Newport 843-R User Manual
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Newport 843-R User Manual

Laser power meter
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843-R
843-R
LASER POWER METER
USER MANUAL
NEWPORT CORPORATION
www.newport.com

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  • Page 1 843-R 843-R LASER POWER METER USER MANUAL NEWPORT CORPORATION www.newport.com...

  • Page 2: Table Of Contents

    3.1 General Description ........... 12 3.2 Smart Connectors ............13 3.3 Soft Keys ..............14 3.4 Power Up and Shut Down ......... 15 3.5 843-R Functions that are Independent of Sensor Type ..................16 843-R Measurement Screens ....... 19 Hardware Functions ..........21 Chapter 4.Operation with Thermopile Absorber...
  • Page 3 Special Cases of Power Measurement ....60 Chapter 6.Circuit Description ......62 Analog Module ............62 6.2 Processor Board:............63 Chapter 7.843-R Power Meter Specifications ..64 7.1 System/Meter Specifications ........64 7.2 Thermal Sensor Specifications ........ 64 7.3 Photodiode Sensor Specifications ......65 7.4 Warranty ..............

  • Page 4: Chapter 1.Introduction: How To Use This Manual

    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.

  • Page 5: Chapter 2.Quick Reference

    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 rear panel of the 843-R Power Meter (see Figure 2.1).

  • Page 6: Functions With No Sensor Connected

    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.
  • Page 7 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.

  • Page 8: Thermal Sensors

    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 wavelengths. In order to compensate for this, each sensor has been calibrated by...
  • Page 9 1. When measuring power, you can set the period over which to Average the measurements 2. When measuring energy you can set the threshold level in order to screen out false triggers. 3. The present settings are automatically saved for the next time the 843-R is turned on.
  • Page 10 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.

  • Page 11: Photodiode Sensors

    The correct range to select is the lowest one that is larger than the expected pulse energy to be measured. 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 From the measurement screen, press the Setup key.
  • Page 12 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.

  • Page 13: Chapter 3.The 843-R Power Meter Unit

    843-R has advanced circuitry and digital signal 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.

  • Page 14: Smart Connectors

    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.

  • Page 15: Soft Keys

    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.

  • Page 16: Power Up And Shut Down

    To 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.

  • Page 17: 843-R Functions That Are Independent Of Sensor Type

    3.5 843-R Functions that are Independent of Sensor Type 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.
  • Page 18 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.
  • Page 19 In 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.

  • Page 20: 843-R Measurement Screens

    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.
  • Page 21 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.

  • Page 22: Hardware Functions

    3.7.1. LCD Backlight 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.
  • Page 23 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.
  • Page 24 3.7.4. Field Upgrade The 843-R has all of the necessary infrastructure for field upgrading of the embedded software, should the need arise. This is done through the USB OTG port that is found on the rear panel of the instrument.

  • Page 25: Chapter 4.Operation With Thermopile Absorber Sensors

    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;...

  • Page 26: Startup Configuration

    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.
  • Page 27 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:  Parameter settings, the sensor’s name and serial number, and battery status indicator at the top of the screen.
  • Page 28 Press Cancel to ignore any changes and continue in Power measurement mode.  Display: Press this key to change the graphical display. Press the Up/Down arrow ( ) to set the display mode to Bargraph or Needle. Press OK to return to the measurement screen with the new selection.
  • Page 29 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.
  • Page 30  Parameter settings, the sensor’s name and serial number, and battery status indicator at the top of the screen.  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 Figure 4.3 Needle display with first set of Softkeys ...
  • Page 31 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...
  • Page 32 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.
  • Page 33 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...
  • Page 34 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...
  • Page 35 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.

  • Page 36: Energy Measurement

    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.
  • Page 37 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.
  • Page 38 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. can also calculate the average energy of rapidly...
  • Page 39  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 Figure 4.6 Bargraph display with first set of Softkeys ...
  • Page 40  Setup: Press this key to change the Energy measurement parameters. This will be described in Section 4.4.4 Energy Setup Screen.  Right Arrow ( ): Press this for additional Bargraph screen functions. Figure 4.7 Bargraph display with second set of Softkeys ...
  • Page 41  READY will be flashed on the screen to indicate that the 843-R is ready to measure the next laser pulse to be fired.  Needle displayed prominently in the middle of the screen.
  • Page 42 4.4.3.2 Softkey Functionality Figure 4.8 Needle display with first set of Softkeys  Mode: Press this key to change the selected measurement mode. Press the Up/Down arrow ( ) to set the measurement mode to power or energy. Press OK to return to the measurement screen with the new selection.
  • Page 43  Right Arrow ( ): Press this for additional Needle screen functions. 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.
  • Page 44 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.
  • Page 45 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.
  • Page 46 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.
  • Page 47 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.

  • Page 48: Chapter 5.Operation With Photodiode Sensors

    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.

  • Page 49: Power Measurement

    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.
  • Page 50 5.3.1.2 Softkey Functionality Figure 5.1 Bargraph display with first set of Softkeys  Power: With Photodiode sensors, only measurement mode available is Power. Pressing this key will affect no change.  Display: Press this key to change the graphical display. Press the Up/Down arrow ( ) to set the display mode to Bargraph or Needle.
  • Page 51 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.
  • Page 52 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.
  • Page 53 5.3.2.2 Softkey Functionality Figure 5.3 Needle display with first set of Softkeys  Power: With Photodiode sensors, only measurement mode available is Power. Pressing this key will affect no change.  Display: Press this key to change the graphical display. Press the Up/Down arrow ( ) to set the display mode to Bargraph or Needle.
  • Page 54 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...
  • Page 55 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.
  • Page 56 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...
  • Page 57 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.
  • Page 58 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.
  • Page 59 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 5.1) is entered and the instrument is set to average...
  • Page 60 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.

  • Page 61: Special Cases Of Power Measurement

    Date of Last Calibration  Sensor Name Serial Number 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, the ratio between two measurements will be the difference between the dBm measurements.
  • Page 62 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 pressing offset to eliminate the detector zero offset.

  • Page 63: Chapter 6.Circuit Description

    6.1.2 Analog Output: The analog output is driven through an impedance of 100 ohms and provided as a means of integrating the 843-R meter with other instruments (such as an oscilloscope)

  • Page 64: Processor Board

    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.

  • Page 65: Chapter 7.843-R Power Meter Specifications

    Chapter 7. 843-R Power Meter Specifications 7.1 System/Meter Specifications Input Specifications Input Ranges 15nA - 1.5mA full scale in 16 ranges A to D Sampling rate 15Hz A to D resolution 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.

  • Page 66: 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...

  • Page 67: Technical Support Contacts

    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.
  • Page 68 江苏省无锡市新区出口加工区 J3-8厂房 204028 Lot J3-8, Wuxi Export Processing Zone, New District, Jiangsu China 204028 Telephone: +86-510-8113 2999 Fax: +86-510-8526 9050 843-R Power Meter User Manual Newport P/N 1J06058 6 May 2013 Rev 1.00-2 For latest version please visit our website:...

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