Agilent Technologies N9914A, N9926A, N9918A, N9925A, N9915A Service Manual
...
Agilent Technologies
FieldFox MW VNA/SA
Service Guide
This manual provides documentation for the following instruments:
FieldFox MW Analyzers - N9913A, N9914A, N9915A, N9916A, N9917A, N9918A
FieldFox MW VNA - N9925A, N9926A, N9927A, N9928A
FieldFox MW SA - N9935A, N9936A, N9937A, N9938A
Ma
nufacturing Part Number: Part Number N9927-90003
Printed in USA
July 2014
Agilent Technologies, Inc. 2013 - 2014
Fieldfox Analyzer
Warranty Statement
THE MATERIAL CONTAINED IN THIS DOCUMENT IS PROVIDED “AS IS,” AND IS
SUBJECT TO BEING CHANGED, WITHOUT NOTICE, IN FUTURE EDITIONS. FURTHER,
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, AGILENT DISCLAIMS ALL
WARRANTIES, EITHER EXPRESS OR IMPLIED WITH REGARD TO THIS MANUAL AND
ANY INFORMATION CONTAINED HEREIN, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. AGILENT SHALL NOT BE LIABLE FOR ERRORS OR FOR INCIDENTAL
OR CONSEQUENTIAL DAMAGES IN CONNECTION WITH THE FURNISHING, USE, OR
PERFORMANCE OF THIS DOCUMENT OR ANY INFORMATION CONTAINED HEREIN.
SHOULD AGILENT AND THE USER HAVE A SEPARATE WRITTEN AGREEMENT WITH
WARRANTY TERMS COVERING THE MATERIAL IN THIS DOCUMENT THAT CONFLICT
WITH THESE TERMS, THE WARRANTY TERMS IN THE SEPARATE AGREEMENT WILL
CONTROL.
DFARS/Restricted Rights Notice
If software is for use in the performance of a U.S. Government prime contract or subcontract, Software is
delivered and licensed as “Commercial comp uter software” as defined in DFAR 252.227-7014 (June
1995), or as a “commercial item” as defined in FAR 2.101(a) or as “Restricted computer software” as
defined in FAR 52.227-19 (June 1987) or any equivalent agency regulation or contract clause. Use,
duplication or disclosure of Software is subject to Agilent Technologies’ standard commercial license
terms, and non-DOD Departments and Agencies of the U.S. Government will receive no greater than
Restricted Rights as defined in FAR 52.227-19(c)(1-2) (June 1987). U.S. Government users will receive
no greater than Limited Rights as defined in FAR 52.227-14 (June 1987) or DFAR 252.227-7015 (b)(2)
(November 1995), as applicable in any technical data.
Certification
Agilent Technologies, Inc. certifies that this product met its published specifications at the time of
shipment from the factory. Agilent Technologies, Inc. further certifies that its calibration measurements
are traceable to the United States National Institute of Standards and Technology, to the extent allowed
by the Institute's calibration facility, and to the calibration facilities of other International Standards
Organization members.
Title-2 N9927-90003
Fieldfox Analyzer
Assistance
Product maintenance agreements and other customer assistance agreements are ava ilable for Agilent
Technologies, Inc. products. For information about these agreements and for other assistance, contact
Agilent. Refer to “Contacting Agilent” on page 2-9.
Safety and Regulatory Information
The safety and regulatory information pertaining to this product is located in Chapter 1 , “Safety and
Regulatory Information.”
Safety Notes
The following safety notes are used throughout this manual. Familiarize yourself with each of the notes
and its meaning before operating this instrument. All pertinent safety notes for using this product are
located in Chapter 1 , “Safety and Regulatory Information.”
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. Do not proceed beyond
a warning note until the indicated conditions are fully understood and met.
CAUTION Caution denotes a hazard. It calls attention to a procedure that, if not correctly performed
or adhered to, could result in damage to or destruction of the instrument. Do not proceed
beyond a caution sign until the indicated conditions are fully understood and met.
Documentation Map
This Service Guide is available only on the Web via an Internet connection. It
contains information for testing, adjusting, troubleshooting, and repairing your
FieldFox analyzer.
N9927-90003 Title-3
Fieldfox Analyzer
The User’s Guide, included with the product, helps you to quickly familiarize yourself with the
analyzer. Procedures are provided for preparing, configuring, and making measurements with the
analyzer.
The Quick Reference Guide, included with the product, is an abbreviated form of the User’s Guide
containing some of the most commonly referred to information. The pages of the Quick Reference
Guide are laminated with clear plastic to resist damage when used outdoors.
Printing Copies of Documentation from the Web
To print copies of documentation from the Web, download the PDF file from the Agilent web site:
•Go to www.agilent.com.
• Enter the document’s part number (located on the title page) in the Search box.
• Click Search.
Title-4 N9927-90003
Contents
1 Safety and Regulatory Information
Information in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
General Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Safety Earth Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Before Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Electrostatic Discharge Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Regulatory Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Instrument Markings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Battery Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
2 General Product Information
Information in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Physical Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Electrical Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Analyzer Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Analyzer Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Option Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Agilent Support, Services, and Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Service and Support Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Calibration Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Contacting Agilent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Shipping Your Analyzer to Agilent for Service or Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
3 Tests and Adjustments
Information in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Protect Against Electrostatic Discharge (ESD). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Allow the Analyzer to Warm Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Review the Principles of Connector Care. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Service Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Before Returning an Instrument to a Customer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Operational Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Performance Tests (Agilent N7841A Software Package). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Performance Verification Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Adjustments (Agilent N7841A Software Package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
4 Troubleshooting
Information in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Protect Against Electrostatic Discharge (ESD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Assembly Replacement Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Getting Started with Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Check the Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Service Guide?N9927-90003 Contents-1
Contents
Troubleshooting Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
Power Up Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6
Front Panel Group Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Checking Display Brightness and Sound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Checking the Front Panel Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
USB and SD Card Slot Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
Measurement Group Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9
Problems in NA Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9
Problems in SA Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-11
5 Theory of Operation
Information in This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Analyzer System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3
Functional Groups of the Analyzer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3
Front Panel Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5
A3 Front Panel Interface Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5
A2 LCD Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6
Measurement Group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7
A4 RF Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7
A5 System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-13
A6 SOM Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-17
A7 Real Time Clock Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-17
Main Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-17
Grounding and Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-18
Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-18
Voltages and Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-18
Power Control and Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-19
Battery Related Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-20
Operation in Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-22
CAT, NA, and VVM Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-24
SA and CPM Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-24
Power Meter Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-25
Temperature Related Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-25
User Calibration in CAT, NA, and VVM Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-26
Factory Calibration (CalReady) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 2 6
QuickCal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-26
Mechanical Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-27
Firmware Related Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-28
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-28
User Accessible Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-28
Operational Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-28
Erase User Data Utility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-28
Error Log. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-29
Firmware Upgrades. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-29
LAN Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-30
6 Replaceable Parts
Information in This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
Contents-2 Service Guide?N9927-90003
Contents
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Assembly Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Replaceable Parts Listings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Entire Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Front Panel Group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Measurement Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Case Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
Miscellaneous Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
7 Repair and Replacement Procedures
Information in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Personal Safety Warnings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Safety Earth Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Electrostatic Discharge (ESD) Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Assembly Replacement Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
Removal and Replacement Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
Removing and Replacing the Main Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
Removing and Replacing the Case Group Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Removing and Replacing the Front Panel Group Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21
Removing and Replacing the Measurement Group Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27
Post-Repair Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-44
Manual Checks and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-45
8 General Purpose Maintenance and Service Procedures
Information in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Service Related User Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
To View Currently Installed Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
To View the Current Firmware Revision, Etc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
To View the Error Log. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
To View Temperature Readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Erase User Data Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
To View Currently Installed Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
Re-Installing Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
Firmware Upgrades. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
To Check the Current Firmware Revision. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
Miscellaneous Service and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
Cleaning the Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
Battery Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
Appendix A
FieldFox S-parameter Measurement Uncertainty, for System Verification . . . . . . . . . . . . . . . . . . . . . . . . A-2
Corrected measurement uncertainty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Corrected measurement uncertainty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Service Guide?N9927-90003 Contents-3
Contents
Contents-4 Service Guide?N9927-90003
1 Safety and Regulatory Information
N9927-90003 1-1
Safety and Regulatory Information FieldFox Analyzer
Information in This Chapter
Information in This Chapter
This chapter provides safety information that will help protect you and your network analyzer. It also
contains information that is required by various government regulatory agencies.
Section Title Summary of Content Start Page
Safety Symbols
General Safety Considerations
Electrostatic Discharge Protection
Regulatory Information
Descriptions of CAUTION and WARNING
symbols used throughout this manual.
A list of safety points to consider when servicing
your network analyzer.
A discussion of electrostatic discharge (ESD) and
related recommendations and requirements for ESD
protection.
Definitions of instrument markings.
Instructions for disposing of the analyzer’s lithium
battery.
Page 1-3
Page 1-3
Page 1-5
Page 1-6
1-2 N9927-90003
FieldFox Analyzer Safety and Regulatory Information
Safety Symbols
Safety Symbols
The following safety symbols are used throughout this manual. Familiarize yourself with each of the
symbols and its meaning before operating this instrument.
CAUTION Caution denotes a hazard. It calls attention to a procedure that, if not correctly performed
or adhered to, could result in damage to or destruction of the instrument. Do not proceed
beyond a caution note until the indicated conditions are fully understood and met.
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. Do not proceed beyond
a warning note until the indicated conditions are fully understood and met.
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. Any interruption of the protective
conductor, inside or outside of the instrument, will make the instrument dangerous.
Intentional interruption is prohibited.
CAUTION Always use the three-prong AC power cord supplied with this product. Failure to ensure
adequate grounding by not using this cord may cause produ ct damage.
N9927-90003
1-3
Safety and Regulatory Information FieldFox Analyzer
General Safety Considerations
Before Applying Power
WARNING If this product is not used as specified, the protection provided by the equipment
could be impaired. This product must be used in a normal condition (in which all
means for protection are intact) only.
CAUTION This product is designed for use in Installation Category II and Pollution Degree 2 per
IEC 61010-1:2001 and 664 respectively.
CAUTION The measuring terminals on this instrument are designed to be used with external signals
described in Measurement Category I, but NOT with external signals described in
Categories II, III, and IV. The input of this instrument cannot be connected to the mains.
Servicing
WARNING These servicing instructions are for use by qualified personnel only. To avoid
electrical shock, do not perform any servicing unless you are qualified to do so.
WARNING Danger of explosion if battery is incorrectly replaced. Replace only with the same or
equivalent type recommended. Discard used batteries according to local ordinances
and/or manufacturer’s instructions.
WARNING No operator serviceable parts inside. Refer servicing to qualified personnel. To
prevent electrical shock, do not remove covers.
WARNING For continued protection against fire hazard, replace line fuse only with same type
and rating. The use of other fuses or material is prohibited.
WARNING The detachable power cord is the instrument disconnecting device. It disconnects
the mains circuits from the mains supply before other parts of the instrument. The
front panel switch is only a standby switch and is not a LINE switch (disconnecting
device).
1-4 N9927-90003
FieldFox Analyzer Safety and Regulatory Information
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. To prevent damage to the instrument:
• always have a grounded, conductive table mat in front of your test equipment.
• always wear a grounded wrist strap, connected to a grounded conductive table mat, having a 1 MΩ
resistor in series with it, when handling components and assemblies or when making connections.
• always wear a heel strap when working in an area with a conductive floor. If you are uncertain about
the conductivity of your floor, wear a heel strap.
• always ground yourself before you clean, inspect, or make a connection to a static-sensitive device or
test port. You can, for example , gr asp the grounded outer shell of the test port or cable connector
briefly.
• always ground the center conductor of a test cable before making a connection to the analyzer test
port or other static-sensitive device. This can be done as follows:
1. Connect a short (from your calibration kit) to one end of the cable to short the center conductor to
the outer conductor.
2. While wearing a grounded wrist strap, grasp the outer shell of the cable connector.
3. Connect the other end of the cable to the test port and remove the short from the cable.
Figure 1-1 shows a typical ESD protection setup using a grounded mat and wrist strap. Refer to “ESD
Supplies” on page 6-14 for part numbers.
Figure 1-1 ESD Protection Setup
N9927-90003
1-5
Safety and Regulatory Information FieldFox Analyzer
ICES/NMB-001
Regulatory Information
Regulatory Information
This section contains information that is required by various government regulatory agencies.
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.
The CE mark is a registered trademark of the European Community. (If
accompanied by a year, it is when the design was proven.)
The CSA mark is a registered trademark of the Canadian Standards Association.
This is a marking to indicate product compliance with the Canadian
Interference-Causing Equipment Standard (ICES-001).
This is a symbol of an Industrial Scientific and Medical Group 1 Class A
product.
This is a required mark signifying compliance with an EMC requirement. The
C-Tick mark is a registered trademark of the Australian Spectrum Management
Agency.
This product complies with the WEEE Directive (2002/96/EC) marking requirements.
The affixed label indicates that you must not discard this electrical/ electronic product in
domestic household waste.
Product Category: With reference to the equipment types in the WEEE Directive Annex
I, this product is classed as a “Monitoring and Control instrumentation” product.
Do not dispose in domestic household waste.
To return unwanted products, contact your local Agilent office, or see
http://www.agilent.com/environment/product/ for more information.
1-6 N9927-90003
FieldFox Analyzer Safety and Regulatory Information
Regulatory Information
Battery Disposal
If the either the primary power battery, or the RTC (real time clock) battery (on the A3 front panel
interface board) needs to be disposed of, dispose of it in accordance with your country’s requirements. If
required, you may return the battery to Agilent Technologies for disposal. Refer to “Contacting Agilent”
on page 2-9 for assistance.
For instructions on removing and replacing the primary power battery, refer to “Removing and
Replacing the Main Battery” on page 7-6.
For instructions on removing and replacing the RTC (real time clock) battery located on the A3 front
panel interface board, refer to “Replacing the A3 Front Panel Interface Board (FPIB)” on page 7-25.
N9927-90003
1-7
Safety and Regulatory Information FieldFox Analyzer
Regulatory Information
1-8 N9927-90003
2 General Product Information
N9927-90003 2-1
General Product Information FieldFox Analyzer
Information in This Chapter
Information in This Chapter
Section Title Summary of Content Start Page
Cleaning instructions for the external surfaces of
Maintenance
your analyzer.
Page 2-2
Information about electrical maintenance of your
analyzer.
Analyzer Models
Analyzer Options
Agilent Support, Services, and
Assistance
A list of the models available for the microwave
network analyzers.
A list of the options available for the microwave
network analyzers.
The Internet address (URL) for Agilent assistance.
Service and support options available.
Calibration options available.
Important information about shipping your
analyzer to Agilent for service or repair.
Page 2-3
Page 2-4
Page 2-8
Maintenance
WARNING To prevent electrical shock, disconnect the analyzer from the mains source before
cleaning. Use a dry cloth or one slightly dampened with water to clean the external
case parts. Do not attempt to clean internally.
Physical Maintenance
Clean the analyzer case using a dry or slightly damp cloth only.
Electrical Maintenance
Refer to “Contacting Agilent” on page 2-9 and to Chapter 3 , “Tests and Adjustments.”
2-2 N9927-90003
FieldFox Analyzer General Product Information
Analyzer Models
Analyzer Models
Max Freq (GHz) N991x Combo N992x VNA N993x SA
4 N9913A X X
6.5 N9914A X X
9 N9915A N9925A N9935A
14 N9916A N9926A N9936A
18 N9917A N9927A N9937A
26.5 N9918A N9928A N9938A
N9927-90003 2-3
General Product Information FieldFox Analyzer
Analyzer Options
Analyzer Options
Below is a list of options that effect hardware for the FieldFox at the time of initial product release.
Additional options will be added as product features are enhanced. Go to
www.agilent.com/find/fieldfox2 for information on currently available upgrade options.
Table 2-1. Options
Option Description N991x Combo N992x VNA N993x SA
010 VNA Time Domain Available Available −
030 Remote Control Capability Available Available Available
100 3.5 mm APC Connectors -- -- N9938A
112 QuickCal Available Available −
210 VNA Transmission/Reflection Available
211 VNA Full 2-Port S-Parameters Available Available −
220 Tracking Generator See 210 − Available
233 Spectrum Analyzer Available −
235 Preamplifier Available − Available
236 Interference Analyzer and Spectrogram Available − Available
238 Spectrum Analyzer Time Gating Available − Available
302 USB Power Sensor Support Available Available Available
305 Cable and Antenna Analyzer Included in
Base
307 GPS Receiver Available Available Available
308 Vector Voltmeter Available Available −
309 DC Bias Variab le- Voltage Source Available Available Available
310 Built-In Power Meter Available Available Available
320 Reflection Measurements (RL, VSWR) Included in
Base
Base Model −
Base Model
Available −
− Available
2-4 N9927-90003
FieldFox Analyzer General Product Information
Analyzer Options
Option Descriptions
Option 010, Vector Network Analyzer Time Domain
With Option 010 or time domain, FieldFox computes the inverse Fourier transform of the
frequency-domain data to display reflection or transmission coefficients versus time. Time domain
gating can be used to remove unwanted responses such as connector mismatch or cable discontinuities,
and the results can be displayed in either time or frequency domain.
• Fully error-corrected time domain reflection or transmission response
• Gating available to remove unwanted responses
• View time and frequency domain data simultaneously
• Transform frequency domain to the time domain or time domain to the frequency domain
Option 030, Remote Control Capability
Option 030 adds remote control capability to FieldFox for iDevices.
• User must supply iPad, iPhone, or iPod.
• User must download free FieldFox app from App store.
Option 100, 3.5 mm APC Connectors
Option 100 provides 3.5 mm input and output connectors.
Available on N9938A model only (26.5 GHz) at initial purchase.
Option 112, QuickCal
Option 112 provides a calib ratio n th at is performed automatically using calibrati on standards that are
built-in to the FieldFox. Calibration standards are automatically switched in as needed. QuickCal is ideal
for making quick DTF and cable loss measurements without taking the time to perform a full O,S,L Cal.
Option 210, Vector Network Analyzer Transmission/Reflection
A base combination analyzer includes a cable and antenna analyzer.
Available on N9991x Combination models. Base option available for N9992x models only.
Option 210 adds:
• A vector network analyzer mode with transmission/reflection or S21 and S11 measurements, both
magnitude and phase. Available calibrations are CalReady, one-port OSL, response and enhanced
response.
• Insertion loss measurement to the base cable and antenna analyzer or CAT mode.
• 2-port transmission measurement to the vector voltmeter mode, available as Option 308.
• Tracking capability to the spectrum analyzer independent source, available as Option 233 (source and
spectrum analyzer set to sweep a frequency range, in sync)
N9927-90003 2-5
General Product Information FieldFox Analyzer
Analyzer Options
Option 211, Vector Network Analyzer Full 2-Port S Parameters
For the N991x Combination models of FireFox, Option 211 provides transmission/reflection or S21 and
S11 measurement capabilities, along with one-port and enhanced response calibrations. Additionally for
the N991x Combination models and the N992x VNA models, Option 211 provides all four S-parameters
- forward and reverse (S11, S21, S12, S22), and full 2-port calibration. Full 2-port cal ibration is the most
accurate calibration available with FieldFox network analyzers.
Option 211 also adds A/B and B/A measurement capabilities to the vector voltmeter mode, available as
Option 308.
• Adds reverse measurements to the VNA
• All four S-parameters (S21, S11, S12, S22), magnitude and phase
Option 220, Tracking Generator - Full Band
Option 220 allows you to easily make accurate scalar stimulus/response measurements on active and
passive components, cables, connectors and antennas. The full-band tracking generator source can also
be decoupled to act as a stand-alone source that can be used to stimulate an active or passive component,
optionally using the spectrum analyzer for measurement.
Option 233, Spectrum Analyzer
Option 233 adds a high performance, full-band spectrum analyzer including four traces, different
detector types, radio standard selection and flexible limit lines. The option offers channel power
measurements, AM/FM tune and listen, field strength measurements, antenna factors and frequency
counter markers. Also included is a full-band tracking generator.
Option 235, Preamplifier for Spectrum Analyzer
Option 235 increases the spectrum analyzer sensitivity, reducing the DANL to -155 dBm.
Option 233 is prerequisite.
Option 236, Interface Analyzer and Spectrogram
Option 236 provides quick and accurate identification of interfering signals using the spectrogram or
waterfall display. Record and playback allows signal capture and offline processing.
Option 233 is prerequisite.
Option 238, Spectrum Analyzer Time Gating
• Adds FFT.
• Gate sources: External, RF Burst, and Video.
• Option 233 is a prerequisite for Option 238
2-6 N9927-90003
FieldFox Analyzer General Product Information
Analyzer Options
Option 302, External USB Power Sensor Support
Option 302 allows the use of an external USB controllable power sensor.
All Agilent U2000x Series USB power sensors are supported with FieldFox.
Visit: www.agilent.com/find/u2000 for an up-to-date listing.
Option 305, Cable and Antenna Analyzer
Option 305 provides fast and accurate diagnosis of cables, connectors, and antennas with DTF (dB,
linear, VSWR), return loss and DTF, 1-port cable loss, 2-port insertion loss, and CalReady.
Option 307, GPS Receiver
Option 307 enables the built-in GPS receiver. Requires a GPS antenna such as N9910X-825.
Option 308, Vector Voltmeter (VVM)
Option 308 includes S11 or one-port cable trimming.
Option 309, DC Bias Variable-Voltage Source
Option 309 adds an integrated built-in variable voltage DC bias source to the FieldFox analyzer. The
source provides 1 to 32 VDC with maximum current of 650 mA and 7 watts maximum power. The DC
bias source can provide DC power to amplifiers under test and bias tower mounted amplifiers (TMA)
when engineers need to sweep through the TMA to reach the antenna. The bias-tee is available
separately. The DC output has an SMB (m) connector.
Option 310, Built-In Power Meter
Option 310 provides the functionality to make user-definable channel power measurements such as
transmitter output power. By leveraging InstAlign technology, FieldFox is able to make very accurate
channel power measurements.
Option 320, Reflection Measurements (Return Loss, VSWR, and Scalar Measurement)
Measurement of VSWR and return loss can be made on active and passive devices, cables, connectors
and antennas. Option 220 is prerequisite.
N9927-90003 2-7
General Product Information FieldFox Analyzer
Agilent Support, Services, and Assistance
Agilent Support, Services, and Assistance
Information on the following topics is included in this section.
• “Service and Support Options”
• “Calibration Options”
• “Contacting Agilent”
• “Shipping Your Analyzer to Agilent for Service or Repair”
Service and Support Options
The analyzer’s standard warranty is a one-year return to Agilent Technologies service warranty.
NOTE There are other repair and calibration options available from Agilent Technologies.
Contact Agilent for additional information on available service agreements for this
product. Refer to “Contacting Agilent” on page 2-9.
Calibration Options
Commercial Calibration Certificate with Test Data
A complete set of measurements that test the analyzer to the manufacturer’s published specifications. It
includes a calibration label, a calibration certificate, and the corresponding calibration data report. This
calibration conforms to ISO 9001.
ISO 17025 Standards Compliant Calibration
A complete set of measurements that test the analyzer to the manufacturer’s published specifications. It
includes a calibration label, an ISO 17025 calibration certificate, and the corresponding calibration data,
measurement uncertainties, and guardbands on all customer specifications. This calibration conforms to
ISO 17025 and ISO 9001.
This calibration option is available at the time of purchase or can be obtained later by sending your
analyzer to Agilent for calibration. Refer to “Shipping Your Analyzer to Agilent for Service or Repair”.
ANSI Z540 Standards Compliant Calibration
A complete set of measurements that test the analyzer to the manufacturer’s published specifications. It
includes both pre- and post-adjustment data with measurement uncertainty information compliant to the
ANSI/NCSL Z540 standard.
This calibration option is available at the time of purchase or can be obtained later by sending your
analyzer to Agilent for calibration. Refer to “Shipping Your Analyzer to Agilent for Service or Repair”.
2-8 N9927-90003
FieldFox Analyzer General Product Information
Agilent Support, Services, and Assistance
Contacting Agilent
Assistance with test and measurements needs and information on finding a local Agilent office are
available on the Web at:
http://www.agilent.com/find/assist
If you do not have access to the Internet, please contact your Agilent field engineer.
NOTE In any correspondence or telephone conversation, refer to the Agilent product by its
model number and full serial number. With this information, the Agilent representative
can determine whether your product is still within its warranty period.
Shipping Your Analyzer to Agilent for Service or Repair
IMPORTANTAgilent Technologies reserves the right to reformat or replace the internal flash drive in
your analyzer as part of its repair. This will erase all user information stored on the drive.
It is imperative, therefore, that you make a backup copy of your critical test data located
on the analyzer’s flash drive before shipping it to Agilent for repair.
If you wish to send your network analyzer to Agilent Technologies for service or repair:
• Include a complete description of the service requested or of the failure and a description of any
failed test and any error message.
• Ship the analyzer using the original or comparable antistatic packaging materials.
• Contact Agilent for instructions on where to ship your analyzer. Refer to “Contacting Agilent” on
page 2-9.
N9927-90003 2-9
General Product Information FieldFox Analyzer
Agilent Support, Services, and Assistance
2-10 N9927-90003
3 Tests and Adjustments
N9927-90003 3-1
Tests and Adjustments FieldFox Analyzer
Information in This Chapter
Information in This Chapter
This chapter contains procedures to help you check, verify, and adjust your FieldFox analyzer.
• The checks verify the operation of the assemblies in your analyzer.
• The adjustments allow you to tune your analyzer for maximum response.
NOTE The Agilent N7841A software package is required to test and adjust your analyzer. This
software package must be purchased separately. It can be downloaded from the Internet
and a license purchased on-line, or it can be ordered on a CD-ROM. Go to
www.agilent.com/find/calibrationsoftware for further information. The help file for the
N7841A software package is also available at this URL.
Section Title Summary of Content Start Page
Items to consider or procedures to perform before testing is
begun:
•
Verify the operating environment.
Before You Begin
Service Test Equipment
Before Returning an
Instrument to a Customer
Operational Check
Performance Tests
(Agilent N7841A
Software Package)
Adjustments (Agilent
N7841A Software
Package)
a
1. The Agilent N7841A software package must be purchased separately. Go to
www.agilent.com/find/calibrationsoftware for information.
1
• Protect Against Electrostatic Discharge (ESD)
• Allow the Analyzer to Warm Up
• Review the Principles of Connector Care
A list of additional equipment recommended for servicing the
FieldFox analyzer.
A list of things to do before returning an instrument to a
customer after servicing is completed.
An operation check that should be performed before returning
an instrument to a customer.
A list of performance tests included in the Agilent N7841A
software package.
A list of adjustments included in the Agilent N7841A software
package.
Page 3-3
Page 3-5
Page 3-6
Page 3-7
Page 3-9
Page 3-10
3-2 N9927-90003
FieldFox Analyzer Tests and Adjustments
Before You Begin
Before You Begin
Before checking, verifying, or adjusting the analyzer, refer to the following paragraphs to:
• Make sure the operating environment is within 19 to 27 °C and 5 to 95% humidity.
• Make sure that proper electrostatic discharge (ESD) protection is provided.
• Review the principles of connector care.
Protect Against Electrostatic Discharge (ESD)
This is important. If not properly protected against, electrostatic discharge can seriously damage your
analyzer, resulting in costly repair.
CAUTION To reduce the chance of electrostatic discharge, follow all of the recommendations
outlined in “Electrostatic Discharge Protection” on page 1-5, for all of the procedures in
this chapter.
Allow the Analyzer to Warm Up
Before testing or adjusting the FieldFox analyzer, allow it to warm up as described under “DUT
Warmup” in the “Getting Started” section of the N7841A help file.
N9927-90003 3-3
Tests and Adjustments FieldFox Analyzer
Before You Begin
Review the Principles of Connector Care
Proper connector care and connection techniques are critical for accurate and repeatable measurements.
Refer to Table 3-1 for tips on connector care.
Prior to making connections to your analyzer, carefully review the information about inspecting,
cleaning, and gaging connectors. Refer to the calibration kit documentation for detailed connector care
information.
For course numbers about additional connector care instruction, contact Agilent Technologies. Refer to
“Contacting Agilent” on page 2-9.
Table 3-1Connector Care Quick Reference Guide
Handling and Storage
Do • Keep connectors clean Do Not • Touch mating-plane surfaces
• Extend sleeve or connector nut • Set connectors contact-end down
• Use plastic end-caps during storage • Store connectors or adapters loose
Visual Inspection
Do • Inspect all connectors carefully Do Not • Use a damaged connector - ever
• Look for metal particles, scratches, and
dents
Connector Cleaning
Do • Try compressed air first Do Not • Use any abrasives
• Use isopropyl alcohol
• Clean connector threads
Do • Clean and zero the gage before use Do Not • Use an out-of-specification connector
• Use the correct gage type
• Use correct end of calibration block
• Gage all connectors before first use
Do • Align connectors carefully Do Not • Apply bending force to connection
• Make preliminary connection contact
lightly
• Turn only the connector nut • Twist or screw any connection
• Use a torque wrench for final connection • Tighten past torque wrench “break”
1. Cleaning connectors with alcohol shall only be done with the instrument’s power cord removed, and in
a well-ventilated area. Allow all residual alcohol moisture to evaporate, and the fumes to dissipate prior
to energizing the instrument.
1
Gaging Connectors
Making Connections
• Get liquid into plastic support beads
• Over tighten preliminary connection
point
3-4 N9927-90003
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