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User`s Guide - Newport Corporation

1. Name Parameters Function CAL USER 1 Set a user cal gain factor CAL USER NONE Request the user cal gain factor COND NONE Request the status condition register DISPlay Turns the display on off DISPlay NONE Returns display state Delays processing of further commands for the DELAY defined time in milliseconds ENABle COND Set the condition status enable register ENABle COND ONE Request the condition status enable register ENABle EVEnt Set the event status enable register ENABle EVEnt ONE Request the event status enable register ERRors ONE Request errors since last ERR request EVEnt ONE Requests the event status register FILTer 1 Select fast medium or slow mode FILTer ONE Request the measurement filter setting ESsage 1 Store character string into message memory MESsage ONE Request character string from message memory MODE NONE Request the measurement mode MODE DB ONE Select decibels dB relative measurement mode ODE DBM ONE Select logarithmic dBm measurement mode ODE W ONE Select linear watts measurement mode POWer NONE Request the value of measured optical power RADix Set numeric responses type RADix ONE Request the radix of numeric responses RANge Set the photodetector current gain range RANge ONE Request the photodetector current gain range RANge AUTO Set AUTO or MANUAL ranging mode RANge AUTO ONE Request status AUTO or MANUAL range REF Set a reference level in dBm REF ONE
2. Grounding Requirements The FPM 8220 Fiber Optic Power Meter comes with a three conductor AC power cable The power cable must be plugged into an approved three contact electrical outlet or used with a three contact to two contact adaptor with the grounding wire connected to an electrical ground safety ground ILX Lightwave recommends connecting the instrument only to properly earth grounded receptacles The power cord connector and power cable meet IEC safety standards WARNING 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 AC Line Power Requirements The FPM 8220 is factory configured for operation at nominal line voltages of 100 120 220 or 240 VAC Make sure the voltage requirements that are printed on the back panel of the instrument matches the power line voltage in your area Contact ILX Lightwave Customer Service if you need to reconfigure the input voltage range Power up Sequence With the FPM 8220 connected to an AC power source pressing POWER supplies AC line power to the instrument and starts the following power up sequence All front panel indicators ON all 7 segment displays indicate 8 All front panel indicators OFF Display shows serial number and firmware version of the meter March 2013 5 FPM 8220 f a measurement head is connected the display shows the mea
3. 10mA 6 MA Determining Range The FPM 8220 will display the gain range by pressing AUTO MAN or the UP ARROW or the DOWN ARROW Relating Optical Power to Analog Voltage The most direct way to relate optical power to analog voltage is to read the power from the front panel or by remote interface while noting the voltage If you set up a remote interface automated system with a data logger or voltmeter you can directly correlate power and analog output voltage in your data You can also get this information from calibrated detector response data You can get the detector response data in two ways 1 The remote commands RESP tells you the calibrated detector response in mA mW for the specified wavelength You can get the response for any wavelength by first using the WAVE command For example WAVE 1480 RESP This sequence returns the calibrated detector response for 1480 nm March 2013 19 FPM 8220 2 The factory calibration certificate includes a table of detector response at every 10 nm The accuracy of power measurement via the analog output of the FPM 8220 is not a factory specification however the user will find it to be stable reliable and useful The following relationship will allow the user to convert analog voltage output into power output P Vineas ower Ces sP Where Vmeas is the voltage measured at the analog voltage output G is the gain of the instrument when operating in range r and p A is
4. 40 dBm lt 1 min 40 dBm lt 1 min 2 5 100 pW 2 5 1 nW 0 006 dB 0 006 dB lt 0 01 dB lt 0 01 dB lt 100 pW p p lt 1nWp p lt 0 2 C lt 0 2 C 0 02 dB 0 02 dB 35 to 20 dBm 35 to 30 dBm Integrating sphere with detector 5mm 5mm lt 0 4 NA lt 0 4 NA InGaAs InGaAs FC SC LC bare fiber bare ferrule DB 26 High Density male 86 x 86 x 100 mm 3 4 x 3 4 x 3 9 0 98 kg 2 15 Ibs 0 8 kg 1 75 Ibs 0 C to 40 C 25 C to 65 C RoHS CE FMH 8705 800 to 1650 nm 85 to 1 5 dBm 10 dBm 3 5 2 pW Detector 3mm lt 0 4NA 3 0 mm InGaAs GENERAL FPM 8220 Input Connector Power GPIB Interface USB Interface Compliance Warm Up Dimensions Weight Operating Environment Storage Environment DB 26 high density female 90 126 VAC 50 60 Hz 207 253 VAC 50 60 Hz IEEE 488 2 2 0 RoHS CE 1 hour to rated specifications 330mm x 216mm x 90mm 13 x 8 5 x 3 5 3 24 kg 7 1 Ibs 5 C to 45 C 25 C to 65 C 2 Reference Conditions Input power level 10 uW continuous wave CW averaging time 1s ambient temperature 21 C 3 C humidity 15 85 non condensing spectral width of source lt 14 nm FWHM user setting of wavelength must correspond to actual source center wavelength 1 nm Recommended calibration period 1 year 3 Accuracy quoted for reference temperature of 21 C 3 C Assume 5 accuracy at the limits of the operating temperature rang
5. Measurements will be reported in dB decibels relative to the reference value March 2013 53 FPM 8220 MODE DBM Action Examples MODE W Action Examples MODE Action Response Notes Examples POWer Action Response Notes Examples March 2013 Common Device Dependent Front Panel Selects Logarithmic dBm units to be used in reporting measurements Mode dBm Measurements will be reported in dBm Common Device Dependent Front Panel Selects Linear watts units to be used in reporting measurements Mode W Measurements will be reported in Watts Common Device Dependent Front Panel Requests FPM 8220 s measurement mode One of the following ASCII character strings dB dBm Ww This information is available on front panel indicators See Chapter 2 The response to MODE is the units of value that will be used for responses to a POW request Mode Response W means that linear measurement mode watts is in effect Common Device Dependent Front Panel Requests the most recent value of measured optical power Numeric value Units defined by MODE commands Value is returned when the next measurement is available in slow mode It may take up to 5 seconds In dB or dBm mode reports the same number as on the display In W mode reports in scientific notation Monitor the Device Event Status Register for over range or under range conditions when using this query M
6. Mode dBm Power Get most recent power measurement in dBm SENSe POWer REFerence lt power gt Using the result lt power gt set the reference to the most recent power measurement SENSe POWer REFerence Common Device Dependent Front Panel Action Requests the reference level value Response GPIB standard nrf value in the units currently defined See MODE Notes Same function as pressing dBm W and REF together on the front panel Examples SENSe POWer REFerence Response 0 means the reference level is 0 dBm SENSe POWer REFerence Response 20 means the reference level is 20 dBm 10 pW SENSe POWer REFerence Response 2 79565E 006 means the reference level is 2 79565 uW Note the change in units SENSe POWer UNIT lt nrf value gt Common Device Dependent Front Panel Action Selects Logarithmic dBm unit or linear units Watts to be used in reporting measurements Parameters 0 logarithmic unit 1 linear unit Notes dBm is the log of the ratio of output power relative to one milliwatt Examples SENSe POWer UNIT 0 Measurements will be reported in dBm SENSe POWer UNIT Common Device Dependent Front Panel Action Requests FPM 8220 s measurement mode Response 0 logarithmic unit 1 linear unit Notes This information is available on front panel indicators See Chapter 2 Examples SENSe POWer UNIT Response 0 means that logarithmic measurement mode dBm is in effect March 2013 64 FPM 8220 SENSe POWer W
7. Requests the contents of the device condition status register ii Over range 4 Under range 8 Measurement data ready 2048 E Unused bits The conditions reported to the status byte are set through the ENABle COND command The condition status may be constantly changing while the event status is only cleared when it is cleared or read See CLS and EVEnt commands See Chapter 3 for more information about register structure COND Response 4 means there is an over range condition 48 FPM 8220 DELAY lt nrf value gt Common Device Dependent Front Panel Action Delays processing of further commands for the defined time in milliseconds Parameters 0 to 65535 Notes Decimal values are rounded Small delay values may have no effect because of time required for command processing The actual minimum delay depends on the situation for example whether a measurement is being done in background This delay command can be useful for creating delays based on the FPM 8220 clock rather than using the controller s clock Examples DELAY 2000 Delay further processing 2 seconds DELAY 48 2 Delay further processing 48 milliseconds DISPlay lt nrf value gt Common Device Dependent Front Panel Action Turns the front panel display on or off including all indicators Parameters 0 OFF 1 ON Notes Other non zero values are interpreted as 1 This command can be useful for wo
8. 3 Laser Cond Summary 04 Interlock 1 State Change 4 Message Available 05 Interlock 2 State Change 6 Service faut 07 Temp Sensor Shorted Service Request Master Statue Summary INS R 08 Output On Off Change 7 Error Available PA 09 N A pu Ansa amp 10 N A Service Request ho amp 11 N A Enable Register py is x 2 12 Calibration Error Queue SRE lt nrf gt SS A 13 N A Not ey SRE eile 27 AR 14 N A Error bsi EIsIsT sT21110 17 Queue Laser Event Status Enable Register LAS ENABle EVEnt lt nrf gt LAS ENABle EVEnt Figure 3 5 Status Reporting Scheme Note that Bit O of the Standard Event Status Register contains the status of the Operation Complete flag Enabling this bit via the ESE command allows the user to update Bit 5 of the Status Byte Then if the SRE mask has Bit 5 set and the user issues an OPC command the SRQ signal will be generated upon completion of the currently processed commands This may be used to initiate service request routines which depend on the completion of all previous commands This allows the use of the operation complete features of the FPM 8220 without the need for program looping or polling which can tie up the GPIB bus Operation Complete on the FPM 8220 is defined as No operations to the power meter hardware are pending No EEPROM non volatile memory write cycles are in progress Note If the GPIB or USB times out while waiting
9. OPC Common Operation Complete Device Dependent Front Panel Action Sets the Operation Complete Bit in the Event Status Register when all pending overlapped commands have been completed Parameters None Notes See the IEEE 488 2 specification for additional information Examples OPC OPC Common Operation Complete Query Device Dependent Front Panel Action Places an ASCII character 1 into the instrument s Output Queue when all pending operations have been finished Parameters None Notes See the IEEE 488 2 specification for additional information Examples OPC response 1 when all overlapped commands are complete March 2013 44 FPM 8220 PSC lt nrf value gt Common Power on Status Clear Device Dependent Front Panel Action Sets automatic power on clearing of the enable registers Parameters One lt nrf value gt where 0 disables power on clearing and 1 enables power on clearing Notes Registers affected Device Condition Status Enable Service Request Enable Device Event Status Enable Standard Event Status Enable Factory default condition Disabled In the disabled state the values of the enable registers are saved through power OFF ON The power on status clear flag see PSC is set false disallowing service request interrupts after power on In the enabled state the enable registers are cleared during power on The power on status clear flag see PSC is set true allowing service request inte
10. ferrule is clean Poor PDR measurement Make sure you are using good low PDL paddles Dirty head Contact Customer Service head needs to be sent in for cleaning ZERO function does not work Error message 531 Zeroing error normally indicates that there is too much environmental light to properly zero the meter The detector head must be connected to a fiber and the source s output must be turned off The instrument reports an error when The instrument performs continuous calculations based on setting a gain range between 0 and 7 by wavelength responsivity and the minimum and maximum remote command the gain range power specifications for the attached head If the calculated changes when changing wavelength or power sensitivity for a gain range is outside the head s a particular gain range cannot be operating parameters the gain range selection will not be selected from the front panel permitted Remotely when a gain range specified is outside operational parameters the instrument adds the error message Data out of range to the error queue The closest valid gain range to the specified gain range will be selected March 2013 FA FPM 8220 Error Messages Error messages may appear on the FPM 8220 display when error conditions occur in the instrument In remote operation use ERR to read the current error list or SYST ERR to read the latest error The ERR command returns a string containing up to 10 of the error
11. messages that are currently in the error message queue Error Code Tables The error codes are classified and placed in tables corresponding to their classification The classifications are Command Errors Execution Errors Device Errors Query Errors and Instrument Specific Errors Table 5 1 Command Errors Table 5 2 Execution Errors Explanation Data out of range Table 5 3 Device Errors Explanation Table 5 4 Query Errors Explanation Query interrupted Query unterminated Table 5 5 Instrument Specific Errors Explanation Measurement head error Internal communication error the instrument needs to be returned to ILX March 2013 72 FPM 8220
12. of the peaking of optical power in alignment applications 0 to 10 V analog output for fine resolution relative power monitoring A sophisticated USB and GPIB IEEE 488 2 interface The fiber optic measurement head includes a two meter cable for convenient positioning near the device under test A heavy robust design for production test workstations Customer upgradeable firmware via USB Figure 1 2 FPM 8220 Rear Panel March 2013 2 FPM 8220 Options and Accessories Options and accessories available for the FPM 8220 Fiber Optic Power Meter and the FMH 8700 series Fiber Optic Measurement Heads include the following The CA 120 bare fiber adapter ring accepts ILX Lightwave BF 820 or Agilent 81000BA bare fiber holders This compatibility also means you can use the BF 820 bare fiber holder with Agilent or HP power meters March 2013 3 FPM 8220 Specifications Wavelength Range Power Range Damage Threshold Accuracy Polarization Dependent Response Measurement Repeatability Noise Temperature Coefficient Linearity Optical Measurement Entrance Aperture Numerical Aperture Sensor Type Connector Types Output Connector GENERAL Size Weight 8715 87107 Weight 8705 Operating Environment Storage Environment Compliance NOTES 1 Limit 40 dBm exposure to lt 1 minute to avoid thermal damage FMH 8715 FMH 87107 800 to 1650 nm 800 to 1650 nm 70 to 20 dBm 60 to 30 dBm
13. points from 1550 nm to 1560 nm Common Device Dependent Front Panel Requests the wavelength to be used in calibrating detector response A GPIB standard nrf value of the current wavelength setting See WAVE above This information is available on the FPM 8220 front panel WAVE Response 1552 means FPM 8220 wavelength response is set to 1552 nm The calibration factor will be interpolated to include 20 of the change in calibration points from 1550 nm to 1560 nm value gt Common Device Dependent Front Panel Applies an offset to internal FPM 8220 amplifiers to eliminate fixed errors from such effects as detector dark current and ambient light This function is the same as the front panel ZERO button Optional values O 7 if no parameter passed all ranges are zeroed Before starting measurements it is good practice to first zero the meter The concept is similar to shorting the leads of a voltmeter and making sure the meter reads zero To eliminate all offsets no light must be on the detector A connector adaptor can be used for this purpose provided a patch cord is connected and the other end of the fiber is not exposed to ambient light You can usually use ZERO with your test setup connected to eliminate small external effects such as ambient room light from your measurement However the FPM 8220 limits the amount of offset because large external influences are too unstable to include in measurements Error Zeroin
14. sure to strip enough fiber to allow 3 0 mm protruding from the front of the Agilent holder after you have the fiber in place With either bare fiber holder check that the fiber extension is straight from the front of the holder If it is not straight this indicates the holder is bending the fiber Bending will affect measurement accuracy and may cause the fiber end to break off Measuring with Cleaved Angles For some applications you may want to use a special cleaver capable of cleaving fiber at an angle This can reduce source instability caused by reflections from the cleaved endface The FMH 8700 series Fiber Optic Measurement Heads can reliably make this measurement If your fiber is cleaved at an angle rotate the fiber holder after inserting it into the head and check whether the rotation effects the measurement For small cleave angles lt 2x you will probably not see an effect For larger cleave angles rotate the holder for a maximum reading Be sure there is enough relaxed fiber behind the holder that the rotation does not induce bending stresses Measuring Higher Power The FMH 8705 will not be damaged by input power up to 10 dBm 10 mW The FMH 8715 and FMH 87107 will not be damaged by input power up to 40 dBm 10 W detected for less than 1 minute However linearity generally moves outside specification limits above the specified input power limit see Table 1 2 on page 4 The best way to measure high power is to use a ca
15. 0 MANUAL ranging 1 AUTO ranging Same function as pressing AUTO MAN on the front panel Range AUTO 1 Set the FPM 8220 into AUTO ranging mode RAN AUTO 0 Set the FPM 8220 into MANUAL ranging mode Common Device Dependent Front Panel Requests the status of AUTO or MANUAL range mode 0 MANUAL ranging 1 AUTO ranging This information is available on a front panel indicator Range AUTO Response 1 means the FPM 8220 is in AUTO ranging mode lue gt Common Device Dependent Front Panel Sets a reference level in dBm 30 to 120 Measurements in dB are reported relative to this reference level See MODE DB is accepted but not necessary for positive values Front panel operation allows you to set the reference to the most recent measurement However the GPIB command allows you to set any arbitrary reference level REF 0 Set reference level to 0 dBm 1 mW Ref 18 24 Set reference level to 18 24 dBm 15 pW Mode dBm Power Get most recent power measurement in dBm REF lt power gt Using the result lt power gt set the reference to the most recent power measurement 56 FPM 8220 REF Common Device Dependent Front Panel Action Requests the reference level value Response GPIB standard nrf value in the units currently defined See MODE Notes Same function as pressing dBm W and REF together on the front panel Examples REF Response 0 means the reference level is 0 dBm Ref Response 20 means the ref
16. 65 feet or 3 meters 10 feet per device USB Communication The USB connector is located on the back rear panel next to the GPIB connector This USB connector is the square B style connector A standard USB A B cable is required to communicate with the instrument To communicate to the instrument using USB install the USB Driver found on the accompanying CD or on the website prior to connecting the unit to the PC Please refer to Chapter 3 for more detailed instructions on operating the instrument through USB Connecting a Measurement Head All optical measurement heads interface with the instrument via the 26 pin high density D connector located on the lower left side of the rear panel Tilt Foot Adjustment The FPM 8220 has front legs that extend to make it easier to view the displays To use them rotate the legs downward until they lock into position Rack Mounting The FPM 8220 conforms to international standards for a 2U height Y width rack mounting Available rack mount accessory kits contain detailed mounting instructions March 2013 6 FPM 8220 Front Panel Operation This section describes the fundamentals of front panel operation for the FPM 8220 Fiber Optic Power Meter Both of the labeled areas on the front panel SETUP and MODE and the display are described below Figure 2 1 Front Panel Display Power On Off The POWER button applies power to the FPM 8220 and starts the power up sequence describe
17. AVelength lt nrf value gt Common Device Dependent Front Panel Action Sets the wavelength in nanometers to be used in calibrating detector response Parameters 800 to 1650 Notes The FPM 8220 s InGaAs detector produces current in proportion to light input The amount of current varies also with wavelength For this reason it is important to give the FPM 8220 correct wavelength information Calibration points are basically every 10 nm When you give the FPM 8220 a wavelength between two calibration points the resulting calibration factor is a linear interpolation between the two points Examples SENSe POWer WAVelength 1552 Set wavelength response to 1552 nm The calibration factor will be interpolated to include 20 of the change in calibration points from 1550 nm to 1560 nm SENSe POWer WAVelength Common Device Dependent Front Panel Action Requests the wavelength to be used in calibrating detector response Response A GPIB standard nrf value of the current wavelength setting See SENSe POWer WAVelength above Notes This information is available on the FPM 8220 front panel Examples SENSe POWer WAVelength Response 1552 means FPM 8220 wavelength response is set to 1552 nm The calibration factor will be interpolated to include 20 of the change in calibration points from 1550 nm to 1560 nm SYSTem COMMunicate GPIB Common Device Dependent Front Panel Action Returns the GPIB address Parameters 1 to 30 Examples SYSTem COMMu
18. Action Requests the most recent value of measured optical power Response Numeric value Notes Units defined by MODE commands Value is returned when the next measurement is available in slow mode lt may take up to 5 seconds In dB or dBm mode reports the same number as on the display In W mode reports in scientific notation Monitor the Device Event Status Register for over range or under range conditions when using this query Examples Mode READ POWer Response of DBM 13 584 means the last measured power was 13 584 dBm March 2013 61 FPM 8220 SENSe CORRection COLLect ZERO lt nrf value gt Common Device Dependent Front Panel Action Applies an offset to internal FPM 8220 amplifiers to eliminate fixed errors from such effects as detector dark current and ambient light Notes This function is the same as the front panel ZERO button Optional values O 7 if no parameter passed all ranges are zeroed Before starting measurements it is good practice to first zero the meter The concept is similar to shorting the leads of a voltmeter and making sure the meter reads zero To eliminate all offsets no light must be on the detector A connector adaptor can be used for this purpose provided a patch cord is connected and the other end of the fiber is not exposed to ambient light You can usually use ZERO with your test setup connected to eliminate small external effects such as ambient room light from your measurement Howeve
19. Command Reference for descriptions of all commands including common commands supported by the FPM 8220 March 2013 35 FPM 8220 Status Reporting This section contains information that is relevant for understanding instrument error and status reporting It also contains information regarding the use of the instrument status for generating interrupts for interrupt driven programs or subroutines Understanding the Operation Complete definition for the instrument is useful for program synchronization Event and Condition Registers In addition to the required IEEE 488 2 status reporting structure the FPM 8220 remote interface provides Event and Condition Registers for power meter operations The Event Registers are used to report events which occur during the operation of the FPM 8220 Fiber Optic Power Meter Events differ from conditions in that events signal an occurrence one time and are not reset until the Event Register is queried or the FPM 8220 is powered off Conditions reflect the current state of the instrument and therefore may change many times during operation Querying a Condition Register does not change its contents Figure 3 5 shows the status reporting scheme of the FPM 8220 Fiber Optic Power Meter Each of the registers which may be accessed by a command or query has the appropriate command or query written above or below the register representation For example the Condition Register may be queried via the COND q
20. ENABle COND Common Device Dependent Front Panel Action Requests the value in the device condition status enable register Response 0 to 65535 Numeric i Value Over range 4 Under range 8 Measurement data ready 2048 Unused bits Notes Enabled disabled conditions can be set by ENABIe COND Changing condition status may be monitored by COND See Chapter 3 for more information about register structure Examples ENAB COND Response 4 means that over range will be reported in status byte bit 3 March 2013 Enable COND Response H4 is the same as 4 except using hexadecimal numbering See RADIx 50 FPM 8220 ENABle EVEnt lt nrf value gt Common Device Dependent Front Panel Action Enables bits in the device event status enable register Parameters 0 to 65535 Numeric i Value Over range 4 Under range 8 Measurement data ready 2048 Unused bits Notes Enabled disabled events can be read by ENABle EVEnt Event status may be monitored by EVEnt Bit 2 of the status byte register is set if any device enabled events are true for generation of service requests See Chapter 3 for more information about register structure Enable registers normally retain their values through power OFF ON unless the power on status clear flag is set true See PSC Examples ENAB EVE 4 Enables over range event to be
21. F pushbutton puts the instrument into reference measurement mode where the displayed measurement is relative to the set reference value When in reference mode the display s enunciator changes to dB or W depending on the mode and a delta symbol is displayed right justified in the enunciator field To set a new reference value hold REF for five seconds To view the set reference value press the dBm W and REF pushbuttons simultaneously The value is displayed for 3 seconds in the parameter line Pressing AUTO MAN changes the instrument s measurement mode to either auto where the gain range is changed through a firmware algorithm depending on the input or manual where the gain range is set by the user If the instrument is in auto measurement mode pressing either of the arrow pushbuttons changes the measurement mode to manual In manual mode the gain range is displayed on the 8 FPM 8220 Filter parameter line Pressing the UP ARROW or the DOWN ARROW changes the gain range The full scale measurement for each gain range is displayed right justified in the parameter field Each measurement head gain range will depend upon the maximum power and the noise floor for the measurement head The table below represents a typical list of available gain ranges FMH 8705 FMH 8715 FMH 87107 7 X X CA A AA ee Y 1W 60 dBm Pressing FILTER offers three display update rates slow medium and fast Indicator Avera
22. OW Basic USB concepts Universal Serial Bus USB is a specification to establish communication between devices and a host controller which has effectively replaced a variety of earlier interfaces such as serial and parallel ports There are three USB standards available including USB 1 1 USB 2 0 and USB 3 0 Our device is designed to conform to the USB 2 0 standard and USBTMC 488 substandard USB cables use 4 lines Power Ground and a twisted pair differential data lines using NRZI encoding The USB connectors are designed so that power and ground are applied before the signal lines are connected When the host powers up it performs the enumeration process by polling each of the Slave devices in turn using the reserved address 0 assigning each one a unique address and finding out from each device what its speed is and what type of data transfer it wishes to perform The enumeration process also takes place whenever a device is plugged into an active network The connectors design along with the process of enumeration and a lot of host software allows devices to be described as Plug and Play March 2013 27 FPM 8220 When the USB device is enumerated and gets an address from the host it presents the host with information about itself in the form of a series of descriptors The device descriptor tells the host the vendor and the product ID The configuration descriptors offer a power consumption value and a number of interface descriptor
23. Options and accessories Y Specifications Safety Considerations M warnine If any of the following symptoms exist or are even suspected remove the FPM 8220 from service Do not use the FPM 8220 until trained service personnel can verify safe operation Visible damage Severe transport stress Prolonged storage under adverse conditions Failure to perform intended measurements or functions If necessary return the FPM 8220 to ILX Lightwave for service and repair to ensure that safety features are maintained Product Overview The FPM 8220 is a precise and reliable tool for fiber optic power measurement The FPM 8220 is compatible with the FMH 8705 FMH 8715 and FMH 87107 fiber optic measurement heads The FMH 8705 accommodates wavelengths from 800 to 1650 nm and accurately measures power over a 86 5 dB dynamic range from 1 5 dBm to 85 dBm Both the FMH 8715 and the FMH 87107 accommodate wavelengths from 800 to 1650 nm The FMH 8715 accurately measures power over a 90 dB dynamic range from 20 dBm to 70 dBm while the FMH 87107 measures over a range of 90 dB from 30 dBm to 60 dBm NIST traceable calibration assures consistent results Other features include Each reading is the average of up to 45 measurements to provide high accuracy even with unstable inputs Store and recall up to ten instrument settings January 2013 1 FPM 8220 Relative power can be displayed by a bar graph on the front panel for visual confirmation
24. Request the reference level value RESP ONE Request the calibrated detector responsivity data TERM 1 Define the message terminator TERM ONE Request the message terminator TIME ONE Request time since powered ON TIMER ONE Requests time since the last TIMER query WAVE 1 Set wavelength for calibrating detector response WAVE ONE Request wavelength for detector response ZERO al Optional Zero specific range ZERO ONE Request status of zero operation 40 FPM 8220 March 2013 Table 4 1 Remote Command Summary Reference List Extra Commands Name Parameters Function DISPlay BRIGhtness 1 Sets the display brightness DISPlay BRIGhtness NONE Returns the display brightness DISPlay ENABle 1 Turns the display on off DISPlay ENABle NONE Returns display state DISPlay MODE 1 Sets the display mode DISPlay MODE NONE Returns the display mode READ POWer NONE Request the value of measured optical power SENSe CORRection COLLect ZERO Apply an internal offset SENSe CORRection COLLect ZERO NONE Request status of zero operation SENSe POWer RANGe AUTO Set AUTO or MANUAL ranging mode SENSe POWer RANGe AUTO NONE Request status AUTO or MANUAL range SENSe POWer RANGe MONitor Set the photodetector current gain range SENSe POWer RANGe MONitor NONE Request the photodetector current gain range SENSe POWer REFerence Set a reference level in
25. Setting Information in Auto Mode Brightness When the brightness is displayed the UP ARROW and the DOWN ARROW adjusts the brightness of the display from 1 to 10 Figure 2 4 Brightness Display Bar Graph The bar graph display shows relative input level as a percentage of full scale for each gain range In fast and medium filter speeds the bar graph will update at 50ms In slow filter speed the bar graph will update every 200ms March 2013 10 FPM 8220 Figure 2 5 Bar Graph Display Error Codes The FPM 8220 indicates front panel operation errors on the measurement display with an error code A complete list of error codes is listed in Chapter 5 March 2013 11 FPM 8220 The FPM 8220 Fiber Optic Measurement Heads The FPM 8220 is compatible with three fiber optic measurement heads FMH 8705 InGaAs Fiber Optic Measurement Head Detector Only 1 5 to 85 dBm FMH 8715 InGaAs Fiber Optic Measurement Head Integrating Sphere 20 to 70 dBm FMH 87107 InGaAs Fiber Optic Measurement Head Integrating Sphere 30 to 60 dBm The FMH 8705 is a detector only measurement head designed to provide a low optical power measurement range The FMH 8715 and FMH 87107 use integrating sphere technology to provide high accuracy optical power measurements More than a simple integrating sphere the innovative integrating cavity design in the FMH 8715 and FMH 87107 is the primary reason the FMH 8220 Fiber Optic Power Meter is able to
26. Time Response 0 32 01 76 means 32 minutes and 1 76 seconds have elapsed since power ON Common Device Dependent Front Panel Requests the time since the last TIMER query Resets the TIMER clock to zero ASCII character data in the form hours minutes seconds Maximum time clock turns over is 1193 hours 50 days The TIMER clock is independent of the TIME clock See TIME above The TIMER clock is set to zero at power ON so the first response will be the same as a TIME query Timer Response 0 00 12 07 means 12 07 seconds have elapsed since the last TIMER query 58 FPM 8220 WAVE lt nrf value gt Common Action Parameters Notes Examples WAVE Action Response Notes Examples ZERO lt nrf Action Notes Examples March 2013 Device Dependent Front Panel Sets the wavelength in nanometers to be used in calibrating detector response 800 to 1650 The FPM 8220 s InGaAs detector produces current in proportion to light input The amount of current varies also with wavelength For this reason it is important to give the FPM 8220 correct wavelength information Calibration points are basically every 10 nm When you give the FPM 8220 a wavelength between two calibration points the resulting calibration factor is a linear interpolation between the two points WAVE 1552 Set wavelength response to 1552 nm The calibration factor will be interpolated to include 20 of the change in calibration
27. a 17 PAT VAG ROIT REIN LOA ict acetal en einac coc A A Gaga onGdeubded 18 Gain Range Boundaries reniei kentii oiia dd dd dd iis 19 De tenmining Range ii O nasil aida hae lide eed eed 19 Relating Optical Power to Analog Voltage oooooinnnccinnnnnnocinnnococcnnnnnoncnonono nan nnnno nan r nano rra rnnr rra 19 General OPA as 21 Warm up and Environmental Considerations c ccccccceceeeeeeeeceeceeeeeeeeeesecaeaeeeeeeesessesusaeeeeeees 21 Summary of Operating Procedures adori naiari E rE EREE AT AEREE ERIRE EARNER TENE 21 Chapter 3 Remote OperatiON ooccccccconoccccccccnocccononnnoncncnnnnnnnnccnnnnnns 23 Remote Operation Features naseer arent aodare aeae e daaa iaa olaaa ka earan Sain EADAE kE Eaa 23 EE o A A A E E T 24 Data and Interface Messages ito AA la eed 24 Talkers Listeners and Controllers civic ido rara andanada narrada idad eae 24 GPIB Cable Connections ria ota 24 Ane GPIB Connector chee oue seen ee cee Ree e eee ae eee eels 25 Configuring the GPIB Controller sis hex fetes desis tenet dons bet hn bent Da at Ne it Da it Da tb Dn dd 27 Changing Operation from Local to Remote ooooonccccnnociccnonoccccnononcncnnnoncnnnnno nn nc nnnnn nn r rana nn rra rn 27 setting the GPIB Address iii a canarias dia 27 Basi USB CONnCEDIS cerere nene AA A AAA AA ARA 27 GPIB vs USB COMMUNICA ION sara a EAA RA A RA 28 March 2013 ii FPM 8220 Command MiS aa 29 betters Savalas Aa staat etm teal ald th lhe al alin fed n
28. able 3 6 shows some examples of invalid syntax command strings that will produce errors Table 3 6 Invalid Syntax Command Strings COMMAND COMMENT SYSTEM ERROR Missing colon RANGE AUTO 1 IDN Missing semicolon ADDRESS GPIB Space not allowed before question mark Space missing between WAVE command and the parameter WAVE1234 IDN value 1234 March 2013 33 FPM 8220 IEEE 488 2 Common Commands The IEEE 488 2 Common Commands and Queries are distinguished by the which begins each mnemonic The diagrams below show the syntax structure for common commands common command queries and common commands with numeric data required amp COMMAND MD Common Command Common Command Query lt decimal lt white space gt numeric program data gt Common Command with Numeric Data Figure 3 4 Common Command Diagrams Numeric data is required with PSC 1 on O off RCL 0 10 see front panel Recall function SAV 1 10 see front panel Store function and ESE 0 255 see Figure 3 5 GPIB connector diagram All the IEEE 488 2 Common Commands supported by the FPM 8220 are listed in Table 3 7 March 2013 34 FPM 8220 Table 3 7 IEEE 488 2 Common Commands Supported by FPM 8220 CAL CLS ESE ESE ESR IDN OPC OPC PSC PSC RCL RST SAV SRE SRE STB TST WAI See Chapter 4
29. achieve the rated accuracy allow the FPM 8220 to warm up for at least one hour before use Operate the meter within the environmental limits specified in Chapter 1 The best accuracy is achieved near the calibration temperatures Summary of Operating Procedures The following list is a summary of operating procedures discussed in depth earlier in this chapter 1 2 Install the appropriate fiber adaptor in the detector head Connect your input fiber or patch cord Recall your previously saved setup by pressing RECALL or by setting the parameters individually as described in the following steps a Press WAVELENGTH and adjust the wavelength by pressing the UP ARROW or the DOWN ARROW b Press AUTO MAN to select either auto or manual gain range In manual gain mode press the UP ARROW or the DOWN ARROW to adjust the gain Set the calibration constant by pressing CAL The factory default for this factor is 1 000 Input power a In manual mode the display OVR indicates the input power is greater than 97 5 of the range In auto mode this indicates input power is greater than 1 4mW for model 8705 100mW for model 8715 or 1W for model 87107 b In Manual Range mode the display 99 999 dBm or 0 000 nW indicates the input power is less than 5 0 of range In Auto Range mode this indicates input power is less than 3 2x10 mW for model 8705 1 0x10 mW for model 8715 or 1 0x10 mW for model 87107 To save a new setu
30. afety markings used on the instrument Y Information about the warranty Y 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 situations 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 M warnine Warning indicates a potentially dangerous situation which can result in serious injury or death oe 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 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 January 2013 v FPM 8220 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 fo
31. al number from the rear panel of the instrument Attach the anti static protective caps that were shipped with the instrument and place the instrument in a protective anti static bag Place the instrument in the original packing container with at least 3 inches 7 5 cm of compressible packaging material Shipping damage is not covered by this warranty Secure the packing box with fiber reinforced strapping tape or metal bands 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 remainder of the original warranty or for 90 days whichever is greater 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 March 2013 viii FPM 8220 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 Li
32. ated sd ica ad eet tte cd mids Rie al ala a 29 AMES Space At ere ie Patek ee e ee eee 29 Terminators A ela ee a ee ae eee seeks 30 Command Separators a sc ein A ey an nda A ERE 30 Parameters e ee O 30 Command Tree Structure A A nee 32 syntax SUMMA A ade R a eaten lead 32 IEEE 488 2 Common Command cccccccececceceeceeeeeeeeeceaeaaeceeeeeeesecceaaeceeeeeeesecseceeeeeeeeeseeneenaees 34 SIS ROOM ee oe 36 Event and Condition Registers vinci ee E AR RE 36 Command TMNT rean di nile ade eh a ee E ee 38 Sequential Overlapped COMMANdS ccccccceeececceececeeeeeeeceneaeeeeeeeeeeseccaaeceeeeeeesensacaeeeeeeeeeeeees 38 Query Response TIMING orriari tddi ee 38 Chapter 4 Command Reference cccccseeeeeeeeeneeeeeeeeeeeeeeeeeesaaas 39 Remote Command Reference SUMMALY cceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeteeeeees 39 Command Relerence AA AAA AAI A AI A A AAA ARA 42 Chapter 5 Troubleshooting oocccccccoooccccnccononocononnnnncnnnnnnnnnncnnnnnnns 67 Troubleshooting CUIdS oso tetas etans etait E eae al 68 Optical Measurement Problems ccecccceceeeeeeeeeeceeeeeeeeeeceeaaeceeeeeeesecaaaaeceeeeseeseetecsieeeeeeeeetees 71 Error Messages erea deals dels eset 72 Error Gode Ta ES tia alain a aE S 72 March 2013 iii FPM 8220 This page was intentially left blank March 2013 iv FPM 8220 Safety and Warranty Information Y Details about cautionary symbols Y S
33. ay the fiber in the holder with the stripped and cleaved fiber protruding from the nose detector side of the holder 4 Gently pull the fiber until the buffer is aligned with the marks on the holder Make sure the buffer does not extend beyond the marks toward the nose end of the holder March 2013 15 FPM 8220 Figure 2 11 Place Fiber in BF 820 Holder 5 The fiber must extend between1 0 mm and 5 0 mm from the holder to ensure accurate measurements from the FPM 8220 6 Release the feet and close the holder The holder is held shut by a spring and several magnets Grasping the holder by the body insert the fiber holder into the bare fiber adaptor ring making sure that the fiber endface does not touch anything If the fiber endface makes contact with anything it must be cleaned and recleaved Note Make sure to grasp the holder by the body when inserting or removing it from the detector Grasping the holder by the feet can cause the fiber to come loose 7 Connect or turn on your light source Figure 2 12 Inserting the BF 820 March 2013 16 FPM 8220 Measuring with the Agilent 81000BA Bare Fiber Holder Refer to Agilent documentation for detailed instructions on the use and care of the 81000BA If you are familiar with the Agilent 81000BA bare fiber holder and have established procedures the FPM 8220 does not require you to change those procedures The measurement procedure is the same as the BF 820 described above Be
34. calibration points Figure 2 13 is a sample of detector response plotted as a function of wavelength The chart is based on data from the FMH 8700 series of Fiber Optic Measurement Head calibrations that are performed at ILX Lightwave s NIST traceable calibration laboratory 0 0019 0 0017 0 0011 0 0009 onsivity 2 0 0007 w ce 0 0005 0 0003 0 0001 800 900 1000 1100 1200 1300 1400 1500 1600 Wavelength nm Figure 2 13 Sample Detector Response The detector response is shown as photodetector current amperes per unit of optical power watts The following are true for all FHM 8700 series Fiber Optic Measurement Heads and are exemplified in the chart in Figure 2 12 e The highest detector current greatest sensitivity is at the longer wavelengths normally used for telecom work e Changes in detector response are significant enough that the meter must know the wavelength in order to accurately display optical power e The flatness or steepness of the curve at any point is a measure of how much effect an error in wavelength input will have on the measurement result e Detector response is less at shorter wavelengths Analog Output BNC A BNC output connector is provided on the rear panel to give you direct access to the amplified photodetector signal Keep the FPM 8220 in manual range mode when you use the analog output This is a very low noise stable output that is normalized to 10V to represent perce
35. ction Requests the display brightness Response 1 to 10 Examples DISP BRIG Response 5 means the display brightness is 5 which is medium brightness DISPlay ENABle lt nrf value gt Common Device Dependent Front Panel Action Turns the front panel display on or off including all indicators Parameters 0 OFF 1 ON Notes Other non zero values are interpreted as 1 This command can be useful for working in a dark environment Examples DISPLAY 0 Turn off the front panel display Disp enab 1 Enable the front panel display March 2013 60 FPM 8220 DISPlay ENABle Common Device Dependent Front Panel Action Requests the front panel display status Response Returns the display status 0 means OFF and 1 means ON Examples DISPLAY Response 0 means the display is currently shut off Disp Response 1 means the display is in normal state DISPlay MODE lt nrf value gt Common Device Dependent Front Panel Action Set the display mode Parameters One of the following string NORMAL BRIGHTNESS BARGRAPH Examples DISPlay MODE BARGRAPH Set to the bar graph display mode DISPlay MODE Common Device Dependent Front Panel Action Requests the display mode Response One of the following string NORMAL BRIGHTNESS BARGRAPH Examples DISP MODE Response NORMAL means the display is in normal display which will show the wavelength filter mode and auto manual range mode READ POWer Common Device Dependent Front Panel
36. current meter that uses calibration to report photodetector current as optical power This current is proportional to optical power but it also varies with wavelength For more information about gain ranges see Gain Ranges on page 19 There are eight ranges in the FPM 8220 meter Each range increases gain by 10x over the previous range The maximum photodetector current for each range is as follows Range Maximum Current Range Maximum Current Setting the gain range puts the FPM 8220 into MANUAL range mode Examples Range 5 Set the photodetector current gain to range 5 100 nA full scale RAN 6 Set the photodetector current gain to range 6 10 nA full scale March 2013 55 FPM 8220 RANge Action Response Notes Example RANge AUTO Action Values Notes Examples RANge AUTO Action Response Notes Examples REF lt nrf va Action Parameters Notes Examples March 2013 Common Device Dependent Front Panel Requests the FPM 8220 photodetector current gain range Integer number 0 through 7 See the discussion of RANge above for information about gain ranges Response is valid whether the FPM 8220 is in MANUAL or AUTO range mode Range information is not displayed on the FPM 8220 front panel Range Response 5 means photodetector current gain is to range 5 100 nA full scale lt nrf value gt Common Device Dependent Front Panel Sets the FPM 8220 into AUTO or MANUAL ranging mode
37. d nothing is entered an error is generated March 2013 30 FPM 8220 For further clarity in programming the Boolean values of one 1 and zero 0 may be used or their names as indicated in Table 3 5 Table 3 5 Substitute Parameter Values Substitute Name Value ON 1 OFF 0 March 2013 31 FPM 8220 Command Tree Structure The FPM 8220 Fiber Optic Power Meter device dependent commands are structured in a tree format as shown in Figure 3 3 Each of the legal paths is shown followed by its list of path options followed by the commands themselves lt is recommended that the first time user begin learning the commands by using the full path notation Once familiar with the commands command path shortcuts may be used root Z CAL DELAY COND CAL ENAB MODE RANge DISP READ SLOT SYST SENS CLS ERR DiSPey ESE MES DISPlay SR eee lo ESE MES USER COND DB AUTO BRIG POW HEAD COM ERR CORR POW REF ION RAD FlLTOr USER COND DBM AUTO BRIG M REF LTer E OPC TERM FILTer 9 4 7 EVE ENAB UNIT OTG TERM MODE IDN GPIB COLL RANG WAV PSC TIME POWer WAV 5 PSC TIMER RANge WAV PUD 2 RANge PUD CL A ZERO AUTO ZERO AUTO RST RESP ION SAV WAVE ON SRE WAVE SRE ZERO STB ZERO TST WAI Figure 3 3 Command Path Structure Syntax Summary Commands must contain all of the letters shown in
38. d bits and must be a value between 0 and 255 Standard Event Status Register 0 Operation Complete 1 Request Control 2 Query Error 3 Device Dependent Error 4 Execution Error 5 Command Error 6 User Request Standard Event Status Enable Register ESE nrt ESE ESE response 68 meaning the User Request and Query Error bits have been enabled in the Standard Event Status Enable Register 68 2 2 Common Device Dependent Front Panel Requests the value of the Standard Event Status Register None Response is the sum of the enabled bits and must be a value between 0 and 255 Allows for the determination of which type of error has occurred Standard Event Status Register 0 Operation Complete 1 Request Control 2 Query Error 3 Device Dependent Error 4 Execution Error Command Error 6 User Request Standard Event Status Enable Register ESE nrt ESE ESR response 32 meaning a command error has occurred 43 FPM 8220 IDN Common Instrument Identification Device Dependent Front Panel Action Requests the instrument to identify itself Parameters None Notes Returns a comma delimited standard format ASCII identification string from information stored in the instrument during manufacture The information includes vendor name product name serial number and firmware version Examples IDN response ILX Lightwave 8220 82200002 1 0
39. d in Chapter 1 Setup Up Arrow Down Arrow Enter Recall Bin 0 Bin Headinfo March 2013 The UP ARROW amp 9 is used to increase values for gain adjustment wavelength display filter store and recall bins GPIB address and the user calibration factor In auto gain range operation mode the arrow key can be used to put the instrument into manual gain range mode The DOWN ARROW is used to decrease values for gain adjustment wavelength display filter store and recall bins GPIB address and the user calibration factor In auto gain range operation mode the arrow key can be used to put the instrument into manual gain range mode Pressing the ENTER pushbutton stores a new value of the parameter that is currently being adjusted Pressing RECALL allows the user to recall a stored instrument setup from recall bins numbered O to 10 Savable settings include gain range wavelength display mode filter mode and the user calibration offset value To select a stored setup first press the RECALL pushbutton then use the UP ARROW and the DOWN ARROW to select the appropriate recall bin and press ENTER to select the stored bin Factory default instrument configuration Measurement Head information including model number serial number and last calibration date 7 FPM 8220 Store Wavelength Local Remote GPIB Address Mode dBm W REF View Ref Auto Man March 2013 Pressing STORE allows the user
40. dBm SENSe POWer REFerence NONE Request the reference level value Selects Logarithmic dBm unit or linear units SENSe POWer UNIT Watts to be used in reporting measurements SENSe POWer UNIT NONE Requests FPM 8220 s measurement mode SENSe POWer WAVelength 1 Set wavelength for calibrating detector response SENSe POWer WAVelength NONE Request wavelength for detector response SLOT HEAD IDN NONE Returns the head information SYSTem COMMunicate GPIB NONE Returns the GPIB address NONE Requests the current error in the error queue and SYSTem ERRor then removes this error from the error queue March 2013 41 FPM 8220 Command Reference The following pages contain a reference for both common and device dependent commands of the FPM 8220 Fiber Optic Power Meter This reference contains useful information for both local and remote operation of the FPM 8220 CAL Common Device Dependent Front Panel Action Adjusts the internal analog to digital A D converter to reference points then reports results Response Zero OK Non zero calibration error Notes The A D chip in the FPM 8220 performs automatic calibration Thus this query always return 0 Example CAL CLS Common Device Dependent Front Panel Action Clears status event registers Standard Event Status Device Event Status and Error Queue Notes Useful to clear registers before enabling service requests SRQ Example CLS ESE lt nrf value gt Comm
41. deliver excellent repeatability in a production workstation environment Key features of the measurements heads and their benefits to you include Feature Benefits polarization without concern for meter errors holder users Minimal response to rotating the fiber holder with a No need to rotate the fiber holder for non angled cleave maximum reading with a non angled cleave fiber same fiber end face position measurements with confidence fiber to the correct place every time introduce errors Detector head designed to accept ILX s BF 820 or Use ILX s BF 820 holder with Agilent Agilent 81000BA bare fiber holders power heads or use Agilent s 81000BA holders in the FPM 8220 this interchangeability means that there is no need to alter procedures or buy different holders Precision quick align threadless adapters for most Just push in or pull out easily self connector type and the bare fiber holder aligns and snaps into place no threads Protecting the FMH 8705 Fiber Optic Measurement Head The fiber optic measurement head uses a 3mm detector that has been hermetically sealed in a TO Can package To avoid accidental damage the plastic shipping protector should be installed when a fiber optic adapter is not in use March 2013 12 FPM 8220 Protecting the FMH 8715 and FMH 87107 Fiber Optic Measurement Heads The fiber optic measurement head cavity entrance is small 5mm so it will not allow debris to enter the cavity howeve
42. e 0 C lt T lt 40 C due to temperature coefficient a gt wavelength 1580 nm and power 0 5 dBm 6 Fiber Input Repeatability measured by the variation in response from removing and replacing a connectorized single mode fiber into the detector head Does not include bare fiber adapter Wavelength must not be equal to any water vapor absorption line Polarization Dependent Response PDR is a variation in meter response associated with changes in input polarization state Measured at constant 7 Linearity is the variation from an actual measurement to an expected measurement over decades of optical input power Valid across range limits when measured in auto range mode 8 Adapters available for FC SC LC and Bare Fibers 9 Bare fibers can be supported with ILX Lightwave BF 820 or Agilent 81000BA bare fiber holders ILX Lightwave BF 820 fiber holders are designed for fiber diameter 125 um 250 um and 900 um buffer 10 Low power range is measured by dark current in the detectors and is calculated as 3 times of the SNR 11 Measured in slow filter speed mode March 2013 FPM 8220 Chapter 2 General Operation This chapter describes how to set up and operate the FPM 8220 Fiber Optic Power Meter using the front panel controls Y Installation Y Introduction to the FPM 8220 front panel Y FMH 8700 series fiber optic measurement head familiarization Y Analog Output Y General operating procedures Installation
43. e adaptor unless you need to use a different connector type Note Always clean the tip of the connector ferrule before a measurement using the proper tools and a good technique The core of a single mode telecom grade fiber is only about 9ym in diameter the smallest contaminant can cause significant errors To remove an adaptor grasp its outer ring and pull it out March 2013 13 FPM 8220 Measurements through Bare Fiber The aim in developing the FMH 8715 and FMH 87107 was to solve the measurement issues that affect repeatability when the fiber endface is not polished in a connector ferrule The result is a fiber optic power meter optimized for bare fiber measurements The measurements are highly repeatable the meter is easy to use and the detectors are virtually unaffected by the polarization state of the fiber or by the rotation of the fiber holder Fiber optic measurement heads such as the ILX Lightwave FMH 8705 normally have their detector mounted at an angle to prevent reflections back into the input fiber however this arrangement is less than ideal for measurements through bare fiber Among the detractors from measurement repeatability is The variation in distance from the fiber endface to the detector If you are not careful you can scratch the detector face Slight variations in the angle of the glass cleave at the core exit point In a standard telecom fiber the core containing the light is only about 0 5 of the endfac
44. e surface area and that is the only part that matters for exit angle Figure 2 7 Bare Fiber Measurement Diagram The CA 120 Bare Fiber Adapter Ring The CA 120 Bare Fiber Adapter Ring is a round ferrous ring that mounts in the FMH 8700 series Fiber Optic Measurement Heads and mates with magnets in either the ILX Lightwave BF 820 Bare Fiber Holder or the Agilent 81000BA Bare Fiber Holder The adapter ring has no alignment hole so you can just press it into place in the detector head Check that the adaptor ring is flush to the face of the detector head all around Rotating the ring helps to ensure that it is seated properly Figure 2 8 CA 120 Bare Fiber Adapter Ring March 2013 14 FPM 8220 Measuring with the BF 820 Bare Fiber Holder The ILX Lightwave BF 820 Bare Fiber Holder was designed tested and optimized for production workstations Its opening action and internal alignment guides make it easy and fast to correctly place the fiber every time 1 Carefully strip clean and cleave the fiber Strip the jacket then strip at least 1 3 cm of buffer 1 2 inch from the fiber If the fiber endface touches anything after cleaving clean it and cleave it again Note The BF 820 is designed for 125 um clad fiber 6810fo_1 Figure 2 9 Strip and Cleave the Fiber 2 Squeeze the BF 820 bare fiber holder by its feet to open the body and expose the alignment guides Figure 2 10 BF 820 Bare Fiber Holder 3 L
45. eaa rae a ea a aaa a rae aT aera a aara T 5 Power Up SEQUENCE e rrea a ee e ae apace vis At E AAA sg dane DOTA aes 5 Firmware Upgradeability ooooonnncccnnnnncicinnnnccccnnnonccnnn iaiia Laen ANKE EANA NNE A AAA rr 6 GPIB CommMuniGation a is 6 USB COMMUNICATION 202 At AA deen ad ae ees 6 Connecting a Measurement Head c oocccccnincccocinococcnonononcnnnonnnnnnnnnnn cnn rn conca r anna rana n rar rra 6 TEF Adjustment aed ais A Aia 6 Rack MOUNTINY oia ida 6 March 2013 i FPM 8220 Front Panel Operation cas a ias 7 PowerOn OM a A Ai 7 AUN E a e oe er aera caret 7 MOd6 a E E ahaa dd vi diva E da 8 Displays E IAA E VEE iano ate itn E tite ln E hae caine Sa te Ah 10 Error CodeSi tee EA ida 11 The FPM 8220 Fiber Optic Measurement Heads cccceeeeeeeeeeeeeeeeeeeeeeeeeeaeeeeees 12 Protecting the FMH 8705 Fiber Optic Measurement Head cceeceeeeeeeeeeeeeceeeeeeeneeeeeenaeeeeeeaas 12 Protecting the FMH 8715 and FMH 87107 Fiber Optic Measurement Heads 0 eeceeeeeees 13 Measurements through a Connector cooccccccnnococcnonononcnnonononnnnnnno nn cnn conc nr nn anna r nn rr ran nr rar rnnr rn 13 Measurements through Bare Fiber oooinnccccnnncccccnnnococcnonononcnnnnnn cnn nro nn nara nn r nn nr r nn rar 14 Measuring Higher Power ci di iaa 17 Understanding the Calibration Certificate ooooonnnninninnnnnnnnnnnnnnnnnnnnnnnn 17 Photodetector RESponsSIvity 2 si 3 24 ie eagein di ened lied ede need ede e
46. endent Front Panel Action Performs a device reset and sets the OCIS and OQIS states Parameters None Notes OCIS Operation complete Command Idle State This is the same as after OPC no further operations to complete OQIS Operation complete Query Idle State This is the same as after OPC no further operations to complete These states allow the instrument to complete its reset process no operations pending before continuing with other operations Examples RST SAV lt nrf value gt Common Save Device Dependent Front Panel Action Saves the current instrument configuration to non volatile memory Parameters One lt nrf value gt with a value from 1 10 Notes Configuration 0 is reserved for the factory set default configuration It is normally not necessary to save the current setup for next power on The current setup is automatically stored for recall at next power on unless the PSC command is used to clear the power on status Examples SAV 3 response the current instrument configuration is stored in memory location 3 SRE lt nrf value gt Common Service Request Enable Device Dependent Front Panel Action Enables bits in the Service Request Enable Register Parameters An lt nrf value gt whose sum represents the enabled bits Notes Refer to Figure 3 5 in Chapter 3 for a complete description of the Status Byte and Service Request Enable Register Examples SRE 136 action enabl
47. erence level is 20 dBm 10 pW Ref Response 2 795E 006 means the reference level is 2 795 uW RESP Common Device Dependent Front Panel Action Requests the calibrated detector responsivity for the currently selected wavelength Response GPIB standard lt nrf value gt in units mA mW Notes The information should correspond with that on your latest ILX Lightwave calibration certificate for this meter If not contact ILX Lightwave Customer Service to resolve the discrepancy This information can be useful for understanding the characteristics of your FPM 8220 meter Notice for example that detector current is much less at shorter wavelengths For more information see the discussion of the calibration certificate at the end of Chapter Two Examples RESP Response 1 193E 2 means the detector produces 0 01193 mA mW at the currently set wavelength TERM lt nrf value gt Common Device Dependent Front Panel Action Defines the message terminator Paramters 0 lt CR gt lt NL gt lt END gt 1 lt CR gt lt NL gt 2 lt CR gt lt END gt 3 lt CR gt 4 lt NL gt lt END gt FPM 8220 default and IEEE 488 2 Standard 5 lt NL gt 6 lt END gt Notes All settings other than TERM 4 are technically out of compliance with IEEE 488 2 specifications However they are provided for flexible compatibility with various GPIB drivers TERM 3 will often cause bus hang problems because IEEE 488 2 compliant instruments ignore the lt CR gt as white
48. es the service request enable register when a device condition summary or an error is available March 2013 46 FPM 8220 SRE Service Request Enable Query Action Parameters Notes Examples STB Status Byte Query Action Parameters Notes Examples TST Self Test Action Parameters Notes Examples WAI Wait to Continue Action Parameters Notes Examples March 2013 Common Device Dependent Front Panel Returns the enabled bits in the Service Request Enable Register None The response is the sum of the enabled bits and must be a value between 0 and 255 Refer to Figure 3 5 in Chapter 3 for a complete description of the Status Byte and Service Request Enable Register SRE response 136 specifies that the device condition summary and error available bits are enabled Common Device Dependent Front Panel Returns the value of the Status Byte Register None The response is the sum of the enabled bits and must be a value between 0 and 255 Refer to Figure 3 5 in Chapter 3 for a complete description of the Status Byte and Service Request Enable Register STB response 200 specifies that the device condition summary master status summary and error available bits are enabled Common Device Dependent Front Panel Performs an internal self test then reports results None Response 0 test completed with no errors Response non zero test not c
49. evious 100 measurements Filt Response FASTmeans measurement averaging is off and the display is updating every 0 05 seconds MESsage lt ASCII string gt Common Device Dependent Front Panel Action Stores an ASCII string into FPM 8220 non volatile memory Notes String is 1 to 16 non zero ASCII characters Strings longer than 16 characters are terminated to the first 16 Strings shorter than 16 characters are filled with spaces to 16 Message string is retained through power OFF ON Useful as a scratchpad for storing intermediate test status or configuration information Examples Message Test 3 Stores the string Test 3 in non volatile memory Message Test 3 Same as above Quotes are optional MESsage Common Device Dependent Front Panel Action Requests an ASCII string from FPM 8220 message memory Response 16 character string followed by NULL terminator Notes As necessary the string is filled with spaces to 16 character length If no message string was stored the response is a string of 16 spaces Examples Message Response Test 3 means the previously stored message was Test 3 MODE DB Common Device Dependent Front Panel Action Selects Decibels dB relative to the reference value to be used in reporting measurements Notes MODE defines the units of value that will be used for responses to a POW request This command has the same effect as selecting the display mode on the front panel Examples Mode dB
50. for a response either set the GPIB time out longer or use SRQ generated interrupts See the GPIB interface manual for time out configuration or SRQ programming setup The OPC OPC and WAI commands should not be used inside a calibration routine March 2013 37 FPM 8220 Command Timing 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 the first is being executed or if it must wait until the first command is completed before its execution begins See the Operation Complete Definition earlier in this chapter for conditions about setting the operation complete flag Sequential Overlapped Commands All device dependent commands are executed in an overlapped manner subsequent commands may begin before the current command has completed Some common commands are sequential the next command must wait until this command has completed All device dependent commands are executed in an overlapped manner except the DELAY command which is sequential The operation complete flag is set after the conditions outlined in the Operation Complete Definition have been satisfied WAI is an example of a sequential command which forces the next command to wait until the no operation flag is true This is essentially the same as waiting for the OPC flag to become true because the no operations pending flag i
51. g error results when there is too much ambient light for the zero operation The FPM 8220 keeps the last zero setting even when you turn power OFF So if you zero the meter to your test setup be sure to zero the meter again when you are finished It may be more convenient to do this with the front panel ZERO button After ZERO you should confirm completion with ZERO Then check the error queue see ERRors before proceeding You can interrupt the zero process from the front panel even if it was initiated by GPIB by pressing the front panel ZERO button before it completes If the zero process is interrupted or was not successful gain offsets for the remaining unzeroed gain ranges remain unchanged ZERO Start the zero process for all ranges ZERO 2 Zeros range 2 59 FPM 8220 ZERO Common Device Dependent Front Panel Action Requests status of the FPM 8220 zero operation Response 0 zero operation is not in progress 1 zero operation is in progress Examples ZERO Response 1 means the zero operation is in progress Zero Response 0 means the zero process is not in progress If you just issued a ZERO command this confirms the process is complete DISPlay BRIGhtness lt nrf value gt Common Device Dependent Front Panel Action Set the display brightness Parameters 1 to 10 Examples DISPlay BRIGhtness 10 Set the display to the highest brightness DISPlay BRIGhtness Common Device Dependent Front Panel A
52. ghtwave Customer Support You may contact us in whatever way is most convenient Phone 800 459 9459 or 406 586 1244 Fax 406 586 9405 On the web at 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 i ie 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 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 March 2013 ix FPM 8220 This page was intentionally left blank March 2013 x FPM 8220 Chapter 1 Introduction and Specifications This chapter is an introduction to the FPM 8220 Fiber Optic Power Meter and the FMH 8705 FMH 8715 and FMH 87107 Fiber Optic Measurement Heads This chapter also includes y Safety considerations and instructions Y Product Overview Y
53. ging Update Rate ADC Integration Time SLOW 5 seconds 145 milliseconds MEDIUM 9 milliseconds FAST 9 milliseconds CAL Zero Display Pressing CAL initiates the calibration measurement function which multiplies every measurement by a calibration factor The range of calibration is 0 500 to 2 500 The default value is 1 000 The LED above the CAL pushbutton will illuminate for any value other than 1 000 Use the UP ARROW and the DOWN ARROW to adjust the calibration factor Pressing ZERO initiates the meter zero function Increasing dashes in the numerical part of the display along with a Zeroing enunciator in the parameter line of the display shows the function s status Dependent on auto manual mode the 8220 will zero the current gain range or all gain ranges accordingly Pressing DISPLAY cycles the bottom dot matrix display from the instrument s setting information to the brightness of the display to a bar graph 9 FPM 8220 March 2013 Display The bottom dot matrix display can show the instrument s setting information the display s brightness or a bar graph Setting Information Displays from left to right wavelength filter speed and gain range auto The far right will display gain range if in manual mode or Auto if auto gain range f Set Wavelength Filter Speed Gain Range Figure 2 2 Setting Information in Manual Mode f fof Set Wavelength Filter Speed Gain Range Figure 2 3
54. he User s Guide Fiber Optic Power Meter FPM 8220 IO Lig nian A Newport Corporation Brand ILX Lightwave Corporation 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 ilxlightwave com 70044002 March 2013 Table of Contents Safety Information and the Manual cccccccccccccccncccccncnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnos V General Safety CONSI AMOS deccercccnccesecenccesecenccepecenceegacenecesacenerevecenecenacenerevecenarenerenecert Vv Safety SYMONS rte ratita vi Safety Marking Symbols us vii ACI A A EEA a ara danai vii LIMITAN Si AA A A A et ee ee vii Returning ar AS A ane E A neces viii Claims for Shipping Damage earen REE AEREE narran rra viii Comments Suggestions and Problems ocooooconcccccncncncnnnnnnnnncnnnnnnnnononnnnnnnncnnnnnnnnnnnnnns ix Chapter 1 Introduction and Specifications ooooonccccccnnncccccccnno 1 Safety Considera el OEA ies 1 Product Overvie Wsie n dd a dd a ad a e el el e ad e o e ad 1 Options INOACCESSOMO Sissi AA A A A A EEEE EEEE 3 SpecifIcatiONS ereere ee eree ee e e eree eere e E Era er 4 Chapter 2 General Operation oooccccoooooccccccccnoncccncnnnooccnnnnnnnnccnnnnnnnns 5 Installation 2d acta ayia toy jo Jone ti ito ii todos fala toe 5 Grounding Requirements ctaciciidonaccic a dd a dada dat 5 AC Line Power Requirement i a
55. ight data I O DIO lines carry both data including device dependent commands and interface messages The ATN interface management line determines whether these lines contain data or interface messages O DIO1 DIOS DIO2 cm DIO6 DIO3 DIO7 DIO4 HHH DIO8 EOI REN DAV m GND Twisted pair with DAV NRFD A GND Twisted pair with NRFD NDAC EE AE GND Twisted pair with NDAC IFC H GND Twisted pair with IFC SRQ EA KI GND Twisted pair with SRQ ATN GND Twisted pair with ATN SHIELD SIGNAL GROUND Figure 3 2 GPIB March 2013 25 FPM 8220 Three handshake lines ensure that all data and messages are reliably transferred NRFD not ready for data indicates whether a device can receive the next byte of data or message NDAC not data accepted indicates whether a receiving device has accepted a byte of data or message DAV data valid indicates that the signal levels on the data lines are stable and available for the receiving device s to accept Five interface management lines control the flow of information ATN attention is set by the controller in charge to define the I O lines for data or interface messages IFC interface clear is set by the system controller to initialize the bus and assert itself as controller in charge REN remote enable is set by the controller to place addressed devices into remote or local front panel control mode SRQ service request can be set by any device in the system to re
56. ing the terminating character Check that total GPIB cable length is less than 20 meters Remove all other instruments from the bus to isolate the FPM 8220 If this corrects the problem re connect one instrument at a time until the problem returns Then check the other instrument for address conflicts and proper GPIB function Is the FPM 8220 ANSI IEEE 488 2 The FPM 8220 is IEEE 488 2 compliant compatible Problems using the Device Clear The DCAS interrupt is not connected to the necessary microprocessor for clearing bus hung conditions via Device Clear The firmware does not terminate or complete all commands upon a Device Clear because of firmware hardware timing issues and GPIB USB architecture Instrument is reading NO HEAD The instrument reads NO HEAD CONNECTED if it cannot CONNECTED locate a compatible head Confirm that the connected head is an FMH 8700 and that the connector is secure If the instrument still does not recognize the head check that there are no bent pins in the connector If there are straighten the pin with needle nose pliers to ensure that it does not re bend March 2013 70 FPM 8220 Optical Measurement Problems Symptom Corrective Action Inconsistent readings Make sure the connector adaptor is flush with the head Verify the quality of cleave and the placement in the bare fiber holder Rotate the connector adaptor until alignment pin snaps into place Verify the fiber
57. librated attenuator You can then use CAL to set a compensating factor Understanding the Calibration Certificate Your FPM 8220 and FMH 8700 are supplied with a certificate for NIST traceable calibration from ILX Lightwave s calibration laboratory The following section explains the information on your calibration certificate Photodetector Responsivity The FPM 8220 Fiber Optic Meter is a stable low noise current meter that is compatible with three fiber optic measurement heads the FMH 8705 the FMH 8715 and the FMH 87107 The FMH 8705 is a detector only fiber optic measurement head design to measure very low power The FMH 8715 and FMH 87107 are integrating sphere based fiber optic measurement heads with an integrated photodetector The integrating sphere randomizes light input so changes in input polarization and pattern orientation have little net effect on the detector Factory calibration data is stored in the internal EEPROM of the FMH 8700 series Fiber Optic Measurement Head Factory calibration is a process of recording the detector current while March 2013 17 FPM 8220 varying the wavelength The result is a table of detector responses recorded every 10 nanometers in A per W When you input light the FMH 8700 series of Fiber Optic Measurement Head measures detector current then uses your wavelength setting to look up the conversion factor on the calibration table Interpolation algorithms are used for wavelengths between these
58. ll serial poll capability with SRQ Full local remote capability This chapter explains GPIB and USB concepts system setup and command syntax Chapter 4 is a reference guide of FPM 8220 responses to remote commands This chapter assumes Your computer has an appropriate GPIB interface or the instrument is connected via USB 2 0 You have a basic knowledge of programming or have informational sources at your disposal You are familiar with the front panel operating controls on the FPM 8220 Chapter 2 GPIB interface adaptors and support software for standard desktop PCs are available from several manufacturers Contact ILX Lightwave Customer Service for more information January 2013 23 FPM 8220 Basic GPIB Concepts The basic GPIB concepts are not necessary to successfully operate the FPM 8220 but are a useful perspective in understanding GPIB communication Data and Interface Messages GPIB devices communicate with each other by sending data and interface messages Data contains device specific information such as programming instructions measurement results and instrument status Each device has an address number and ignores all data traffic not addressed to it Depending on its content data is often called a device dependent message or a device dependent command Interface messages manage the bus with functions such as initializing the bus and addressing or unaddressing devices In addition some individual bus lines a
59. minal Terminal 1 On in position of bistable push control Off Out position of a bistable push control The slash only denotes that mains are on EL The circle O only denotes that mains are off 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 March 2013 vii FPM 8220 Returning an Instrument If an instrument is to be shipped to ILX Lightwave for repair or service be sure to Repairs are made and the instrument returned transportation pre paid Repairs are warranted for the Obtain a Return Authorization number RA from ILX Customer Service Attach a tag to the instrument identifying the owner and indicating the required service or repair Include the instrument seri
60. nicate GPIB Response 12 means that the GPIB address is set to 12 SYSTem ERRor Common Device Dependent Front Panel Action Requests the current error in the error queue and then removes this error from the error queue Parameters None Response ASCII character string Error number and error description separated by commas Notes See Appendix A for a list of error numbers Examples SYSTem ERRor Response 0 No error means no errors to report SYSTem ERRor Response 530 Measurement head error means the head is not connected March 2013 65 FPM 8220 March 2013 66 FPM 8220 Chapter 5 Troubleshooting This chapter is to help you resolve problems quickly If you need help contact ILX Lightwave Customer Service See page viii for contact information ILX Lightwave Corporation provides in house and on site calibration services for ILX instruments Most ILX instruments including the FPM 8220 require yearly calibration to ensure performance to published specifications ILX factory calibrations employ NIST traceable measurement instrumentation and our calibration engineers and technicians use automated test equipment to accurately and efficiently capture and record calibration data An original certificate of calibration authenticity is provided with all instrument calibrations and a detailed report showing any pre calibration out of tolerance conditions is available upon request Calibration turn times are normally five busines
61. nses with lt NL gt lt END gt unless the TERM command is used to change it If problems are encountered with remote communication the terminator string can be the cause Refer to the computer s GPIB or USB interface manual for information on configuring its terminator string Command Separators More than one command may be placed in the same command string if each command is separated by a semicolon The semicolon can be preceded by one or more spaces For example DISPLAY ON IDN RANGE DISPLAY ON IDN RANGE Parameters Some commands require a parameter The parameter must be separated from the command by at least one white space The syntax symbol lt nrf value gt refers to the flexible numeric representation defined by the GPIB standard It means that numbers may be represented in integer or floating point form or in engineering scientific notation The IEEE 488 2 standard uses the names NR1 NR2 and NR3 respectively to denote integer floating point and scientific notation For example the number twenty may be represented by any of the following ASCII strings Table 3 4 Parameters Integer 20 20 NR1 Floating Point 20 0 20 0 NR2 er er 2 0E 1 2 0E 1 Scientific Notation 2 0e 1 2 0e 1 NR3 For more information on these definitions refer to the IEEE 488 2 standard There are no default values for omitted parameters If a command is expecting a parameter an
62. ntage of full scale For example 7 1V 71 of range This information is represented by the bar graph on the front panel but with greater resolution Since the resolution is mostly determined by the instrument that you connect it to this output is useful for monitoring small changes With a typical output impedance of 1000Q you can directly connect the meter to most data loggers or digital voltmeters The analog March 2013 18 FPM 8220 output is most commonly used for relative power measurements or as a controlling input for automatic fiber alignment systems For such tests the absolute value represented by the analog output voltage is usually not of concern only the change relative to a starting point For monitoring relative power measurements put the meter in auto mode to find the appropriate gain range then set the meter to manual mode to avoid changing gain ranges during the test Gain Range Boundaries Understanding how the gain ranges and detector response relate to analog output can be useful in interpreting analog voltage The gain range is related to the current from the photodetector not to the direct light power because the semiconductor photodetector response varies with wavelength The FPM 8220 meter has eight gain ranges Each range increases gain by 10 times over the previous range The analog output varies O V to 10 V representing minimum to maximum current output for that range The maximum current for each range is 0
63. ode Power Response of DBM 13 584 means the last measured power was 13 584 dBm MODE W POW Response 2 795E 006 means the last measured power was 2 795 uW 54 FPM 8220 RADix lt nrf value gt Common Device Dependent Front Panel Action Sets the form radix of numeric responses Rad DEC Decimal numbers Default type when not specified Rad HEX Hexadecimal numbers Rad BIN Binary numbers Rad OCT Octal numbers Notes All status condition and event requests respond in the selected radix RADix defines responses not data entry To enter data in non decimal form use one of the following prefixes H Hexadecimal 0 Octal B Binary Examples RAD DEC Reset to the factory default decimal radix Radix HEX ESR Set hexadecimal radix Response H80 means power on was detected rad oct Set octal radix RADix Common Device Dependent Front Panel Action Requests the current form radix of numeric responses Responses Dec Decimal numbers Default type Hex Hexadecimal numbers Bin Binary numbers Oct Octal numbers Notes Use the RADix command to change the radix setting Examples Radix Response Hex means numeric responses will be in hexadecimal numbers RANge lt nrf value gt Common Device Dependent Front Panel Action Sets the FPM 8220 photodetector current gain range Parameters O through 8 Notes The InGaAs photodetector in the FPM 8220 converts optical power into electrical current The FPM 8220 is a stable low noise
64. ompleted or completed with errors TST response 0 means test completed without errors Common Device Dependent Front Panel Prevents the instrument from executing any further commands until OPC operation complete status is true None This command can be used to make the instrument wait until an operation is complete before continuing Care should be taken to set the GPIB time out appropriately for use with the WAI command After this command or the Delay command is sent the instrument may receive up to 20 more commands before the wait period is over WA action wait until OPC status is true 47 FPM 8220 CAL USER lt nrf value gt Common Action Parameters Indicators Examples CAL USER Action Response Examples COND Action Notes Examples March 2013 Device Dependent Front Panel Sets a gain factor to be applied to all FPM 8220 measurements 0 500 to 2 500 Front panel USER CAL indicator is ON when the gain factor is any other value than 1 000 CAL USER 5 Results are half their normal value CAL USER 1 01 Results are increased by 1 Common Device Dependent Front Panel Requests the FPM 8220 user cal gain value A value between 0 500 and 2 500 CAL USER Response 1 000 means there is no user calibration gain factor CAL user Response 1 010 means a user calibration gain factor is increasing all results by 1 Common Device Dependent Front Panel
65. on Standard Event Status Enable Device Dependent Front Panel Action Enables bits in the Standard Event Status Enable Register Parameters The value must be between 0 and 255 Notes Bit 5 of the Status Byte Register STB is set if any enabled conditions are true Setting Bit O allows for generation of service requests from overlapped commands as previous operations complete This may be useful for ensuring that an operation is complete before starting a measurement Standard Event Status Register ESR 7 Te 5 4 5 2 11 10 0 Operation Complete amp 3 1 Request Control gt mM 2 Query Error amp 3 Device Dependent 6 Error yal i QX 4 Execution Error E 5 Command Error 6 User Request Je s s 3 2 1 Jo Poweron Standard Event Status Enable Register ESE lt nrt gt ESE Examples ESE 40 action Sets the Standard Event Status Enable Register to enable Bit 5 of the Status Byte January 2013 Register if a device dependent error or a command error occurs 40 2 2 42 FPM 8220 ESE Standard Event Status Enable Query Action Parameters Notes Examples ESR Standard Event Status Register Query Action Parameters Notes Examples March 2013 Common Device Dependent Front Panel Requests the value of the Standard Event Status Enable Register None Bit 5 of the Status Byte Register is set if any enabled conditions are true Response is the sum of the enable
66. ower case does not matter to the FPM 8220 It is just used in this manual to identify optional letters The optional letters must be in the correct sequence Some examples of what works and what does not Table 3 1 Acceptable and Not Acceptable Spelling Acceptable Not Acceptable DISP DS DISPlay or DISPLAY Displa or DISPL White Space White space is normally the space character space bar A single white space must separate a command from its parameters or data For example Table 3 2 White Space Acceptable Not Acceptable WAVE 1234 WAVE1234 To enhance readability one or more white spaces may be used before a comma semicolon or terminator Since the computer normally places the terminator at the end of each command string this simply means that an extra space character at the end of the command line is acceptable A query has no space between the mnemonic and the question mark For example Table 3 3 Query Formatting Acceptable Not Acceptable DISPLAY DISPLAY March 2013 29 FPM 8220 Terminators A program message terminator identifies the end of a command string These are the valid terminator sequences lt NL gt lt END gt lt NL gt lt END gt Many computers terminate with lt CR gt lt NL gt lt END gt Carriage Return New Line EOI A carriage return lt CR gt is read as white space The FPM 8220 terminates its respo
67. p press STORE followed by the UP ARROW or the DOWN ARROW and select bin number 1 through 10 Then press ENTER Whether or not you save the instrument s settings before powering down they will return exactly as they were the last time the instrument was used when the FPM 8220 is rebooted March 2013 21 FPM 8220 March 2013 22 FPM 8220 Chapter 3 Remote Operation This chapter is an overview of the remote operation of the FPM 8220 Fiber Optic Power Meter Y Applying power Connecting to the instrument Y Front panel operation GPIB General Purpose Interface Bus is the common name for ANSI IEEE Standard 488 an industry standard for interconnecting test instruments in a system The FPM 8220 also has USB Universal Serial Bus so that the instrument can be connected to a computer without a GPIB card Every operation that you can perform from your FPM 8220 front panel can also be done remotely through the rear panel GPIB or USB interface In addition some features are available only through remote operation For example the DELAY command automatically sets a delay time before the execution of further commands Remote control can be useful for building an automated test system that includes other instruments It is also useful for structuring and collecting data for longer tests such as environmental and component burn in tests Remote Operation Features A concise and straightforward command set Full talk listen capability Fu
68. quest service from the controller EOI end or identify is used by talkers to identify the end of a message March 2013 26 FPM 8220 Configuring the GPIB Controller Refer to your computer s GPIB interface documentation for details on how to set it up These settings are important Primary GPIB Address 1 through 30 Secondary GPIB Address NONE Timeout 1 second Serial Port Timeout 1 second Terminate Read on EOS No Set EOI with EOS on Writes Yes Type of Compare on EOS 7 bit EOS Byte 00h Please note that overlooking these settings is a common cause of problems Changing Operation from Local to Remote Sending a command over the GPIB or USB bus automatically puts the instrument in remote mode which is indicated by the RMT in the upper right corner of the display When the instrument is in remote mode all front panel controls are disabled except for the RECALL button Pressing the RECALL button returns the instrument to local control mode unless the local lockout state has been activated by the host computer Local lockout disables all front panel controls including the RECALL button until this condition is changed by the host computer Setting the GPIB Address In local mode press RECALL and the UP ARROW buttons simultaneously to display the GPIB address While the GPIB address is displayed you can change it to any of 30 addresses from 01 to 30 by pressing the UP ARROW or the DOWN ARR
69. r more information Safety Symbols This section describes the safety symbols and classifications Technical specifications including electrical ratings and weight are included within the manual 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 lt 80 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 March 2013 vi FPM 8220 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 components Caution refer Earth ground Al hee jr to manual Terminal NU ternating current er e aser radiation Caution risk of perenne Caution Frame or chassis electric shock Goniductor hot surface ter
70. r over time dust and pollution in the air can degrade measurement accuracy After using the head protect the cavity by covering the aperture with the plastic shipping protector place the head face down on the table or leave a connector or bare fiber holder in place Cavity contamination can also happen if you are doing environmental testing where humidity causes condensation If you suspect the cavity has been contaminated contact ILX Lightwave Customer Service In most cases we can clean it and recalibrate it for you Also contact ILX Lightwave Customer Service if a replacement protective cap is needed See Comments Suggestions and Problems on page viii for contact information Measurements through a Connector With the adaptors available from ILX Lightwave the FMH 8700 series Fiber Optic Measurement Heads can make measurements through most common fiber optic connectors To install an adapter 1 Align the mating hole on the connector with the alignment pin on the head 2 Press it into place then rotate it slightly until the alignment pin has seated Make sure the adapter is fully seated around its circumference Figure 2 6 Seating the Alignment Pin Small spring loaded balls ball plungers in the side of the adaptor mate with a channel in the FMH 8700 series Fiber Optic Measurement Heads to hold the adaptor in position Once the adaptor is in place you can connect fibers repeatedly to the meter There is no need to remove th
71. r the FPM 8220 limits the amount of offset because large external influences are too unstable to include in measurements Error Zeroing error results when there is too much ambient light for the zero operation The FPM 8220 keeps the last zero setting even when you turn power OFF So if you zero the meter to your test setup be sure to zero the meter again when you are finished It may be more convenient to do this with the front panel ZERO button After ZERO you should confirm completion with ZERO Then check the error queue see ERRors before proceeding You can interrupt the zero process from the front panel even if it was initiated by GPIB by pressing the front panel ZERO button before it completes If the zero process is interrupted or was not successful gain offsets for the remaining unzeroed gain ranges remain unchanged Examples SENSe CORRection COLLect ZERO Start the zero process for all ranges SENSe CORRection COLLect ZERO 2 Zeros range 2 SENSe CORRection COLLect ZERO Common Device Dependent Front Panel Action Requests status of the FPM 8220 zero operation Response 0 zero operation is not in progress 1 zero operation is in progress Notes Since the OPC flag is held false during the zero process zero status can also be determined by checking OPC status See OPC Examples SENSe CORRection COLLect ZERO Response 1 means the zero operation is in progress SENSe CORRection COLLect ZERO Response 0 mean
72. rameters Function LEAN NONE Calibrate internal analog to digital A D converter CLS NONE Resets the Standard Event Register Status Byte and Error Queue to zero ESE 1 Sets the Standard Event Status Enable Register ESE NONE Returns the value of the Standard Event Status Enable Register ESR NONE Returns the value of the Standard Event Status Register IDN NONE Returns the Device Identification string OPC 4 Generates the Operation Complete message in the Standard Event Status Register OPC NONE Places an ASCII character 1 into the Output Queue PSC 1 Used to avoid any undesirable service requests PSC NONE Queries the Power On Status Clear Flag RCL 1 Used to recall a stored setup configuration RST NONE Forces a device reset SAV 1 Saves the current setup configuration Pee 4 Sets the Service Request Enable Register bits to allow generation of user selectable service requests SRE NONE Returns the current contents of the Service Request Enable Register STB NONE Returns the current contents of the Status Byte Register TST NONE Initiates an internal self test and returns a response when complete WAT NONE ites executing any further commands until the No Operation Pending flag March 2013 39 FPM 8220 Table 4 1 Remote Command Summary Reference List Device Specific Commands
73. range increases gain by 10x over the previous range The maximum photodetector current for each range is as follows Range Maximum Current Range Maximum Current Setting the gain range puts the FPM 8220 into MANUAL range mode Examples SENSe POWer RANGe MONitor 5 Set the photodetector current gain to range 5 100 nA full scale SENSe POWer RANGe MONitor Common Device Dependent Front Panel Action Requests the FPM 8220 photodetector current gain range Response Integer number 0 through 7 Notes See the discussion of SENSe POWer RANGe MONitor above for information about gain ranges Response is valid whether the FPM 8220 is in MANUAL or AUTO range mode Range information is not displayed on the FPM 8220 front panel Examples SENSe POWer RANGe MONitor Response 5 means photodetector current gain is to range 5 100 nA full scale March 2013 63 FPM 8220 SENSe POWer REFerence lt nrf value gt Common Device Dependent Front Panel Action Sets a reference level in dBm Parameters 30 to 120 Notes Measurements in dB are reported relative to this reference level See MODE DB is accepted but not necessary for positive values Front panel operation allows you to set the reference to the most recent measurement However the GPIB command allows you to set any arbitrary reference level Examples SENSe POWer REFerence 0 Set reference level to 0 dBm 1 mW SENSe POWer REFerence 18 24 Set reference level to 18 24 dBm 15 yW
74. re designated for this purpose see below The end of this chapter includes information on interface messages supported by the FPM 8220 Talkers Listeners and Controllers Every GPIB system consists of one or more talkers listeners and often at least one controller Talkers supply data and listeners accept data Controllers designate talkers and listeners A controller is necessary when the active talkers or listeners must be changed When the controller is a computer it often also designates itself as a listener so it can collect data from designated talkers If there is more than one controller only one can be the Controller In Charge CIC Control can be passed from one computer to another In a multiple controller system there can be one System Controller capable of asserting control and becoming the CIC GPIB Cable Connections Standard GPIB connectors can be connected together stacked allowing the system to be configured linearly or in a star configuration which is shown in Figure 3 1 March 2013 24 FPM 8220 e Linear Configuration Star Configuration Figure 3 1 GPIB Cable Connection The GPIB Connector The standard GPIB connector consists of 16 signal lines in a 24 pin stackable connector as shown in Figure 3 2 The extra pins are used to make twisted pairs with several of the lines There are eight data input output lines three handshake lines and five interface management lines E
75. rking in a dark environment Examples DISPLAY 0 Turn off the front panel display Disp enab 1 Enable the front panel display DISPlay Common Device Dependent Front Panel Action Requests the front panel display status Response Returns the display status 0 means OFF and 1 means ON Examples DISPLAY Response 0 means the display is currently shut off Disp Response 1 means the display is in normal state March 2013 49 FPM 8220 ENABle COND lt nrf value gt Common Device Dependent Front Panel Action Enables bits in the device condition status enable register Paramters 0 to 65535 Numeric t Value Over range 4 Under range 8 Measurement data ready 2048 Unused bits Notes Enabled disabled conditions can be read by ENABIe COND Changing condition status may be monitored by COND Bit 3 of the status byte register is set if any device enabled conditions are true See Chapter 3 for more information about register structure Enable registers normally retain their values through power OFF ON unless the power on status clear flag is set true See PSC Examples ENAB COND 12 Enables the condition status register so that over range and under range error conditions are summarized in the status byte bit 3 8 4 12 Enable cond HC Same as ENAB COND 12 except using hexadecimal numbering See RADIx
76. rom the system controller is connected to the FPM 8220 If you are using GPIB the cable should be less than 3 meters 10 feet long Press RECALL and the UP ARROW at the same time to display the GPIB address for three seconds If it is not correct change it by pressing the UP ARROW or the DOWN ARROW until you see the correct address Check that your controlling software is sending commands to the correct GPIB address or with the correct terminating character Check that no two devices are set to the same GPIB address Make sure that there are less than 15 devices on the bus Check that total GPIB cable length is less than 20 meters 65 feet Check the configuration of your GPIB controller card or COM port Specifically note the information regarding the terminating character Remove all other instruments from the GPIB bus to isolate the FPM 8220 If this corrects the problem re connect one instrument at a time until the problem returns Then check the other instrument for address conflicts and proper GPIB function Read the error queue remotely ERR The command syntax or command structure may be in error Read the status byte STB and condition register COND for possible device problems Check that no two devices are set to the same GPIB address Make sure that there are less than 15 devices on the bus Check the configuration of your GPIB controller card or COM port Specifically note the information regard
77. ropriate gain range You can then select AUTO MAN again if you want to lock it into one range manually If you see an OVER indication in auto range mode or in the highest range lowest gain the optical power input is beyond the FPM 8220 s upper limit If you see an OVER indication in manual range mode then the optical power input is greater than 97 5 of full scale for the current gain range Display shows Not enough optical power input for the range Press the DOWN ARROW to change the gain range or select AUTO MAN the auto indicator is on in the display to automatically select an appropriate gain range You can then select AUTO MAN again if you want to lock it into one range manually If you see a LOW indication in auto range mode or in the lowest range highest gain the optical power input is below the FPM 8220 s lower limit If you see a LOW indication in manual range mode then the optical power input is less than 5 0 of full scale for the current gain range The instrument reads Internal E 532 is the internal communication error indicating the Communication Error FPM 8220 platform is not functioning correctly The instrument must be returned to ILX Lightwave if this error occurs March 2013 68 FPM 8220 No response from a remote command and the RMT indicator is off Slow or unexpected response to remote commands March 2013 69 FPM 8220 Check that a GPIB or USB A B cable f
78. rrupts after power on Examples PSC 0 Disable automatic power on clearing of the enable registers PSC 1 Enable automatic power on clearing of the enable registers PSC Common Power on Status Clear Query Device Dependent Front Panel Action Requests the status of the power on status clear flag Parameters None Notes Response 0 The enable registers are saved through power off on 1 The enable registers are cleared during power on Registers affected Device Condition Status Enable Service Request Enable Device Event Status Enable Standard Event Status Enable See Chapter 3 for more information on register structure Examples PSC Request state of power on status clear flag RCL lt nrf value gt Common Recall Device Dependent Front Panel Action Recalls a stored setup configuration from memory Parameters One lt nrf value gt with a value from 0 10 Notes Configuration 0 is the factory set default configuration If Configuration 0 is recalled via GPIB the instrument will be in Remote mode If it is recalled from the font panel the instrument will be in Local mode The SAV function is used to save configurations for convenient recall The current setup is automatically stored and recalled at the next power on unless PSC is used to enable the power on status clear flag Examples RCL 0 response instrument is reconfigured to factory default settings March 2013 45 FPM 8220 RST Common Reset Device Dep
79. s Each of these interface descriptors define a number of endpoints which are the sources and destinations for data transfers The endpoint descriptors provide the following detail transfer type bulk interrupt isochronous direction packet sizes bandwidth requirement and repeat interval In USB communication a typical transaction consists of a number of packets a token indicating the type of data that the host is sending or requiring the data and in some cases an acknowledgement Each packet is preceded by a sync field and followed by an end of packet marker These transactions are used to provide four basic data transfer mechanisms including control interrupt bulk and isochronous types USBTMC stands for USB Test and Measurement Class USBTMC is a protocol built on top of USB that allows GPIB like communication with USB devices From the user s point of view the USB device behaves just like a GPIB device For example you can use VISA Write to send the IDN Query and use VISA Read to get the response The USBTMC protocol supports service request triggers and other GPIB specific operations USBTMC allows instrument manufacturers to upgrade the physical layer from GPIB to USB while maintaining software compatibility with existing software such as instrument drivers and any application that uses VISA GPIB vs USB Communication When using the USB interface the remote GPIB command set is fully operable Command syntax does not vary be
80. s days or less On site calibrations can be performed around your production schedule night or day seven days a week Please contact ILX Customer Support see Comments Suggestions and Problems on page viii for contact information for additional calibration information For further assistance with technical solutions and troubleshooting visit us online at www newport com ilxlightwave January 2013 67 FPM 8220 Troubleshooting Guide This section lists some common problems and corrective actions The corrective actions may not solve the problem in which case you should contact ILX Lightwave For a comprehensive list of frequently asked questions see the ILX Lightwave website or contact ILX Lightwave Customer Service see Comments Suggestions and Problems on page viii for contact information Symptom Corrective Action The instrument does not power up Check the power cord to make sure that it is properly connected and check the wall outlet by connecting to operational instrument The display reads Zeroing Error Error message E 531 normally indicates that there is too much environmental light to properly zero the meter The detector head must be connected to a fiber and the source s output must be turned off Display shows OVER There is too much optical power input for the range Press the DOWN ARROW to change the gain range or select AUTO MAN the auto indicator appears in the display to automatically select an app
81. s the zero process is not in progress If you just issued a SENSe CORRection COLLect ZERO command this confirms the process is complete SENSe POWer RANGe AUTO lt nrf value gt Common Device Dependent Front Panel Action Sets the FPM 8220 into AUTO or MANUAL ranging mode Values 0 MANUAL ranging 1 AUTO ranging Notes Same function as pressing AUTO MAN on the front panel Examples SENSe POWer RANGe AUTO 1 Set the FPM 8220 into AUTO ranging mode SENSe POWer RANGe AUTO 0 Set the FPM 8220 into MANUAL ranging mode March 2013 62 FPM 8220 SENSe POWer RANGe AUTO Common Device Dependent Front Panel Action Requests the status of AUTO or MANUAL range mode Response 0 MANUAL ranging 1 AUTO ranging Notes This information is available on a front panel indicator Examples SENSe POWer RANGe AUTO Response 1 means the FPM 8220 is in AUTO ranging mode SENSe POWer RANGe MONitor lt nrf value gt Common Device Dependent Front Panel Action Sets the FPM 8220 photodetector current gain range Parameters 0 through 8 Notes The InGaAs photodetector in the FPM 8220 converts optical power into electrical current The FPM 8220 is a stable low noise current meter that uses calibration to report photodetector current as optical power This current is proportional to optical power but it also varies with wavelength For more information about gain ranges see Gain Ranges on page 18 There are eight ranges in the FPM 8220 meter Each
82. s used to set the OPC flag bit O of the Standard Event Status Register Commands which change the status of the instrument limits or change its mode step value or status enable registers will not have their OPC flag set until all current writing to non volatile memory has been completed This ensures the OPC flag is never set prematurely Query Response Timing Query responses are evaluated at the time the query request 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 small March 2013 38 FPM 8220 Chapter 4 Command Reference This chapter is a guide to all of the device dependent commands for the FPM 8220 Fiber Optic Power Meter This chapter is divided into two parts Y Overview of the remote commands Y List of remote commands in alphabetical order within the categories of IEEE 488 2 common commands device specific commands and extra commands Remote Command Reference Summary This section contains all of the commands for the FPM 8220 Fiber Optic Power Meter listed in alphabetical order Subsections for each path are presented listing the commands which are legal for that path See Figure 3 3 for the command path tree structure Table 4 1 Remote Command Summary Reference List IEEE 488 2 Common Commands and Agilent compatible commands Name Pa
83. space causing them to wait indefinitely for message termination Meanings of the acronyms are historical CR Carriage Return e g a mechanical typewriter NL New Line e g line feed on a line printer AEND EOI code End Or Identify Examples Term 4 Define the message terminator as the IEEE 488 2 standard lt NL gt lt 2END gt March 2013 57 FPM 8220 TERM Action Response Notes Examples TIME Action Response Notes Examples TIMER Actions Response Notes Examples March 2013 Common Device Dependent Front Panel Requests the currently defined message terminator 0 through 6 interpreted as follows 0 lt CR gt lt NL gt lt END gt 1 lt CR gt lt NL gt 2 lt CR gt lt END gt 3 lt CR gt 4 lt NL gt lt END gt IEEE 488 2 Standard and FPM 8220 default 5 lt NL gt 6 lt END gt All settings other than TERM 4 are out of compliance with IEEE 488 2 specifications They are provided for flexible compatibility with various GPIB drivers See TERM above for more information Term Response 4 means the message terminator is the FPM 8220 default lt NL gt lt END gt Common Device Dependent Front Panel Requests the time since the last time the FPM 8220 was powered ON ASCII character data in the form hours minutes seconds Maximum time clock turns over is1193 hours 50 days The TIME clock is independent of the TIMER clock See TIMER below
84. summarized in the status byte bit 2 Enable event H4 Same as ENAB EVE 4 except using hexadecimal numbering See RADix ENABle EVEnt Common Device Dependent Front Panel Action Requests the value in the device event status enable register Response a value between 0 and 65535 Numeric t Value Over range 4 Under range 8 Measurement data ready 2048 Unused bits Notes Enabled disabled events can be set by ENABIe EVEnt Changing event status may be monitored by EVEnt See Chapter 3 for more information about register structure Examples ENAB EVE Response 2048 means that measurement ready will be reported in status byte bit 2 March 2013 Enable event Response H800 is the same as 2048 except using hexadecimal numbering See RADIx 51 FPM 8220 ERRors Common Device Dependent Front Panel Action Requests a list of errors which have occurred since the last ERR request Parameters None Response ASCII character string list of error numbers separated by commas Notes 0 no errors reported See Appendix A for a list of error numbers Examples ERR Response 0 means no errors to report Errors Response 530 means the measurement head is not connected EVEnt Common Device Dependent Front Panel Action Requests the value in the device event status register Response A value between 0 and 65535 Numeric Value Over range 4 Under range 8 Measurement data ready 2048 Unused bits Notes Enabled disabled events can be se
85. surement head s serial number and calibration date If the measurement head is not connected the display shows No Head Connected Each display lasts 2 3 seconds During the front panel indicator test the FPM 8220 performs a self test to ensure that internal hardware and software are communicating If the FPM 8220 cannot successfully complete the test an error message is displayed See Appendix A for a complete list of error messages After the self test FPM 8220 configuration is set to the same state as when power was last turned off If you wish you can use the recall function to quickly get to a different configuration See Store and Recall for more information Firmware Upgradeability The firmware on the FPM 8220 can be reinstalled or upgraded via USB 2 0 by contacting the ILX Lightwave team at support ilxlightwave com GPIB Communication The IEEE 488 2 GPIB interface connector is located on the rear panel directly above the power input See Figure 1 2 on page 2 The 24 pin connector is tapered to ensure proper orientation of the GPIB cable Use fingers to tighten the two screws on the cable connector A total of 15 devices can be connected together on the same GPIB interface bus The cables have double sided male female connectors on each end so that several cables can be stacked This allows more than one cable to be attached to any one device However the maximum length of the GPIB interface bus must not exceed 20 meters
86. t by ENABle EVEnt Status bits are set by events and cleared when read or cleared by command See CLS and EVEnt commands The measurement ready bit is set whenever the display value is updated For example in slow mode a new measurement is ready every 5 seconds See FiLTer below See Chapter 3 for more information about register structure Examples EVE Response 2052 means that over range and measurement data ready events occurred since the last EVE inquiry Event Response H804 is the same as 2052 except using hexadecimal numbering See RADix FILTer lt ASCII string gt Common Device Dependent Front Panel Action Selects measurement averaging and display update rate Parameter One of the following strings SLOW MED FAST Notes Measurement samples are taken every 50 mSec Examples FILTER SLOW Updates the display every 5 seconds with the average of 100 measurements Filter med Updates the display every 0 5 seconds with the average of 10 measurements FILT Fast Turns off measurement averaging Updates the display every 50 milliseconds March 2013 52 FPM 8220 FILTer Common Device Dependent Front Panel Action Requests the current setting for measurement averaging and display update Response One of the following ASCII character strings FAST MED SLOW Notes The filter rate is set by the front panel or by the FILTer command Examples FILTER Response SLOW means the display is updating every 5 seconds with the average of the pr
87. the responsivity of the measurement head photodiode The steps for converting analog voltage to power are as follows 1 Make sure optical power input is ON 2 Connect a voltmeter to the analog output 3 Find the range of the instrument and then look up the gain of that range in the table above 4 Lookup the photodiode responsivity in the appropriate table on the measurement head s calibration certificate 5 Divide the analog voltage by the product of the gain and the responsivity to get the power As an example suppose that we are trying to measure the power of a 1550nm laser We record the analog voltage output Vmeas at 3 5V Query the instrument to determine the gain range In this example the gain range is 3 so the gain is 10V 10pA The gain value is calculated by dividing the full scale voltage range on the instrument in combination with the heads by the maximum current boundary of gain range 3 located on the table above We then go to table 1 of the calibration certificate for the measurement head and find the responsivity of the head at 1550nm which is 6 0739E 3 A W The power of the laser is Vneas 3 5V G pa 10V A 6 0739E 3 A W 57 62nW 42 39dBm Power March 2013 20 FPM 8220 General Operation The discussion below presents guidelines for operation as well as some common operating procedures Remote operations are discussed in the next chapter Warm up and Environmental Considerations To
88. to save an instrument setup including gain range wavelength display mode filter mode and user calibration offset value in bins numbered 1 10 To save a setup first press the STORE pushbutton then use the UP ARROW and the DOWN ARROW to select the appropriate store bin and press ENTER By pressing WAVELENGTH A and using the UP ARROW and the DOWN ARROW the user can adjust the wavelength to that of the input light for accurate power measurements The wavelength adjustment range is dependent upon the FMH 8700 series Fiber Optic Measurement Head connected to the FPM 8220 When the instrument is in remote operation mode pressing the RECALL pushbutton will put the instrument back to local front panel control mode Upon receipt of a command through either the USB or GPIB interface bus the instrument automatically enters remote mode indicated by RMT in the upper right corner of the display During remote communication the front panel will be locked Pressing the RECALL pushbutton will unlock the front panel Pressing RECALL and the UP ARROW pushbuttons simultaneously will put the instrument in the GPIB address adjust mode The currently stored GPIB address will appear in the parameter line of the display Pressing the UP ARROW or the DOWN ARROW changes the address number Pressing dBm W changes the measurement dimensions from dBm to watts Pressing the button again changes the dimensions back Pressing and immediately releasing the RE
89. tween communication protocols However the commands which affect GPIB hardware operation will not be useful For example SRE may be sent via USB but and service request SRQ via GPIB would not be visible since USB has no hardware to support it This is because SRQ is a function of the GPIB interface hardware and is not available via USB All commands received by the USB interface are acknowledged by the instrument transmitting Ready when the command operation is complete Queries are acknowledged by the specific query response message Multiple commands queries separated by semicolons and issued as one command string are only acknowledged with a Ready response if the entire command string contains no queries See the Command Separators section later in this chapter for additional details March 2013 28 FPM 8220 Command Syntax The discussions below describe command syntax and structure You need this information to effectively write GPIB and USB control programs for the FPM 8220 The syntax of FPM 8220 commands follow the rules defined in the ANSI IEEE 488 standard ANSI IEEE 488 uses standard terminology To clarify understanding we use simpler terms for this manual Letters Any command or query must contain all of the letters which are shown in upper case in the command definition Some of the device dependent commands include additional optional letters shown in lower case in the command reference Chapter 4 Upper l
90. uery The condition or event registers are logically ANDed with their respective enable registers These bits are then logically ORed to form a summary message in the status byte for that particular register March 2013 36 FPM 8220 Standard Event Status Register Laser Condition Status Register ESR LASer COND isfrahafr2hho o s 7 e s 4 3 2 1110 00 Laser Current Limit 01 Voltage Limit 02 High Temp Limit 03 Laser Open Circuit 0 Operation Complete 1 Request Control 2 Query Error 3 Device Dependent Error 4 Execution Error 5 Command Error 6 User Request 04 Interlock 1 Error 05 Interlock 2 Error 06 Temp Sensor Open 07 Temp Sensor Shorted 7 Power On ais 08 Output On _ T KG 09 Bad Steinhart Hart Conversic 10 Hardware Current Limit Standard Event Status un I 11 AC Power Failure Enable Register pog KG 12 Laser Open Circuit 2 ESE lt nrf gt amp 13 Power Supply Failure 14 Power Supply Voltage Limit 15 Pass Element Power Limit Laser Condition Status Enable Register LAS ENABle COND lt nrf gt 7 i i i i i i i i i ESE i i i i i LAS ENABle COND rms Laser Event Status Register i LASer EVEnt Status Byte Register fisfizfiifiofo s 7 s s 3 2 1 00 Laser Current Limit 0 N A 01 Voltage Limit 1 N A 02 High Temp Limit 2 Laser Event Summary 03 Laser Open Circuit
91. uppercase in the command definition Optional letters shown in lowercase for some device dependent commands in the command reference Chapter 4 are useful for clarity but must be in the correct sequence A single white space must separate a command from its parameters or data White space is normally the space character space bar Other control characters are also interpreted as white space Do not use white space before the question mark in a query command If problems are encountered with communications the terminator string may be the cause Refer to the GPIB or USB interface manual for additional information The instrument accepts lt NL gt or lt AEND gt or lt NL gt lt AEND gt as a command line terminator Many computers terminate with lt CR gt lt NL gt lt END gt Carriage Return New Line EOI The instrument ignores lt CR gt Carriage Return as white space The FPM 8220 terminates its responses with lt NL gt lt 4END gt More than one command may be on the same command line if the commands are separated with semicolons March 2013 32 FPM 8220 GPIB and USB use flexible representation for numeric parameters integer floating point or engineering scientific notation There are no default values for omitted parameters Some device dependent commands are compound commands in which the first mnemonic opens a path to a set of commands relating to that path The second mnemonic then defines the actual command T

User`s Guide - Newport Corporation

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