not
correctly performed or adhered to, could result in injury or loss of life. Do not
proceed beyond a warning sign until the indicated conditions are fully understood
and met.
The apparatus will be marked with this
symbol when it is necessary for the user
to refer to the instruction manual in order
to protect the apparatus against damage.
Keysight N77xx Series 13
1 Getting Started
Hazardous laser radiation.
Invisible laser radiation.
General
W A R N I N G
This is a Safety Class 1 instrument (provided with a protective earth
terminal) and has been manufactured and tested according to
international safety standards.
Before operation, you should review the instrument and manual for
safety markings and instructions. You must follow these to ensure safe
operation and to maintain the instrument in safe condition.
Some circuits are powered whenever the instrument is connected to the
AC power source. To disconnect from the line power, disconnect the
power cord either at the rear power inlet or at the AC line power source
(receptacle). One of these must always be accessible. If the instrument
is in a cabinet, it must be disconnected from the line power by the
system’s line power switch.
To avoid hazardous electrical shock, do not perform electrical tests when there
are signs of shipping damage to any portion of the outer enclosure (covers,
panels, and so on).
14 Keysight
N77xx Series
Operating Environment
Getting Started 1
W A R N I N G
The instrument is not designed for outdoor use. To prevent potential fire or shock
hazard, do not expose the instrument to rain or other excessive moisture.
Line Power Requirements
C A U T I O N
The instrument complies with installation category II and can operate from the
single-phase AC power source that supplies between 100 V and 240 V at a frequency
in the range 50/60 Hz. The maximum voltage fluctuation is 10% of the nominal
supply voltage. The maximum power consumption is 60 VA with all options installed.
Initial Safety Information for Tunable Laser Modules
The laser sources specified by this user guide are classified according
to IEC 60825-1 (2007).
The laser sources comply with 21 CFR 1040.10 except for deviations
pursuant to Laser Notice No. 50 dated 2007-June-24.
Table 2
Keysight N7711A,
N7714A
Options 210, 222, 240 Options 201, 222, 204
Laser Type ECL-Laser InGaAsP ECL-Laser InGaAsP
Wavelength range 1527nm-1566nm 1570nm-1609nm
Max. CW output power* 50 mW 50 mW
Beam waist diameter 9 µm 9 µm
Keysight N77xx Series 15
Keysight N7711A,
N7714A
1 Getting Started
Table 2
Numerical aperture 0.1 0.1
Laser Class according to
IEC 60825-1 (2007)
Max. permissible CW
output power**
* Max. CW output power is defined as the highest possible optical
power that the laser source can produce at its output connector.
** Max. permissible CW output power is the highest optical power that
is permitted within the appropriate laser class.
Laser Safety Labels
Keysight N7711A,
N7714A
Options 210, 222, 240
1 M 1 M
163 mW 163 mW
Keysight N7711A,
N7714A
Options 201, 222, 204
Laser class 1M label
Figure 2 Class 1M Safety Label - N7711/14A, N7721/22A
A sheet of laser safety labelsis included with the laser module as
required. In order to meet the requirements of IEC 60825-1 we
recommend that you stick the laser safety labels, in your language, onto
a suitable location on the outside of the instrument where they are
clearly visible to anyone using the instrument.
16 Keysight N77xx Series
Getting Started 1
W A R N I N G
Please pay attention to the following laser safety warning: Under no
circumstances look into the end of an optical cable attached to the optical output
when the device is operational. The laser radiation can seriously damage your
eyesight. Do not enable the laser when there is no fiber attached to the optical
output connector. The laser is enabled by pressing the ’active’ button close to
the optical output connector on the front panel of the module. The laser is on when
the green LED on the front panel of the instrument is lit. The use of optical
instruments with this product will increase eye hazard. The laser module has a
built-in safety circuitry which will disable the optical output in the case of a fault
condition Refer servicing only to qualified and authorized personnel.
Input/Output Signals
C A U T I O N
There is one input BNC connector: Trigger In. This is a TTL input.
A maximum of 5 V can be applied as an external voltage to this input connector.
There is one output BNC connector: Trigger Out. This is a TTL output. Do not apply
an external voltage to this connector.
The N7747A and N7748A have front-panel BNC connectors for each optical port.
This is an analog voltage output (0 to 2V). Do not apply an external voltage to this
connector.
Line Power Connectors
In accordance with international safety standards, the instrument has
a three-wire power cable. When connected to an appropriate AC power
receptacle, this cable earths the instrument cabinet. The type of power
cable shipped with each instrument depends on the country of
destination. Please refer to "Accessories" section in the User's Guide for
the part numbers of available power cables.
Keysight N77xx Series 17
1 Getting Started
W A R N I N G
To avoid the possibility of injury or death, you must observe the following
precautions before switching on the instrument.
Insert the power cable plug only into a socket outlet provided with a protective
•
earth contact. Do not negate this protective action by the using an extension
cord without a protective conductor.
Do not interrupt the protective earth connection intentionally.
•
Do not remove protective covers. Operating personnel must not remove
•
instrument covers. Component replacement and internal adjustments must
be made only by qualified service personnel.
Instruments that appear damaged or defective should be made inoperative
•
and secured against unintended operation until they can be repaired by
qualified service personnel.
Defective, damaged, or malfunctioning laser sources must be returned to an
•
Keysight Technologies Service Center.
Do not operate the instrument in the presence of flammable gases or fumes.
Operation of any electrical instrument in such an environment constitutes a
definite safety hazard.
Instrument Markings
The instruction manual symbol. The
product is marked with this warning
symbol when it is necessary for the user
to refer to the instructions in the manual.
The CE mark is a registered trademark of
the European Community.
The CSA mark is a registered trademark
of the Canadian Standards Association.
The C-Tick mark is a registered trademark
of the Australian Spectrum Management
Agency.
18 Keysight N77xx Series
AC Line Power Supply Requirements
AC Line Power Supply Requirements - Overview
Getting Started 1
The recycling symbol indicates the
general ease with which the instrument
can be recycled.
Do not dispose in domestic household
waste. To return unwanted products,
contact your local Keysight office, or
see for more information.
This secton provides information on:
Line Power Requirements
•
Line Power Cable
•
Changing the Fuse
•
Line Power Requirements
The instrument complies with installation category II and can operate
from the single-phase AC power source that supplies between 100 V and
240 V at a frequency in the range 50/60 Hz. The maximum voltage
fluctuation is 10% of the nominal supply voltage. The maximum power
consumption is 60 VA with all options installed.
Line Power Cable
In accordance with international safety standards, the instrument has
a three-wire power cable. When connected to an appropriate AC power
receptacle, this cable earths the instrument cabinet. For the part
number of the power cable for your country and instrument, see .
Keysight N77xx Series 19
1 Getting Started
C A U T I O N
Please note that the switch on the front panel of the instrument does not stop the
flow of power to the instrument.
If you need to turn off the power, unplug the instrument at the mains or remove the
power cable connector from the appliance coupler at the rear of the instrument. For
this reason, the power cable connection should be easily accessible - allowing you
to turn off the power quickly. If the instrument is in a cabinet, it must be disconnected
from the line power by the system’s line power switch.
The power switch allows you to switch between stand-by mode and
power-on mode.
Figure 3 Power Switch
W A R N I N G
When the instrument is in stand-by mode, the Pwr LED is orange. When
the instrument is powered-on, the Pwr LED is green.
To avoid the possibility of injury or death, you must observe the following
precautions before switching on the instrument.
Insert the power cable plug only into a socket outlet provided with a protective
•
earth contact. Do not negate this protective action by using an extension cord
without a protective conductor.
Do not interrupt the protective earth connection intentionally.
•
The AC power requirements are summarized on the rear panel of the
instrument.
20 Keysight N77xx Series
Figure 4 AC Power Requirement Markings
Changing the Fuse
Getting Started 1
C A U T I O N
There is no user replaceable fuse for the instrument. Changing the fuse should be
carried out only by Keysight Technologies service personnel. If you need to get
the fuse replaced refer to your nearest Keysight Technologies Sales/Service
Office.
Operating and Storage Environment
Operating and Storage Environment - Overview
The following summarizes the operating environment ranges. In order
for the instrument to meet specifications, the operating environment
must be within these limits.
W A R N I N G
The instrument is not designed for outdoor use. To prevent potential fire or shock
hazard, do not expose the instrument to rain or other excessive moisture.
Temperature
The instrument should be protected from temperature extremes and
changes in temperature that may cause condensation within it.
The operating temperature is from 5°C to +40°C (+10°C to +35°C for
laser sources).
The storage temperature is from -40°C to +70°C.
Keysight N77xx Series 21
1 Getting Started
Humidity
The operating humidity is 15 to 95%, non-condensing.
Altitude
The maximum operating altitude is 2000 m.
Pollution Protection
The instruments are designed for pollution degree 2.
Instrument Cooling
The instrument has a cooling fan mounted internally.
Mount or position your instrument upright and horizontally, as shown
in Figure 4 so that air can circulate through it freely.
Operating Position
When operating the instrument choose a location that provides at least
75 mm (3 inches) of clearance at the rear, and at least 25 mm (1 inch)
of clearance at each side. Failure to provide adequate air clearance may
result in excessive internal temperature, reducing instrument
reliability. The instrument should not be operated when resting on its
rear or side panels.
22
Keysight N77xx Series
Getting Started 1
Figure 5 Correct Operating Position
(shown here for the Keysight N7744/5A, valid also for the
N7747/48A,
and the N7711/4A)
N7751/2A, Keysight N7761/2/4A, N7766/68A, N773xA
Input and Output Connectors
Input and Output Connectors - Overview
This section provides information on:
•
•
•
•
•
Front Panels - Multiport Power Meters
Front Panels - Optical Attenuators
Front Panels - Tunable Laser Source
Front Panels - Optical Switches
Rear Panel
Keysight N77xx Series 23
1 Getting Started
Front Panels - Multiport Power Meters
Figure 6 Front panel of the Keysight N7744A 4-Channel Optical Multiport
Power Meter
Figure 7 Front panel of the Keysight N7745A 8-Channel Optical Multiport
Power Meter
Figure 8 Front panel of the Keysight N7747A 2-Channel Optical Power Meter
Figure 9 Front panel of the Keysight N7748A 4-Channel Optical Power Meter
24 Keysight N77xx Series
Front Panels - Optical Attenuators
Figure 10 Front panel of the Keysight N7751A 1-Channel Optical Attenuator
and
2-Channel Power Meter
Getting Started 1
Figure 11 Front panel of the Keysight N7752A 2-Channel Optical Attenuator
and
2-Channel Power Meter
Figure 12 Front panel of the Keysight N7761A 1-Channel Optical Attenuator
Figure 13 Front panel of the Keysight N7762A and N7766A 2-Channel
Optical Attenuator
Keysight N77xx Series 25
1 Getting Started
Figure 14 Front panel of the Keysight N7764A and N7768A 4-Channel
Optical Attenuator
Front Panels - Tunable Laser Source
Figure 15 Front panel of the Keysight N7711A Single-Port Tunable Laser
System Source
Figure 16 Front panel of the Keysight N7714A Single-Port Tunable Laser
System Source
26 Keysight N77xx Series
Front Panels - Optical Switches
Figure 17 Front panel of the Keysight N7731A 2-Channel 1x4 Optical Switch
Getting Started 1
Rear Panel
Figure 18 Front panel of the Keysight N7734A 1-Channel 1x13 Optical Switch
Figure 19 Rear panel of the Keysight N77xx Series instruments
Keysight N77xx Series 27
1 Getting Started
Making Optical Connections
Making Optical Connections
The optical attenuators are designed for use with FC connectors.
Attenuators ordered with option 021 have straight connector interfaces.
Attenuators ordered with option 022 have angled connector interfaces.
The option 009 single-mode fiber optical switches have angled FC/APC
connectors with narrow keying.
The tunable lasers are designed for use with FC connectors.
Lasers ordered with option 071 have straight connector interfaces.
Lasers ordered with option 072 have angled connector interfaces.
The N7751/2A power meter ports also use FC connectors but are noncontact. They can be used with both angled and straight connectors.
C A U T I O N
The N7766A and N7768A multimode attenuators have straight
connector interfaces. The fiber option determines the dimensions of the
internal fiber core, such as 50 or 62.5µm. Best performance is achieved
by matching this to the fibers used in the setup.
The option 062 multimode switches have straight FC/PC connector
interfaces. The dimensions of the internal fiber core is 62.5 µm. The
switches may also be used with good results together with 50 µm core
fiber because the fiber path is short.
If the connectors on your attenuator or lasers are angled, you can only use cables
with angled connectors with the instrument.
If the connectors on your attenuator are straight, you can only use cables with
straight connectors with the instrument.
Figure 20 Angled and Straight Connector Symbols
The above figure shows the symbols that tell you whether the optical
connectors of your instrument are angled or straight. The angled
contact connector symbol is colored green.
28 Keysight N77xx Series
Getting Started 1
You should connect straight contact fiber end connectors with neutral
sleeves to straight contact connectors, or connect angled contact fiber
end connectors with green sleeves to angled contact connectors.
N O T E
C A U T I O N
N O T E
You cannot connect angled non-contact fiber end connectors with orange sleeves
directly to the attenuator or laser.
The N774xA power meters do not make contact to the fiber connector
faces and can be used with either angled or straight connectors. The
N7744A and N7745A use the quad-adapters described below. The
N7747A and N7748A use the interchangeable 81000xI connector
interfaces, selected for the desire connector type. Common choices are
the 81000FI for FC connectors, 81000KI for SC connectors, and 81002LI
for LC connectors. The 81000BI can be used for bare fiber connections.
When using bare fiber connections to power meters, the length of fiber extending
from the fiber holder must be carefully adjusted to avoid scratching the power meter
optics.
Connector ferrules with conical or raised-end faces also add positioning uncertainty
and are not recommended for use with the N7747A or N7748A.
For further details on connector interfaces and accessories, refer to the
"Accessories" section in the User's Guide.
Keysight N77xx Series 29
1 Getting Started
Making Quad-adapter Connections on the Keysight N7744/45A Multiport Power Meter
N O T E
Figure 21 Connecting Optical Fibers
Before you attach a quad-adapter or fiber, you should make sure they are clean.
This is important for accurate measurements.
The fibers do not contact the optical inputs (all contact with the optical inputs should
be avoided). Usually the only cleaning necessary for the optical inputs is the gentle
removal of dust with pressurized, dry air.
For further information, refer to "Maintenance and Troubleshooting" section,
described in this manual.
To use a quad-adapter to connect optical fibers to the power meter
inputs:
Select the quad-adapter that suits the optical connector that your
1
optical fiber is terminated with.
Attach the optical connectors to the quad-adapter. You can attach
2
up to 4 fibers to the quad-adapter at the same time.
Make sure the number labels on the quad-adapter are at the top.
3
Connect the quad-adapter to the optical inputs by pressing it on until
4
it clicks securely into place without pressing the release levers.
30
Keysight N77xx Series
Getting Started 1
Removing Quad-adapter Interfaces from the Keysight
N7744/5A
Multiport Power Meter
N O T E
N O T E
There are release levers on both sides of the quad-adapter for removing it from the
optical inputs.
Figure 22 Removing Quad-adapter Interfaces
Press the release levers on both sides of the quad-adapter to release
1
it from the front panel of the power meter.
You can now remove the optical connectors from the quad-adapter.
2
Always place the dust cap on unused connector interfaces.
You can use the quad-adapter dust caps to protect the four power meter inputs and
the rear of the quad-adapter, for example, when fibers are attached.
Optical Output
Polarization Maintaining Fiber
A Polarization maintaining fiber (PMF) output is standard for Keysight
N7711/4A tunable laser system sources. PMF is aligned to maintain the
state of polarization. A well defined state of polarization helps ensure
constant measurement conditions. The fiber is of Panda type, with TE
mode in the slow axis in line with the connector key.
Keysight N77xx Series 31
1 Getting Started
Figure 23 Polarization maintaining fiber
Electrical Connectors
C A U T I O N
There are two BNC connectors on the rear panel of your instrument.
These are the Trigger Out and the Trigger In connectors.
The N7747A and N7748A have a front panel BNC connector for each
channel. These are for analog output signals and provide a voltage
proportional to the input signal power in mW. The voltage is in the range
0-2 V and 1 V corresponds to the value of the currently selected power
range. For example, when using the -10 dBm range, a 100 µW optical
power will give 1 V analog output.
The Trigger In is a TTL input. A maximum of 5 V can be applied as an external voltage
to this input connector.
The Trigger Output is a TTL output. Do not apply an external voltage to this
connector.
No external voltage should be applied to the analog output connectors of the
N7747A and N7748A.
32 Keysight N77xx Series
LAN Interface
LAN Interface
Selecting a LAN Network
Getting Started 1
This section explains the concept of LAN in details.
For the purposes of this guide, a private (isolated) LAN network is
defined as a network configuration in which instrument access is a
direct connection between the computer and the instrument, or to
multiple instruments connected via a dedicated router or switch. A site
(company-wide) LAN is defined as a network in which instrument
access is available to many users at on-site and remote locations. The
instrument’s application and/or your company’s IT (Information
Technology) department may have guidelines that help decide the type
of network (private or site) used. If a network configuration has not
been determined, refer to the following considerations concerning each
type.
Private LAN Considerations
Among the basic parameters of a private LAN network to consider are
security, performance, reliability, and IP address availability.
Security
A private network generally involves a direct connection between the
computer and the instrument, or to multiple instruments using switches
or routers. Access to the instrument is limited to users on the private
network, as opposed to users on a site network that could locate and
access the instrument from any location.
Private networks can reduce the possibility of tests being disrupted by
unplanned or unauthorized access. Code generation for test systems on
a private network is often simplified, as provisions against
unauthorized users may not be required.
Keysight N77xx Series 33
1 Getting Started
Performance
Test systems where large amounts of data are transferred usually have
faster throughput on a private network. On a site network, heavy and
unpredictable LAN traffic affects each instrument (node) on the
network. The impact on a test system is that repeatability is difficult to
achieve as latencies are difficult to account for.
Reliability
Private networks are fundamentally more reliable than site networks
as they host fewer users and are less complex than site networks.
Private networks are isolated from conditions that could bring down
(crash) a site network.
IP Address Availability
Every instrument (node) on a LAN (private or site) has an IP (Internet
Protocol) address. Due to the expanding use of the internet, the number
of site network IP addresses available is limited. By using a router with
Dynamic Host Configuration Protocol (DHCP) capability on a private
network, the router can assign an IP address to each instrument thus
creating a sub-network (subnet) that does not consume site IP
addresses.
Site LAN Considerations
For applications requiring access by many users or by users at
distributed sites, a site LAN network is required. In addition to
supporting multiple users, site LANs often offer the advantage of being
maintained by IT departments. When using a site LAN, consult your IT
department regarding LAN configuration and security issues.
34
Keysight N77xx Series
Connecting the LAN Cable
LAN cables are connected between the LAN terminal on the instrument
and the computer, or between the instrument and a router or switch if
included in your network.
Private Network Connections
The figure below shows typical LAN cable connections for a private
network.
Getting Started 1
Figure 24 Typical Private (isolated) LAN Network Connections
If the instrument is connected directly to the PC, use a LAN crossover
cable, as provided with the instrument. If your computer supports AutoMDIX or contains a LAN card with gigabit data transfer rates, the (blue)
crossover cable is not required. A standard LAN cable can be used
instead.
For private LAN networks that include a switch or router, use standard
LAN cables for all network connections. Do not use a crossover cable.
Site Network Connections
The following figure shows a typical LAN cable connection for a site
network.
Keysight N77xx Series 35
1 Getting Started
Figure 25 Typical Site LAN Network Connections.
On site networks, the instrument and the computer are connected
directly to site LAN ports, or are connected to the site LAN through a
switch. In each site network configuration, standard LAN cables are
used.
The LAN LED
As the LAN connection is made, the DHCP server assigns an address
and the LXI device identification proceeds you will see the following
indicators:,
Figure 26 The LAN LED
There may be a delay between making the LAN link (yellow status) and
getting the IP address (green status). This delay may be longer if there
is no DHCP server, for example when the instrument is connected
directly to a PC.
36 Keysight N77xx Series
GPIB Interface
Getting Started 1
The LAN Reset button
This recessed button has two functions.
Pressing the button briefly invokes a preset of the instrument and
•
restores default measurement settings. This is equivalent to the
programming command
:SYSTem:PRESet
Pressing and holding the button for 3 seconds will reset the LAN
•
parameters to the factory default. This includes changing the
password for modifying the configuration via LAN back to the
default "Keysight". This is equivalent to the following sequence of
programming commands:
:SYSTem:COMMunicate:ETHernet:RESet
GPIB Interface
You can connect your GPIB interface into a star network, a linear
network, or a combination star and linear network. The limitations
imposed on this network are as follows:
The total cable length cannot exceed 20 meters.
•
The maximum cable length between devices is 4 meters, with an
•
average separation of 2m between devices over the whole bus.
No more than 15 devices may be interconnected on one bus.
•
Cables and Adapters
For further details on cables and adapters, refer to "Cables" section in
the User's Guide.
Keysight N77xx Series 37
1 Getting Started
Connector
The following figure shows the connector and pin assignments.
Connector Part Number: 1251-0293
Figure 27 GPIB Connector
C A U T I O N
C A U T I O N
Keysight Technologies products delivered now are equipped with connectors
having ISO metric-threaded lock screws and stud mounts (ISO M3.5×0.6) that are
black in
English-threaded lock screws and stud mounts (6-32 UNC) that have a shiny
nickel finish.
It is recommended that you do not stack more than three connectors, one on top of
the other.
Hand-tighten the connector lock screws. Do not use a screwdriver.
GPIB Logic Levels
The instrument’s GPIB lines use standard TTL logic, as follows:
True = Low = digital ground or 0 Vdc to 0.4 Vdc
False = High = open or 2.5 Vdc to 5 Vdc
color. Earlier connectors may have lock screws and stud mounts with
All GPIB lines have LOW assertion states. High states are held at 3.0 Vdc
by pull-ups within the instrument. When a line functions as an input, it
requires approximately 3.2 mA to pull it low through a closure to digital
38 Keysight N77xx Series
Getting Started 1
ground. When a line functions as an output, it will sink up to 48 mA in
the low state and approximately 0.6 mA in the high state.
N O T E
The GPIB line screens are not isolated from ground.
USB Interface
N O T E
Before connecting the instrument over USB, install the Keysight I/O Libraries
Suite, which is included on a CD with the instrument.
The instrument is a USB device, with a mini-USB connector.
Powering Up the Instrument
Powering Up the Instrument
When you switch on the instrument, the LEDs on the front panel show
the various stages of booting.
Figure 28 Powering Up the Instrument
Keysight N77xx Series 39
1 Getting Started
Front Panel Indicators
During operation, you may notice the following LED indicators:
Figure 29 Front Panel Indicators
Connecting to the Instrument
Connecting to the Instrument - Overview
When you are first connecting the instrument, we recommend you use
the Keysight Connection Expert included with the Keysight I/O
libraries
www.Keysight.com).
Connecting over USB
N O T E
The screenshots show the Keysight N7745A Multiport Power Meter. The same
procedure applies when connecting an Keysight N7744/7/8A Multiport Power
Meter, an Keysight N7751/2A Optical Attenuator and Power Meter, or an
Keysight N7761/2/4/6/8A Optical Attenuator or an Keysight
Tunable Laser
(available on the CD supplied with the instrument, or from
N7711/4A
System Source or an N773x Optical Switch.
40 Keysight N77xx Series
Getting Started 1
If it is not already running, start the
1
software.
Figure 30 Keysight Connection Expert software
Attach the instrument to the USB. The first time you attach the
2
instrument, follow the instructions on the screen to select the driver
for this instrument.
When the instrument is connected, it is shown in the list.
Keysight Connection Expert
Figure 31 Select the instrument in the list
Select the instrument in the list to see the associated tasks (in the
3
Task Guide on the left) and information (on the right).
Keysight N77xx Series 41
1 Getting Started
Finding the IP Address of an instrument
Connect to the instrument over USB, as described above.
1
Select the instrument in the list.
2
Figure 32 Select the instrument
Click on “Send commands to this instrument”.
3
The default command is the *IDN? query.
Figure 33 *IDN? query
Enter the command
4
:SYSTem:COMMunicate:ETHernet:IPADdress:CURRent?
42 Keysight N77xx Series
Getting Started 1
then click on [Send & Read].
The instrument returns its current IP address.
Figure 34 :SYSTem:COMMunicate:ETHernet:IPADdress:CURRent?
Connecting over LAN
N O T E
The screenshots show the Keysight N7745A Multiport Power Meter. The same
procedure applies when connecting to other N77xx instruments like attenuators,
switches and laser sources.
Make sure the instrument is connected to the LAN, and that the LAN
1
LED on the front panel is green. See, “ LAN Interface” on page 33 for
more information to connecting over LAN.
If it is not already running, start the Keysight
2
software.
Select “LAN (TCPIP0)” in the list.
3
Connection Expert
Keysight N77xx Series 43
1 Getting Started
Figure 35
Click on “Add an instrument” in the Task Guide.
4
Wait for the scan to finish.
5
Select the instrument in the list.
6
Figure 36
To show the description of the instrument, check the box for *IDN?
7
query and click on "Find Again".
44 Keysight N77xx Series
Getting Started 1
Figure 37
Select the instrument in the list to see the associated tasks (in the
8
Task Guide on the left) and information (on the right).
For the N774x Multiport power meters, click on the “Instrument Web
•
Interface” button to control the instrument directly.
Keysight N77xx Series 45
1 Getting Started
Figure 38
If it is not already installed, you will need to install a Java run-time
engine to use this page.
Basic configuration and functionality are available from this web
page.
You can control any of the instruments from the Keysight
•
N77xx Viewer.
– Connecting and using the N77xx Viewer is described in
“Connecting to the Instrument - Overview” on page 40.
More advanced functionality is available through programming with
SCPI commands (described in the Programming Guide available on the
CD supplied with the instrument or from www.Keysight.com), or using
the 816x VXI Plug&Play driver, version 4.4 or higher. You can also use
the IVI-COM driver for the N7744A and N7745A Multiport power
meters.
46 Keysight N77xx Series
N77xx Viewer Common User Interface Functions
Software Installation
The N77xx Viewer is a small user interface program that can be installed
on a computer with Windows operating system. The installation
package is distributed on the instrument CD and is available on the
internet via the Package Manager at www.
Using the Viewer also requires a VISA package to be installed, usually
with the Keysight IO Library Suite.
Connecting to an Instrument
Getting Started 1
Keysight.com/find/n7700.
When you first launch the N77xx Viewer, it is not connected to any of
your instruments.
Click on the “Connect” icon at the top right of the window.
1
Select the instrument to which you want to connect from the list.
2
Keysight N77xx Series 47
1 Getting Started
Figure 39 Connecting to an Instrument
The list shows instruments that have been given a VISA address.
3
If your instrument is not in the list,
Use the
1
a VISA address
Click on the “Scan Again” button.
2
Once communication has been established to the instrument, its
details are shown.
If you need to change the connection configuration for an instrument
4
on the LAN, click on the “Configure Interfaces” button.
You can only configure the LAN parameters before the instrument
is connected.
Keysight Connection Expert to check your instrument has
48 Keysight N77xx Series
Getting Started 1
Figure 40 Interface Parameters
– Make sure both DHCP and Auto IP are not selected.
– You can now edit the IP parameters.
For instruments you use regularly, you can add a link on your
5
desktop by putting a check mark in the box to “Place a shortcut on
the Desktop”.
Click on the “OK” button to finish the connection.
6
Keysight N77xx Series 49
1 Getting Started
Viewing Measurements and Settings
The settings and readings of the instrument can be accessed directly
from the main Viewer panel. Instruments with multiple channels have
a tab for each channel. In addition, separate windows can be opened for
simply viewing the settings and readings, as follows:
Viewing the measurement on a single channel
Click on the “New” button to open a window with the current
1
measurement and parameter settings.
50
Figure 41 Viewing the measurement on a single channel attenuator/power
meter (left) or tunable laser (right)
Viewing all channels
Click on "Overview" to open a window with the measurements on all
1
channels.
Keysight N77xx Series
Figure 42 Viewing all channels
Saving and Recalling Configurations
Getting Started 1
Saving a configuration
You can save the current measurement configuration to either of two
settings stored on the instrument.
In the File menu, select Save.
1
Enter or select the setting to which you want to save it.
2
Figure 43 Saving a configuration
Click on the “OK” button.
3
Recalling a configuration
In the File menu, select Load.
1
Enter or select the setting you want to retrieve.
2
Keysight N77xx Series 51
1 Getting Started
Click on the “OK” button.
3
Controlling the Instrument Refresh
In the File menu, select Update.
1
In the dialog, you can :
Figure 44 Controlling the Instrument Refresh
Stop and start the display of all changes. Make sure to put a check
•
in the box for “Update enabled”, to enable the N77xx Viewer to
display the status and results from the instrument. If there is no
check in the box for “Update enabled”, the display is not updated
with the replies to queries sent to the instrument.
Set the update interval for “Readings” to control how often the
•
result is read from the instrument and the display updated.
Set the update interval for “Polled Values” to control how often
•
the measurement parameters are read from the instrument and
the display updated. This is useful if, for example, more than one
person can control the instrument.
When you have set all the values, click on the “OK” button.
2
52 Keysight N77xx Series
Index
A
Adapters, 37
Keysight N77-Series optical switch,
10
Keysight N7745A, 7
Keysight N7751A,
Keysight N7752A, 8
Keysight N7766A, 8
Keysight N7768A, 8
Angled contact connector, 28
8
B
BNC connectors, 32
C
Cables, 37
Compact multichannel attenuators, 8
Compact Tunable Laser, 9
Connect angled contact fiber end
connectors, 29
Connector, 38
Controlling the Instrument Refresh,
52
E
Electrical Connectors, 32
Front Panels - Optical Attenuators,
25
Front Panels - Optical Switches, 27
Front Panels - Tunable Laser Source,
26
G
GPIB interface, 37
GPIB Logic Levels, 38
I
Input/Output Signals, 17
Instrument Markings, 18
IP address, 33
L
Laser class 1M label, 16
laser safety labels, 16
Line Power Cable, 19
Line Power Connectors, 17
Line Power Requirements, 15
M
Multimode attenuators, 28
N
O
Operating Environment, 15
Optical connectors, 28
Optical attenuators, 28
P
Power Meters, 8
R
Rear Panel, 27
Recalling a configuration, 51
S
Safety, 13
Safety Considerations, 13
Safety Information for Tunable Laser
Modules, 15
Safety Symbols, 13
Saving a configuration, 51
Software Installation, 47
Straight contact connectors, 29
T
Temperature for operation and
storage, 21
F
Front Panel Indicators, 40
Front Panels - Multiport Power
Meters, 24
Keysight N77xx Series 53
N7747A, 8
N7748A, 8
U
USB Interface, 39
Index
V
Viewing Measurements and Settings,
50
54
Keysight N77xx Series
www.keysight.com
This information is subject to change without notice.
© Keysight Technologies 2019
Edition 7.1, January 2019
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