Agilent Technologies N3970A Operating And Maintenance Manual
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Agilent Technologies N3970A Operating And Maintenance Manual

Agilent Technologies N3970A Operating And Maintenance Manual

Optical power meter
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N3970A OPTICAL POWER METER
Operating and
Maintenance Guide

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Summary of Contents for Agilent Technologies N3970A

  • Page 1 N3970A OPTICAL POWER METER Operating and Maintenance Guide...
  • Page 3 N3970A OPTICAL POWER METER SOURCE QUICK REFERENCE GUIDE To remove interchangeable connector, move interface to mid position, and pull off adaptor. To defeat auto power-off, hold POWER for 3 seconds at turn on until ON and perm are displayed. To access hidden keypad, pull up display cover.
  • Page 4 INTRODUCTION AND A P P L I C AT I O N S N3970A PTICAL OWER ETER Congratulations on your purchase of this instrument, which has been engineered to provide the best possible reliability, convenience and performance. To get the best use from your equipment and ensure its safe operation, please spend a few minutes to read this manual.

  • Page 5: Table Of Contents

    O N T E N T S Service and Support Introduction & applications Safety Summary Battery and external power Optical connector How to use: Getting started and turning on Autotest operation Power meter operation Storing & recalling readings RS232 interface BEFORE READING FURTHER, OPEN THE CONTROL PANEL PICTURE AT THE BACK OF THE MANUAL Care of your instrument Accuracy considerations...

  • Page 6: Service And Support

    Any adjustment, maintenance, or repair of this product must be p e rf o rmed by qualified personnel. Contact your customer engineer through your local Agilent Technologies Serv i c e Center. You can find a list of local service representatives on the Web at: http://www.agilent.com/find/assist...

  • Page 7: Introduction & Applications

    N T R O D U C T I O N A N D P P L I C AT I O N S The N3970A Optical Power Meter is used for field or laboratory testing of fiber optic systems at typically 850, 1300, 1310 and 1550 nm.
  • Page 8 Automated testing and re p o rting using optional Excel software . Test tone measurement & fiber identification. N3970A UM-1 N T R O D U C T I O N A N D P P L I C AT I O N S...

  • Page 9: Safety Summary

    Agilent Technologies Inc. assumes no liability for the customer’s failure to comply with these requirements. Before operation, review the instrument and manual, for safety markings and instructions.

  • Page 10: Safety Summary

    - 10°C and + 55°C and at relative humidity of <95%. Storage and Shipment The Agilent N3970A Power Meter can be stored or shipped at temperatures between - 25°C and + 70°C and at relative humidity of less than 95%. Protect the module fro m temperature extremes that may cause condensation within it.

  • Page 11: Battery And External Power

    ATTERY AND XTERNAL The instrument is powered by two 1.5V dry batteries (Alkaline C) for an operating period of typically 250 hours or two 1.2V rechargeable batteries for an operating period of approximately 125 hours. Do not use lithium batteries or other batteries with a nominal voltage greater than 1.8 V.

  • Page 12: Optical Connector

    Different styles of connector adaptor ( ST, SC, FC, ) can be easily fitted by the user. N3970A UM-1 OPTICAL CONNECTOR Optical connectors are precision components, and require care in use: Always clean the mating connector tip and ferrule before mating, using approved materials.
  • Page 13 OPTICAL CONNECTOR Cleaning The glass power meter interface does not make contact with the inserted connector: there is a slight air gap. Therefore it should not wear out, and only needs occasional cleaning. To clean the glass power meter interface: remove the interchangeable adaptor to access the glass interface, then use a sticky material such as ‘...

  • Page 14: Getting Started And Turning On

    To back light the display temporarily, select LIGHT. To back light continuously, hold down the button for 3 seconds. Use of the back light will drain the batteries faster. N3970A UM-1 GETTING STA RTED AND TURNING ON This instrument uses a menu driven keypad. The function of each button is shown on the display.

  • Page 15: Getting Started And Turning On

    GETTING STA RTED AND TURNING ON To disable or enable the buzzer, hold down SHIFT for 3 seconds. To add the carry strap: slip the end of the strap through the slit on the curved section at the back of the instrument, and secure the buckle.

  • Page 16: Autotest Operation

    Autotest each time. A light source transmits Autotest signals at one or two wavelengths to an appropriate power meter. N3970A UM-1 AUTOTEST OPERAT I O N Operation Turn on the source and meter, and connect them with a test lead.

  • Page 17: Autotest Operation

    AUTOTEST OPERAT I O N meter with a test lead. Set the source to Autotest mode, and then push SET REF on the meter for 3 seconds. This will store the reference at all relevant wavelengths. Either a ‘local’ or ‘remote’ reference can be stored. To exit Autotest mode, either disconnect the optical test lead, or exit Autotest mode on the light source for >...

  • Page 18: Power Meter Operation

    2 KHz ), a buzzer will sound. This is useful for fiber identification and signalling. The meter can also be used to check the actual modulation frequency of test sources. N3970A UM-1 O W E R E T E R...

  • Page 19: Storing & Recalling Readings

    & R TORING ECALLING There are various ways of storing and recording data, giving the user flexible ways of working. They are summarised here for your convenience. Storage of reference values: A separate reference is stored for each and can be recalled when the instrument is next turned Display hold: To hold the display at it’s current value, push HOLD.
  • Page 20 Store data starting at a particular location: push SELECT, +/-, SET, STORE The memory can not be read in Autotest mode. Exit Autotest before reading the memory. N3970A UM-1 & R TORING ECALLING Read from any location: push RECALL, +/-. To display the relative value, push ABS/REL, and to display the reference, hold down ABS/REL.

  • Page 21: Rs232 Interface

    RS232 INTERFA C E The connection details of the instrument, and connecting cables are as follows : Some (out of spec) serial ports need a 10 K resistor in the D connector across wires 1 & 2. Instrument Jack Plug 9 Pin D connector for RS232 The RS232 interface can be used to access and control the instrument from an external computer.

  • Page 22: Care Of Your Instrument

    Where possible, keep instrument away from strong sunlight. During prolonged storage, remove batteries to eliminate the possibility of acid leakage. Use only high quality sealed alkaline batteries. N3970A UM-1 ARE OF NSTRUMENT Clean the instrument using alcohol or other non solvent cleaning agents.

  • Page 23: Accuracy Considerations

    Polarisation changes create disturbances in both the optical system and measurement equipment. To reduce this, keep your system physically stable. Keep patch leads neat, coiled and stable. The N3970A Optical Power Meter has an InGaAs detector.
  • Page 24 ACCURACY CONSIDERATIONS N3970A UM-1...
  • Page 25 & M ALIBRATION AINTENANCE Enabling / disabling ‘shift’ keypad & re-booting the microprocessor: See section on ‘getting started & turning on. Calibration Calibration can be readily performed without opening the instrument. Calibration is performed by setting up a singlemode laser source at a stable but non-critical power level between -10 and -30 dBm, and adjusting the meter reading to the same value as that shown by a reference meter.
  • Page 26 Do no forget to update your calibration re c o rds, and schedule the next due date. N3970A UM-1 & M ALIBRATION Maintenance CAUTION! Do not open unless the warranty has expired, you are authorised to do so, and you have a static protected work station.

  • Page 27: Calibration , Maintenance & Instrument Returns

    25 mA. B e f o re re t u rning equipment for repair or calibration, please check with your local Agilent Technologies Service Center (see page 3 Service and Support) to obtain a tracking number and shipping details. If the instrument is being returned for calibration, please include a purchase order.

  • Page 28: Specifications - Definition Of Terms

    The uncertainty for a specified set of operating conditions, including noise and drift (connectors and patchcords must be absolutely clean and undamaged). Autotest sensitivity The power level below which the Autotest does not work. N3970A UM-1 SPECIFICATIONS - DEFINITION OF TERMS...

  • Page 29: Specifications And Ordering Information

    & O PECIFICATIONS RDERING Sensor Element Wavelength Range Calibration Wavelengths Power Range Maximum Input Power Uncertainty at reference conditions Total Uncertainty Autotest sensitivity (typical) Operating Time Applicable Fiber Type Optical Input Display Type Display Resolution Display Units NFORMATION InGaAs 850-1650 nm , 1300, 1310, 1550 nm +5 to –60 dBm (850 nm) +5 to –70 dBm (other wavelengths)
  • Page 30 Damage level: > 5 dB above max reading. Case: Polycarbonate, 1 meter drop tested. RS232: 3.5 mm jack connector, 0.3 - 56 Kbaud, default 9.6 K. Calibration: Performed without opening instrument. Printing: Not supported. N3970A UM-1 & O PECIFICATIONS RDERING NFORMATION...
  • Page 31 & O PECIFICATIONS RDERING ORDERING INFORMATION Instrument N3970A Optical Power Meter Standard accessories: Included with instrument: FC, ST, SC optical connector, manual, batteries, NATA traceable calibration certificate, carry strap, pouch, protective holster & RS 232 cable. Connector options: This instrument is equipped with interchangeable optical connector adaptors, and works with both PC and APC connectors.

  • Page 32: Performance Test

    The procedures in this section test the performance of the instrument. The complete specifications to which the Agilent N3970A Optical Power Meter is tested are given on pages 26-28. All tests can be performed without access to the interior of the instrument.
  • Page 33 Connector Adaptors Singlemode Fiber FC Connector Adaptor for N3970A Note: Instead of 8163A, 81618A, 81624A #C01 and 81654A also the older but discontinued equipment 8153A, 81533B, 81524A #C01 and 81554SM together with 81210LI #011 and 81310LI # 011 can be used.

  • Page 34: Test Record

    Agilent Technologies. Test Failure If the Agilent N3970A fails any performance test, return the instrument to the nearest Agilent Technologies Sales/Service Office for repair (see page 3).
  • Page 35 PERFORMANCE TEST Performance Test The performance test given in this section includes the Total Uncertainty/Accuracy Test. Perform each step in the order given, using the corresponding test equipment. Note Make sure that all optical connections are dry and clean. DO NOT USE INDEX MATCHING OIL. For cleaning, use the cleaning instructions given in "Cleaning Procedures"...
  • Page 36 Set the wavelength to the wavelength of the laser source With the laser source and attenuator disabled, zero the power meter e. Switch on the N3970A (DUT) for permanent operation, by holding the POWER key down for 3 seconds during turn-on N3970A UM-1 PERFORMANCE TEST until PERM is shown in the display.
  • Page 37 PERFORMANCE TEST 6. Measure the DUT. a. Make sure the N3970A (DUT) has warmed up b. Connect the attenuator output cable to the DUT as shown in figure below. Test Setup for the DUT Measurement c. Select the correct wavelength on the DUT.
  • Page 38 Model N3970A Optical Power Meter Serial No. Options Firmware Rev. Test Facility Performed by Special Notes N3970A UM-1 PERFORMANCE TEST Date Ambient Temperature Relative Humidity Line Frequency Customer Report No...
  • Page 39 PERFORMANCE TEST Description 1. Lightwave Multimeter 2. Light Source 1310/1550 nm 3. Optical Head 4. Optical Head Interface Module 5. Optical Attenuator Accessories Singlemode Fiber Connector Interfaces Connector Adaptors Model No. Trace No 8163A 81654A 81624A #C01 81618A 8156A #101 #Product 1 81101AC 1 81101PC...
  • Page 40 Model N3970A Optical Power Meter Total Uncertainty/Accuracy Test Test Wavelengths = 1300 nm and 1310 nm Source Wavelength = Setting Reference Attenuator Number Setting (8163A Display) -3.00 dBm -20.00 dBm -30.00 dBm -50.00 dBm Measurement Uncertainty N3970A UM-1 Report No.
  • Page 41 PERFORMANCE TEST Model N3970A Optical Power Meter Total Uncertainty/Accuracy Test Test Wavelengths = 1550 nm Source Wavelength = Setting Reference Attenuator Number (8163A Display) -3.00 dBm -20.00 dBm -30.00 dBm -50.00 dBm Measurement Uncertainty Report No. Minimum Spec. Setting (-0.3 dB of Ref.) -3.30 dBm...

  • Page 42: Cleaning Information

    If you are unsure of the correct cleaning procedure for your optical device, we recommend that you first try cleaning a dummy or test device. Agilent Technologies assume no liability for the customer's failure to comply with these requirements. For more information about Cleaning Instruments, please consult the Pocket Guide "Cleaning Procedures for Lightwave...
  • Page 43 CLEANING INFORMAT I O N dampened with water, to clean the external case parts. Do not attempt to clean internally. Do not install parts or perform any unauthorised modification to optical devices. * Refer servicing only to qualified and authorised personnel. Why is it important to clean optical devices ? In transmission links optical fiber cores are about 9 µm (0.00035") in diameter.

  • Page 44: Cleaning Procedures

    N3970A UM-1 CLEANING PROCEDURES 1. Moisten a new cotton swab with isopropyl alcohol.

  • Page 45: Disclaimer & Warranty

    Information in this manual is given in good faith for the benefit of the user. It cannot be used as the basis for claims against Agilent Technologies or its re p resentatives, if accidental damage or inconvenience results from use or attempted repair of the equipment.

  • Page 46: Notes

    N O T E S N3970A UM-1...
  • Page 47 N O T E S...

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