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Newport 835 Manual

Laser pico-watt digital power meter
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Newport 835 Manual

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Summary of Contents for Newport 835

  • Page 1 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...
  • Page 2 Model 835 Laser Pico-Watt Digital Power Meter Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 3 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.

  • Page 4: About This Manual

    Section 1 provides general information about this instrument Section 2 discusses the operation of the Model 835 Section 3 explains performance verification procedures Section 4 discusses the Therory of Operation of the Model 835 Section 5 suggests maintenance procedures Section 6 describes service suggestions and procedures.
  • Page 5 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 6: Table Of Contents

    Preparation for Use ..................5 2.2.1 Line Power....................5 2.2.2 Battery Pack Power ................6 2.2.3 Battery Charging ................6 Tilt Stand ...................... 6 Model 835 Familiarization ................7 2.4.1 Digital Display ..................7 2.4.2 Bar Display ...................8 2.4.3 Front Panel Controls ................8 2.4.4 Input Connector .................
  • Page 7 Special Handling of Static Sensitive Devices ......... 30 Detector/Attenuator Recalibration or Replacement ......30 5.5.1 PROM Replacement Procedure ............31 IEEE-488 (Model 835-IEEE) Interface Installation ........31 Troubleshooting and Self Diagnostic Program ........31 Section 6 - Service Introduction ....................32 Factory Service ...................32 Component Location Drawings ..............33...
  • Page 8 Feedback Picoammeter and Signal Conditioning Circuit...... 18 Wavelength Response of Silicon Detector and Attenuator ....21 Detector Saturation .................. 22 Interconnection of Current Source and Model 835 ....... 25 Simplified Block Diagram ................27 Exploded View of Model 835 ..............33 Mother Board Component Location Drawing ........34 List of Tables Error Messages .....................9...

  • Page 9: Features

    • Ref Mode displays power ratio relative to stored power reference • Choice of individually calibrated Silicon and Germanium detectors • Analog Ouput Options: • Model 835-BAT Rechargeable Battery Pack • Model 835-IEEE IEEE-488 Computer Interface • Model 818-FA Fiber Connector Adaptor with FP3-CA series Snap-In Fiber Connectors viii Artisan Technology Group - Quality Instrumentation ...

  • Page 10: Specifications

    Model 835 Specifications Electrical Accuracy Analog ° ° C-28 C (1 Year) Rise Time ±(%rdg + %full scale) Range Resolution (10%-90%) 0.4 + 0.2 2 nW 0.1 pW 60 msec 0.4 + 0.05 20 nW 1 pW 60 msec 0.2 + 0.05...
  • Page 11 Offsets the zero of the bar segment display to the value displayed on the digital display. Zero Check: Used to adjust zero on lowest range. IEEE-488 Bus Implementation (Option 835–IEEE) Multiline Commands: DCL, SDC, GET, GTL, UNT, UNL, SPE, SPD. Uniline Commands: IFC, REN, EOI, SRQ, ATN.
  • Page 12 −25°C to +60°C. Storage Environment: Power: 105-125V or 210-250V (switch selected), 90- 110V available, 50-60Hz, 12VA. Optional 5 hour battery pack, Model 835-BAT. Dimensions: 216 mm wide x 89 mm high x 267 mm deep (8.5" x 3.5" x 10.5"). Net Weight: 2.1 kg (4.7 lbs.)
  • Page 13 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 14: Section 1 - General Information

    Perform the following steps in sequence to quickly and safely become familiar with the basic operation of the Model 835. 1. Verify that the Model 835 was not damaged in transit, as explained in paragraph 1.3. 2. Carefully read sections on Safety Precautions, General Information, and Operation.
  • Page 15 F. Select logarithm mode (for decibel readings) by pressing the LOG/ LIN button. The dBm annunciator will turn on. Press again to take the Model 835 out of the decibel mode. G. The REF (reference) button stores the reference level to be used to calculate dB (relative) or to make ratio measurements.

  • Page 16: Unpacking And Inspection

    Connect the detector in normal room lights and familiarize yourself with the operation of the instrument following the steps above as a guide. When you are comfortable with the controls of the Model 835, go on and make the desired measurements using Section 2, Operation as a guide.

  • Page 17: Safety Symbols And Terms

    Model 883 Series Attenuators — Replacement attenuators for use with the Model 818-SL, 818-UV, or 818-IR photosensor. Model 835-BAT Rechargeable Battery Pack — Provides a minimum of 5 hours operation from full charge, recharges within 10 hours and is field installable.

  • Page 18: Section 2 - Operation

    This section contains the information needed to prepare and operate the Introduction Model 835 as a power meter. Bench operation consists of using the Model 835 to perform basic optical power measurements. Using the instrument to compensate for dark current and ambient light, as well as making ratio and logarithmic (dBm, dB) measurements, is also covered.

  • Page 19: Battery Pack Power

    Refer to Section 5, paragraph 5.3 for installation procedures. 2.2.3 Battery Charging After the Model 835-BAT Battery pack is installed in the Model 835 it can be charged and recharged as follows: 1. Connect the instrument to line power as described in paragraph 1.2.

  • Page 20: Model 835 Familiarization

    Figure 2-2 Model 835 Front Panel 2.4.1 Digital Display The Model 835 has a 4-1/2 digit backlit liquid crystal display (LCD). The minus sign is displayed. The plus sign is implied by the absence of the minus sign. The following annunciators are displayed on the LCD.

  • Page 21: Bar Display

    TIME CONSTANT (SLOW, MED, or FAST) — Indicates instrument response time constant selected. 2.4.3 Front Panel Controls ON/OFF — Pressing this button turns the Model 835 on. Releasing (out) this pushbutton turns the instrument off. ZERO CHECK and ZERO — This pushbutton and trimpot are used to zero the instrument‘s internal effects.

  • Page 22: Input Connector

    Model 835 locks up. See Section 5 for troubleshooting information cErr Calibration Error Model 835 locks up, but operation can be restored by pressing any one of (NVRAM Failure) the momentary pushbuttons. If restored, calibration is invalid as indicated by flashing “CAL” annunciator. Readings are still approximately correct.

  • Page 23: Environmental Conditions

    Dark noise and detector responsivity change with temperature. See the appropriate detector manual. Basic measurement techniques for using the Model 835 to measure DC Basic Measurements optical power are covered in the following paragraphs. Also included is the operation of the bar graph display, making measurements in decibels (dBm and dB), and using the Null and Reference functions.

  • Page 24: Power-Up

    F60 (F50) indicates that the unit is configured for 60 Hz (50Hz). 2. RAM Test — If this test fails the Model 835 will lock up with F60 or F50 displayed. 3. NVRAM test — This test determines if the instrument analog electronics, not the detector response calibration, are properly read from the NVRAM.

  • Page 25: Setting Wavelength

    Display will read .xxxx nW. To check or adjust zero, proceed as follows: 1. Write down instrument settings to restore after finishing checking the zero. Null, Log, and Ref will automatically be turned off by pressing ZERO CHECK. 2. Press the ZERO CHECK button. 3.

  • Page 26: Setting Attenuator Status

    The transmission characteristic of each attenuator is slightly different, therefore the user must be careful to use ONLY the attenuator and detector pair with the same serial numbers as the particular Model 835 PROM is calibrated for. 2.7.5 Power Measurements 1.

  • Page 27: Ratio Measurements

    For instance, assume that the Null current offset is +1.5 µA and the Model 835 is manually set to the 2 µW full scale range. Also, assume that the detector response is 0.5 amp/watt.

  • Page 28: Logarithmic Modes (Dbm And Db)

    2.7.9 Logarithmic Modes (dBm and dB) The Model 835 can make logarithm measurements referenced to a 1 mW power level or to other power levels with the use of the REF feature. The basic procedure for using the Log mode is to select autorange and press the LOG button (dBm annunciator comes on).
  • Page 29 2. Log measurements using other reference powers (dB): Decibel (dB) measurements, referenced to other optical power levels, can be read directly from the display of the Model 835 by utilizing the Ref feature. To make dB measurements referenced to another power level, proceed as follows: A.

  • Page 30: Bar Display Zoom And Offset

    2.7.10 Bar Display Zoom and Offset The Model 835 includes a 50 segment bar display with zoom and offset controls to provide a qualitative method to observe changes in the signal level. The bar display functions like an analog meter with variable range and zero offset.

  • Page 31: Storing The Wavelength And Attenuator Status For Power-Up

    Two banana jacks, accessible from the rear panel, permit monitoring or recording of the output from the current -to-voltage converter within the Model 835. Since the Model 835 is based on a feedback ammeter, as shown in Figure 2-3, the input current is forced through the feedback resistor and an inverted output voltage is developed by the operational amplifier.

  • Page 32: Ieee Interface Option

    Output Resistance : ±5% 2.7.13 IEEE Interface Option The Model 835-IEEE Interface Option is available for the Model 835. The interface allows computerized data acquisition and control of the Model 835. Detailed operating instructions for the IEEE interface are found in the Model 835-IEEE Interface Instruction Manual supplied with the interface or available from Newport Corporation.

  • Page 33: Temperature Effects

    To check if the variations in ambient light are affecting the measurements, set the Model 835 on MANUAL ranging on the range which will be used for taking actual measurements. Press NULL twice to null dark currents and ambient light.

  • Page 34: Wavelength Response Of Detector And Attenuator

    The detector response as a function of wavelength is stored in a table in the Model 835, and the appropriate value is chosen using the wavelength set by the user. If the spectral source is broader than 10 nm, a choice must be made as to which wavelength will give the best reading.

  • Page 35: Detector Uniformity

    To see if a detector is saturating, reduce the optical power by a known amount, for example, by a factor of 1000 and verify that the reading is as expected. Calibrated attenuators supplied by Newport can be used for this purpose. If the reading is not as expected, apply an attenuator of known attenuation to reduce the optical power.

  • Page 36: Attenuator Characteristics

    2.8.9 Grounding Considerations Input LO (outer ring of the connector) should not be connected to a potential at the source that exceeds 30V RMS from ground. The Model 835 will function properly if the detector is completely floating, i.e. not connected to any ground.

  • Page 37: Introduction

    18°C and 28°C (65° to 82° F) with a relative Conditions humidity less than 70%. Equipment for verifying the performance of the Model 835 is listed in Table Recommended Test 3-1. Alternative equipment may be used as long as the equipment accuracy Equipment is at least as good as the specifications listed in Table 3-1.

  • Page 38: Initial Conditions

    Generally, it takes one hour to stabilize an instrument that is 10°C (18°F) outside of this range. 2. Turn on the Model 835 and allow it to warm up one hour. The instrument may be operated from either line power or battery pack power, as long as the battery pack has been fully charged as described in paragraph 2.2.3.
  • Page 39 1. Set the Model 835 to a wavelength for which the detector response for which the PROM is programmed is accurately known. This information is given in the detector data sheets supplied with the detector. If the response is known for more than one wavelength, choose the wavelength for which the response is a maximum.

  • Page 40: Section 4 - Theory Of Operation

    DC current ranges and a photodetector. A Functional simplified block diagram of the Model 835 is shown in Figure 4-1. The heart Description of the Model 835 is a current to voltage converter followed by an A/D converter that translates the conditioned analog input signals into a form useable by the microcomputer.

  • Page 41: Input Amplifier

    (PROM). In addition, the microcomputer performs the mathematical operations neccessary to implement the features of the Model 835 such as Null, Reference (ratio), and Log (dBm, dB), and to drive the analog bar display. The microcomputer centers around the 146805E2 CMOS microprocessor. It is an 8 bit processor.

  • Page 42: Section 5 - Maintenance

    The top cover of the Model 835 must be removed in order to move the Top Cover calibration jumper, service the unit, change the line frequency, change the PROM, or to install the Model 835-BAT battery pack and/or the Model 835- IEEE computer interface.

  • Page 43: Special Handling Of Static Sensitive Devices

    5. Carefully place the shield (with battery pack) back into the Model 835 and replace the four screws securing it. 6. Connect the ribbon cable from the battery board to the male connector (marked BAT) on the mother board. Take care to ensure that the plug is centered on the pins, and that it is not shifted to one side.

  • Page 44: Prom Replacement Procedure

    6. Replace the top cover as described in paragraph 5.2 The Model 835 should now be ready for functional use with the new PROM. Plug in the instrument, and press until the serial number is displayed as described in paragraph 2.7.3, Note 3.

  • Page 45: Section 6 - Service

    Section 6 Service This section contains information about servicing the Model 835 and Introduction accessories, and component location drawings. The Model 835 is designed to be serviced by replacing PC boards. This method eliminates the need for the user to return the entire unit to the factory for repair. In some instances, however, field repair may be more appropriate.

  • Page 46: Component Location Drawings

    Component Location Drawings Figure 6-1. Exploded View of Model 835 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 47 Figure 6-2. Mother Board, Component Layout Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 48: Service Form

    Service Form Newport Corporation U.S.A. Office: 714/863-3144 FAX: 714/253-1800 Name RETURN AUTHORIZATION # _____________________________________________________________________________________ ____________________________ Company (Please obtain prior to return of item) _______________________________________________________________________________ Address _________________________________________________________________________________ Country Date _________________________________________________________________________________ _______________________________________________________________ P.O. Number Phone Number __________________________________________________________________________ ________________________________________________ Item(s) Being Returned: Model #...
  • Page 49 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 50 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 51 Newport Corporation, Irvine, California, has been certified compliant with ISO 9002 by the British Standards Institution. Certificate No.: FM 27207 Belgium Corporate Headquarters Germany Klinger Systems Center Switzerland Telephone: 016-402927 Newport Corporation Telephone: 06151-1540 Telephone: 516-745-6800 Telephone: 01-740-2283 Facsimile: 016-402227 P.O.
  • Page 52 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...

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