LightWave Systems Microwave Oven Silicon Power / Wavehead User's Manual
Contents
1. Slow 16 samples Q 60 ms sample Medium 4 samples Q 60 ms sample Fast 1 sample 60 ms sample Input Bandwidth Slow 1Hz Medium 10Hz Fast 60 Hz Analog Output Specifications Analog output representing the power measurement is available at the rear panel of the multimeter Refer to the OMM 6810B Instruction Manual for details Display Left Display Power Units Linear Power Log Power pW nW LW mW W AP dBm dB Range Linear Power Log Power 0 000 nW to 999 999 W 99 999 to 99 999 dBm dB Resolution Slow Update Rate Linear Power 0 001 pW Log Power 0 001 dB Resolution Medium Fast Update Rate Linear Power 0 01 pW Log Power 0 01 dB OMH 6722B 3 CHAPTER 1 Specifications INTRODUCTION AND SPECIFICATIONS Right Display Wavelength Units nm cm Range 500 0 to 1000 0 nm 20 000 to 10 000 cm Resolution nm 1 cm Right Display Wavelength Bargraph Percent of full scale power Brightness 5 settings General Specifications Operating Temperature 15 C to 35 C Storage Temperature 40 C to 70 C Humidity non condensing gt 100 uW lt 85 RH 100 pW lt 70 RH Overall Dimensions 68 6 mm diameter x 30 1 mm Weight lt 0 5 kg Input Port Diameter 6mm Input Type Integrating sphere Optical Stand Accommodations 8 32 tapped hole centered Fiber Optic Adapter FC SC ST2. eee E E veve n n eee n enan noon 16 Chapter4 Calibration Calibration Overview 19 Recommended Equipment 19 et te hee m Bet Do Le Pede ee aim t 19 Manual Operation User Calibration 20 Remote GPIB Operation User Calibration 20 Programming a Fixed Offset to Wavelength and Power Measurements 21 Resetting the User Calibration 21 ii OMH 6722B Lightwave TABLE OF CONTENTS Chapter 5 Troubleshooting INUOGUCHON e antes 23 Troubleshooting Guide 23 OMH 6722B iii TABLE OF CONTENTS iv OMH 6722B Lightwave LIST OF FIGURES LIST OF FIGURES Figure 2 1 OMM 6810B Front Panel 6 Figure 2 2 Rear Panel Input 7 Figure 2 3 Power Analog Out 8 Figure 2 4 OMH 6722B Optical Measurement Head 9 Figure 2 5 Wavelength Setting 10 Figure 3 1 Command Path Structure 18 OMH 6722B v LIST OF FIGURES vi OMH 6722B Lightwave LIST OF TABLES LIST OF TABLES Table 3 1 Device Dependent Commands valid with the OMH 6722B 17 Table 3 2 Device Dependent Commands which are not usable with the OMH 6722B 18 OMH 6722
3. Connector to Main Unit 26 pin high density sub D E Add 0 5 from 400 to 450 nm and from 990 to 1100 nm 2 Minimum optical power required for accurate wavelength measurement 400 nm 500 nm 100 uW 10 dBm 500 nm 1100 nm 10 uW 20 dBm For power measurement below these levels use MANUAL wavelength mode 3 For input power 100 mW Add 0 05 100 mW to power accuracy Add 0 05 nm 100 mW to wavelength accuracy Example 500 mW 850 nm accuracy 4 2 1 2 nm 4 MANUAL wavelength mode Add 0 5 for automatic wavelength correction Our goal is to design and produce the best optical test equipment available anywhere To achieve this we need your ideas and comments on ways we can improve out products We invite you to contact us at any time with your suggestions OMH 6722B Lightwave CHAPTER 2 OPERATION This chapter describes how to install and operate the OMH 6722B Silicon Power WaveHead in conjunction with a OMM 6810B Optical Multimeter It is divided into sections covering installation power up front panel and rear panel controls and general operation A detailed familiarization of the main unit features are presented in Chapter 2 of the OMM 6810B Instruction Manual Installation The OMH 6722B must be connected to the 6810B Make sure the power to the main unit is turned off and connect the cable from the 6722B to the INPUT connector on the rear panel of the 6810B WAR
4. This condition occurs when the instrument interprets the laser s wavelength as less than 400 nm which is beyond the capability of the OMH 6722B Measurements are not accurate at a known wavelength or power standard Be certain the zeroing procedure has been performed correctly It may be necessary to perform the User Calibration The source may be too close to the WaveHead and is emitting non lasing radiation into the aperture Measurement seems erratic with a pulsed source input Change update rates Best results with pulsed sources are usually in the SLOW update rate Work in MANUAL gain ranging mode the AUTORANGING algorithm may have difficulty with some pulsed sources especially those with duty cycles less than 5095 Lightwave
5. especially by blowing into it or by using compressed air If minor dust or other particulates have entered the input aperture remove the contaminant using canned air or dry nitrogen Use short bursts while holding the head such that the aperture is directed downward OMH 6722B CHAPTER 2 13 OPERATION CHAPTER 2 Care and Maintenance 14 OMH 6722B I LX Lightwave CHAPTER 3 COMMAND REFERENCE Introduction This chapter is a guide to the usage of the device dependent GPIB commands for the OMM 6810B Optical Multimeter when the OMH 6722B Silicon Power Head is attached This chapter is of primary interest to users who wish to utilize the GPIB option A complete reference describing the syntax and usage of each device dependent command is provided in Chapter 4 of the OMM 6810B Instruction Manual Refer to the LWM 6500B Instruction Manual if the OMH 6722B is being used in conjunction withe the Laser Wavelength Meter Common Commands The GPIB Common Commands which are defined by the ANSI IEEE 488 2 1987 standard are described in Chapter 3 of the OMM 6810B Instruction Manual These commands do not necessarily reflect front panel operations and are not unique to the measurement head connected to the meter In other words the common commands listed in the 6810B Instruction Manual are all valid when using the OMH 6722B Device Dependent Commands Chapter 4 of the OMM 6810B Instruction Manual contains the complete set of device depende
6. 03 OMH 6722B xiii WARRANTY 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 xiv OMH 6722B I LX Lightwave CHAPTER 1 INTRODUCTION AND SPECIFICATIONS This manual contains operation and maintenance information for the OMH 6722B Silicon Power Wave Head The OMH 6722B may be used in conjunction with either the OMM 6810B Optical Multimeter or the LWM 6500B Laser Wavelength Meter To get started immediately first read Appendix B of the OMM 6810B Instruction Manual Product Overview The OMH 6722B Silicon Power WaveHead when coupled to an OMM 6810B Optical Multimeter provides the capability to accurately measure the power and wavelength of laser sources between 400 and 1100 nm The OMH 6722B is calibrated to NIST traceable power and wavelength standards to ensure accuracy The OMH 6722B can also be used with the LWM 6500B to measure wavelength only Easy mounting quick setup and alignment and a two meter cable make the ILX Lightwave Optical Measurement Head easy to integrate into an experiment The instrument can be integrated with other equipment via the optional GPIB IEEE 488 2 interface The 6722B can also be used for fiber optic measurement applications via an optional fiber optic adapter Safety Considerations The high brightness sometimes invisible light output of laser diodes and other laser sources poses a definite
7. death injury or damage to the instrument and other On In position of a bistable push control Off Out position of a bistable push control components Caution Earth Alternating Visible and or refer to ground current invisible laser manual Terminal AN radiation Caution risk Protective Caution hot Frame or of electric Conductor surface chassis shock Terminal Terminal or 1 The slash only denotes that mains are on or 0 The circle O only denotes that mains are off OMH 6722B Lightwave WARRANTY WARRANTY ILX LIGHTWAVE CORPORATION warrants this instrument to be free from defects in material and workmanship for a period of one year from date of shipment During the warranty period ILX will repair or replace the unit at our option without charge Limitations This warranty does not apply to fuses lamps defects caused by abuse modifications or to use of the product for which it was not intended This warranty is in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for any particular purpose ILX Lightwave Corporation shall not be liable for any incidental special or consequential damages If a problem occurs please contact ILX Lightwave Corporation with the instrument s serial number and thoroughly describe the nature of the problem Returning an Instrument If an instrument is to be
8. eye hazard Direct viewing of the laser output can produce retinal or corneal damage Absorption of the laser light by the eye causes localized heating and denaturing of tissue proteins The ANSI publication Z 136 1 The Safe Use of Lasers lists Maximum Permissible Exposure MPE levels for direct or intrabeam viewing of laser beams From the MPE levels a hazard zone may be computed for a particular laser and exposure time Il LX Lightwave OMH 6722B 1 INTRODUCTION AND SPECIFICATIONS CHAPTER 1 Product Overview For more information concerning lasers and laser diode safety contact the Center for Devices and Radiological Health or ILX Lightwave warnino Refer Servicing only to qualified authorized personnel Available Options and Accessories The OMH 6722B must be coupled to the OMM 6810B Optical Multimeter Other options and accessories available with the OMM 6810B are listed in the OMM 6810B manual OMH 6722B I LX Lightwave INTRODUCTION AND SPECIFICATIONS Specifications Specifications 1 Input Specifications Power Measurement Range 100 nW 1 W 40 dBm 30 dBm Accuracy 3 5 450 to 990 nm 1 34 Wavelength Measurement Range 400 to 1100 nm Accuracy 1 0 nm3 Temperature coefficient lt 0 03 nm C Linearity with power change 0 5 nm Maximum change in measured wavelength due to power change Sampling Rate
9. from the front panel keypad indicator LEDs and dual displays A drawing of the front panel is shown in Figure 2 1 Front panel functions which are not available with the OMH 6722B are outlined later in this Chapter Refer to the OMM 6810B Instruction Manual for descriptions of each front panel switch function L i WEP Light DISPLAY a im m T3 LOG LIN nm em Hop so so m L J L m KY i l e E AA GPIB Af POWER nf WAVELENGTH 1CAL VIEW REF BRIGHT m AUTO ATTN AUTO ga gt USER RATE ZOOM POWER REMOTE l STOREA A1 A2 n l LOCAL J RANGE A3 raum 7 Figure 2 1 OMM 6810B Front Panel OMH 6722B Lightwave OPERATION Front Panel Controls 2 Unused Functions The Multimeter function that is not utilized disabled when the OMH 6722B is attached are shown to the right If a disabled button is pushed the 6810B will display the error code E 715 ATTN All other switch functions perform as described in the OMM 6810B Instruction Manual Error Display Execution errors are indicated on the right display Errors are shown as E xxx where xxx is a three digit number representing the unique error Errors are displayed for three
10. shipped to ILX Lightwave for repair or service be sure to 1 Obtain a Return Authorization number RA from ILX Customer Service 2 Attach a tag to the instrument identifying the owner and indicating the required service or repair Include the instrument serial number from the rear panel of the instrument 3 Attach the anti static protective caps that were shipped with the instrument and place the instrument in a protective anti static bag 4 Place the instrument in the original packing container with at least inches 7 5 cm of compressible packaging material Shipping damage is not covered by this warranty 5 Secure the packing box with fiber reinforced strapping tape or metal bands 6 Send the instrument transportation pre paid to ILX Lightwave Clearly write the return authorization number on the outside of the box and on the shipping paperwork ILX Lightwave recommends you insure the shipment If the original shipping container is not available place your instrument in a container with at least 3 inches 7 5 cm of compressible packaging material on all sides Repairs are made and the instrument returned transportation pre paid Repairs are warranted for the remainder of the original warranty or for 90 days whichever is greater OMH 6722B xi WARRANTY 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 cl
11. the OMM 6810B Instruction Manual Remote operation is discussed in Chapter 4 Warm up and Environmental Considerations The main unit and Optical Measurement Head should operate at an ambient temperature between 10 and 35 C and a relative humidity less than 70 Storage temperatures should be between 40 and 70 C To achieve rated stability let both devices warm up for at least one hour Beam Alignment Considerations The OMH 6722B is designed to provide a simple operating format The beam from the source should be directed perpendicular to the face of the 6722B and directly into its aperture Be sure the entrance angle does not exceed the specified 10 from perpendicular Be aware that certain lasers emit a significant amount of non lasing radiation This radiation can cause erroneous measurements if the source is placed too close to the measurement head The innovative ILX Optical Measurement Head offers easy access for many different source types Fiber Optic Adapter Mounting Holes Aperture Centered Figure 2 4 OMH 6722B Optical Measurement Head 4 03 OMH 6722B 9 OPERATION CHAPTER 2 General Operating Procedures Diverging Beams Laser Diodes The OMH 6722B can measure the wavelength and power of laser diodes without the need for complicated coupling optics For low powered lasers and laser diodes position the package as close as possible to the 6722B to insure that all of the light enters the integrating sph
12. the Optical Measurement Head Pressing the CAL USER button when the CAL USER LED is lighted causes the instrument to revert to factory calibration and the LED to go out Pressing the CAL SET button while the LED above the CAL USER button is lighted initiates the user calibration procedure SET 12 OMH 6722B I LX Lightwave OPERATION Installing Fiber Optic Adapters Installing Fiber Optic Adapters Use the following procedure to install Fiber Optic Adapters onto the OMH 6722B Measurement Head Locate the model AO270 threaded ring adapter and the two 42 56 X 3 16 cap screws that secure it to the Measurement Head Place the adapter onto the face of the Measurement Head and secure it using the two cap Screws The adapter is now ready to receive any AOXXX series screw on fiber optic adapter cap e g AO271 FC Screw the cap on until it bottoms out on the face of the Measurement Head Care and Maintenance The design of the Measurement Head is fairly robust however it should be handled with care Stress from dropping the Head or other mishandling could dislodge critical alignments within the Head effectively changing its response and nullifying its calibration It is also sensitive to electrostatic discharge When not in use replace the ESD protective cap that came with the Head on the D connector and store the Head in the ESD safe bag Cleaning In general avoid cleaning the interior of the Measurement Head
13. B vii LIST OF TABLES viii OMH 6722B Lightwave SAFETY AND WARRANTY INFORMATION The Safety and Warranty Information section provides details about cautionary symbols used in the manual safety markings used on the instrument and information about the Warranty including Customer Service contact information Safety Information and the Manual Throughout this manual you will see the words Caution and Warning indicating potentially dangerous or hazardous 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 AN warnine Warning indicates a potentially dangerous situation which can result in serious injury or death Fi 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 see the con
14. E OFFSET OFFSET OPC RANGE OFESET OFFSET OPC RATE REF REF RATE PRE REF REF PRE SECURE PSC TERM PSc TERM PUD TIME PUD TIMER RST TRIGGER SRE TRIGGER SRE WAVE STB WAVE ST ZERO WAI ZERO 18 OMH 6722B Figure 3 1 Command Path Structure Lightwave CHAPTER CALIBRATION This chapter describes how to calibrate the OMH 6722B Silicon Power WaveHead The OMH 6722B Silicon Power WaveHead has been sealed to protect internal components from damage and to maintain the factory calibration Do not attempt to disassemble the Optical Measurement Head Calibration Overview It is possible to calibrate the OMH 6722B using a source of known wavelength and power Calibrate the 6722B whenever performance verification indicates that calibration is necessary The wavelength calibration consists of one point which shifts future measurements by the amount of the calibration The power calibration consists of one point which changes future power measurements by the percentage calculated during the calibration Recommended Equipment It is recommended that gas line sources not laser diodes be used for calibration Ideal sources include gas lasers such as HeNe at 632 8 nm and spectral lamps with the proper line isolation filters such as a Cesium Lamp and a 845 nm 855 nm interference filter to isolate the 852 1 nm Cesium emission line Laser diodes should not be used since current and temperat
15. NING Do not attach or remove the Optical Measurement Head while power is applied to the OMM 6810B Please turn the power switch off when changing heads WARNING To avoid electrical shock hazard connect the meter to a properly earth grounded three prong receptacle only Failure to observe this precaution can result in severe injury or death Il LX Lightwave OMH 6722B 5 OPERATION cHAPTER 2 Power Up Power Up Connect the main unit to an AC power source Press the POWER switch to supply power to the device and start the power up sequence The power up sequence takes about six seconds Initially all LEDs and enunciators are illuminated and the seven segment displays denote 8 Then all LEDs and the displays are turned off while the microprocessor executes a device self test Should the self test fail error message E 720 is displayed The Meter then loads personality and calibration data from the measurement head The left display indicates 6722 and the firmware version is shown on the right display If an error occurs while loading data message E 711 is displayed If an incompatible head is connected error message E 713 is shown If the measurement head is not connected the display shows until a measurement head is attached At power up the main unit is configured to the same state that was present when the power was last turned off Front Panel Controls The OMM 6810B OMH 6722B is intuitively operated
16. WN arrow buttons The selected digit will flash Use the WAVELENGTH UP and DOWN arrow buttons to increment or decrement the selected digit If no buttons are pressed in three seconds the displayed wavelength will be locked in and the digit will stop flashing Commonly used wavelengths may be stored or retrieved by using the WAVELENGTH BLUE SHIFT STORE A A1 A2 A3 and A4 buttons as described in Chapter 2 of the OMM 6810B manual Zeroing The ZERO function is used to remove the effects that erroneous room light has on the wavelength and power measurement It is important to zero the OMM 6810B with the OMH 6722B attached before taking measurements This is ZERO especially true for low input power applications or in cases of high ambient light intensity When measuring lower power levels avoid letting background radiation into the measurement head Pressing the DISPLAY ZERO button when the DISPLAY ZERO indicator is not lighted starts the zeroing process While zeroing the 0 digit wa ks across both displays and the DISPLAY ZERO indicator flashes When zeroing is complete the DISPLAY ZERO indicator is illuminated Pressing the DISPLAY ZERO button when the DISPLAY ZERO indicator is illuminated disables the effects of the zero The procedure for zeroing the instrument is described below The beam from the optical source should be blocked at the source or turned off Note If a beam stop is used it should be positioned as close to
17. aim 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 xii OMH 6722B I LX Lightwave WARRANTY Comments Suggestions and Problems To ensure that you get the most out of your ILX Lightwave product we ask that you direct any product operation or service related questions or comments to ILX Lightwave Customer Support You may contact us in whatever way is most convenient Phone silk d an poke a pann RR 800 459 9459 or 406 586 1244 A GLA ie 406 586 9405 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 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 4
18. br User s Guide Silicon Power Wavehead OMH 6722B 53cB o oves Laser Diode Instrumentation amp Test Systems ILX Lightwave Corporation Box 6310 Bozeman MT U S A 59771 U S 8 Canada 1 800 459 9459 International Inquiries 406 556 2481 Fax 406 586 9405 ilx custhelp com www ilxlightwave com 70023303 RO0 03 03 Chapter 1 Chapter 2 TABLE OF CONTENTS TABLE OF CONTENTS Safety and Warranty Information vii Safety Information and the vii General Safety Considerations vii Safety Symbols Soon eo Qu ae BO b AA M d det es viii Safety Marking Symbols viii bag ri OPTED ix Comments Suggestions and Problems xi Introduction and Specifications Product Overview 1 Safety 5 5 1 Available Options and Accessories 2 Specifications ko oi usce ve ao al oc nore Roan a aa C ewes 3 Operation Installati n ERE ER M 5 PowerUp ieu ate eqs o Ve ations art 6 Front Panel COMMIS tweet voee or eti Re cob 6 Unused Functions cute gue eR RR eR ERE D eek wago
19. e laser s known power using the POWER UP and DOWN arrow buttons If large adjustments are necessary hold down the UP or DOWN button to accelerate the change Press the CAL SET button to complete the calibration The unit returns to real time wavelength and power measurements Remote GPIB Operation User Calibration Remote controlled User Calibration is described in the following procedure lt may help to be familiar with the manual calibration in Section 6 3 before attempting it remotely Identify ambient conditions Block the laser beam from entering the aperture of the OMH 6722B Startthe calibration by clearing the status registers then zeroing the instrument by issuing the following GPIB commands CLS RANGE AUTO ON ZERO Wait for the zero to finish The controlling software can monitor the status of zeroing by sending the following query in a loop Exit the loop when the response is 1 ZERO Launch a laser of known wavelength and power into the aperture of the 6722B Start the 20 OMH 6722B calibration by sending the following commands CAL USER ON CAL USER START Lightwave CALIBRATION Programming a Fixed Offset to Wavelength and Power Measurements Enter the known wavelength using the command CAL WAVESET SS where xxxx xx is the known wavelength and ss is the units um nm or cm Enter the known power using the command CAL POWERSET xxxx xx ss where i
20. ere Collimated Beams The OMH 6722B is capable of measuring the wavelength and power of narrow beam lasers As with other lasers collimated beams should enter the aperture perpendicular to the face of the 6722B To maintain accuracy do not allow the beam to strike the edge of the entrance aperture Focused Beams The OMH 6722B also accepts converging beams In high power applications be sure that the focus of the beam does not occur at the rear of the integrating sphere Again perpendicular beam entry to the Head is required Fiber Optic Cable A fiber optic adapter options AO271 AO272 273 and AO276 can be mounted onto the face of the OMH 6722B Measurement Head This threaded ring adapter cap option accepts a variety of fiber optic connector styles for direct coupling of a fiber optic cable to the head Measuring or Setting the Wavelength For automatic wavelength compensation of power measurements press the WAVELENGTH AUTO button so that the indicator above the button is lighted The wavelength of the source can also be manually programmed into the OMM 6810B using the procedure below WAVELENGTH we 5 Figure 2 5 Wavelength Setting 10 OMH 6722B Lightwave OPERATION General Operating Procedures 2 Use the WAVELENGTH LEFT and RIGHT arrow buttons to select the digit on the Wavelength display that will be controlled by the WAVELENGTH UP and DO
21. n 7 Error Display eee eU mE eS ORE e Ei 7 Rear Panel Connections 7 OMH 6722B TABLE OF CONTENTS Input COANSCON oor uc e een ate ET e daw ec xatd 7 decd VS Gedo Rec m IN ted gae EEA 8 General Operating Procedures 9 Warm up and Environmental Considerations 9 Beam Alignment Considerations 9 Diverging Beams Laser 10 Gollimated Beams e ee sa Ue S an ab eM 10 Beams Eten Ua os mae Bok ee ace ak er 10 Fiber Optic Cable eee ter enn ken ear a aaa en nee nan 10 Measuring or Setting the Wavelength 10 ace teo eus ege 11 User Calibration 2 erede ROI ee tal 12 Installing Fiber Optic Adapters 13 Care and Maintenance 13 Cleaning lek a fa drea Rigen da oka Seeders oe 13 Chapter 3 Command Reference INTRODUCTION teh ned a c 15 CommandS n 15 Device Dependent 15 Error Messages 16 Programming Examples
22. nt GPIB commands Table 4 1 on the next page outlines the subset of commands which are valid when the OMH 6722B is attached The command path tree structure is illustrated in Figure 4 1 Note The usage and syntax of each device dependent command is best described in Chapter 4 of the OMM 6810B Optical Multimeter Instruction Manual Lightwave OMH 6722B 15 16 CHAPTER 3 Error Messages OMH 6722B Error Messages COMMAND REFERENCE Error messages may appear on the right display In remote operation the current error list can be read by issuing the ERR query When this is done a string is returned containing the previously unread error messages up to ten When the error queue is active bit 7 of the Status Byte is also set to one Appendix A of the OMM 6810B Instruction Manual contains an explanation of the error messages which may be reported by the 6810B on the display or via remote operation Programming Examples Two examples of programming the 6810B via GPIB are shown in the 6810B Instruction Manual Chapter 4 Command Name Parameters Description Expected BRIght 1 Sets the brightness of the front panel BRight None Returns the level of the display brightness CAL POWERSET 2 Sets the user calibration power CAL RECall None Resets the user calibration CAL USER None Starts the user calibration COND None Returns the condition status regis
23. resentative at 406 586 1244 Lightwave OMH 6722B 23 24 CHAPTER 5 OMH 6722B TROUBLESHOOTING Troubleshooting Guide Symptom Causes and Corrective Actions Measurement will not stabilize The OMH 6722B is designed to accurately measure the wavelength of a CW source with an amplitude instability of up to 4096 depth of modulation Ensure the laser source s wavelength is stable and that any modulation is minimized This condition may occur if the laser has not warmed up Most gas laser cavities expand when first turned on which can cause intensity and wavelength fluctuations Check for tight connections between the main unit and the 6722B and ensure other noisy electronic devices are not located near the Optical Measurement Head In cases of low input power and or high background light try working in a dark environment and be sure to zero the instrument as described in Chapter 2 Display shows The 6722B is not connected to the main unit Display shows HI P This condition occurs when the laser s input power exceeds the maximum allowed for the selected gain range Measurements at this level are invalid If in manual mode press the DOWN switch to select the next lower gain range Display shows HI A This condition occurs when the instrument interprets the laser s wavelength as greater than 1100 nm which is beyond the capability of the OMH 6722B Display shows LO A
24. s the known power and ss is the units pw nw pw mw w or dbm The calibration is complete and the 6810B is performing real time wavelength and power measurements Programming a Fixed Offset to Wavelength and Power Measurements Rather than performing a User Calibration it is possible to enter offset values which are applied to future wavelength and power measurements For more information refer the POWER OFFSET and WAVE OFFSET GPIB commands in Chapter 4 of the OMM 6810B Instruction Manual Resetting the User Calibration The User Calibration is preset at the factory The factory preset calibration can be restored by pressing the CAL USER button on the 6810B so that the CAL USER indicator is off or by sending the GPIB command CAL USER OFF OMH 6722B CHAPTER 4 21 CALIBRATION cHAPTER 4 Resetting the User Calibration 22 OMH 6722B I LX Lightwave CHAPTER 5 TROUBLESHOOTING Introduction This chapter is intended to be used as a guide when the OMM 6810B and OMH 6722B do not perform as expected It is not a service manual rather a guide to alleviate basic problems which may arise during operation A more complete guide including a GPIB troubleshooting guide is provided in Chapter 7 of the OMM 6810B Instruction Manual Troubleshooting Guide If you have difficulty using the 6722B refer to the symptoms listed here Common causes and corrective actions are listed here If problems persist contact your ILX Lightwave rep
25. seconds or until the error causing condition is remedied whichever is longer See Appendix A in the OMM 6810B Instruction Manual for a detailed list of error messages Rear Panel Connections The OMH 6722B interfaces with the rear panel of the multimeter as described in the following paragraphs Input Connector The OMH 6722B interfaces the Multimeter via the 26 pin high density D connector located on the lower left side of the rear panel Do not attach or remove the head while power is applied to the Optical Multimeter Please turn the power switch off when changing optical measurement heads Figure 2 2 Rear Panel Input OMH 6722B 7 OPERATION CHAPTER 2 Front Panel Controls Analog Output Analog output representing the power measurement is located in the upper left corner of the 6810B rear panel The POWER ANALOG OUT is a non calibrated value between 0 and 10 volts representing the measured power as a percent of full scale power within the selected gain range For example if the full scale power for gain range three is 10 LW and the displayed power is 5 000 uW then 5 0 volts is present on the POWER ANALOG OUT connector POWER ANALOG OUT Figure 2 3 Power Analog Out OMH 6722B Lightwave OPERATION General Operating Procedures 2 General Operating Procedures The following sections present some guidelines for operating the OMM 6810B with the OMH 6722B More detailed instructions are found in
26. surement rate string SECURE 1 Used by service personnel to access PUB TERM 1 Sets the program message terminator TERM 1 Returns the program message terminator TIME None Returns elapsed time since power up TIMER None Returns elapsed time since last TIMER WAVE 2 Sets the wavelength WAVE None Returns the set wavelength WAVE AUTO 1 Sets the auto wavelength feature on or off WAVE AUTO None Returns the status of auto wavelength WAVE MODE 1 Sets the wavelength display units WAVE MODE None Returns the wavelength display units WAVE OFFSET 2 Sets the wavelength offset WAVE OFFSET None Returns the wavelength offset WAVE REFerence 2 Sets the reference for AA WAVE REFerence None Returns the wavelength reference point ZERO None Starts the zeroing function ZERO None Returns the status of the zeroing Table 3 1 Device Dependent Commands valid with the OMH 6722B OMH 6722B 17 CMS a 3 Error Messages COMMAND REFERENCE Command Name Parameters Description Expected ATTen 1 Enables disables the attenuation function AT Ten None Returns the status of the attenuator Table 3 2 Device Dependent Commands which are not usable with the OMH 6722B BRIGHT T NI rd BRIGHT DLF COND ESE ERR M AA root AW i ud PRESELECT RANGE WAVE ole CHAN AUTO AUTO ESE RECALL COND AUTO CHAN AUTO AUTO ESR HOLD USER EVE MODE SAVE MODE IDN POWER WAVESET EVE MODE MODE IST RANG
27. tact information on page xiii All instruments returned to ILX Lightwave are required to have a Return Authorization Number assigned by an official representative of ILX Lightwave Corporation See Returning an Instrument on page xi for more information Il LX Lightwave OMH 6722B ix SAFETY SYMBOLS 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 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
28. ter ENAB COND 1 Sets the enable register for conditions ENAB COND None Returns the condition enable register ENAB EVENT 1 Sets the enable register for events ENAB EVENT None Returns the event enable register ERRors None Returns errors generated since last ERR EVEnt None Returns the event status register HEAD IDN None Returns the head identification string HOLD None Returns the hold status POWer None Returns the power measurement POWer AUTO 1 Sets the power autoranging mode on or off POWer AUTO None Returns the status of power autoranging POWer MODE 2 Sets the power display units POWer MODE None Returns the power display units POWer OFFSET 1 Sets the power offset multiplier POWer OFFSET None Returns the power offset multiplier Lightwave COMMAND REFERENCE Error Messages CHAPTER 3 POWer REFerence 2 Sets the reference for AP measurements POWer REFerence None Returns the power reference level PREselect CHAN 1 Selects on of four preselected wavelengths PREselect CHAN None Returns the preselected wavelength channel being used PREselect SAVE 2 Sets one of the four preselected wavelengths RANge 1 Sets the gain range manual RANge None Returns the gain range auto manual RANge AUTO 1 Sets the autoranging mode on or off RANge AUTO None Returns the status of the autoranging RATE 1 Sets the measurement rate RATE None Returns the mea
29. the source as possible to allow the maximum collection of background noise If the entry aperture to the OMH 6722B is blocked instead the zeroing function will not work properly This is especially true for low power applications or in areas of high background light fthe DISPLAY ZERO indicator is illuminated press the DISPLAY ZERO button once to disable the existing compensation factors e Press the DISPLAY ZERO button While zeroing the O digit walks across the display and the DISPLAY ZERO indicator flashes When zeroing is complete the DISPLAY ZERO indicator is lighted The process takes about 15 seconds Allow the beam to enter the aperture of the head Accurate measurements are displayed Note If the ambient environmental conditions change e g the room lights are turned on or off the instrument must be re zeroed to maintain its accuracy Pressing the DISPLAY ZERO button again disables the compensating factors and the DISPLAY ZERO indicator is turned off OMH 6722B 11 OPERATION CHAPTER 2 General Operating Procedures User Calibration It is possible to calibrate the OMH 6722B using a laser source of SCARS known power and wavelength The calibration procedure is described in Chapter 6 of this manual Press the CAL USER button to toggle the instrument in and out of the User Calibration Mode When the LED above the CAL USER button is lighted the unit employs the user defined calibration which has been stored in
30. ure can affect the output wavelength An extremely stable laser diode may be used if it is lasing in a single mode and the wavelength is first measured with a calibrated optical spectrum analyzer Warm up Before attempting calibration the OMH 6722B should be allowed to warm up for at least 1 hour after being connected to the main unit Lightwave OMH 6722B 19 CHAPTER 4 CALIBRATION Manual Operation User Calibration Manual Operation User Calibration Front Panel execution of the User Calibration using the OMM 6810B is described in the procedure below Identify ambient conditions and zero the instrument as described in Section 2 6 4 Launch a laser of known wavelength and power into the OMH 6722B Start the calibration by pressing the CAL USER button to place the unit in User Calibration Mode The LED above the CAL USER button will light Press the CAL SET button to initiate the User Calibration Procedure The left display will show CAL A The measured wavelength is shown on the right display Adjust the displayed wavelength to match the laser s known wavelength using the WAVELENGTH LEFT and RIGHT buttons to select a digit and then use the WAVELENGTH UP and DOWN arrow buttons to change the wavelength Press the CAL SET button to complete the wavelength calibration The right display will now indicate CAL P The measured power will be shown on the left display Adjust the displayed power to match th
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