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Agilent 4396B Network/Spectrum/Impedance Analyzer
Service Manual
SERIAL NUMBERS
This manual applies directly to instruments with serial
number pre x JP1KD, or rmware revision 1.00.
For additional important information about serial
numbers, read \Serial Number" in Appendix A.
Agilent Part No. 04396-90121
Printed in Japan March 2001
Third Edition
Notice
The information contained in this document is subject to change without notice.
This document contains proprietary information that is protected by copyright. All rights are
reserved. No part of this document may be photocopied, reproduced, or translated to another
language without the prior written consent of the Agilent Technologies.
Agilent Technologies Japan, Ltd.
Component Test PGU-Kobe
1-3-2, Murotani, Nishi-ku, Kobe-shi,
Hyogo, 651-2241 Japan
Copyright Agilent Technologies Japan, Ltd.
c 1997, 2000, 2001
Manual Printing History
The manual's printing date and part number indicate its current edition. The printing date
changes when a new edition is printed. (Minor corrections and updates that are incorporated
at reprint do not cause the date to change.) The manual part number changes when extensive
technical changes are incorporated.
May 1997 : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : First Edition (part number: 04396-90121)
June 2000 : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : Second Edition (part number: 04396-90121)
March 2001 : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : Third Edition (part number: 04396-90121)
iii
Safety Summary
The following general safety precautions must be observed during all phases of operation,
service, and repair of this instrument. Failure to comply with these precautions or with speci c
WARNINGS elsewhere in this manual may impair the protection provided by the equipment.
In addition it violates safety standards of design, manufacture, and intended use of the
instrument.
The Agilent Technologies assumes no liability for the customer's failure to comply with these
requirements.
Note 4396B comply with INSTALLATION CATEGORY II and POLLUTION DEGREE 2
in IEC1010-1. 4396B are INDOOR USE product.
Note LEDs in 4396B are Class 1 in accordance with IEC825-1.
CLASS 1 LED PRODUCT
Ground The Instrument
To avoid electric shock hazard, the instrument chassis and cabinet must be connected to a
safety earth ground by the supplied power cable with earth blade.
DO NOT Operate In An Explosive Atmosphere
Do not operate the instrument in the presence of
ammable gasses or fumes. Operation of any
electrical instrument in such an environment constitutes a de nite safety hazard.
Keep Away From Live Circuits
Operating personnel must not remove instrument covers. Component replacement and internal
adjustments must be made by quali ed maintenance personnel. Do not replace components
with the power cable connected. Under certain conditions, dangerous voltages may exist even
with the power cable removed. To avoid injuries, always disconnect power and discharge
circuits before touching them.
DO NOT Service Or Adjust Alone
Do not attempt internal service or adjustment unless another person, capable of rendering rst
aid and resuscitation, is present.
DO NOT Substitute Parts Or Modify Instrument
Because of the danger of introducing additional hazards, do not install substitute parts or
perform unauthorized modi cations to the instrument. Return the instrument to a Agilent
Technologies Sales and Service Oce for service and repair to ensure that safety features are
maintained.
iv
Dangerous Procedure Warnings
Warnings , such as the example below, precede potentially dangerous procedures throughout
this manual. Instructions contained in the warnings must be followed.
Warning Dangerous voltages, capable of causing death, are present in this
instrument. Use extreme caution when handling, testing, and adjusting
this instrument.
Safety Symbols
General de nitions of safety symbols used on equipment or in manuals are listed below.
Instruction manual symbol: the product is marked with this symbol when it is
necessary for the user to refer to the instruction manual.
Alternating current.
Direct current.
On (Supply).
O (Supply).
In position of push-button switch.
Out position of push-button switch.
Frame (or chassis) terminal. A connection to the frame (chassis) of the
equipment which normally include all exposed metal structures.
This Warning sign denotes a hazard. It calls attention to a procedure, practice,
condition or the like, which, if not correctly performed or adhered to, could
result in injury or death to personnel.
This Caution sign denotes a hazard. It calls attention to a procedure, practice,
condition or the like, which, if not correctly performed or adhered to, could
result in damage to or destruction of part or all of the product.
This Note sigh denotes important information. It calls attention to a
procedure, practice, condition or the like, which is essential to highlight.
Axed to product containing static sensitive devices use anti-static handling
procedures to prevent electrostatic discharge damage to component.
v
Certi cation
Agilent Technologies certi es that this product met its published speci cations at the time
of shipment from the factory. Agilent Technologies further certi es that its calibration
measurements are traceable to the United States National Institute of Standards and
Technology, to the extent allowed by the Institution's calibration facility, or to the calibration
facilities of other International Standards Organization members.
Warranty
This Agilent Technologies instrument product is warranted against defects in material and
workmanship for a period of one year from the date of shipment, except that in the case of
certain components listed in General Information of this manual, the warranty shall be for the
speci ed period. During the warranty period, Agilent Technologies will, at its option, either
repair or replace products that prove to be defective.
For warranty service or repair, this product must be returned to a service facility designated by
Agilent Technologies. Buyer shall prepay shipping charges to Agilent Technologies and Agilent
Technologies shall pay shipping charges to return the product to Buyer. However, Buyer shall
pay all shipping charges, duties, and taxes for products returned to Agilent Technologies from
another country.
Agilent Technologies warrants that its software and rmware designated by Agilent
Technologies for use with an instrument will execute its programming instruction when
property installed on that instrument. Agilent Technologies does not warrant that the operation
of the instrument, or software, or rmware will be uninterrupted or error free.
Limitation Of Warranty
The foregoing warranty shall not apply to defects resulting from improper or inadequate
maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modi cation or
misuse, operation outside the environmental speci cations for the product, or improper site
preparation or maintenance.
No other warranty is expressed or implied. Agilent Technologies speci cally disclaims the
implied warranties of merchantability and tness for a particular purpose.
vi
Exclusive Remedies
The remedies provided herein are buyer's sole and exclusive remedies. Agilent Technologies
shall not be liable for any direct, indirect, special, incidental, or consequential damages,
whether based on contract, tort, or any other legal theory.
Assistance
Product maintenance agreements and other customer assistance agreements are available for
Agilent Technologies products.
For any assistance, contact your nearest Agilent Technologies Sales and Service Oce.
Addresses are provided at the back of this manual.
vii
Typeface Conventions
Bold Boldface type is used when a term is de ned. For example: icons are
symbols.
Italics Italic type is used for emphasis and for titles of manuals and other
publications.
Italic type is also used for keyboard entries when a name or a variable
must be typed in place of the words in italics. For example: copy
lename means to type the word copy, to type a space, and then to
type the name of a le such as file1.
Computer Computer font is used for on-screen prompts and messages.
4HARDKEYS5 Labeled keys on the instrument front panel are enclosed in 4 5.
NNNNNNNNNNNNNNNNNNNNNNNNNN NNNNN
SOFTKEYS Softkeys located to the right of the CRT are enclosed in .
viii
Documentation Map
The following manuals are available for the analyzer.
User's Guide
The User's Guide walks you through system setup and initial power-on, shows how to
make basic measurements, explains commonly used features, and typical application
measurement examples. After you receive your analyzer, begin with this manual.
Task Reference
Task Reference helps you to learn how to use the analyzer. This manual provides simple
step-by-step instructions without concepts.
Function Reference
The Function Reference describes all function accessed from the front panel keys and
softkeys. It also provides information on options and accessories available, speci cations,
system performance, and some topics about the analyzer's features.
Programming Guide
The Programming Guide shows how to write and use BASIC program to control the
analyzer and describes how HP Instrument BASIC works with the analyzer..
GPIB Command Reference
The GPIB Command Reference provides a summary of all available GPIB commands. It
also provides information on the status reporting structure and the trigger system (these
features conform to the SCPI standard).
HP Instrument BASIC Manual Set,
The HP Instrument BASIC User's Handbook introduces you to the HP Instrument BASIC
programming language, provide some helpful hints on getting the most use from it, and
provide a general programming reference. It is divided into three books, HP Instrument
BASIC Programming Techniques, HP Instrument BASIC Interface Techniques, and HP
Instrument BASIC Language Reference.
Performance Test Manual
The Performance Test Manual explains how to verify conformance to published
speci cations.
Service Manual (Option 0BW only),
The Service Manual explains how to adjust, troubleshoot, and repair the instrument.
This manual is option 0BW only.
ix
Contents
1. General Information
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
ORGANIZATION OF SERVICE MANUAL . . . . . . . . . . . . . . . . . . . . 1-1
TABLE OF SERVICE TEST EQUIPMENT . . . . . . . . . . . . . . . . . . . . 1-3
2. Adjustments and Correction Constants
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Warm-up for Adjustments and Correction Constants . . . . . . . . . . . . . . 2-2
Instrument Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Order Of Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Updating Correction Constants using the Adjustments Program . . . . . . . . . 2-3
Adjustments Program . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Keyboard and Mouse Operation . . . . . . . . . . . . . . . . . . . . . . 2-3
Controller Requirement . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Updating Correction Constants . . . . . . . . . . . . . . . . . . . . . . . 2-5
40 MHz Reference Oscillator Frequency Adjustment . . . . . . . . . . . . . . 2-6
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
520 MHz Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
CAL OUT Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Comb Generator Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Step Pretune Correction Constants . . . . . . . . . . . . . . . . . . . . . . 2-15
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Second Local PLL Lock Adjustment . . . . . . . . . . . . . . . . . . . . . . 2-16
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
DC Oset and Hold Step Adjustment . . . . . . . . . . . . . . . . . . . . . 2-18
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
0 /90 Tracking Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Band Pass Filters Adjustments . . . . . . . . . . . . . . . . . . . . . . . . 2-26
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
3 MHz Band Pass Filter Adjustment . . . . . . . . . . . . . . . . . . . . 2-26
1 MHz BPF Band Width Adjustment . . . . . . . . . . . . . . . . . . . . 2-27
Contents-1
Final Gain Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
Source Mixer Local Leakage Adjustment . . . . . . . . . . . . . . . . . . . 2-31
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31
RF OUT Level Correction Constants . . . . . . . . . . . . . . . . . . . . . . 2-33
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33
Spectrum Analyzer Absolute Magnitude Correction Constants . . . . . . . . . 2-34
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34
Network Analyzer Absolute Magnitude Correction Constants . . . . . . . . . . 2-35
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35
Crystal Filter Correction Constants . . . . . . . . . . . . . . . . . . . . . . 2-36
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36
IF Gain Errors Correction Constants . . . . . . . . . . . . . . . . . . . . . 2-37
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37
Network Analyzer Magnitude Ratio/Phase Correction Constants . . . . . . . . 2-39
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39
10 MHz Reference Oscillator Frequency Adjustment (Option 1D5 Only) . . . . . 2-41
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41
3. Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
TROUBLESHOOTING SUMMARY . . . . . . . . . . . . . . . . . . . . . . . 3-1
START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
INSPECT THE POWER ON SEQUENCE . . . . . . . . . . . . . . . . . . . . 3-4
Check the Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Check the Front Panel LEDs and Displays . . . . . . . . . . . . . . . . . . 3-4
Check Error Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
OPERATOR'S CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
INSPECT THE REAR PANEL FEATURE . . . . . . . . . . . . . . . . . . . . 3-9
Check the GPIB Interface . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Check the Parallel Interface . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Check the mini DIN Keyboard Connector . . . . . . . . . . . . . . . . . . 3-9
4. Isolate Faulty Group Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
OPERATOR'S CHECK FAILURE TROUBLESHOOTING . . . . . . . . . . . . . 4-2
Check RF OUT Frequency . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Check RF OUT Power Level . . . . . . . . . . . . . . . . . . . . . . . . 4-2
PERFORMANCE TESTS FAILURE TROUBLESHOOTING . . . . . . . . . . . . 4-3
Perform Adjustments and Correction Constants . . . . . . . . . . . . . . . 4-3
Troubleshoot Suspicious Functional Group . . . . . . . . . . . . . . . . . . 4-4
Contents-2
5. Power Supply Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
1. Check Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
2. Check the Fan is Rotating . . . . . . . . . . . . . . . . . . . . . . . . 5-3
3. Check the A50 SHUTDOWN LED . . . . . . . . . . . . . . . . . . . . . 5-3
A50 Shutdown LED . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
4. Check the A1 +5 VD LED . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Measure the A1 +5 VD Voltage . . . . . . . . . . . . . . . . . . . . . . 5-5
5. Check the A2 Eight LEDs . . . . . . . . . . . . . . . . . . . . . . . . 5-5
6. Run the Internal Test 4: A2 POST REGULATOR . . . . . . . . . . . . . . 5-6
Internal Test 4: A2 POST REGULATOR . . . . . . . . . . . . . . . . . . 5-7
FIND OUT WHY THE FAN IS NOT ROTATING . . . . . . . . . . . . . . . . . 5-8
1. Check the Line Voltage, Selector Switch Setting, and Fuse . . . . . . . . . 5-8
2. Check the A50 SHUTDOWN LED . . . . . . . . . . . . . . . . . . . . . 5-8
FIND OUT WHY THE A50 SHUTDOWN LED IS OFF . . . . . . . . . . . . . . 5-9
1. Disconnect the Cable from the A50J1 . . . . . . . . . . . . . . . . . . 5-9
2. Disconnect the Cable from the A51J2 . . . . . . . . . . . . . . . . . . 5-9
3. Disconnect the Cable from the A1J10 . . . . . . . . . . . . . . . . . . 5-9
4. Remove Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
FIND OUT WHY THE A1 +5 VD LED IS NOT ON STEADILY . . . . . . . . . . 5-10
1. Check the A40 Pre-Regulator . . . . . . . . . . . . . . . . . . . . . . 5-10
2. Check the A50 DC-DC Converter . . . . . . . . . . . . . . . . . . . . . 5-10
3. Disconnect Cables on the A1 CPU . . . . . . . . . . . . . . . . . . . . 5-11
4. Remove Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
TROUBLESHOOT THE FAN AND THE A50 DC-DC CONVERTER . . . . . . . . 5-13
1. Troubleshoot the Fan . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
2. Troubleshoot the A50 DC-DC Converter . . . . . . . . . . . . . . . . . 5-14
TROUBLESHOOT THE A2 POST-REGULATOR . . . . . . . . . . . . . . . . . 5-16
1. Check the A40 Pre-Regulator . . . . . . . . . . . . . . . . . . . . . . 5-16
2. Check the A50 DC-DC Converter . . . . . . . . . . . . . . . . . . . . . 5-16
3. Remove Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
4. Measure the A2 Post Regulator Output Voltages . . . . . . . . . . . . . . 5-16
6. Digital Control Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
A1 CPU Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
FIRMWARE INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Ordering the Firmware Diskette . . . . . . . . . . . . . . . . . . . . . . 6-4
Installing the Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
1. Check the Power On Sequence . . . . . . . . . . . . . . . . . . . . . . 6-6
Check the 4Ch 15 and 4Ch 25 Operations . . . . . . . . . . . . . . . . . . . 6-6
Check the A1 Eight LEDs . . . . . . . . . . . . . . . . . . . . . . . . 6-6
2. Check Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Check the Power On Selftest . . . . . . . . . . . . . . . . . . . . . . . 6-7
3. Check the A1 DRAM and Flash Memory . . . . . . . . . . . . . . . . . 6-10
4. Check the A1 Volatile Memory . . . . . . . . . . . . . . . . . . . . . . 6-11
5. Check the A30 Front Keyboard . . . . . . . . . . . . . . . . . . . . . 6-11
6. Check the A53 FDD . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
7. Check the A32 I-BASIC Interface and the mini DIN Keyboard . . . . . . . 6-12
TROUBLESHOOT THE A51 GSP and A52 LCD . . . . . . . . . . . . . . . . . 6-13
1. Run the Internal Test 3: A51 GSP . . . . . . . . . . . . . . . . . . . . 6-13
2. Check the A52 LCD(Liquid Crystal Display) . . . . . . . . . . . . . . . . 6-13
Contents-3
7. Source Group Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
SOURCE GROUP TROUBLESHOOTING SUMMARY . . . . . . . . . . . . . . . 7-3
Start Here . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Check A5 Synthesizer Outputs . . . . . . . . . . . . . . . . . . . . . . . 7-3
Check A4A1 1st LO Outputs . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Check an A3A1 ALC Output . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Check A3A2 2nd LO Outputs . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Check an A3A3 Source Output . . . . . . . . . . . . . . . . . . . . . . . 7-4
Check A7 Output Attenuator Control Signals . . . . . . . . . . . . . . . . 7-4
Check A60 High Stability Frequency Reference (Option 1D5) . . . . . . . . . 7-4
START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
CHECK A5 SYNTHESIZER OUTPUTS . . . . . . . . . . . . . . . . . . . . . 7-7
1. Check the CAL OUT Signal . . . . . . . . . . . . . . . . . . . . . . . 7-7
Check the CAL OUT's Spurious . . . . . . . . . . . . . . . . . . . . . . 7-8
2. Check the INT REF Signal . . . . . . . . . . . . . . . . . . . . . . . . 7-9
3. Check the FRAC N OSC Signal . . . . . . . . . . . . . . . . . . . . . . 7-11
4. Check the STEP OSC Signal . . . . . . . . . . . . . . . . . . . . . . . 7-13
5. Check the 520 MHz Signal . . . . . . . . . . . . . . . . . . . . . . . . 7-16
6. Check the EXT REF Operation . . . . . . . . . . . . . . . . . . . . . . 7-18
CHECK A4A1 1ST LO OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . 7-19
1. Check the 1st LO OSC Signal at A4A1J3 . . . . . . . . . . . . . . . . . 7-19
2. Check the 1st LO OSC Signal at A4A1J4 . . . . . . . . . . . . . . . . . 7-21
CHECK AN A3A1 ALC OUTPUT . . . . . . . . . . . . . . . . . . . . . . . 7-23
1. Check the 21.42 MHz Signal . . . . . . . . . . . . . . . . . . . . . . . 7-23
CHECK A3A2 2ND LO OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . 7-26
1. Check the 2nd Local Oscillator Signal . . . . . . . . . . . . . . . . . . 7-26
2. Check the 2.05858 GHz Signal . . . . . . . . . . . . . . . . . . . . . . 7-27
CHECK AN A3A3 SOURCE OUTPUT . . . . . . . . . . . . . . . . . . . . . 7-30
1. Check the A3A3 RF Signal . . . . . . . . . . . . . . . . . . . . . . . . 7-30
CHECK A7 OUTPUT ATTENUATOR CONTROL SIGNALS . . . . . . . . . . . . 7-32
1. Check A7 Control Signals . . . . . . . . . . . . . . . . . . . . . . . . 7-32
CHECK THE A60 HIGH STABILITY FREQUENCY REFERENCE . . . . . . . . . 7-34
8. Receiver Group Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
RECEIVER GROUP TROUBLESHOOTING SUMMARY . . . . . . . . . . . . . . 8-3
Start Here . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Check A8 Output Attenuator Control Signals . . . . . . . . . . . . . . . . 8-3
Check A9 Input Multiplexer Control Signals . . . . . . . . . . . . . . . . . 8-3
Check Signal Inputs to A4A2 Receiver RF . . . . . . . . . . . . . . . . . . 8-3
START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
CHECK A8 INPUT ATTENUATOR CONTROL SIGNALS . . . . . . . . . . . . . 8-5
CHECK A9 INPUT MULTIPLEXER CONTROL SIGNALS . . . . . . . . . . . . . 8-7
CHECK SIGNAL INPUTS TO THE A4A2 RECEIVER RF . . . . . . . . . . . . . 8-9
Check the Input Signal to A4A2J3 . . . . . . . . . . . . . . . . . . . . . 8-9
Check the Input Signal to A4A2J12 . . . . . . . . . . . . . . . . . . . . . 8-9
Contents-4
9. Accessories Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
VERIFY OPERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
Using 75
Connectors with 50
Connectors . . . . . . . . . . . . . . . . 9-2
Large Spurious Signals in the Spectrum Measurement . . . . . . . . . . . . 9-2
Odd Appearing Opens and Shorts in the Network Measurement . . . . . . . . 9-2
INSPECT THE CONNECTORS . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
INSPECT THE ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . 9-4
Verify the Probe Power . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4
Inspect the Test Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
Inspect the Calibration Kit . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
Verify Shorts and Opens . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
10. Service Key Menus
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
SERVICE MENU . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNN
. . . . . . . . . . . . . . . . 10-3
TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-3
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE MODES (:DIAG:SERV:MODE {ON|1}) . . . . . . . . . . . . . . . . 10-3
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FIRMWARE REVISION (:DIAG:FREV?) . . . . . . . . . . . . . . . . . . . . 10-3
TESTS MENU . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . . . . . 10-4
EXECUTE TEST (:DIAG:TEST:EXET) . . . . . . . . . . . . . . . . . . . . . 10-4
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
INTERNAL TESTS (:DIAG:TEST 0) . . . . . . . . . . . . . . . . . . . . . 10-4
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
EXTERNAL TESTS (:DIAG:TEST 17) . . . . . . . . . . . . . . . . . . . . . 10-5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ADJUSTMENT TESTS (:DIAG:TEST 41) . . . . . . . . . . . . . . . . . . . . 10-5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DISPLAY TESTS (:DIAG:TEST 48) . . . . . . . . . . . . . . . . . . . . . 10-5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ALL EXT TESTS (:DIAG:TEST 53) . . . . . . . . . . . . . . . . . . . . . 10-5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MISC TESTS (:DIAG:TEST 58) . . . . . . . . . . . . . . . . . . . . . . . 10-5
Test Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-5
Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6
Test Descriptions . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . . . . . 10-7
INTERNAL TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7
0: ALL INT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7
1: A1 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7
2: A1 VOLATILE MEMORY . . . . . . . . . . . . . . . . . . . . . . . . 10-7
3: A51 GSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8
4: A2 POST REGULATOR . . . . . . . . . . . . . . . . . . . . . . . . 10-8
5: A6 A/D CONVERTER . . . . . . . . . . . . . . . . . . . . . . . . . 10-8
6: A5 REFERENCE OSC . . . . . . . . . . . . . . . . . . . . . . . . . 10-8
7: A5 FRACTIONAL N OSC . . . . . . . . . . . . . . . . . . . . . . . . 10-8
8: A5 STEP OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
9: A4A1 1ST LO OSC . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
10: A3A2 2ND LO OSC . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
11: A3A1 DIVIDER . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
12: A6 3RD LO OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
13: A3A1 SOURCE OSC . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
14: A6 3RD IF DC OFFSET . . . . . . . . . . . . . . . . . . . . . . . . 10-9
15: A6 SEQUENCER . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
16: A3A1 ALC . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . . . . . 10-9
EXTERNAL TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
17: FRONT PANEL DIAG. . . . . . . . . . . . . . . . . . . . . . . . . 10-12
18: DSK DR FAULT ISOL'N . . . . . . . . . . . . . . . . . . . . . . . . 10-12
19: POWER SWEEP LINEARITY . . . . . . . . . . . . . . . . . . . . . 10-12
Contents-5
20: OUTPUT ATTENUATOR . . . . . . . . . . . . . . . . . . . . . . . 10-12
21: INPUT ATTENUATOR . . . . . . . . . . . . . . . . . . . . . . . . 10-13
22: RF TO S LVL & FLTNESS . . . . . . . . . . . . . . . . . . . . . . . 10-13
23: S TO A CROSSTALK . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
24: S INPUT COMPRESSION . . . . . . . . . . . . . . . . . . . . . . . 10-13
25: S INPUT RESIDUALS . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
26: S INPUT NOISE LEVEL . . . . . . . . . . . . . . . . . . . . . . . 10-13
27: FRACTION SPURIOUS . . . . . . . . . . . . . . . . . . . . . . . . 10-13
28: RF TO R LVL & FLTNESS . . . . . . . . . . . . . . . . . . . . . . . 10-14
29: NA CROSSTALK & NOISE . . . . . . . . . . . . . . . . . . . . . . 10-14
30: R INPUT COMPRESSION . . . . . . . . . . . . . . . . . . . . . . . 10-14
31: RANGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14
32: A/R RATIO ACCURACY . . . . . . . . . . . . . . . . . . . . . . . . 10-14
33: A INPUT COMPRESSION . . . . . . . . . . . . . . . . . . . . . . . 10-14
34: B/R RATIO ACCURACY . . . . . . . . . . . . . . . . . . . . . . . . 10-15
35: B INPUT COMPRESSION . . . . . . . . . . . . . . . . . . . . . . . 10-15
36: RESOLUTION BANDWIDTH . . . . . . . . . . . . . . . . . . . . . 10-15
37: IF GAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
38: PHASE NOISE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
39: SPURIOUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
40: X'TAL FILTER RESPONSE . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . 10-15
ADJUSTMENT TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16
41: DC OFFST/HLD STEP ADJ . . . . . . . . . . . . . . . . . . . . . . 10-16
42: 0/90 DEG TRACKING ADJ . . . . . . . . . . . . . . . . . . . . . . 10-16
43: FINAL GAIN ADJ . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16
44: 2nd LO PLL LOCK ADJ . . . . . . . . . . . . . . . . . . . . . . . 10-16
45: SOURCE MIXER LEAK ADJ . . . . . . . . . . . . . . . . . . . . . 10-16
46: 3 MHZ BPF ADJ . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16
47: 1 MHZ BPF ADJ . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . 10-16
DISPLAY TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16
48: TEST PATTERN 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16
49: TEST PATTERN 2 . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17
50: TEST PATTERN 3 . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17
51: TEST PATTERN 4 . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17
52: TEST PATTERN 5 . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . 10-17
ALL EXT TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17
53: ALL EXT 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17
54: ALL EXT 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17
55: ALL EXT 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17
56: ALL EXT 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17
57: ALL EXT 5 . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . 10-17
MISC TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
58: IMPEDANCE TEST KIT . . . . . . . . . . . . . . . . . . . . . . . . 10-18
SERVICE MODES MENU . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . 10-19
BUS MEAS [OFF] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CORRECTION CONSTANTS . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
NNNNNNNN
IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
NNNNNNNNNNNNNNNNN
SYNTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
NNNNNNNNNNNNNNNNNNNN
SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
Service Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
BUS MEASUREMENT MENU . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . 10-21
BUS MEAS on OFF (:DIAG:SERV:BUS:STAT {ON|OFF}) . . . . . . . . . . . . 10-21
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DC BUS [OFF] (:DIAG:SERV:BUS:DC ) . . . . . . . . . . . . . 10-21
Contents-6
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FREQ BUS [OFF] (:DIAG:SERV:BUS:FREQ ) . . . . . . . . . . . 10-21
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
AZ SWITCH on OFF (:DIAG:SERV:BUS:AZER {OFF|ON|0|1}) . . . . . . . . . 10-22
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
WAIT COUNT (:DIAG:SERV:BUS:WAIT . . . . . . . . . . . . . . . . . . . . 10-22
Bus Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-22
Bus Measurement Procedure . . . . . . . . . . . . . . . . . . . . . . . . 10-22
Bus Measurement Values . . . . . . . . . . . . . . . . . . . . . . . . . . 10-23
DC Bus Node Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . 10-23
0: NONE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-23
1: +5 V (AUX) (2.025 U) . . . . . . . . . . . . . . . . . . . . . . . . . 10-23
2: 015 V (01.92 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-23
3: 012.6 V (02.124 U) . . . . . . . . . . . . . . . . . . . . . . . . . . 10-23
4: 05 V (02.025 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
5: +5 V (2.025 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
6: +5.3 V (2.1465 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
7: +8.5 V (1.8955 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
8: +15 V (AUX) (1.92 U) . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
9: +15 V (1.92 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
10: +22 V (2.002 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
11: FAN POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
12: +65 V (2.0605 U) . . . . . . . . . . . . . . . . . . . . . . . . . . 10-25
13: SRC VTUNE (Source Oscillator VCO Tuning Voltage) . . . . . . . . . . 10-25
14: 2ND LO VTUNE (Second Local Oscillator VCO Tuning Voltage) . . . . . 10-25
15: DET OUT (Detector Output) . . . . . . . . . . . . . . . . . . . . . 10-25
16: LVL CONT (Level Vernier Control Voltage) . . . . . . . . . . . . . . . 10-26
17: DAC OUT (Level DAC Output Voltage) . . . . . . . . . . . . . . . . . 10-26
18: 1ST LO VTUNE (First Local Oscillator VCO Turning Voltage) . . . . . . 10-26
19: STEP VTUNE (Step Oscillator VCO Turning Voltage) . . . . . . . . . . 10-27
20: FN VTUNE (Fractional N Oscillator VCO Turning Voltage) . . . . . . . 10-27
21: FN INTEG OUT (Fractional N Oscillator Integrator Output Voltage) . . . 10-28
22: REF VTUNE (Reference Oscillator VCO Tuning Voltage) . . . . . . . . 10-29
23: 3RD LO VTUNE (Third Local Oscillator VCO Tuning Voltage) . . . . . . 10-29
24: 2ND IF LVL (Second IF Signal Level) . . . . . . . . . . . . . . . . . 10-29
25: AD VREF (A/D Converter Voltage Reference) . . . . . . . . . . . . . 10-29
26: GND (Ground) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-30
Frequency Bus Node Descriptions . . . . . . . . . . . . . . . . . . . . . . 10-30
0: OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-30
1: SOURCE OSC (Source Oscillator) . . . . . . . . . . . . . . . . . . . . 10-30
2: DIVIDER OUT (Divider Output) . . . . . . . . . . . . . . . . . . . . 10-30
3: STEP OSC (Step Oscillator) . . . . . . . . . . . . . . . . . . . . . . 10-30
4: FN OSC (Fractional N Oscillator) . . . . . . . . . . . . . . . . . . . . 10-30
5: REF OSC (Reference Oscillator) . . . . . . . . . . . . . . . . . . . . 10-31
6: 3RD LO OSC (Third Local Oscillator) . . . . . . . . . . . . . . . . . . 10-31
7: SAMPLE HOLD . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-31
CORRECTION CONSTANTS MENU . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-32
FRQ RSP CC ON/off (:DIAG:SERV:CCON:FRES {OFF|ON|0|1}) . . . . . . . . 10-32
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
XTAL CC ON/off (:DIAG:SERV:CCON:XTAL {OFF|ON|0|1}) . . . . . . . . . 10-32
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
IF GAIN CC ON/off (:DIAG:SERV:CCON:IFG {OFF|ON|0|1}) . . . . . . . . 10-33
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SOURCE CC ON/off (:DIAG:SERV:CCON:SOUR {OFF|ON|0|1}) . . . . . . . . 10-33
Correction Constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-33
IF CONTROL MENU . . . . . . . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-35
3rd LO [ ] (:DIAG:SERV:IF:TLOC:MODE {AUTO|AC|DC}) . . . . . . . . . . 10-36
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
IF BPF [ ] (:DIAG:SERV:IF:BPF:MODE {AUTO|BW3M|BW1M|XTAL}) . . . . . 10-36
Contents-7
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
IF GAIN [ ] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-36
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
IF RANGE [ ] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-37
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
IF LPF [ ] (:DIAG:SERV:IF:LPF:MODE
{AUTO|BW5K|BW15K|BW50K|BW150K|THR}) . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-38
S/H BW [ ] (:DIAG:SERV:IF:SHBW:MODE {AUTO|NARR|MIDD|WIDE}) . . . . . 10-38
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
A/D MUX [ ] (:DIAG:SERV:IF:ADMX:MODE {AUTO|ALT|DEG0|DEG90}) . . . . 10-39
SYNTHESIZER CONTROL MENU . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-40
1st LO OSC [ ] (:DIAG:SYNT:FLOC:MODE {AUTO|SING|TRIP}) . . . . . . . 10-41
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FN OSC [ ] (:DIAG:SERV:STNT:FN:MODE {AUTO|NARR|WIDE}) . . . . . . . . 10-41
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
STEP OSC [ ] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-41
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FREQUENCY OFFSET (:DIAG:SERV:SYNT:FREQ:OFFS) . . . . . . . 10-42
SOURCE CONTROL MENU . . . . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-43
SOURCE AUTO man (:DIAG:SERV:SOUR:MODE {AUTO|MAN}) . . . . . . . . . . 10-43
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ALC LOOP open CLOSE (:DIAG:SERV:SOUR:ALCL: {OPEN|CLOSE}) . . . . . . 10-43
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
OUTPUT ATT [ ] (:DIAG:SERV:SOUR:ATT
{AUTO|DB0|DB10|DB20|DB30|DB40|DB50|DB60} ) . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-43
LVL DAC AUTO man (:DIAG:SERV:SOUR:LEV:DAC:MODE {AUTO|MAN}) . . . . . 10-44
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
LVL DAC VALUE (:DIAG:SERV:SOUR:LEV:DAC:VAL ) . . . . . . . 10-44
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
GAIN DAC AUTO man (:DIAG:SERV:SOUR:GAIN:DAC:MODE {AUTO|MAN}) . . . . 10-44
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
GAIN DAC VALUE (:DIAG:SERV:SYNT:STEP:DAC:VAL ) . . . . . . 10-44
BOOTLOADER MENU . . . . . . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-45
SYSTEM UPDATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-45
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SYSTEM BACKUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-45
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PREVIEW DISK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-46
NNNNNNNNNNNNNNNNNNNN
REBOOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-46
11. Theory of Operation
ANALYZER OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
Spectrum Analyzer Operation . . . . . . . . . . . . . . . . . . . . . . . 11-2
Network Analyzer Operation . . . . . . . . . . . . . . . . . . . . . . . . 11-2
Test Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3
ANALYZER FUNCTIONAL GROUPS . . . . . . . . . . . . . . . . . . . . . . 11-4
POWER SUPPLY OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . 11-5
Line Power Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-7
A40 Preregulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-7
A50 DC-DC Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-7
Switching Regulator 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 11-7
Switching Regulator 2 . . . . . . . . . . . . . . . . . . . . . . . . . . 11-7
Regulated +5V Digital Supply (+5 VD) . . . . . . . . . . . . . . . . . . 11-7
A50 Shutdown LED . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-7
A2 Post-Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-8
Shutdown Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-8
Seven Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-8
A7 Input and A8 Output Attenuator Drive Circuit . . . . . . . . . . . . . 11-9
DIGITAL CONTROL OPERATION . . . . . . . . . . . . . . . . . . . . . . . 11-10
A1 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
A30 Front-Panel Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
A31 I/O Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
A32 I-BASIC Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
Contents-8
A51 GSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-13
A54 Inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-13
A52 LCD (Liquid Crystal Display) . . . . . . . . . . . . . . . . . . . . . . 11-13
A53 FDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-13
SOURCE THEORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14
A5 Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16
REF OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16
Leveler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16
FRAC N OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16
STEP OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-17
Multiplier (X 13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-18
A4A1 1st LO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-18
1st Local OSC Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-18
Single-Loop Operation at Frequency Spans > 45 MHz . . . . . . . . . . 11-19
Triple-Loop Operation at Frequency Spans 45 MHz . . . . . . . . . . 11-19
Digital Control Signals for the A4A2 Receiver RF . . . . . . . . . . . . . 11-19
A3A1 ALC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-19
Divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-19
Source OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-19
ALC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-20
A3A2 2nd LO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-20
2nd Local OSC Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . 11-20
Source First Mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-21
A3A3 Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-21
A7 Output Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-21
RECEIVER THEORY . . . . . . . . . . . . . . . . . . . . . . . .