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ILX Lightwave OMM-6810B User Manual

Optical power and wavelength meter
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User's Guide
Optical Power and Wavelength Meter
OMM-6810B
ILX Lightwave Corporation
·
31950 Frontage Road
·
Bozeman, MT, U.S.A. 59715
·
U.S. & Canada:
1-800-459-9459 ·
International
Inquiries: 406-556-2481
·
Fax 406-586-9405
·
ilx.custhelp.com
www.ilxlightwave.com
70034103 January 2010

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  • Page 1 User’s Guide Optical Power and Wavelength Meter OMM-6810B ILX Lightwave Corporation · 31950 Frontage Road · Bozeman, MT, U.S.A. 59715 · U.S. & Canada: 1-800-459-9459 · International Inquiries: 406-556-2481 · Fax 406-586-9405 · ilx.custhelp.com www.ilxlightwave.com 70034103 January 2010...

  • Page 3: Table Of Contents

    Buttons/Indicators ..........10  01_10 OMM-6810B...
  • Page 4 <nrf value> ..........25  OMM-6810B...
  • Page 5 Getting Started with GPIB ......... 30 Overview of the OMM-6810B Syntax ......30 Using Commands with Parameters .
  • Page 6 Common Commands ..........51 OMM-6810B Device-Dependent Commands ......51 Command Paths .

  • Page 7: Safety Information And The Manual

    • Prolonged storage under adverse conditions • Failure to perform intended measurements or functions If necessary, return the instrument to ILX Lightwave, or authorized local ILX Lightwave distributor, for service or repair to ensure that safety features are maintained (see the contact information on page ix).

  • Page 8: Safety Marking Symbols

    Terminal Terminal On: In position of a bistable push control. Off: Out position of a bistable push control. The slash (I) only denotes that mains are on. The circle (O) only denotes that mains are off.  OMM-6810B...
  • Page 9 Returning an Instrument If an instrument is to be shipped to ILX Lightwave for repair or service, be sure to: Obtain a Return Authorization number (RA) from ILX Customer Service.
  • Page 10 If the instrument is damaged, file a claim with the carrier. The factory will supply you with a quotation for estimated costs of repair. You must negotiate and settle with the carrier for the amount of damage. viii  OMM-6810B...

  • Page 11: Comments, Suggestions, And Problems

    WA R R A N T Y Comments, Suggestions, and Problems To ensure that you get the most out of your ILX Lightwave product, we ask that you direct any product operation or service related questions or comments to ILX Lightwave Customer Support.
  • Page 12 WA R R A N T Y in a container with at least 3 inches (7.5 cm) of compressible packaging material on all sides. We look forward to serving you even better in the future!  OMM-6810B...

  • Page 13: Introduction And Specifications

    NTRODUCTION AND PECIFICATIONS  This manual contains operation and maintenance information for the OMM-6810B Optical Power and Wavelength Meter. If you want to get started immediately, read Appendix B, Quick Start, first. Chapter 2 contains a detailed reference for control of the 6810B front panel.
  • Page 14 "hazard zone" may be computed for a particular laser and exposure time. For more information concerning laser and laser diode safety, contact the Center for Devices and Radiological Health or ILX Lightwave. Refer Servicing to only to qualified, authorized personnel.

  • Page 15: Available Options And Accessories

    SC Adapter (6780B, 6790B, 6795B) CA-150 LC Adapter (6780B, 6790B, 6795B) CA-20001 Bare Firber Adapter Ring (6780B, 6790B, 6795B) CA-120 Bare Fiber Adapter Ring AO120 (6703B, 6780B, 6722B, 6727B, 6709B, 6745B) Dual Rack Mounting Kit RM-123 Single Rack Mounting Kit RM-125 01_10 OMM-6810B ...

  • Page 16: Specifications

    C H A P T E R Specifications Specifications Electrical performance and general specifications for the OMM-6810B are listed below. The electro-optic performance specs can be found in the instruction manual for each optical measurement head. All electrical parameters are...
  • Page 17 < 2.5 kg (5.5 lbs) Warm-up 1 hour 1. Antistatic covers are included on all connectors. These covers should remain in place when the instrument is not in use to prevent a static discharge from damaging the instrument. 01_10 OMM-6810B ...
  • Page 18 Our goal is to make the best laser diode instrumentation available anywhere. To achieve this, we need your ideas and comments on ways we can improve out products. We invite you to contact us at any time with your suggestions.  OMM-6810B...

  • Page 19: Installation And Operation

    Failure to observe this precaution can result in severe injury or death. Tilt-Foot Adjustment The instrument has front legs that extend to make it easier to view the display. Place the OMM-6810B on a stable base and rotate the feet downward until they lock into position. OMM-6810B ...

  • Page 20: Rack Mounting

    Power-Up Sequence Rack Mounting The OMM-6810B may be rack mounted by installing a rack mount flange on each side of the enclosure. Detailed installation instructions are included with the rack mount kit. Refer to Chapter 1 for applicable rack mount accessory part numbers.

  • Page 21: Front Panel Controls

    Front Panel Controls Front Panel Controls The OMM-6810B is intuitively operated from the front panel keypad, indicator LEDs and dual displays. The front panel will change form slightly depending upon the measurement head attached to the instrument. A drawing of the front panel is shown in Figure 2.1.

  • Page 22: Right Display

    Buttons/Indicators Each of the front panel functions is now described in detail. The OMM-6810B forms a basis for different optical measurements depending on which Optical Measurement Head is attached. Functions may change form slightly or be disabled depending upon which measurement head is attached to the instrument.

  • Page 23: Remote Control

    Front Panel Controls Remote Control When the OMM-6810B is addressed by a host computer the LED indicator above the LOCAL button is illuminated and the front panel is disabled from manual control. Press LOCAL to return to LOCAL (front panel) control.

  • Page 24: Power Up / Down Arrow Buttons

    • Commonly used wavelengths may be stored or retrieved by using the WAVELENGTH      BLUE SHIFT, STORE 3, and 4 buttons as described in this chapter.  OMM-6810B...

  • Page 25: Wavelength Store L Control

    6810B every time it is used. Use the procedure below to save up to four wavelengths. • Program the desired wavelength into the OMM-6810B using the procedure described in section 2.4.5.8. • Press the WAVELENGTH BLUE SHIFT button. The LED above the SHIFT button will be illuminated.

  • Page 26: Wavelength Left/Right/Up/Down Arrow Switches

    • Setting the wavelength in the User Calibration. • Storing or retrieving up to four selectable wavelengths. User Calibration It is possible to calibrate the OMM-6810B with any Optical Measurement Head using a laser source of known wavelength and/or power. Pressing the CAL USER button toggles the instrument in and out of the User Calibration mode.

  • Page 27: Zeroing

    The DISPLAY LOG/LIN button toggles the optical power display between linear units (pW, nW, W, mW, W) or logarithmic units (dBm). If the instrument is in power autoranging mode the power display autoranges the linear power units and decimal point. 01_10 OMM-6810B ...

  • Page 28: Wavelength Display Units

    ( and cm indicators are Δ illuminated). Pressing the DISPLAY button again returns the wavelength display to absolute measurements. A negative change in wavelength indicates a shorter wavelength with respect to the reference.  OMM-6810B...

  • Page 29: View Reference

    The measurement rate for the SLOW rate is 60ms/Sample and the input bandwidth is 1 Hz. A sliding average is taken with sixteen samples. The display is updated every 60ms and the rate indicator flashes at a frequency of 0.5 Hz. 01_10 OMM-6810B ...

  • Page 30: Hold Indicator

    Errors are displayed for three seconds or until the error causing condition is remedied, whichever is longer. See Appendix A for a detailed list of error messages.  OMM-6810B...

  • Page 31: Rear Panel Connections

    Rear Panel Connections Refer to Figure 2.2 for the following discussions of rear panel connections. Figure 2.2 OMM-6810B Rear Panel AC Power Entry Module The AC Power Entry Module is located on the right side of the 6810B rear panel.

  • Page 32: General Operating Procedures

    Storage temperatures should be between -40 to +70 C. To achieve rated stability, let the OMM-6810B warm up for at least 1 hour before use. Other Considerations The OMM-6810B is designed to provide the user with a simple operating format.
  • Page 33 When the 6810B is connected to a host computer, the instrument can be controlled remotely via an IEEE488 GPIB bus. The OMM-6810B with the optional model 1268 complies with the IEEE 488.2/1987 standard to the extent shown in Table 3-1.

  • Page 34: Gpib/Ieee 488.2 Remote Operation

    IEEE488.1 specification. GPIB Address The talk and listen addresses on the OMM-6810B are identical. When the unit is in LOCAL mode, pressing the LOCAL button causes the GPIB address to be displayed. Extended GPIB addressing is not implemented in the 6810B. Use the following procedure to change the GPIB address.
  • Page 35 G P I B / I E E E 4 8 8 . 2 R E M O T E O P E R A T I O N C H A P T E R Preparation for GPIB Control In three seconds, the new address is stored and the display returns to standard measurements. 01_10 OMM-6810B ...

  • Page 36: Ansi/Ieee-488.2 Definitions

    In most practical programming situations, the space character (space bar) would be used as white space. White space is generally used to separate syntactic elements and is processed without interpretation.  OMM-6810B...

  • Page 37: Nrf Value

    If the suffix is not used, the default suffix is assumed. The device interprets any alpha characters following decimal data as a suffix without regard to upper/lower case. Table 3.2 illustrates the suffixes used by the 6810B, including default suffix values. Table 3.2 Suffixes Used by the OMM-6810B Suffix Definition Nanometers...

  • Page 38: Program Message Terminator

    <PROGRAM MESSAGE UNIT SEPARATOR> A <PROGRAM MESSAGE UNIT SEPARATOR> is used to separate sequential <PROGRAM MESSAGE UNIT> elements (commands) from one another within a <PROGRAM MESSAGE>. The syntax for a <PROGRAM MESSAGE UNIT SEPARATOR> is shown in Figure 3.4.  OMM-6810B...

  • Page 39: Program Header Separator

    The syntax for a <compound command program header> is shown in Figure 3.5. The syntax diagram for a <compound query program header> is shown in Figure 3.6. <program <program mnemonic> mnemonic> Figure 3.5 <compound command program header> Syntax Diagram 01_10 OMM-6810B ...

  • Page 40: Program Data> (Parameters)

    <PROGRAM HEADER SEPARATOR> (white space). <ARBITRARY BLOCK PROGRAM DATA> This element allows any 8-bit bytes (including extended ASCII) to be transmitted in a message. The syntax for an <ARBITRARY BLOCK PROGRAM DATA> element is shown in Figure 3.7.  OMM-6810B...

  • Page 41: Program Data Separators

    FF (0-255 decimal). NL is a new line (LF) and ^END is an end or identify (EOI). Figure 3.7 <ARBITRARY BLOCK PROGRAM DATA> Syntax Diagram The only OMM-6810B command that required arbitrary block program data is the *PUD command. <PROGRAM DATA SEPARATORS>...

  • Page 42: Default Parameters

    RIGHT DISPLAY Getting Started with GPIB This secion is intended as a quick guide to the GPIB syntax and commands used by the OMM-6810B. The 6810’s unique (device-dependent) commands are described in Chapter 4. Overview of the OMM-6810B Syntax Generally, a command or query is entered (spelled) as shown in Table 4.1. The command/query must contain all of the letters which are shown in upper case in Figure 4.2 and Table 4.1.

  • Page 43: Using Commands With Parameters

    Substitute Parameter Names For clarity in programming, the (Boolean) values of one and zero may also be represented by the appropriate substitute parameter names, as shown in Table 3.4. 01_10 OMM-6810B ...

  • Page 44: Multiple Parameter Commands

    A query has no space between the mnemonic and the question mark, as in: “WAVE?”. Terminators The 6810B uses a terminator of <NL><^END> (new line, EOI). In almost all cases, these terminators are automatically inserted by the system controller or GPIB driver.  OMM-6810B...

  • Page 45: Common Commands And Queries

    Sending the CLEAR STATUS command resets the Standard Event Register (*ESR?), Status Byte (*STB?) and Error Queue (ERR?) to zero. This command may be used to clear the status registers before enabling SRQ generation from instrument events. 01_10 OMM-6810B ...
  • Page 46 SRQ. <integer <white nrf> space> - where, the <integer nrf> is the binary integer sum of the enabled bits in Figure 3.9. The value must be between 0 and 255.  OMM-6810B...
  • Page 47 This query causes the device to return the value of the STANDARD EVENT REGISTER. The vlue of the response is the binary integer sum of the bits presented in Figure 3.9. Response Binary Integer Sum between 0 and 255. See Figure 3.9. 01_10 OMM-6810B ...
  • Page 48 This query causes the 6810B to return the DEVICE INDENTIFICATION string. The string is 35 bytes long and is in the form described below. Response ILX Lightwave,OMM-6810B,nnnnnnnn,vv where, n - unit serial number and v - firmware revision number *IST? The INDIVIDUAL STATUS QUERY allows the user to read the current state of the IEEE- 488.1 ‘ist’...
  • Page 49 13 - N/A 2 - N/A 6 - Master Status Summary 10 - N/A 14 - N/A 3 - N/A 7 - Error Message Available 11 - N/A 15 - N/A Figure 3.10 Parallel Poll Response Handling Data Structure 01_10 OMM-6810B ...
  • Page 50 (*SRE), Event Status Enable Register (ENAB:EVE), Condition Status Enable Register (ENAB:COND) and the Parallel Poll Enable Register (*PRE) retain their values when power is cycled to the 6810B. 1 - The registers listed above are cleared (set to zero) when the 6810B power is cycled.  OMM-6810B...
  • Page 51 *OPC? query has been executed. These idle states allow the 6810B to complete its reset process before continuing with any other commands after the *RST is executed. Table 3.3 describes the state of the 6810B following the *RST command. 01_10 OMM-6810B ...
  • Page 52 4 - Message Available 1 - Condition Summary 5 - Event Status Summary 2 - N/A 6 - Request Service / Master Status Summary 3 - N/A 7 - Error Message Available Figure 3.11 Service Request Enable Register  OMM-6810B...
  • Page 53 1 - Self test was not completed or encountered errors *WAI The WAIT-TO-CONTINUE command prevents the instrument from executing any further commands until the No-Operation-Pending flag is true. This allows the programmer to make the 6810B wait for the completion of an operation before continuing. 01_10 OMM-6810B ...

  • Page 54: Advanced Programming

    The only exception to the rule described above is when common commands are used. Common Commands may be injected between other commands at the same level. The following command string is legal: "WAVE:MODE CM; *CLS; REF 632.8 NM"  OMM-6810B...

  • Page 55: Error Messages

    6810B. Status Reporting The status of the OMM-6810B is held within four internal registers. Figure 3.12 illustrates the structure of each register. Each is now described. Condition:The Condition Register monitors the state of the device. For example, if the input power is overloading the Measurement Head, bit #0 in the Condition Register is set.

  • Page 56: Device Dependent Event And Condition Registers

    In normal operation, the overlapped commands execute faster than would appear by querying the OPC flag. This is due to the nature of the non-volatile memory storage process. This is done to ensure that the OPC flag is never set  OMM-6810B...

  • Page 57: Input Buffer And Output Data

    Interface Function subsets. This information is generally not required by the user unless there is a question of compatibility of the instrument with a specific controller. A list of 01_10 OMM-6810B ...

  • Page 58: Interface Function Subsets

    Table 3.6 contains GPIB interface messages which are known to be incompatible with the 6810B. Other interface messages which do not appear above may also be incompatible with the 6810B. Table 3.6 Non-Supported Interface Messages for the OMM-6810B  OMM-6810B...
  • Page 59 7 - Power On 7 -Error Message Available 7 6 5 4 3 2 1 0 5 4 3 2 1 0 Standard Event Status Enable Register Service Request Enable Register *ESE *SRE Figure 3.12 OMM-6810B Status Reporting Schematic Diagram 01_10 OMM-6810B ...
  • Page 60 G P I B / I E E E 4 8 8 . 2 R E M O T E O P E R A T I O N C H A P T E R Remote Interface Messages  OMM-6810B...

  • Page 61: Command Reference

     This chapter is a guide to the syntax and usage of the various device-dependent commands for the OMM-6810B. It contains a reference for all of the device- dependent commands, including those which may only be accessed remotely. Therefore, it is of primary interest to users who wish to utilize the GPIB option.

  • Page 62: Commands And Queries

    “POWER:”, as in the following command to set the display units in dBm. “POWER:MODE LOG” Table 4.1 lists all 6810B device-dependent commands, with the full path shown for each command and a brief description. Detailed syntax diagrams and descriptions are provided.  OMM-6810B...

  • Page 63: Common Commands

    Some of the common commands are useful for advanced programming techniques, such as generating service requests (SRQ). OMM-6810B Device-Dependent Commands This section contains descriptions of all device-dependent commands for the 6810B, listed in alphabetical order. Sub-sections for each path are presented, listing all of the commands which are legal for that path.
  • Page 64 C O M M A N D R E F E R E N C E C H A P T E R OMM-6810B Device-Dependent Commands Table 4.1 Device-Dependent Commands NAME PARAMETERS FUNCTION Sets the reference for  P measurements...

  • Page 65: Command Paths

    C H A P T E R Command Paths Command Paths The OMM-6810B device-dependent commands are structured in a tree format as shown in Figure 4.2. Each of the legal paths in Figure 4.2 is followed by the legal commands for that path.
  • Page 66 OFFSET *OPC POWER? OFFSET? OFFSET? *OPC? RANGE *PRE RANGE? REF? REF? *PRE? RATE *PSC RATE? *PSC? SECURE *PUD TERM *PUD? TERM? *RST TIME? *SRE TIMER? *SRE? WAVE *STB? WAVE? *TST? ZERO *WAI ZERO? Figure 4.2 Command Path Structure  OMM-6810B...

  • Page 67: Omm-6810B Device-Command Reference

    Chapter 3. Note: Some GPIB commands are not valid for some optical measurement heads that might be used with the OMM-6810B. The instruction manual for the measurement head contains a list of GPIB commands that are valid for that particular head.
  • Page 68 If the power to the unit is on but the display is dark, press the BRIGHT button once to restore the display. Examples “BRI?” - response: zero, the display is dark “BRIGHT?” - response: five, the display intensity is set to maximum  OMM-6810B...
  • Page 69 The proper test equipment must be in place for this command to work properly. Examples “CAL:POWERSET -3.00 DMB” - action: sets the power in the user calibration to -3 dBm “CAL:POWERSET 1.00” - action: sets the power in the user calibration to 1.00 mW 01_10 OMM-6810B ...
  • Page 70 Refer to Chapter 6 of the optical measurement head instruction manual for details about the user calibration. Examples “CAL:USER START” - action: starts the user calibration “CAL:USER ON” - action: enables the user calibration “CAL:USER OFF” - action: disables the user calibration; factory preset values are utilized  OMM-6810B...
  • Page 71 The proper test equipment must be in place for this command to work properly. “CAL:WAVESET 632.8” - action: sets the in the user calibration to 632.8 nm Examples “CAL:WAVESET 10000 CM” - action: sets the l in the user calibration to 10000 wavenumbers 01_10 OMM-6810B ...
  • Page 72 “COND?” - response: 97, means the power is overranged, the head measures power and wavelength ENABle: RONT ANEL EMOTE The ENABle: command path is used to access the 6810B’s status enable commands. The following commands can be reached by first specifying the ENABle command path. ENABle:COND ENABle:EVEnt ENABle:COND? ENABle:EVEnt?  OMM-6810B...
  • Page 73 The enable registers retain their values at power-up unless the power-on status clear flag is set true (see *PSC in Chapter 3). Example “ENAB:COND 3” - action: allows the power overrange and underrange conditions to be summarized in the status byte 01_10 OMM-6810B ...
  • Page 74 The condition enable register can be set by using the ENABle:COND command. The condition status can be monitored by the COND? command. Example “ENAB:COND?” - response: 144, means an unstable input signal and the hold lambda indicator are allowed to be summarized in the status byte.  OMM-6810B...
  • Page 75 The enable registers retain their values at power-up unless the power-on status clear flag is set true (see *PSC in Chapter 3). Example “ENAB:EVE 16” - action: an unstable input updates bit #0 of the status byte 01_10 OMM-6810B ...
  • Page 76 C O M M A N D R E F E R E N C E C H A P T E R Command Paths ENABle:EVEnt? RONT ANEL EMOTE The ENABle:EVEnt? query returns the value of the OMM-6810B status event enable register. ENAB Parameters None. Response <response data>...
  • Page 77 The response is sent as character data. When the error queue is active (errors exist), bit #7 in the status byte is set to one. Examples “ERR?” - response: 0, means there are no errors to report. “ERRORS?” - response: 707, means the input power is overrange. 01_10 OMM-6810B ...
  • Page 78 C O M M A N D R E F E R E N C E C H A P T E R Command Paths EVEnt? RONT ANEL EMOTE The EVEnt? query returns the value of the OMM-6810B status register. Parameters None. Response <response data> <response terminator>...
  • Page 79 Note This command can be used remotely to identify which optical measurement head is attached to the multimeter. Example “HEAD:IDN?” - response: “ILX Lightwave Corp, OMH-6722”, means the OMH-6722 Silicon Power/Wave Head is attached to the multimeter. 01_10 OMM-6810B ...
  • Page 80 Note This command can be used to determine the state of the wavelength measurement feature in the OMM-6810B. This query is the same as viewing the HOLD indicator on the front panel. Example “HOLD?” - response: 1, means the unit is holding a wavelength but will return to wavelength measurements when the input becomes stable.
  • Page 81 2.3056 W or a linear delta power of 2.30056 W. POWer: RONT ANEL EMOTE The POWer: command path is used to access the OMM-6810B’s power display and power reference functions. The following commands can be reached by first specifying the POWer: command path. POWer:AUTO POWer:MODE...
  • Page 82 Autoranging control can be controlled by issuing the POWer:AUTO command. Examples “POWER:AUTO?” - reponse: 1, means the unit is autoranging the electrical gain range. “POW:AUTO?” - response: 0, means the unit is in manual gain ranging mode.  OMM-6810B...
  • Page 83 “POWER:MODE LOG” - action: the power display is placed into the dBm scale. “POW:MODE DELTA ON” action: the absolute power at the time the command is sent becomes the reference point and the display is forced into either the dB or linear P mode. 01_10 OMM-6810B ...
  • Page 84 “POW:MODE?” - response: “DELTA-NW”, means the front panel is displaying relative power in nanowatts. The GPIB query POWer? returns relative power in watts. “POW:MODE?” - response: “DB”, means the front panel is displaying relative power in logarithmic scale. The GPIB query POWer? returns relative power in dB.  OMM-6810B...
  • Page 85 The CAL:USER ON/OFF command can be used to enable and disable the effects of the user calibration offset. Examples “POWER:OFFSET 2.0” action: future power measurements will be doubled. “POW:OFF 0.9” action: future power measurements will be corrected to 90% of the original power measurement. 01_10 OMM-6810B ...
  • Page 86 Power(corrected) = Power(uncorrected) x cal_factor Examples “POW:OFFSET?” - response: 0.5, the corrected power is one-half of the original measured power. “POWER:OFF?” - response: 2.0, the corrected power is double the original measured power.  OMM-6810B...
  • Page 87 P mode. The power reference point may be queried by sending POWer:REFerence? Examples “POWER:REFERENCE 0 DBM” - action: the reference power is set to 0 dBm. “POW:REF 50 NW” - action: the reference power is set to 50 nW. 01_10 OMM-6810B ...
  • Page 88 “POW:REF?” - response: 5.678E-3, means the power reference is 5.678 mW. PREselect: RONT ANEL EMOTE The PREselect: command path is used to access the four, user programmable, preselect wavelengths in the OMM-6810B. The following commands can be reached by first specifying the PREselect: command path. PREselect:CHANnel PREselect:CHANnel? PREselect:SAVE ...
  • Page 89 The preselect wavelength channels can be programmed via the PREselect:SAVE command. Examples “PRE:CHAN 2” - action: places the wavelength stored in Channel 2 onto the wavelength display. “PRESELECT:CHAN 4” - action: places the wavelength stored in Channel 4 onto the wavelength display. 01_10 OMM-6810B ...
  • Page 90 Examples “PRE:CHANNEL?” - response: 1, means the wavelength stored in preselect channel 1 is present on the wavelength display. “PRESELECT:CHAN?” - response: 0, means that the OMM-6810B is measuring wavelength or the wavelength is not a preselected value.  OMM-6810B...
  • Page 91 RANge? query. Examples “RANGE 3” - action: forces the unit into manual and sets the gain range to #3. “RAN 6” - action: forces the unit into manual and sets the gain range to #6. 01_10 OMM-6810B ...
  • Page 92 “RAN?” - response: 5, means the curreng gain range is #5. RANge: RONT ANEL EMOTE The RANge: command path is used to access the multimeter’s power autoranging commands. The following commands can be reached by first specifying the RANge: command path. RANge:AUTO RANge:AUTO?  OMM-6810B...
  • Page 93 Autoranging can be controlled by issuing the RANge:AUTO command. Examples “RANGE:AUTO?” - response: 1, means the unit is autoranging the electrical gain range. “RAN:AUTO?” - response: 0, means the unit is in manual gain ranging mode. 01_10 OMM-6810B ...
  • Page 94 The measurement rate is set via the RATE command. The measurement rate is determined by observing the frequency of the blinking rate indicator in the upper left corner of the front panel display. Examples “RATE?” - response: SLOW, means the current measurement rate is set to slow.  OMM-6810B...
  • Page 95 Therefore, if number 3 terminator is used, other IEEE-488.2 devices may wait indefinately for a message termination and “hang” the bus. Examples “TERM 5” - action: the <NL> (new line) terminator is selected. The OMM-6810B terminates messages with the <NL> character. 01_10 OMM-6810B ...
  • Page 96 Notes <CR><NL><^END> (0) is the default type. Use of any terminator, other than number 4, removes the OMM-6810B from strict compliance with the IEEE-488.2 standard. Although the <CR> is recognized as a <white space> by the IEEE-488.2 specification, it is used as a possible terminator in order to be compatible with GPIB products which do not meet the IEEE-488.2 standard.
  • Page 97 The TIME clock is independent of the TIMER clock. The clock “turns over” after about 1193 hours. Example “TIME?” - response: 0:01:02.36, means that 1 minute and 2.36 seconds have passed since the OMM-6810B was powered up. 01_10 OMM-6810B ...
  • Page 98 TIME? query. The clock turns over after about 1193 hours. Example “TIMER?” - response: 6:24:50.06, means that 6 hours, 24 minutes, 59.06 seconds have passed since the last TIMER: query was issued.  OMM-6810B...
  • Page 99 “WAVE 632.8” - action: the wavelength is set to 632.8 nm. The HOLD indicator is lit and the WAVELENGTH AUTO indicator is not lit. “WAVE 980 NM” - action: the wavelength is set to 980.0 nm. The HOLD indicator is lit and the WAVELENGTH AUTO indicator is not lit. 01_10 OMM-6810B ...
  • Page 100 WAVE: RONT ANEL EMOTE The WAVE: command path use used to access the OMM-6810B’s wavelength measurement control features. The following commands can be reached by first specifying the WAVE: command path. WAVE:AUTO WAVE:MODE...
  • Page 101 C H A P T E R Command Paths WAVE:AUTO RONT ANEL EMOTE The WAVE:AUTO command enables/disables the wavelength measuring feature of the OMM-6810B. <white <nrf> AUTO WAVE space> Parameters The <nrf value> is a boolean value of 1 or ON to enable wvelength measuremes, 0 or OFF to disable wavelength measurements.
  • Page 102 This command has the same effect as viewing the WAVELENGTH AUTO indicator on the front panel of the multimeter. If the WAVELENGTH AUTO indicator is lit, the OMM-6810B is measuring wavelength. If the unit is not measuring wavelength the WAVELENGTH AUTO indicator is not lit and the HOLD indicator is lit.
  • Page 103 “WAVE:MODE NM” - action: the wavelength display is placed into the nanometers scale “WAVE:MODE DELTA ON” - action: the absolute wavelength at the time the command is sent becomes the reference point and the display is forced into the mode. 01_10 OMM-6810B ...
  • Page 104 “WAVE:MODE?” - response: “NM”, means the front panel is displaying the absolute wavelength in nanometers. The GPIB query WAVE? returns absolute wavelengths in nanometers. “WAVE:MODE?” - response: “DELTA-CM”, means the front panel is displaying relative wavelength in wavenumbers. The GPIB query WAVE? returns relative wavelength in wavenumbers.  OMM-6810B...
  • Page 105 The CAL:USER ON/OFF command can be used to enable and disable the effects of the user calibration offset Examples “WAVE:OFFSET 2.0 CM” - action: two wavenumbers will be added to future wavelength measurements. “WAVE:OFF -5.0” - action: five nanometers will be subtracted from future wavelength measurements. 01_10 OMM-6810B ...
  • Page 106 “WAVE:OFFSET?” - response: 0.5, depending upon the present wavelength display mode, either 0.5 nm or 0.5 wavenumbers is added to the wavelength measurement. “WAVE:OFF?” - response: -2.0, depending upon the present wavelength display mode, either 2.0 nm or 2.0 wavenumbers is subtracted from the wavelength measurement.  OMM-6810B...
  • Page 107 The wavelength reference point may be queried by sending WAVE:REFerence? Examples “WAVE:REFERENCE 15000 CM” - action: the reference wavelength is set to 15000 cm “WAVE:REF 632.8” - action: the reference wavelength is set to 632.8 nm. 01_10 OMM-6810B ...
  • Page 108 This command starts the zeroing process. If the unit has already been zeroed, this command disables the effects of the zero. The status of the zeroing may be obtained via the ZERO? query. Examples “ZERO” - action: initiates the zeroing procedure.  OMM-6810B...
  • Page 109 This query has the same effect as viewing the ZERO indicator on the front panel display. The zeroing procedure is described in Chapter 2. Examples “ZERO?” - response: zero, the zero function is disabled. “ZERO?” - response: two, the unit is currently zeroing. 01_10 OMM-6810B ...

  • Page 110: Error Messages

    488.2 GPIB card. The first is an example of a “driver” for GPIB communications with the OMM-6810B. The second is an example of how to remotely zero the multimeter. These examples are not complete, and therefore cannot be used by themselves.

  • Page 111: Calibration Overview

    This chapter describes how to maintain the OMM-6810B. Calibration Overview It is possible to field calibrate the OMM-6810B with a measurement head attached using a source of known wavelength and/or power. It is recommended that the 6810B be electrically recalibrated every year to maintain accuracy over the entire dynamic range.

  • Page 112: Resetting The Factory Calibration

    Chapter 2 for more details. Line Voltage Selection Line voltage selection requires opening the case and exposure to potentially lethal voltages. These procedures are to be performed by qualified personnel only. Consult the factory for service information.  OMM-6810B...

  • Page 113: Hardware Troubleshooting Guide

    C H A P T E R ROUBLESHOOTING  This chapter is intended to be used as a guide when the OMM-6810B does not perform as expected. It is not a service manual, rather a guide to alleviate basic problems which may arise during operation.
  • Page 114 It may be necessary to perform the User Calibration as described in Chapter 6 of the instruction manual for the measurement head. • The source may be too close to the head and is emitting non-lasing radiation into the aperture.  OMM-6810B...

  • Page 115: Gpib Troubleshooting Guide

    Make sure the controlling software is not requesting information from the 6810B without first sending a query. • Make sure the GPIB controller card in the host computer is configured properly. See Appendix C. • Check GPIB cables and the GPIB address. 01_10 OMM-6810B ...
  • Page 116 T R O U B L E S H O O T I N G C H A P T E R GPIB Troubleshooting Guide  OMM-6810B...
  • Page 117 Area of Operation E-001 to E-099 Internal Program Errors E-100 to E-199 Parser Errors E-200 to E-299 Execution Control Errors E-300 to E-399 GPIB Errors E-400 to E-699 Not Used E-700 to E-999 Hardware Errors Table A.1 Error Code Classifications OMM-6810B ...
  • Page 118 <PROGRAM DATA> will not convert to a signed 16-bit value E-207 <PROGRAM DATA> will not convert to an unsigned 16-bit value E-208 <PROGRAM DATA> will not convert to a signed 32-bit value E-209 <PROGRAM DATA> will not convert to an unsigned 32-bit value  OMM-6810B...
  • Page 119 Error reading calibration data from the optical measurement head E-712 Cannot change update rate while in External Trigger Mode E-713 Measurement head is not compatible with the OMM-6810B E-714 Must be in User Calibration mode before starting a new calibration E-715...

  • Page 120: Error Messages

     OMM-6810B...

  • Page 121: Installation

    The following paragraphs describe front panel operation. Functions change slightly depending on the measurement head attached. WARNING Do not attach or remove Optical Measurement Head while power is applied to the Multimeter. Please turn the power switch off when changing heads. OMM-6810B ...
  • Page 122 WAVELENGTH LEFT, RIGHT, UP and DOWN arrow buttons are used to manually set the wavelength of the source being measured. This feature is disabled with power only measurement heads.  OMM-6810B...
  • Page 123 (nm) and wavenumbers (cm  The DISPLAY P button is used to set a reference power and begin displaying the change in power from that  reference. Pressing the DISPLAY P again returns the display to absolute power measurements. 01_10 OMM-6810B ...
  • Page 124 @ 60m/S/S), MEDIUM (4 samples @ 60mS/S) and FAST (1 sample @ 60 mS/S). It is possible to calibrate the OMM-6810B with any optical measurement head using a laser source of known wavelength and/or power. Pressing the CAL USER button toggles the instrument in and out of the User Calibration mode.

  • Page 125: More Information

    POWER ANALOG OUT connector.. More Information Read Chapter 2 to become familiar with all of the features of the 6810B. GPIB operation is discussed in Chapters 3 and 4. Instruction manuals are also provided with each optical measurement head. 01_10 OMM-6810B ...
  • Page 126 Power and/or Wavelength Measurement  OMM-6810B...

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