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Bristol 428 User Manual

Multi-wavelength meter
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M
428
ODEL
M
-W
M
ULTI
AVELENGTH
ETER
3/18/16
USER'S MANUAL

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Summary of Contents for Bristol 428

  • Page 1 ODEL ULTI AVELENGTH ETER 3/18/16 USER’S MANUAL...
  • Page 2 The information contained in this publication is subject to change without notice.  2016 Bristol Instruments, Inc.

  • Page 3: Table Of Contents

    CONTENTS INTRODUCTION ........................4 Welcome ............................ 4 Safety Notices..........................4 General Safety Considerations....................5 Inspection ..........................6 INITIAL INSTRUMENT SETUP ....................7 General ............................7 Power Supply Connections ....................... 7 Signal Output Connections ......................8 OPERATION ..........................9 Start Up ............................9 Front Panel ..........................

  • Page 4: Introduction

    If you have any questions about the operation of your 428 system, please do not hesitate to call Bristol Instruments at (585) 924-2620. Or, you can contact us at service@bristol-inst.com.

  • Page 5: General Safety Considerations

    Failure to take this precaution can permanently damage your eyesight. No user serviceable parts are inside. Refer servicing to Bristol Instruments or its representatives only. To prevent electrical shock, do not remove covers. To prevent electrical shock, disconnect this instrument from mains before cleaning.

  • Page 6: Inspection

    Inspection The 428 Multi-Wavelength Meter is packed in a carton designed to give maximum protection during shipment. If the outside of the shipping carton is damaged, notify your shipping department immediately. Your shipping department may want to notify the carrier.

  • Page 7: Initial Instrument Setup

    INITIAL INSTRUMENT SETUP INITIAL INSTRUMENT SETUP General Place the 428 Multi-Wavelength Meter on a firm horizontal surface. Make sure that there is at least 2 inches (50 mm) of clearance on all sides of the instrument to allow for ventilation.

  • Page 8: Signal Output Connections

    Appendix D. Rack Mount Kit Installation The 428 Multi-Wavelength Meter can be mounted in a standard 19” instrument rack by attaching the rack mount brackets. These brackets are attached to the front bezel of the system using the 8-32 x 5/8” flat head socket screws included in the rack mount kit. For proper fit, the feet under the chassis may be removed.

  • Page 9: Operation

    Front Panel The front panel of the model 428 is shown in Figure 3.1. The display reports wavelength, power, and OSNR in various formats. It also displays configuration information that defines how data is collected and reported. The buttons control how data is collected and reported.

  • Page 10: Optical Signal Input

    Maximum safe input is 65 mW of optical power. Laser input power in excess of 65 mW can result in damage to the instrument. The optical signal under test enters the 428 system through an FC/UPC or FC/APC fiber- optic connector on the front panel of the instrument (Figure 3.1).

  • Page 11: Front Panel Controls

    Model 428 User’s Manual OPERATION Front Panel Controls Five control buttons on the front panel select and change parameters that affect how data is collected and reported (Figure 3.1). These control buttons switch between the different Display and Configuration Screens, and change the value or status of parameters on each screen.
  • Page 12 Model 428 User’s Manual OPERATION  Wavelength Units and Medium – Identifies the units chosen for the measurement of wavelength (nm), wavenumber (cm ), or frequency (THz). Also identifies the medium to which the measurement is referenced. The options are vacuum (-vac) or standard air (Std Air) at 20°C, 760 mm Hg, and 0% relative humidity.
  • Page 13 Model 428 User’s Manual OPERATION List Mode Display Screen – Main Displays wavelength, power, and optical signal-to-noise-ratio (OSNR) for up to 5 channels simultaneously. This data can be sorted by wavelength (Wav) or power (Pow). 1 3 1 0 . 6 1 0 7 1 1 .
  • Page 14 Model 428 User’s Manual OPERATION  Average (AVG) – The instrument displays the results from each measurement, or the result from an averaged number of measurements (2, 4, 8, 16, 32, 64, or 128) chosen in Config Screen 1. The instrument will display a measurement after the chosen number of interferograms is collected, averaged, and analyzed.
  • Page 15 Model 428 User’s Manual OPERATION  Max-Min – Displays the difference between the maximum and minimum values that each channel has recorded. The first column displays the difference in wavelength, and the second column displays the difference in power. The third column displays the channel number, current wavelength, and current power of a chosen channel.
  • Page 16 Model 428 User’s Manual OPERATION  Diff – Displays the difference between the start measurement and currently displayed measurement values for each channel. The first column displays the difference in wavelength, and the second column displays the difference in power. The third column displays the channel number, current wavelength, and current power of a chosen channel.

  • Page 17: Configuration Screens

    Model 428 User’s Manual OPERATION  ITU – Displays the difference in wavelength between each channel and the nearest 100 GHz-spaced ITU gridlines covering 1528.77 nm to 1563.86 nm. The first column displays the difference in wavelength values, and the second column displays the current power values.
  • Page 18 Model 428 User’s Manual OPERATION  Average En – Identifies the status of the Average function. Use the Select button to highlight the Average En value, and use the Change or Arrow buttons to turn averaging on or off. ...

  • Page 19: Configuration Screen 2

    Model 428 User’s Manual OPERATION Configuration Screen 2 Displays and allows changes to parameters specifying the conditions for valid channel recognition. W a v e L i m i t s : O n s t a r t : 1 2 6 7...
  • Page 20 Model 428 User’s Manual OPERATION  Def Ref # – Identifies the reference channel for the Delta calculation. The options for the Def Ref # are channels 1-999. Use the Select button to highlight the Def Ref # value’s left most digit, use the Change or Arrow buttons to set the desired number, and use the Select button to highlight the next digit to the right.
  • Page 21 Model 428 User’s Manual OPERATION Configuration Screen 4 Allows the measurement parameters and instrument settings to be saved and recalled. Changes to some settings, such as the Ethernet IP Address, will not take effect until the instrument is rebooted. S a v e S e t t i n g s...

  • Page 22: E T H E R N E T A D D R E S

    Model 428 User’s Manual OPERATION  DHCP – Identifies the status of the Dynamic Host Configuration Protocol (DHCP) used for remote communications via Ethernet. When DHCP is enabled (Yes), it automatically assigns an open IP Address to the instrument. When DHCP is disabled (No), the network administrator must manually assign the instrument an open IP Address.

  • Page 23: Config: 6

    Model 428 User’s Manual OPERATION Configuration Screen 6 Displays various details about the instrument. With the exception of the IP Address, these parameters are fixed, and may not be edited. W a v e l e n g t h M e t e r M o d e l 4 2 8 A V e r 0 .

  • Page 24: Optical Spectrum Analyzer Software

    Software Installation The NuView Display Software provided on the Application Software CD remotely connects to the model 428 and displays the spectrum of the optical input signal and the wavelength, power, and OSNR measurements made by the 428 system. The following computer hardware is required to run the software.

  • Page 25: Spectrum Screen

    Spectrum Screen The Spectrum Screen of the NuView Display Software displays the measured spectrum of the optical input signal and quantitative data collected from the 428 system. Its display features are described in this section. Figure 4.2: Components of the Spectrum Screen...

  • Page 26: Function Descriptions

    Optical Channels Table Displays the wavelength, power and optical signal-to-noise ratio for each optical channel reported by the 428 system. Once the application is connected to the instrument, the Optical Channels Table will update continuously until the connection is terminated...
  • Page 27 Pause button stops data collection and the Spectrum Display and Markers Table display the last measured data. The Optical Channels Table continuously updates when the NuView Display Software is connected to the 428 system. Spectrum Thumbnail This is a small representation of the entire measured spectrum. When the Spectrum Display shows only a portion of the measured spectrum (see Display Zoom function), the thumbnail highlights the displayed spectrum with a box.
  • Page 28 Spectrum Thumbnail will pan the Spectrum Display. Optical Channels Table This table displays each channel identified by the 428 system’s peak-finding algorithm, and arranges them in ascending order of their spectral positions. Once the application is connected to the instrument, the Optical Channels Table and Wavelength Display (described in the next section) will update continuously until the connection is terminated.
  • Page 29 Model 428 User’s Manual REMOTE USER INTERFACE Markers Table A pair of Markers are available that can be positioned at any point in the Spectrum Display for quantitative analysis. A Marker identifies the intensity of the measured spectrum at a specific spectral position. They are displayed as small rectangles at the top of the Spectrum Display with vertical tracing lines extending to the spectral axis.
  • Page 30 Model 428 User’s Manual REMOTE USER INTERFACE Collapsing the Spectrum Display reduces the viewing area of the measured spectrum and makes the Optical Channels and Markers Tables visible (Figure 4.8). Figure 4.8: Spectrum Display Collapsed Status Bar The Status bar is located at the bottom of the Spectrum Screen. It provides information about the current state of the instrument as described below.

  • Page 31: Wavelength Screen

    The Wavelength Screen of the NuView Display Software displays both wavelength and power from the Main Mode Display Screen on the 428 instrument front panel. The NuView Display Software wavelength and power units are set from the View menu, and independent from the wavelength and power units on the 428 instrument’s front panel.
  • Page 32 Bristol proprietary format file. Click on Open Spectrum, browse to find the desired spectrum, select it, and click on Open to display the saved spectrum. Opening a saved spectrum will end connection, if any, from the NuView Display Software to the 428 system.
  • Page 33 Spectrum, enter the file name and folder location, select *.csv or *spectrum, and click on Save. Files saved in the Bristol proprietary format can only be read by the NuView Display Software, and the NuView Display Software cannot read files in the CSV format.
  • Page 34 NOTE: In other scientific publications, the units of nanometers, micrometers, and wavenumbers may refer to the values in an air, standard air, or vacuum environment. The 428 Wavelength Meter provides spectral measurements as values in a vacuum environment, and units that are dependent on environment are given a “-vac”...
  • Page 35 Instrument Menu  Connect – The 428 system can be connected to a PC by either USB 2.0 interface or Ethernet interface. Click on Connect and choose between “Connect via COM port” or “Connect over the network.” If “Connect via COM port” is chosen, click on Scan to search for all 428 systems connected to the PC.
  • Page 36 REMOTE USER INTERFACE Help Menu  About – Displays the NuView Display Software version, the embedded software versions, and information about the 428 system.  Manual – Opens a file dialog to select the 428 User’s Manual. Bristol Instruments, Inc.

  • Page 37: Remote Communications

    NOTE: For the vast majority of user applications, the default rate of 921600 is the correct Baud Rate for the 428 system and should not be changed. If the USB Baud Rate must be changed, use the Select button to highlight the USB Baud Rate value on Config Screen 4 and use the Change or Arrow buttons to change the USB Baud Rate.
  • Page 38 NuView Display Software.  Cabling - The Ethernet port of the model 428 can be connected to the network hub or switch using a straight-through CAT-5 Ethernet cable since regular ports (non- uplink) on all hubs and switches are already crossed-over by default. A crossover cable is required if, and only if, Auto-MDIX is not supported.
  • Page 39 Click on Start/Programs/Accessories/Command Prompt, or type “cmd” into the Search bar. To start a Telnet session, type “Telnet” at the command prompt followed by the 428 system’s IP address displayed on Configuration Screen 4. C:\>Telnet 192.168.1.109 MityDSP Telnet Server Copyright 2005, Critical Link LLC Ctrl-D –...

  • Page 40: Scpi Communications Scheme

    Model 428 User’s Manual REMOTE COMMUNICATIONS SCPI Communications Scheme This section describes the communication scheme of the 428 Multi-Wavelength Meter. It follows the Standard Commands for Programmable Instruments (SCPI) Syntax and Style Guidelines. The following table provides a summary of commands by subsystem.
  • Page 41 Model 428 User’s Manual REMOTE COMMUNICATIONS :FETCh {:ARRay | :SCALar} {:POWer | Queries power, or wavelength that was measured :ENVironment | :FREQuency | :WAVelength | during the last measurement cycle and returns :WNUMber}? immediately. When used with a :SCALar command, only one value is returned.
  • Page 42 Model 428 User’s Manual REMOTE COMMUNICATIONS CALCulate2:WLIMit[:STATe]? Queries the wavelength limits state. :CALCulate2:WLIMit[:STATe] {ON | OFF} Turns wavelength limits on or off. :CALCulate2:WLIMit:{ :STARt | STOP }? Queries wavelength limit STARt or STOP wavelength. :CALCulate2:WLIMit:STARt {1267…1686} Sets the starting wavelength for the wavelength limit range.
  • Page 43 Model 428 User’s Manual REMOTE COMMUNICATIONS :SENSe:AVERage {OFF | 2 | 4 | 8 | 16 | 32 | 64 | Sets the wavelength and power averaging state to 128} either a numerical value (power of 2) or OFF. :SENSe:MEDium? Queries the type of medium for the wavelength calculation.

  • Page 44: Scpi Command Detail

    Model 428 User’s Manual REMOTE COMMUNICATIONS SCPI Command Detail This section provides detailed information for all SCPI programming commands of the 428 Multi-Wavelength Meter. The commands are organized by subsystem. Common Commands *CLS Description The *CLS (clear status) command clears the event status register and the error queue.
  • Page 45 The last value is the software version and will reflect the actual version number. Query Response BRISTOL WAVELENGTH METER, 428A, 1109, 0.79 *OPC? Description The *OPC (operation complete) query returns a one (1) when all pending device operations are complete.
  • Page 46 Model 428 User’s Manual REMOTE COMMUNICATIONS Commands Affected by *RST COMMAND SETTING AFTER AN *RST COMMAND :CALCulate:DELTa[:STATe] :CALCulate:DELTa:METHod :CALCulate:DELTa:REF :CALCulate:DRIFt[:STATe] :CALCulate:DRIFt:METHod STARt :CALCulate:STARt[:STATe] :CALCulate2:AVERage[:STATe} :CALCulate2:AVERage:COUNt :CALCulate2:FPAV :CALCulate2:PEXCursion 10 dB :CALCulate2:PTHReshold 10 dB :CALCulate2:SNR:AUTO :CALCulate2:SNR:WAVelength 1470 :CALCulate2:SNR:BANDwidth 0.10 :CALCulate2:THREShold :CALCulate2:WLIMit[:STATe] :CALCulate2:WLIMit:STARt...
  • Page 47 Model 428 User’s Manual REMOTE COMMUNICATIONS *STB? Description The *STB (status byte) query returns the current value of the instrument's status byte. Query Response Returns an integer that is the sum of all the bit values for those bits that are set.
  • Page 48 Model 428 User’s Manual REMOTE COMMUNICATIONS Measurement Instruction Functions :POWer? Description Returns a power reading in either Watts or dBm as specified by the :UNIT:POWer function. Query Response For a SCALar query, one numeric value is returned. For an ARRay query, an integer value indicating the number of entries, followed by comma separated numerical values in fixed point notation.
  • Page 49 Model 428 User’s Manual REMOTE COMMUNICATIONS :WNUMber? Description Returns an input laser reading in units of cm Query Response A single numerical value (e.g., 6643.2891) for SCALar. An integer value indicating the number of entries, followed by an array of comma separated numerical values (e.g.
  • Page 50 Model 428 User’s Manual REMOTE COMMUNICATIONS :DRIFt[ :STATe ]? Description Queries the state of the :DRIFt function. Query Response OFF or ON Examples :CALC:DRIF:STAT? :CALC:DRIF? :DRIFt[ :STATe ] { ON | OFF } Description Sets the state of the :DRIFt function to either ON or OFF.
  • Page 51 Model 428 User’s Manual REMOTE COMMUNICATIONS :DELTa:METHod? Description Queries the state of the :DELTa:METHod function. Query Response { ITU | REF} Examples :CALC:DELT:METH? :DELTa:METHod { ITU | REF } Sets the state of the :METHod function to either ITU (to get current – ITU Description grid values) or REF (to get current –...
  • Page 52 Model 428 User’s Manual REMOTE COMMUNICATIONS CALCulate2 Subsystem Functions :DATA? Description Queries the frequency spectrum of the input signal. Query Response An array of comma separated numerical values in scientific notation. Examples :CALC2:DATA? (Note: to accurately recreate the frequency axis see...
  • Page 53 Model 428 User’s Manual REMOTE COMMUNICATIONS :THREShold {REL | ABS} Description Sets the threshold type to either relative (REL) or absolute (ABS). *RST value Examples :CALC2:THRES ABS :WCOE? Description Queries the factory set wavelength calibration coefficient. Used to properly scale the x axis of the spectrum. See Appendix F.
  • Page 54 Model 428 User’s Manual REMOTE COMMUNICATIONS :FPAV? Description Queries the Fabry-Perot calculation method state. Query Response {ON | OFF} Examples :CALC2:FPAV? :FPAV{ON | OFF} Description Sets the Fabry-Perot calculation method to ON or OFF. If ON, the wavelength is calculated as the weighted average of all spectral peaks and the power is the total power of all spectral peaks.
  • Page 55 Model 428 User’s Manual REMOTE COMMUNICATIONS :AVERage:COUNt {2 | 4 .. | 128} Determines the number of scans used to calculate wavelength and Description power when the average function is enabled. The choices are 2, 4, 8, 16, 32, 64, or 128.
  • Page 56 USB or Ethernet interfaces. These commands do not affect the readings from the SCPI interface. DISPlay Subsystem Functions :DIALog? Description Queries the display dialog currently shown by the 428. Query Response { MAIN | LIST | POWer } Examples :DISP:DIAL?
  • Page 57 Model 428 User’s Manual REMOTE COMMUNICATIONS :UNITs:POWer? Description Queries the units being used for power values on the front panel display. Query Response { DBM | MW } Examples :DISP:UNIT:POW? :UNITs:POWer { DBM | MW } Description Sets the units being used for power values on the front panel display. It is the same as changing the power units via the front panel display.
  • Page 58 Model 428 User’s Manual REMOTE COMMUNICATIONS :MEDium? Description Queries the medium used for wavelength calculations. Query Response { AIR | VAC } Examples :SENS:MED? :MEDium {AIR | VACuum} Description Sets the medium used for wavelength calculations. It is the same as using the Medium function via the front panel display.
  • Page 59 Model 428 User’s Manual REMOTE COMMUNICATIONS STATus Subsystem Functions :QUEStionable:CONDition? Description Queries the SCPI Questionable Status Register which contains bits that indicate that one or more measurement types are of questionable accuracy. The bits in the register are described in the table below.
  • Page 60 Model 428 User’s Manual REMOTE COMMUNICATIONS SYSTem Subsystem The SYSTem subsystem { XE “Commands:SYSTem” } supplies information and status about the SCPI command parser. SYSTem Subsystem Functions :ERRor? Description Reads error strings from the SCPI Error Queue. If the Error Queue has any entries, the Error Queue bit is set in the Status Byte.
  • Page 61 Model 428 User’s Manual REMOTE COMMUNICATIONS UNIT Subsystem For the instrument, there is a single query and command in the UNIT subsystem { XE “Commands:UNIT: }. This is used to query and change the units that the SCPI interface uses for reporting power.

  • Page 62: Appendix A - Specifications

    Model 428 User’s Manual – APPENDIX A SPECIFICATIONS APPENDIX A – SPECIFICATIONS 428A 428B CW and modulated OPT I CA L SI GNA L WA V EL EN GT H 1270 – 1650 nm (182 – 236 THz) Range ± 0.2 parts per million ±...

  • Page 63: Appendix B - Warranty & Service

    Bristol Instruments. If you have any questions about the operation of your 428 system or need to have your 428 system serviced, please call Bristol Instruments at (585) 924-2620. Or, you can contact us at service@bristol-inst.com.

  • Page 64: Appendix C - Code Updates

    PC, with the NuView Display Software installed on the PC. Process Connect the PC to the 428 system using the provided USB cable and turn the instrument on. Copy the utility Bristol428Update.bat to a folder on your PC.

  • Page 65: Appendix D - Monitor Port

    APPENDIX D – MONITOR PORT APPENDIX D – MONITOR PORT The Monitor Port on the rear panel of the 428 Multi-Wavelength Meter provides a combination of analog and digital signals for observing the interference fringe signals and measurement timing signals using an oscilloscope. The Monitor Port uses a 9-pin, female, D-sub style connector shown in Figure D-1 and with a pinout described in the table below.

  • Page 66: Appendix E - Troubleshooting

    Model 428 User’s Manual APPENDIX E – TROUBLESHOOTING APPENDIX E – TROUBLESHOOTING The 428 Multi-Wavelength Meter continually checks the quality of the signal it is analyzing and alerts the user to unusual conditions that might affect the precision of the wavelength measurement.
  • Page 67 APPENDIX E – TROUBLESHOOTING NuView Error Messages The following table provides a list of error messages displayed by the NuView Display Software and what they mean. If an error message is displayed, please call Bristol Instruments for additional information and/or instructions. Error Message...

  • Page 68: Appendix F - Spectral Calculation

    Model 428 User’s Manual APPENDIX F – SPECTRAL CALCULATION APPENDIX F – SPECTRAL CALCULATION The spectrum of the input signal can be recovered by using the query “:CALC2:DATA?” The response will be the spectral intensity in scientific notation for each of the 16384 spectral frequency bins.

  • Page 69: Declaration Of Conformity

    EC and FCC Declaration of Conformity Manufacturer’s Name: Bristol Instruments, Inc. Manufacturer’s Address: 50 Victor Heights Parkway Victor, NY 14564 USA declares this product: Product Name: Wavelength Meters Model Number(s): 428A, 428B conforms to the following directives: 73/23/EEC 89/336/EMC as a result of having been tested satisfactorily to the following standards:...
  • Page 72 Bristol Instruments, Inc. 50 Victor Heights Parkway Victor, NY 14564 Tel: (585) 924-2620 Fax: (585) 924-2623 Email: service@bristol-inst.com...

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