Agilent Technologies E8257D Option HAR User's And Service Manual
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Agilent Technologies E8257D Option HAR User's And Service Manual

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  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 Agilent E8257D Option HAR User’s and Service Guide Agilent Technologies...
  • Page 3 Notices © Agilent Technologies, Inc. 2007 Manual Part Number computer software” as defined in FAR 52.227-19 (June 1987) or any equivalent No part of this manual may be reproduced E8251-90319 agency regulation or contract clause. Use, in any form or by any means (including...
  • Page 4 Safety Notes The following safety notes are used throughout this document. Familiarize yourself with each of these notes and its meaning before performing any of the procedures in this document. WARNING Warning denotes a hazard. It calls attention to a procedure which, if not correctly performed or adhered to, could result in injury or loss of life.

  • Page 6: Table Of Contents

    Operation ..............8 E8257D Option HAR Using the E5500 Phase Noise Measurement Subsystem ..8 Service .
  • Page 7 Contents Contents-2...

  • Page 8: E8257D Option Har

    E8257D Option HAR User’s and Service Guide...

  • Page 9: Description

    Description Description The E8257D Option HAR is a frequency divider designed to provide improved phase noise in the 0.98 MHz to 500 MHz frequency range of the E8257D Signal Generator. The Option HAR uses frequency division as a replacement for heterodyne mixing to create frequencies in the 0.98 to 500 MHz range.

  • Page 10: Specifications

    E8257D Option HAR Specifications Specifications The E8257D Option HAR provides improved absolute phase noise in the 0.98 to 500 MHz frequency range. To achieve these improvements the Divider Mode must be turned On. “Operation” on page The E8257D Option HAR impacts standard instrument performance for frequencies ≤...

  • Page 11: Typical Performance

    E8257D Option HAR Typical Performance Typical Performance Phase Noise Table 3 Absolute Single Sideband Phase Noise (dBc/Hz) Frequency Offset from Carrier (Typical) Carrier 1 Hz 10 Hz 100 Hz 1 kHz 10 kHz 100 kHz Frequency (MHz) −120 −142 −155 −160...
  • Page 12 E8257D Option HAR Typical Performance Table 5 Option 532 or 540 Maximum Leveled Output Power (Typical) Carrier Lowband Filter Frequency 1 MHz 10 MHz 100 MHz 160 MHz 250 MHz 500 MHz 1.Amplitude accuracy is not specified in diver mode.

  • Page 13: Modulation

    E8257D Option HAR Typical Performance Modulation Frequency Modulation Table 7 Maximum FM Modulation Deviation (Typical) Carrier Frequency > 0.98 MHz to 1.953 MHz 3.906 > 1.953 MHz to 3.906 MHz 7.8125 > 3.906 MHz to 7.813 MHz 15.625 > 7.813 MHz to 15.63 MHz 31.25...

  • Page 14: Amplitude Modulation

    E8257D Option HAR Typical Performance Amplitude Modulation AM modulation is not recommended in divider mode. In divider mode, ALC Bandwidth is limited to 100 Hz and dynamic range is restricted below 500 MHz. Pulse Modulation Divider Mode On: Standard Pulse (UNU) can not be used in divider mode. Option UNW can be used.

  • Page 15: Operation

    Subsystem The E5500 software currently does not recognize Option HAR. To improve reference phase noise when using your E8257D Option HAR with the E5500, manually turn the Divider Mode On (refer to Operation), when the “Agilent E5500 Instrument Connections” window appears.

  • Page 16: Service

    Service Troubleshooting 1. Before troubleshooting E8257D Option HAR, verify that the standard instrument is operating properly with the Divider Mode Off. If not, troubleshoot in Standard Mode. 2. For the instrument to operate properly with the Option HAR circuitry installed (Divider Mode On or Off), licenses are needed for the following options: •...
  • Page 17 E8257D Option HAR Service If there is excessive loss in one path, replace the Divider Assembly. If there is excessive loss in both paths, remove the ribbon cable from the Divider Assembly and measure the following voltages at the end of the ribbon cable.

  • Page 18: Replaceable Parts

    E8257D Option HAR Service Replaceable Parts Table 10 Replaceable Parts Description Agilent Part Number Option 1EH Board E8251- 60595 Div Board E8251- 60433 Ribbon Cable E8251- 60594 Cable (Frac- N to Div) E8251- 20394 Cable (Div to Lowband filter) E8251- 20395...

  • Page 19: Setting Up The E5500 Software

    Step 11. Select the icon with the green check-mark. Verify that the connection to the selected asset has been completed. Press OK. Step 12. Verify that the Library field identifies Agilent Technologies VISA. Step 13. Close the Asset Manager. Step 14. Verify that the Phase Noise System is connected as shown in Figure 4.

  • Page 20: 10 Mhz Phase Noise Test Limits

    E8257D Option HAR Service Figure 4 Test Setup Block Diagram E8257D Option HAR under test EXT 1 Input RF OUTPUT 50 Ω 70420A-001 Test Set * 70427A Downconverter * Spectrum Analyzer * REF INPUT 100 MHz +8 dBm (REAR PANEL) 50 KHz - 1.2 -...
  • Page 21 E8257D Option HAR Service Table 13 10 MHz Phase Noise System Setup Parameter Setting Type and Range Tab: Measurement Type Absolute Phase Noise (using a phase locked loop) Start Offset Frequency 1 Hz Stop Offset Frequency 2 MHz (2E+6) FFT Averages...

  • Page 22: Making The 10 Mhz Measurement

    E8257D Option HAR Service Table 13 10 MHz Phase Noise System Setup Parameter Setting Graph Type Single- sideband Phase Noise (dBc/Hz) X Scale Minimum 1 Hz X Scale Maximum 100E+6 Y Scale Maximum −170 Y Scale Minimum Normalize Trace Data to...

  • Page 23: 100 Mhz Phase Noise Test Limits

    E8257D Option HAR Service 100 MHz Phase Noise Test Limits Table 14 Phase Noise Test Limits 100 MHz 1 Hz 10 Hz 100 Hz 1 kHz 10 kHz 100 kHz Noise −73 −100 −122 −140 −145 −145 Spec 100 MHz Test Procedure Using the E5504B Phase Noise Measurement System.
  • Page 24 E8257D Option HAR Service Table 15 100 MHz Phase Noise System Setup Parameter Setting Type and Range Tab: Measurement Type Absolute Phase Noise (using a phase locked loop) Start Offset Frequency 1 Hz Stop Offset Frequency 20 MHz (20E+6) FFT Averages...

  • Page 25: Making The 100 Mhz Measurement

    E8257D Option HAR Service Table 15 100 MHz Phase Noise System Setup Parameter Setting Title 100 MHz Agilent E8257D SNxxxxxxxx Graph Type Single- sideband Phase Noise (dBc/Hz) X Scale Minimum 1 Hz X Scale Maximum 100E+6 Y Scale Maximum −170...

  • Page 26: Appendix

    E8257D Option HAR Appendix Appendix Modifying Synthesizer Self Test Limits This procedure allows you to modify the synthesizer A6 Frac N self test limits for test 704, after replacing the A6 Frac N assembly. (Firmware versions C.04.70 and later). Open a browser window and type the IP address of the instrument, followed by ‘/update’ as shown: http://xxx.xxx.xxx.xxx/update.

  • Page 27: Safety And Regulatory Information

    Declaration of Conformity For a copy of the manufacturer’s Declaration of Conformity for this apparatus, contact your local Agilent Technologies office or sales representative. Refer to “Contacting Agilent Sales and Service Offices” on page...

  • Page 28: Statement Of Compliance

    Shipping Instructions You must always call the Agilent Technologies Instrument Support Center to initiate service before retuning your instrument to a service office. See “Contacting Agilent Sales and Service Offices”...

  • Page 29: General Safety Considerations

    E8257D Option HAR Safety and Regulatory Information General Safety Considerations Safety Earth Ground WARNING This is a Safety Class I product (provided with a protective earthing ground incorporated in the power cord). The mains plug shall only be inserted in a socket outlet provided with a protective earth contact.

  • Page 30: Servicing

    E8257D Option HAR Safety and Regulatory Information Servicing Warnings applicable to this instrument WARNING To prevent electrical shock, disconnect the Agilent Technologies E8257D Option HAR from the mains before cleaning. Use a dry cloth or one slightly dampened with water to clean the external case parts.

  • Page 31: Electrostatic Discharge Protection

    E8257D Option HAR Electrostatic Discharge Protection Electrostatic Discharge Protection Protection against electrostatic discharge (ESD) is essential while removing assemblies from or connecting cables to the network analyzer. Static electricity can build up on your body and can easily damage sensitive internal circuit elements when discharged. Static discharges too small to be felt can cause permanent damage.

  • Page 32: Regulatory Information

    E8257D Option HAR Regulatory Information Regulatory Information Instrument Markings The instruction documentation symbol. The product is marked with this symbol when it is necessary for the user to refer to the instructions in the documentation. This symbol indicates that the instrument requires alternating current (ac) input.

  • Page 33: Contacting Agilent Sales And Service Offices

    E8257D Option HAR Contacting Agilent Sales and Service Offices Contacting Agilent Sales and Service Offices Assistance with test and measurement needs, and information on finding a local Agilent office are available on the Internet at: http://www.agilent.com/find/assist You can also purchase accessories or documentation items on the Internet at: http://www.agilent.com/find...

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