Newport 841-PE User Manual
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Newport 841-PE User Manual

Hand-held optical power/energy meter
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Hand-held Optical
Power/Energy Meter
841-PE
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Summary of Contents for Newport 841-PE

  • Page 1 Hand-held Optical Power/Energy Meter 841-PE User’s Manual...

  • Page 2: Warranty

    INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES RESULTING FROM THE PURCHASE OR USE OF ITS PRODUCTS. First printing 2004 © 2004 by Newport Corporation, Irvine, CA. All rights reserved. No part of this manual may be reproduced or copied without the prior written approval of Newport Corporation.

  • Page 3: Declaration Of Conformity

    Declaration of Conformity We declare that the accompanying product, the model 841-PE, identified with the mark, meets the intent of the Electromagnetic Compatability Directive, 89/336/EEC and Low Voltage Directive 73/23/EEC. Manufacturer’s Name: Newport Corporation Manufacturer’s Address: 1791 Deere Avenue Irvine, CA 92606...
  • Page 4 Zone Industrielle 1791 Deere Avenue 45340 Beaune-la-Rolande, France Irvine, CA USA...

  • Page 5: Technical Support Contacts

    Return the product to Newport Corporation, freight prepaid, clearly marked with the RMA# and we will either repair or replace it at our discretion. Newport is not responsible for damage occurring in transit and is not obligated to accept products returned without an RMA#.

  • Page 6: Safety Information

    Safety Information Do not use the 841-PE if the device or the detector looks damaged, or if you suspect that the 841-PE is not operating properly. Appropriate installation must be done for water-cooled and fan-cooled detectors. Refer to the specific instructions for more information. The user must wait for a while before handling these detectors after power is applied.

  • Page 7: Table Of Contents

    Table of Contents Warranty Technical Support Contacts Safety Information List of Illustrations 1 General Information Introduction ...................1 Unpacking..................1 Parts List ..................2 Specifications ................2 Front Panel Description ..............4 1.5.1 I/O and backlight control key..........4 1.5.2 ←, ↑, →, ↓ Arrow keys.............4 1.5.3 ENTER key................4 1.5.4 FUNCTION Key..............4 1.5.5 LCD Screen ...............5...
  • Page 8 2.3.1.6 Status Display ............14 2.3.1.7 View File ..............15 2.3.2 Scale Menu ..............15 2.3.3 Settings Menu ..............16 2.3.3.1 Wavelength Setting..........17 2.3.3.2 Corrections Setting ..........18 2.3.3.3 Data Sampling Settings ...........19 2.3.3.4 Trig Level Setting ............24 2.3.3.5 Period Multiplier............25 2.3.3.6 Refer Values ............25 2.3.3.7 Review Settings ............26 2.3.3.8 Save Contrast............26 2.3.3.9 Communication ............26...
  • Page 9 viii Serial commands .................38 4.2.1 Display Commands............38 4.2.1.1 Set Display...............38 4.2.1.2 Set Scale ..............38 4.2.1.3 Set dBm Display............39 4.2.1.4 Set High Resolution Display ........39 4.2.2 Measurement Commands -- Data Acquisition ....40 4.2.2.1 Query Current Value..........40 4.2.2.2 Query New Value Ready .........40 4.2.2.3 Query Statistics Data ..........40 4.2.2.4 Set Logging Start/Stop..........41 4.2.2.5 File Download ............41...
  • Page 10 5 Error Messages 6 Maintenance USB installation for the 841-PE ..........52 Free Software and Firmware Upgrades ........52 Battery Charging................52 7 Service Information Service Form................55 Appendix A: Attenuator / Diffuser Calibration Procedure Appendix B: Binary Programming (for Advanced Programmers) Binary Mode Rules ..............59...

  • Page 11: List Of Illustrations

    Fig. 1-2 841-PE Top Panel..............5 Fig. 2-1 The menu bar ................8 Fig. 2-2 The dialog box ................8 Fig. 2-3 View of the first group of 841-PE menus.......11 Fig. 2-4 Real time display ..............12 Fig. 2-5 Display options menu .............13 Fig. 2-6 Statistics display ..............14 Fig.

  • Page 12: General Information

    PC interface. The CD included with this meter contains LabVIEW drivers that will transform your PC screen into a virtual 841-PE. While having a copy of LabVIEW installed on your PC is required in order to use this CD, LabVIEW is not needed for programming the instrument in general.

  • Page 13: Parts List

    Parts List The following is a list of parts included with the 841-PE Handheld Power Meter. Please make sure everything is present before discarding packing materials. • • • • 841-PE handheld meter with stand • • • • Battery pack •...

  • Page 14: Fig. 1-1 841-Pe Front Panel

    The 5µV bias can introduce an error into low power measurements when using the 818-series Low Power Detectors. It is essential to use the Zero Offset to rezero the 841-PE before making a measurement in these conditions. It is always good practice to use the Zero Offset. See section 2.2.

  • Page 15: Front Panel Description

    Pressing the I/O key quickly when the 841-PE is OFF turns the 841-PE ON (do not hold the I/O key). To turn off the 841-PE, press and hold the I/O key a few seconds. To prevent battery leakage and to increase battery life, we recommend turning off the 841-PE when not in use.

  • Page 16: Lcd Screen

    1 EXTERNAL POWER SUPPLY INPUT JACK: Input voltage required: 12 VDC/800 mA. 2 SERIAL INTERFACE CONNECTOR (RS 232): This interface allows remote control and data transfers between the 841-PE and a computer, a terminal, a printer or any device that has a serial communication port.
  • Page 17 0.10 V corresponds to 30 milliwatts on the 300 mW range Specifications: Maximum output voltage: Output impedance: 10 kΩ Connector type: Female 1/8” jack 5 PROBE INPUT JACK: The 841-PE uses a DB15 female connector to mate with compatible Newport detector heads.

  • Page 18: System Operation

    This section contains important information concerning the installation and operation of the 841-PE. When delivered, the 841-PE just needs the battery pack installed and it is ready to use. Just insert a detector head in the Probe Input Jack (#5 in Figure 1-2) and press the I/O key.

  • Page 19: Fig. 2-1 The Menu Bar

    Display Scale Settings Ctrl Wavelength Review Settings Corrections None Data Sampling Multiplier#1 (0.1200000) Period Multiplier Offset #1 Trig Level (2%) Multiplier #2 Refer Values Offset #2 Fig. 2-1 The Menu Bar Some menu options require additional information to be activated properly. In this case, a dialog box (see Figure 2-2) appears.

  • Page 20: Making A Measurement

    1- Install the power or energy detector head on its optical stand. 2- First, slide the connector latch to the right to unlock the connector. 3- Turn the 841-PE off and connect a compatible power or energy detector (see Table 1-2 below) to the 841-PE using the PROBE INPUT JACK (see Fig.
  • Page 21 ↵ ↵ ↵ ↵ Enter key. A message appears requesting that you put the cover on your photodiode and then press the ↵ ↵ ↵ ↵ Enter key. The 841-PE passes through all the scales to determine the zero diode for each scale.

  • Page 22: Top Level Menu Structure

    Fig. 2-3 View of the first group of 841-PE menus 2.1.1 Display Menu The various displays offered by the 841-PE allow you to quickly view your measurement in several different ways. You will appreciate the easy-to-view high resolution 58 x 38 mm graphic, the LCD display and the backlight for use in poor ambient light conditions.

  • Page 23: Histogram Display

    @ 1064 nm Fig. 2-4 Real Time Display With an 841-PE, you can also choose either the high resolution mode for the most significant digits available, or the standard resolution to filter out unimportant fluctuations in measurement. This is a setting in the control ( Ctrl ) menu of the 841-PE.

  • Page 24: Line Plot Display

    Scale Settings Ctrl Real Time √ Histogram Line Plot Statistics Tuning Needle Status View File Fig. 2-5 Display Options Menu 2.1.1.3 Line Plot Display The line plot also shows the trends in your data. Actual values are sometimes easier to read than with the Histogram. 2.1.1.4 Statistics Display In Statistics display mode, the statistical analysis screen pops-up on top of the Main display.

  • Page 25: Digital Tuning Needle Display

    Statistics Current Value: 0.9512 W Close Maximum Value: 0.9519 W Start Minimum Value: 0.9505 W Stop Average Value: 0.95118 W Reset Std deviation: 0.9135 mW Cancel RMS Stability: 0.096 % period PTP Stability: 0.147 % Time: 4/10 Sec Fig. 2-6 Statistics Display 2.1.1.5 Digital Tuning Needle Display When you select the Tuning Needle , a graphical interface shows a real-time digital needle.

  • Page 26: View File

    The scale can be set to the automatic scaling mode (Auto mode) or to a specific fixed scale, which depends upon the specific detector head, using the arrow keys on the keypad. Once the Newport detector has been automatically identified from the detector head’s EEPROM (done at boot-up of the 841- PE), the scale menu available for that particular detector is the only one available.

  • Page 27: Settings Menu

    The Scale Menu is used to select the signal level read with a detector head. When a new detector is connected, the autoscale is the default option. In this condition the 841-PE automatically selects the best scale for the value being measured.

  • Page 28: Wavelength Setting

    The checkmark beside the wavelength shows the current selection. To change the wavelength, select an appropriate wavelength from the Wavelength menu. The 841-PE only allows you to choose values that fall within the detector’s range. If you select or enter a value that is not valid, an error message appears and the 841-PE automatically selects the default value.

  • Page 29: Corrections Setting

    Once you have entered the correction factor in the 841-PE (see Corrections Setting below), go to Save Settings under the Settings menu, and save it. This will reload the correction factor every time you reboot the 841-PE with the same type of detector.

  • Page 30: Data Sampling Settings

    The 841-PE can be set to either calculate the statistics for a single sample and stop or to repeat continuously. Take data for a few seconds or a few weeks.
  • Page 31 To Activate the Statistics, select Statistics from the Ctrl menu, and then select Start in the submenu. The 841-PE starts compiling statistics on your measurements as soon as the Statistics mode is activated. Select Stop in the same submenu to turn the...
  • Page 32 Eg. 1 period, 5 hours or 1000 pulses data and/or do statistics. Often the Total Duration and Sample Period will be the same but the 841-PE gives you the flexibility for any application. For example, with the 841-PE you can see 5 minute averages of your laser performance as you check it during the day and have it stop and hold the last 5 minutes worth of statistics after 20 hours.

  • Page 33: Fig. 2-13 Data Sampling Parameters Window

    Fig. 2-13 Data sampling parameters window. Table 2.2 Data Sampling Parameters PARAMETER Choices Description Default Sample Rate Integers Sets the time between each sample. Specify it as a 10 (Power) 0 to 100 number of points per unit of time. (For example, 0 (Energy) for 1 second between samples, set to 60 points per custom...
  • Page 34 To set the Time Stamp , press the down arrow key until “Yes” appears on the screen, then press the Enter key. The “set 841-PE time” dialog box appears. Set Date: To set the date, use the right and left arrow keys to select the date in the format M D Y.

  • Page 35: Trig Level Setting

    Level from the Settings menu and enter the desired number in percent or in decimal form. The 841-PE will not detect pulses with a value under the Trig Level. Be careful to select a scale that is close to the measured value if the Trig Level is high.

  • Page 36: Period Multiplier

    ERRATIC TRIGGERING? For a few detector heads, in electrically noisy environments, it is possible that the 841- PE will inadvertently trigger on the noise. In that case, increase the trigger level to 3% or higher if necessary. It is always good practice to reduce electrical noise generation or shield the detector and meter when measuring very low pulse energies.

  • Page 37: Review Settings

    2.1.3.9 Communication The Communication option allows you to change the baud rate of the serial port, so that the 841-PE can communicate with your computer. You need to know the baud rate of your computer. The possible baud rates are:...

  • Page 38: Control Menu

    OR there was a heat or light source in the field of view of the detector when the 841-PE was turned on (for example, the hand or body of the user). Use this function once your detector has achieved thermal equilibrium to ensure accurate measurements.

  • Page 39: Acquire Data

    The 841-PE records the data in volatile RAM memory. Data in this memory is lost when the 841-PE is turned off. Select Save Data in Flash to save the data in the FLASH memory to keep it after the 841-PE is turned off. You can also select Restore Data from Flash to transfer data from the FLASH back to the RAM memory.

  • Page 40: Statistics Mode

    If you click start again, the 841-PE will resume the statistics from that point compiling the new measurements with the previous. Click Reset and all the statistical parameters will be cleared and set to zero.

  • Page 41: Analog Out

    Use Anticipation to deactivate the power meter acceleration software that provides the “anticipation” response. By using advanced algorithms and known properties of the detector, this software allows the 841-PE to provide a very accurate power measurement a few seconds faster than the natural response of a thermopile power detector.

  • Page 42: Display Hi Res

    2.1.4.11 “?” This menu contains any help and service information available for this version of the 841-PE firmware. That includes “About 841-PE” to identify the firmware version currently loaded in the instrument as well as contact information for Newport service. Future help, FAQ, and detector head...

  • Page 43: Computer Interfacing

    COM port number to set up the serial connection to the 841-PE (see section 3.2.1 below). NOTE: Although the 841-PE is equipped with both a mini-serial port and a USB port, they cannot be used at the same time. Only one port should be connected at a time.

  • Page 44: Setup

    The commands you type will not appear in the HyperTerminal window unless you configure the HyperTerminal to do so. Only the response from the 841-PE will be displayed. If you prefer to see the commands you are typing in the HyperTerminal window, click the File menu and execute the following sequence: File →...

  • Page 45: Hyperterminal Settings Shortcut

    To test the connection, type *VER in the HyperTerminal window and press ↵ ↵ ↵ ↵ ENTER . If the response is the version of your 841-PE, you are successfully connected and ready to send serial commands. 3.1.3 HyperTerminal Settings Shortcut When you end the session, HyperTerminal asks if you want to save your settings.

  • Page 46: Command Reference

    Queries are used to retrieve data, or to obtain information on the current status of the 841-PE. They do not change the settings of the 841-PE, they just return the requested information. When it receives a command, the 841-PE sends an acknowledgement of the command to the host device in the form of a short message describing the change that has been made.
  • Page 47 Example Command Response from 841-PE Turn on backlight *BKL 1 <enter> ACK <CR><LF> Get data value *CVU <enter> Current Value: 0.001616 <CR><LF> Check battery *BAT <enter> The Battery Power is Low <CR><LF> Get Statistics *VSU <enter> Current Value: 0.002013 Maximum: 0.002011 Minimum: 0.000000 Average: 0.000001...

  • Page 48: Command Directory

    4.1.2 Command Directory DISPLAY COMMANDS Text Command Name Command Description Handle Set Display Change on-screen display mode. 1157 Set Scale Manually set scale. 1130 Set dBm Display Toggle dBm unit on & off (Low Power Detectors only) 1159 Set High Resolution Display Toggles additional significant figures to the displayed reading 1161 MEASUREMENT COMMANDS...

  • Page 49: Serial Commands

    Serial commands 4.1.3 Display Commands 4.1.3.1 Set Display This command is used to change the device’s on-screen display mode. Text Command Parameters Return Display Mode Available display modes: Parameter 0 Real-Time Display Default display mode. It shows the current measured value. 1 Histogram Shows a short history of the acquired data.

  • Page 50: Set Dbm Display

    3 microwatts or microjoules 10 microwatts or microjoules 30 microwatts or microjoules 100u 100 microwatts or microjoules 300u 300 microwatts or microjoules 1 milliwatt or millijoule 3 milliwatts or millijoules 10 milliwatts or millijoules 30 milliwatts or millijoules 100m 100 milliwatts or millijoules 300m 300 milliwatts or millijoules 1 Watt or Joule...

  • Page 51: Measurement Commands -- Data Acquisition

    Text Command Return Available/ Not Available <CR> <LF> Example Response from 841-PE Text Command: *NVU <enter> New Data Not Available <CR> <LF> Note that the Query Current Value and Query Statistic Data commands will return the current values from the device even if they have not been updated since the last query.

  • Page 52: Set Logging Start/Stop

    (the terminator is the character string “EOF” followed by a line feed). The current version of the 841-PE can only hold 1 file in memory at a time. Only zero is accepted as a parameter. Look for updates on our website.

  • Page 53: Measurement Commands -- Setup

    RMS stability, standard deviation, average power The following example is for a file 400 bytes long with timestamps, and containing a 20 char text header. Example Response from 841-PE Text Command: *FDL 0 <File 0 data> … <"EOF"> <LF> <enter>...

  • Page 54: Set Offsets

    (1 or 2) and entering a new value in the second parameter. The following example sets multiplier 2 equal to 3.3. Example Response from 841-PE *SMU 2 3.3 <enter> ACK <CR> <LF> 4.1.5.4 Set Offsets This command is used to set the value of the offsets.

  • Page 55: Configure Data Sampling

    4.1.5.6 Configure Data Sampling This command provides the data sampling parameters for the logging and statistics environments. These settings are used when saving data on the device’s data storage media, and also to process statistics. Text Command Parameters Return Sample Rate, Sample Rate Unit, Sample Period, Sample Period Unit, Total Duration, Total Duration Unit, Time Stamp(On/Off)

  • Page 56: Set Trigger Level

    Example Response from 841-PE Text Command: *DSU 4 0 90 1 1 0 1 ACK <CR> <LF> <enter> 4.1.5.7 Set Trigger Level This command sets the internal trigger level when using the device in energy reading mode. Text Command Parameters...

  • Page 57: Set Anticipation

    Return Version number and device type. Example Response from 841-PE Text Command: *VER <enter> 841-PE Version 1.01 <CR> <LF> 4.1.7.2 Query Detector Head Name This command is used to query the model of the current detector head. Text Command Return...

  • Page 58: Configuration Values

    Text Command Return Current static and dynamic configuration values Configuration values: Field name Text Mode Data Head Type Indicates whether the current detector is a wattmeter, a joulemeter or a photodiode. Number identifying the version of Head Version the detector head Head Serial Number Alphanumeric string indicating the serial number for the head.

  • Page 59: Query Battery Power

    This command is used to query the device’s remaining battery power. Text Command Return Low, Medium or High Example Response from 841-PE Text Command: *BAT <enter> The battery power is High 4.1.7.5 Set Internal Clock This command is used to adjust the time and date of the monitor's internal clock.

  • Page 60: Instrument Control Commands

    1 to Enable, 0 to Disable Default: Disabled 4.1.9 Communications Commands 4.1.9.1 Test Communication This command is used to test communication with your 841-PE. The PC is communicating with the meter if you receive the ACK response. Binary Command Return 1000 4.1.9.2 Init Serial Port...
  • Page 61 is different from the current one). You must also change the baud rate of your own serial port. Text Command Parameters Return new baud rate Default: 115200...

  • Page 62: Error Messages

    5 Error Messages Error Comment Command not found Command is invalid. Invalid Parameter The parameter value is out of valid range, or not of expected type (text, numeric, flag). Not Enough Parameters The expected number of parameters should always be sent. Head is not available Verify that the detector’s DB15 connector is fully engaged with the meter.

  • Page 63: Maintenance

    6 Maintenance USB installation for the 841-PE The 841-PE has a mini USB type B port. When connected to a PC it emulates a standard serial port. This means that it is possible to connect many 841-PE meters on one computer, without tying up the ordinary serial ports, while keeping a simple interface for which designing software is easy.
  • Page 64 841-PE to recharge the battery. You can operate the 841-PE by plugging it into a USB port when the battery is low, or even removed, but it will not recharge. Recharging requires the...

  • Page 65: Service Information

    2. Instrument serial number (on rear panel) 3. Description of the problem. If the instrument is to be returned to Newport Corporation, you will be given a Return Number, which you should reference in your shipping documents. Please fill out a copy of the service form, located on the following page, and have the information ready when contacting Newport Corporation.

  • Page 66: Service Form

    Service Form Newport Corporation U.S.A. Office: 800-222-6440 FAX: 949/253-1479 Name _______________________________ Return Authorization #__________________ (Please obtain RA# prior to return of item) Company ________________________________________________________________________ Address ________________________________ ____________________Date _________________ Country _______________________ Phone Number ______________________________________ P.O. Number ___________________ FAX Number _______________________________________ Item(s) Being Returned:...
  • Page 67 Notes:...

  • Page 68: Appendix A: Attenuator / Diffuser Calibration Procedure

    The ratio of these two measurements will be your correction factor. Using the 841-PE Power & Energy Meter, make sure that the Attenuator setting in the Control menu is not checked . That is, it must be off.
  • Page 69 Step 3. The correction multiplier for the 841-PE will be given by: Reading without attenuator (no units) Reading with attenuator Now use this calibration factor for the “Attenuator/Diffuser” when using it at...

  • Page 70: Appendix B: Binary Programming (For Advanced Programmers)

    2 or 4 bytes with the least significant byte sent first. You can program the commands in decimal for sending from the PC. The 841-PE send data in big endian format, that is, the most significant byte comes first.

  • Page 71: Binary Command Reference

    To prevent cross-platform floating-point conversion error all of the numerical values are transferred as integers. That means floating point values must be converted. The 841-PE meter multiplies the value and converts it from float to integer and then transfers it to you. As a result, you must convert and divide it by the same large number to obtain the original floating point value.
  • Page 72 Set Display Binary Command Parameters Return 1157 Display Mode Set Scale Binary Command Parameters Return 1130 Scale identifier or index Send the index of the identifier. Scale Identifiers: Binary Scale Identifier optimum 1 picowatt or picojoule 3 picowatts or picojoules 10 picowatts or picojoules 30 picowatts or picojoules 100 picowatts or picojoules...
  • Page 73 100 watts or joules 300 watts or joules 1 kilowatt or kilojoule 3 kilowatts or kilojoules 10 kilowatts or kilojoules 30 kilowatts or kilojoules 100 kilowatts or kilojoules 300 kilowatts or kilojoules 1 megawatt or megajoule 3 megawatts or megajoules 10 megawatts or megajoules 30 megawatts or megajoules 100 megawatts or megajoules...
  • Page 74 In binary mode, the following structure is sent: Current Value This value should be divided by the Current Value Unit. Current Value Unit This is a divider Maximum This value should be divided by the Maximum Unit. Maximum Unit This is a divider Minimum This value should be divided by the Minimum Unit.
  • Page 75 Unit value. The following example is for a file 400 bytes long with timestamps, and containing a 20 char text header. Example Response from 841-PE Handle = 1172 <20 letters Text Header>, 20, 180, Parameter1 = 0 1, 1(Tag, type 1), 2,1000 (Time stamp, 0.002 second),...
  • Page 76 The following example sets multiplier 2 equal to 3.3. Example Response from 841-PE Handle = 1128 Parameter1 = 2 Parameter2 = 33000 Set Offsets Binary Command Parameters Return 1129 Offset 1 (or 2 ), <Offset value> In binary mode, an extra parameter is required: the scale at witch the value is set.

  • Page 77: Set Trigger Level

    Total Duration, Total Duration Unit, Time Stamp(On/Off) The following example sets a single data acquisition run for 90 minutes with timestamps at 4 Hertz. Example Response from 841-PE Binary Command: Handle = 1152 Parameter1 = 4 Parameter2 = 0 Parameter3 = 90...

  • Page 78: Query Version

    0 to turn Off, 1 to turn On, 2 to undo. Query Version Binary Command Return 1001 Version number and device type. The following example is for a hypothetical 841-PE version 1.2. There are four parameters in binary mode. In this case they would be: Binary parameters Example Header: Acknowledge...

  • Page 79: Query Status

    0 4 83 79 76 79 0 0 0 1 = version 1 0 0 0 2 = extension .2 0 0 0 4 = 4 characters coming 83 79 76 79 = ASCII code for “841-PE” Query Detector Head Name Binary Command Return...
  • Page 80 Head Version same Size indicator. The Serial number string is located at the end of Head Serial Number the binary data. Calibration Sensitivity This is specified in V/W for the Default Wavelength. Divide this value by 100000. ¹ Default Wavelength same This is specified in V/W for the Active Wavelength.

  • Page 81: Set Backlight

    Query Battery Power Binary Command Return 1006 1, 2 or 3 ( one 4 byte double word Example Response from 841-PE Binary Handle = 1006 3 (as one 4 byte word in binary) Command: Set Internal Clock Binary Command Parameters...

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