SYNRAD Power Wizard PW-250 Operating Instructions
Contents
1. Rev 2 21 Oct 2009 P N 900 00005 02 Power Wizard PW 250 Operating Instructions cont Power measurements 1 Hold the PW 250 so that the LCD display is in your hand with the black anodized target facing away from you 2 Press and hold the RESET POWER button for at least two seconds This activates the PW 250 and initializes the measurement computer 3 Release the RESET POWER button to begin the six second measurement sequence The LCD display should read 00 0 Watts 00 3 W If the reading is not within this range repeat Step 2 4 Quickly insert the PW 250 target into the beam path Position the PW 250 so the beam is centered in the middle of target and hold the PW 250 as steady as possible Take all power measurements at a point in the beam path where the laser beam is unfocused To prevent damage to the PW 250 never measure a laser beam at the point possible of focus equipment damage damage internal components Do not use the Power Wizard to measure power levels exceeding 250 watts as this may Note Avoid moving the target after insertion into the beam path Excessive target motion may result in an erroneous power reading 5 The Power Wizard s LCD display will show readings increasing to the final value within three to four seconds after insertion into the beam amp Remove the PW 250 from the beam path when you hear a series of five beeps This indicates the measurement se quence is complete and begins a 12 152. average power density KW era 20 Max peak energy density J cm 1 Max target temperature O 180 Typical target temperature rise per measurement C W cecsecssesseessesseeseeseees 0 4 Battery life ty psy csctsee teins tgsoutedeeu ss 5 years O swag E asta A estates 25 000 readings Battery type 3 each CR2025 Lithium Auto shut off time seconds 25 Data hold time seconds 15 Sizes Mi ada 159 x 30 x 12 Welght Elirisai nana 80 specifications subject to change without notice 1 Typical absorption curve supplied with each meter 2 Damage to coating may occur above this value 3 For pulsed lasers and 50 ps pulse width 4 After release of RESET POWER button Declaration of Conformity Declaration of Conformity in accordance with ISO IEC 17050 2 2004 We Manufacturer s Name SYNRAD Inc Manufacturer s Address 4600 Campus Place Mukilteo WA 98275 U S A hereby declare under our sole responsibility that the following equipment Product Name Power Wizard Model Number PW 250 conforms to the following Directive s and Standard s Applicable Directive s 2004 108 EC Electromagnetic Compatibility Directive Applicable Standard s EN 61000 6 3 2001 Generic Immunity and Emissions EN 55011 1998 Conducted and Radiated Emissions Class A EN 50082 1 1997 RF Electromagnetic Immunity IEC 1000 4 2 1995 Electrostatic Discharge Immunity IEC 1000 4 3 1995 RF
3. second hold sequence Note The hold feature locks the displayed power reading for a period of 12 15 seconds after the measurement sequence is complete This allows the PW 250 to be inserted into areas where it is difficult or dangerous to visually monitor the LCD display while the laser is operating 7 After the 12 15 second hold sequence a series of fast beeps indicates the PW 250 is automatically shutting down 8 To perform another power measurement repeat Steps 1 6 Measurement notes guidelines e The heat capacity of the target is sufficient to allow multiple low power measurements in rapid succession without im mediate cooling On a 25 W laser approximately ten consecutive readings may be taken About two measurements in rapid succession can be taken on a 100 W laser Only a single measurement can be taken around the 250 W level before the unit must be allowed to cool e When using the PW 250 on medium power lasers in the range of 100 watts or more caution should be exercised not to overheat the sensor or case by excessive exposure time An overheated target is indicated by continuous beeping at which time the target must be allowed to cool You can accelerate cooling by placing the PW 250 under a fan Do not cool the PW 250 by immersing it in water this will damage the electronics e Use care to place the beam on the target rather than the PW 250 case Move the PW 250 in and out of the beam quickly without letti
4. Electromagnetic Fields Immunity IEC 1000 4 4 1995 Electrical Fast Transient Burst Immunity Corporate Officer European Contact Excel Technology Europe GmbH 20 a Miinchner Str 2a D 82152 Planegg Dave Clarke President of SYNRAD Inc Germany Dated 01 September 2009
5. SYNRAD An Excel Technology Company SYNRAD Inc 4600 Campus Place Mukilteo WA 98275 tel 1 425 349 3500 fax 1 425 349 3667 e mail synradOsynrad com web www synrad com Power Wizard PW 250 Operating Instructions Important Note Power Wizard power meters are designed as diagnostic and service tools for verifying laser power They are not intended for use in validating critical process parameters and should not be used in such applications Note Read these instructions thoroughly before using the PW 250 Certain steps in the measurement process must be made in a timely manner to prevent erroneous power readings Setup 1 Position a beam block in a manner that prevents the laser beam from traveling beyond the work area during power measurements 2 Ensure that all personnel in the area are wearing the appropriate protective eyewear 3 Apply power to the laser Enable lasing just as you are ready to begin power measurements A Danger Direct or diffuse laser radiation can inflict severe bodily damage including but not limited to permanent eye damage or blindness and severe burns to human or animal tissue Always wear the appropriate eye protection when in the same area as an operat ing laser Do not allow a direct or reflected beam to contact a person Always be aware of the laser s beam path when using a laser power meter and always use a beam block to prevent the beam from traveling beyond the intended work area
6. ccuracy at the 10 6 micron um CO wavelength with calibration trace able to the National Institute of Standards and Technology NIST Maintenance PW 250 battery life is approximately five years even with constant use for a capacity of about 25 000 measurement cycles Current drain of the unit is less than 0 5 mA Replace batteries when BAT appears on the LCD display To access the three CR2025 lithium batteries remove the three screws on the rear half of the PW 250 case and lift the rear cover away DO NOT remove the screws on the front display side Warranty The PW 250 is warranted for twelve 12 months from the date of purchase provided it is used per the operating instruc tions described above SYNRAD Inc is not responsible for damage caused by improper use particularly water immersion or overheating SYNRAD Inc will repair or replace at no charge any PW 250 that fails due to manufacturing or design defect Defective unit must be returned to SYNRAD Inc freight prepaid Prior to returning the unit you must first obtain a Return Authorization RA number by calling SYNRAD Customer Service at 1 800 796 7231 outside the U S at 1 425 349 3500 or fax to 1 425 349 3667 Theory of operation The PW 250 uses a patented measurement principle to achieve unprecedented convenience and performance The unit measures the rate of change of temperature both heating and cooling induced in an aluminum mass by incident laser power A s
7. g can be recorded After 12 15 seconds a series of fast beeps indicates the PW 250 is automatically shutting down Power Wizard PW 250 Operating Instructions cont The useful temperature range of the target is 0 150 C 32 302 F Accurate measurements can be performed at any tem perature in between Damage to the target and sensor can occur if the temperature of the target exceeds 180 C 356 F The PW 250 will beep continuously if the target temperature exceeds 150 C 302 F The target s absorption is relatively constant as a function of wavelength see Figure 1 No calibration factors are required when using the PW 250 with CO YAG near IR diode Visible or Excimer lasers because the change in target absorption is less than 3 When using the PW 250 with Carbon Monoxide CO lasers multiply the displayed reading by a factor of 1 03 for improved accuracy Target Absorbtion VS Wavelength Absorbtion Wavelength in microns Figure 1 Target absorption versus wavelength Specifications Range 3 1 2 digits eneen 1 250 W AI A a 0 1 W Wavelength range nenen 190 nm 11 um Individual calibrated wavelength 10 6 pm Target absorption 190 nm 1 1 pm 9 11 pm ee 0 96 0 99 Target absorption 190 thin I im 0 93 0 99 PN CCUTAGCY ia teren 5 Target diameter mm 22 Settling time seconds lt 4 Max allowable input power single application W 0 300 Max
8. ng the beam dwell on the case It is permissible to turn on the laser after the PW 250 target has been placed in the beam path however be sure the measurement is complete before the six second measurement period has elapsed Never press the RESET POWER button while the target is exposed to the laser beam the computer will not be initialized properly Power Wizard PW 250 Operating Instructions cont e The PW 250 can be used to measure laser power anywhere along the beam path including between a focusing lens and work piece and can be used to measure power emitted from optical fibers Important Note While the PW 250 target has a very high damage threshold the target should never be placed at the focal point of a lens Place the PW 250 target either in front above or behind below the beam s focal point thus minimizing power density without overfilling the target area The maxi mum allowable power density at the target is 20 kW cm exposure to power densities above this value may damage the target leading to loss of accuracy and calibrated performance e Erroneous readings may indicate one or more of the following conditions exists a the PW 250 was not reset for at least two seconds b the target is not being held stationary in the beam path c the beam is not completely within the target area d laser power is fluctuating too rapidly or e the PW 250 is malfunctioning Calibration Each PW 250 is individually calibrated to 5 a
9. ophisticated analog computer evaluates the temperature of the probe the cooling rate before laser application and the heating rate of the probe during laser application Knowledge of these three values is sufficient to compute incident power using mathematical formulas regardless of the target s immediate thermal history Upon activating and initializing the computer by pressing and holding the RESET POWER button for two seconds the present cooling rate of the laser target is stored into memory If the target was not previously exposed the current cooling rate is zero Releasing the RESET POWER button starts a timer that produces an audible beeping signal after approximately six seconds During the six second measurement window the target is exposed to laser power and the heating rate is then calculated The calculated power value based on the stored cooling rate and present heating rate is continuously updated on the LCD display When the heating rate settles and stabilizes about three seconds after exposure the correct power reading is displayed The thermal settling rate is sufficiently shorter than the six second timing sequence to allow adequate time to place the target into the beam and allow stabilized conditions to be reached After the timing sequence has elapsed indicated by a series of beeps the power reading remains locked on the LCD display for a period of 12 15 seconds so the PW 250 can be removed from the laser beam and the readin
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