843-R_Power_Meter_User_Manual
Contents
1. Press this for previous set of Needle functions e Zoom Press this key to focus the Bargraph on the present reading The Bargraph will show 20 of the full scale centered on the present reading Thus if the full scale of the Bargraph is 20 mW and your reading is 15 mW pressing Zoom will make the Bargraph scale range between approximately 13 and 17 mW Small fluctuations in power are more easily seen in this mode fo will be reverse highlighted to show that it is active Press the Zoom key again to return to the unexpanded Bargraph display e Offset If the ambient environment has a thermal background so that the 843 R shows a nonzero power reading even when there is no laser you can subtract the background using the Offset function For example the 843 R display reads 0 1 mW when the laser is blocked and 20 5 mW with laser power applied In this case the true power is 20 5 0 1 20 4 mW To subtract the background press the Offset key while the laser is blocked The 843 R will now read zero and the 0 1 mW background will be 53 subtracted from all subsequent readings The laser power reading displayed will thus be 20 4 mW When active the key is reverse highlighted and the offset that is being subtracted is shown in the upper right part of the screen To deactivate press Offset again If you suspect that the 843 R has a permanent zero offset the instrument s internal zero should be reset See Section 3 5 52. PD Photodiode PF volume absorber for short pulses and high average powers BB broadband surface absorber high power density 64 Note For more detailed and exact specifications see the 919P series product web site Absorber Max Energy Density J cm Type Pulse Length tons ts 300s P o oo 0 e 3 5 J5 BBC os o5 f 3 x os o9 7 Table 6 Maximum Energy Densities for Various Absorbers Single pulse Note The CW power damage threshold in W cm is found on the right hand side of the table at the 1s pulse width value Power Density in Wicm Graph 4 Pulsed Laser Damage Threshold for Thermal Sensors 7 3 Photodiode Sensor Specifications Please refer to the respective product web site for the latest Newport photodiode sensor specifications 7 4 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 65 shipment If found to be defective 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 indica
3. Photodiode Thermopile and Half 17 hours Photodiode Thermopile and Full 15 hours Photodiode The battery charge is indicated by the ii icon The battery charge is shown approximately by each segment of the icon e g if 2 segments are shown the battery is full When the battery is charging the segments turn on in sequence When the battery is low the charger should be plugged in 3 7 3 Analog Output The instrument provides an analog voltage output via the 2 5mm stereo plug on the rear panel marked AN OUT see Figure 3 3 The 843 R is supplied with the mating adapter plug that connects to this socket The analog output is useful for driving chart recorders and other analog devices The voltage is proportional to the reading on the display and scaled such that full scale equals 1 00V The analog output is driven through an impedance of 100 ohm For best accuracy is recommended to limit the external load to 100K or larger A smaller load down to 1K is possible but may result in loss of accuracy 12VDC AN OUT SENSOR INPUT USB OTG Figure 3 3 843 R Rear Panel View In power mode the analog output is continually updated 15 times per second with the latest power measurement 22 For thermal sensors in single shot energy mode the analog output is held fixed until the next pulse triggers 3 7 4 Field Upgrade The 843 R has all of the necessary infrastructure for field upgrading of the embed
4. e Setup Press this key to change the Energy measurement parameters This will be described in Section 4 4 4 Energy Setup Screen 41 Right Arrow Press this for additional Needle screen functions Range 1 00J 919P 020 12 SN 660052 Laser 971 Threshold MEDIUM 0 4 0 6 0 2 0 8 1 lt WH 0 712 Zoom Offset ER Figure 4 9 Needle display with second set of Softkeys and Persistence active Left Arrow Press this for previous set of Needle functions Zoom Press this key to focus the Needle on the present reading The Needle arc will show 20 of the full scale centered on the present reading Thus if the full scale of the Needle is 30 Joules and your reading is 15 Joules pressing Zoom will make the Needle scale range between approximately 12 and 18 Joules Small fluctuations in energy are more easily seen in this mode fqn will be reverse highlighted to show that it is active Press the Zoom key again to return to the unexpanded Needle display Offset Unlike power offset subtraction is not necessary to achieve accurate energy measurements However it can be used to facilitate comparison between readings For example the first laser pulse is 1 Joule To subtract this from future readings press the Offset key If the next pulse is actually 3 Joules 2 Joules will be displayed on the screen thereby indicating the difference between the two laser pulses 42 When active the key is r
5. 5 3 3 Power Setup Screen The 843 R Power Meter can be set to various chosen settings while operating These configuration settings are automatically saved for the next time the meter is turned on with this sensor TECH SOOUW 43104 Laser 1064 S N 91234 Filter IN Calibrated Average NONE Oct 29 2012 Show Settings Yes Line Frequency 50Hz 918D SL OD3 Mari21i2013 12 11 S N 11572 Calibrated Nov 04 2011 Setto expected laser power Select autoranging if unknown or laser power varies widely Figure 5 5 Setup Screen 5 3 3 1 Power Range Autorange In autorange mode you do not have to change scales When the reading of the meter is more than 100 of full 54 scale of the present range the 843 R will reconfigure itself to the next higher range The ranges are arranged in factors of 1 10 100 etc When the reading falls below 9 of full scale of the present range the 843 R will reconfigure itself one range down This change only occurs after a few seconds delay thereby providing overlap hysteresis that limits the 843 R from flipping back and forth when reading close to the end of the scale Manual Range There are certain disadvantages to autorange since it changes scale even if you don t want it to do so If you want to measure in the same range all the time it is better to use manual range The correct range to select is the lowest one that is larger than the largest expected measurement
6. Logarithmic Scale The 843 R allows the measurement to be made in units of dBm that is a logarithmic scale This is useful if you expect the readings to vary over several ranges and want to everything in one scale The formula for dBm units is defined as 10 x Log reading in mW Therefore at 1mW the reading will be 0 dBm at 10mW it will be 10 dBm at 100mW it will be 20 dBm etc To Set the Power Range 1 Press the Down arrow until Range is highlighted and press the Enter arrow 2 Using the Down arrow scroll through the available ranges until you reach the one that is correct for your measurement needs 3 Press the OK key to keep the new setting 55 5 3 3 2 Laser Photodiode sensors have a different sensitivity at different wavelengths Moreover the filters used in the sensor have a different transmission at different wavelengths In order to compensate each sensor has a built in calibration curve with 1nm resolution over the entire measurement range When you choose the correct laser wavelength the correction factor for that wavelength is automatically introduced To set type of laser being used 1 Press the Down arrow until Laser is highlighted and press the Enter arrow 2 Using the Down arrow scroll through the available lasers until you reach the appropriate laser wavelength 3 If your wavelength is listed use the Down arrow to scroll through the wavelengths until rea
7. The 843 R has built in circuitry to screen out electrical noise from the local power grid that can introduce errors to the measurements Set Line Frequency to your power grid s frequency to screen out the noise correctly 1 Press the Down arrow until Line Frequency is highlighted and press the Enter arrow 2 Set to 50Hz or 60Hz depending on the electrical power grid of the area that you are in 3 Press the OK key to keep the new setting Clock Settings The 843 R is equipped with a real time clock which will show the date and time This clock will also allow the 843 R to query the sensor attached and notify you if the sensor is due for calibration To set Date and Time 1 Press the Down arrow until the Date and Time are highlighted and press the Enter arrow 2 Scroll through and select Month Day Year Hour and Minutes with the Right arrow Change the selected item with the Down arrow 3 When finished press the OK key to keep the new setting 5 3 3 6 Additional On Screen Information On the right hand side of the Setup screen the following information is provided to the user e Instrument o Firmware Version o Serial Number 59 o Date of Last Calibration e Sensor o Name o Serial Number o Date of Last Calibration if supported by the sensor 5 4 Special Cases of Power Measurement 5 4 1 Measuring dB loss using the dB Offset function Since dBm is a logarithmic measurement t
8. and Minutes with the Right arrow gt Change the selected item with the Down arrow 3 When finished press the OK key to keep the new setting 4 4 4 5 Additional On Screen Information On the right hand side of the Setup screen the following information is provided to the user e Instrument o Firmware Version o Serial Number o Date of Last Calibration e Sensor o Name o Serial Number o Date of Last Calibration if supported by the sensor 46 Chapter 5 Operation with Photodiode Sensors Warning Before using the sensor for power measurement check that your laser power or energy and energy density does not exceed the sensor ratings See Table 7 in Chapter 7 5 1 Photodiode Sensors When a photon source such as laser is directed at one of the 918D or 818DB series photodiode detectors a current is created proportional to the light intensity and dependent on the wavelength The 843 R Power Meter amplifies this signal and indicates the power level received by the sensor Due to the superior circuitry of the 843 R the noise level is very low and the 918D 818 series sensors with the 843 R meter have a large dynamic range from nanowatts to 2 watts Newport s 818 and 918D series photodiode sensors come with an attenuation filter while the 818 xx L FC DB series low cost fiber optic detectors do not Some of the 819C D series integrating sphere detectors utilize the 918D series detector which has an integrated f
9. 843 R Power Meter all adjustments including zeroing internal circuits are done from the software This ensures simple and accurate realignment It is recommended to re zero the 843 R Power Meter every 2 months for best performance The simple zeroing procedure follows To zero instrument 1 If a sensor is connected disconnect it 2 Press the Zero key to enter the Zeroing screen 3 Make sure that the instrument is not in an electrically noisy environment and is undisturbed 4 Press the Start key and wait for message Zeroing completed successfully 5 Press the Save key to save the new zero settings 6 Press the Exit key to return to the Setup screen Note for Thermal Sensors only For best results with thermal sensors it may be necessary to do the procedure once with the sensor disconnected and a second time with it reconnected After completing steps 1 6 above Connect the sensor and make sure it is at room temperature and well shielded from any stray thermal power It may be best advised to lay the sensor with the absorber face down on the table 7 Connect the thermopile sensor Ensure that is at room temperature and well shielded from any stray thermal power It may be best advised to lay the sensor with the absorber face down on the table Press the Zero key to enter the Zeroing screen 8 Press the Start key and wait for message Zeroing completed successfully Press the Save key to save the new zero se
10. Power measurement mode e Display Press this key to change the graphical display o Press the Up Down arrow to set the display mode to Bargraph or Needle o Press OK to return to the measurement screen with the new selection o Press Cancel to ignore any changes and continue with the Bargraph display 29 Setup Press this key to change the Power measurement parameters This will be described in Section 4 3 3 Power Setup Screen Right Arrow Press this for additional Needle screen functions Range AUTO 919P 020 12 SN 660052 Laser 971 Figure 4 4 Needle display with second set of Softkeys and Persistence active Left Arrow Press this for previous set of Needle functions Zoom Press this key to focus the Needle on the present reading The Needle arc will show 20 of the full scale centered on the present reading Thus if the full scale of the Needle is 20 watts and your reading is 15 watts pressing Zoom will make the Needle scale range between approximately 13 and 17 watts Small fluctuations in power are more easily seen in this mode fo will be reverse highlighted to show that it is active Press the Zoom key again to return to the unexpanded Needle display Offset If the ambient environment has a thermal background so that the 843 R shows a nonzero power reading even when there is no laser you can 30 subtract the background using the Offset function For example the 843 R di
11. is highlighted and press the Enter arrow 1 Set to Yes to display sensor settings in the measurement screens Set to No to hide the sensor settings and show a larger graph Press the OK key to keep the new setting Line Frequency The 843 R has built in circuitry to screen out electrical noise from the local power grid that can introduce errors to the measurements Set Line Frequency to your power grid s frequency to screen out the noise correctly 1 Press the Down arrow until Line Frequency is highlighted and press the Enter arrow Set to 50Hz or 60Hz depending on the electrical power grid of the area that you are in Press the OK key to keep the new setting 34 Clock Settings The 843 R is equipped with a real time clock which will show the date and time This clock will also allow the 843 R to query the sensor attached and notify you if the sensor is due for calibration To set Date and Time 1 Press the Down arrow until the Date and Time are highlighted and press the Enter arrow 2 Scroll through and select Month Day Year Hour and Minutes with the Right arrow gt Change the selected item with the Down arrow 3 When finished press the OK key to keep the new setting 4 3 3 5 Additional On Screen Information On the right hand side of the Setup screen the following information is provided to the user e Instrument o Firmware Version o Serial Number o Date of Last C
12. of the screen e Large numeric display shown prominently in the middle of the screen Bargraph displayed close to the bottom Softkey legends at the bottom of the screen 48 5 3 1 2 Softkey Functionality Range 300uW 918D SL OD3 SIN 11572 Laser 1064 Filter IN E uW 0 300 Power Display Setup Figure 5 1 Bargraph display with first set of Softkeys e Power With Photodiode sensors the only measurement mode available is Power Pressing this key will affect no change e Display Press this key to change the graphical display o Press the Up Down arrow to set the display mode to Bargraph or Needle o Press OK to return to the measurement screen with the new selection o Press Cancel to ignore any changes and continue with the Bargraph display e Setup Press this key to change the Power measurement parameters This will be described in Section 5 3 3 Power Setup Screen e Right Arrow Press this for additional Bargraph screen functions 49 Range 300uW 918D SL OD3 SIN 11572 Laser 1064 Filter IN a uW 45 4 105 4 e Zoom Offset Figure 5 2 Bargraph display with second set of Softkeys and Zoom active e Left Arrow Press this for previous set of Bargraph functions e Zoom Press this key to focus the Bargraph on the present reading The Bargraph will show 20 of the full scale centered on the present reading Thus if the full scale of the Bargrap
13. the appropriate laser wavelength and press the OK key 4 lf the wavelength you want is not among the wavelengths in the six wavelengths listed press the Modify key 5 Use the Right and Down arrows to adjust the wavelength as desired Then press the OK key 2 4 2 To select a range for power measurement 1 From the measurement screen press the Setup key 2 Press the Down arrow until Range is highlighted and press the Enter arrow 3 Select the appropriate manual range AUTO to select autoranging or dBm to display power in a logarithmic scale Press the OK key 2 4 3 Other Settings and Saving the Startup Configuration 1 Select Average in order to set the period over which to average the measurements 10 2 Select Filter to IN or OUT according to if the Filter is in place or not 3 The present settings are automatically saved for the next time the 843 R is turned on 2 4 4 Power Measurement Warning Do not exceed maximum sensor limits for power energy power density and energy density as listed in Table 6 in Chapter 7 Sensor Specifications Otherwise there is a risk of damaging the sensor To simulate an analog needle display on the 843 R 1 Press the Display key and select Needle 2 Press OK to continue with measurements To expand the graph Bargraph or Needle scale 5x about the present reading 1 Press the Zoom key 2 Press the Zoom key again to return to the full scale graph See Section 5 3 1 2 f
14. through an impedance of 100 ohms and provided as a means of integrating the 843 R meter with other instruments such as an oscilloscope 62 6 2 Processor Board The Processor Board is built around a Freescale i MX283 ARM9 application processor The digital circuit includes an upgradeable FLASH chip that can be programmed in situ by the 843 R support software The Processor Board is responsible for reading the keypad and driving the LCD display displaying measurement information received from the Analog Module 6 2 1 Power Supply The power supply provides the internal DC supply voltages for both the Processor Board and the Analog Module It also contains the battery charging circuit and the AC supply for the backlight The power supply circuits consist of high efficiency switch mode designs 6 2 2 EMI Protection The digital processor circuit and the whole 843 R instrument are protected by EMI protection component on all signals that pass in and out of the box In addition EMI protection is added internally to prevent disturbances to the normal functioning of the instrument The instrument meets the requirements of the European Community with respect to electromagnetic compatibility and has the CE mark 63 Chapter 7 843 R Power Meter Specifications 7 1 System Meter Specifications Input Specifications Input Ranges 15nA 1 5mA full scale in 16 ranges Ato D Sampling rate 15Hz Ato D re
15. 50 843 R Power Meter User Manual Newport P N 1J06058 6 May 2013 Rev 1 00 2 For latest version please visit our website http www newport com 67
16. GO Newport Experience Solutions Power Meter Model 843 R 843 R LASER POWER METER USER MANUAL NEWPORT CORPORATION www newport com Table of Contents Chapter 1 Introduction How to Use This Manual 3 Chapter 2 Quick Reference cccecseeseeseees 4 2 1 Getting Started 0 0 ceseessecessecsessessessessesseeseseeeseeeseeaeess 4 2 2 Functions with no Sensor Connected eeee 5 2 3 Thermal SQNSOrSis hniena 7 2 4 Photodiode SENSOMS csseesseeseesesseeesteceeseeseeseeees 10 Chapter 3 The 843 R Power Meter Unit 12 3 1 General Description cessesesessesseereeseenteeneennees 12 3 2 Smart COMME ctOS sanninna 13 3 3 SOft Keysin renha i welded elles 14 3 4 Power Up and Shut DOWN cccscsesseeseessssteeesseeees 15 3 5 843 R Functions that are Independent of Sensor Type West hitecereuawshdiweta aide a a ai 16 3 6 843 R Measurement Screens 19 3 7 Hardware Functions sses 21 Chapter 4 0peration with Thermopile Absorber SONSONS iiaa aai a vee nie 24 4 1 Thermopile Absorber SensoFs s ssssssseesessesseeees 24 4 2 Startup Configuration cccccssesesseseeeeeeees 25 4 3 Power Measurement 25 4 4 Energy Measurement ssssssssssssrssssrreerrreesseee 35 Chapter 5 Operation with Photodiode Sensors 47 5 1 Photodiode Sensors sses 47 5 2 Startup Configuration ccccccsscssecesseeeseeseeees 47 5 3 Power Measurement cccccccccscsescscseseseeeeeeee
17. J 919P 020 12 SiN 660052 Laser 971 Threshold MEDIUM READY Zoom Offset Figure 4 7 Bargraph display with second set of Softkeys e Left Arrow Press this for previous set of Bargraph functions e Zoom Press this key to focus the Bargraph on the present reading The Bargraph will show 20 of the full scale centered on the present reading Thus if the full scale of the Bargraph is 30 Joules and your reading is 15 Joules pressing Zoom will make the Bargraph scale range between approximately 12 and 18 Joules Small fluctuations in energy are more easily seen in this mode fan will be reverse highlighted to show that it is active Press the Zoom key again to return to the unexpanded Bargraph display e Offset Unlike power offset subtraction is not necessary to achieve accurate energy measurements However it can be used to facilitate 39 comparison between readings For example the first laser pulse is 1 Joule To subtract this from future readings press the Offset key If the next pulse is actually 3 Joules 2 Joules will be displayed on the screen thereby indicating the difference between the two laser pulses When active the key is reverse highlighted and the offset that is being subtracted is shown in the upper right part of the screen To deactivate press Offset again 4 4 3 Needle Screen 4 4 3 1 Screen Layout A Needle graph simulates an analog display similar to the style of an analog voltme
18. alibration e Sensor o Name o Serial Number o Date of Last Calibration if supported by the sensor 4 4 Energy Measurement 4 4 1 Measuring Energy with Thermopile Sensors Although thermopile sensors are used primarily to measure power they can measure single shot energy as well where they integrate the power flowing through the disc over time and thus measure energy Since the typical time it takes for the disc to heat up and cool down is 35 several seconds these thermal sensors can only measure one pulse every several seconds at most Thus they are suitable for what is called single shot measurement Although the response time of the sensor discs is slow there is no limit to how short the pulses measured are since the measurement is of the heat flowing through the disc after the pulse 4 4 1 1 Standard Case of Energy Measurement To measure energy of a single pulse first set up the Energy Range Laser and Threshold as described in Section 4 4 4 Energy Setup Screen 1 Wait until READY is flashed on the screen This indicates that the sensor is ready for a new measurement 2 Fire the laser The display will go blank while the energy is being integrated 3 After about 2 4 seconds depending on the sensor the correct energy will be displayed 4 Return to Step 1 for the next measurement Note If you fire another pulse before READY appears the reading may be inaccurate or may not be displayed 4 4 1 2 Measu
19. ar panel of the 843 R Power Meter see Figure 2 1 12VDC AN OUT SENSOR INPUT USB OTG Figure 2 1 843 R Rear Panel The 843 R Power Meter is equipped with soft keys That is the functions of the keys change as indicated by the legend above each key see Figure 2 2 ph play 919P 020 12 SN 228952 Range 3 00 Laser 2199 Power Meter Model 843 R Figure 2 2 843 R Front View 2 2 Functions with no Sensor Connected 2 2 1 Turning on and off To switch the 843 R Power Meter on Briefly press the on off switch Figure 2 2 The unit will switch on and the display will appear Note With the 843 R Power Meter sensors are hot swappable Even after the meter is switched on you can remove one sensor and insert a different one The 843 R will recognize the switch and reconfigure itself according to the settings of the new sensor To toggle the state of the LCD backlight The backlight for the 843 R s LCD can be toggled between 3 different levels of illumination This toggling will be performed by briefly pressing the on off switch after the 843 R has been switched on To switch the 843 R off Press the on off switch and hold it for about 2 seconds until the display blanks 2 2 2 Configuring the instrument To zero instrument 1 Make sure that the instrument is not in an electrically noisy environment and is undisturbed 2 Verify that no sensor is connected If one is connected then de
20. avelengths In order to compensate for this each sensor has been calibrated by laser at several wavelengths When you choose the correct laser wavelength the correction factor for that wavelength is automatically introduced Note that the laser wavelength correction in use is displayed in the upper left corner of the display To set type of laser being used From the measurement screen press the Setup key Press the Down arrow until Laser is highlighted and press the Enter arrow Select the appropriate laser wavelength and press the OK key To select a range for power measurement From the measurement screen press the Setup key Press the Down arrow until Range is highlighted and press the Enter arrow Select the appropriate manual range or AUTO to select autoranging and press the OK key To choose power or energy measurement 1 In the main measurement screen press the Mode key Select Power or Energy Press the OK key to return to the measurement screen 2 3 2 Other Settings and Saving the Startup Configuration 1 When measuring power you can set the period over which to Average the measurements When measuring energy you can set the threshold level in order to screen out false triggers The present settings are automatically saved for the next time the 843 R is turned on 2 3 3 Power or Single Shot Energy Measurement Warning Do not exceed maximum sensor limits for power energy power density and ene
21. ched and press the OK key 4 lf the wavelength you want is not among the wavelengths in the six wavelengths listed press the Modify key 5 Use the Right gt and Down arrows to adjust the wavelength as desired Then press the OK key 5 3 3 3 Filter When the sensor is equipped with an attenuator filter as is the case for the 818 or 918D series the calibration module contains two sets of calibration data with and without the filter on When the Filter function is turned on the calibration data with the filter in is used 56 Warning If a Newport photodiode sensor is used in the Filter IN setting and the filter is not installed or vice versa the readings will be completely incorrect If the power of your laser exceeds the maximum for filter in you can purchase a thermal or integrating sphere sensor for that wavelength Consult your Newport agent for details To choose the filter setting 1 Press the Down arrow until Filter is highlighted and press the Enter arrow Using the Down arrow toggle between OUT and IN to reach the appropriate Filter setting If you choose wish to work with filter IN be sure to place the removable filter on the detector sensor If you choose wish to work with filter OUT be sure to remove the removable filter from the detector sensor Press the OK key to keep the new setting 57 5 3 3 4 Average How Averaging Works When a laser output is fluctuating or uns
22. ded software should the need arise This is done through the USB OTG port that is found on the rear panel of the instrument To Update the 843 R Firmware 1 Download the latest 843 R firmware upgrade package from the Newport website http www newport com and copy to your target directory 2 Run the upgrade executable and follow the on screen instructions 3 7 5 Sensor Disconnect Connect Recognition With the 843 R sensors are hot swappable Even after the meter is switched on you can remove one sensor and insert a different one The 843 R will recognize the switch and reconfigure itself according to the settings of the new sensor 23 Chapter 4 Operation with Thermopile Absorber Sensors Warning Before using the sensor for power or energy measurement check that your laser power energy and energy density do not exceed the sensor ratings See Tables 5 and 6 in Chapter 7 If the sensor is a water cooled type ensure that the cooling water is flowing at an adequate rate see table below Also note that the reflectance from the absorber could be as much as 10 and with C02 lasers the reflected beam can be quite specular so it is advisable to provide a beam stop for the reflected beam with the highest power lasers Sensor Liters Min US Type per Pressure Gallons Minute At Bar per Full Power Minute Table 1 Minimum Flow Rates for Water Cooled Sensors 4 1 Thermopile Absorber Sensors When a radiant heat so
23. er arrow 2 Using the Down arrow scroll through the available lasers until you reach the appropriate laser wavelength 3 Press the OK key 4 3 3 3 Average How Averaging Works When a laser output is fluctuating or unstable it is useful to measure the average power over a certain period The 843 R gives you this exclusive feature allowing averaging over periods varying from 1 second to 1 hour As soon as the main power measurement screen See Figure 4 2 is entered and the instrument is set to average mode the instrument displays the average of readings over the period since the screen was entered up to the present When the time period of the average is reached the average becomes a running average over the average period backward in time For instance if the average period is 1 minute at 30 seconds the average is over 30 seconds at 1 minute it is over 1 minute at 5 minutes it is over the period from 4 to 5 minutes 1 minute back from the present 33 To Set the Average Period 1 Press the Down arrow until Average is highlighted and press the Enter arrow 2 Using the Down arrow scroll through the list of average periods until you reach the one that is correct for your measurement needs Set the average period to NONE to disable averaging 3 Press the OK key to keep the new setting 4 3 3 4 Other Settings Show or Hide Settings 1 Press the Down arrow until Show Settings
24. everse highlighted and the offset that is being subtracted is shown in the upper right part of the screen To deactivate press Offset again 4 4 4 Energy Setup Screen The 843 R Power Meter can be set to various chosen settings while operating These configuration settings are automatically saved for the next time the meter is turned on with this sensor Range oo porion i Laser 971 ep Threshold MEDIUM a resnorg Calibrated Show Settings Yes spare Line Frequency 50Hz Mari18 2013 14 21 919P 020 12 S N 660052 Set to expected laser power Select autoranging if unknown or laser power varies widely Figure 4 10 Setup Screen 4 4 4 1 Energy Range Energy measurment is always made in a set manual range The correct range to select is the lowest one that is larger than the largest expected measurement To Set the Energy Range 1 Press the Down arrow until Range is highlighted and press the Enter arrow 43 2 Using the Down arrow scroll through the available ranges until you reach the one that is correct for your measurement needs 3 Press the OK key to keep the new setting 4 4 4 2 Laser Most Thermopile sensors have somewhat different absorption at different wavelengths In order to compensate for this each sensor has been calibrated by laser at several wavelengths When you choose the correct laser wavelength the correction factor for that wavelength is automatically introduced N
25. ey to change the Power measurement parameters This will be described in Section 4 3 3 Power Setup Screen e Right Arrow Press this for additional Bargraph screen functions Range AUTO 919P 020 12 S N 660052 Laser 971 a W Zoom Offset Figure 4 2 Bargraph display with second set of Softkeys e Left Arrow Press this for previous set of Bargraph functions e Zoom Press this key to focus the Bargraph on the present reading The Bargraph will show 20 of the 27 full scale centered on the present reading Thus if the full scale of the Bargraph is 20 watts and your reading is 15 watts pressing Zoom will make the Bargraph scale range between approximately 13 and 17 watts Small fluctuations in power are more easily seen in this mode i will be reverse highlighted to show that it is active Press the Zoom key again to return to the unexpanded Bargraph display Offset If the ambient environment has a thermal background so that the 843 R shows a nonzero power reading even when there is no laser you can subtract the background using the Offset function For example the 843 R display reads 0 1 Watts when the laser is blocked and 20 5 Watts with laser power applied In this case the true power is 20 5 0 1 20 4 Watts To subtract the background press the Offset key while the laser is blocked The 843 R will now read zero and the 0 1 Watt background will be subtracted from all subsequent readin
26. f 1 10 100 etc When the reading falls below 9 of full scale of the present range the 843 R will reconfigure itself one range down This change only occurs after a few seconds delay thereby providing overlap hysteresis that limits the 843 R from flipping back and forth when reading close to the end of the scale Manual Range There are certain disadvantages to autorange since it changes scale even if you don t want it to do so If you want to measure in the same range all the time it is better to use manual range The correct range to select is the lowest one that is larger than the largest expected measurement To Set the Power Range 1 Press the Down arrow until Range is highlighted and press the Enter arrow 2 Using the Down arrow scroll through the available ranges until you reach the one that is correct for your measurement needs 3 Press the OK key to keep the new setting 32 4 3 3 2 Laser Most Thermopile sensors have somewhat different absorption at different wavelengths In order to compensate for this each sensor has been calibrated by laser at several wavelengths When you choose the correct laser wavelength the correction factor for that wavelength is automatically introduced Note that the laser wavelength correction in use is displayed in the upper left corner of the display To set type of laser being used 1 Press the Down arrow until Laser is highlighted and press the Ent
27. ght The LCD backlight is actually a set of LED s that illuminate the display from behind Because the 843 R uses a TFT display the backlight must be constantly on It can be operated at full intensity for full illumination or at low or half level to conserve power consummation The backlight level is toggled by a short press on the On Off switch The 843 R backlight consumes considerably less power than competing instruments and therefore it can operate from the battery even when the charger is not plugged in Nevertheless since it does shorten the time between charges it is recommended to set the backlight to less than full intensity when the instrument is operated without the charger 3 7 2 Charging The 843 R can be operated either by the internal battery or from an AC source with the charger plugged in all the time Plug the charger into the jack labeled 12VDC on the back panel see Figure 3 3 The battery will be charged at the same rate whether the 843 R is switched on or off and whatever the backlight level The battery will fully recharge in around 4 5 hours Note The charger circuit of the 843 R is designed to allow the charger to be plugged in for an extended period without causing damage to the battery The approximate time between charges is given in the following table for various configurations Sensor Type Backlight Level Time Between Charges Thermopile and Low 19 hours 21
28. gs The laser power reading displayed will thus be 20 4 Watts When active the key is reverse highlighted and the offset that is being subtracted is shown in the upper right part of the screen To deactivate press Offset again If you suspect that the 843 R has a permanent zero offset the instrument s internal zero should be reset See Section 3 5 5 Needle Display 4 3 2 1 Screen Layout A Needle graph simulates an analog display similar to the style of an analog voltmeter or a car s speedometer By making use of the persistence feature you can know what the full range of measurements actually is including the maximum and minimum readings of the present set of measurements The Needle display is composed of the following components 28 e Parameter settings the sensor s name and serial number and battery status indicator at the top of the screen e Needle displayed prominently in the middle of the screen Large numeric display Softkey legends at the bottom of the screen 4 3 2 2 Softkey Functionality Range AUTO 919P 020 12 SiN 660052 fj Laser 971 1 2 0 3 Mode Display Setup Figure 4 3 Needle display with first set of Softkeys e Mode Press this key to change the selected measurement mode o Press the Up Down arrow to set the measurement mode to Power or Energy o Press OK to return to the measurement screen with the new selection o Press Cancel to ignore any changes and continue in
29. h is 20 mW and your reading is 15 mW pressing Zoom will make the Bargraph scale range between approximately 13 and 17 mW Small fluctuations in power are more easily seen in this mode fu will be reverse highlighted to show that it is active Press the Zoom key again to return to the unexpanded Bargraph display e Offset If the ambient environment has a thermal background so that the 843 R shows a nonzero power reading even when there is no laser you can subtract the background using the Offset function For example the 843 R display reads 0 1 mW when the laser is blocked and 20 5 mW with laser power applied In this case the true power is 20 5 0 1 20 4 mW To subtract the background press the Offset key while the laser is blocked The 843 R will now read zero and the 0 1 mW background will be subtracted from all subsequent readings The laser power reading displayed will thus be 20 4 mW 50 When active the key is reverse highlighted and the offset that is being subtracted is shown in the upper right part of the screen To deactivate press Offset again If you suspect that the 843 R has a permanent zero offset the instrument s internal zero should be reset See Section 3 5 5 5 3 2 Needle Display 5 3 2 1 Screen Layout A Needle graph simulates an analog display similar to the style of an analog voltmeter or a car s speedometer By making use of the persistence feature you can know what the full range of measureme
30. he new setting 3 5 2 Line Frequency 1 Setting Line Frequency correctly removes electrical noise that may be introduced to the measurements 2 Press the Down arrow until Line Frequency is highlighted and press the Enter arrow 3 Set to 50Hz or 60Hz depending on the electrical power grid of the area that you are in 4 Press the OK key to keep the new setting Note The present settings are automatically saved for the next time the 843 R Power Meter is turned on 3 5 3 Analog Output The 843 R Power Meter has an analog output with a full scale output of 1 Volt For thermal and photodiode sensors in power mode the analog output is continually updated 15 times per second with the latest power measurement For thermal sensors in single shot energy mode the analog output is held fixed until the next pulse triggers 3 5 4 Clock Settings The 843 R Power Meter is equipped with a real time clock which will show the date and time This clock will also allow the 843 R Power Meter to query the sensor attached and notify you if the sensor is due for calibration To set Date and Time 1 Press the Down arrow until the Date and Time are highlighted and press the Enter arrow 2 Scroll through and select Month Day Year Hour and Minutes with the Right arrow gt Change the selected item with the Down arrow 3 When finished press the OK key to keep the new setting 3 5 5 Zero Adjustments In
31. he ratio between two measurements will be the difference between the dBm measurements For instance if you want to measure the loss in a fiber optic cable where the measurement before the cable is 1mW 0dBm and the measurement after the cable is 0 1mW 10dBm The ratio is then 1 10 0 1 and the dB loss is 0 10 10dB The dB offset function allows you to easily measure this To do so do as follows 1 When measuring the reference value press dB Offset The value changes to 0 dB note that now the units are dB a relative value instead of dBm an absolute value 2 Now make your second measurement and the value of the difference in dB ratio in numerical units will be shown Note If there is a zero offset in the reference value you cannot subtract this using the dB offset function Instead before the start of the measurement press Offset and subtract the zero offset Then follow steps 1 and 2 above The zero offset subtracted when Offset was pressed will be saved in the dBm scale and you can now use the dB Offset setting to measure true ratio without zero offset problems 60 5 4 2 Measuring Very Low Powers When measuring very low powers such as picowatt measurements using Newport s photodiode sensor there will be a rather large zero offset coming from the detector as well as a considerable noise fluctuation Nevertheless you can measure these low values by using the average function and pressi
32. he soft keys have functions defined by the legend above the key The legend usually indicates what will happen when pressing the key For example if Mode appears above a key pressing that key will open a menu to allow user to select between Power and Energy measurement modes Some functions operate when the key is pressed and are canceled when the key is pressed again Those keys show reverse highlighting when operational Pressing the same key again cancels the operation and the highlighting Key Functions The 843 R has certain conventions as to the meaning of standard key strokes and these are as follows Highlighted item The highlighted item is the item that is presently active OK Returns to the previous screen with the selected setting for immediate use and saved for next startup Cancel Cancels the selection and returns to the previous screen leaving the settings unchanged Start This puts into operation the active item Exit This gets you to the previous screen and saves changes made until instrument is turned off Save This saves changes permanently The change is implemented now and is also saved for future use of the instrument 3 4 Power Up and Shut Down To turn the 843 R on Briefly press the On Off Switch The unit will switch on and the display will appear If no sensor is connected the Setup screen will appear If a sensor is connected the appropriate default measurement screen will appear T
33. ilter Please refer to their user manuals and web sites for the specifications A general guideline is to use the filter when the power level of the source is more than a few mW to avoid sensor saturation When saturated the legend OVER will appear on the screen 5 2 Startup Configuration On power up the 843 R Meter checks its own memory as well as the sensor s to decide on the measurement configuration For example if in the last session the sensor was used to measure power in the Bargraph 47 screen in autoranging with a 1064 laser and averaging for 10 seconds this will be the setup used the next time the system is powered up These settings can all be easily changed as will be described fully in the following sections 5 3 Power Measurement Photodiode sensors measure power continuously at an update rate of 15 times per second To best ensure measurement accuracy center the laser beam carefully on the absorber surface Power measurements can be displayed in Bargraph or Needle graphical formats Updating measurement parameters is performed in the easy to reach Setup screen 5 3 1 Bargraph Display 5 3 1 1 Screen Layout The Bargraph is a ruler like display in which the graph is filled proportionally to the reading s being a percentage of full scale The Bargraph display is composed of the following components e Parameter settings the sensor s name and serial number and battery status indicator at the top
34. l processing for excellent sensitivity signal to noise ratio accuracy and response time It also has special circuitry to reject electromagnetic interference The 843 R has all the infrastructure for field upgrading of the embedded software should the need arise Range Laser 3 00 2199 Power Meter Model 843 R Figure 3 1 843 R displaying power measured with a Thermopile sensor Displayed in analog needle mode with persistence on 3 2 Smart Connectors The 843 R meter is versatile and can operate with either thermal or photodiode type laser measuring sensors The sensor configuration and calibration information is stored in an EEROM in the sensor connector plug This means that when the sensor is plugged in the 843 R automatically identifies the sensor type calibration and configuration The user does not have to adjust anything Note With the 843 R sensors are hot swappable Even after the meter is switched on you can remove one sensor and insert a different one The 843 R will recognize the switch and reconfigure itself according to the settings of the new sensor When no sensor is plugged in the 843 R meter gives the user the opportunity to hide or show settings change the line frequency setting and set the real time clock It also shows the serial number of the instrument last calibration date and firmware version The user can also re zero the instrument See section 3 5 3 3 Soft Keys T
35. ments can be displayed in Bargraph or Needle graphical formats Updating measurement parameters is performed in the easy to reach Setup screen 25 4 3 1 Bargraph Display 4 3 1 1 Screen Layout The Bargraph is a ruler like display in which the graph is filled proportionally to the reading s being a percentage of full scale The Bargraph display is composed of the following components e Parameter settings the sensor s name and serial number and battery status indicator at the top of the screen e Large numeric display shown prominently in the middle of the screen Bargraph displayed close to the bottom Softkey legends at the bottom of the screen 4 3 1 2 Softkey Functionality Range AUTO 919P 020 12 SN 660052 Laser 971 m W Mode Display Setup Figure 4 1 Bargraph display with first set of Softkeys e Mode Press this key to change the selected measurement mode o Press the Up Down arrow to set the measurement mode to Power or Energy o Press OK to return to the measurement screen with the new selection 26 o Press Cancel to ignore any changes and continue in Power measurement mode e Display Press this key to change the graphical display o Press the Up Down arrow to set the display mode to Bargraph or Needle o Press OK to return to the measurement screen with the new selection o Press Cancel to ignore any changes and continue with the Bargraph display e Setup Press this k
36. ng offset to eliminate the detector zero offset In order to measure very low powers do as follows 1 In the Setup screen set the appropriate Average period Return to the measurement screen 2 Now block the power source you wish to measure wait for a few measurement periods and press Offset to subtract the zero offset 3 Now unblock the power source and measure 61 Chapter 6 Circuit Description The 843 R Power Meter has two circuit boards the Analog Module with the analog signal processing circuitry and the Processor Board with the power supplies and user interface components 6 1 Analog Module 6 1 1 Analog Circuit The signal from the detector sensor enters the analog circuit and passes through EMI protection components to a differential trans impedance preamplifier From there it is further amplified by a programmable gain voltage amplifier and passes to an Analog to Digital A D converter All calibration data for the analog circuit is stored in a memory chip on the main board There are no mechanical adjustable components trimmers etc in the 843 R The Analog Module s on board digital processor receives data from the A D converter and translates it into a measurement of current in Amps When used with thermopile sensors the data is then processed by a sophisticated digital filter that speeds up the effective response time of the sensor and rejects noise 6 1 2 Analog Output The analog output is driven
37. nts actually is including the maximum and minimum readings of the present set of measurements The Needle display is composed of the following components e Parameter settings the sensor s name and serial number and battery status indicator at the top of the screen e Needle displayed prominently in the middle of the screen Large numeric display Softkey legends at the bottom of the screen 51 5 3 2 2 Softkey Functionality Range 300uW 918D SL OD3 SIN 11572 Laser 1064 Filter IN 100 200 w ee 64 8 Power Display Setup Figure 5 3 Needle display with first set of Softkeys e Power With Photodiode sensors the only measurement mode available is Power Pressing this key will affect no change e Display Press this key to change the graphical display o Press the Up Down arrow to set the display mode to Bargraph or Needle o Press OK to return to the measurement screen with the new selection o Press Cancel to ignore any changes and continue with the Bargraph display e Setup Press this key to change the Power measurement parameters This will be described in Section 5 3 3 Power Setup Screen e Right Arrow Press this for additional Needle screen functions 52 Range 300uW 918D SL OD3 SIN 11572 Laser 1064 Filter IN 100 200 a y 64B Zoom Offset Figure 5 4 Needle display with second set of Softkeys and Persistence active e Left Arrow
38. o toggle the state of the backlight on and off The backlight for the 843 R s LCD can be configured to toggle between low half and full intensity see Section 3 7 1 for full details This toggling will be performed by briefly pressing the On Off switch after the 843 R has been switched on To switch the 843 R off Press the On Off switch and hold it for about 2 seconds until the display blanks The current measurement settings will be saved automatically for the next time the 843 R is powered up 3 5 843 R Functions that are Independent of Sensor Type Show Settings NO s43 R104 Line Frequency 50Hz S N 91234 Calibrated Mari1812013 10 52 garroso1 gt Setto Yes to show measurement parameters while measuring Set to No to hide them Figure 3 2 843 R Setup Screen with no sensor connected When no sensor is connected the 843 R setup screen will be displayed This gives the user the opportunity to hide or show settings change the line frequency setting and set the real time clock It also shows the firmware version serial number of the instrument and last calibration date The user can also re zero the instrument 3 5 1 Show or Hide Settings 1 Press the Down arrow until Show Settings is highlighted and press the Enter arrow 2 Set to Yes to display sensor settings in the measurement screens Set to No to hide the sensor settings and show a larger graph 3 Press the OK key to keep t
39. or full details To subtract background and set current reading to zero 1 Press the Offset key 2 Press the Offset key again to cancel See Section 5 3 1 2 for full details Chapter 3 The 843 R Power Meter Unit 3 1 General Description The model 843 R laser power energy meter represents a new level of sophistication sensitivity compactness and accuracy coupled with ease of operation It can operate with thermal and photodiode sensors It has smart connector technology Simply plugging in the sensor configures and calibrates the 843 R to operate with that sensor The 843 R s large size TFT 320x240 screen enhances measurement readouts in ways that smaller displays cannot The 843 R displays power measurements in both digital and analog form at the same time and also has a needle type display It can be set to autorange so you do not have to set scales or to a manual range if you wish It will remember what mode you were using before you turned it off and will return to that mode when turned on You can zoom in on the present reading or subtract background The 843 R reads the calibration information that is stored in the sensor s smart connector and is ready to measure from the moment it s powered up You can also zero the 843 R at the touch of a button The 843 R s user interface is self explanatory you should not have to refer to this manual very often Above all the 843 R has advanced circuitry and digital signa
40. ote that the laser wavelength correction in use is displayed in the upper left corner of the display To set type of laser being used 1 Press the Down arrow until Laser is highlighted and press the Enter arrow 2 Using the Down arrow scroll through the available lasers until you reach the appropriate laser wavelength 3 Press the OK key 4 4 4 3 Minimum Energy Threshold If the 843 R is used in a noisy environment or where there is a high level of background thermal radiation the instrument may trigger spuriously on the noise or background radiation It would then fail to measure the intended pulse Since there is always some degree of noise or background radiation the instrument is designed not to respond to pulses below some preset minimum size This Minimum Energy Threshold is typically set to 0 3 of full scale of the selected range If this level is found to be too sensitive for the user s particular environment it may be altered by the user The threshold 44 should not however be raised higher than necessary This will cause a degradation in the accuracy of energy measurements of pulses below about 4 times the threshold level The factory setting of energy threshold is Medium If the unit triggers on noise set the threshold to High If you are measuring small energies and the unit does not trigger set the threshold to Low To Set the Minimum Threshold Level 1 Press the Down arrow
41. rgy density as listed in Error Reference source not found and Table 6 in Chapter 7 Otherwise there is a risk of damaging the absorber To simulate an analog needle display on the 843 R 1 Press the Display key and select Needle 2 Press OK to continue with measurements To expand the graph Bargraph or Needle scale 5x about the present reading 1 Press the Zoom key 2 Press the Zoom key again to return to the full scale graph See Section 4 3 1 2 for full details To subtract background and set current reading to zero 1 Press the Offset key 2 Press the Offset key again to cancel See Section 4 3 1 2 for full details To use the 843 R to measure laser power 1 Press the Mode key and select Power 2 Select AUTO for autoranging or the lowest manual range whose maximum is greater than the expected power readings 3 Power is measured 15 times per second To use the 843 R to measure laser energy 1 Press the Mode key and select Energy 2 Energy measurement is performed in manual ranges only The correct range to select is the lowest one that is larger than the expected pulse energy to be measured 3 Thermal sensors measure energy in single shot mode When the 843 R flashes READY on and off fire the laser 2 4 Photodiode Sensors 2 4 1 Selecting Wavelengths 1 From the measurement screen press the Setup key 2 Press the Down arrow until Laser is highlighted and press the Enter arrow 3 Select
42. ring Pulses of Very Low Energy When it is necessary to measure pulses of very low energy i e less than 0 5 of the maximum range of the instrument the following two alternative methods allow greater accuracy to be obtained 1 A continuous train of pulses may be fired and the average power measured using Power mode The energy per pulse can be calculated by Average Energy per pulse Average power Pulse Repetition Rate 36 2 A train of a known number of pulses may be fired and the total energy measured in Energy mode This train should not exceed 5 seconds duration The energy per pulse can be calculated by Average Energy per pulse Total Energy Number of Pulses In both of the above methods the pulse repetition rate must exceed 3Hz Higher rates will generally give improved accuracy but care should be taken not to exceed maximum power ratings 4 4 1 3 Measuring Energy of Rapidly Repeating Pulses With a typical thermopile sensor the 843 R will only measure individual pulses every 5 seconds or so You can also calculate the average energy of rapidly repeating pulses by measuring average power on the power setting and using the formula Average Energy per Pulse Average Power Pulse Repetition Rate 4 4 2 Bargraph Screen 4 4 2 1 Screen Layout The Bargraph is a ruler like display in which the graph is filled proportionally to the reading s being a percentage of full scale The Bargraph di
43. s 48 5 4 Special Cases of Power Measurement 60 Chapter 6 Circuit Description ccccce 62 6 1 Analog Module eecesecseeecsessesesteseeeeeeeseeeeeeees 62 6 2 Processor Board s nsssannnaawnannaawsne 63 Chapter 7 843 R Power Meter Specifications 64 7 1 System Meter Specifications ccccccsesceseeees 64 7 2 Thermal Sensor Specifications cecseceeeee 64 7 3 Photodiode Sensor Specifications ssesee 65 TAWA tray esti EEN E E 65 7 5 Technical Support Contacts c cccsecseesssseeesseeees 66 Chapter 1 Introduction How to Use This Manual Newport s 843 R Power Meter is a simple to use microprocessor based Laser Power Energy meter that operates with thermopile and photodiode sensors Based on smart connector technology just connecting the sensor configures and calibrates the instrument This manual tells you what you need to know to make full use of the 843 R for all your laser measurement needs It includes a Quick Reference Chapter 2 to allow you to perform basic measurements immediately without reading the whole manual The main measurement sections Chapters 4 and 5 include a general description and a section detailing operating options Chapter 2 Quick Reference 2 1 Getting Started To connect a sensor to the 843 R Power Meter simply insert the 15 pin D type connector of the measuring sensor cable into the socket marked Sensor Input on the re
44. solution 18 bits plus sign Electrical accuracy 0 25 20pA new 0 5 50pA after 1 year Electrical input noise level 500nV or 1 5pA 0 0015 of input range 3Hz Dynamic range 9 decades 1109 General Specifications Detector Compatibility 919P series 918D series 818DB series Analog output 1v full scale 0 03 resolution 100 ohms impedance Analog output accuracy 0 2 of reading 0 3 of full scale volts Dimensions 114W x 41D x 212H Mass 470g Display 320x240 pixel TFT LCD Active area 70x52mm approx Display digit height 15mm LCD lighting LED s Operates from charger or battery Lighting level can be adjusted between 3 levels using on off button Bargraph segments 310 Battery 2x Li lon 3 7V 5 2Amp hour battery pack built in Charger input DC 12 16v 1W Charge time approx 5 hours Automatically stops charging when battery is full Operation between charges With low backlight 19 hours With medium backlight 17 hours With high backlight 15 hours 7 2 Thermal Sensor Specifications Max Absorber Power Type WATTS 919P 010 16 28KW cm eB 1 Max Avg Power Density at Max Power 919P 050 26 S0 150 W _ i2kwem JBB 12KW cm eB 919P 150 26_ sow t2KWiem BB 919P 250 35_ aow t0KWem BB 919P 500 65 sow wem BB Table 5 Max Power Specifications of Sensors BB BB BB BB BB BB BB BB BB B
45. splay is composed of the following components e Parameter settings the sensor s name and serial number and battery status indicator at the top of the screen e GW will be flashed on the screen to indicate that the 843 R is ready to measure the next laser pulse to be fired 37 e Large numeric display shown prominently in the middle of the screen Bargraph displayed close to the bottom Softkey legends at the bottom of the screen 4 4 2 2 Softkey Functionality Range 1 00J 919P 020 12 SN 660052 Laser 971 Threshold MEDIUM READY Mode Display Setup Figure 4 6 Bargraph display with first set of Softkeys e Mode Press this key to change the selected measurement mode o Press the Up Down arrow to set the measurement mode to power or energy o Press OK to return to the measurement screen with the new selection o Press Cancel to ignore any changes and continue in Power measurement mode e Display Press this key to change the graphical display o Press the Up Down arrow to set the display mode to Bargraph or Needle o Press OK to return to the measurement screen with the new selection o Press Cancel to ignore any changes and continue with the Bargraph display 38 e Setup Press this key to change the Energy measurement parameters This will be described in Section 4 4 4 Energy Setup Screen e Right Arrow gt Press this for additional Bargraph screen functions Range 1 00
46. splay reads 0 1 Watts when the laser is blocked and 20 5 Watts with laser power applied In this case the true power is 20 5 0 1 20 4 Watts To subtract the background press the Offset key while the laser is blocked The 843 R will now read zero and the 0 1 Watt background will be subtracted from all subsequent readings The laser power reading displayed will thus be 20 4 Watts When active the key is reverse highlighted and the offset that is being subtracted is shown in the upper right part of the screen To deactivate press Offset again If you suspect that the 843 R has a permanent zero offset the instrument s internal zero should be reset See Section 3 5 5 4 3 3 Power Setup Screen The 843 R Power Meter can be set to various chosen settings while operating These configuration settings are automatically saved for the next time the meter is turned on with this sensor AUTO gorios T Laser 971 S N 91234 Average NONE Calibrated Show Settings Yes OAOT Line Frequency 50Hz Mari18 2013 13 51 919P 020 12 S N 660052 Setto expected laser power Select autoranging if unknown or laser power varies widely Figure 4 5 Setup Screen 31 4 3 3 1 Power Range Autorange In autorange mode you do not have to change scales When the reading of the meter is more than 100 of full scale of the present range the 843 R will reconfigure itself to the next higher range The ranges are arranged in factors o
47. table it is useful to measure the average power over a certain period The 843 R gives you this exclusive feature allowing averaging over periods varying from 1 second to 1 hour As soon as the main power measurement screen See Figure 5 1 is entered and the instrument is set to average mode the instrument displays the average of readings over the period since the screen was entered up to the present When the time period of the average is reached the average becomes a running average over the average period backward in time For instance if the average period is 1 minute at 30 seconds the average is over 30 seconds at 1 minute it is over 1 minute at 5 minutes it is over the period from 4 to 5 minutes 1 minute back from the present To Set the Average Period 1 Press the Down arrow until Average is highlighted and press the Enter arrow 2 Using the Down arrow scroll through the list of average periods until you reach the one that is correct for your measurement needs Set the average period to NONE to disable averaging 3 Press the OK key to keep the new setting 5 3 3 5 Other Settings Show or Hide Settings 1 Press the Down arrow until Show Settings is highlighted and press the Enter arrow 1 2 Set to Yes to display sensor settings in the measurement screens Set to No to hide the sensor settings and show a larger graph 3 Press the OK key to keep the new setting 58 Line Frequency
48. tach before continuing 3 Press the Zero key This will bring you to the Zeroing screen 4 Press the Start key When zeroing finishes press the Save key To show or hide settings 1 Press the Down arrow until Show Settings is highlighted and press the Enter arrow 2 Set to Yes to display sensor settings in the measurement screens Set to No to hide the sensor settings and show a larger graph 6 To set Line Frequency 1 Setting Line Frequency correctly removes electrical noise that may be introduced to the measurements 2 Press the Down arrow until Line Frequency is highlighted and press the Enter arrow 3 Set to 50Hz or 60Hz depending on the electrical power grid of the area that you are in To set Date and Time 1 Press the Down arrow until the Date and Time are highlighted and press the Enter arrow 2 Scroll through and select Month Day Year Hour and Minutes with the Right arrow Change the selected item with the Down arrow Note The present settings are automatically saved for the next time the 843 R is turned on 2 2 3 Updating the 843 R Firmware 1 Download the latest 843 R firmware upgrade package from the Newport website http www newport com and copy to your target directory 2 Run the upgrade executable and follow the on screen instructions 2 3 Thermal Sensors 2 3 1 Use of the 843 R with thermal type sensors Most Thermopile sensors have somewhat different absorption at different w
49. ted 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 negligence 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 7 5 Technical Support Contacts North America Newport Corporation Service Dept 1791 Deere Ave Irvine CA 92606 Telephone 949 253 1694 Telephone 800 222 6440 x31694 66 Europe Newport MICRO CONTROLE S A Zone Industrielle 45340 Beaune la Rolande FRANCE Telephone 33 02 38 40 51 56 Asia Newport Opto Electronics Technologies Wuxi Co Ltd ERC BAK K ARAR LHASA KH AMOK J3 8 amp 204028 Lot J3 8 Wuxi Export Processing Zone New District Jiangsu China 204028 Telephone 86 510 8113 2999 Fax 86 510 8526 90
50. ter or a car s speedometer By making use of the persistence feature you can know what the full range of measurements actually is including the maximum and minimum readings of the present set of measurements The Needle display is composed of the following components e Parameter settings the sensor s name and serial number and battery status indicator at the top of the screen e EW will be flashed on the screen to indicate that the 843 R is ready to measure the next laser pulse to be fired e Needle displayed prominently in the middle of the screen e Large numeric display Softkey legends at the bottom of the screen 40 4 4 3 2 Softkey Functionality Range 1 00J 919P 020 12 SN 660052 Laser 971 Threshold MEDIUM READY 0 4 0 6 0 2 0 8 0 712 Mode Display Setup Figure 4 8 Needle display with first set of Softkeys e Mode Press this key to change the selected measurement mode o Press the Up Down arrow to set the measurement mode to power or energy o Press OK to return to the measurement screen with the new selection o Press Cancel to ignore any changes and continue in Power measurement mode e Display Press this key to change the graphical display o Press the Up Down arrow to set the display mode to Bargraph or Needle o Press OK to return to the measurement screen with the new selection o Press Cancel to ignore any changes and continue with the Bargraph display
51. ttings 10 Press the Exit key to return to the Setup screen 18 3 6 843 R Measurement Screens 3 6 1 Bargraph The Bargraph is a ruler like display in which the graph is filled proportionally to the reading s being a percentage of full scale The Bargraph display is available when measuring power or energy Press the Zoom key to zoom in on a smaller section of the range when readings are fluctuating slightly If you notice that noise has gotten into the measurement you can press the Offset key to remove it from the measurement Range AUTO 919P 020 12 SN 660052 Laser 971 Mode Display Setup Figure 3 3 Bargraph with Thermopile Sensor 3 6 2 Needle A Needle graph simulates an analog display similar to the style of an analog voltmeter or a car s speedometer The Needle display is available when measuring power or energy Press the Zoom key to zoom in on a smaller section of the range when readings are fluctuating slightly If you notice that noise has gotten into the measurement you can press the Offset key to remove it from the measurement Press the Persist key to continue to display previous readings as well as to show the minimum and maximum measurements Range 300uW 918D SL OD3 SIN 11572 Laser 1064 Filter IN 100 200 0 _ a 64 8 Zoom Offset Figure 3 4 Analog Needle with Photodiode Sensor with Persistence Enabled 20 3 7 Hardware Functions 3 7 1 LCD Backli
52. until Threshold is highlighted and press the Enter arrow 2 Using the Down arrow scroll through the list of threshold levels until you reach the one that is correct for your measurement needs 3 Press the OK key to keep the new setting 4 4 4 4 Other Settings Show or Hide Settings 1 Press the Down arrow until Show Settings is highlighted and press the Enter arrow 2 Set to Yes to display sensor settings in the measurement screens Set to No to hide the sensor settings and show a larger graph 3 Press the OK key to keep the new setting Line Frequency The 843 R has built in circuitry to screen out electrical noise from the local power grid that can introduce errors to the measurements Set Line Frequency to your power grid s frequency to screen out the noise correctly 1 Press the Down arrow until Line Frequency is highlighted and press the Enter arrow 2 Set to 50Hz or 60Hz depending on the electrical power grid of the area that you are in 45 3 Press the OK key to keep the new setting Clock Settings The 843 R is equipped with a real time clock which will show the date and time This clock will also allow the 843 R to query the sensor attached and notify you if the sensor is due for calibration To set Date and Time 1 Press the Down arrow until the Date and Time are highlighted and press the Enter arrow 2 Scroll through and select Month Day Year Hour
53. urce such as a laser is directed at the absorber sensor aperture a temperature gradient is created across the thermopile of the enclosed detector disc This generates a voltage proportional to the incident power 24 The meter s electronics amplifies this signal and indicates the power level received by the sensor At the same time signal processing software causes the meter to respond faster than the actual thermal rise time of the detector disc thereby reducing the response time of the 843 R Energy of a single pulse is measured on the 843 R by digitally integrating the pulse power over time 4 1 1 Supported Models The 843 R Power Meter is compatible with our new line of 919P Thermal Sensors Older models of thermal sensors are not compatible 4 2 Startup Configuration On power up the 843 R meter checks its own memory as well as the sensor s to decide on the measurement configuration For example if in the last session the sensor was used to measure power in the Bargraph screen in autoranging with a YAG laser and averaging for 10 seconds this will be the setup used the next time the system is powered up These settings can all be easily changed as will be described fully in the following sections 4 3 Power Measurement Thermopile sensors measure power continuously at an update rate of 15 times per second To best ensure measurement accuracy center the laser beam carefully on the absorber surface Power measure
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