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Keysight N7744A, User Manual

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Keysight N7744A User Manual Download Page 100

DRAM

 

128 MB volatile working memory. This contains data for 

current and recent calibrating and measuring.

Clearing User Data

Clearing the DRAM

All data in the DRAM is cleared by powering the instrument off.

Clearing the Flash ROM

The user data can be cleared from the Flash ROM by:

1

Reset the instrument to factory default.

a

Send the command:

SYSTem:PRESet

OR

b

Press the LAN Reset button on the front panel briefly (<1 s).

2

Clear the instrument log.

a

Send the special command

DIAG:SYST:FLAS:LOGF:ERAS

The contents of the log can be checked with the query READ:LOGF?.

3

Clear the Ethernet settings

a

Connect to the instrument by some means other than the LAN,
using VISA Assistant (for example over USB). Send the command:

SYSTem:COMMunicate:ETHernet:RESet

OR

b

With the instrument connected over the LAN (the LAN LED is
green), press and hold the LAN Reset button for more than 3s.

In either case, the instrument reboots.

Maintenance and Troubleshooting 

6

Keysight N774x Series 

99

Summary of Contents for N7744A

Page 1: ... N774x Series N7744A 4 Channel Optical Multiport Power Meter LXI N7745A 8 Channel Optical Multiport Power Meter LXI N7747A 2 Channel High Sensitivity Optical Power Meter N7748A 4 Channel High Sensitivity Optical Power Meter ...

Page 2: ......

Page 3: ...GHT AND THE USER HAVE A SEPARATE WRITTEN AGREEMENT WITH WARRANTY TERMS COVERING THE MATERIAL IN THIS DOCUMENT THAT CONFLICT WITH THESE TERMS THE WARRANTY TERMS IN THE SEPARATE AGREEMENT SHALL CONTROL Technology Licenses The hardware and or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license Restricted Rights ...

Page 4: ...12 Line Power Connectors 12 Instrument Markings 13 AC Line Power Supply Requirements 13 AC Line Power Supply Requirements Overview 13 Line Power Requirements 14 Line Power Cable 14 Changing the Fuse 15 Operating and Storage Environment 16 Operating and Storage Environment Overview 16 Temperature 16 Humidity 16 Altitude 16 Pollution Protection 16 Instrument Cooling 17 Input and Output Connectors 18...

Page 5: ... 28 GPIB Logic Levels 28 USB Interface 29 Powering Up the Instrument 29 Powering Up the Instrument 29 Front Panel Indicators 30 Connecting to the Instrument 30 Connecting to the Instrument Overview 30 Connecting over USB 30 Finding the IP Address of an instrument 32 Connecting over LAN 33 Claims and Repackaging 37 Claims and Repackaging Overview 37 Return Shipments to Keysight Technologies 37 N77x...

Page 6: ...Max Mode 55 How to Use External Triggers 56 3 Power Meter Applications Power Meter Applications 59 The Logging Application 59 Continuous Logging Using Data Buffers 60 The Stability Application 61 4 Specifications and Regulations Compliance Definition of Terms 63 Literature 71 Technical Specifications Keysight N7744A and N7745A 72 Technical Specifications Keysight N7747A and N7748A 74 Declaration o...

Page 7: ...85 Cleaning Instructions for this Instrument 86 Safety Precautions 86 Why is it important to clean optical devices 86 What do I need for proper cleaning 87 Preserving Connectors 92 Cleaning Instrument Housings 92 Which Cleaning Procedure should I use 93 How to clean connectors 93 How to clean connector adapters 95 How to clean bare fiber adapters 95 How to clean optical glass plates 96 Additional ...

Page 8: ... 9 AC Line Power Supply Requirements Overview on page 13 Operating and Storage Environment Overview on page 16 Input and Output Connectors Overview on page 18 Making Optical Connections on page 20 Electrical Connectors on page 22 LAN Interface on page 23 GPIB Interface on page 27 USB Interface on page 29 Powering Up the Instrument on page 29 Connecting to the Instrument Overview on page 30 Claims ...

Page 9: ...er 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 ...

Page 10: ...nd so on Safety Considerations Safety Considerations Overview 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 ...

Page 11: ...uct Do not proceed beyond a caution sign until the indicated conditions are fully understood and met W A R N I N G 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 proceedbeyondawarningsignuntiltheindicatedconditionsarefullyunderstood and met 1 Getting Started 10 Keysight N774x Series ...

Page 12: ... in a cabinet it must be disconnected from the line power by the system s line power switch W A R N I N G 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 Operating Environment W A R N I N G The instrument is not designed for outdoor use To prevent potential fire or shock hazard...

Page 13: ...ables 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 Insertthepowercableplugonlyintoasocketoutletprovidedwithaprotective 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 ...

Page 14: ...usehold waste To return unwanted products contact your local Keysight office or see http about keysight com en companyinfo environment takeback shtml for more information AC Line Power Supply Requirements AC Line Power Supply Requirements Overview This secton provides information on Line Power Requirements Line Power Cable Getting Started 1 Keysight N774x Series 13 The CE mark is the conformity ma...

Page 15: ... cabinet For the part number of the power cable for your country and instrument see Accessories Overview on page 81 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 inst...

Page 16: ...ve 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 Figure 2 AC Power Requirement Markings Changing the Fuse 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 Technologie...

Page 17: ...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 The storage temperature is from 40 C to 70 C Humidity The operating humidity is 15 to 95 non condensing Altitude The maximum operating alt...

Page 18: ... 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 Figure 3 Correct Operating Position shown here for the Keysight N7744 5A valid also for the N7747 48A N7751 2A Keysi...

Page 19: ...n on Front Panels Multiport Power Meters Rear Panel Front Panels Multiport Power Meters Figure 4 Front panel of the Keysight N7744A 4 Channel Optical Multiport Power Meter Figure 5 Front panel of the Keysight N7745A 8 Channel Optical Multiport Power Meter 1 Getting Started 18 Keysight N774x Series ...

Page 20: ...ysight N7747A 2 Channel Optical Power Meter Figure 7 Front panel of the Keysight N7748A 4 Channel Optical Power Meter Rear Panel Figure 8 Rear panel of the Keysight N77xx Series instruments Getting Started 1 Keysight N774x Series 19 ...

Page 21: ...onnectors 81000KI for SC connectors and 81002LI for LC connectors The 81000BI can be used for bare fiber connections C A U T I O N 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 N O T E Connectorferruleswithconicalorraised endfacesalsoaddpositioninguncertainty and are not re...

Page 22: ...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 1 Select the quad adapter that suits the optical connector that your optical fiber is terminated with 2 Attach the optical connectors to the quad adapter You can attach up to 4 fibers to the quad adapter at the same time 3 M...

Page 23: ...he quad adapter dust caps to protect the four power meter inputs and the rear of the quad adapter for example when fibers are attached Electrical Connectors 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...

Page 24: ... 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 o...

Page 25: ...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 br...

Page 26: ...ment 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 Figure 11 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 Auto MDIX or contains a LAN card with gigabit da...

Page 27: ... 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 13 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 l...

Page 28: ...default Keysight This is equivalent to the following sequence of programming commands SYSTem COMMunicate ETHernet RESet GPIB Interface 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 d...

Page 29: ...C that have a shiny nickel finish C A U T I O N 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 All GPIB lines have LOW assertion sta...

Page 30: ...ore 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 15 Powering Up the Instrument Getting Started 1 Keysight N7...

Page 31: ... CD supplied with the instrument or from 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 N7711 4A Tunable Laser System Source or an ...

Page 32: ...instructions on the screen to select the driver for this instrument When the instrument is connected it is shown in the list Figure 18 Select the instrument in the list 3 Select the instrument in the list to see the associated tasks in the Task Guide on the left and information on the right Getting Started 1 Keysight N774x Series 31 ...

Page 33: ...bed above 2 Select the instrument in the list Figure 19 Select the instrument 3 Click on Send commands to this instrument The default command is the IDN query Figure 20 IDN query 4 Enter the command SYSTem COMMunicate ETHernet IPADdress CURRent 1 Getting Started 32 Keysight N774x Series ...

Page 34: ...rocedure applies when connecting to other N77xx instruments like attenuators switches and laser sources 1 Make sure the instrument is connected to the LAN and that the LAN LED on the front panel is green See LAN Interface on page 23 for more information to connecting over LAN 2 If it is not already running start the Keysight Connection Expert software 3 Select LAN TCPIP0 in the list Getting Starte...

Page 35: ...ent in the Task Guide 5 Wait for the scan to finish 6 Select the instrument in the list Figure 23 7 To show the description of the instrument check the box for IDN query and click on Find Again 1 Getting Started 34 Keysight N774x Series ...

Page 36: ... to see the associated tasks in the 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 Getting Started 1 Keysight N774x Series 35 ...

Page 37: ...ing the N77xx Viewer is described in Connecting to the Instrument Overview on page 30 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 2 or higher You can also use the IVI COM driver for the N7744A and N7745A ...

Page 38: ...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 ...

Page 39: ...te all the stored data N77xx Viewer Common User Interface Functions Connecting to an Instrument When you first launch the N77xx Viewer it is not connected to any of your instruments 1 Click on the Connect icon at the top right of the window 2 Select the instrument to which you want to connect from the list Figure 26 Connecting to an Instrument 1 Getting Started 38 Keysight N774x Series ...

Page 40: ...2 Click on the Scan Again button Once communication has been established to the instrument its details are shown 4 If you need to change the connection configuration for an instrument on the LAN click on the Configure Interfaces button You can only configure the LAN parameters before the instrument is connected Figure 27 Interface Parameters Getting Started 1 Keysight N774x Series 39 ...

Page 41: ... 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 1 Click on the New button to open a window with the current measurement and parameter settings Figure 28 Viewing t...

Page 42: ...Recalling Configurations Saving a configuration You can save the current measurement configuration to either of two settings stored on the instrument 1 In the File menu select Save 2 Enter or select the setting to which you want to save it Figure 30 Saving a configuration 3 Click on the OK button Getting Started 1 Keysight N774x Series 41 ...

Page 43: ...tatus 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 inst...

Page 44: ...mands 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 For the Keysight N7744A N7745A Optical Multiport Power Meter you can also use the associated IVI COM drivers To connect to the instrument see Input and Output Connectors Overview on page 18 To display the Web Interface of the Multiport Power Mete...

Page 45: ...Figure 32 The Welcome Page Select the Browser Web Control tab on the left Figure 33 The Browser Web Control 2 Power Measurement 44 Keysight N774x Series ...

Page 46: ...es are made when you press the Apply button If you selected the All checkbox the setting is applied to all ports To quickly and reproducibly set the measurement parameters use the Measurement Settings buffers These let you save and recall sets of settings with single programming commands For further details refer to Handling Measurement Settings The CONFigure MEASurement SETTing subtree in the Pro...

Page 47: ...ort Power Meters is using the N77xx Viewer which is a control and display graphical user interface Figure 35 The N77xx Viewer The Viewer is available to download from the product webpage which you can access at 2 Power Measurement 46 Keysight N774x Series ...

Page 48: ... update file VXI Plug Play Drivers IVI Drivers How to Measure Power The Power Value For each port the optical power is measured and returned or displayed The power reading represents the average optical power over the selected averaging time The power meter can continuously self trigger new measurements or be configured to wait for external software or hardware triggers Power Measurement 2 Keysigh...

Page 49: ...W are the SI unit for power measurement You can also measure power in dB or dBm Values returned in these units are derived from measurement in Watts By selecting dBm the following calculation is made Where PdBm is the power value returned in dBm and Pinput is the input signal level in Watts Power in units of dBm is measured relative to 1 mW It is an absolute power measurement Power in units of dB ...

Page 50: ...and CAL is the calibration offset in decibels dB How to Set the Reference Level How to Input a Reference Level dB results are shown relative to a reference level Setting or changing the reference only affects results that are returned in dB You can set the reference level in units of dBm or Watts Depending on which is selected the following equations are used to calculate the power level in dB PdB...

Page 51: ...er Power Measurement Port You can use the reference mode to reference to another port s current power level If you choose this mode the reference of the port continuously updates to the current power value measured by the other port The following equations describe how the power in dB is calculated if you reference another port PdB PmeasuredA dBm PmeasuredB dBm REF dB or where PdB is the relative ...

Page 52: ... at low optical power levels Performing a zero sets the zero power level to the average electrical offset level for the current environmental conditions N O T E The environmental conditions and the temperature of the instrument NOTE affect electrical offset For the best results you must Allow the instrument time to acclimatize around 24 hours Allow the instrument time to warm up around 20 minutes ...

Page 53: ...il is if a source is connected to the Power Meter s input connector the fiber connected to the Power Meter s input connector is collecting light or the Power Meter receives ambient light because the input connector is uncovered When zeroing is finished the traffic light is green You can now proceed with your measurements When environmental conditions are stable the zero setting will remain valid o...

Page 54: ...determined range If the measured power is more than 3dB greater than the range setting the power cannot be measured and an overflow is indicated by the returned power value This means that the measured power is greater than the Upper Power Limit You must increase the Range value More more details see the following table Upper Power Limit The following table shows the upper power limit at the avail...

Page 55: ... These bandwidths are reduced in steps when longer averaging times are used to improve the noise performance while maintaining signal fidelity For the N7747A and N7748A the averaging time can be set from 25 µs to 10 s Up to 2 ms the setting can be varied with a typical resolution of 2 µs and for higher averaging times the setting resolution is about 0 1 The bandwidth is fixed with the chosen power...

Page 56: ...the Web Control Interface and the N77xx Viewer as well as with direct programming described in the Programming Guide You can choose two modes of operation from the MinMax mode menu Continuous mode which compares each new measured value with the maximum and minimum values so far and replaces them as necessary This mode is useful for measuring the Polarization Dependent Loss PDL of a component Run t...

Page 57: ... minimum sampling period in Min Max mode dependent on the rate of commands and number of active ports is about 2 ms How to Use External Triggers The Optical Multiport Power Meter lets you trigger the instrument to perform tasks and to output trigger signals to external measurement instruments using the rear panel BNC connectors 1 In the File menu select Trigger 2 Power Measurement 56 Keysight N774...

Page 58: ...nnectors Pass Through if you want an input trigger to automatically generate an output trigger This lets you trigger another instrument almost simultaneously 3 Set the input trigger functions The power meter ports can be configured individually to respond to an input trigger by Ignore The trigger is ignored Single Measurement The trigger causes a single power measurement to be made Complete Measur...

Page 59: ... Meas started An output trigger is generated when a power measurement begins Avg Time Over An inverted trigger is generated for each measurement sample For further information on triggering please refer to the Keysight N77xx Series Programming Guide in the chapter Triggering The TRIGger Subsystem 2 Power Measurement 58 Keysight N774x Series ...

Page 60: ...e Stability application differs from the Logging application because the period time the time it takes from the start of one measurement period until another measurement period starts may be greater than or equal to the averaging time These applications can be accessed with programming commands as described in the Programming Guide The Logging Application on page 59 The Stability Application on pa...

Page 61: ...7A and N7748A allow different settings for logging parameters on each channel The logging function is often used together with single measurement input triggering for synchronized measurement with another instrument especially for spectral measurements with a tunable laser Continuous Logging Using Data Buffers Enhanced logging functionality is available using two data buffers for each port The MPP...

Page 62: ... Stability Application The Stability Application logs a series of power measurements for a number of power meter ports Figure 42 Example Stability Application The Stability application differs from the The Logging Application because you set the averaging time the total time and the period time after which each new measurement is started Period time must be greater than or equal to the averaging t...

Page 63: ...the last dwell time period not after the last averaging time period The Stability application enables you to make periodic power measurements over a long time 277 hours 11 days and 13 hours 3 Power Meter Applications 62 Keysight N774x Series ...

Page 64: ...udes constant values of temperature humidity wavelength input power level polarization state and mode distribution if the quantity is not explicitly subject to variation Data logging capability Maximum number of power readings per port that can be captured during a logging operation Drift dark Specifies the maximum deviation from zero of the measured power with no optical input dark over time excl...

Page 65: ...power meter range value that is in the 0 dBm power meter range Pmax is 3 dBm except for the 10 dBm range with Pmax 10 dBm Pmin dBm is calculated as the root sum square RSS of the specified Noise 2 sigma dark see Noise 2 sigma dark on page 66 and Drift dark see Drift dark on page 63 RSS is calculated in linear units Watts Frequency Response Specifies the frequency fresp up to which the power meter ...

Page 66: ...ower meter or attenuator without permanent change to its characteristics Attention Applying more than the specified power might damage the power meter or attenuator N O T E For input powers 20 dBm clean connectors in good condition are vital to avoid thermally induced fiber damage Minimum averaging time The minimum selectable averaging time Noise pp dark Specifies the peak to peak pp change of dis...

Page 67: ...oise N is calculated by N 2 StDevi Pi Fi where StDevi denotes the standard deviation over indices i Operating humidity Humidity range where the instrument is designed to be operated The instrument must not be operated outside this range If previously stored beyond this range wait for acclimation before turning on the instrument Operating temperature Temperature range for which the specifications a...

Page 68: ... power D on any other port with no applied power dark Excluding Noise pp dark see Noise pp dark on page 65 and Drift dark see Drift dark on page 63 Powers expressed in dBm port separation S expressed in dB S P D Figure 44 Port separation static Conditions Applied power level as specified Port separation dynamic Specifies the difference between step power input Pstep with positive or negative slope...

Page 69: ...settling time specifies the time required for the power meter to settle into the new range Measurements starting after that period are within specifications The time starts when the instrument receives the range change command manual range or when the instrument detects the requirement for power meter range change autorange Conditions As specified Relative port to port uncertainty Specifies half t...

Page 70: ...ange The wavelength range for which all specifications and characteristics apply if not differently stated Spectral ripple power meter due to interference A coherent input signal causes optical interference1 between reflective interfaces within the power meter s optical assembly including the end face of a connected fiber Optical interference causes a wavelength dependent periodic change of the po...

Page 71: ...Powers expressed in Watts Excluding Noise pp dark see Noise pp dark on page 65 and Drift dark see Drift dark on page 63 U 100 M P 1 Conditions Operating conditions as specified Other conditions as specified Uncertainty at reference conditions The maximum relative difference U between measured displayed power M and actual true power P for the specified set of reference conditions including all unce...

Page 72: ...trument after which the specifications and characteristics apply Literature Fiber Optic Test and Measurement Hewlett Packard Professional Books edited by Prentice Hall ISBN 0 13 534330 5 Specifications and Regulations Compliance 4 Keysight N774x Series 71 ...

Page 73: ...Technical Specifications Keysight N7744A and N7745A 4 Specifications and Regulations Compliance 72 Keysight N774x Series ...

Page 74: ...Specifications and Regulations Compliance 4 Keysight N774x Series 73 ...

Page 75: ...Technical Specifications Keysight N7747A and N7748A 4 Specifications and Regulations Compliance 74 Keysight N774x Series ...

Page 76: ...General Characteristics Specifications and Regulations Compliance 4 Keysight N774x Series 75 ...

Page 77: ...f Conformity Keysight N7744A and N7745A 4 Specifications and Regulations Compliance 76 Keysight N774x Series The latest version of the Declaration of Conformity can be found here http www keysight com go conformity ...

Page 78: ...f Conformity Keysight N7747A and N7748A Specifications and Regulations Compliance 4 Keysight N774x Series 77 The latest version of the Declaration of Conformity can be found here http www keysight com go conformity ...

Page 79: ... Inc certifies that this product met its published specifications at the time of shipment from the factory Keysight Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology NIST to the extent allowed by the Institutes s calibration facility and to the calibration facilities of other International Standards Or...

Page 80: ... Keysight offers a wide range of additional expert test and measurement services for your equipment including initial start up assistance onsite education and training as well as design system integration and project management For more information on repair and calibration services go to www keysight com find removealldoubt Keysight E mail Updates Get the latest information on the products and ap...

Page 81: ...bined to more easily integrate test system development www keysight com find open LXI LXI is the LAN based successor to GPIB providing faster more efficient connectivity Keysight is a founding member of the LXI consortium www lxistandard org www keysight com For more information on Keysight Technologies products applications and services please contact your local Keysight office The complete list ...

Page 82: ...and accessories Instrument and Options Keysight N7744A and N7745A Table 4 N7744A N7745A ordering options N7744A Optical Multiport Power Meter 4 channel N7748A Optical Multiport Power Meter 8 channel includes USB and cross over LAN cable Accessories N7740FI FC Connector Adapter for Optical Multiport Power Meter N7740KI SC Connector Adapter for Optical Multiport Power Meter Keysight N774x Series Use...

Page 83: ...ultiport Power Meter 81004BM Bare Fibre Holder Set for 0 400 µm Fibres 4 each with gauge 81009BM Bare Fibre Holder Set for 400 900 µm Fibres 4 each with gauge N7744A 100 Rack Mount Kit for one or two Multiport Power Meter Units N O T E N7744A 100 does not mount two units of different depth Service and Repair R 50C 011 3 Keysight calibration up front support plan 3 year coverage R 50C 011 5 Keysigh...

Page 84: ...r LAN cable Accessories 81000FI FC Connector Interface 81000KI SC Connector Interface 81000PI E 2000 Connector Interface sensor only 81000SI DIN 47256 4108 Connector Interface 81000VI ST Connector Interface 81002LI LC Connector Interface 81002MI MU Connector Interface 81000BI Bare Fiber Interface Kit N7744A 100 Rack Mount Kit for one or two Optical High Performance Power Meter Units Accessories 5 ...

Page 85: ...N7745A power meters with corresponding adapters is recommended for highest accuracy Ferrules with conical or raised end faces also add positioning uncertainty and are not recommended for use with the N7747A or N7748A Service and Repair R 50C 011 3 Keysight calibration up front support plan 3 year coverage R 50C 011 5 Keysight calibration up front support plan 5 year coverage Cables GPIB Cable 1083...

Page 86: ...phases of cleaning Consult your specific optical device manuals or guides for full information on safety matters Please try whenever possible to use physically contacting connectors and dry connections Clean the connectors interfaces and bushings carefully after use If you are unsure of the correct cleaning procedure for your optical device we recommend that you first try cleaning a dummy or test ...

Page 87: ...ances look into the end of an optical device attached to optical outputs when the device is operational The laser radiation is not visible to the human eye but it can seriously damage your eyesight To prevent electrical shock disconnect the instrument from the mains before cleaning Use a dry cloth or one slightly dampened with water to clean the external case parts Do not attempt to clean internal...

Page 88: ...leaning your instrument For certain cleaning procedures you may also require certain Additional Cleaning Equipment Standard Cleaning Equipment Before you can start your cleaning procedure you need the following standard equipment Dust and shutter caps Isopropyl alcohol Cotton swabs Soft tissues Pipe cleaner Compressed air Dust and shutter caps All of Keysight Technologies lightwave instruments are...

Page 89: ...optic connectors To avoid damage only use isopropyl alcohol Cotton swabs We recommend that you use swabs such as Q tips or other cotton swabs normally available from local distributors of medical and hygiene products for example a supermarket or a chemist s shop You may be able to obtain various sizes of swab If this is the case select the smallest size for your smallest devices Ensure that you us...

Page 90: ...and out of the device opening for example when cleaning an interface While you are cleaning you should slowly rotate the pipe cleaner Only use pipe cleaners on connector interfaces or on feed through adapters Do not use them on optical head adapters as the center of a pipe cleaner is hard metal and can damage the bottom of the adapter Your pipe cleaner should be new when you use it If it has colle...

Page 91: ...lly the light source on your microscope should be very flexible This will allow you to examine your device closely and from different angles A microscope helps you to estimate the type and degree of dirt on your device You can use a microscope to choose an appropriate cleaning method and then to examine the results You can also use your microscope to judge whether your optical device such as a con...

Page 92: ... cleaning wipes Use pre moistened cleaning wipes as described in each individual cleaning procedure Cleaning wipes may be used in every instance where a moistened soft tissue or cotton swab is applied Polymer film Polymer film is available from laboratory suppliers or specialist mail order companies Using polymer film is a gentle method of cleaning extremely sensitive devices such as reference ref...

Page 93: ...put the dust cap back on or close the shutter cap if the equipment is not going to be used immediately Keep the caps on the equipment always when it is not in use All of Keysight Technologies lightwave instruments and accessories are shipped with either laser shutter caps or dust caps If you need additional or replacement dust caps contact your nearest Keysight Technologies Sales Service Office Im...

Page 94: ...for this Instrument on page 86 for the procedure relevant for this instrument If you are unsure of how sensitive your device is to cleaning please contact the manufacturer or your sales distributor How to clean connectors Cleaning connectors is difficult as the core diameter of a single mode fiber is only about 9 µm This generally means you cannot see streaks or scratches on the surface To be cert...

Page 95: ...s greasy dirt on the connector 1 Moisten a new cotton swab with isopropyl alcohol 2 Clean the connector by rubbing the cotton swab over the surface using a small circular movement 3 Take a new dry soft tissue and remove the alcohol dissolved sediment and dust by rubbing gently over the surface using a small circular movement 4 Blow away any remaining lint with compressed air An Alternative Procedu...

Page 96: ...ew dry soft tissue and remove the alcohol dissolved sediment and dust by rubbing gently over the surface using a small circular movement 4 Blow away any remaining lint with compressed air How to clean bare fiber adapters Bare fiber adapters are difficult to clean Protect from dust unless they are in use C A U T I O N Never use any kind of solvent when cleaning a bare fiber adapter as solvents can ...

Page 97: ...h isopropyl alcohol 2 Clean the plate by rubbing the cotton swab over the surface using a small circular movement 3 Using a new dry cotton swab remove the alcohol any dissolved sediment and dust 4 Blow away any remaining lint with compressed air Additional Cleaning Information The following cleaning procedures may be used with other optical equipment How to clean bare fiber ends How to clean bare ...

Page 98: ...ppropriate the cleaning methods When you insert the ferrule of a patchcord into a connector or an adapter ensure that the fiber end does not touch the outside of the mating connector or adapter Otherwise the fiber end will rub up against something which could scratch it and leave deposits Lens cleaning papers Note that some special lens cleaning papers are not suitable for cleaning optical devices...

Page 99: ...tive channel s is then deactivated and is no longer in specification The unit should be sent for repair The command Stat n ques cond can be used to identify the defective channel as detailed in the Programming Guide Example Stat2 ques cond 1 Indicates a hardware error on channel 2 of the N7747A or N7748A Data Sanitation Memory Inventory The instruments have the following memory size EEPROM 2 Mb fo...

Page 100: ...tton on the front panel briefly 1 s 2 Clear the instrument log a Send the special command DIAG SYST FLAS LOGF ERAS The contents of the log can be checked with the query READ LOGF 3 Clear the Ethernet settings a Connect to the instrument by some means other than the LAN using VISA Assistant for example over USB Send the command SYSTem COMMunicate ETHernet RESet OR b With the instrument connected ov...

Page 101: ...6 Maintenance and Troubleshooting 100 Keysight N774x Series ...

Page 102: ... Response 64 Front Panel Indicators 30 Front Panels Multiport Power Meters 18 G GPIB Interface 7 GPIB interface 27 GPIB Logic Levels 28 I Infrared sensor cards 91 Initial Inspection 7 Input trigger functions 57 Input Output Signals 12 Instrument Markings 13 IP address 23 Isopropyl alcohol 88 L LAN Interface 7 Line Power Cable 14 Line Power Connectors 12 Line Power Requirements 11 Linearity 65 M Ma...

Page 103: ...ng a configuration 41 Specification wavelength range 69 Spectral ripple power meter due to interference 69 Standard Cleaning Equipment 87 Storage conditions 70 Switch 49 T Technical Specifications High Sensitivity Optical Power Meter 74 Technical Specifications Optical Multiport Power Meter 72 Temperature for operation and storage 16 Total uncertainty 70 Trigger 56 U Ultrasonic baths 90 Uncertaint...

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Page 105: ...This information is subject to changewithout notice Keysight Technologies 2017 Edition 7 0 October 2017 www keysight com ...

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