Newport 1825-C Operator's Manual

Newport 1825-C Operator's Manual

Power/energy meter
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Model 1825-C
Power/Energy Meter


Table of Contents

Summary of Contents for Newport 1825-C

  • Page 1 Model 1825-C Power/Energy Meter ’ PERATOR ANUAL...
  • Page 2 Model 1825 - C Power/Energy Meter...
  • Page 3: Warranty

    Warranty Newport Corporation warrants this product to be free from defects in material and workmanship for a period of 1 year from the date of shipment. If found to be defective during the warranty period, the product will either be repaired or replaced at Newport’s option.
  • Page 4: Ec Declaration Of Conformity

    EC DECLARATION OF CONFORMITY Model 1825-C Active Isolation Module Set Series We declare that the accompanying product, identified with the " " mark, meets the intent of the Electromagnetic Compatability Directive, 89/336/EEC and Low Voltage Directive 73/23/EEC. Compliance was demonstrated to the following specifications:...
  • Page 5: Table Of Contents

    Table of Contents Page Warranty ......................ii EC Declaration of Conformity ................ iii List of Figures List of Tables Safety Symbols and Terms ................vii General Warnings and Cautions ..............vii Abbreviations ....................viii Specifications ....................ix Section 1 –...
  • Page 6 Section 3 – Principles of Operation Introduction ..................14 Functional Description ................ 14 Measurement Considerations ............15 3.3.1 Detector Calibration and Accuracy ........15 3.3.2 Quantum Detector Temperature Effects ........ 16 3.3.3 Thermopile Detector Temperature Effects ......16 3.3.4 Energy Detector Temperature Effects ........16 3.3.5 Ambient and Stray Light ............
  • Page 7: List Of Figures

    Figure 9 Pulse Signal Detection ..............12 Figure 10 Detector Time Constant ACCEL. ADJ. Setting ....... 13 Figure 11 Simplified Model 1825-C Functional Block Diagram ..... 14 Figure 12 Typical Energy Detector Signal Waveform ........15 List of Tables Table 1 Model 1825-C Display Annunciators ..........
  • Page 8: Safety Symbols And Terms

    42VDC or 42V peak AC. Do not exceed 42V between any portion of the Model 1825-C (or any attached detector or probe) and earth ground or a shock hazard will result.
  • Page 9: Abbreviations

    Abbreviations amps alternating current analog-to-digital converter battery biconic fiber connector standard coaxial connector type °C degrees Centigrade direct current °F degrees Fahrenheit hertz (cycles per second) current-to-voltage converter kilohertz kΩ kiloOhms least significant digit milliamps millivolts nanoamps nanofarads nanometers peak-to-peak relative humidity serial number µA...
  • Page 10: Specifications

    Specifications Physical Specifications 3.75 × 7.5 × 9.25 in. (95 × 191 × 235 mm) Dimensions: Weight: 5 lb (2.3 kg) Enclosure: Metal case, painted Connectors: Signal Input BNC; Signal Output BNC; Power 2.5 mm Phone Jack Power: 12 VDC, 200 mA unregulated Battery Life: 20 hours Battery Type:...
  • Page 11 Electrical Specifications: Position 6 Position 7 Position 8 Position 5 Position 4 Position 9 Position 3 Position 10 Position 2 Position 11 Position 1 Range Knob Positions Position 12 Range Switch Position 1 & 2 3 & 4 5 & 6 7 &...
  • Page 12: System Overview

    Section 1 General Information System Overview The Model 1825-C is an accurate and flexible optical power and energy mea- suring instrument that provides features typically found only on advanced single purpose optical meters: Simple front panel controls, annunciated digital and analog displays, and compatibility with Newport’s full line of detector families allow the Model 1825-C to meet almost any DC, AC peak-to-peak, pulsed or integrated exposure measurement requirement with minimum fuss.
  • Page 13: Unpacking And Inspection

    Many detectors and detector accessories are available for use with the Model and Services 1825-C Power/Energy Meter. In addition, detector accessories are available. Refer to Figure 1 for the Model 1825-C Power/Energy Meter family tree. For more information, please refer to the Newport Catalog.
  • Page 14: Section 2 - System Operation

    Newport’s compatible detectors. Display The Model 1825-C combines a fast response 3.5 inch analog display with a 3.5 digit annunciated LED display, see Figure 2. The full scale reading of the analog display alternates between 2 and 5 as the RANGE knob is rotated so that it can display signals below 2.00 with higher resolution.
  • Page 15: Front And Rear Panel Controls

    For general operation, only the front panel controls are used. The rear panel controls and settings are primarily used for meter/ detector setup. The front panels of the Model 1825-C are shown in Figure 3. The following table gives a short description of each control: Table 2 —...
  • Page 16: Range

    Figure 4 — Model 1825-C Rear Panel Detail 2.3.1 RANGE The RANGE knob adjusts the signal gain of the Model 1825-C. It has twelve positions covering 6 decades of signal gain. Intermediate gain positions only change the full scale reading of the analog display and do not effect either the digital display or the analog output.
  • Page 17: Average

    2.3.4 MODE The front panel MODE knob sets the method of signal acquisition that the Model 1825-C will use with a given detector. Not every mode can be used with every detector. Table 3, below, indicates which modes are compatible with the various Newport detector types.
  • Page 18: Setup Dip Switches

    1. Turn the Model 1825-C off and insert the charging plug into the rear panel 12V DC input. 2. Plug the AC adaptor into the wall. You may now turn the Model 1825-C back on.
  • Page 19: Power Up

    See Section 2.4.1. 2.4.3 Detector Connection and Setup Connect the detector to the INPUT BNC found on the rear of the Model 1825-C. You may connect or disconnect any Newport Low-Power, High-Power or Energy detector at any time without damage. Adjust the SETUP dip switches to reflect the type of Newport detector that the Model 1825-C is being used with.
  • Page 20: Calibration Factor Mantissa Entry

    The EXP. ADJ. rarely needs to be set more than once when using the Model 1825-C with a particular detector. However, it is still wise to check that the EXP. ADJ. does not need resetting when making measurements at multiple wavelengths.
  • Page 21: Signal Integration

    2.4.6 Signal Integration The Model 1825-C provides a circuit which measures optical energy by electronically integrating the signal from a power sensing detector. This mode of operation is only compatible with Low-Power and High-Power detectors. Signal integration is enabled when the MODE switch is set to INTEG.
  • Page 22: Peak-To-Peak Power Measurement

    If the CAL slide switch is set to BEEP ON while in the P-P mode, the Model 1825-C will give a short “click” with the arrival of each trigger. This is particu- larly useful for infrared wavelengths and for listening for changes in the pulse repetition rate.
  • Page 23: Detector Acceleration Time Constant

    Figure 9 — Pulse Signal Detection 2.4.9 Detector Acceleration Time Constant The Model 1825-C provides a circuit to electronically accelerate the risetime of Newport’s High-Power thermopile detectors. Acceleration occurs when the SETUP switch position 8 is set to “1”. A back panel potentiometer, ACCEL ADJ., is used to adjust the time constant of the acceleration circuit to match...
  • Page 24: Analog Output

    Figure 10 — Detector Time Constant ACCEL. ADJ. Setting 2.4.10 Analog Output The Model 1825-C provides a 0 to 2 volt BNC analog output for signal monitor- ing. The analog output voltage reflects actual measurement by being equal to the digital display’s digits and ignores the decimal point position. Thus, if the digital display indicates 1.560, then the analog output voltage will be 1.560...
  • Page 25: Section 3 - Principles Of Operation

    These detector families are based on semiconductor, thermopile and pyroelec- tric detectors respectively. A block diagram of signal flow through the Model 1825-C is shown in Figure 11. The actual flow through the diagram depends upon the MODE and SETUP switch settings.
  • Page 26: Measurement Considerations

    The flexibility of the Model 1825-C is required in order that it may properly measure the signals that various types of detectors make. Optical power or energy is related to a detector signal, S , in the following way: λ...
  • Page 27: Quantum Detector Temperature Effects

    1,000 to 10,000 times greater than silicon. These dark currents can be zeroed by the Model 1825-C’s ZERO knob. Since dark currents drift with temperature, the ZERO should be adjusted just prior to taking any measurements. The noise or drift in the dark current sets a lower bound on the measurement resolution which can be achieved with any given detector.
  • Page 28: Performing Basic Measurements

    (or air currents when using Newport’s High-Power disk thermopile detectors) which is not coming from the source, and turning off room and other lights. Performing Basic Basic measurement techniques for using the Model 1825-C are covered in the Measurements following sections. Also included are methods of background correction and common measurement errors.
  • Page 29: Making A Signal Integration Measurement

    1. Set up the meter to reflect the Newport Energy Detector, the calibration factor at the wavelength of light you will be making your energy mea- surement at.
  • Page 30: Common Measurement Errors

    The system measurement accuracy of the Model 1825-C Power/Energy Meter is primarily governed by the calibration accuracy of the attached detector. The electronic accuracy of the Model 1825-C generally exceeds the calibration uncertainties of a detector by a decade or more. However, as NIST calibration capabilities improve, system accuracies will begin to experience the influence of electronic accuracy uncertainties.
  • Page 31: Section 4 - Test, Maintenance And Troubleshooting

    Procedures on a damp cloth. CAUTION Do not use acetone or other organic solvents (other than alcohol) on the Model 1825-C Power/Energy Meter. Organic solvents attack the paint. Troubleshooting The following troubleshooting guide is intended to isolate and solve problems...
  • Page 32: Section 5 - Factory Service

    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 the service form, located on page 23, and have the information ready when contacting Newport Corporation.
  • Page 34: Service Form

    Service Form Newport Corporation U.S.A. Office: 949/863-3144 FAX: 949/253-1800 RETURN AUTHORIZATION # Name ____________________________________________________________________________________ ______________________________ Company (Please obtain prior to return of item) ______________________________________________________________________________ Address Date __________________________________________________________________ ________________________________________________________________________________ Country Phone Number __________________________________________________ ________________________________________________________________________________ FAX Number P.O. Number _________________________________________________________________________ _____________________________________________________ Item(s) Being Returned:...
  • Page 37 1791 Deere Avenue Irvine, CA 92606 (In U.S.): 800-222-6440 Tel: 949-863-3144 Fax: 949-253-1680 Internet: Visit Newport Online at: Newport Corporation, Irvine, California, has been certified com- P/N 19572-01, Rev. F pliant with ISO 9001 by the British IN-04925 (04-01) Standards Institution.

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