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OMM-6810B Optical Power and Wavelength Meter

1. HW3hon iol 9 8 7 Event Status Enab ENAB E e Register VE Message Available Standard Event Status Enable Register ESE LOGICAL OR 0 Operation Complete 1 Not Used 2 Query Error 3 Device Dependant Error 4 Execution Error 5 Command Error 6 Command Error 7 Power On LOGICAL OR 0 Power Overrange 1 Power Underrange 2 Wavelength Overscale 3 Wavelength Underscale 4 Input Unstable 7 Lambda hold activated 12 Calculation Error 13 Hardware Error 14 Software Error 15 Checksum Error Service Error Available Status Byte Register STB Service Request Enable Register SRE 7 Request SRQ LOGICAL OR 0 Event Summary 1 Condition Summary 2 Not Used 3 Not Used 4 Message Available 5 Event Status Summary 6 SRQ Master Status Summary 7 Error Message Available Figure 3 12 OMM 6810B Status Reporting Schematic Diagram OMM 6810B 47 GPIB IEEE 488 2 REMOTE OPERATION Remote Interface Messages 48 OMM 6810B IU Jx Lightwave CHAPTER COMMAND REFERENCE Ei E El a li a El El mH Li El B ia a E Li E El This chapter is a guide to the syntax and usa
2. Figure 4 2 Command Path Structure iU mJx Lightwave COMMAND REFERENCE Command Paths L OMM 6810B Device Command Reference The following pages provide a detailed reference for the 6810B device dependent commands This reference contains useful information for both local and remote operation References to front panel buttons and indicators are shown in caps for clarity In the title of each command description the required letters are capitalized and the optional letters are in lower case For example the command heading POWer REFerence has the required letter POW REF but the use of POWER REFERENCE is allowed for software clarity Additional terminology is provided in this chapter as well as Chapter 3 Note Some GPIB commands are not valid for some optical measurement heads that might be used with the OMM 6810B The instruction manual for the measurement head contains a list of GPIB commands that are valid for that particular head BRIght FRONT PANEL REMOTE The BRIght command is used to set the intensity of the front panel display white space Parameters The lt nrf value is an integer between 0 and 5 Zero is a dark display and five is the brightest possible display Note This command has the same effect as pressing the BRIGHT button to cycle through the six possible brightness levels The keypad is backlighted the intensity of the keypad is also set by this command If the power to
3. SUBSTITUTE NAME VALUE ON 1 OFF 0 OLD 1 NEW 0 TRUE 1 FALSE 0 The ON parameter name could be used in place of the 1 The commands below are equal RANGE AUTO 1 RANGE AUTO ON and RANGE AUTO TRUE Multiple Parameter Commands The PREselect SAVE command expects two parameters A space is required between the command header and the first parameter and a space between the first parameter and the second Queries A query has no space between the mnemonic and the question mark as in WAVE Terminators The 6810B uses a terminator of lt NL gt lt END gt new line EOI In almost all cases these terminators are automatically inserted by the system controller or GPIB driver 32 OMM 6810B iU Jx Lightwave GPIB IEEE 488 2 REMOTE OPERATION Common Commands and Queries Common Commands and Queries This section contains a list of the common commands and queries which are supported by the 6810B These commands are distinguished by the asterisk which begin each mnemonic The common commands and queries are listed in alphabetical order and a brief description of their functions and syntax is given below For more information on these commands refer to the ANSI IEEE 488 2 1987 standards reference CAL This command is the CALIBRATION QUERY The analog to digital A D converters within the 6810B require periodic calibration to maintain specified accuracy This calibration is performed aut
4. or 0 vi OMM 6810B il Jx Lightwave 01 10 WARRANTY ILX LIGHTWAVE CORPORATION warrants this instrument to be free from defects in material and workmanship for a period of one year from date of shipment During the warranty period ILX will repair or replace the unit at our option without charge Limitations This warranty does not apply to fuses lamps defects caused by abuse modifications or to use of the product for which it was not intended This warranty is in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for any particular purpose ILX Lightwave Corporation shall not be liable for any incidental special or consequential damages If a problem occurs please contact ILX Lightwave Corporation with the instrument s serial number and thoroughly describe the nature of the problem Returning an Instrument If an instrument is to be shipped to ILX Lightwave for repair or service be sure to 1 Obtain a Return Authorization number RA from ILX Customer Service 2 Attach a tag to the instrument identifying the owner and indicating the required service or repair Include the instrument serial number from the rear panel of the instrument 3 Attach the anti static protective caps that were shipped with the instrument and place the instrument in a protective anti static bag 4 Place the instrument in the original packing container with at
5. E 101 lt program mnemonic gt is too long E 102 PROGRAM MESSAGE UNIT is too long E 103 DEFINITE LENGTH ARBITRARY BLOCK PROGRAM DATA length too long E 104 NON DECIMAL NUMERIC PROGRAM DATA type not defined E 105 DECIMAL PROGRAM DATA exponent not valid E 106 DECIMAL PROGRAM DATA digit expected E 107 DECIMAL PROGRAM DATA gt digit not expected E 108 DECIMAL PROGRAM DATA more than one decimal point E 109 DECIMAL PROGRAM DATA more than one exponent indicator E E 110 SUFFIX PROGRAM DATA must have digit following sign E 111 SUFFIX PROGRAM DATA must have alpha character following operator E 113 ARBITRARY BLOCK PROGRAM DATA length less than digit count E 114 DEFINITE LENGTH BLOCK PROGRAM DATA premature end of data E 115 PLACE HOLDER PROGRAM DATA identifier not valid E 116 Parser syntax error charter was not expected E 120 program mnemonic gt Lookup word as part of a header path has no commands E 121 program mnemonic gt Lookup word as part of a header path is not found E 122 program mnemonic gt Lookup cannot find a null entry E 123 program mnemonic Lookup word within context of current path is not found E 124 program mnemonic gt Lookup failed because query command type match failed E 125 program mnemonic Lookup word within context of commond command path is not found E 126 Too few or too many program data elements E 201 PROGRAM DATA value out of ran
6. 0 0 0 ees 30 Getting Started with GPIB 0 0 nes 30 Overview of the OMM 6810B Syntax 0c cee eee eee 30 Using Commands with Parameters 000 cece een eee 31 Substitute Parameter Names 2 000 c eects 31 Multiple Parameter Commands 0000s 32 Quieres 2s cea Hwee isda dade aaa SUP led E ada 32 Terminalo uu eee ane nde Ros Re deor RS PE deg s s RR gg 32 Common Commands and Queries 0200 0c eee ees 33 Advanced Programming ssllsellsle elles 42 Error Messages sevo een RE Rex d RACER AREER ae et 43 Status Reporting 0 0 00 cece ees 43 Device Dependent Event and Condition Registers 44 Operation Complete Definition llle 44 Command Timing and Completion 000 cece eee eee 44 Input Buffer and Output Data 20 0000 ee 45 Remote Interface Messages 0 cece eee eee 45 Interface Function Subsets 0 000 cece eee eee 46 Remote Messages 200 ees 46 Non Supported Remote Interface Messages 000 eee eae 46 Chapter 4 Command Reference Terminology ccc ez a eid de Y be eee adhe 49 Commands and Queries 000 0000 cece ss 50 Substitute Parameter Names lseeeee A 50 01 10 OMM 6810B iii Ld n dM iv Compound Command Structure 0 cee ees 50 Common Commands 00 ccc eee es 51 OMM 6810B Devic
7. Command Timing and Completion This section describes for each device dependent command whether that command is performed in an overlapped or sequential manner In other words it states whether the next command may begin while this command is being executed or if the next command must wait until this command is completed before its execution begins All 6810B device dependent commands are executed in an overlapped manner and the operation complete flag is set after the conditions outlined earlier in this have been satisfied The WAI common command is an example of a sequential command which forces the next command to wait until the no operation pending flag is true This is essentially the same as waiting for the OPC flag to become true because the no operations pending flag is used to set the OPC flag bit O of the Standard Event Status Register In normal operation the overlapped commands execute faster than would appear by querying the OPC flag This is due to the nature of the non volatile memory storage process This is done to ensure that the OPC flag is never set IU Jx Lightwave 01 10 GPIB IEEE 488 2 REMOTE OPERATION Input Buffer and Output Data prematurely However in most cases the individual operation will be completed immediately The speed of writing to non volatile memory NVRAM is slow compared to processor speed and the new information to be written is placed on a queue to reduce the processo
8. f l True ee Event Summary Service Request m SRQ Logical OR uM 7 1514 13 2110 Service Request Enable Register 0 Event Summary 4 Message Available 1 Condition Summary 5 Event Status Summary 2 N A 6 Request Service Master Status Summary 3 N A 7 Error Message Available Figure 3 11 Service Request Enable Register 40 OMM 6810B iU mJx Lightwave GPIB IEEE 488 2 REMOTE OPERATION Common Commands and Queries SRE Response The SERVICE REQUEST ENABLE QUERY allows the user to determine the contents of the Service Request Enable Register y Brinary Integer Sum of enabled bits in Figure 3 11 The value must be between 0 and 255 STB Response The STATUS BYTE QUERY allows the programmer to read the Status Byte described in Figure 3 11 A X X STB J X gt i Binary Integer Sum between 0 and 255 See Figure 3 11 TST Response REMOTE The SELF TEST QUERY initiates an internal self test and returns a response when complete Z 0 Self test completed with no errors 1 Self test was not completed or encountered errors WAI 01 10 The WAIT TO CONTINUE command prevents the instrument from executing any further commands until the No Operation Pending flag is true This allows the programmer to make the 6810B wait for the completion of an operation before continuing i P N N gt
9. gt WAI OMM 6810B 41 42 j GPIB IEEE 488 2 REMOTE OPERATION 4 _ Advanced Programming Advanced Programming OMM 6810B Once you are familiar with the command syntax and structure you may wish to take advantage of some programming shortcuts which are available Due to the tree walking capabilities of the 6810B firmware you may elect to write command strings without constantly repeating the entire command path for each command It may be necessary to review Table 4 1 for the following discussion The first command in the string must have it s entire path entered Once a command level is reached other commands which are at the same level or higher level may then be entered without repeating the entire path To accomplish this a semicolon must be used to separate the commands in the string The command following the semicolon need not specify its full path if the same path which was previously used could be used for the new command For example the following legal command string could be used to 1 set the 6810B to display wavelength in nanometers and then 2 read the wavelength reference point WAVE MODE NM REFERENCE In this case the path WAVE is remembered by the 6810B when the REFERENCE command is sent Otherwise the 6810B would proceed up the command tree looking for a command until it reaches the root level An error is generated if the command cannot be found Care must be taken to avoid err
10. PO ow gt O gt gt O Parameters None Response response lt response where the response data is a boolean value representing the status of the autoranging mode 0 manual gain ranging mode 1 auto gain ranging mode Notes This command has the same effect as viewing the POWER AUTO indicator on the front panel of the multimeter Auto manual ranging modes have different effects on the front panel power display Autoranging control can be controlled by issuing the POWer AUTO command Examples POWER AUTO reponse 1 means the unit is autoranging the electrical gain range POW AUTO response 0 means the unit is in manual gain ranging mode 70 OMM 6810B IU Jx Lightwave COMMAND REFERENCE Command Paths POWer MODE FRONT PANEL REMOTE The POWer MODE command is used to set the units of the front panel display This command is also used to change the display between absolute and relative power measurements space gt den white x strine d data space gt lt string data gt Parameters The first lt string data gt parameter represents the display scale as shown below LIN Linear units multimeter chooses between nW uW mW and W LOG Logarithmic units dBm DELTA Delta Power in the current units linear or log If the first lt string data gt is DELTA then the second lt string data gt parameter determines whether or not the AP mode is being enabled or disabled as fol
11. mode as follows NM DELTA NM CM DELTA CM Notes This command has the same effect as viewing the wavelength display unit indicators When the WAVE query is issued the wavelength is returned in the units of the present display nm cnr Aa Examples WAVE MODE response NM means the front panel is displaying the absolute wavelength in nanometers The GPIB query WAVE returns absolute wavelengths in nanometers WAVE MODE response DELTA CM means the front panel is displaying relative wavelength in wavenumbers The GPIB query WAVE returns relative wavelength in wavenumbers 92 OMM 6810B iWILX Lightwave COMMAND REFERENCE Command Paths WAVE OFFset FRONT PANEL REMOTE The WAVE Offset command is used to enter an offset wavelength that will be added to future wavelength measurements white space gt Parameters The lt nrf value is a floating point number representing the wavelength offset value This number is added to future power measurements as shown below A corrected A uncorrected cal factor Notes This function is a GPIB command only To enter an offset via the front panel the user calibration procedure must be executed Refer to Chapter 6 of the optical measurement head instruction manual The CAL USER ON OFF command can be used to enable and disable the effects of the user calibration offset Examples WAVE OFFSET 2 0 CM action two wavenumbers will be added to future w
12. terminator gt 0 lt CR gt lt NL gt lt END gt 4 lt NL gt lt 4END gt 1 lt CR gt lt NL gt 5 NL 2 lt CR gt lt END gt 6 END 3 CR CR NL END 0 is the default type Use of any terminator other than number 4 removes the OMM 6810B from strict compliance with the IEEE 488 2 standard Although the CR is recognized as a white space by the IEEE 488 2 specification it is used as a possible terminator in order to be compatible with GPIB products which do not meet the IEEE 488 2 standard TERM response 0 means the selected program message terminator is the CR NL END characters in that order iU Jx Lightwave COMMAND REFERENCE l l Command Paths i ek TIME FRONT PANEL REMOTE The TIME query allows the programmer to determine how much time has passed since the multimeter was last powered up Parameters None Response response data gt lt response terminator gt where the response is character data in the form hours minutes seconds Notes The TIME clock is independent of the TIMER clock The clock turns over after about 1193 hours Example TIME response 0 01 02 36 means that 1 minute and 2 36 seconds have passed since the OMM 6810B was powered up 01_10 OMM 6810B 85 COMMAND REFERENCE Command Paths TIMER FRONT PANEL REMOTE The TIMER query allows the programmer to determine how much time has passed since
13. 2 for more details Line Voltage Selection Line voltage selection requires opening the case and exposure to potentially lethal voltages These procedures are to be performed by qualified personnel only Consult the factory for service information 100 OMM 6810B uix Lightwave CHAPTER TROUBLESHOOTING 5 B El a li a El El mH El HE B E t El Li E This chapter is intended to be used as a guide when the OMM 6810B does not perform as expected It is not a service manual rather a guide to alleviate basic problems which may arise during operation Hardware Troubleshooting Guide If you have difficulty operating the 6810B refer to the symptoms listed here Some of the common causes and corrective actions for these symptoms are listed in this section If additional symptoms persist contact your ILX Lightwave representative Symptom Corrective Action 6810B will not power up Check the power cord to make sure that it is properly connected Ifthe above suggestion fails make sure the line voltage matches power line voltage Measurement will not stabilize The 6810B monitors the stability of the signal under test If the wavelength of the signal is changing by more than 1 0 nm the HOLD indicator is lit and the last good wavelength is held on the display Wavelength reading instability may be caused by excessive noise or modulation of the laser source Ensure the laser source is stable and that there is no intentional mo
14. 6810B Each of the registers may be accessed by a command or query These commands are shown near each register diagram in Figure 3 12 01 10 OMM 6810B 43 44 OMM 6810B al GPIB IEEE 488 2 REMOTE OPERATION Status Reporting Device Dependent Event and Condition Registers The Event Registers are used to report events which occur during the operation of the instrument Events differ from conditions in that events signal an occurrence once and are not reset until the Event Register is queried or the 6810B is powered off Conditions reflect the current state of the device and therefore may change many times during operation Querying a Condition Register does not change its contents Operation Complete Definition Note that bit 0 of the Standard Event Status Register contains the Operation Complete flag see OPC Section 3 5 9 This bit may be used to signal an SRQ to the controlling software for more efficient interrupt driven software Enable the SRQ by setting bit 0 in the Standard Event Status Enable Register ESE and bit 5 in the Service Request Enable Register SRE This may be used to initiate service request routines which depend on the completion of all previous commands The following conditions define Operation Complete within the 6810B The controller which is updating the hardware is idle No NVRAM non volatile random access memory write cycles are in progress Nocalibration routines are running
15. 8 means the wavelength reference level is 632 8 nm WAVE REF response 12000 means the wavelength reference is 12000 cm ZERO FRONT PANEL REMOTE The ZERO command activates the zeroing function to remove the effecs of background light Parameters None Notes This command has the same effect as pressing the ZERO button on the front panel The zeroing procedure is described in Chapter 2 This command starts the zeroing process If the unit has already been zeroed this command disables the effects of the zero The status of the zeroing may be obtained via the ZERO query Examples ZERO action initiates the zeroing procedure 96 OMM 6810B iit iLX Lightwave COMMAND REFERENCE Command Paths ZERO FRONT PANEL REMOTE The ZERO query returns the status of the zeroing function Parameters None Response response data gt where a response of 0 means the unit is not zeroed A response of 1 means the unit has been zeroed A response of 2 means the unit is currently being zeroed Notes This query has the same effect as viewing the ZERO indicator on the front panel display The zeroing procedure is described in Chapter 2 Examples ZERO response zero the zero function is disabled ZERO response two the unit is currently zeroing response terminator gt 01_10 OMM 6810B 97 COMMAND REFERENCE T Error Messages Error Messages Error messages may appear o
16. PROGRAM MESSAGE UNIT elements commands from one another within a PROGRAM MESSAGE The syntax for a PROGRAM MESSAGE UNIT SEPARATOR is shown in Figure 3 4 26 OMM 6810B IU Jx Lightwave GPIB IEEE 488 2 REMOTE OPERATION ANSI IEEE 488 2 Definitions gt gt Pd rogram o rogram N prog SV AN prog s message unit E message unit Figure 3 4 PROGRAM MESSAGE UNIT SEPARATOR gt Syntax Diagram PROGRAM HEADER SEPARATOR gt The PROGRAM HEADER SEPARATOR separates the lt COMMAND PROGRAM HEADER GPIB command from the PROGRAM DATAs first parameter after the command A single white space must be used to separate the command from the first parameter Note however commands may be compounded as shown later in this section compound command program header Some of the 6810B remote commands require a compound structure This is done to distinguish between different commands of the same type The compound command structure is similar to a directory path structure as found in DOS For example commands which deal with the 6810B s power display mode have the path POWER as in the command to set the display to the logarithmic mode POWER MODE LOG A compound command program header is a compound command heading which may be followed by program data parameters The device s command structure is a tree as shown in Figure 4 2 A compound command or compound command program header determines t
17. ae ieee eles 10 s 44 ad ede enna aod A a EA A a eta ened hedges 10 Buttons Indicators 0 0 a E EE SE eae 10 01_10 OMM 6810B i Ld n dM Local Gorittol erem ctt e t og Shale Sce ge dae Soto RAUS aes 10 Remote Control 0 0 0 0 ccc eee tenets 11 GPIB Address dae ad oa da ahaa a edad ae aa ae eee Oa 11 Power Autoranging Manual Control 000 0c eee eee ee 11 Power Up Down Arrow Buttons 00 00 cee ee 12 Wavelength Automatic Manual Control 0 000 eee ee 12 Setting the Wavelength 00 cece eee eee 12 Wavelength Store Control liliis 13 Wavelength Recall Control 0 0 00 cece eee 13 WAVELENGTH Left Right Up Down Arrow Switches 14 User Calibration eng prex ERE C eye Re um sed RAA VUA 14 ZONG size bum Eua eee ie aed REESE PRO Rae ee eas 15 Power Display Units llle 15 Wavelength Display Units 0 0 ee 16 Delta Power Display Control 0 0c eee eee 16 Delta Lambda Display Control 0000 e eee eee eee 16 View Reference 000 cece eee eens 17 Brightness Control 0 00 ccc teens 17 ZOOM Control dez dice eid ae dda aia S doe EUR Y Sadana ews 17 Rate Control 2 2 vu non eaters die UR Rn Y wate a RR cs 17 Hold l dicator 204 user RR eset Ret e Ree 48 18 Error DISplay i ii goes tege dca Ge dee doen eee o S Rd 18 Rear Panel Connections liulllssllelle llle eese 19 AC P
18. below Manually changing the electrical gain range Setting the GPIB address Setting the power during the User Calibration Press the WAVELENGTH AUTO button to toggle the unit between automatic wavelength measurements and manual wavelength settings If the LED above the WAVELENGTH AUTO button is lit the unit is measuring the wavelength of the source and AUTO automatically setting the correct detector responsivity for power measurements If the LED above the WAVELENGTH AUTO button is not lit the unit is in manual wavelength mode where the WAVELENGTH LEFT RIGHT UP and DOWN arrow buttons are used to manually set the wavelength of the source being measured This feature is disabled with power only measurement heads 110 OMM 6810B uix Lightwave 01 10 WAVELENGTH ee Se e STORE A Ce m ZERO LOG LIN Loc uN nm cm Power and or Wavelength Measurement EG In manual wavelength mode it is important to porgram the 6810B with the wavelength of the laser under test Use the WAVELENGTH LEFT and RIGHT arrow buttons to select the digit on the wavelength display that will be changed Then use the WAVELENGTH UP and DOWN arrow buttons to increment or decrement the selected digit If no buttons are pressed in three seconds the displayed wavelength is set and the digit will stop flashing It is possible to store four commonly used wavelengths in the 6810B Refer to Cha
19. blink Pressing DISPLAY ZOOM again places the bargraph into normal sensitivity mode where each segment represents 7 of the total power within the selected gain range The end points of the bargraph are solidly illuminated Rate Control The DISPLAY RATE button controls the speed at which measurements are taken by the 6810B Repeatedly RATE pressing DISPLAY RATE causes the instrument to cycle through the three possible rates The measurement rate is determined by viewing the flashing indicator above the POWER display The measurement rate for the SLOW rate is 60ms Sample and the input bandwidth is 1 Hz A sliding average is taken with sixteen samples The display is updated every 60ms and the rate indicator flashes at a frequency of 0 5 Hz OMM 6810B 17 INSTALLATION AND OPERATION Front Panel Controls Use SLOW when very stable readings are required but slower measurement time is acceptable The measurement rate for the MEDIUM rate is 60ms Sample and the input bandwidth is 10 Hz A sliding average is taken with four samples The display is updated every 60ms and the rate indicator flashes at a frequency of 1 Hz The measurement rate for the FAST rate is 60ms Sample and the input bandwidth is 60 Hz Every sample is displayed no averaging The rate indicator flashes at a frequency of 2 Hz FAST is good when a rapid measurement response time is required but stability will not be as good as SLOW or MEDIUM Ho
20. gt lt suffix gt Parameters The lt nrf value gt is a floating point number representing the actual known power during the user calibration The lt suffix gt is the power units see Table 3 2 If the suffix is omitted watts is assumed Note This command has the same effect as pressing the CAL SET button during the user calibration Details regarding the user calibration can be found in Chapter 6 of the instruction manual for the optical measurement head The proper test equipment must be in place for this command to work properly Examples CAL POWERSET 3 00 DMB action sets the power in the user calibration to 3 dBm CAL POWERSET 1 00 action sets the power in the user calibration to 1 00 mW OMM 6810B 57 COMMAND REFERENCE Command Paths CAL RECall FRONT PANEL REMOTE The CAL RECall command is used to reset the user calibration to the factory preset values pereo eer Parameters None Note This command has nearly the same effect as pressing the CAL USER button to disable the effects of the user calibration Following a CAL RECall command the calibration values are reset to the factory preset values In contrast the CAL USER command is used to toggle between the user set and factory preset values Instructions for executing and or resetting the user calibration are detailed in Chapter 6 of the instruction manual for the optical measurement head Example CAL RECALL action resets the user ca
21. or decrement the selected digit If no buttons are pressed in three seconds the displayed wavelength will be locked in and the digit will stop flashing Commonly used wavelengths may be stored or retrieved by using the WAVELENGTH BLUE SHIFT STORE A A1 A2 A3 and A4 buttons as described in this chapter iU Jx Lightwave INSTALLATION AND OPERATION Front Panel Controls Wavelength Store Control AVENTI Four unique wavelengths can be stored in the 6810B for ws e 55 recall later This feature is useful to switch quickly between XD GS commonly used wavelengths instead of programming the E xj M wavelength into the 6810B every time it is used Use the gt fo procedure below to save up to four wavelengths Program the desired wavelength into the OMM 6810B using the procedure described in section 2 4 5 8 Press the WAVELENGTH BLUE SHIFT button The LED above the SHIFT button will be illuminated The alternate functions for the WAVELENGTH AUTO LEFT RIGHT UP and DOWN buttons are now utilized Press the WAVELENGTH STORE button The indicator above the WAVELENGTH AUTO button will begin to flash Press one of the four channel buttons 1 2 3 4 The WAVELENGTH SHIFT and STORE indicators extinguish and the wavelength is stored Repeat this procedure to store additional wavelength channels Wavelength Recall Control WAVELENGTH o lt One of the four sav
22. the unit is on but the display is dark press the BRIGHT button once to restore the display Examples BRI 0 action darkens the front panel display BRIGHT 3 action the display intensity is set to the midpoint 01_10 OMM 6810B 55 COMMAND REFERENCE Command Paths BRIght FRONT PANEL REMOTE The BRIght query is used to determine the intensity of the front panel display Parameters None Response response response where the response data is an integer between 0 and 5 Zero being a dark display and five being the brightest display Note If the power to the unit is on but the display is dark press the BRIGHT button once to restore the display Examples BRI response zero the display is dark BRIGHT response five the display intensity is set to maximum 56 OMM 6810B ii ILX Lightwave 01 10 COMMAND REFERENCE Command Paths CAL FRONT PANEL REMOTE The CAL command path is used to access the 6810B s user calibration commands The following commands can be reached by first specifying the CAL command path CAL POWERSET CAL USER CAL RECall CAL WAVESET Note The proper test equipment must be set up in order for these commands to work as designed Calibration is discussed in the instruction manual for each optical measurement head CAL POWERSET FRONT PANEL REMOTE The CAL POWERSET command is used to set the actual power during the 6810B user calibration E white d I space
23. the user calibration CAL USER NONE Controls the user calibration CAL WAVESET 1 Sets the user calibration wavelength COND NONE Returns the condition status register DIS 1 Turns the display on or off ENAB COND 1 Sets the enable register for conditions ENAB COND NONE Returns the value of the condition enable register ENAB EVENT 1 Sets the enable register for events ENAB EVENT NONE Returns the event enable register ERRors NONE Returns errors generated since the last ERR EVEnt NONE Returns the event status register HEAD IDN NONE Returns the head identification string HOLD NONE Returns the hold status POWer NONE Returns the power measurement POWer AUTO 1 Sets the power autoranging mode on or off POWer AUTO NONE Returns the status of power autoranging POWer MODE 2 Sets the power display units POWer MODE NONE Returns the power display units POWer OFFSET 1 Sets the power offset multiplier POWer OFFSET NONE Returns the power offset multiplier 01_10 OMM 6810B 51 52 OMM 6810B 4 COMMAND REFERENCE T OMM 6810B Device Dependent Commands Table 4 1 Device Dependent Commands NAME PARAMETERS FUNCTION POWer REFerence 2 Sets the reference for AP measurements POWer REFerence NONE Returns the power reference level PREselect CHAN 1 Selects one of four preselected wavelengths PREselect CHAN NONE Returns the preselected wavelength channel bei
24. underrange E 711 Error reading calibration data from the optical measurement head E 712 Cannot change update rate while in External Trigger Mode E 713 Measurement head is not compatible with the OMM 6810B E 714 Must be in User Calibration mode before starting a new calibration E 715 Button or GPIB function not used with the measurement head attached E 716 Delta Lambda function not allowed when unit is not measuring wavelength E 717 GPIB not available with this instrument E 720 Invalid internal status reporting error to E 975 Table A 2 Error Message Codes 01 10 OMM 6810B 107 108 OMM 6810B IN ILX Lightwave APPENDIX B QUICK START GUIDE B E mH a li a El El El El E E H E a Li El Ei Installation Ensure the voltage printed on the back panel of the 6810B matches the power line voltage in your area Connect the Optical Measurement Head to the INPUT connector on the rear panel Connect the 6810B to the proper AC power receptacle and press the front panel POWER switch to start the power up sequence To achieve rated stability let the instrument warm up for 1 hour before operating AA warnine To avoid electrical shock hazard connect the instrument to properly earth grounded three prong receptacles only Failure to observe this precaution can result in severe injury or death Power and or Wavelength Measurement The Optical Measurement Head must be connected to the instrument and the multimeter should be zeroed u
25. 048 Not Used 4096 Calculation Error 8192 Hardware Error 16384 Software Error 32768 Checksum Error 6 Input Unstable 32 Head Measures Power 64 Head Measures Lambda 28 Soft Set Lambda The condition enable register can be read by using the ENABle COND query The condition status can be monitored by the COND query f any of the enabled conditions are true bit 1 of the status register will be set to one The enable registers retain their values at power up unless the power on status clear flag is set true See PSC in Chapter 3 ENAB COND 3 action Allows the power overrange and power underrange conditions to set bit 1 in the Status Byte Has special information about the command Examples Shows typical statements using the command Figure 4 1 Command Description Format OMM 6810B 53 54 CAL CLS DLF ESE ESE ESR IDN IST OPC OPC PRE PRE PSC PSC PUD PUD RST SRE SRE STB TST WAI OMM 6810B COMMAND REFERENCE Command Paths root ATTEN CAL ENAB HEAD POWER PRESELECT RANGE WAVE ATTEN BRIGHT BRIGHT POWERSET COND IDN AUTO CHAN AUTO AUTO COND RECALL COND AUTO CHAN AUTO AUTO ERR USER EVE MODE SAVE MODE EVE WAVESET EVE MODE MODE HOLD OFFSET OFFSET POWER OFFSET OFFSET RANGE REF REF RANGE REF REF RATE RATE SECURE TERM TERM TIME TIMER WAVE WAVE ZERO ZERO
26. 0B The following commands can be reached by first specifying the PREselect command path PREselect CHANnel PREselect CHANnel PREselect SAVE 76 OMM 6810B iU J Lightwave 01 10 COMMAND REFERENCE Command Paths PREselect CHANnel FRONT PANEL Parameters Notes Examples REMOTE The PREselect CHANnel command places one of the stored wavelengths onto the wavelength display The lt nrf value gt is an integer value between 1 and 4 representing one of the wavelength preselect channels This command has the same effect as pressing the WAVELENGTH BLUE SHIFT button then one of preselect wavelength channels 41 A2 43 or A4 Sending this command will take the unit out of WAVELENGTH AUTO mode and the pre programmed wavelength will be set on the display The detector responsivity calibration factor for that wavelength will be used for power measurements The preselect wavelength channels can be programmed via the PREselect SAVE command PRE CHAN 2 action places the wavelength stored in Channel 2 onto the wavelength display PRESELECT CHAN 4 action places the wavelength stored in Channel 4 onto the wavelength display OMM 6810B 77 78 OMM 6810B COMMAND REFERENCE Command Paths PREselect CHANnel FRONT PANEL REMOTE The PREselect CHANnel query returns the lambda preselect channel number that is on the wavelength display POO Parameters None Response Notes Exam
27. 1 1987 Meets ANSI IEEE Standard 488 2 1987 SH1 AH1 T6 L4 SR1 RL1 PPO DC1 DTO CO E1 all functions remotely controllable except for power on and the GPIB address Power 50 to 60 Hz 100 V 10 120 V 10 220 V 10 230 240 V 10 Operating Temperature 10 C to 40 C Storage Temperature 40 C to 70 C Humidity lt 85 RH non condensing Overall Dimensions H x W x D 89mm x 217mm x 313mm Weight lt 2 5 kg 5 5 lbs Warm up 1 hour 1 Antistatic covers are included on all connectors These covers should remain in place when the instrument is not in use to prevent a static discharge from damaging the instrument OMM 6810B 5 INTRODUCTION AND SPECIFICATIONS Specifications Our goal is to make the best laser diode instrumentation available anywhere To achieve this we need your ideas and comments on ways we can improve out products We invite you to contact us at any time with your suggestions 6 OMM 6810B IU Jx Lightwave CHAPTER 2 INSTALLATION AND OPERATION 5 B El a ta a El El El Li mH B El E E Ei This chapter describes how to install adjust and operate the OMM 6810B It is divided into five sections covering installation power up front panel and rear panel controls and general operation Appendix B Quick Start is intended for users who wish to begin operation immediately It contains the minimum amount of information req
28. EFERENCE Command Paths WAVE AUTO FRONT PANEL REMOTE The WAVE AUTO query returns the status of the wavelength measurement feature in the OMM 6810B VOD 3G Parameters None Response response data response terminator where the response data is a boolean value representing the status of the wavelength measurement mode 0 not measuring wavelength 1 measuring wavelength Notes This command has the same effect as viewing the WAVELENGTH AUTO indicator on the front panel of the multimeter If the WAVELENGTH AUTO indicator is lit the OMM 6810B is measuring wavelength If the unit is not measuring wavelength the WAVELENGTH AUTO indicator is not lit and the HOLD indicator is lit The wavelength measurement mode can be controlled by issuing the WAVE AUTO command Examples WAVE AUTO response 1 means the unit is measuring wavelength WAVE AUTO response 0 means the unit is not measuring wavelength 90 OMM 6810B iit iLX Lightwave COMMAND REFERENCE Command Paths WAVE MODE FRONT PANEL REMOTE The WAVE MODE command is used to set the units of the front panel wavelength display This command is also used to change the display between absolute and relative wavelength measurements lt white lt string space gt data gt R lt white M strine i space gt data gt Parameters The first string data parameters represents the display scale as shown below NM nanometers CM
29. ET command performs a device reset The Operation Complete Command Idle State OCIS is the state which the 6810B is in when it is no longer waiting for any operation to complete after an OPC command has been executed The Operation Complete Query Idel State OQIS is the state which the 6810B is in when it is no longer waiting for any operation to complete after an OPC query has been executed These idle states allow the 6810B to complete its reset process before continuing with any other commands after the RST is executed Table 3 3 describes the state of the 6810B following the RST command o gu T ABO Ze 01 10 OMM 6810B 39 j GPIB IEEE 488 2 REMOTE OPERATION Common Commands and Queries SRE The SERVICE REQUEST ENABLE command sets the Service Request Enable Register bits to allow the 6810B to generate the user selectable service requests SRQ The Service Request Enable Register is logically ANDed to the Status Byte If the result is non zero then bit 6 of the Status Byte is set to 1 and an SRQ interrupt is initiated ih UN i white integer SA UR fan c SRE 7 space nr gt Pd Parameters where the integer nrf gt is the binary integer sum of the enabled bits in Figure 3 11 Standard Event Summary ESB 1 r MAV Message Available Error Queue Not Empty 1 Oa Not Used Pup presensi Not Used mo EE p oer ae arr a Condition Summary l
30. GPIB connector is located at the top center of the rear panel It meets IEEE 488 1 specifications Interface specifications are listed in Table 3 1 Optical Measurement Head Input Connector All Optical Measurement Heads interface the instrument via the 26 pin high density D connector located on the lower left side of the rear panel Ak WARNING Do not attach or remove Optical Measurement Heads while power is applied to the Multimeter Please turn the power switch off when changing heads Analog Output The POWER ANALOG OUT is a non calibrated analog value between 0 and 10 volts representing the measured power as a percent of full scale power within the selected gain range For example if full scale power for gain range two is 10mW 01 10 OMM 6810B 19 INSTALLATION AND OPERATION General Operating Procedures and the displayed power is 5 000 mW then 5 0 volts is present on the POWER ANALOG OUT connector Should the power analog output appear to jump frequently between minimum and maximum values it is likely that the unit is in AUTO power range mode and the gain range is oscillating between two states Placing the unit in manual mode should alleviate the problem General Operating Procedures The following sections present some guidelines for operation Remote operation is discussed in Chapters 3 and 4 Warm up and Environmental Considerations Operate the OMM 6810B at an ambient temperature between 10 and 40 9C Storage t
31. N ON ON ON ON ATTN OFF NOT USED NOT USED NOT USED NOT USED AUTO WAVE OFF ON ON ON OFF USER CAL OFF OFF OFF OFF OFF ZERO OFF OFF OFF OFF OFF ZOOM OFF OFF OFF OFF OFF BRIGHTNESS BRIGHTEST BRIGHTEST BRIGHTEST BRIGHTEST BRIGHTEST RATE MEDIUM MEDIUM MEDIUM MEDIUM MEDIUM LEFT DISPLAY P lin P lin P lin NOT USED P lin RIGHT DISPLAY A nm A nm A nm A nm A nm Getting Started with GPIB OMM 6810B This secion is intended as a quick guide to the GPIB syntax and commands used by the OMM 6810B The 6810 s unique device dependent commands are described in Chapter 4 Overview of the OMM 6810B Syntax Generally a command or query is entered spelled as shown in Table 4 1 The command query must contain all of the letters which are shown in upper case in Figure 4 2 and Table 4 1 However the command parser is not case sensitive so either upper or lower case may be used in any combination The lower case letters shown with the commands in Section 4 4 are optional letters and may be used for software clarity The commands below are equal Only the first three letters BRI are required while the other letters are optional iU qJx Lightwave GPIB IEEE 488 2 REMOTE OPERATION Getting Started with GPIB BRI 3 BRIGHT 3 and BRight 3 The syntax of the 6810B commands follow the rules laid out in the IEEE 488 2 standard Colons indicate the start of anew command path Semicolons indicate a separation of commands wit
32. ONG 220280 eee erre Tras 800 459 9459 or 406 586 1244 Fak Deb e eee ee ee Ease ta 406 586 9405 On the web at 0 0 2 cee eee ilx custhelp com Or mail to ILX Lightwave Corporation P O Box 6310 Bozeman Montana U S A 59771 www ilxlightwave com When you contact us please have the following information Model Number Serial Number End user Name Company Phone Fax Description of what is connected to the ILX Lightwave instrument Description of the problem If ILX Lightwave determines that a return to the factory is necessary you are issued a Return Authorization RA number Please mark this number on the outside of the shipping box You or your shipping service are responsible for any shipping damage when returning the instrument to ILX Lightwave ILX recommends you insure the shipment If the original shipping container is not available place your instrument OMM 6810B ix L DOT in a container with at least 3 inches 7 5 cm of compressible packaging material on all sides We look forward to serving you even better in the future x OMM 6810B ii ILX Lightwave CHAPTER 1 INTRODUCTION AND SPECIFICATIONS I El mH E El a El El mH El E El H L1 E E E a This manual contains operation and maintenance information for the OMM 6810B Optical Power and Wavelength Meter If you want to get started immediately read Appendix B Quick Start first Chapter 2 co
33. POWER UP or DOWN buttons to change the address The usable range is 0 to 30 iU J x Lightwave GPIB IEEE 488 2 REMOTE OPERATION Preparation for GPIB Control 3 In three seconds the new address is stored and the display returns to standard measurements 01 10 OMM 6810B 23 GPIB IEEE 488 2 REMOTE OPERATION ANSI IEEE 488 2 Definitions ANSI IEEE 488 2 Definitions The following sections contain the relevant definitions for syntax diagrams and syntax elements for the GPIB commands as defined by the IEEE 488 2 standard Syntax Diagrams Syntax diagrams indicate the most complete form of GPIB command construction The terminology shown here and in subsequent sections is used throughout this manual to define the command syntax These syntax diagrams conform to the ANSI IEEE 488 2 1987 standard and the terminology presented here reflects that standard 3 The oval or round shape contains a terminal syntactic element These represent a basic function such as a single ASCII character which cannot be divided Rectangles contain non terminal syntactic elements These represent elements which are expandable to a diagram of terminal syntactic elements However they are presented as a unit for clarity or emphasis Lines and arrows indicate correct paths through the syntax diagram A reverse line around an element indicates that the element may be repated indefinately A forward arrow around an element indicates that the ele
34. RANge AUTO query returns the status of the autoranging mode EOLO Parameters None Response response lt response where the response data is boolean value representing the status of the autoranging mode 0 manual gain ranging mode 1 auto gain ranging mode Notes This command has the same effect as viewing the POWER AUTO indicator on the front panel of the multimeter Auto manual ranging modes have different effects on the front panel power display Autoranging can be controlled by issuing the RANge AUTO command Examples RANGE AUTO response 1 means the unit is autoranging the electrical gain range RAN AUTO response 0 means the unit is in manual gain ranging mode 01_10 OMM 6810B 81 COMMAND REFERENCE Command Paths RATE FRONT PANEL REMOTE The RATE command is used to select one of three measurement update rates white string space data Parameters The string data represents the measurement rate as shown below SLOW MEDIUM MED FAST Notes This command has the same effect as pressing the RATE button to cycle through the three possible update rates The measurement rate is determined by observing the frequency of the blinking rate indicator in the upper left corner of the front panel display The gain range may be queried by issuing the RATE query Examples RATE FAST action sets the unit to the fast measurement rate RATE MED action sets the unit to the
35. See the Table of Contents to locate the specifications and other product information The following classifications are standard across all ILX Lightwave products Indoor use only Ordinary Protection This product is NOT protected against the harmful ingress of moisture Class Equipment grounded type Mains supply voltage fluctuations are not to exceed 10 of the nominal supply voltage Pollution Degree II Installation overvoltage Category II for transient overvoltages Maximum Relative Humidity 8096 RH non condensing Operating temperature range of 0 C to 40 C Storage and transportation temperature of 40 C to 70 C Maximum altitude 3000 m 9843 ft This equipment is suitable for continuous operation Safety Marking Symbols This section provides a description of the safety marking symbols that appear on the instrument These symbols provide information about potentially dangerous situations which can result in death injury or damage to the instrument and other On In position of a bistable push control The slash I only denotes that mains are on Off Out position of a bistable push control The circle O only denotes that mains are off components Caution Earth Alternating Visible and or refer to ground current invisible laser manual Terminal NU radiation Caution risk Protective Caution hot Frame or of electric Conductor surface chassis shock Terminal Terminal or I
36. Table 3 2 If the suffix is omitted watts is assumed Notes The display should be in AP mode before this command is sent Sending the POWer MODE DELTA ON command or pressing the DISPLAY AP button assigns a reference power Use this command to change the reference power while already in the AP mode The power reference point may be queried by sending POWer REFerence Examples POWER REFERENCE 0 DBM action the reference power is set to 0 dBm POW REF 50 NW action the reference power is set to 50 nW 01 10 OMM 6810B 75 COMMAND REFERENCE POWer REFerence FRONT PANEL REMOTE The POWer REFerence query returns a floating point number representing the power reference The reference is returned in the units of the present display Oro Parameters None Response response data gt lt response terminator gt where the response data is a floating point number representing the reference power in the units of the present display mode Notes This command has the same effect as pressing the VIEW REF button The power reference is returned in either watts or dBm depending on the mode of the power display Examples POWER REFERENCE response 3 00 means the power reference level is 3 dBm POW REF response 5 678E 3 means the power reference is 5 678 mW PREselect FRONT PANEL REMOTE The PREselect command path is used to access the four user programmable preselect wavelengths in the OMM 681
37. Te User s Guide 7 Optical Power and Wavelength Meter TUR OMM 6810B 2 m Bie IE E POWER ES a mu BEI S 7 dI LX Lice ocv NS A Newport Corporation Brand ILX Lightwave 31950 Frontage Road Bozeman MT U S A 59715 U S amp Canada 1 800 459 9459 International Inquiries 406 556 2481 Fax 406 586 9405 ilx custhelp com www newport com ilxlightwave 0034103 01 September 2013 TABLE OF CONTENTS I El B m E Bl uH B E Bl E E Es E E a El Safety Information and the Manual llle V General Safety Considerations 0 0 00 cece ees V Safety Marking Symbols lslilseliseeeee ees vi Comments Suggestions and Problems ene eee ix Chapter 1 Introduction and Specifications Product Overview usssssssseeele n 1 Safety Considerations liliis 1 Available Options and Accessories 00 cece eens 3 Specifications ic nad coed eer dase wnt ir dakak nd weed Ped Ree a s 4 Chapter 2 Installation and Operation Installation ee aes ee eine Eee BA ee ee 7 AC Power Considerations 00 000 cece tees 7 Tilt Foot Adjustment iore Ra Pa hee eae RN 7 Rack Mo nllng 2 e tU pen ek ERASE EI sb a ees EE 8 Power Up Sequence susssssessses ren 8 Front Panel Controls 0 000 cece res 9 General Functions 00 cect eee 9 Lett Display cg ee oe de ee eb dace aw eR NE E PU ee ey 9 Right Display 45 i wisi ee Rec
38. Wer MODE query Example POW response 5 7 depending upon the display mode the unit is reading a power of 5 7 dBm 5 7 dB or a linear delta power of 5 7 Watts POWER response 2 3056E 6 depending upon the display mode the unit is reading a power of 2 3056 uW or a linear delta power of 2 30056 uW response terminator gt POWer FRONT PANEL REMOTE The POWer command path is used to access the OMM 6810B s power display and power reference functions The following commands can be reached by first specifying the POWer command path POWer AUTO POWer MODE POWer OFFset POWer REFerence POWer AUTO POWer MODE POWer OFFset POWer REFerence 01_10 OMM 6810B 69 COMMAND REFERENCE Command Paths POWer AUTO FRONT PANEL REMOTE The POWer AUTO command controls the electrical gain autoranging function Parameters The nrf value is a boolean value of 1 or ON to enable autoranging 0 or OFF to disable autoranging Note Thsi command has the same effect as pressing the POWER AUTO button to control the autoranging Auto manual ranging modes have different effects on the front panel power display The status of autoranging may be queried by issuing the POWer AUTO query Example POWER AUTO ON action enables the autoranging function POW AUTO OFF action disables the autoranging function POWer AUTO FRONT PANEL REMOTE The POWer AUTO query returns the status of the autoranging mode
39. ar complete capability DTO Device Trigger no capability CO Controller Function no capability E1 E2 Three state bus drivers with automatic switch to open collector during parallel poll Other GPIB features include Aconcise and straight forward command set Full serial poll capability with SRQ Fulllocal remote capability including LOCAL LOCKOUT This chapter is a guide to the syntax and usage of the various IEEE 488 2 common commands It also includes advanced programming tips for remote use with the 6810B device dependent commands hardware diagrams and other information relating to remote operation II LX Lightwave OMM 6810B 21 22 a GPIB IEEE 488 2 REMOTE OPERATION Preparation for GPIB Control This chapter is divided into three parts The first part contains information for getting started using GPIB It also contains the syntax for each 488 2 common command which is supported by the 6810B The second part contains information on status reporting and advanced programming techniques The third part contains information on remote interface messages which are generally transparent to the user Preparation for GPIB Control OMM 6810B To use the OMM 6810B remotely an IEEE 488 interface adapter is required in your host computer These adapters and support software are available from several manufacturers and can be installed in most computers Appendix C describes how to
40. avelength measurements WAVE OFF 5 0 action five nanometers will be subtracted from future wavelength measurements 01 10 OMM 6810B 93 COMMAND REFERENCE WAVE OFFset FRONT PANEL REMOTE The WAVE OFFset query returns the value of the Wavelength User Calibration offset value This is a number that is added to wavelength measurements PO s S CO ns Parameters None Response response data response terminator where the response data is a floating point number representing the wavelength user calibration factor Notes This is a GPIB command only The offset is entered via the WAVE OFFset command or by executing the user calibration as described in Chapter 6 of the optical measurement head instruction manual The wavelength offset is a number that is added to future wavelength measurements as shown below A corrected A uncorrected cal factor Examples WAVE OFFSET response 0 5 depending upon the present wavelength display mode either 0 5 nm or 0 5 wavenumbers is added to the wavelength measurement WAVE OFF response 2 0 depending upon the present wavelength display mode either 2 0 nm or 2 0 wavenumbers is subtracted from the wavelength measurement 94 OMM 6810B IU Jx Lightwave COMMAND REFERENCE Command Paths WAVE REFerence FRONT PANEL REMOTE The WAVE REFerence command is used to set the wavelength reference point for future delta wavelength measurements s
41. buttons are multifunctional The d functions are listed below Manually changing the electrical gain range Setting the GPIB address Setting the power during the User Calibration Wavelength Automatic Manual Control Press the WAVELENGTH AUTO button to toggle the instrument between automatic wavelength measurements and manual wavelength settings If the LED above the WAVELENGTH AUTO l button is illuminated the instrument is measuring the wavelength of AUT the source and automatically setting the correct detector ae responsivity for power measurements The WAVELENGTH AUTO mode is locked out on power only measurement heads If the LED above the WAVELENGTH AUTO button is not illuminated the instrument is in manual wavelength mode where the WAVELENGTH LEFT RIGHT UP and DOWN arrow buttons are used to manually set the wavelength of the source being measured Setting the Wavelength aoe In manual wavelength mode it is important to program the mo lt c 6810B with the wavelength of the laser being measured so REA AT the correct calibration factors are used to compute power M ON Use the following procedure to set the wavelength via the 9 LS front panel Use the LEFT and RIGHT arrow buttons to select the digit on the WAVELENGTH display that will be controlled by the WAVELENGTH UP and DOWN arrow buttons The selected digit will flash Use the WAVELENGTH UP and DOWN arrow buttons to increment
42. ck program data is the PUD command PROGRAM DATA SEPARATORS gt When there is a list of lt PROGRAM DATA UNITS parameters following a PROGRAM HEADER SEPARATOR white space the lt PROGRAM DATA UNITS gt must be separated with a PROGRAM UNIT SEPARATORs gt Figure 3 8 shows a syntax diagram for a PROGRAM UNIT SEPARATOR3 gt NC whitespace Tul gt white space Figure 3 8 PROGRAM DATA SEPARATOR Syntax Diagram Power On Conditions At power on the 6810B complies with the ANSI IEEE Std 488 2 1987 requirements It initializes the device parameters to be the same as when the power was last shut down However the delta power delta lambda zoom and zero modes are always be disabled at power up The unit default conditions may 01 10 OMM 6810B 29 30 a GPIB IEEE 488 2 REMOTE OPERATION _ Getting Started with GPIB be recalled by using the RST command Default conditions are outlined later in this chapter Default Parameters Except for suffixes there are no default values for omitted parameters If a command is expecting a parameter and none is entered an error is generated If a suffix is omitted the default suffix is assumed If a reset is performed via a RST command the instrument is configured as shown in Table 3 3 Table 3 3 State of the OMM 6810B after RST OMH 670xB OMH 671xB OMH 672xB OMH 673xB OMH 675xB POWER AUTO O
43. ck that the GPIB address is set properly and the controlling software is sending commands to the proper address Make sure no two devices have the same GPIB address e Check that there are fewer than 15 devices on the bus and there is less than 20 meters of total cable Check that the GPIB controller card in the host computer is configured properly See Appendix C Try isolating the 6810B by removing all other instruments from the bus Slow or unexpected response to GPIB Make sure no two devices have the same GPIB commands address Check that there are fewer than 15 devices on the bus and there is less than 20 meters of total cable Make sure the GPIB controller card in the host computer is configured properly See Appendix C Isolate the 6810B by removing all other instruments from the bus Device does not respond to command remote Read the error queue remotely Err The command light is on syntax or command structure may be in error Read the status byte STB and condition register COND for possible device problems Make sure the GPIB controller card in the host computer is configured properly See Appendix C Bus hangs Place a software timeout around the command in question to prevent the hang Check the syntax of the command that is causing the hangup Make sure the controlling software is not requesting information from the 6810B without first sending a query Make
44. configure many of these interface adapters for use with the 6810B This Chapter and Chapter 4 assume that you have a basic knowledge of the IEEE 488 interface bus and how to use it for instrument control You should also be familiar with front panel operation of the OMM 6810B Manual operation is detailed in Chapter 2 GPIB Control Sending any command over the GPIB bus automatically puts the instrument in REMOTE mode The REMOTE indicator identifies when the instrument is in remote operation mode When the instrument is in REMOTE mode pressing the LOCAL switch returns the instrument to IOCAL control mode unless a Local Lockout state has been activated by the low level GPIB command LLO from the host computer Local Lockout disables all LDC 3900 front panel switches until this condition is changed by the host computer In this condition the REMOTE indicator will flash at a 1 Hz rate For more information on low level interface commands such as LLO refer to the IEEE488 1 specification GPIB Address The talk and listen addresses on the OMM 6810B are identical When the unit is in LOCAL mode pressing the LOCAL button causes the GPIB address to be displayed Extended GPIB addressing is not implemented in the 6810B Use the following procedure to change the GPIB address 1 Press and release the LOCAL button If the current GPIB address is not on the left display press and release LOCAL again 2 While the GPIB address is displayed press the
45. d to 9096 of the original power measurement 01 10 OMM 6810B 73 COMMAND REFERENCE Command Paths POWer OFFset FRONT PANEL REMOTE The POWer OFFset query returns the value of the power user calibration offset value This number is a multiplication factor that is applied to power measurements POP LOL LO Parameters None Response response data response terminator where the response data is a floating point number representing the power user calibration factor Notes This is a GPIB command only The offset is entered via the POWer OFFset command or by executing the user calibration as described in Chapter 6 of the optical measurement head s instruction manual The power offset is a multiplication factor that is applied to future power measurements as shown below Power corrected Power uncorrected x cal factor Examples POW OFFSET response 0 5 the corrected power is one half of the original measured power POWER OFF response 2 0 the corrected power is double the original measured power 74 OMM 6810B ii ILX Lightwave COMMAND REFERENCE Command Paths POWer REFerence FRONT PANEL REMOTE The POWer REFerence command is used to set the power reference point for future relative power measurements suffix space gt Parameters The lt nrf gt parameter is a floating point number representing the reference power The lt suffix gt is an approved power suffix as shown in
46. d type for easy identification Each function is described below General Functions The POWER switch is used to supply AC Power to the 6810B At power up the instrument is configured to the same state that was present when the power was last turned off Immediately after power up the personality and calibration data is downloaded from the measurement head The ZERO AP AX and ZOOM functions are always disabled at power up AA warnine Do not attach or remove optical measurement heads while power is applied to the multimeter Please turn the power switch when changing heads MOLE lt Licfibtiwenze owM 6810B OPTICAL MULTIMETER DISPLAYL A T i A u W N dBm cm j rq Tm mm mmn 7 rJ r17 IN 17 7n i LOG LIN nm cm HOOD AP HOOOO m 4 Se ee nW dB AX AP AX purrrpurrrrprrrr HOLD GPIB f POWER ane WAVELENGTH 1 CAL ES VIEW REF BRIGHT i d auro ATTN l AUTO l a gt USER RATE ZOOM POWER RENGE SIORA A1 A2 l EN RANGE A3 xd it 2 L E E E ee Figure 2 1 OMM 6810B Front Panel Left Display The left display consists of six d
47. dulation This condition may occur if the laser has not warmed up Most gas laser cavities expand when first turned on This expansion can cause intensity fluctuations which the 6810B interprets as an unstable laser The most stable readings are provided when the 6810B is in the slow update rate Check for tight connections between the instrument and the measurement head and ensure other noisy electronic devices are not located near the head In cases of low input power and high background light try working in a dark environment and be sure to zero the instrument as described in Chapter 2 Display shows A measurement probe or head is not connected to the multimeter I ILX Lightwave OMM 6810B 101 TROUBLESHOOTING Hardware Troubleshooting Guide Symptom Corrective Action Display shows HI This condition will only occur with wavelength measurement heads when the measured wavelength is greater than the specified maximum wavelength for that head Display shows LO A e This condition will only occur with wavelength measurement heads when the measured wavelength is less than the specified minimum wavelength for that head Display shows OL This condition occurs when the laser s input power exceeds the maximum allowed for the selected gain range Measurements at this level are invalid If in manual mode press the POWER DOWN switch to select the next lower gain range If in auto
48. e Dependent Commands 0005 51 Command Paths ssessesee en 53 OMM 6810B Device Command Reference llslslulsu 55 Error Messages sisscrariniinsikesi Kan AERES eh beta Re ERR 98 Programming Examples 0 0 e eee eee 98 Chapter5 Maintenance Calibration Overview 0000 c cee ee 99 Recommended Equipment 0 00 e cece teas 99 ludo pe 99 Resetting the Factory Calibration lsllsllslle else 100 Line Voltage Selection Lusulselsels elles lees 100 Chapter 6 Troubleshooting Hardware Troubleshooting Guide uusulsels else 101 GPIB Troubleshooting Guide 0 00 eee eee 103 Appendix A Error Messages Error Messages ra ena e e a a 108 Appendix B Quick Start Guide Installation e emu errena aia ve wma iE EU 109 Power and or Wavelength Measurement 109 More Information our rem bs toes ed be vee ade ed 113 OMM 6810B INILX Lightwave SAFETY AND WARRANTY INFORMATION The Safety and Warranty Information section provides details about cautionary symbols used in the manual safety markings used on the instrument and information about the Warranty including Customer Service contact information Safety Information and the Manual Throughout this manual you will see the words Caution and Warning indicating potentially dangerous or hazardous situation
49. e ENABIe EVEnt command The condition status can be monitored by the EVEnt command Example ENAB EVE response 12 means the wavelength overrange and underrange events are allowed to be summarized in the status byte iU Jx Lightwave COMMAND REFERENCE Command Paths ERRors FRONT PANEL REMOTE The ERRors query returns a list of command execution and device errors which have occurred since the last ERRors query or CLS command These errors are indicated by a number which corresponds to the type of error which occurred These numbers are decoded in Appendix A Parameters None Response response data response terminator which each response data consists of an error code value Notes The response data is a list of the current error codes represented by numbers and separated by commas A response of zero indicates that there are no errors to report The response is sent as character data When the error queue is active errors exist bit 7 in the status byte is set to one Examples ERR response 0 means there are no errors to report ERRORS response 707 means the input power is overrange 01 10 OMM 6810B 65 COMMAND REFERENCE Command Paths EVEnt FRONT PANEL REMOTE The EVEnt query returns the value of the OMM 6810B status register Oper Parameters None Response response data gt lt response terminator gt where the response data is the bina
50. e present electrical gain range setting Parameters None Response response data response terminator where the response data is an integer between 0 and 7 representing the present electrical gain range setting Notes This command returns the gain range without changing the status of autoranging The gain range is set via the RANge command Examples RANGE response 0 means the current gain range is 0 lowest gain RAN response 5 means the curreng gain range is 5 RANge FRONT PANEL REMOTE The RANge command path is used to access the multimeter s power autoranging commands The following commands can be reached by first specifying the RANge command path RANge AUTO RANge AUTO 80 OMM 6810B I ILX Lightwave COMMAND REFERENCE Command Paths RANge AUTO FRONT PANEL REMOTE The RANge AUTO command controls the electrical gain autoranging function Parameters The nrf value is a boolean value of 1 or ON to enable autoranging 0 or OFF to disable autoranging Notes This command has the same effect as pressing the POWER AUTO button to control the autoranging Auto manual ranging modes have different effects on the front panel power display The status of autoranging may be queried by issuing the RANge AUTO query Examples RANGE AUTO ON action enables the autoranging function RAN AUTO OFF action disables the autoranging function RANge AUTO FRONT PANEL REMOTE The
51. ed wavelength channels can be recalled STOREA AT Xi to the front panel wavelength display using the following As aa instructions This feature is useful to switch quickly between C 4 commonly used wavelengths Press the WAVELENGTH BLUE SHIFT button The LED above the SHIFT button will be illuminated The alternate functions for the WAVELENGTH AUTO LEFT RIGHT UP and DOWN buttons are now utilized Press one of the four channel buttons X1 A2 A3 24 to recall the desired wavelength to the front panel The unit remains in the SHIFT mode the WAVELENGTH SHIFT indicator remains on to allow rapid switching between wavelengths by simply pressing one of the channel buttons 11 A2 A3 A4 Press the WAVELENGTH BLUE SHIFT button to exit the SHIFT mode 01 10 OMM 6810B 13 INSTALLATION AND OPERATION Front Panel Controls 13 m The WAVELENGTH UP DOWN LEFT and RIGHT arrow buttons are multifunctional The functions are listed below along with reference paragraphs for each Li Lo Changing the wavelength setting for power calibration Setting the wavelength in the User Calibration Storing or retrieving up to four selectable wavelengths User Calibration It is possible to calibrate the OMM 6810B with any Optical CAL Measurement Head using a laser source of known wavelength and or power Pressing the CAL USER button toggles the instrument in and out of the Us
52. ely by the 6810B Status Reporting The status of the OMM 6810B is held within four internal registers Figure 3 12 illustrates the structure of each register Each is now described Condition The Condition Register monitors the state of the device For example if the input power is overloading the Measurement Head bit 0 in the Condition Register is set Refer the COND query in Chapter 4 Event The Event Register watches for changes in the device condition For example if the input source is unstable bit 4 in the Event Register is set Refer the EVENT query in Chapter 4 Standard Event The Standard Event Register is defined by the IEEE 488 2 standard and is responsible for monitoring GPIB events such as Operation Complete and Command Errors Refer the ESR query Status Byte The Status Byte is also defined by the IEEE 488 2 standard The status byte contains the summary of the other registers as well as reporting if the error and message available queues are active Refer the STB query Each register has an ENABLE register associated with it The enable register works like a mask or filter when updating that register s summary to the Status Byte For example the Condition Register is filtered logically ANDed with the Condition ENABLE Register If the result is non zero then Bit 1 in the Status Byte is set to one The Enable registers are set via unique GPIB commands Figure 3 12 illustrates the status reporting scheme of the
53. emperatures should be between 40 to 70 C To achieve rated stability let the OMM 6810B warm up for at least 1 hour before use Other Considerations The OMM 6810B is designed to provide the user with a simple operating format The Measurement Head being used must be connected to the instrument and the device should be zeroed under nominal test conditions The beam of the source should be directed perpendicular to the face of the OMH and directly into its aperture Be sure the entrance angle does not exceed the specified 45 from perpendicular Be aware that certain lasers emit an amount of non lasing radiation This radiation can cause an erroneous measurement if the source is placed too close to the Optical Measurement Head 20 OMM 6810B iU Jx Lightwave CHAPTER PIB IEEE 488 2 REMOTE OPERATI El ON When the 6810B is connected to a host computer the instrument can be controlled remotely via an IEEE488 GPIB bus The OMM 6810B with the optional model 1268 complies with the IEEE 488 2 1987 standard to the extent shown in Table 3 1 Table 3 1 IEEE 488 Interface Specification SH1 Source Handshake complete compatibility AH1 Acceptor Handshake complete capability T6 Talker Functions L4 Listener Functions SR1 Service Request complete capability RL1 Remote Local Function complete capability PPO Remote Configuration Parallel Poll no capability DC1 Device Cle
54. en power levels are low The procedure for zeroing the instrument is described below The beam from the optical source should be blocked at the source or turned off Note If a beam stop is used it should be positioned as close to the source as possible to allow the maximum collection of background noise If the entry aperture to the ILX Optical Measurement Head is blocked instead the zeroing function will not work properly This is especially true for low power applications or in areas of high background light Ifthe LED above the DISPLAY ZERO button is illuminated press the ZERO button once to disable the existing compensation factors Press the DISPLAY ZERO button While zeroing the 0 digit walks across both displays and the zero indicator flashes When zeroing is complete the ZERO indicator is illuminated The process takes about 15 seconds Allow the optical source to enter the aperture of the head Accurate power and or wavelength measurements should be displayed Note If the ambient environmental conditions change e g the room lights are turned on or off the 6810B must be re zeroed to maintain its accuracy Pressing the DISPLAY ZERO button again disables the compensating factors and the ZERO indicator is turned off Power Display Units The DISPLAY LOG LIN button toggles the optical power display between linear units pW nW uW mW W or LOG LIN logarithmic units dBm If the instrument is in power autorangi
55. er 3 iit iLX Lightwave OMM 6810B 49 COMMAND REFERENCE Terminology The GPIB command set is designed to be intuitive yet create a simple GPIB software development environment In most cases commands can be abbreviated In this chapter the required letters for each command are shown in capital letters Optional letters are shown in lower case and may be used to improve software readability Commands and Queries There are two types of device communication commands which tell the device to do something and do not return anything and queries which return a stored value or instrument state but do not change the device state Queries must be terminated with a question mark while commands may require one or more parameters to follow Command BRIGHT 5 display brightness to maximum Query BRIGHT returns the display brightness level Substitute Parameter Names For clarity in programming the Boolean values of one and zero may be represented by the appropriate substitute parameter names see Table 3 4 For instance the following commands are identical RANGE AUTO 1 RANGE AUTO ON RANGE AUTO TRUE Compound Command Structure Many 6810B GPIB commands require a compound structure This is done to distinguish between different commands of the same type The compound command structure is similar to a directory path structure as found in DOS For example commands which deal with the 6810B s p
56. er Calibration mode When the LED above the CAL USER button is illuminated the instrument employs the user defined calibration which has been stored in the Optical Measurement Head Pressing the CAL USER button when SET the CAL USER LED is on causes the instrument to revert to factory calibration Pressing the CAL SET button while the LED above the CAL USER button is on initiates a user calibration procedure The POWER UP and DOWN buttons and the WAVELENGTH LEFT RIGHT UP and DOWN buttons are used in connection with the CAL USER and SET buttons during a user calibration procedure The calibration procedure is described in Chapter 6 of the Instruction Manual for each optical measurement head 14 OMM 6810B IN ILX Lightwave INSTALLATION AND OPERATION Front Panel Controls Zeroing The ZERO function is used to remove the effects that ambient light has on the power and or wavelength measurement Pressing the DISPLAY ZERO button when the LED above the DISPLAY ZERO button is not on starts the zeroing process While zeroing the 0 digit walks across both displays and the LED above the ZERO button flashes The LED above the DISPLAY ZERO button remains on after the zeroing process is completed Pressing DISPLAY ZERO when the LED above the button is illuminated disables the effects of the zero The 6810B and Optical Measurement Head should always be zeroed Best results are obtained in a dark environment especially wh
57. ere the integer nrf gt is the binary integer sum of the enabled bits in Figure 3 9 The value must be between 0 and 255 34 OMM 6810B IU Jx Lightwave GPIB IEEE 488 2 REMOTE OPERATION Common Commands and Queries ESE The STANDARD EVENT ENABLE REGISTER QUERY allows the user to determine which status bits can set the summary bit bit 5 in the Status Byte The response is the sum of the neabled bits presented in Figure 3 9 X o X J 3 ESE X gt Standard Event Status Register Logical OR Standard Event Status Enable Register Figure 3 9 Standard Event Status Register Standard Event Status Enable Register Bit Reference 0 Operation Complete 1 N A 2 Query Error 3 Device Dependent Error 4 Execution Error 5 Command Error 6 N A 7 Power On ESR This query causes the device to return the value of the STANDARD EVENT REGISTER The vlue of the response is the binary integer sum of the bits presented in Figure 3 9 x gt F A E j ESR AN 7 Response Binary Integer Sum between 0 and 255 See Figure 3 9 01_10 OMM 6810B 35 GPIB IEEE 488 2 REMOTE OPERATION Common Commands and Queries IDN Response This query causes the 6810B to return the DEVICE INDENTIFICATION string The string is 35 bytes long and is in the form described below N S N 097763 DN 4 gt ILX Lightwave OMM 6810B nnnnnnnn vv where n unit serial nu
58. esponse 97 means the power is overranged the head measures power and wavelength ENABl1le REMOTE The ENABle command path is used to access the 6810B s status enable commands The following commands can be reached by first specifying the ENABle command path ENABle COND ENABle EVEnt ENABle COND ENABle EVEnt iU Jx Lightwave COMMAND REFERENCE Command Paths ENABle COND FRONT PANEL REMOTE The ENABle COND command sets the condition status enable register This register is a filter which is logically ANDed to the condition register If the result is non zero bit 1 in the status byte is set i lt white cu space gt Parameters The lt nrf value whose sum represents the enabled bits below 1 Power Overrange 256 Measuring the Wavelength 2 Power Underrange 512 Unit is Zeroed 4 Wavelength Overrange 1024 Attenuator Activated 8 Wavelength Underrange 2048 User Calibration Activated 16 Input Unstable 4096 Calculation Error 32 Head Measures Power 8192 Hardware Error 64 Head Measures Wavelength 16384 Software Error 128 Holding the Measurement 32768 Checksum Error Note The condition enable register can be read using the ENABle COND query The condition status register can be monitored using the COND query If any of the enabled bits in the condition register are true bit 1 of the status byte is set The enable registers retain their values at power up unless the power on
59. ge E 202 PROGRAM DATA will not convert to a valid type E 203 Security violation command is not available without clearance E 204 PROGRAM DATA suffix type is not valid E 205 PROGRAM DATA is not boolean value or word E 206 PROGRAM DATA will not convert to a signed 16 bit value E 207 PROGRAM DATA will not convert to an unsigned 16 bit value E 208 PROGRAM DATA will not convert to a signed 32 bit value E 209 PROGRAM DATA will not convert to an unsigned 32 bit value iU Jx Lightwave Error Code Explanation E 210 PROGRAM DATA will not convert to a floating point value E 211 PROGRAM DATA will not convert to a character value E 212 PROGRAM DATA will not convert to a byte array pointer E 213 PROGRAM DATA is incorrect block data length E 214 PROGRAM DATA length exceeds maximum E 301 A RESPONSE MESSAGE was ready but controller failed to read it query error E 302 Device was addressed to talk but the controller failed to read all of the lt RESPONSE MESSAGE E 704 Illegal preselect wavelength channel selected 1 through 4 valid E 705 Can t enter a power offset calibration value of zero E 706 Auto calibration cycle aborted E 707 Input power is overrange for the selected gain range E 708 Inputer power is underrange for the selected gain range E 709 Wavelength is overrange E 710 Wavelength is
60. ge of the various device dependent commands for the OMM 6810B It contains a reference for all of the device dependent commands including those which may only be accessed remotely Therefore it is of primary interest to users who wish to utilize the GPIB option This chapter is divided into two parts The first part contains an overview of the remote commands and syntax used by the 6810B The second part contains all of the 6810B commands in alphabetical order Figure 4 1 shows the format for the command descriptions in this chapter The commands which emulate local front panel operation are denoted by the check next to the Front Panel label in the upper left corner of the command description The error messages which may be displayed on the 6810B front panel are listed in Appendix A A short BASIC program example for remote operation of the 6810B is given at the end of this chapter Terminology Terminology required to successfully communicate with the OMM 6810B via GPIB is described in Chapter 3 lt white space gt refers to ASCII characters Such as space bar which are used as separators in the command syntax lt nrf value gt refers to the IEEE 488 2 standard for numeric format notation It is a generic label which means either integer floating point or scientific notation number representation lt suffix gt refers to the IEEE 488 2 standard for suffixes Legal suffixes used to command the OMM 6810B are described in Chapt
61. gin by using the full path notation Once familiar with the paths shortcuts are available These shortcuts are described in Chapter 3 Command Path Name Required letters are shown in upper case lower case letters are optional Front Panel Remote Execution A check mark means the command can be executed in that mode Command mnemonics in front panel local mode may vary W Front Panel WB Remote Command Description to one Lu APPLICABLE OMH S All Applicable OMH s The measurement heads SYNTAX DIAGRAM that apply to this command AA NC H ENS 7 Syntax Diagram For Remote Commands Parameters p Tells what parameters are expected and their type PARAMETERS An nrfvalue refers to a flexible numeric notation IEEE 488 2 Integer exponential or floating point may be used with the decimal radix Alternate radices may be selected in remote operation POINTS OF INTEREST EXAMPLES Points of Interest The ENABIe COND command sets the Condition Enable Register This register is a filter which is logically ANDed to the condi See COND If the result is non zero bit 1 in the Status Byte is set o gt ENAB 7 ENABle COND ion register COND gt An lt nrf value gt whose sum represents the enabled bits below Power Overrange 256 Hard Set Lambda 2 Power Underrange 512 Unit is zeroed 4 Wavelength Overscale 1024 Not Used 8 Wavelength Underscale 2
62. gt lt END gt 0 is the default type This does not truly comply with the IEEE 488 2 spec However the lt CR gt character is ignored treated as a white space so this terminator may be used with other IEEE 488 2 compliant instruments Setting the terminator to anything other than number 4 lt NL gt lt END gt puts the OMM 6810B out of compliance with the IEEE 488 2 spec The other options are provided to allow compatibility with GPIB drivers which do not meet the IEEE 488 2 standard Use of terminator number 3 is especially risky with other devices which comply with the IEEE 488 2 specification This is because the lt CR gt character is ignored treated as a white space Therefore if number 3 terminator is used other IEEE 488 2 devices may wait indefinately for a message termination and hang the bus Examples TERM 5 action the NL new line terminator is selected The OMM 6810B terminates messages with the NL character 01 10 OMM 6810B 83 84 OMM 6810B COMMAND REFERENCE Command Paths TERM Parameters Response Notes Example FRONT PANEI REMOTE The TERM query allows the programmer to determine which program message terminator is currently selected CR carriage return lt CR gt lt NL gt new line CR END EOI lt CR gt lt NL gt lt END gt lt NL gt lt END gt NL and END are allowed response data where the response data is response
63. h measurement in the OMM 6810B response data where the response data is an integer value as shown 0 unit is currently making stable wavelength measurements 1 unit is currently holding the wavelength measurement because the input signal is too unstable to accurately measure the wavelength wavelength measurements will return when the input source is stable again 2 unit is not measuring wavelength either the WAVELENGTH AUTO measure has been disabled by the user or the measurement head is not capable of wavelength measurement This command can be used to determine the state of the wavelength measurement feature in the OMM 6810B This query is the same as viewing the HOLD indicator on the front panel HOLD response 1 means the unit is holding a wavelength but will return to wavelength measurements when the input becomes stable response terminator iU Jx Lightwave COMMAND REFERENCE Command Paths POWer FRONT PANEL REMOTE The POWer query returns the measured optical power in the units of the current display POP eon C Parameters None Response response data gt where the response data is a floating point number representing the measured optical power in the units of the present display mode Note The response data is in linear Watts or logarithmic dBm format Delta Power is presented in linear Watts or decibel dB form Units of the present display are determined by the PO
64. he 6810B be electrically recalibrated every year to maintain accuracy over the entire dynamic range Calibration services are available through ILX Lightwave The User Calibration is unique to each measurement probe or head The Calibration procedure is described in Chapter 6 of the instruction manual for the optical measurement head Recommended Equipment The equipment needed for calibration is dependent upon the type of head being used with the 6810B For heads requiring wavelength calibration gas line sources such as HeNe at 632 8 nm or spectral lamps with the proper line isolation filters work well For power calibration a stable source with a known wavelength is required If a laser diode is used the wavelength must be stable as changes in wavelength will effect the power calibration For calibration of a thermal head wavelength accuracy and stability is not as important as the response is relatively flat over the entire wavelength range Warm up The OMM 6810B with Optical Measurement Head attached should be allowed to warm up for at least 1 hour before calibration uU mILx Lightwave OMM 6810B 99 p MAINTENANCE TER D Resetting the Factory Calibration Resetting the Factory Calibration When the LED above the CAL USER button is lighted the unit is in the User Calibration mode The factory preset calibration can be restored by pressing the CAL USER button or by issuing the CAL USER OFF command via GPIB Refer to Chapter
65. he proper command by following a path from the root node This is similar to determining a path for a file by starting with the root directory and listing the intermediate subdirectories The syntax for a compound command program header is shown in Figure 3 5 The syntax diagram for a compound query program header is shown in Figure 3 6 program program N os No NAN C Z7 f 74 mnemonics 7 US mnemonics wr N Figure 3 5 lt compound command program header gt Syntax Diagram 01_10 OMM 6810B 27 GPIB IEEE 488 2 REMOTE OPERATION ANSI IEEE 488 2 Definitions lt lt lt Program N lt program NA 7 7 6 4 mnemonic gt mnemonic Figure 3 6 compound query program header Syntax Diagram A program mnemonic gt is a command or command path identifier For example the PROGRAM MESSAGE gt ENABLE COND consists of the command COND and the path identifier ENABLE All of the legal compound command program headers may be traced by starting from the root node of the command structure and moving down by levels to paths and finally to the command A PROGRAM MESSAGE TERMINATOR causes the next command search to begin at the root node A leading colon on a PROGRAM MESSAGE UNIT gt causes the instrument to begin searching for the command at the root node Otherwise after a semicolon the instrument first searches the most recently used node for the command I
66. hin a string A leading semicolon may be used to return the 6810B command parser to the command path root Spaces may be placed anywhere in a command string after the command header or query question mark and must be used to separate the command header from the first parameter or program data The following examples show valid syntax for commands with the 6810B WAVE MODE NM WAVE BRIGHT 2 RANGE AUTO ON enable event 255 IDN Below are examples of invalid syntax These command strings would produce an error as explained WAVE MODE CM Missing colon between program headers WAVE MODE CM RANGE 2 WAVE Missing semicolon between commands RANGE 2 WAVE BRIGHT Space not allowed before question mark BRIGHT PWR Letters must be in the correct order POW or POWER Using Commands with Parameters Some commands expect a parameter For example to change the gain range the command would be RANGE 3 This would set the 6810B s electrical gain to range three If a single parameter is expected it should follow the command with one space between the command and the parameter Substitute Parameter Names For clarity in programming the Boolean values of one and zero may also be represented by the appropriate substitute parameter names as shown in Table 3 4 01 10 OMM 6810B 31 Po GPIB IEEE 488 2 REMOTE OPERATION Getting Started with GPIB Table 3 4 Substitute Parameter Names
67. igits used to display power measurements The power may be displayed in linear units pW nW uW mW W or logarithmic units dBm Relative power measurements may also be shown on the left display in linear AP or log dB formats 01_10 OMM 6810B 9 INSTALLATION AND OPERATION Front Panel Controls Right Display The right display consists of five digits used to display wavelength The wavelength may be displayed in nanometers nm or wavenumbers cm Relative wavelength Ai may be shown on the right display in either units When a measurement head is attached that only measures power the right display is frozen with the wavelength used to determine detector responsivity Bargraph The bargraph consists of 16 LED indicators each representing 7 of the full scale power within the selected gain range The indicators on the end of the bargraph are always illuminated to provide 0 and 100 reference points The ZOOM button forces the bargraph into a mode that is ten times more sensitive In zoom mode the end points of the bargraph flash Buttons Indicators Each of the front panel functions is now described in detail The OMM 6810B forms a basis for different optical measurements depending on which Optical Measurement Head is attached Functions may change form slightly or be disabled depending upon which measurement head is attached to the instrument If a disabled button is pressed E 715 will appear on the right display The ke
68. interrupts to be asserted after power on PSC The POWER ON STATUS CLEAR QUERY allows the programmer to query the 6810B s power on status clear flag Response 0 The Standard Event Status Register ESE Service Request Enable Register SRE Event Status Enable Register ENAB EVE Condition Status Enable Register ENAB COND and the Parallel Poll Enable Register PRE retain their values when power is cycled to the 6810B 1 The registers listed above are cleared set to zero when the 6810B power is cycled 38 OMM 6810B iit iLX Lightwave GPIB IEEE 488 2 REMOTE OPERATION Common Commands and Queries PUD The PROTECTED USER DATA command stores data unique to the 6810B such as calibration date and serial number The PUD data is entered by the factory and is protected from change by the SECURE command The arbitrary block program data is 25 bytes long a S lt arbitrary N i PUD lt white block VV space program data PUD The PROTECTED USER DATA QUERY allows the user to retrieve the contents of the PUD storage area The response is the contents of the unique data which was last entered Y Response The factory set response to the PUD is 221nnnnnnnnvvgrMMDDYYABC where n unit serial number v firmware revision number gr GPIB enabled RS232 enabled MMDDYY date of factory calibration ABC intials of calibrating technician RST The RES
69. l OR aed Parallel Poll Enable Register IST TRUE 0 Event Summary 4 Message Available 8 N A 12 N A 1 Condition Summary 5 Event Status Summary 9 N A 13 N A 2 N A 6 Master Status Summary 10 N A 14 N A 3 N A 7 Error Message Available 11 N A 15 N A Figure 3 10 Parallel Poll Response Handling Data Structure 01_10 OMM 6810B 37 j GPIB IEEE 488 2 REMOTE OPERATION Common Commands and Queries PRE This query allows the programmer to determine the contents of the PARALLEL POLL ENABLE REGISTER The response is the sum of the register bits presented in Figure 3 10 ES ru gt PRE A y PA Response Binary Integer Sum of enabled bits in Figure 3 10 It will be between 0 and 65535 PSC The POWER ON STATUS CLEAR command controls the automatic power on clearng of the Service Enable Register SRE Standard Event Status Enable Register ESE Event Status Enable Register ENAB EVE Condition Status Enable Register ENAB COND and Parallel Poll Enable Register PRE This may be used to avoid undesirable service requests when the device is powered up Z ff 3 j white integer 7 AN PSC space nrf gt 7 M Y where the integer nrf gt is a boolean value 0 Power on status clear flag is set false therefore allowing SRQ interrupts after power on 1 Power on status clear flag is set true therefore clearning all enable registers and disallowing SRQ
70. ld Indicator The HOLD light indicates that the light input to the Optical Measurement Head is varying by greater than 1 nm between measurements In this condition the HOLD indicator blinks slowly and the 6810B holds the last stable measurement on the display and uses that wavelength to calculate power The wavelength is held until a stable wavelength is measured In manual wavelength mode the 6810B is not measuring wavelength In this case the last measured wavelength or user selected wavelength is frozen on the display and the HOLD indicator is solidly illuminated Error Display Execution errors are indicated on either display Errors are shown as E xxx where xxx is a three digit number representing the unique error Errors are displayed for three seconds or until the error causing condition is remedied whichever is longer See Appendix A for a detailed list of error messages 18 OMM 6810B IU Jx Lightwave INSTALLATION AND OPERATION Rear Panel Connections Rear Panel Connections Refer to Figure 2 2 for the following discussions of rear panel connections GPIB DU nnnnnnnnnnnn H1 AH1 76 L4 SR1 RL Dr D POWER ANALOG OUTPUT MNIEX sisse 6810bp_1 Figure 2 2 OMM 6810B Rear Panel AC Power Entry Module The AC Power Entry Module is located on the right side of the 6810B rear panel The instrument must be connected to an AC source in order to operate GPIB Connector The
71. le GPIB Interface Messages ACG GTL OTA PPR3 REN SRQ ATN IDY PCG PPR4 RFD STB DAB IFC PPC PPR5 RQS TAG DAC LAG PPE PPR6 SCG UCG DAV LLO PPD PPR7 SDC UNL DCL MLA PPR1 PPR8 SPD UNT END MTA PPR2 PPU SPE Non Supported Remote Interface Messages Table 3 6 contains GPIB interface messages which are known to be incompatible with the 6810B Other interface messages which do not appear above may also be incompatible with the 6810B Table 3 6 Non Supported Interface Messages for the OMM 6810B EOS MSA NUL GET OSA TCT 46 OMM 6810B iU Jx Lightwave Condition Status Register COND Alt 3H Ol 4 9 Zi hshahahohikho 9 aL 71 6l 5 AL 3l 21 1 Condition Status Enable Register ENAB COND Standard Event Status Register ESR GPIB IEEE 488 2 REMOTE OPERATION Remote Interface Messages LOGICAL OR 0 Power Overrange 1 Power Underrange 2 Wavelength Overscale 3 Wavelength Underscale 4 Input Unstable 5 Head measures Power 6 Head measures Lambda 7 Holding the lambda meas 8 Measuring the lambda 9 Unit is zeroed 10 Attenuation activated 11 User Cal activated 12 Calculation Error 13 Hardware Error 14 Software Error 15 Checksum Error Event Status EVE Register al 7
72. least 3 inches 7 5 cm of compressible packaging material Shipping damage is not covered by this warranty 5 Secure the packing box with fiber reinforced strapping tape or metal bands 6 Send the instrument transportation pre paid to ILX Lightwave Clearly write the return authorization number on the outside of the box and on the shipping paperwork ILX Lightwave recommends you insure the shipment If the original shipping container is not available place your instrument in a container with at least 3 inches 7 5 cm of compressible packaging material on all sides Repairs are made and the instrument returned transportation pre paid Repairs are warranted for the remainder of the original warranty or for 90 days whichever is greater OMM 6810B vii L DOE Claims for Shipping Damage When you receive the instrument inspect it immediately for any damage or shortages on the packing list If the instrument is damaged file a claim with the carrier The factory will supply you with a quotation for estimated costs of repair You must negotiate and settle with the carrier for the amount of damage viii OMM 6810B IU Jx Lightwave 01 10 Comments Suggestions and Problems To ensure that you get the most out of your ILX Lightwave product we ask that you direct any product operation or service related questions or comments to ILX Lightwave Customer Support You may contact us in whatever way is most convenient PR
73. libration to the factory preset values CAL USER FRONT PANEL REMOTE The CAL USER command enables and disables the effects of the user calibration This command is also used to s tart the user calibration OMH s All lt white space gt Parameters None Note This command is the same as pressing the CAL USER button to enable and disable the effects of the user calibration The CAL USER START command is identical to pressing the CAL SET button while the user calibration is enabled Refer to Chapter 6 of the optical measurement head instruction manual for details about the user calibration Examples CAL USER START action starts the user calibration CAL USER ON action enables the user calibration CAL USER OFF action disables the user calibration factory preset values are utilized 58 OMM 6810B iit iLX Lightwave COMMAND REFERENCE Command Paths CAL WAVESET FRONT PANEL REMOTE The CAL WAVESET command is used to set the actual wavelenght during the 6810B user calibration white NERO Parameters nrf value is a floating point number representing the actual known wavelength during the user calibration The suffix is the wavelength units see Table 3 2 If the suffix is omitted nanometers is assumed Note This command has the same effect as pressing the CAL SET button during the user calibration Details regarding the user calibration can be found in Chapter 6 of the in
74. log Output Specifications Analog Output An uncalibrated voltage output representing the measured power as a percent of full scale within the selected gain range Voltage 0 to 10 volts Bandwidth 60 Hz Gain ranges 0 5 30 Hz Gain range 6 5 Hz Gain range 7 Display Specifications Left Display Power Display Type 6 digit 7 segment green LED Units Linear Power pW nW uW mW W Units Log Power dBm dB 4 OMM 6810B iU Jx Lightwave 01 10 INTRODUCTION AND SPECIFICATIONS Specifications Range Linear Power Range Log Power 0 000 pW to 999 99 W 99 999 to 99 999 dBm dB Resolution Slow Update Rate Linear Power 0 001 pW Log Power 0 001 dB Resolution Medium and Fast Update Rate Linear Power 0 01 pW Log Power 0 01 dB Right Display Wavelength Display Type 5 digit 7 segment green LED Units Wavelength nm cm Range Wavelength 190 to 30 000 nm 52632 to 333 cm Resolution Wavelength 0 1 nm 0 1 cm Bargraph 16 segment green LED representing the percent of full scale power within the selected gain range Zoom Performs a x10 function on the bargraph display Brightness 5 settings incrementally spaced from darkest to brightest General Specifications Connectors Analog Output GPIB Connector OMH Connector BNC Female IEEE 488 1 1987 Standard 26 pin High Density sub D GPIB Meets ANSI IEEE Standard 488
75. lows ON Enable the AP mode in the current display units OFF Disable the AP mode return to absolute measurements in the current display units Notes This command is equivalent to pressing the DISPLAY LOG LIN button to change the power display units or the DISPLAY AP button to change the display between relative and absolute power readings Power measurements see the POWer query are returned in the units of the present display mode When the delta power function is enabled the absolute power at that instant becomes the reference point for relative power readings Examples POWER MODE LOG action the power display is placed into the dBm scale POW MODE DELTA ON action the absolute power at the time the command is sent becomes the reference point and the display is forced into either the dB or linear AP mode 01 10 OMM 6810B 71 COMMAND REFERENCE POWer MODE FRONT PANEL REMOTE The POWer MODE query returns a string representing the current state of the power display mode POP ow CO Gov Parameters None Response response response where the response data is a string of up to 8 bytes identifying the power display mode as follows PW DELTA PW NW DELTA NW UW DELTA UW MW DELTA MW W DELTA W DBM DELTA DB Notes This command has the same effect as viewing the power display unit indicators When the POWer query is issued the power is returned in the units of the present display Watts dBm AWatts
76. mall unless the GPIB controller takes a long time to request the response Remote Interface Messages The following sections are intended as a reference for using the 6810B with the GPIB option when an understanding of the lower level interface messages is required These sections deal with the remote interface messages which are available with the instrument and they contain a list of the Interface Function subsets This information is generally not required by the user unless there is a question of compatibility of the instrument with a specific controller A list of OMM 6810B 45 GPIB IEEE 488 2 REMOTE OPERATION Remote Interface Messages interface messages which are not supported by the 6810B are shown later in this chapter These messages will be ignored by the 6810B The interface messages listed in this chapter are handled by the Texas Instruments 9914 GPIB interface IC and the 80C188 microprocessor in the 6810B and are transparent to the higher level commands However they may be explicitly used in some GPIB programs A list of the 6810B s allowable interface messages is shown in this chapter Interface Function Subsets Table 3 1 contains the remote Interface Function Subsets which are supported by the 6810B For more information see the ANSI IEEE 488 1 1987 standard Remote Messages The following list contains GPIB remote messages which are compatible with the OMM 6810B GPIB driver Table 3 5 OMM 6810B Allowab
77. mber and v firmware revision number IST Response The INDIVIDUAL STATUS QUERY allows the user to read the current state of the IEEE 488 1 ist local message in the 6810B oom 0 NS 0 ist message is false 1 ist message is true OPC The OPC command causes the device to generate the OPERATION COMPLETE message in the Standard Event Status Register when all pending overlapped commands have been completed See Figure 3 9 A J H e orc gt OPC Response 36 OMM 6810B The OPERATION COMPLETE QUERY places an ASCII character 1 into the 6810B s output queue when all pending operations have failed gt 1 when all overlapped commands are complete iU Jx Lightwave GPIB IEEE 488 2 REMOTE OPERATION Common Commands and Queries PRE This is the PARALLEL POLL REGISTER ENABLE command It sets the parallel poll register enable bits for the format required by the device in order that it may participate in parallel polling from the controller CR fos lt white lt integer SCA See PRE space nrf m where the integer nrf gt is the binary integer sum of the enabled bits in Figure 3 10 The value must be between 0 and 65535 The Parallel Poll Enable Register is logically ANDed with the Status Byte Register If the result is non zero the ist individual status message is set true 7 6 5 4 3 2 1 0 Copy of Status Byte Logica
78. medium measurement rate RATE FRONT PANEL REMOTE The RATE query returns a string representing the current measurement rate Parameters None Response response response terminator where the response data is a string representing the current measurement rate as shown below SLOW MEDIUM FAST Notes The measurement rate is set via the RATE command The measurement rate is determined by observing the frequency of the blinking rate indicator in the upper left corner of the front panel display Examples RATE response SLOW means the current measurement rate is set to slow 82 OMM 6810B iU Jx Lightwave COMMAND REFERENCE Command Paths SECURE SOUPE REMOTE The SECURE command allows the service technician access to the protected user data command PUD This data is normally changed at the factory so the SECURE command is not needed by the user TERM FRONT REMOTE The TERM command allows the programmer to select the message terminator type for GPIB messages CR carriage return lt CR gt lt NL gt new line lt CR gt lt END gt EOI lt CR gt lt NL gt lt ENDs gt NL 2 END NL and END are allowed space gt Parameters An nrf value where the GPIB termination is one of the following 0 lt CR gt lt NL gt lt END gt 4 lt NL gt lt 4END gt 1 lt CR gt lt NL gt 5 NL 2 lt CR gt lt END gt 6 amp END 3 CR Notes lt CR gt lt NL
79. ment is optional white space White space is defined by the syntactic diagram shown in Figure 3 1 where white space character is defined as a single ASCII encoded byte in the range 00 09 0B 20 0 9 11 32 decimal This range includes the ASCII control characters carriage return and the space but excludes the new line character In most practical programming situations the space character space bar would be used as white space White space is generally used to separate syntactic elements and is processed without interpretation 24 OMM 6810B im ILX Lightwave 01 10 GPIB IEEE 488 2 REMOTE OPERATION ANSI IEEE 488 2 Definitions white space character 2 Figure 3 1 White Space Syntactic Diagram nrf value The symbol nrf value refers to the flexible numeric representation as defined by the IEEE 488 2 standard This means is that numbers may be represented in one of three forms integer floating point or engineering scientific notation All of the following are equal nrf values 20 20 20 0 20 0 2 0E 1 2 0E 1 2 0e 1 2 0e 1 lt suffix unit gt The symbol lt suffix unit gt refers to the suffix program data that may follow an lt nrf value gt If the suffix is not used the default suffix is assumed The device interprets any alpha characters following decimal data as a suffix without regard to upper lower case Table 3 2 illustrates the suffixes used by the 6810B including default
80. n the display when errors occur in the multimeter In remote operation the current error list can be read by issuing the ERR query When this is done a string is returned containing the previously unread error messages up to ten which are currently in the error message queue When the error queue is active bit 7 of the Status Byte is also set to one Appendix A contains an explanation of the error messages which may be reported by the OMM 6810B on the display or via remote operation Programming Examples This section provides two simple examples of programming the OMM 6810B over the GPIB Both examples are written in Quick BASIC for driving the National Instruments NI 488 2 GPIB card The first is an example of a driver for GPIB communications with the OMM 6810B The second is an example of how to remotely zero the multimeter These examples are not complete and therefore cannot be used by themselves They do however illustrate the simplicity of programming the 6810B The initialization of some variables and files have been purposely omitted The sample programs are shown on the next page 98 OMM 6810B iit iLX Lightwave CHAPTER 5 MAINTENANCE 5 B El a li a El El mH E E E BH E Ei El EJ a This chapter describes how to maintain the OMM 6810B Calibration Overview It is possible to field calibrate the OMM 6810B with a measurement head attached using a source of known wavelength and or power It is recommended that t
81. nder nominal test conditions The beam of the laser under test should be directed perpendicular to the face of the Measurement probe or head and directly into the aperture The following paragraphs describe front panel operation Functions change slightly depending on the measurement head attached E WARNING Do not attach or remove Optical Measurement Head while power is applied to the Multimeter Please turn the power switch off when changing heads IN ILX Lightwave OMM 6810B 109 Power and or Wavelength Measurement The GPIB LOCAL button is used to take the 6810B out of REMOTE REMOTE operation and to change the GPIB address While in REMOTE press LOCAL to return the device to local front panel LOCAL control While in LOCAL press LOCAL to display the GPIB address While the GPIB address is displayed use the RANGE UP and DOWN arrow buttons to change the address The POWER AUTO button is used to toggle the instrument between automatic and manual gain ranging control If the POWER AUTO indicator is lit the unit is in autoranging mode where the device selects the gain range automatically If the LED AUTO above the POWER AUTO button is not lit the POWER UP and DOWN arrow buttons must be used to manually select one of eight electrical gain ranges The magnitude of the change is evident by viewing the bargraph display RANGE The Power UP and DOWN arrow buttons are multifunctional f IL The functions are listed
82. ng mode the power display autoranges the linear power units and decimal point 01_10 OMM 6810B 15 INSTALLATION AND OPERATION Front Panel Controls Wavelength Display Units The DISPLAY nm cm button toggles the wavelength nm cm display between nanometers nm and wavenumbers cm Delta Power Display Control The DISPLAY AP button is used to set a reference power and begin displaying the change in power from that reference When the DISPLAY 1P button is pressed the power at that instant becomes the reference and the left display begins indicating the change in power from that reference XP can be displayed in linear units AP and the appropriate linear units indicator are illuminated or logarithmic units XP and the dB indicators are illuminated A negative change in power indicates a power lower than the reference power pressing the DISPLAY P button again returns the power display to absolute measurements Delta Lambda Display Control The DISPLAY Aa button is used to set a reference AX wavelength and begin displaying the change in wavelength from that reference When the DISPLAY Ad button is pressed the wavelength measured at that instant becomes the reference and the display begins indicating the change in wavelength from that reference A may be displayed in nanometers AX and nm indicators are illuminated or wavenumbers Az and cm indicators are illuminated Pressing the DISPLAY 2 button again ret
83. ng point number representing the wavelength to be stored in the preselect channel The suffix is the wavelength units If the suffix is omitted nanometers is assumed Notes This command has the same effect as pressing the WAVELENGTH BLUE SHIFT button then the WAVELENGTH AUTO button then one of the preselect lambda buttons 4 1 22 3 or A4 Examples PRESELECT SAVE 2 632 8 NM action saves the wavelength 632 8 nm into preselect channel number 2 RANge FRONT PANEL REMOTE The RANge command is used to select one of the eight electrical gain ranges within the white space gt multimeter Parameters The nrf value is an integer between 0 and 7 Zero represents the lowest amount of gain highest input power and seven is the highest gain lowest input power Notes This command has the same effect as pressing the POWER UP and DOWN arrow buttons to manually control the electrical gain range The magnitide of the gain change is evident by viewing the bargraph display If this command is issued while the unit is in POWER AUTO the unit is forced into manual gain range mode The gain range may be queried by issuing the RANge query Examples RANGE 3 action forces the unit into manual and sets the gain range to 3 RAN 6 action forces the unit into manual and sets the gain range to 6 01 10 OMM 6810B 79 COMMAND REFERENCE Command Paths RANge FRONT PANEL REMOTE The RANge query returns th
84. ng the DISPLAY VIEW REF button displays the power VIEW REF and wavelength reference points on the appropriate display s The DISPLAY BRIGHT button is used to adjust the intensity of the front panel display Pressing this button cycles the BRIGHT brightness through five steps ranging from brightest to dark The DISPLAY ZOOM button controls the sensitivity of the bargraph display In ZOOM mode the ends of the bargraph ZOOM blink and the sensitivity is increased by ten Hoa ae The DISPLAY RATE button controls the speed at which measurements are taken The possible rates are SLOW 16 samples 60m S S MEDIUM 4 samples 60mS S and FAST 1 sample 60 mS S 70 gt m It is possible to calibrate the OMM 6810B with any optical CAL F measurement head using a laser source of known wavelength and or power Pressing the CAL USER button toggles the instrument in and out of the User Calibration USER mode When the LED above the CAL USER button is lit the unit employs the user defined calibration which has been stored in the Optical Measurement Head Pressing the CAL USER button when the CAL USER LED is lit causes the SET instrument to revert to factory calibration Pressing the CAL SET button while the LED above the CAL USER button is lit initiates a user calibration procedure The HOLD light indicates that the light input to the optical measurement head is varying by greater than 1 nm between measuremen
85. ng used PREselect SAVE 2 Sets one of the four preselected wavelengths RANge 1 Sets the gain range manual RANge NONE Returns the gain range auto manual RANge AUTO 1 Sets the autoranging mode on or off RANge AUTO NONE Returns the status of the autoranging RATE 1 Sets the measurement rate RATE NONE Returns the measurement rate string SECURE 1 Used by service personnel to access PUD TERM 1 Sets the program message terminator TERM NONE Returns the program message terminator TIME NONE Returns elapsed time since power up TIMER NONE Returns elapsed time since last TIMER WAVE 2 Sets the wavelength WAVE NONE Returns the set or measured wavelength WAVE AUTO 1 Sets the auto wavelength feature on or off WAVE AUTO NONE Returns the status of auto wavelength WAVE MODE 1 Sets the wavelength display units WAVE MODE NONE Returns the wavelength display units WAVE OFFSET 2 Sets the wavelength offset WAVE OFFSET NONE Returns the wavelength offset WAVE REFerence 2 Sets the reference for AA measurements WAVE REFerence NONE Returns the wavelength reference point ZERO NONE Starts the zeroing function ZERO NONE Returns the status of the zeroing iU Jx Lightwave 01 10 Command Paths COMMAND REFERENCE Command Paths The OMM 6810B device dependent commands are structured in a tree format as shown in Figure 4 2 Each of the legal paths in Figure 4 2 is followed by the legal commands for that path First time users should be
86. nt 830 1100 nm InGaAs Power WaveHead OMH 6795B 10W Power and Wavelength Measurement 1200 1650 nm FC Adapter 6703B 6708B 6722B 6727B AO271 SC Adapter 6703B 6708B 6722B 6727B A0273 FC Adapter 6780B 6790B 6795B CA100 SC Adapter 6780B 6790B 6795B CA150 LC Adapter 6780B 6790B 6795B CA20001 Bare Fiber Holder BF820 Bare Firber Adapter Ring 6780B 6790B 6795B CA120 Bare Fiber Adapter Ring AO120 6703B 6780B 6722B 6727B 6709B 6745B Dual Rack Mounting Kit RM 123 Single Rack Mounting Kit RM 125 01 10 OMM 6810B 3 INTRODUCTION AND SPECIFICATIONS CHAPTER 1 Specifications Specifications Electrical performance and general specifications for the OMM 6810B are listed below The electro optic performance specs can be found in the instruction manual for each optical measurement head All electrical parameters are measured at 25 C Multimeter Electrical Specifications Input Specifications Gain Ranges 0 to 7 10 mA 1 mA 100 pA 10 uA 1 uA 100 nA 10 nA 1 nA Accuracy lt 0 296 of full scale all ranges Linearity 40 196 Noise Floor lt 1pA Temperature Coefficient lt 500 ppm C Stability Short Term 10 minutes lt 100 ppm Long Term 24 hours lt 500 ppm Input Bandwidth Pest 60 Hz Medium 10 Hz Slow 1Hz Display Update Period Fast 60 msec 1 sample Nedi m 240 msec 4 samples 960 msec 16 samples Slow Ana
87. ntains a detailed reference for control of the 6810B front panel Use Chapters 3 and 4 as a guide for controlling the instrument remotely via the IEEE 448 bus GPIB Information specific to each unique Optical Measurement Head OMH is provided in that instrument s Instruction Manual The data provided in this document is particular to the OMM 6810B only Product Overview The OMM 6810B Optical Power and Wavelength Meter is a microprocessor controlled instrument capable of measuring and displaying optical power and wavelength simultaneously Specifically designed to interface with a variety of ILX Lightwave measurement heads the OMM 6810B is for general laboratory optical power and wavelength measurements of laser diodes and other laser sources This instrument can also be integrated with other equipment via the GPIB IEEE 488 2 interface Easy mounting quick setup and alignment and a two meter cable make the ILX Lightwave measurement heads easy to integrate into an experiment Measurement performance and overall accuracy is dependent upon which Optical Measurement Head is used in conjunction with the 6810B All measurement heads are calibrated to NIST traceable standards to ensure accuracy Safety Considerations The high brightness sometimes invisible light output of laser diodes and other laser sources poses a definite eye hazard Direct viewing of the laser output can produce retinal or corneal damage Absorption of the laser light by
88. omatically by the internal microprocessor once every ten minutes The calibration query can be sent to execute the calibration independent of the routine ten minute cycle When sent the 6810B performs the A D calibration The query responds with a message indicating that calibration has been completed successfully A o bX J 34 CAL Lis a S Response 0 Successful calibration 1 Problem encountered during calibration CLS Sending the CLEAR STATUS command resets the Standard Event Register ESR Status Byte STB and Error Queue ERR to zero This command may be used to clear the status registers before enabling SRQ generation from instrument events S ff x N VA 5 Lv ACLS gt 01_10 OMM 6810B 33 GPIB IEEE 488 2 REMOTE OPERATION Common Commands and Queries DLF The DISABLE LISTENER FUNCTION command is used to force the device to cease being a listener X H J 3 DLF gt N B v ESE The STANDARD EVENT STATUS ENABLE command is used to load the STandard Event Status Enable Register The Standard Event Status Enable Register is logically ANDed to the Standard Event Register see Figure 3 9 If the result is non zero then the Event Summary Bit bit 5 in the Status Byte is set to one The ESE command is useful for assigning which events are capable of generating an SRQ white lt integer A i ESE 7 spaces nf 7 N wh
89. or dB Examples POWER MODE response MW means the front panel is displaying absolute power in milliwatts The GPIB query POWer returns absolute power in watts POW MODE response DELTA NW means the front panel is displaying relative power in nanowatts The GPIB query POWer returns relative power in watts POW MODE response DB means the front panel is displaying relative power in logarithmic scale The GPIB query POWer returns relative power in dB 72 OMM 6810B IN ILX Lightwave COMMAND REFERENCE Command Paths POWer OFFset FRONT PANEL REMOTE The POWer OFFset command is used to enter an offset multiplication factor that will be applied to future power measurements white space Parameters The nrf value is a floating point number representing the power offset value This number is a multiplication factor that is applied to future power measurements as shown below Power corrected Power uncorrected x cal factor Notes This function is a GPIB command only To enter an offset via the front panel the user calibration procedure must be executed Refer to Chapter 6 of the optical measurement head s instruction manual The CAL USER ON OFF command can be used to enable and disable the effects of the user calibration offset Examples POWER OFFSET 2 0 action future power measurements will be doubled POW OFF 0 9 action future power measurements will be correcte
90. ors which are caused by trying to implement commands from the wrong path or level For example the following command string is intended to 1 set the device Condition Enable Register and 2 read the device Condition Register ENAB COND 255 COND Instead the 6810B sets the Condition Enable Register to 255 then reads back the Condition Enable Register rather than the Condition Register Placing a colon before a command forces the parser to begin looking for the command at the root level The following example produces the desired effect ENAB COND 255 COND Note CONSULT TABLE 4 1 WHEN A COMMAND STRUCTURE QUESTION ARISES The only exception to the rule described above is when common commands are used Common Commands may be injected between other commands at the same level The following command string is legal WAVE MODE CM CLS REF 632 8 NM iU Jx Lightwave GPIB IEEE 488 2 REMOTE OPERATION Error Messages Error Messages Error messages may appear on either display These errors are also held for retrieval via GPIB The error queue can be read by issuing the ERR command This command returns a string containing up to ten error messages from the error message queue If ERR is sent when the error queue is empty an ASCII zero 0 is returned If the error queue is active bit 7 in the Status Byte is also set to one 1 Appendix A contains an explanation of the error messages which may be reported remot
91. ower display have the path POWER as in the following command to set the display units in dBm POWER MODE LOG Table 4 1 lists all 6810B device dependent commands with the full path shown for each command and a brief description Detailed syntax diagrams and descriptions are provided 50 OMM 6810B iit iLX Lightwave COMMAND REFERENCE Common Commands Common Commands The GPIB Common Commands which are defined by the ANSI IEEE 488 2 1987 standard are described in Chapter 3 These commands do not necessarily reflect front panel operations but are useful for generic device control Some of the common commands are useful for advanced programming techniques such as generating service requests SRQ OMM 6810B Device Dependent Commands This section contains descriptions of all device dependent commands for the 6810B listed in alphabetical order Sub sections for each path are presented listing all of the commands which are legal for that path The command path tree structure is illustrated in Figure 4 2 Descriptions of the common commands and low level remote interface messages are provided in Chapter 3 Table 4 1 Device Dependent Commands NAME PARAMETERS FUNCTION BRIght 1 Sets the brightness of the front panel BRIght NONE Returns the level of the display brightness CAL POWERSET 2 Sets the user calibration power CAL RECall NONE Resets
92. ower Entry Module 00 0c cece eee 19 GPIB Connector socero du aret dete eR e ao aT 19 Optical Measurement Head Input Connector 000 eee ee 19 Analog OUtpUt ec o etaed Bo doi e UR RD Re cs 19 General Operating Procedures 0 00 ccc cece eens 20 Warm up and Environmental Considerations 0000000 20 Other Considerations uaaa 0 0 cee tees 20 Chapter 3 GPIB IEEE 488 2 Remote Operation Preparation for GPIB Control 0 0020 22 GPIB GConttol oaa agu aaa eno EE nodes eU ee Peewee eee re td eee ek 22 GPIB Addiess 2 eee ee aeter dled Rie as eRe ee 22 ANSI IEEE 488 2 Definitions 0 2000s eee eee ee 24 Syntax Diagrams iaqswie rei dasiwohe emia Iq Re LUE Reed ur dan 24 white Spaco zs Vowtia dy ai dp ur he hale ad exse EAR 24 nrt values e usc PSU tue Ps eue Ful t Ro eae a ORO de rr S 25 li El ii OMM 6810B UNIX Lightwave UD MP PEE 25 PROGRAM MESSAGE TERMINATOR 0000002 ees 26 PROGRAM MESSAGE UNIT SEPARATOR 2 0 2 0005 26 PROGRAM HEADER SEPARATOR gt 0 0 0000 eee eae 27 compound command program header 20200 00 eee eee 27 PROGRAM DATA Parameters 00000 cece eee eee eee 28 ARBITRARY BLOCK PROGRAM DATA 202020 0000s 28 PROGRAM DATA SEPARATORS 20000000 eee eee eee 29 Power On Conditions 0000 c eee tees 29 Default Parameters
93. ples response data gt lt response terminator gt where the response data is an integer value representing the lambda preselect channel number that is selected There is not an equivalent front panel command This command returns a number between 1 and 4 representing the preselect wavelength channel number that is present on the wavelength display If the unit is measuring the wavelength or if the wavelength is not one of the preselect channels then a 0 is returned This query does not return the wavelength only the preselect channel number Use the WAVE to query the wavelength on the display A preselect wavelength may be called up via the PREselect CHANnel command The preselect wavelength channels can be programmed via the PREselect SAVE command PRE CHANNEL response 1 means the wavelength stored in preselect channel 1 is present on the wavelength display PRESELECT CHAN response 0 means that the OMM 6810B is measuring wavelength or the wavelength is not a preselected value iU Ix Lightwave COMMAND REFERENCE Command Paths L PREselect SAVE FRONT PANEL REMOTE The PREselect SAVE command is used to program one of the four wavelength preselect channels lt white space gt E lt white E d lt nrf gt space gt lt suffix gt Parameters The first nrf value is an integer number between 1 and 4 representing the preselect channel number The second nrf value is a floati
94. pter 2 for more details It is important to zero the 6810B before taking measurements This is especially true for low input power applications or in cases of high embient ligh intensity When measuring low power levels avoid letting background radiation into the measurement head The zeroing procedure is briefly described below Turn the laser source off or block the laser at the source under test from entering the measurement head Press the DISPLAY ZERO button The 0 digits walks across both displays and the zero indicator flashes to inform the user that the instrument is busy When finished the indicator above the zero button is lit Allow the laser beam to enter the head or strike the probe and proceed with measurements The DISPLAY LOG LIN button toggles the optical power display between linear units and logarithmic units The DISPLAY nm cm button toggles the wavelength display between nanometers nm and wavenumbers cm The DISPLAY 1P button is used to set a reference power and begin displaying the change in power from that reference Pressing the DISPLAY AP again returns the display to absolute power measurements OMM 6810B 111 112 OMM 6810B Power and or Wavelength Measurement The DISPLAY Aa button is used to set a reference AX wavelength and begin displaying the change in wavelength from that reference Pressing DISPLAY A again returns the display to absolute wavelength measurements Pressi
95. r If the result is non zero bit 0 in the status byte is set to one Parameters The lt nrf value whose sum represents the enabled bits below 1 Power Overrange 128 Hold 2 Power Underrange 4096 Calculation Error 4 Wavelength Overrange 8192 Hardware Error 8 Wavelength Underrange 16384 Software Error 16 Input Unstable 32768 Checksum Error Note The event enable register can be read using the ENABle EVEnt query The event status register can be monitored using the EVEnt query If any of the enabled bits in the Event Register are true bit 0 of the status register is set The enable registers retain their values at power up unless the power on status clear flag is set true see PSC in Chapter 3 Example ENAB EVE 16 action an unstable input updates bit 0 of the status byte 01 10 OMM 6810B 63 64 OMM 6810B COMMAND REFERENCE Command Paths ENABle EVEnt FRONT PANEL REMOTE The ENABle EVEnt query returns the value of the OMM 6810B status event enable register Oro Parameters None Response response data gt lt response terminator gt where the response data is the binary sum of the following 1 Power Overrange 128 Hold 2 Power Underrange 4096 Calculation Error 4 Wavelength Overrange 8192 Hardware Error 8 Wavelength Underrange 16384 Software Error 16 Input Unstable 32768 Checksum Error Note The event enable register can be set by using th
96. r overhead for non volatile storage operations However the new information i e new parameter value is buffered and is essentially stored as soon as the command which created it is parsed Therefore even though the OPC flag may not be set immediately after a new parameter value is created the new value is stored for all intents and purposes and command throughput is not directly related to the OPC rate Whenever there is response data in the Output Queue bit 4 is set in the Status Byte Register Whenever there is any error message in the Error Queue bit 7 is set in the Status Byte Register Input Buffer and Output Data The Input buffer is 80 bytes long The PROGRAM MESSAGE gt may be longer however The output response data of the 6810B is sent in blocks of up to 80 bytes in length It is sent using high speed DMA within the 6810B but may be of indefinite length Although some commands have a definite length response such as the MESsage query the response length is indefinite because the 6810B responds to multiple queries in a single response output The user may enter as many queries as desired in a single input message and the 6810B responds to all of them in the same output message if possible All query responses are evaluated at the time the query is parsed and not at the time the response message is sent In most cases this does not create a problem since the time between parsing a query and sending its response is s
97. ranging mode attenuate the input signal using beam splitters or mirrors Measurements are not accurate at a known Be certain the zeroing procedure has been performed wavelength standard correctly as described in Chapter 2 t may be necessary to perform the User Calibration as described in Chapter 6 of the instruction manual for the measurement head The source may be too close to the head and is emitting non lasing radiation into the aperture Measurements are not accurate at known power Be certain the zeroing procedure has been performed standard correctly as described in Chapter 2 t may be necessary to perform the User Calibration as described in Chapter 6 of the instruction manual for the measurement head The source may be too close to the head and is emitting non lasing radiation into the aperture 102 OMM 6810B IU Jx Lightwave TROUBLESHOOTING GPIB Troubleshooting Guide GPIB Troubleshooting Guide If you have difficulty operating the 6810B via GPIB refer to the symptoms below Symptom Corrective Action No response from 6810B upon a GPIB command Make sure you purchased Option 1268 with your remote light does not come on 6810B A connector on the rear panel does not necessarily mean the device is GPIB capable e Check that a GPIB cable is connected between the 6810B and the system controller your computer This cable should be less than 3 meters long Che
98. ry sum of the following 1 Power Overrange 128 Hold 2 Power Underrange 4096 Calculation Error 4 Wavelength Overrange 8192 Hardware Error 8 Wavelength Underrange 16384 Software Error 16 Input Unstable 32768 Checksum Error Note The events which are summarized in bit 40 of the status byte can be set by using the ENABle EVEnt command The event status register is cleared when this command is sent or when the CLS command is issued Example EVE response 1 means the power has overranged 66 OMM 6810B I ILX Lightwave COMMAND REFERENCE Command Paths HEAD IDN FRONT PANEL REMOTE The HEAD IDN query returns a string identifying the personality of the optical measurement head that is currently attached to the multimeter PO ra SC m Parameters None Response response data response terminator where the response data is a string of 28 bytes identifying the optical measurement head attached to the multimeter Note This command can be used remotely to identify which optical measurement head is attached to the multimeter Example HEAD IDN response ILX Lightwave Corp OMH 6722 means the OMH 6722 Silicon Power Wave Head is attached to the multimeter 01 10 OMM 6810B 67 68 OMM 6810B COMMAND REFERENCE Command Paths HOLD Parameters Response Note Example FRONT PANEL REMOTE The HOLD query returns an integer value representing the status of the wavelengt
99. s and enunciators are illuminated and the seven segment displays denote 8 Then all LEDs and the displays are turned off while the microprocessor executes a device self test Should the self test fail error message E 720 is displayed The device then loads personality and calibration data from the measurement head The OMH model number is shown on the left display and the firmware version is shown on the right display If an error occurs while loading data message E 711 is displayed If a incompatible head is connected E 713 is displayed If a measurement head is not connected both displays show until a head is attached Refer Appendix A for a detailed explanation of error messages POWER ONLY HEADS POWER AND WAVELENGTH HEADS POWER AUTO ON ON ATTN OFF Not Used AUTO WAVE OFF ON USER CAL OFF OFF ZERO OFF OFF ZOOM OFF OFF BRIGHTNESS BRIGHTEST BRIGHTEST RATE MEDIUM MEDIUM LEFT DISPLAY P lin P lin RIGHT DISPLAY A nm A nm Table 2 1 OMM 6810B Default Settings iU Jx Lightwave INSTALLATION AND OPERATION Front Panel Controls Front Panel Controls The OMM 6810B is intuitively operated from the front panel keypad indicator LEDs and dual displays The front panel will change form slightly depending upon the measurement head attached to the instrument A drawing of the front panel is shown in Figure 2 1 Key words pertaining to instrument functions are shown in bol
100. s which if not avoided could result in death serious or minor injury or damage to the product Specifically A CAUTION Caution indicates a potentially hazardous situation which can result in minor or moderate injury or damage to the product or equipment AA warnine Warning indicates a potentially dangerous situation which can result in serious injury or death Fe WARNING Visible and or invisible laser radiation Avoid direct exposure to the beam General Safety Considerations If any of the following conditions exist or are even suspected do not use the instrument until safe operation can be verified by trained service personnel Visible damage e Severe transport stress Prolonged storage under adverse conditions Failure to perform intended measurements or functions If necessary return the instrument to ILX Lightwave or authorized local ILX Lightwave distributor for service or repair to ensure that safety features are maintained see the contact information on page ix All instruments returned to ILX Lightwave are required to have a Return Authorization Number assigned by an official representative of ILX Lightwave Corporation See Returning an Instrument on page vii for more information IN ILX Lightwave OMM 6810B Ld ob SAFETY SYMBOLS This section describes the safety symbols and classifications Technical specifications including electrical ratings and weight are included within the manual
101. status clear flag is set true see PSC in Chapter 3 Example ENAB COND 3 action allows the power overrange and underrange conditions to be summarized in the status byte 01 10 OMM 6810B 61 COMMAND REFERENCE Command Paths ENABle COND FRONT PANEL REMOTE The ENABle COND query returns the value of the 6810B status condition enable register LOreS O 63 6 Parameters None Response response data response terminator where the response data is the binary sum of the following 1 Power Overrange 256 Measuring the Wavelength 2 Power Underrange 512 Unit is Zeroed 4 Wavelength Overrange 1024 Attenuator Activated 8 Wavelength Underrange 2048 User Calibration Activated 16 Input Unstable 4096 Calculation Error 32 Head Measures Power 8192 Hardware Error 64 Head Measures Wavelength 16384 Software Error 128 Holding the Measurement 32768 Checksum Error Note The condition enable register can be set by using the ENABle COND command The condition status can be monitored by the COND command Example ENAB COND response 144 means an unstable input signal and the hold lambda indicator are allowed to be summarized in the status byte 62 OMM 6810B iU Jx Lightwave COMMAND REFERENCE Command Paths ENAB1le EVEnt FRONT PANEI REMOTE The ENABle EVEnt command sets the event status enable register This register is a filter which is logically ANDed to the event registe
102. struction manual for the optical measurement head The proper test equipment must be in place for this command to work properly Examples CAL WAVESET 632 8 action sets the A in the user calibration to 632 8 nm CAL WAVESET 10000 CM action sets the in the user calibration to 10000 wavenumbers 01 10 OMM 6810B 59 60 OMM 6810B COMMAND REFERENCE Command Paths COND REMOTE The COND query returns the value of the 6810B condition status register POP ewe Parameters None Response response data gt lt response terminator gt where the response data is the binary sum of the following 1 Power Overrange 256 Measuring the Wavelength 2 Power Underrange 512 Unit is Zeroed 4 Wavelength Overrange 8 Wavelength Underrange 1024 Attenuator Activated 2048 User Calibration Activated 16 Input Unstable 4096 Calculation Error 32 Head Measures Power 8192 Hardware Error 64 Head Measures Wavelength 16384 Software Error 128 Holding the Measurement Note Example 32768 Checksum Error The condition status may be constantly changing This register is not cleared set to zero when queried or when the CLS command is sent In other works this register always reflects the real time condition of the instrument The conditions above are filtered by the condition enable register see ENABle COND before being summarized in the status byte Refer to Figure 3 12 COND r
103. suffix values Table 3 2 Suffixes Used by the OMM 6810B Suffix Definition NM Nanometers UM Micrometers CM Wave numbers PW Picowatts NW Nanowatts UW Microwatts MW Milliwatts W Watts DBM Decibels 1mW ref DB Decibels Default suffix OMM 6810B 25 GPIB IEEE 488 2 REMOTE OPERATION ANSI IEEE 488 2 Definitions white space nif value lt b gt lt suffix unit gt Figure 3 2 Suffix Syntactic Diagram PROGRAM MESSAGE TERMINATOR gt When a command is sent using the standard format the host computer or GPIB driver usually puts a lt CR gt lt NL gt lt END gt carriage return line feed EOI on the data bus following the command string The IEEE 488 2 standard requires either lt NL gt lt 4ENDs gt NL or lt END gt as an acceptable PROGRAM MESSAGE TERMINATORs while the CR is treated as white space ignored The 6810B accepts any PROGRAM MESSAGE TERMINATOR shown in Figure 3 3 The 6810B terminates its responses with a lt NL gt lt END gt unless the user changes the terminator via the TERM commana 5 END lt white space A x NL y END Figure 3 3 PROGRAM MESSAGE TERMINATOR Syntax Diagram If you encounter problems with GPIB communications refer to your GPIB driver manual for the exact syntax of the output terminator PROGRAM MESSAGE UNIT SEPARATOR gt A PROGRAM MESSAGE UNIT SEPARATOR is used to separate sequential
104. sure the GPIB controller card in the host computer is configured properly See Appendix C Check GPIB cables and the GPIB address 01 10 OMM 6810B 103 TROUBLESHOOTING GPIB Troubleshooting Guide 104 OMM 6810B IN ILX Lightwave APPENDIX ERROR MESSAGES Ie B a B lg L El E mH El E El E z El When errors occur messages may appear on either display In remote operation the current error list can be read by issuing the ERR query When this is done a string is returned containing all of the error messages which are currently in the error message queue up to ten Table A 2 contains all of the error messages which may be generated by the device Not all of these messages may appear on the front panel display Some refer to GPIB activities only The errors codes are numerically divided into areas of operation Errors which pertain to the following areas are listed in the ranges shown in Table A 1 Error Code Range Area of Operation E 001 to E 099 Internal Program Errors E 100 to E 199 Parser Errors E 200 to E 299 Execution Control Errors E 300 to E 399 GPIB Errors E 400 to E 699 Not Used E 700 to E 999 Hardware Errors Table A 1 Error Code Classifications iit iLX Lightwave OMM 6810B 105 106 OMM 6810B Error Code Explanation E 001 Memory allocation failure
105. t continues to search the command tree until it finds a legal command path by searching each previously used node up to the root If no legal path is found the instrument generates an error message For more information on creating and using 6810B commands see Advanced Programming in this chapter PROGRAM DATAs gt Parameters Parameters and other lt PROGRAM DATA may be entered after a command in a PROGRAM MESSAGE UNIT The COMMAND PROGRAM HEADER command and first lt PROGRAM DATA UNIT parameter must be separated by a PROGRAM HEADER SEPARATOR white space ARBITRARY BLOCK PROGRAM DATA gt This element allows any 8 bit bytes including extended ASCII to be transmitted in a message The syntax for an ARBITRARY BLOCK PROGRAM DATA element is shown in Figure 3 7 28 OMM 6810B IU mJx Lightwave GPIB IEEE 488 2 REMOTE OPERATION ANSI IEEE 488 2 Definitions non 8 bit zero digit data digit byte p Z Z oo lt 8 bit JC UN AN O gt data NL S END N Z byte gt Ns Pd hs K where a non zero digit is defined as a single ASCII encoded byte in the range 31 39 49 57 decimal 8 bit data byte is defined as an 8 bit byte in the range 00 FF 0 255 decimal NL is a new line LF and END is an end or identify EOI Figure 3 7 ARBITRARY BLOCK PROGRAM DATA gt Syntax Diagram The only OMM 6810B command that required arbitrary blo
106. th and automatically compensate the power measurement If desired these heads may also be used in the manual wavelength mode similar to the power probes and thermal heads This command forces the unit into manual wavelength mode indicator above the WAVELENGTH AUTO button is not lit and the HOLD indicator is lit Examples WAVE 632 8 action the wavelength is set to 632 8 nm The HOLD indicator is lit and the WAVELENGTH AUTO indicator is not lit WAVE 980 NM action the wavelength is set to 980 0 nm The HOLD indicator is lit and the WAVELENGTH AUTO indicator is not lit 01 10 OMM 6810B 87 COMMAND REFERENCE Command Paths WAVE FRONT PANEL REMOTE The WAVE query returns the wavelength in the units of the current display This query may return measured wavelength or the wavelength set by the user depending upon the status of WAVELENGH AUTO Parameters None Response response data where the response data is a floating point number representing the wavelength in the units of the present display mode Notes The response is in the form of nanometers or wavenumbers depending upon the current state of the wavelength display The response may also be in relative terms if the AX mode is enabled The units are not returned with the wavelength Examples WAVE response 632 8 means the measured wavelength is set to 632 8 nanometers or the delta wavelength is 632 8 nanometers or the user has programmed the wa
107. the desired GPIB address The usable range is 0 to 30 In three seconds the new address is stored and the display returns to standard measurements Power Autoranging Manual Control Press the POWER AUTO button to toggle the unit between automatic and manual gain ranging If the LED above the POWER AUTO button is lighted the unit is in autoranging mode where the AUTO instrument automatically selects the electrical gain range In autoranging the 6810B automatically chooses the power units pW nW uW mW or W In manual gain control the POWER UP and DOWN arrow buttons are used to select one of eight electrical gain ranges The magnitude of the gain change is evident by viewing the display Use the POWER UP DOWN buttons to increase and decrease the gain The linear power units and position of the decimal point are appropriately chosen but frozen for that gain range If the POWER UP or DOWN arrow buttons are pressed and the normal click is not heard then the maximum or minimum gain range has been reached If the POWER UP or DOWN buttons are pressed while the POWER AUTO indicator is lighted the 6810B is forced into manual gain control If switching from autoranging to manual gain control the OMM 6810B continues to meausure wavelength until the gain range is changed 01_10 OMM 6810B 11 12 OMM 6810B INSTALLATION AND OPERATION Front Panel Controls Power Up Down Arrow Buttons T The Power UP and DOWN arrow
108. the eye causes localized heating and denaturing of tissue proteins The ANSI publication IDILX Lightwave OMM 6810B 1 INTRODUCTION AND SPECIFICATIONS Product Overview Z 136 1 The Safe Use of Lasers lists Maximum Permissible Exposure MPE levels for direct or intrabeam viewing of laser beams From the MPE levels a hazard zone may be computed for a particular laser and exposure time For more information concerning laser and laser diode safety contact the Center for Devices and Radiological Health or ILX Lightwave AA warnine Refer Servicing to only to qualified authorized personnel 2 OMM 6810B IN ILX Lightwave INTRODUCTION AND SPECIFICATIONS Product Overview Available Options and Accessories Options and accessories available with the OMM 610B include the following Description Model Number Silicon PowerHead OMH 6703B 1W Power Measurement 400 1100 nm InGaAs Power Head OMH 6708B 100 mW Power Measurement 800 1600 nm Silicon Power WaveHead OMH 6722B 1W Power and Wavelength Measurement 400 1100 nm InGaAs Power WaveHead OMH 6727B 1W Power and Wavelength Measurement 950 1650 nm Silicon Power WaveHead OMH 6732B 1W Power and Wavelength Measurement 350 530 nm Silicon Power WaveHead OMH 6780B 1W Power and Wavelength Measurement 830 1100 nm Silicon Power WaveHead OMH 6790B 10 W Power and Wavelength Measureme
109. the last TIMER query was issued Parameters None Response response data where the response is character data in the form hours minutes seconds Notes Each time the TIMER query is issued the timer is reset to 00 00 00 0 and the elapsed time since the last TIMER query is returned The timer counter is initialized at power up The first time the TIMER query is issued its response is the same as the TIME query The clock turns over after about 1193 hours Example TIMER response 6 24 50 06 means that 6 hours 24 minutes 59 06 seconds have passed since the last TIMER query was issued response terminator gt 86 OMM 6810B IN ILX Lightwave COMMAND REFERENCE Command Paths WAVE FRONT PANEL REMOTE The WAVE command is used to set the wavelength for power calibration purposes Parameters The lt nrf gt parameter is a floating point number representing the wavelength The suffix is an approvd wavelength suffix as shown in Table 3 2 If the suffix is omitted nanometers is assumed Notes This command is similar to setting the wavelength via the WAVELENGTH AUTO LEFT RIGHT UP and DOWN arrow buttons as described in Chapter 2 The wavelength of the laser source must be known in order for the unit to provide accurate power measurements The operator must enter the wavelength for the power heads via the front panel or the WAVE command The self calibrating power wave heads can measure the waveleng
110. ts In this condition the HOLD indicator blinks slowly and the 6810B holds the last stable measurement on the display and uses that wavelength to calculate power The wavelength is held until a stable wavelength is measured iU J Lightwave Power and or Wavelength Measurement EL 074 In manual wavelength mode the 6810B is not measuring wavelength In this case the last measured wavelength or user selected wavelength is frozen on the display and the HOLD indicator is solidly lit The POWER ANALOG OUT is a non calibrated value between 0 and 10 volts representing the ER ANALOG OUT measured power as a percent of full scale power within the selected gain range For example if full scale power for gain range two is 10 mW and the displayed power is 5 000 mW then 5 0 volts is present on the POWER ANALOG OUT connector More Information Read Chapter 2 to become familiar with all of the features of the 6810B GPIB operation is discussed in Chapters 3 and 4 Instruction manuals are also provided with each optical measurement head 01 10 OMM 6810B 113 Lo 7 Power and or Wavelength Measurement 114 OMM 6810B uix Lightwave
111. uffix space gt Parameters The lt nrf gt parameter is a floating point number representing the reference wavelength The lt suffix gt is an approved wavelength suffix as shown in Table 3 2 If the suffix is omitted nanometers is assumed Notes The display mode should be in DISPLAY AX mode before this command is sent Sending the WAVE MODE DELTA ON command or pressing the DISPLAY A button assigns a reference wavelength Use this command to change the reference point while in the AA mode The wavelength reference point may be queried by sending WAVE REFerence Examples WAVE REFERENCE 15000 CM action the reference wavelength is set to 15000 cm WAVE REF 632 8 action the reference wavelength is set to 632 8 nm 01 10 OMM 6810B 95 COMMAND REFERENCE Command Paths WAVE REFerence FRONT PANEL REMOTE The WAVE REFerence query returns a floating point number representing the wavelengh reference The reference is returned in the units of the present display OLOKO Parameters None Response response data gt lt response terminator gt where the response data is a floating point number representing the reference wavelength in the units of the present display mode Notes This command has the same effect as pressing the VIEW REF button The wavelength reference is returned in either nanometers or wavenumbers depending on the mode of the wavelength display Examples WAVE REFERENCE response 632
112. uired to safely operate the instrument Installation AC Power Considerations The device can be configured to operate at nominal line voltages of 100 120 220 or 240 VAC This configuration is normally done at the factory and need not be changed before operating the instrument Ensure the voltage printed on the back panel of the instrument matches the power line voltage in your area Refer to Chapter 6 Maintenance should it be necessary to reconfigure the input AC voltage range AA warnine To avoid electrical shock hazard connect the instrument to a properly earth grounded three prong receptacle only Failure to observe this precaution can result in severe injury or death Tilt Foot Adjustment The instrument has front legs that extend to make it easier to view the display Place the OMM 6810B on a stable base and rotate the feet downward until they lock into position ii ILX Lightwave OMM 6810B 7 INSTALLATION AND OPERATION Power Up Sequence Rack Mounting The OMM 6810B may be rack mounted by installing a rack mount flange on each side of the enclosure Detailed installation instructions are included with the rack mount kit Refer to Chapter 1 for applicable rack mount accessory part numbers Power Up Sequence Connect the instrument to an AC power source Press the POWER switch to supply power to the device and start the power up sequence The power up sequence takes about six seconds Initially all LED
113. urns the wavelength display to absolute measurements A negative change in wavelength indicates a shorter wavelength with respect to the reference 16 OMM 6810B iU J Lightwave 01 10 INSTALLATION AND OPERATION Front Panel Controls View Reference and wavelength reference points on the appropriate display s These references are set via the DISPLAY AP and A buttons Pressing the DISPLAY VIEW REF button displays the power VIEW REF When the DISPLAY VIEW REF button is pressed the reference values are shown in the units of the present display The reference values are shown for three seconds or until the DISPLAY VIEW REF button is pressed again If the DISPLAY VIEW REF button is held down the reference values stay on the display Brightness Control The DISPLAY BRIGHT button is used to adjust the intensity of the front panel display Repeatedly pressing this button BRIGHT cycles the brightness through five possible intensity steps ranging from brightest to dark The keypad is back lighted for viewing in a dark environment The brightness control also affects the illumination of the switches Zoom Control The DISPLAY ZOOM button controls the sensitivity of the bargraph display Pressing DISPLAY ZOOM forces the ZOOM bargraph into a high sensitivity mode where each segment represents 0 7 ten times the normal sensitivity of the total power within the selected gain range In ZOOM mode the end points of the bargraph
114. velength to 632 8 nm WAVE response 10 5 means the delta wavelength is either 10 5 nm or 10 5 wavenumbers depending upon the present display units response terminator gt WAVE FRONT PANEL REMOTE The WAVE command path use used to access the OMM 6810B s wavelength measurement control features The following commands can be reached by first specifying the WAVE command path WAVE AUTO WAVE MODE WAVE OFFset WAVE REFerence WAVE AUTO WAVE MODE WAVE OFFset WAVE REFerence 88 OMM 6810B iit iLX Lightwave 01 10 COMMAND REFERENCE Command Paths WAVE AUTO FRONT PANEL Parameters Notes Example REMOTE The WAVE AUTO command enables disables the wavelength measuring feature of the OMM 6810B The nrf value is a boolean value of 1 or ON to enable wvelength measuremes 0 or OFF to disable wavelength measurements This command has the same effect as pressing the WAVELENGTH AUTO button to control the wavelength measurement If the unit is measuring wavelength the indicator above the WAVELENGTH AUTO button is lit If the unit is not measuring wavelength then the WAVELENGTH AUTO indicator is not lit and the HOLD indicator is lit When this command is issued the last measured wavelength remains on the display until changed by the WAVE command The status of autoranging may be queried by issuing the WAVE AUTO query WAVE AUTO ON action enables wavelength measurements OMM 6810B 89 COMMAND R
115. wavenumbers CM DELTA delta wavelength in the current units NM or CM If the first string data is DELTA then the second string data parameter determines whether or not the AX mode is being enabled or disabled as follows ON enable the AX mode in the current display units OFF disable the AX mode return to absolute measurements in the current display units Notes This command is equivalent to pressing the DISPLAY NM CM button to change the wavelength display units or the DISPLAY AX button to change the display between relative and absolute wavelength readings Wavelength measurements see the WAVE query are returned in the units of the present display mode When the delta lambda function is enabled the absolute wavelength at that instant becomes the reference point for relative wavelength readings Examples WAVE MODE NM action the wavelength display is placed into the nanometers scale WAVE MODE DELTA ON action the absolute wavelength at the time the command is sent becomes the reference point and the display is forced into the AA mode 01 10 OMM 6810B 91 COMMAND REFERENCE Command Paths WAVE MODE FRONT PANEL REMOTE The WAVE MODE query returns a string representing the current state of the wavelength display mode VOD eG Parameters None Response response data response terminator where the response data is a string of up to 8 bytes identifying the wavelength display
116. ypad is backlighted for viewing in a dark environment Local Control mm The LOCAL button is used when GPIB operations are REMOTE implemented When the 6810B is in REMOTE the LED above the LOCAL button is illuminated and all front panel controls except LOCAL LOCAL are disabled Press LOCAL to return the device to local control thus re enabling the front panel If the Local Lockout state has been activated by the host computer even the LOCAL button is disabled In this case the host computer must deactivate Local Lockout before front panel control can be restored When the unit is in LOCAL mode press the LOCAL button to display the GPIB address on the left display i e 01 The address is displayed for three seconds or until the LOCAL button is pressed again 10 OMM 6810B iU Jx Lightwave INSTALLATION AND OPERATION Front Panel Controls Remote Control When the OMM 6810B is addressed by a host computer the LED indicator above the LOCAL button is illuminated and the front panel is disabled from manual control Press LOCAL to return to LOCAL front panel control GPIB Address When the unit is in LOCAL mode pressing the LOCAL switch causes the GPIB address to be displayed The GPIB address may be changed by the following procedure Press and release the LOCAL button If the current GPIB address is not shown on the left display press and release LOCAL again Use the POWER UP or DOWN arrow keys to select

OMM-6810B Optical Power and Wavelength Meter

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