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Agilent 4291B RF Impedance/Material Analyzer
SERVICE MANUAL
SERIAL NUMBERS
This manual applies directly to instruments with serial
number pre x JP1KE, or rmware revision 01.00.
For additional important information about serial numbers, read \ANALYZERS
COVERED BY THIS MANUAL" in General Information of this service manual.
Agilent Part No. 04291-90111
Printed in JAPAN March 2001
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 Company.
Agilent Technologies Japan, Ltd.
Component Test PGU-Kobe
1-3-2, Murotani, Nishi-ku, Kobe-shi,
Hyogo, 651-2241 Japan
Copyright 1998, 2000, 2001 Agilent Technologies Japan, Ltd.
c
Manual Printing History
The manual 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.
January 1998 : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : First Edition
May 1998 : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : Second Edition (part number: 04291-90111)
June 2000 : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : Third Edition (part number: 04291-90111)
March 2001 : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : Fourth Edition (part number: 04291-90111)
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 given elsewhere in this manual violates safety standards of design, manufacture,
and intended use of the instrument.
The Agilent Technologies Company assumes no liability for the customer's failure to comply
with these requirements.
Note 4291B comply with INSTALLATION CATEGORY II and POLLUTION DEGREE 2
in IEC1010-1. 4291B are INDOOR USE product.
Note LEDs in 4291B are Class 1 in accordance with IEC825-1.
CLASS 1 LED PRODUCT
Ground The Instrument
This is a Safety Class 1 product (provided with a protective earth terminal). An uninterruptible
safety earth ground must be provided from the main power source to the product input wiring
terminals, power source to the product input wiring terminals, power cord, or supplied power
cord set. Whenever it is likely that the protection has been impaired, the product must be
made inoperative and secured against any unintended operation.
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 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.
iv
DO NOT Substitute Parts Or Modify Instrument
Because of the danger of introducing additional hazards, do not 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 the safety features are maintained.
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.
v
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 LCD are enclosed in .
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.
vi
Certi cation
Agilent Technologies Company 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 Company 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.
vii
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.
Documentation Map
The following manuals are available for the analyzer:
Quick Start Guide(Agilent Part Number 04291-90031)
The Quick Start 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.
Operation Manual(Agilent Part Number 04291-90030)
The Operation Manual describes all function accessed from the front panel keys and
softkeys.It also provides information on option and accessories available and the analyzer
features.
Programming Manual (Agilent Part Number 04291-90027)
The Programming Manual provides information on GPIB programming.
HP Instrument BASIC Users Handbook, (Agilent Part Number E2083-90005)
The HP Instrument BASIC Users Handbook introduces you to the HP Instrument BASIC
programming language, provides some helpful hints on getting the most use from it, and
provides 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.
Service Manual (Option 0BW only), (Agilent Part Number 04291-90111)
The Service Manual explains how to do performance tests, and to adjust, troubleshoot, and
repair the instrument.
APC-7
is a U.S. registered trademark of the Bunker Ramo Corporation.
R
viii
Contents
1. General Information
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
ORGANIZATION OF SERVICE MANUAL . . . . . . . . . . . . . . . . . . . . 1-1
ANALYZERS COVERED BY MANUAL . . . . . . . . . . . . . . . . . . . . . 1-3
TABLE OF SERVICE TEST EQUIPMENT . . . . . . . . . . . . . . . . . . . . 1-4
2. Performance Tests
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Warm Up Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Ambient Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Calibration Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Performance Test Record . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . 2-2
FREQUENCY ACCURACY TEST . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Speci cation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
OSC LEVEL ACCURACY TEST . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Speci cation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
MEASUREMENT ACCURACY TEST . . . . . . . . . . . . . . . . . . . . . . 2-8
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Speci cation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Save the Analyzer Setup . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Analyzer Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Open Measurement Test . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Short Measurement Test . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
50
Measurement Test . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
10 cm Airline with Open Test . . . . . . . . . . . . . . . . . . . . . . . 2-13
10 cm Airline with Short Test . . . . . . . . . . . . . . . . . . . . . . . 2-15
DC BIAS LEVEL ACCURACY TEST (OPTION 001) . . . . . . . . . . . . . . . 2-17
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Speci cation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
PERFORMANCE TEST RECORD . . . . . . . . . . . . . . . . . . . . . . . 2-20
Frequency Accuracy Test . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Without Option 1D5 . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
With Option 1D5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Osc Level Accuracy Test . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Contents-1
Norm-Temp High-Impedance Test Head . . . . . . . . . . . . . . . . . . 2-20
Norm-Temp Low-Impedance Test Head (Option 012) . . . . . . . . . . . . 2-21
High-Temp High-Impedance Test Head (Option 013) . . . . . . . . . . . . 2-21
High-Temp Low-Impedance Test Head (Option 014) . . . . . . . . . . . . . 2-22
Measurement Accuracy Test . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Norm-Temp High-Impedance Test Head . . . . . . . . . . . . . . . . . . 2-23
Norm-Temp Low-Impedance Test Head (Option 012) . . . . . . . . . . . . 2-31
High-Temp High-Impedance Test Head (Option 013) . . . . . . . . . . . . 2-39
High-Temp Low-Impedance Test Head (Option 014) . . . . . . . . . . . . . 2-47
DC Bias Accuracy Test . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-55
3. Adjustments and Correction Constants
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
REQUIRED EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
WARM-UP FOR ADJUSTMENTS AND CORRECTION CONSTANTS . . . . . . . . 3-2
INSTRUMENT COVER REMOVAL . . . . . . . . . . . . . . . . . . . . . . . 3-2
ORDER OF ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
UPDATING Correction Constants USING THE ADJUSTMENTS PROGRAM . . . . 3-3
Adjustments Program . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Keyboard and Mouse Operation . . . . . . . . . . . . . . . . . . . . . . 3-3
Controller Requirement . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Updating Correction Constants . . . . . . . . . . . . . . . . . . . . . . . 3-5
40 MHz REFERENCE OSCILLATOR FREQUENCY ADJUSTMENT . . . . . . . . 3-6
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
520 MHz LEVEL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . 3-8
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
COMB GENERATOR ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . 3-10
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
STEP PRETUNE CORRECTION CONSTANTS . . . . . . . . . . . . . . . . . . 3-13
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
SECOND LOCAL PLL LOCK ADJUSTMENT . . . . . . . . . . . . . . . . . . 3-14
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
SOURCE VCXO ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
THIRD LOCAL VCXO ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . 3-17
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
SOURCE MIXER LOCAL LEAKAGE ADJUSTMENT . . . . . . . . . . . . . . . 3-18
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
OSC LEVEL CORRECTION CONSTANTS . . . . . . . . . . . . . . . . . . . . 3-20
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
HOLD STEP ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
BAND PASS FILTER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . 3-22
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Contents-2
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
DC BIAS LEVEL CORRECTION CONSTANTS (OPTION 001 ONLY) . . . . . . . . 3-24
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
10 MHz REFERENCE OSCILLATOR FREQUENCY ADJUSTMENT (OPTION 1D5
ONLY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
4. Overall Troubleshooting
TROUBLESHOOTING SUMMARY . . . . . . . . . . . . . . . . . . . . . . . 4-2
INSPECT THE POWER ON SEQUENCE . . . . . . . . . . . . . . . . . . . . 4-4
Check the Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Check the Front Panel LEDs . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Check Error Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Troubleshooting When Power On Self-test Failed . . . . . . . . . . . . . . 4-5
A2 POST REGULATOR Test Fail . . . . . . . . . . . . . . . . . . . . . . 4-6
VERIFY FUNCTIONAL GROUPS . . . . . . . . . . . . . . . . . . . . . . . 4-7
Source Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Receiver Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Transducer Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
INSPECT THE REAR PANEL FUNCTION . . . . . . . . . . . . . . . . . . . 4-12
Check the GPIB Interface . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Check the Parallel Interface . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Check the mini DIN Keyboard Connector . . . . . . . . . . . . . . . . . . 4-12
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 Eight A2 LEDs . . . . . . . . . . . . . . . . . . . . . . . . 5-5
6. Run Internal Test 4: A2 POST REGULATOR . . . . . . . . . . . . . . . . 5-6
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 A22J1 (Option 001 Only) . . . . . . . . . . . . 5-9
4. Disconnect the Cable from the A1J10 . . . . . . . . . . . . . . . . . . 5-9
5. Remove Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
FIND OUT WHY THE A1 +5 VD LED IS NOT ON STEADILY . . . . . . . . . . 5-11
1. Check the A40 Pre-regulator . . . . . . . . . . . . . . . . . . . . . . . 5-11
2. Check the A50 DC-DC Converter . . . . . . . . . . . . . . . . . . . . . 5-11
3. Disconnect Cables on the A1 CPU . . . . . . . . . . . . . . . . . . . . 5-12
Contents-3
4. Remove Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
TROUBLESHOOT THE FAN AND THE A50 DC-DC CONVERTER . . . . . . . . 5-14
1. Troubleshoot the Fan . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
2. Troubleshoot the A50 DC-DC Converter . . . . . . . . . . . . . . . . . 5-15
TROUBLESHOOT THE A2 POST-REGULATOR . . . . . . . . . . . . . . . . . 5-17
1. Check the A40 Pre-Regulator . . . . . . . . . . . . . . . . . . . . . . 5-17
2. Check the A50 DC-DC Converter . . . . . . . . . . . . . . . . . . . . . 5-17
3. Remove Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
4. Measure the A2 Post Regulator Output Voltages . . . . . . . . . . . . . . 5-17
6. Digital Control Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
1. Check the Power On Sequence . . . . . . . . . . . . . . . . . . . . . . 6-3
Check the 4 5 and 4 5 Operations . . . . . . . . . . . .
Ch 1 Ch 2 . . . . . . . 6-3
Check the A1 Eight LEDs . . . . . . . . . . . . . . . . . . . . . . . . 6-3
2. Check Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Identify the First Failed Test . . . . . . . . . . . . . . . . . . . . . . . 6-4
3. Check the A1 DRAM and Flash Memory . . . . . . . . . . . . . . . . . 6-5
4. Check the A1 Volatile Memory . . . . . . . . . . . . . . . . . . . . . . 6-6
5. Check the A30 Front Keyboard . . . . . . . . . . . . . . . . . . . . . 6-6
6. Check the A53 FDD . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
7. Check the A32 I-BASIC Interface and the mini DIN Keyboard . . . . . . . 6-7
TROUBLESHOOT THE A51 GSP and A52 LCD . . . . . . . . . . . . . . . . . 6-8
1. Run the Internal Test 3: A51 GSP . . . . . . . . . . . . . . . . . . . . 6-8
2. Check the A52 LCD(Liquid Crystal Display) . . . . . . . . . . . . . . . . 6-8
7. Source 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 Source Vernier Output . . . . . . . . . . . . . . . . . . . 7-3
Check A3A2 2nd LO Outputs . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Check A3A3 Source Output . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Check A7 Output Attenuator Control Signals . . . . . . . . . . . . . . . . 7-4
Check A22 DC Bias 1/2 Output . . . . . . . . . . . . . . . . . . . . . . . 7-4
Check A60 High Stability Frequency Reference (Option 1D5) . . . . . . . . . 7-4
START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
CHECK A5 SYNTHESIZER OUTPUTS . . . . . . . . . . . . . . . . . . . . . 7-6
1. Check the INT REF Signal . . . . . . . . . . . . . . . . . . . . . . . . 7-6
2. Check the FRAC N OSC Signal . . . . . . . . . . . . . . . . . . . . . . 7-8
3. Check the STEP OSC Signal . . . . . . . . . . . . . . . . . . . . . . . 7-10
4. Check the 520 MHz Signal . . . . . . . . . . . . . . . . . . . . . . . . 7-13
5. Check the EXT REF Operation . . . . . . . . . . . . . . . . . . . . . . 7-15
CHECK A4A1 1ST LO OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . 7-17
1. Check the 1st LO OSC Signal at A4A1J3 . . . . . . . . . . . . . . . . . 7-17
2. Check the 1st LO OSC Signal at A4A1J4 . . . . . . . . . . . . . . . . . 7-19
CHECK AN A3A1 SOURCE VERNIER OUTPUT . . . . . . . . . . . . . . . . 7-21
1. Check the 21.42 MHz Signal . . . . . . . . . . . . . . . . . . . . . . . 7-21
CHECK A3A2 2ND LO OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . 7-23
1. Check the 2nd Local Oscillator Signal . . . . . . . . . . . . . . . . . . 7-23
2. Check the 2.05858 GHz Signal . . . . . . . . . . . . . . . . . . . . . . 7-24
CHECK A3A3 SOURCE OUTPUT . . . . . . . . . . . . . . . . . . . . . . . 7-27
Contents-4
1. Check the A3A3 RF Signal . . . . . . . . . . . . . . . . . . . . . . . . 7-27
CHECK A7 OUTPUT ATTENUATOR CONTROL SIGNALS . . . . . . . . . . . . 7-29
1. Check A7 Control Signals . . . . . . . . . . . . . . . . . . . . . . . . 7-29
CHECK A22 DC BIAS 1/2 OUTPUT . . . . . . . . . . . . . . . . . . . . . . 7-31
1. Check A22 Output Voltages . . . . . . . . . . . . . . . . . . . . . . . 7-31
CHECK THE A60 HIGH STABILITY FREQUENCY REFERENCE . . . . . . . . . 7-33
8. Receiver Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
RECEIVER GROUP TROUBLESHOOTING SUMMARY . . . . . . . . . . . . . . 8-3
START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
FRONT ISOL'N Test Failure Troubleshooting . . . . . . . . . . . . . . . . 8-5
9. Transducer Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
TRANSDUCER GROUP TROUBLESHOOTING SUMMARY . . . . . . . . . . . . 9-4
START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
CABLE ISOL'N Test Failure Troubleshooting . . . . . . . . . . . . . . . . 9-6
High Temperature Test Head Trouble Isolation (Opt. 013 and 014) . . . . . . 9-7
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
NNNNNNNNNNNNNNNNNNNNNNN
READ ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-3
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FIRMWARE REVISION (:DIAG:FREV?) . . . . . . . . . . . . . . . . . . . . 10-4
TESTS MENU . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . . . . . 10-5
EXECUTE TEST (:DIAG:TEST:EXET) . . . . . . . . . . . . . . . . . . . . . 10-5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
INTERNAL TESTS (:DIAG:TEST 0) . . . . . . . . . . . . . . . . . . . . . 10-5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
EXTERNAL TESTS (:DIAG:TEST 17) . . . . . . . . . . . . . . . . . . . . . 10-6
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ADJUSTMENT TESTS (:DIAG:TEST 34) . . . . . . . . . . . . . . . . . . . . 10-6
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DISPLAY TESTS (:DIAG:TEST 40) . . . . . . . . . . . . . . . . . . . . . 10-6
Test Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6
Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7
Test Descriptions . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . . . . . 10-8
INTERNAL TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8
0: ALL INT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8
1: A1 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8
2: A1 VOLATILE MEMORY . . . . . . . . . . . . . . . . . . . . . . . . 10-8
3: A51 GSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
4: A2 POST REGULATOR . . . . . . . . . . . . . . . . . . . . . . . . 10-9
5: A6 A/D CONVERTER . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
6: A5 REFERENCE OSC . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
7: A5 FRACTIONAL N OSC . . . . . . . . . . . . . . . . . . . . . . . . 10-9
8: A5 STEP OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
9: A4A1 1ST LO OSC . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
10: A3A2 2ND LO OSC . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
Contents-5
11: A3A1 DIVIDER . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
12: A6 3RD LO OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
13: A3A1 SOURCE OSC . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
14: A6 SEQUENCER . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
15: SOURCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
16: DC BIAS . . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . 10-10
EXTERNAL TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
17: FRONT PANEL DIAG. . . . . . . . . . . . . . . . . . . . . . . . . 10-10
18: DSK DR FAULT ISOL'N . . . . . . . . . . . . . . . . . . . . . . . . 10-10
19: POWER SWEEP LINEARITY . . . . . . . . . . . . . . . . . . . . . 10-11
20: SOURCE FLATNESS . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
21: OUTPUT ATTENUATOR . . . . . . . . . . . . . . . . . . . . . . . 10-11
22: RECEIVER GAIN . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
23: A6 GAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
24: A6 V/I NORMALIZER . . . . . . . . . . . . . . . . . . . . . . . . 10-11
25: FRONT ISOL'N . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
26: TRD LOSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
27: CABLE ISOLATION . . . . . . . . . . . . . . . . . . . . . . . . . 10-12
28: TRD ISOL'N I TO V . . . . . . . . . . . . . . . . . . . . . . . . . 10-12
29: TRD ISOL'N V TO I . . . . . . . . . . . . . . . . . . . . . . . . . 10-12
30: HIGH Z HEAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-12
31: LOW Z HEAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-12
32: HIGH TEMP HIGH Z HEAD . . . . . . . . . . . . . . . . . . . . . . 10-12
33: HIGH TEMP LOW Z HEAD . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . 10-12
ADJUSTMENT TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
34: HOLD STEP ADJ . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
35: BPF ADJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
36: 3RD VCXO LEVEL ADJ . . . . . . . . . . . . . . . . . . . . . . . 10-13
37: 2ND LO PLL LOCK ADJ . . . . . . . . . . . . . . . . . . . . . . . 10-13
38: SOURCE MIXER LEAK ADJ . . . . . . . . . . . . . . . . . . . . . 10-13
39: SOURCE VCXO LEVEL ADJ . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . 10-13
DISPLAY TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
40: TEST PATTERN 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
41: TEST PATTERN 2 . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
42: TEST PATTERN 3 . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
43: TEST PATTERN 4 . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14
44: TEST PATTERN 5 . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14
SERVICE MODES MENU . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . 10-15
BUS MEAS [OFF] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CORRECTION CONSTANTS . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
NNNNNNNNNNNNNNNNN
SYNTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
NNNNNNNNNNN
OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
NNNNNNNNNNNNNNNNNNNNNNN
DC BIAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16
NNNNNNNNNNN
TRD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16
NNNNNNNN
IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16
Service Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16
BUS MEASUREMENT MENU . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . 10-17
BUS MEAS on OFF (:DIAG:SERV:BUS:STAT {ON|OFF}) . . . . . . . . . . . . 10-17
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DC BUS [OFF] (:DIAG:SERV:BUS:DC ) . . . . . . . . . . . . . 10-17
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FREQ BUS [OFF] (:DIAG:SERV:BUS:FREQ ) . . . . . . . . . . . 10-17
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
AZ SWITCH on OFF (:DIAG:SERV:BUS:AZER {OFF|ON|0|1} ) . . . . . . . . . 10-18
Contents-6
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
WAIT COUNT (:DIAG:SERV:BUS:WAIT ) . . . . . . . . . . . . . 10-18
Bus Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
Bus Measurement Procedure . . . . . . . . . . . . . . . . . . . . . . . . 10-18
Bus Measurement Values . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
DC Bus Node Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
0: OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
1: +5 V (AUX) (2.025 U) . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
2: 015 V (01.92 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
3: 012.6 V (02.124 U) . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
4: 05 V (02.025 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
5: +5 V (2.025 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
6: +5.3 V (2.1465 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
7: +8.5 V (1.8955 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
8: +15 V (AUX) (1.92 U) . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
9: +15 V (1.92 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
10: +22 V (2.002 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
11: FAN POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
12: +65 V (2.0605 U) . . . . . . . . . . . . . . . . . . . . . . . . . . 10-21
13: SRC VTUNE (Source Oscillator VCO Tuning Voltage) . . . . . . . . . . 10-21
14: 2ND LO VTUNE (Second Local Oscillator VCO Tuning Voltage) . . . . . 10-21
15: DET OUT (Detector Output) . . . . . . . . . . . . . . . . . . . . . 10-21
16: SRC LO LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-21
17: DAC OUT (Level DAC Output Voltage) . . . . . . . . . . . . . . . . . 10-22
18: 1ST LO VTUNE (First Local Oscillator VCO Turning Voltage) . . . . . . 10-22
19: STEP VTUNE (Step Oscillator VCO Turning Voltage) . . . . . . . . . . 10-22
20: FN VTUNE (Fractional N Oscillator VCO Turning Voltage) . . . . . . . 10-23
21: FN INTEG OUT (Fractional N Oscillator Integrator Output Voltage) . . . 10-23
22: REF VTUNE (Reference Oscillator VCO Tuning Voltage) . . . . . . . . 10-24
23: 3RD LO VTUNE (Third Local Oscillator VCO Tuning Voltage) . . . . . . 10-24
24: 3RD LO LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
25: AD VREF (A/D Converter Voltage Reference) . . . . . . . . . . . . . 10-24
26: DC BIAS VOLTAGE . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
27: DC BIAS CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . 10-25
28: GND A22A23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-25
29: GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-25
Frequency Bus Node Descriptions . . . . . . . . . . . . . . . . . . . . . . 10-25
0: OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-25
1: SOURCE OSC (Source Oscillator) . . . . . . . . . . . . . . . . . . . . 10-25
2: DIVIDER OUT (Divider Output) . . . . . . . . . . . . . . . . . . . . 10-25
3: STEP OSC (Step Oscillator) . . . . . . . . . . . . . . . . . . . . . . 10-25
4: FN OSC (Fractional N Oscillator) . . . . . . . . . . . . . . . . . . . . 10-26
5: REF OSC (Reference Oscillator) . . . . . . . . . . . . . . . . . . . . 10-26
6: 3RD LO OSC (Third Local Oscillator) . . . . . . . . . . . . . . . . . . 10-26
7: SAMPLE HOLD . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-26
CORRECTION CONSTANTS MENU . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-27
OSC LVL CC [ ] (:DIAG:SERV:CCON:OLEV {NORM|FRON|OFF}) . . . . . . . . 10-27
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DC BIAS CC ON/off (:DIAG:SERV:CCON:DCB {OFF|ON|0|1}) . . . . . . . . 10-28
Correction Constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-28
SYNTHESIZER CONTROL MENU . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-29
1st LO OSC [ ] (:DIAG:SYNT:FLOC:MODE {AUTO|SING|TRIP}) . . . . . . . 10-30
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FN OSC [ ] (:DIAG:SERV:STNT:FN:MODE {AUTO|NARR|WIDE}) . . . . . . . . 10-30
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
STEP OSC [ ] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-30
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FREQUENCY OFFSET (:DIAG:SERV:SYNT:FREQ:OFFS . . . . . . . . . . . . . 10-31
Contents-7
OSC CONTROL MENU . . . . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . 10-32
OSC AUTO man (:DIAG:SERV:SOUR:MODE {AUTO|MAN}) . . . . . . . . . . . . 10-32
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
OUTPUT ATT [ ] (:DIAG:SERV:SOUR:ATT
{AUTO|DB0|DB10|DB20|DB30|DB40|DB50|DB60} ) . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . 10-32
OSC DAC AUTO man (:DIAG:SERV:SOUR:LEV:DAC:MODE {AUTO|MAN}) . . . . . 10-33
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
OSC DAC VALUE (:DIAG:SERV:SOUR:LEV:DAC:VAL ) . . . . . . . 10-33
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
OSC OUT ON off (:DIAG:SERV:SOUR:STAT {OFF|ON|0|1} ) . . . . . . . . . 10-33
DC BIAS CONTROL MENU . . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . 10-34
DC BIAS AUTO man (:DIAG:SERV:DCB:MODE {AUTO|MAN}) . . . . . . . . . . 10-35
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
POLARITY [ ] (:DIAG:SERV:DCB:POL {AUTO|POS|NEG} ) . . . . . . . . . . 10-35
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CUR OFST [ ] (:DIAG:SERV:DCB:OFFS {AUTO|POS|NEG}) . . . . . . . . . . 10-35
NNNNNNNNNNN
DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-35
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
RELAY ON off (:DIAG:SERV:DCB:STAT {OFF|ON|0|1} ) . . . . . . . . . . . 10-36
TRANSDUCER CONTROL MENU . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . 10-37
TRD ATT AUTO man (:DIAG:SERV:TRAN:MODE {AUTO|MAN}) . . . . . . . . . 10-38
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
TRD RANGE (:DIAG:SERV:TRAN:RANG {AUTO|EXP|NORM}) . . . . . . . . . . 10-38
NNNNNNNNNNNNNNNNNNNNNNNNNN
MEAS [ ] (:DIAG:SERV:TRAN:SENS:FUNC {IMP|VOLT|CURR|VIR} ) . . . . . . 10-39
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
TEST HEAD [ ] (:DIAG:SERV:TRAN:THE {HIMP|LIMP|HTHI|HTLI}) . . . . . 10-39
IF CONTROL MENU . . . . . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . 10-40
IF GAIN AUTO man (:DIAG:SERV:IF:GAIN:MODE {AUTO|MAN}) . . . . . . . . 10-41
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
GAIN XV [ ] (:DIAG:SERV:IF:GAIN:X:XV {DB0|DB6|DB12}) . . . . . . . . 10-41
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
GAIN XI [ ] (:DIAG:SERV:IF:GAIN:X:XI {DB0|DB6|DB12}) . . . . . . . . 10-41
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
GAIN Y [ ] (:DIAG:SERV:IF:GAIN:Y {DB0|DB6|DB12|DB18} ) . . . . . . . . 10-41
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
GAIN Z [ ] (:DIAG:SERV:IF:GAIN:Z {DB0|DB2|DB4|DB18} ) . . . . . . . . 10-41
NNNNNNNNNNNNNNNNN
IF BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-42
BOOTLOADER MENU . . . . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . 10-43
SYSTEM UPDATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-43
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SYSTEM BACKUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-43
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PREVIEW DISK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-44
NNNNNNNNNNNNNNNNNNNN
REBOOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-44
11. Theory of Operation
OVERALL ANALYZER OPERATION . . . . . . . . . . . . . . . . . . . . . . 11-1
ANALYZER FUNCTIONAL GROUPS . . . . . . . . . . . . . . . . . . . . . . 11-2
POWER SUPPLY OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . 11-3
Line Power Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-5
A40 Preregulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-5
A50 DC-DC Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-5
Switching Regulator 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 11-5
Switching Regulator 2 . . . . . . . . . . . . . . . . . . . . . . . . . . 11-5
Regulated +5V Digital Supply (+5 VD) . . . . . . . . . . . . . . . . . . 11-5
A50 Shutdown LED . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-5
A2 Post-Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-6
Shutdown Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-6
Eight Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-6
A7 Output Attenuator Drive Circuit . . . . . . . . . . . . . . . . . . . . 11-7
DIGITAL CONTROL OPERATION . . . . . . . . . . . . . . . . . . . . . . . 11-8
A1 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-10
Contents-8
A30 Front-Panel Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . 11-10
A31 I/O Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-10
A32 I-BASIC Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-10
A51 GSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-11
A52 LCD (Liquid Crystal Display) . . . . . . . . . . . . . . . . . . . . . . 11-11
A53 FDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-11
A54 Inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-11
SOURCE THEORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
A5 Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14
REF OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14
FRAC N OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14
STEP OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-15
Multiplier (2 13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16
A4A1 1st LO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16
1st Local OSC Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16
Single-Loop Operation at Frequency Spans > 45 MHz . . . . . . . . . . 11-16
Triple-Loop Operation at Frequency Spans 45 MHz . . . . . . . . . . 11-16
A3A1 Source Vernier . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-17
Divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-17