H0407-1030 Model 407K_44640-01RevA 5-5x7-5.qxd
Contents
1. Rotate battery out of mount Vad Pull tab back with finger Figure 6 1 l Make sure that the rotary switch is in the OFF position most counterclockwise Unplug the battery from its mounting bracket terminals The circuit board has a hole drilled in it between the battery terminals A suitable stiff insulated rod may be inserted through the mounting bracket and anchored in the hole Then the rod can be pulled back as a lever to separate the battery from the bracket s terminals A 3 32 flat blade screw driver with 3 long blade insulated with a piece of shrink tubing works well as a rod 30 Remove the battery from the mounting bracket s clip as shown in Figure 6 1 Use a thumb or forefinger of one hand to pull back one side of the clip and use the fingers of the other hand to rotate the battery and pull it out of the clip The clip is rather stiff so be careful no to hurt your fingers or fingernails Be careful not to break the wire connections from the circuit board to the panel meter Avoid touching the circuitry on the board so as to not contaminate it with finger oils Cover the terminals of the old battery with nonconductive tape such as the vinyl tape used by electricians and dispose of the battery following local ordinances Use a similar procedure as in Step 2 to install the new battery in the mounting brackets clip Use caution since the battery may be charged Reconnect the battery to the bracke2. Check laser power again with the reference standard meter 24 6 Service and Repair Introduction Your Model 407A requires no routine maintenance Newport does not recommend user repair of this product If your unit needs repair we recommend that you return it to the nearest Newport Service Center However we recognize that there may be times when return of the unit to a repair facility might pose a hardship or inconvenience For this reason we provide the following technical description for chang ing the meter lamps and the rechargeable battery these components are expected to have at least 5 to 10 year service life No other com ponents should ever require replacement in normal operation Note that if the detector disk becomes damaged the power meter read out and head should be returned together to your local Newport Service Center Replacement Items The 5 foot 1 5 m connecting cable between detector head and the display unit has male BNC terminations and uses RG 174 U cable Newport part number 6015 0290 Two types of battery chargers are sold with the Model 407A Voltage Spectra Physics 90 132 Vac 50 60 Hz 90036748 25 Cleaning Your Unit Should your power meter display unit need cleaning please observe the following precautions Clean the meter face with a mild detergent and a moist not wet SOFT CLOTH to avoid scratching the plastic face do not use solvents e Do not allow solvents
3. Model 407A CW Laser Power Meter eee 10 1 1 2 3 s 30 3 A OFF y ATT LOW 03 amp Spectra Physics 8 User s Manual ND Newport Experience Solutions Model 407A CW Laser Power Meter EU Declaration of Conformity We declare that the accompanying product identified with the CE mark com plies with requirements of the Electromagnetic Compatibility Directive 2004 108 EC and the Low Voltage Directive 2006 95 EC Model Number 407A Year CE mark affixed 1995 Type of Equipment Electrical equipment for measurement control and laboratory use in industrial locations Manufacturer Newport Corporation 1791 Deere Avenue Irvine CA 92606 Standards Applied Compliance was demonstrated to the following standards to the extent applicable EN 50081 2 1993 Emissions EN 55011 Class A Radiated EN 55011 Class A Conducted EN 50082 1 1992 Immunity IEC801 2 Electrostatic Discharge IEC 801 3 RF Radiated IEC 801 4 Fast Transient BP Vi leng DA ek Dominique Devidal Manny Del Valle Quality Director Senior Manager Product Development Zone Industrielle 1791 Deere Avenue 45340 Beaune la Rolande France Irvine CA USA ii Warranty Newport Corporation warrants that this product will be free from defects in material and workmanship and will comply with Newport s published specifications at the time of sale for a period of one year from date of shipment If found to be defective
4. absorptance must be taken into account when making exacting power measurements at wavelengths other than that at which calibration is preformed 22 Procedure l Set up the laser to operate at the desired wavelength and power Verify power with a calibrated reference standard power meter 2 Set up your Model 407A so that the meter 1s easily readable and you have easy access to the CALIB and SPEED controls in the back of the display unit A mirror can be used to view the meter while adjusting the controls The meter has a mirrored scale to prevent parallax error during reading 3 Check the mechanical zero of the 407A s meter while the unit is OFF 4 Rotate the 407A s rotary switch to the 1 W setting 1 W calibration is assumed in this procedure 5 Align the 407A s meter pointer with 0 on the upper scale by adjust ing the ZERO control 6 To adjust the meter place the detector head in the path of the laser beam and allow the meter reading to stabilize Adjust the CALIB control to give full upper scale deflection of the meter pointer 1 e pointer aligned with 10 The CALIB control is accessible through the rear panel of the display unit with a 1 8 3mm wide blade screw driver Clockwise rotation of the control when viewed from rear cover increases the meter reading K Block the laser beam and let the meter pointer return to 0 Due to cooling of the head you may have to wait a minute to allow t
5. equipment e Heed all warnings on the unit and in the operating instructions e Do not use this equipment in or near water e Route power cords and other cables so that they are not likely to be damaged e Disconnect power before cleaning the equipment Do not use liquid or aerosol cleaners use only a damp lint free cloth e To avoid explosion do not operate this equipment in an explo sive atmosphere e Qualified service personnel should perform safety checks after any service General Cautions e Observe these cautions when operating this equipment e If this equipment is used in a manner not specified in this man ual the protection provided by this equipment may be impaired e Do not position this product in such a manner that would make it difficult to disconnect the power cord e Use only the specified replacement parts e Follow precautions for static sensitive devices when handling this equipment e This product should only be powered as described in the manual e Adhere to good laser safety practices when using this equipment Summary of Warnings and Cautions The following general warning and cautions are applicable to this instrument WARNING Before operating the Model 407A CS Laser Power Meter please read and understand all of Section 2 6 WARNING Do not attempt to operate this equipment if there is evidence of AN shipping damage or you suspect the unit is damaged Damaged e
6. all applicable European Union CE regulations and rec ommendations Alternating voltage symbol fa Figure 4 Alternating Voltage Symbol This international symbol implies an alternating voltage or current Waste Electrical and Electronic Equipment WEEE Figure WEEE Directive Symbol This symbol on the product or on its packaging indicates that this product must not be disposed with regular waste Instead it is the user responsibility to dispose of waste equipment according to the local laws The separate collection and recycling of the waste equipment at 4 the time of disposal will help to conserve natural resources and ensure that it is recycled in a manner that protects human health and the envi ronment For information about where the user can drop off the waste equipment for recycling please contact your local Newport Corporation representative Warnings and Cautions The following are definitions of the Warnings Cautions and Notes that are used throughout this manual to call your attention to impor tant information regarding your safety the safety and preservation of your equipment or an important tip AN WARNING Situation has the potential to cause bodily harm or death CAUTION Situation has the potential to cause damage to property or equipment NOTE Additional information the user or operator should consider General Warnings e Observe these general warnings when operating or servicing this
7. determined and displayed in about one second Two drawbacks occur to this speeding up of the output signal Abrupt changes in the signal applied to the compensating network which occurs when adjusting the ZERO control and when changing scales cause the meter response to exhibit overshoot Also noise in the cir cuit is accentuated over that seen without the compensating network 18 Operating Instructions The Model 407A was designed for ease of operation During normal operation only initial zeroing of the meter and power range selection is required Turning on the Model 407A The Model 407A will arrive with the battery in a partially or com pletely charged condition The charging circuit is designed not to damage the battery even during extended charging periods Therefore we recommend that the user normally leave the power supply plugged into the Model 407A and into an ac power source Input signals not derived from the head may cause rapid but momen tary needle motion due to the influence of the anticipation circuit Examples include scale changes and zeroing the meter This behavior 1s normal Zeroing Procedure 1 While the meter selection knob is in the OFF position verify that the meter needle points to zero If adjustment required rotate the screw on the front panel of the readout to zero the needle 2 Plug in the detector head to the readout jack marked HEAD using the BNC cable provided The head should ideally b
8. into a wall outlet and connect the charger plug to the receptacle on the side of the 407A display unit The 407A may continue to be used while the battery is charging If the LED has been blinking some time before battery is recharged the LED may continue to blink for several minutes after the charger is plugged in while battery voltage increases A full charge normally requires 14 hours with the 407A s range selec tor switch in the OFF position and 16 hours otherwise Although a blinking BATT LOW light indicates the need for a recharge you can safety operate your 407A an additional 20 minutes before connecting the charger Exceeding this time can have two effects Loss of accuracy which will be most noticeable on the lowest range setting and possible shortening of battery life Full discharge of the battery should be avoided Multi cell nickel cadmium batteries such as the one provided with your Model 407A are prone to damage from cell reversal a phenomenon which occurs when such batteries are taken into deep discharge while under load POWER RANGE SELECTOR SWITCH The front panel knob has a total of 8 positions including an OFF position The meter should always be turned off when not in use in order to avoid battery drain 17 During use always adjust the scale setting starting from higher value scales in order to avoid unnecessary overdriving of the needle to beyond full scale MECHANICAL METER ZERO Directly below the meter
9. is a screw which allows the needle to be adjusted to read zero when the meter is off Normally the adjustment is not necessary but should be checked when the 407A is first uncrated and occasionally thereafter This adjustment I prerequisite to proper operation of the side panel zero knob Rear Panel Controls CALIB A 1 8 inch wide screwdriver will permit adjustment of the meter output Adjustments should only be attempted in conjunction with the instructions given in Chapter 5 of this manual SPEED An access hole on the back panel allows the meter speed up circuit to be adjusted to suit individual preference The potentiometer has been factory adjusted so that the response give maximum settling time and will give needle overshoot of about to 2 percent when the detector is suddenly exposed to an optical input The output signal from the head does not rise instantaneously when the detector is exposed to a laser beam Due to the mass of the absorbing material to which the thermopile is attached the output rise in an exponential manner with a time constant 0 63 percent of final value of about 1 second Several seconds are required for the output to stabilize at its final value Treating the output rise as purely expo nential an estimate of final value can be made very quickly by pass ing the signal through a compensating network in the display which is adjusted to match the detector s time constant In this way a final value can be
10. manual has been provided for information only and product specifications are subject to change without notice Any change will be reflected in future printings Newport Corporation 1791 Deere Avenue Irvine CA 92606 USA Part No H0407 1030 Rev K 111 Confidentiality 8 Proprietary Rights Reservation of Title The Newport programs and all materials furnished or produced in connection with them Related Materials contain trade secrets of Newport and are for use only in the manner expressly permitted Newport claims and reserves all rights and benefits afforded under law in the Programs provided by Newport Corporation Newport shall retain full ownership of Intellectual Property Rights in and to all development process align or assembly technologies developed and other derivative work that may be developed by Newport Customer shall not challenge or cause any third party to challenge the rights of Newport Preservation of Secrecy and Confidentiality and Restrictions to Access Customer shall protect the Newport Programs and Related Materials as trade secrets of Newport and shall devote its best efforts to ensure that all 1ts personnel protect the Newport Programs as trade secrets of Newport Corporation Customer shall not at any time disclose Newport s trade secrets to any other person firm organization or employee that does not need consistent with Customer s right of use hereunder to obtain access to the Newport Program
11. to come in contact with the plastic knobs e Do not attempt to clean the surface of the detector in the head CAUTION Only experienced service professional should attempt the fol lowing procedures For field replacement of the meter lamps or battery refer to the work to a qualified service professional experienced in repairing instruments of this type Opening the Display Unit Should you need to replace the meter lamp or the battery use the fol lowing procedure to open the unit and access the circuit board Take care not to scratch the plastic meter face Tools Required 1 4 nut driver 3 8 OD socket or a wide blade screwdriver e 1 Phillips screwdriver 1 16 hex driver 5 64 hex driver Procedure 1 Set the rotary switch to the OFF position 2 Pry the cap from the ZERP knob and use the 1 4 nut driver or a flat blade screwdriver to loosen the collet nut Remove the ZERO knob 3 Remove the screws from the back cover Corner screws are 3 mm Phillips head while those in the central area are 4 40 Button head or Torx head depending on the model and serial number 26 4 Remove the black flat head screw 36 32 and washer from the bail on that side of the unit in which the BNC receptacles and the charger jack are located 5 CAREFULLY tip the housing over just enough to allow one end of the circuit board to swing out of the housing Grasp the circuit board by its edges and continue to swing the b
12. 20 20 21 22 Introduction Equipment Required Procedure 6 SERVICE AND REPAIR Introduction Replacement Items Cleaning the Unit Opening the Display Unit Tools Required Procedure Reassembling the Display Unit Replacting Meter Lamps Replacting the Battery 7 CUSTOMER SERVICE Introduction Return Procedure Service Form 22 22 23 24 24 24 25 25 25 25 27 29 29 32 32 33 34 Safety Precautions Definitions and Symbols The following terms and symbols are used in this documentation and also appear on the Model 407A CW Laser Power Meter where safety related issues occur General Warning or Caution Figure 1 General Warning or Caution Symbol The Exclamation Symbol in the figure above appears on the product and in Warning and Caution tables throughout this document This symbol designates that documentation needs to be consulted to deter mine the nature of a potential hazard and any actions that have to be taken Electric Shock Figure 2 Electrical Shock Symbol The Electrical Shock Symbol in the figure above appears throughout this manual This symbol indicates a hazard arising from dangerous voltage Any mishandling could result in irreparable damage to the equipment and personal injury or death European Union CE Mark Figure 3 CE Mark The presence of the CE Mark on Newport Corporation equipment means that this instrument has been designed tested and certified compliant to
13. Department of Labor 400 Ist Street N W Washington C C 20001 14 E Installation Unpacking Your Power Meter When ordered as a complete set the Model 407A comes with the fol lowing components e Readout Assembly Readout Cable BNC 5 foot length Power Supply Charger 117 Vac or 220 Vac e Detector Head Assembly Detector Head Detector Base Detector Posts 1 4 20 tapped 1 2 inch O D 2 4 and 6 e Instruction Manual e Shipping and Storage Container If readout assembly or head assembly is ordered separately it will be shipped in a standard shipping container Assembly The Model 407A comes with a power supply in one of two standard voltages During use the power supply should be powered with proper ac voltages and plugged into the Model 407A readout in order to fully charge the rechargeable battery Normal recharge time for the battery is 14 16 hours Once the battery charger power supply is plugged in the Model 407A panel lights will be energized The lights will stay lit as long as the unit is plugged in If the light must be off or if portable operation is desired the Model 407A can be operated without its charger for up to 60 hours on a fully charged and healthy battery The Model 407A comes to you pre calibrated at the factory We use an NIST traceable standard detector at 810 nm as a laboratory cali bration reference from which all units are calibrated Select the telescoping 1 2 inch diamete
14. NSI ACGIH or OSHA standards listed at the end of this section for guidance on eye wear selection e Reduce the laser output power while aligning the Model 407A to the beam Beware of reflections from the Model 407A heat sink e Avoid blocking the laser output beam or its reflection with any part of the body e Establish a controlled access area for laser operation Limit access to those trained in the principles of laser safety e Post prominent warning signs near the laser operation area e Set up experiments so that the laser beam is not at eye level e Provide enclosures for beam paths whenever possible e Set up shields to prevent or block unnecessary specular reflections e Set up an energy absorbing target to capture the laser beam preventing unnecessary reflections or scattering 13 For information on regulations for laser safety consult the United States code of Federal Regulations Title 21 Chapter 1 Subchapter J Parts and 1040 10 and 1040 11 as applicable The Center for Devices and Radiological Health CDRH is the governing regulatory agency Sources of Laser Safety Standards Safe Use of Lasers Z1236 1 American National Standards Institute ANSI 1430 Broadway New York NY 10018 A Guide for Control of Laser Hazards American Conference of Governmental and Industrial Hygienists ACGIH 1014 Broadway Cincinnati OH 45202 Occupational Safety and Health Administration OSHA U S
15. YOU DO NOT DISTURB THE SETTINGS OF THE POTEN TIOMETERS LOCATED ON THE SOLDER SIDE OF THE BOARD Take care not to break the wire leads which connect the circuit board to the panel meter 24 3 Fit the metal nut bracket over the end of the board which con tains the BNC receptacles and the charger jack the bracket s tab rests in the shallow cutout at that end of the board Make sure that the piece of Kapton insulating tape is still on the underside of the bracket facing the solder side of the board 4 Keeping a finger on the nut bracket slide the circuit board sown into the housing at an angle Insert the BNC receptacles and the charger jack into the holes provided in the wall of the housing Continue to push the board until it stops against the wall of the housing At this point check to see that the meter lights will slide down between the panel meter and the housing Also make sure that the BATT LOW LED is straight in its socket The rest of the board now should be free to fall into place in the housing While swinging the board into place make sure that the BATT LOW LED fits into the hole provided for it in the front surface of the housing NOTE If for some reason the LED is removed from its socket it needs to be reinstalled the flat index mark on the LED should face AWAY from the rotary switch 5 On the outside of the housing above the charger jack insert the black plastic washer between the bail and the housing Then i
16. ctric equivalent 8099 Newport part number 3901 2040 Replacing the Battery When the battery no longer holds a charge or when the BAT LOW LED blinks continually even with the charger plugged in the battery should be replaced Not all 9 volt Nickel Cadmium rechargeable batteries are equiva lent Battery voltages of 8 4 and 7 2 volts are common Due to dif fering internal cell construction battery capacity and durability may vary between battery types The battery recommended by Newport is not damaged when the charger is left plugged into the display unit for long periods of time Newport recommends the following replacement battery for the Model 407A Varta V7 8R 8 4 volts 100mAh Newport part number 4006 0290 In replacing the battery follow the procedure given above for remov ing the circuit board from its housing and for reassembling the unit 29 WARNINGS DO NOT incinerate or mutilate batteries they will burst or release toxic materials DO NOT short circuit batteries this may cause burns Old and new batteries may be partially charged Be cautious during battery replacement and disposal WARNING Do not attempt to use a NiMH battery in your Model 407A Instrument The charging circurity only supports NiCd chem istry batteries and there is a severe risk of explosion or fire if a NiMH Chemistry battery is substituted CAUTION The use of shatterproof protective eyewear is recommended for the following steps
17. during the warranty period the product will either be repaired or replaced at Newport s option To exercise this warranty write or call your local Newport office or representative or contact Newport headquarters in Irvine California You will be given prompt assistance and return instructions Send the product freight prepaid to the indicated service facility Repairs will be made and the instrument returned freight prepaid Repaired products are warranted for the remainder of the original warranty period or 90 days whichever first occurs Limitation of Warranty The above warranties do not apply to products which have been repaired or modified without Newport s written approval or products subjected to unusual physical thermal or electrical stress improper installation misuse abuse accident or negli gence in use storage transportation or handling This warranty also does not apply to fuses batteries or damage from battery leakage THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE NEWPORT CORPORATION SHALL NOT BE LIABLE FOR ANY INDIRECT SPECIAL OR CONSEQUENTIAL DAMAGES RESULTING FROM THE PURCHASE OR USE OF ITS PRODUCTS First printing 2006 2010 by Newport Corporation Irvine CA All rights reserved No part of this manual may be reproduced or copied without the prior written approval of Newport Corporation This
18. e placed in the location where actual measurements will be made but with out any optical radiation applied 3 Rotate the power range knob to the 30mW setting Adjust the zero position as required using the zero adjust knob on the right side panel Once the most sensitive range has been adjusted all higher ranges will accurately read zero as well provided that the mechanical zero has been adjusted correctly with the display turned OFF 19 NOTE If the 407A is to be used on the 30 mW or 100 mW scales the detector may be sensitive to temperature fluctuations caused by air currents or air temperature change Therefore care should be taken to ensure that the detector is not subject to such fluctuations If necessary re zero the readout Reading the Meter The Model 407A features a taut band style analog meter for the fastest and most sensitive response An anticipation circuit 1s included which speeds up the natural response time of the detector The circuit normally provides a small amount or overshoot If the needle response is too fast or too slow for your needs the SPEED control may be adjusted See Chapter 3 for the adjustment procedure Warning on Measuring Pulsed Lasers Your Model 407A CW head is not designed to monitor pulsed lasers Even though average output power may be low the high energy high peak power pulses from some lasers Q switched lasers for example can cause irreversible damage to the detector in
19. f 1 to 2 orders of magnitude The second limitation to thermal detectors 1s that they respond to any heat source not only lasers This effect can be noticed on the most sensitive 30mW 100mW scales Noise in the form of drift or slow random motion can be caused by simply grasping the cooling fins with a hand or by blowing on the detector not recommended A more serious nuisance is drafts with the lowest scale take care to shield the detector head from large drafts 21 5 Calibration Introduction Your Model 407A is calibrated at the factory with 1 watt of laser power at 810 nm If re calibration is ever required the procedures given in this chapter allow you to work on your own Power is gener ally applied to the detector in form of laser radiation Sensitivity is adjusted with CALIB control and meter response rate is set with SPEED control Both controls are accessible through the rear cover of the display unit Equipment Required e Laser operating at desired wavelength and power good intensity stability makes the job easier e Laser goggles as required e Reference standard power meter calibrated at desired wavelength and power Screwdriver with 1 8 3mm wide blade e External laser beam block for setting SPEED control CAUTION Watch out for stray reflections NOTE Absorptance by the detector s surface is a function of the laser wavelength being measured see Figure 1 1 This variation in
20. h in Microns Figure 1 1 10 Model 407A Specifications Physical Specifications Detector Diameter Sensitivity Variation Lo ee 250nm 11 um Calibration Accuracy For 1 W 810 nm Detector Spatial Sensitivity Variation using a 2mm beam Maximum pk pk Noise amp Zero Drift per Minute LE Meter Time Constant NN Battery Charge 60 hr minimum Electrical Requirements 11 Physical Dimensions Display Detector Head win 1750m 68m 6 3 om Dia 2 5 in 9 5 cm 3 75 in Adjustable from 8 9 to 21 1 cm 3 5 to 8 3 in to center of detector 5 8 cm 2 28 in 3 4 cm 1 3 in 0 6 kg 1 4 lbs 0 3 kg 0 7 Ibs Distance to Detector Surface D 12 2 Laser Safety CAUTION While the Model 407A does not emit laser radiation it is designed to work with Class IV High Power Lasers whose beams are by definition safety and fire hazards Take precau tions to prevent accidental exposure to both direct and reflected beams Diffuse as well as spectacular reflections can cause severe eye or skin damage Precautions for the Safe Operation of Class IV High Power Lasers e Keep the chassis housing and covers on the laser and the Model 407 A at all times Avoid looking at the laser output beam even diffuse reflections for example off the detector surface are hazardous e Use protective eyewear at all times selection depends on the wavelength and the visual function required Consult the A
21. he meter reading to settle to its final value Adjust the ZERO control if neces sary 8 Remove the beam block once again and verify the meter reading for laser power 9 Recheck the meter zero block the beam 10 Meter response rate can be varied by adjusting the SPEED control This control is accessible through the rear cover to the display unit For heads and displays sold together as matched serial numbers the SPEED control is adjusted at the factory to give 1 to 2 percent over shoot in the meter s response This amount of overshoot allows reasonable meter response rate with minimum settling time and provides acceptable noise performance at low power settings 23 The SPEED control can be adjusted as follows a Set the laser power to give meter pointer deflection of approxi mately 90 percent full scale upper scale Block the laser beam and let the meter reading return to zero Unblock the beam and note the meter response Overshoot can be measured by counting the small divisions on the upper scale between the maximum pointer excursion and the final resting position Each small division on the upper scale corresponds to 2 percent of the full scale For example 2 divisions of overshoot corresponds to 4 percent overshoot Adjust the SPEED control to give the desired meter response rate Clockwise rotation of the control when viewed from the rear cover gives faster meter response to change in detector heating
22. mbers It is recommended that the supply is left plugged in during normal operation The Model 407A has been designed to permit indefinite battery charging without damage to bat teries or the charging circuit NOTE If you desire NOT to have the meter illuminated you must unplug the supply A separate light switch was not supplied in order to avoid inadvertent draining of the battery by using the lights without the charger operating 16 HEAD The detector head uses a standard BNC type connector which connects to the bottom jack labeled HEAD Inadvertent cross con necting between the HEAD and RECOUT should be avoided but should cause no harm to the Model 407A ZERO The zero knob is connected to a 10 turn potentiometer The zero adjust circuit has been carefully designed so that once the meter has adjusted to read zero on the most sensitive scale the readout will be correctly zeroed for all other scales the mechanical meter zero described below must also be properly adjusted Re zeroing as scales are changed is thus unnecessary Note however that on the most sensitive scales some drift will occur if the detector is subjected to thermal variations such as air drafts Front Panel Controls BATT LOW If the Model 407A is used without its charger the BATT LOW light will begin to blink Approximately once every two sec onds when the battery has drained to the point that it must be recharged At this time you should plug the charger
23. nsert the black flat head screw enough to engage it in the threads of the nut but do not tighten it yet 6 Replace the back cover and loosely install the 4 button head screws through the central holes and into the threaded standoffs of the circuit board inside 7 Reinstall the ZERO control knob on the shaft letting 7 16 11m of the knob s end protrude from the outside wall of the housing Replace the knob cap at this time 8 Position the circuit board using the BNC receptacles and the ZERO knob so that the ZERO and the rotary switch knobs are able to rotate freely in their holes Then tighten the 4 button head screws 28 9 At the end of the housing which contains the metal nut bracket install 2 of the 3 mm Phillips head screws at the corners of the back cover engaging the nuts in the bracket inside Tighten the screws evenly in order to keep the bracket inside as level as pos sible 10 Install the remaining 3mm Phillips head screws in the corners of the cover 11 Tighten the black flat head screw which retains the bail Replacing Meter Lamps The meter is illuminated by two lamps when the charger is plugged in To change lamps follow the procedures given above for removing the circuit board from its housing Then unplug the lamps from their socket and replace with new ones We recommend that you replace both lamps at the same time Reassemble the unit using the proce dure above The meter lamps are General Ele
24. oard until the rotary knob clears the housing Avoid touching the circuitry on the board so as not to contaminate it with finger oils Now slowly pull the board out of the housing being careful not to break the wire leads which connect the circuit board to the panel meter The metal nut bracket will fall loose at this time WATCH THAT YOU SO NOT DISTURB THE SETTINGS OF THE POTENTIOMETERS LOCATED ON THE SOLDER SIDE OF THE BOARD 6 Taking care not to damage the meter face set the housing to one side and position the board so that it rests on 1ts standoffs on a smooth non conductive surface Should the wire leads between the circuit board and the meter break you may carefully solder them back in place If you need to solder one of the meter terminals clamp the terminal with a hemostat below the point at which you want to solder The hemostat will act as a heat sink and prevent softening of the meter case at the entry point of the terminal On the circuit board end the red wire is connected at the hole marked M2 and the black wire is connected at the hole marked M1 Do not apply excessive heat to the circuit board as this may cause lifting of the pads and traces Reassembling the Display Unit 1 Make sure that the rotary switched on the circuit board is in the OFF position fully counterclockwise 2 Pick up the circuit board by its edges and orient it so that the component side faces the inside of the housing WATCH THAT
25. ollowing conditions Is the system used for manufacturing or research and develop ment What was the state of the system right before the problem Have you seen this problem before If so how often Can the system continue to operate with this problem Or is the system non operational Can you identify anything that was different than before this problem occurred 32 Technical Support Contacts North America Asia Europe Newport Corporation Service Dept Newport MICRO CONTROLE S A 1791 Deere Ave Irvine CA 92606 Zone Industrielle Telephone 949 253 1694 45340 Beaune la Rolande FRANCE Telephone 800 222 6440 Telephone 33 02 38 40 51 56 Asia 253 Aidu Road Bld 3 Flr 3 Sec C Shanghai 200131 China Telephone 86 21 5046 2300 Fax 86 21 5046 2323 Newport Corporation Calling Procedure If there are any defects in material or workmanship or a failure to meet specifica tions promptly notify Newport s Returns Department by calling 1 800 222 6440 or by visiting our website at www newport com returns within the warranty period to obtain a Return Material Authorization Number RMA Return the product to Newport Corporation freight prepaid clearly marked with the RMA and we will either repair or replace it at our discretion Newport is not responsible for damage occurring in transit and is not obligated to accept products returned with out an RMA E mail rma service newport com When calling Newpor
26. on of the incident radiation at the front surface of the detector The degree to which the radiation is absorbed will depend on the spectral absorptance of any coating applied A perfectly absorbing surface is one which absorbs 100 of incident radiance for all wavelengths this is known as a blackbody Surfaces which uniformly absorb radiation of all wavelengths but which absorb less than 100 are known as greybodies In reality surfaces are generally colored bodies since they reflect some radiation and the fraction reflected is a function of wavelength All thermal detec tors have this feature Good detector coatings maximize the absorp tance and minimize the variation of absorptance with wavelength The type of thermal detector used in the Model 407A is known as a thermopile A thermopile is essentially an organized collection of thermocouple junctions connected electrically in series A thermocou ple consists of a junction og two dissimilar metals This dissimilar metal junction has the property that a temperature dependent electri cal potential difference is deveolped across trhe junction due to the difference in the electronic solid state properties of the component metals This is known as the Seebeck effect A useful detector is made by isolating a reference junction from tem perature change and then measuring the voltage difference between the reference and the signal junctions as the signal junction tempera ture is
27. quipment may present additional hazards to you Contact Newport technical support for advice before attempt ing to plug in and operate damaged equipment CAUTION The user is advised to save the packaging material in case the A unit has to be shipped to a different location The packaging material is specially designed to protect the unit during ship ping WARNING AN To avoid electric shock and potential damage to the instru ment use only the detachable power supply provided with your instrument Do not substitute third party power supplies WARNING To avoid electric shock and potential damage to the instru ment be sure the detachable power supply is appropriate for use with the available MAINS power If your instrument s power supply is marked for use with nominal 110 VAC power do not connect it to 220 240 VAC power 1 Introduction Theory of Operation The detection and measurement of laser power can be classified under two headings photon detection and thermal detection Photon detec tion such as silicon photocells directly converts the energy of individ ual photons into a voltage or a current depending on internal con struction The present discussion will focus on thermal detectors since the Model 407A uses one type of thermal detector Thermal detectors have the common property that they convert light into heat and then convert the heat into a useable electric signal Light id converted to heat through absorpti
28. r post which is appropriate for your laser set up Note that the rods are compatible with standard lab oratory mounting rods and can be used in combination with any exist 15 ing hardware Observe that the rod can be threaded onto 1 of 2 dif ferent 1 4 20 UNC threaded studs located 180 degreed apart on the detector head This feature allows the user to conveniently work with beams incident from either the left or right because the cable can be routed to the front or rear as necessary If the telescoping rods are too long for a tight space the head has flats onto it which facilitate placing it directly on any flat surface The beam height above the flat to the detector centerline is 1 18 inches 4 Operation Location and Description of Controls Side Panel Controls REC OUT A standard BNC type connector be can be attached in order to display the output signal on a oscilloscope or a strip chart recorder or can serve as an input to a computer s A D channel The output impedance is 10 KO The range is 0 1 volts with 1 volt repre senting the full scale value on the analog meter CHARGE A 15 volt direct current power supply is supplied standard with all Model 407A power meters Two variations are supplied a 110 volt ac supply for U S A Canada and Japan and a 220 volt ac for Europe Gin U K contact your local Spectra Physics office for availability of domestic power supplies See Chapter 6 for ordering information and part nu
29. s and Related Materials These restrictions shall not apply to information 1 generally known to the public or obtainable from public sources 2 readily apparent from the keyboard operations visual display or output reports of the Programs 3 previously in the possession of Customer or subse quently developed or acquired without reliance on the Newport Programs or 4 approved by Newport for release without restriction Service Information This section contains information regarding factory service for the source The user should not attempt any maintenance or service of the system or optional equipment beyond the procedures outlined in this manual Any problem that cannot be resolved should be referred to Newport Corporation 1V Table of Contents SAFETY PRECAUTIONS 1 INTRODUCTION Theory of Operation Features of the Model 407A Specifications Physical Specifications Outline Drawings 2 LASER SAFETY Precautions for the safe operation of CLASS IV High Power Lasers Sources of Laser Safety Standards 3 INSTALLATION Unpacking the Power Meter Assembly 4 OPERATION Locations and Description of Controls Side Panel Controls Front Panel Controls Rear Panel Controls Operating Instructions Turning on the Model 407A Zeroing Procedure Reading the Meter Warning On Measuring Pulsed Lasers Limitations On Use Of Thermal Detectors 5 CALIBRATION 11 11 12 13 13 14 15 15 15 11 16 16 17 18 19 19 19
30. t s terminals Use one hand to grasp the circuit board by the edges Use the index and the middle fingers of the other hand to restrain the battery mount s terminals while pushing on the end of the battery with the thumb of that same hand Reinstall the circuit board following the procedure given in the section at the beginning of this chapter WARNING Battery Disposal DO NOT PLACE USED BATTERIES INTO THE NORMAL WASTE DISPOSAL STREAM The Model 407A s battery contains Cadmium a heavy metal that can have serious environmental impacts if it is placed into the normal waste dis posal stream For this reason used batteries must EC be separated from normal trash and recycled Dispose of used batteries in accordance with local waste regu lations Within the European Union and other jurisdictions with mandated Take Back regulations contact your local Newport sales office or representative for information on where to send used batteries for proper disposal and recycling 31 7 Customer Service Introduction To obtain information regarding factory service contact Newport Corporation s Service Department or your Newport representative Please have the following information available Instrument model number on the rear panel Instrument serial number on rear panel Description of the problem Your contact information To help our Technical Support Representatives diagnose your prob lem please note the f
31. t Corporation please provide the customer care representative with the following information e Your Contact Information e Serial number or original order number Description of problem i e hardware or software To help our Technical Support Representatives diagnose your problem please note the following conditions e Is the system used for manufacturing or research and development e What was the state of the system right before the problem e Have you seen this problem before If so how often e Can the system continue to operate with this problem Or is the system non operational e Can you identify anything that was different before this problem occurred 33 ND Newport Experience Solutions Service Form Newport Corporation USA Office 800 222 6440 FAX 949 253 1479 Name Return Authorization Company Address Date _ gt S o Country Phone Number P O Number Fax Number Item s Being Returned Model Serial ASS 35 Newport Corporation Worldwide Headquarters 1791 Deere Avenue Irvine CA 92606 In U S 800 222 6440 Tel 949 863 3144 Fax 949 253 1680 email sales newport com ND Newport Experience Solutions Visit Newport Online at www newport com Newport Corporation Irvine California has been certified compliant with ISO 9001 by the British Standards Institution
32. the Model 407A due to excessive instantaneous local heating of the detector surface Pulsed laser power is best measured using a detector designed for that application NOTE Replacement of the detectors which have been damaged by pulsed laser beams is not covered under warranty Use the following peak power density specifications to help you decide if the Model 407A is suitable to use in your application Specification Model 407A Max Peak Energy Density 0 3 J cm2 50 nsec pulse The Model 407A is NOT recommended for use with low repetition rate high energy pulsed lasers Consult Newport about your particu lar application before monitoring pulsed lasers 20 Limitations on Use of Thermal Detectors Thermal Detectors convert light into heat which in turn generates a change in temperature In case of thermopiles the change in tempera ture 1s relative to a second set of junctions held at a reference temper ature This is significant for two reasons First 1f the reference tem perature itself changes then the output signal may contain a spurious component For instance 1f the detector is subjected to high incident power for a prolonged period the entire head including the reference junctions will warm up If the detector then is subjected to a weak incident beam the power reading may drift as the reference junction adjusts to a cooler equilibrium state This effect is temporary and may only be noticeable with power changes o
33. varied with the two junctions wired in series Features of the Model 407A The Model 407A Power Meter features a redesigned thermopile detec tor that withstands 20 KW cm2 average power density The result is a robust detector suitable for the high average power density generated by modern ion lasers The Model 407A detector is capable of measur ing power from a few milliwatts up to gt 20 Watts The cw detector head has been tested at up to 30 W with no significant loss of linearity In the 20 to 30 W range the primary limitation on performance is case temperature However care should be taken not to focus high power laser beams on the detector For further discussion see Chapter 4 Limitations on Use of Thermal Detectors While the Model 407A is designed to measure cw laser power average power output of some pulsed lasers can be measured High peak pow ers can damage the detector so care must be taken when considering use of the Model 407A in this application Refer to Chapter 4 Operation for more information The meter and head are quite compact and robust Thus the Model 407A can be transported easily 1t will even fit in a briefcase And it can fit into tight places The Analog meter is illuminated by two lamps whenever the charger is plugged in allowing you to work in dark conditions Detector Absorbtance as a Function of Wavelength 0 95 09 NL 0 85 0 8 0 1 2 3 4 5 6 7 8 9 10 11 Wavelengt
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