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HP 83491A User Manual

Clock recovery modules.
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User's Guide
HP 83491/2/3A
Clock Recovery Modules

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   Summary of Contents for HP HP 83491A

  • Page 1 User’s Guide HP 83491/2/3A Clock Recovery Modules...
  • Page 2 Hewlett-Packard Com- remedies. Hewlett-Packard tions of the instrument pany will, at its option, either shall not be liable for any HP Part No. 83491-90011 power line switch. repair or replace products direct, indirect, special, inci- Printed in USA which prove to be defective.
  • Page 3: General Safety Considerations

    W A R N I N G Light energy can radiate from the front panel Output connectors on HP 83492A and HP 83493A modules. The light emitted from these connectors is the slightly attenuated light that is input to the front- panel Input connector.
  • Page 4 General Safety Considerations...
  • Page 5: Table Of Contents

    Front-Panel Features 2-4 Block Diagrams 2-7 To display a signal 2-8 To compensate for module insertion loss 2-9 Using Probes with an HP 83491A 2-10 3 Specifications and Regulatory Information HP 83491A Specifications 3-3 HP 83492A Specifications 3-4 HP 83493A Specifications 3-6...
  • Page 6 Contents Contents-2...
  • Page 7 To install the module 1-3 To connect cables to an HP 83492A 1-7 Installation...
  • Page 8: Installation Installation

    Installation HP 83491/2/3A modules require that firmware revision A.06.25 or later be installed in the HP 83480A. If you wish to install the module in an HP 54750A digitizing oscilloscope, you must first install the HP 83480K communications firmware upgrade kit.
  • Page 9 If your shipment is damaged or incomplete, save the packing materials and notify both the shipping carrier and the nearest Hewlett-Packard Sales and Service office. HP will arrange for repair or replacement of damaged or incom- plete shipments without waiting for a settlement from the transportation com- pany.
  • Page 10 HP 83492A and HP 83493A modules. The light emitted from these connectors is the slightly attenuated light that is input to the front- panel Input connector. 6 Turn on the HP 83480A, and connect a modulated signal to the HP 83491/2/3A module’s Input connector.
  • Page 11 Repeatedly pressing the SELECT key cycles through the selections in one color before switching to the opposite color. On HP 83491A modules for example, the first selection cycle shows 155 Mb/s selected. The second section cycle shows 1062...
  • Page 12 Installation Installation Figure 1-4. Front-panel lights 9 Confirm that the Unlocked light is off. 10 Observe the Clock and Data outputs on an oscilloscope. Waveforms should be present. The instrument is now ready for you to begin making measurements.
  • Page 13 Installation To connect cables to an HP 83492A On HP 83492A modules, the front-panel fiber-optic connectors reverse input and output roles depending on the wavelength of the signal. Signals in the 750 nm to 860 nm wavelength range are input to the left connector and output from the right connector.
  • Page 14 Installation Installation...
  • Page 15: Operation

    Block Diagrams 2-7 To display a signal 2-8 To compensate for module insertion loss 2-9 Using Probes with an HP 83491A 2-10 To compensate for a passive probe 2-11 To compensate an HP 54701A active probe 2-11 To compensate for other devices 2-11...
  • Page 16: Hp 83491/2/3a Modules-at A Glance

    HP 83480A Digital Communications Analyzer. These modules recover clock and data information at standard telecom and datacom rates. The resulting trigger signal is made available to the HP 83480A mainframe via a connector located on the module’s rear-panel. An external front-panel cable passes the data signal, with some insertion loss, to the receiver module.
  • Page 17 What you won’t find on these modules . . . Unlike other modules designed to be used with the HP 83480A digital communications analyzer, the HP 83491/2/3A modules do not include Channel keys or menus. Also, there are no GPIB programming commands for these modules.
  • Page 18: Front-panel Features

    Operation Front-Panel Features Front-Panel Features Figure 2-2. HP 83491/2/3A front panels SELECT key Pressing this key changes the modulation rate of the input signal. The recov- ered and retimed clock trigger is sent to the mainframe. The Trigger On Data selection is a bypass mode where the data stream directly triggers the main- frame.
  • Page 19 Repeatedly pressing the SELECT key cycles through the selections in one color before switching to the opposite color. On HP 83491A modules for example, the first selection cycle shows 155 Mb/s selected. The second section cycle shows 1062 Mb/s selected.
  • Page 20 Operation Front-Panel Features Multimode and single-mode connections HP 83492A modules use multimode fiber. Connecting the output to the Optical Input con- nector on HP 83481/2/5 single-mode modules results in large reflections and insertion loss. HP 83493A modules use 9/125 µm single-mode fiber. Connecting multimode fiber to the Optical Input connector results in large reflections and insertion loss.
  • Page 21: Block Diagrams

    Operation Block Diagrams Block Diagrams Figure 2-3. HP 83491A Block Diagram Figure 2-4. HP 83492A and HP 83493A Block Diagram...
  • Page 22: To Display A Signal

    Repeatedly pressing the SELECT key cycles through the selections in one color before switching to the opposite color. On HP 83491A modules for example, the first selection cycle shows 155 Mb/s selected. The second section cycle shows 1062 Mb/s selected.
  • Page 23: To Compensate For Module Insertion Loss

    1 Disconnect the cable from the clock recovery module’s Input connector. 2 Measure the signal using a power meter. You can use either the HP 83480A’s built-in power meter or an external power meter.
  • Page 24: Using Probes With An Hp 83491a

    Using Probes with an HP 83491A Using Probes with an HP 83491A You can use external passive and active probes with the HP 83491A electrical clock recovery module. The procedures in this section generate vertical scale factors. These factors are applied to the calibration of the reference receiver module’s electrical channel.
  • Page 25: To Compensate For A Passive Probe

    Using Probes with an HP 83491A To compensate for a passive probe 1 Connect the probe to the Input connector on the HP 83491A clock recovery module. 2 Attach the probe tip to the CAL hook that is located near the floppy disk drive.
  • Page 26 Operation Using Probes with an HP 83491A 4 Press Ext gain, and enter the actual gain characteristics of the device. 5 Press Ext offset, and enter the offset introduced by the device. 2-12...
  • Page 27: Specifications And Regulatory Information

    HP 83491A Specifications 3-3 HP 83492A Specifications 3-4 HP 83493A Specifications 3-6 HP 83491/2/3A Operating Specifications 3-7 Declaration of Conformity 3-8 Specifications and Regulatory Information...
  • Page 28 Characteristics are printed in italics. Calibration cycle HP warrants instrument specifications over the recommended calibration interval. To maintain specifications, periodic recalibrations are necessary. We recommend that the HP 83491/2/3A Clock Recovery Modules be calibrated at an HP service facility every 24 months.
  • Page 29: Hp 83491a Specifications

    Specifications and Regulatory Information HP 83491A Specifications HP 83491A Specifications Table 3-1. HP 83491A Specifications Clock recovery rates (NRZ coding) 155.52 Mb/s ±0.1% 622.08 Mb/s ±0.1% 1062.50 Mb/s ±0.1% 1250 Mb/s ±0.1% 2125.00 Mb/s ±0.1% 2488.32 Mb/s ±0.1% 2500.00 Mb/s ±0.1%...
  • Page 30: Hp 83492a Specifications

    Specifications and Regulatory Information HP 83492A Specifications HP 83492A Specifications Table 3-2. HP 83492A Specifications Wavelength range (characteristic) 750 nm to 860 nm and 1000 nm to 1600 nm Optical INPUT and OUTPUT fiber (characteristic) 62.5/125 multimode Optical insertion loss (through path) ≤...
  • Page 31 Specifications and Regulatory Information HP 83492A Specifications a. Minimum loss in 850 nm window. b. Single-mode backreflection tested with FC/PC adapter and single-mode fiber. Optical output terminated µ with > 33 dB return loss. Return loss with fully filled 62.5 m core multimode fiber may be slightly lower.
  • Page 32: Hp 83493a Specifications

    Specifications and Regulatory Information HP 83493A Specifications HP 83493A Specifications Table 3-3. HP 83493A Specifications Wavelength range (characteristic) 1000 nm to 1600 nm Optical INPUT fiber (characteristic) 9/125 single mode ≤ Optical insertion loss (through path) 1.5 dB ≥ Optical return loss...
  • Page 33: Hp 83491/2/3a Operating Specifications

    Specifications and Regulatory Information HP 83491/2/3A Operating Specifications HP 83491/2/3A Operating Specifications Table 3-4. HP 83491/2/3A Operating Specifications Iindoor Temperature ° ° Operating C to +55 ° ° Non-operating –40 C to +70 Altitude Operating 4600 m (15,000 ft) Non-operating...
  • Page 34: Declaration Of Conformity

    Specifications and Regulatory Information Declaration of Conformity Declaration of Conformity...
  • Page 35: Reference

    Front-Panel Optical Adapters 4-2 In Case of Difficulty 4-3 Error Messages 4-5 Electrostatic Discharge Information 4-8 Cleaning Connections for Accurate Measurements 4-10 Returning the Module for Service 4-21 Hewlett-Packard Sales and Service Offices 4-24 Reference...
  • Page 36: Front-panel Optical Adapters

    Reference Front-Panel Optical Adapters Front-Panel Optical Adapters Figure 4-1. Front-panel adapters for input and output connectors...
  • Page 37: In Case Of Difficulty

    ❒ Is the rear-panel line switch set to on? ❒ Will the mainframe power up without the plug-in module installed? If the mainframe still does not power up, refer to the optional HP 83480A, HP 54750A Service Guide or return the mainframe to a qualified service department.
  • Page 38 3.5 inch diskette. To load new firmware, follow the instructions provided with this diskette. If you do not have the optional diskette, contact your local HP Sales and Service Office (refer to “Hewlett- Packard Sales and Service Offices” on page 4-24).
  • Page 39: Error Messages

    If the suggestions do not eliminate the error message, then additional troubleshooting is required that is beyond the scope of this book. Additional error messages are listed in the HP 83480A, HP 54750A User’s Guide for the mainframe.
  • Page 40 ❒ Verify the knurled screws at the bottom of the plug-in module are finger tight. ❒ The standard HP 54750A mainframe does not accept the HP 83491/2/3A Light- wave Clock Recovery Modules module. To use the module, a firmware upgrade...
  • Page 41 Options 001 and 002 provide this firmware on a 3.5 inch diskette. To load the new firmware, follow the instructions provided with the diskette. If you do not have the optional diskette, contact your local HP Sales and Service Office.
  • Page 42: Electrostatic Discharge Information

    Reference Electrostatic Discharge Information Electrostatic Discharge Information Electrostatic discharge (ESD) can damage or destroy electronic components. All work on electronic assemblies should be performed at a static-safe work station. The following figure shows an example of a static-safe work station using two types of ESD protection: •...
  • Page 43 • Personnel should be grounded with a resistor-isolated wrist strap before re- moving any assembly from the unit. • Be sure all instruments are properly earth-grounded to prevent a buildup of static charge. Table 4-1. Static-Safe Accessories HP Part Number Description × × 9300-0797 Set includes: 3M static control mat 0.6 m...
  • Page 44: Cleaning Connections For Accurate Measurements

    Reference Cleaning Connections for Accurate Measurements Cleaning Connections for Accurate Measurements Today, advances in measurement capabilities make connectors and connec- tion techniques more important than ever. Damage to the connectors on cali- bration and verification devices, test ports, cables, and other devices can degrade measurement accuracy and damage instruments.
  • Page 45 When tighter alignment is required, HP instru- ments typically use a connector such as the Diamond HMS-10, which has con- centric tolerances within a few tenths of a micron. HP then uses a special universal adapter, which allows other cable types to mate with this precision connector.
  • Page 46 0.2 µm. This process, plus the keyed axis, allows very precise core-to-core alignments. This connector is found on most HP lightwave instruments. 4-12...
  • Page 47 Reference Cleaning Connections for Accurate Measurements The soft core, while allowing precise centering, is also the chief liability of the connector. The soft material is easily damaged. Care must be taken to mini- mize excessive scratching and wear. While minor wear is not a problem if the glass face is not affected, scratches or grit can cause the glass fiber to move out of alignment.
  • Page 48 Reference Cleaning Connections for Accurate Measurements Figure 4-6. Clean, problem-free fiber end and ferrule. Figure 4-7. Dirty fiber end and ferrule from poor cleaning. Figure 4-8. Damage from improper cleaning. While these often work well on first insertion, they are great dirt magnets. The oil or gel grabs and holds grit that is then ground into the end of the fiber.
  • Page 49 Reference Cleaning Connections for Accurate Measurements nectors, using small glass spheres. When used with contacting connectors, these glass balls can scratch and pit the fiber. If an index matching gel or oil must be used, apply it to a freshly cleaned connector, make the measurement, and then immediately clean it off.
  • Page 50 The procedures in this section provide the proper steps for cleaning fiber- optic cables and HP universal adapters. The initial cleaning, using the alcohol as a solvent, gently removes any grit and oil. If a caked-on layer of material is...
  • Page 51 If you think the use of such compounds is necessary, refer to the compound manufacturer for information on application and cleaning procedures. Table 4-2. Cleaning Accessories Item HP Part Number Isopropyl alcohol 8500-5344 Cotton swabs 8520-0023...
  • Page 52 To clean an adapter The fiber-optic input and output connectors on many HP instruments employ a universal adapter such as those shown in the following picture. These adapt- ers allow you to connect the instrument to different types of fiber-optic cables.
  • Page 53 Caring for electrical connections The following list includes the basic principles of microwave connector care. For more information on microwave connectors and connector care, consult the Hewlett-Packard Microwave Connector Care Manual, HP part number 08510-90064. Handling and Storage • Keep connectors clean •...
  • Page 54 Reference Cleaning Connections for Accurate Measurements Making Connections • Align connectors carefully • Make preliminary connection lightly • To tighten, turn connector nut only • Do not apply bending force to connection • Do not overtighten preliminary connection • Do not twist or screw in connectors •...
  • Page 55: Returning The Module For Service

    HP Instrument Support Center ......(800) 403-0801 If the module is still under warranty or is covered by an HP maintenance con- tract, it will be repaired under the terms of the warranty or contract (the war- ranty is at the front of this manual).
  • Page 56 Reference Returning the Module for Service information should be returned with the module. • Type of service required. • Date module was returned for repair. • Description of the problem: • Whether problem is constant or intermittent. • Whether module is temperature-sensitive. •...
  • Page 57 Reference Returning the Module for Service plastic sheet filled with air bubbles. Use the pink (antistatic) Air Cap™ to reduce static electricity. Wrapping the module several times in this material will protect the module and prevent it from moving in the carton. 4 Seal the carton with strong nylon adhesive tape.
  • Page 58: Hewlett-packard Sales And Service Offices

    Reference Hewlett-Packard Sales and Service Offices Hewlett-Packard Sales and Service Offices Before returning an instrument for service, call the HP Instrument Support Center at (800) 403-0801. Hewlett-Packard Sales and Service Offices (1 of 2) U.S. FIELD OPERATIONS Headquarters California, Northern...
  • Page 59 Reference Hewlett-Packard Sales and Service Offices Hewlett-Packard Sales and Service Offices (2 of 2) INTERCON FIELD OPERATIONS Headquarters Australia Canada Hewlett-Packard Company Hewlett-Packard Australia Ltd. Hewlett-Packard Ltd. 3495 Deer Creek Rd. 31-41 Joseph Street 17500 South Service Road Palo Alto, California 94304-1316 Blackburn, Victoria 3130 Trans-Canada Highway (415) 857-5027...
  • Page 60 Reference Hewlett-Packard Sales and Service Offices 4-26...
  • Page 61 4-19 green light, cotton swabs, 4-17 customer assistance, HP 1163A probe, 2-10 HP 54006A low impedance probe, 2-10 damaged shipment, HP 54701A active probe, 2-10, 2-11 DATA Auxiliary Output connector, HP 54750A digitizing oscilloscope, data rate HP 83492A...
  • Page 62 Index procedure, 4-21 single-mode fiber, IEC 1010, specifications, IEC 664, defined, Input connector, 1-2, 1-7, 4-10 HP 83491A, input connector, HP 83492A, input signal, maximum safe, HP 83493A, insertion loss, 2-3, operating, compensation, temperature range, INSTALLATION CATEGORY II, swabs, 4-17...

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