Anritsu 373XXA User Manual

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MODEL

373XXA

VECTOR NETWORK ANALYZER

MAINTENANCE MANUAL

490 JARVIS DRIVE l MORGAN HILL, CA 95037-2809

P/N: 10410-00185

REVISION: D

PRINTED: MARCH 2000

WARRANTY

The ANRITSU product(s) listed on the title page is (are) warranted against defects in materials and workmanship for one year from the date of shipment. ANRITSU’sobligation covers repairing or replacing products which prove to be defective during the warranty period. Buyers shall prepay transportation charges for equipment returned to ANRITSU for warranty repairs. Obligation is limited to the original purchaser.ANRITSU is not liable for con sequential damages.

LIMITATION OF WARRANTY

The foregoing warranty does not apply to ANRITSU connectors that have failed due tonormal wear. Also, the warranty does not apply to defects resulting from improper or inadequate maintenance by the Buyer, unauthorized modification or misuse, or operation outside of the environmental specifications of the product. No other warranty is expressed or implied, and the remedies provided herein are the Buyer’s sole and exclusive remedies.

TRADEMARK ACKNOWLEDGEMENTS

V Connector and K Connector are registered trademarks of ANRITSU Company. ANACAT is a registered trademark of EEsof, Inc. Ink Jet and Think Jet are registered trademarks of Hewlett-Packard Co. MS-DOS is a registered trademark of Microsoft Corporation.

NOTICE

ANRITSU Company has prepared this manual for use by ANRITSU Company personnel and cus tomers as a guide for the proper installation, operation and maintenance of ANRITSU Company equipment and computer programs. The drawings, specifications, and information contained herein are the property of ANRITSU Company, and any unauthorized use or disclosure of these drawings, specifications, and information is prohibited; they shall not be reproduced, copied, or used in whole or in part as the basis for manufacture or sale of the equipment or software programs without the prior written consent of ANRITSU Company.

Table of Contents, Narrative

Chapter 1 — General Service Information

This chapter provides a general description of Series373XXA Vector Network Analyzer systems, sys tem serial numbers, and frequency ranges. It explains the level of maintenance covered in this man ual and the service strategy used throughout this manual. It also contains static-sensitive component handling precautions and a list of recommended test equipment.

Chapter 2 — Replaceable Parts

This chapter lists all replaceable subassemblies and components for all373XXA models. It explains the ANRITSUexchange assembly program and provides parts ordering information.

Chapter 3 — Operational Tests

This chapter contains procedures that provide a means of fully testing the373XXA VNA system for proper operation and signal stability. These tests are intended to be used as a periodic check of the operational functionality of the373XXA.

Chapter 4 — Performance Verification Procedures

This chapter provides detailed procedures for verifying that the performance of the373XXA meets minimum performance standards.

Chapter 5 — Troubleshooting

This chapter provides information for troubleshooting Series373XXA Vector Network Analyzer systems. The troubleshooting procedures contained in this chapter support fault isolation down to a replaceable subassembly.

Chapter 6 — Adjustments

This chapter provides adjustment procedures for all models of Series373XXA Vector Network Ana lyzer systems. These procedures are used after replacement or repair of one or more critical subas semblies, or as indicated by the Performance Verification Procedures contained in Chapter 4.

Chapter 7 — System Description

This chapter provides descriptions of the functional operation of the major assemblies contained in Series373XXA Vector Network Analyzer systems. The operation of all major circuit blocks is de scribed so that the reader may better understand the function of each assembly as part of the overall operation.

Chapter 8— Removal and Replacement Procedures

This chapter describes how to gain access to all of the major assemblies and major parts for ¬trouble shooting and/or replacement.

Appendix A — Diagnostic Menus

This appendix contains descriptions and usage information for the Diagnostic Menus that are avail able via the front panel Option Menu key.

Appendix B — Error Codes/Messages

This appendix contains a listing of the Error Codes/Messages. Also included is a description of the in formation fields that are part of the error messages.

373XXA MM i

Appendix C — Connector Maintenance Check Procedures

This appendix contains procedures and information needed to perform maintenance checks (includ ing pin-depth measurements) for the connectors on all ANRITSU supplied Calibration/Verification Kit components, Through-cables, and other associated RF/microwave components.

Appendix D — Performance Specifications

Appendix E — Verification Software Users Guide

This appendix contains the Model 360X/372XXB VNA Performance Verification Software Users Guide, P/N: 10410-00208. This Software Users Guide explains in detail the procedures to be used for the installation and operation of the 373XXA VNA Verification Software on your computer/controller.

Index

ii 373XXA MM

Table of Contents, Detailed

Chapter 1 General Information

1-1 SCOPE OF MANUAL ·······················1-3 1-2 INTRODUCTION ·························1-3 1-3 IDENTIFICATION NUMBER ··················1-3 1-4 ONLINE MANUAL ························1-3 1-5 SYSTEM DESCRIPTION ·····················1-4 1-6 RELATED MANUALS·······················1-4 1-7 STANDARD OPTIONS ······················1-4 1-8 SERVICE STRATEGY·······················1-5

Functional Assembly Level Troubleshooting ···········1-5 Internal Hardware Adjustments and Calibrations········1-5 Internal Service Log ························1-5 System Test/Certification ·····················1-6 Preventive Service ·························1-6 Servicing Specially Modified Instruments ············1-6

1-9 SERVICE SUPPORT ·······················1-6

Technical Support ·························1-7 Field Service Kits ·························1-7 Service Software ··························1-7 Verification Kits ··························1-8 Test Fixtures/ Aids·························1-8

Failed Assembly Exchange Program ···············1-8 1-10 PERFORMANCE SPECIFICATIONS ··············1-9 1-11 SERVICE CENTERS ·······················1-9 1-12 STATIC SENSITIVE COMPONENT HANDLING

PROCEDURES ··························1-9 1-13 RECOMMENDED TEST EQUIPMENT ·············1-9

373XXA MM iii

Chapter 2 Replaceable Parts

2-1 INTRODUCTION ·························2-3 2-2 EXCHANGE ASSEMBLY PROGRAM ··············2-3 2-3 REPLACEABLE SUBASSEMBLIES AND PARTS ·······2-3 2-4 PARTS ORDERING INFORMATION ··············2-4

Chapter 3 Operational Tests

3-1 INTRODUCTION ·························3-3 3-2 CHECKING THE SERVICE LOG ················3-4 3-3 SELF TEST ····························3-5 3-4 PERIPHERALS AND INTERFACES ··············3-6

LCDTest······························3-6 Front Panel Test ··························3-7 External Keyboard Interface Test·················3-7 Printer Interface Test ·······················3-7 GPIB Interface Test ························3-9

3-5 SIGNAL PATH ··························3-10

Chapter 4 Performance Verification

4-1 INTRODUCTION ·························4-3 4-2 CALIBRATION AND MEASUREMENT CONDITIONS ····4-3

Standard Conditions························4-3 Special Precautions: ························4-4

4-3 MEASUREMENT ACCURACY··················4-4

Verification Software ·······················4-4

Verification Result Determination ················4-5 4-4 VERIFICATION PROCEDURE ·················4-5 4-5 KEY SYSTEM PARAMETERS ·················4-6

Measurement Environment Considerations ···········4-6

Measurement Technique ·····················4-7

iv 373XXA MM

Chapter 5 Troubleshooting

5-1 INTRODUCTION ·························5-3 5-2 ASSOCIATED INFORMATION IN THIS MANUAL ······5-3 5-3 RECOMMENDED TEST EQUIPMENT ·············5-4 5-4 SYSTEM DOES NOT POWER-UP ················5-4

Line Source and Interface Checks ················5-4 Power Supply Voltages Check ···················5-4 Power Supply Module Check ···················5-6

5-5 SYSTEM DOES NOT BOOT-UP ·················5-7

Boot-up Process Sequence·····················5-7 Troubleshooting Boot-up Problems ················5-8 Hard Disk Problem 1 ·······················5-8 Hard Disk Problem 2 ·······················5-9 Floppy Disk Problems ·······················5-9 Screen Display Problems·····················5-10

5-6 SYSTEM HAS ERROR CODE ·················5-10

Phase Lock Error Codes (6000 Series)··············5-11 Service Log Snap Shot Data ···················5-12

5-7 SOURCE/TEST SET/RECEIVER ················5-17

Signal Source Phase Lock Loop Assemblies···········5-17 Signal Source/Test Set Module Error Codes···········5-18 Isolation Procedures ·······················5-19

5-8 PERIPHERALS/ INTERFACE ·················5-21

CRT Display Test Failures: ···················5-21 Front Panel Test Failures: ····················5-22 External Keyboard Interface Test Failures:···········5-22 Printer Interface Test Failures: ·················5-22 GPIB Interface Test Failures: ··················5-22

5-9 MEASUREMENT IN QUESTION ···············5-22

Measurement Conditions Check List ··············5-23

Chapter 6 Adjustments

6-1 INTRODUCTION ·························6-3 6-2 LO1 CALIBRATION························6-3

Calibration Procedure ·······················6-3 Post Calibration Actions······················6-3

373XXA MM v

6-3 LO 2 CALIBRATION ·······················6-4

Calibration Procedure ·······················6-4

Post Calibration Actions······················6-5 6-4 FREQUENCY CALIBRATION ··················6-5

Calibration Procedure ·······················6-6

Post Calibration Actions······················6-7 6-5 RF POWER/ALC CALIBRATION·················6-8

Calibration Procedure ·······················6-9

Post Calibration Actions ·····················6-10 6-6 SOURCE LOCK THRESHOLD ·················6-11

Calibration Procedure ······················6-12

Post Calibration Actions ·····················6-12 6-7 A8 ADJUSTMENT (37397A) ··················6-13

Calibration Procedure ······················6-13

Post Calibration Actions ·····················6-13 6-8 A21A2 ADJUSTMENT (37397A) ················6-14

Calibration Procedure ······················6-14

Post Calibration Actions ·····················6-15

Chapter 7 System Description

7-1 INTRODUCTION ·························7-3 7-2 SYSTEM OVERVIEW ·······················7-3 7-3 ANALOG SUBSYSTEM ASSEMBLIES ·············7-7

Signal Source Module ·······················7-7

Test Set Module ··························7-8

A7PCB, 10 MHz Timebase ···················7-9

Receiver Module ·························7-10

A8, Source Lock/ Signal Separation and Control PCB ·····7-11

IF Section ·····························7-11

A7PCB,LO3··························7-12

A5 A/D Converter PCB······················7-12 7-4 DIGITALSUBSYSTEM ASSEMBLIES·············7-13

A9 Main Processor PCB Assembly················7-13

A13 I/O Interface #1 PCB Assembly···············7-15

A14 I/O Interface #2 PCB Assembly···············7-15

A15 Graphics Processor PCB Assembly ·············7-16

A16 Hard Disk PCB Assembly··················7-16

Floppy Disk Drive Assembly···················7-16

A24 VME Bus Terminator PCB ·················7-16

vi 373XXA MM

7-5 MAIN CHASSIS ASSEMBLIES·················7-16

A17 System Motherboard Assembly···············7-16 Front Panel Assembly ······················7-16 Rear Panel Assembly·······················7-17 A18 Rear Panel Interface PCB··················7-17 Power Supply Module ······················7-18 Internal VGA Monitor ······················7-19

Chapter 8 Remove and Replace Procedures

8-1 INTRODUCTION ·························8-3 8-2 EQUIPMENT REQUIRED ····················8-3 8-3 COVERS ······························8-4 8-4 A1–A9 AND A13–A16 PCBS ···················8-6

A1 – A9 PCBs ···························8-6

A13 – A16 PCB’s ··························8-6 8-5 A9 PCB BBRAM CHIP······················8-6 8-6 A9 PCB SRAM BATTERY····················8-10 8-7 A24 VME BUS TERMINATOR PCB ··············8-12 8-8 FRONT PANEL ASSEMBLY ··················8-12 8-9 VGA DISPLAY MONITOR ····················8-14 8-10 LIQUID CRYSTAL DISPLAY (LCD) ··············8-16 8-11 FLOPPY DISK DRIVE······················8-17 8-12 REAR PANEL ASSEMBLY ···················8-19 8-13 FAN ASSEMBLY ·························8-21 8-14 POWER SUPPLY MODULE···················8-21 8-15 A18 REAR PANEL PCB ·····················8-22 8-16 TEST SET MODULE ASSEMBLIES ··············8-25

Transfer Switch··························8-25

Input Coupler(s)/ Low Freq Bridge(s) ··············8-26

Power Amplifier ·························8-26

Buffer Amplifier/ Sampler(A31) ·················8-27

Switched Doubler Module Assembly···············8-28

373XXA MM vii

8-17 SIGNAL SOURCE MODULES ·················8-29

Removal of Signal Source Module ················8-29 A21A2 Source Control PCB ···················8-31 A21A1 Source YIG Bias Control PCB ··············8-32 Switched Filter Assembly ····················8-33 Down Converter Assembly····················8-33 YIG Oscillator Assembly ·····················8-34

Appendix A Diagnostics Menus

A-1 INTRODUCTION ·························A-3 A-2 DIAGNOSTICS MENUS ·····················A-3

Start Self Test ···························A-3 Read Service Log ·························A-3 Installed Options ·························A-4 Peripheral Tests ··························A-4 Troubleshooting ··························A-4 H/W Calibrations ·························A-5

Appendix B Error Messages

B-1 INTRODUCTION ·························B-3 B-2 OPERATIONALERROR MESSAGES ··············B-3 B-3 DISK RELATED ERROR MESSAGES··············B-3 B-4 GPIB RELATED ERROR MESSAGES··············B-3 B-5 SERVICE LOG ERROR MESSAGES ··············B-3

0000 - 0099 ····························B-3 0100 - 3999 ····························B-3 4000 - 4999 ····························B-4 5000 - 5999 ····························B-4 6000 - 6999 ····························B-4 7000 - 7999 ····························B-4 8000 - 8999 ····························B-4

viii 373XXA MM

Appendix C Connector Maintenance Check Procedures

C-1 INTRODUCTION ·························C-3 C-2 PRECAUTIONS ·························C-3

Pin Depth Problems ························C-3

Pin-Depth Tolerance························C-4

Avoid Over Torquing Connectors ·················C-4

Teflon Tuning Washers ······················C-4

Avoid Mechanical Shock ·····················C-4

Keep Connectors Clean ······················C-4

Visual Inspection ·························C-5 C-3 REPAIR/ MAINTENANCE···················C-5

Appendix D Performance Specifications Appendix D Performance Specifications Appendix E Performance Verification Software User’s Guide Subject Index

373XXA MM ix/x

Chapter 1 General Information

Table of Contents

Functional Assembly Level Troubleshooting ···········1-5

Internal Hardware Adjustments and Calibrations········1-5

Internal Service Log ························1-5

System Test/Certification ·····················1-6

Preventive Service ·························1-6

Servicing Specially Modified Instruments ············1-6 1-9 SERVICE SUPPORT ·······················1-6

Technical Support ·························1-7

Field Service Kits ·························1-7

Service Software ··························1-7

Verification Kits ··························1-8

Test Fixtures/ Aids·························1-8

PROCEDURES ··························1-9 1-13 RECOMMENDED TEST EQUIPMENT ·············1-9

Figure 1-1. Series 373XXA Vector Network Analyzer System

Chapter 1 General Information

1-1 SCOPE OF MANUAL This manual provides general service and preventive maintenance in

formation for the ANRITSU 373XXA family of Vector Network Analyzer (VNA) systems. It contains procedures for:

Testing the instrument for proper operation.

Verifying measurement accuracy and traceability to National In

stitute of Standards and Technology (NIST). Troubleshooting a failed instrument to the exchange subassem

bly level or the subsystem requiring adjustment. Adjusting instrument internal sub-systems.

Locating and replacing failed parts.

Throughout this manual, the terms “373XXA” and “373XXA VNA” will be used interchangeably to refer to all Series 37300A Network Analyzer system models, unless otherwise noted.

1-2 INTRODUCTION This chapter of the manual provides a general description of 373XXA

VNAsystems, system serial numbers, frequency ranges, and related manuals. Also included is information about the level of maintenance cov ered in this manual, service strategy,available service facilities, and static-sensitive component handling precautions. Alist of recommended test equipment is also provided.

1-3 IDENTIFICATION

NUMBER

All ANRITSU instruments are assigned a six-digit ID number, such as “401001”. This number appears on a decal affixed to the rear panel. Please use this identification number during any correspondence with ANRITSU Customer Service about this instrument.

1-4 ONLINE MANUAL This manual is available on CD ROM as an Adobe Acrobat™ (*.pdf)

file. The file can be viewed using Acrobat Reader™, a free program that is also available on the CD ROM. This file is “linked” such that the viewer can choose a topic to view from the displayed “bookmark” list and “jump” to the manual page on which the topic resides. The text can also be word-searched. Contact ANRITSU Customer Service for price and availability.

373XXA MM 1-3

SYSTEM DESCRIPTION GENERAL INFORMATION

1-5 SYSTEM DESCRIPTION The 373XXA Analyzers are microprocessor controlled Vector Network

373XXA Model Frequencies

Model Freq Range

37317A 22.5 MHz to 8.6 GHz 37325A 40.0 MHz to 13.5 GHz 37347A 40.0 MHz to 20.0 GHz 37369A 40.0 MHz to 40.0 GHz 37397A 40.0 MHz to 65.0 GHz

Analyzers. Each is a single-instrument system that contains a built-in signal source, a test set, and an analyzer subsystem. A typical model (37369A) is shown in Figure 1-1. These analyzers are produced in five models that cover a range of from 22.5 MHz to 65 GHz. The table at left lists the frequencies for each model.

1-6 RELATED MANUALS The 373XXA Vector Network Analyzer Operation Manual (10410-00183)

describes the front panel operation for all 373XXAmodels. It also con tains general information, specifications, and Performance V erification procedures for all models.

The 37XXX Series Vector Network Analyzer Programming Manual (10410-00200) describes all 373XXAGPIB commands and provides programming information for operation of the 373XXA remotely via the IEEE-488 General Purpose Interface Bus. Included at the rear of this manual is the 37XXX Series Vector Network Analyzer GPIB Quick Reference Guide (10410-00201).

Model 360X/373XXA VNA Performance Verification Software Users Guide, P/N: 10410-00208 (located in Appendix E at the rear of this manual). This Software Users Guide explains in detail the procedures to be used for the installation and operation of the 373XXA VNA Veri fication Software on your computer/controller.

1-7 STANDARD OPTIONS The standard 373XXA VNA options and their respective Upgrade Kit part

numbers are:

Option* Description Upgrade Kit

Opt 1 Rack Mount with slides ND39486 Opt 1A Rack Mount ND40916 Opt 2A Time Domain (Microwave

Units) Opt 2B Time Domain (RF Units) ND40914 Opt 10A High Stability Ovenized Time

Base

ND39477

ND45045

∗ All options listed can be installed at ANRITSU Service Centers

1-4 373XXA MM

GENERAL INFORMATION SERVICE STRATEGY

1-8 SERVICE STRATEGY This paragraph provides an overview of the 373XXAVNAservice strat

egy and available service facilities. It also provides references to the infor mation in various locations in this manual needed to accomplish the serv ice functions required for the 373XXA VNA.

Appendices - Refer to the Appendices at the rear of this manual for de tailed descriptions of the following:

Diagnostics Menus and GPIB Commands.

Error Messages.

System Block Diagrams.

Parts Locator Diagrams.

Functional Assembly

Level Troubleshooting

The 373XXA modular design, extensive built-in diagnostics, and auto mated service tools are designed to support fast exchange of functional as sembly level repairs.

Failed assemblies are not field repairable. Once an assembly is found to be faulty, it should be returned to an authorized ANRITSU Service Center for exchange. Refer to the description of the Exchange Assembly Program in Chapter 2, Replaceable Parts.

The procedures for troubleshooting a failed 373XXA VNA are described in this manual in Chapter 5, Troubleshooting.

Internal Hardware

Adjustments and

Calibrations

Internal Service Log The 373XXA continuously monitors itself for proper operation. Should a

There are five automated internal hardware field calibrations. Two of them are used to characterize the 373XXA frequency and power genera tion sub-systems. These calibrations insure fast, consistent phase lock of system frequencies and proper compensation, leveling, and flatness of system power at the front panel test ports.

To conduct these calibrations, you need only connect the appropriate test equipment (counter or power meter) to the 373XXA and initiate the calibration. The 373XXAwill control itself and the externally con nected test equipment to perform measurements and store calibration constants in its internal battery backed RAM (BBRAM).

The procedures for adjusting the 373XXA VNA are described in this manual in Chapter 6, Adjustments.

failure occur, it notifies the user via a failure message on the display screen. (In remote-only operation, it also sets the GPIB Status Byte, if enabled.) It also writes the error message along with some data pertinent to the failure to an internal service log stored in battery backed memory .

The service log can be checked at any time to view (without erasing) all error messages that were written into it. It is capable of storing

373XXA MM 1-5

SERVICE SUPPORT GENERAL INFORMATION

more than 30 pages of service messages and data. The 373XXA will automatically remove the oldest errors first to make room for new er rors, if necessary. To check the contents of the service log, use the pro cedure described in Chapter 3, Operational Tests.

NOTE

A printed or disk file copy of the Service Log (with the fail ure in question) must be made available to ANRITSU when exchanging a failed assembly, or when requesting service support. Refer to Chapter 2, Replaceable Parts, for further information.

System

Test/Certification

Preventive Service The 373XXA A9 Processor PCB contains a battery backed memory/real

Quick operational checkout of the system may be accomplished by the system user or for incoming inspection purposes using the “Operational Checkout” chapter in the 373XXAOperations Manual. Those procedures are useful in quickly verifying that the instrument’s primary measure ment functions are operational and stable.

Full operational testing of the system is detailed in Chapter 3, Operational Tests. These tests should be performed annually, or more often depending on system use.

Verification of the system’s measurement accuracy and other key performance parameters may be done using the procedures in Chapter 4, Performance Verification. This should be performed annually, or more often depending on system use.

time clock chip (BBRAM) and a static memory (SRAM) backup battery. These have a finite life span and should be replaced periodically per the procedures in Chapter 8, Removal and Replacement Procedures.

The BBRAM chip has a rated life span of 4 years. The SRAM backup battery has a worst case elapsed time for SRAM battery protection of 200 days. The SRAM battery life span will vary according to how the system is used; that is, how often the system is powered off for ex tended periods of time.

Servicing Specially

Modified Instruments

Instruments with customer requested special modifications performed by ANRITSU will have an identifying Specials Modification number printed on the rear panel. This number will be preceded with the letters SM, i.e., SM1234 is special modification number 1234.

Special instruments may have service requirements different from those specified in this manual. Contact your local Service Center if you need more information when servicing such instruments.

1-9 SERVICE SUPPORT The following paragraphs briefly describe the various service support

services and aids available to you to help you maintain your 373XXA.

1-6 373XXA MM

GENERAL INFORMATION SERVICE SUPPORT

Technical Support Technical service support is available by contacting any ANRITSU

WorldwideService Center (refer to paragraph 1-11). Or, service support may be obtained directly from the factory by contacting:

ANRITSU Company ATTN: Customer Service 490 Jarvis Drive Morgan Hill, CA95037-2809

Telephone: (408)-778-2000 FAX: (408)-778-0239

If servicing or repairing your own system and you need technical sup

port, you will need to FAX or mail a printout of the items listed below to the ANRITSU Customer Support Engineer:

Measurement data in question

“Operational Tests” results

System state (from UTILITY menu)

Service Log (from DIAGNOSTICS menu)

Field Service Kits The field service kit listed below is available through your local ANRITSU

Sales or Service Center:

ND37200A-2, Field Service Kit

This kit provides for automated field test and performance verification of the 373XXA. It is packaged in a hardened rolling case that also has space for two, user supplied, verification and calibration kits and other accessories.

The ND37200A-2, Field Service Kit is comprised of all major subas

semblies of all models 40 Ghz and below high-end frequency.

ND53269, Field Service Kit

This kit provides for automated field test and performance verification of the 373XXA50 and 65 GHz models (37397A). It supplements kit ND37200A-2.

Service Software The service software listed below is contained on the diskette located at

the rear of this manual:

ANRITSU 37XXX Test Software (2300-178).

This software contains a series of automated tests designed to insure the 373XXA signal paths are functioning properly and capable of sup

porting stable calibrations and measurements. See Operational Tests Chapter for details.

ANRITSU 37XXX Performance Verification Software (2300-237).

This software is used to verify the 373XXA published measurement ac curacy and traceability to the U.S. National Institute of Standards and Technology (NIST). See Chapter 4, Performance Verification, for de

tails.

373XXA MM 1-7

SERVICE SUPPORT GENERAL INFORMATION

Verification Kits The ANRITSU V erificationKits listed below are used in conjunction with

the 37XXX Performance V erificationSoftware (above). See Chapter 4, Per formance Verification, for further information.

N Verification Kit (Model 3663)

Contains precision N Connector components with characteristics that are traceable to the NIST. Use for Models 37317Aand below with Option 7N and 7 NF.

3.5 mm Verification Kit (Model 3666)

Contains precision 3.5 mm Connector components with characteristics that are traceable to the NIST. Use for Models 37347Aand below with Option 7A.

GPC-7 Verification Kit (Model 3667)

Contains precision GPC-7 Connector components with characteristics that are traceable to the NIST. Use for Models 37317Aand below with Option 7A.

K Verification Kit (Model 3668)

Contains precision K Connector components that are traceable to the NIST.

V Verification Kit (Model 3669B)

Contains precision V Connector components that are traceable to the NIST.

Test Fixtures/ Aids The test fixtures and test aids listed below are available through your lo-

cal ANRITSU Sales or Service Center:

Rear Panel Printer Port Test Fixture (B39553).

This test fixture is used to check out digital printer interface circuits on the rear panel assembly.

GPIB Cable (2100-2).

This cable is used to check out digital GPIB interface circuits on the rear panel assembly.

Failed Assembly

Exchange Program

The exchange program allows a customer to quickly exchange a failed subassembly for a factory refurbished, fully system-tested and unit that is under warranty.This results in significant time and price savings as com pared with ordering a new assembly.

Refer to Chapter 2, Replaceable Parts, for a complete list of exchange able assemblies for all Series 373XXA models.

NOTE

When sending a failed assembly to the factory for ex change, a copy of the Service Log must always accom pany the failed assembly. Refer to Chapter 2, Replaceable Parts, for further information.

1-8 373XXA MM

GENERAL INFORMATION PERFORMANCE SPECIFICATIONS

1-10 PERFORMANCE

SPECIFICATIONS

The performance specifications for all Series 373XXA models are con tained in the Technical Data Sheets that are located in Appendix D, Performance Specifications.

1-11 SERVICE CENTERS ANRITSU Company offers a full range of repair and calibration services

at fully staffed and equipped service centers throughout the world. Table 2-1, located on page 2-4, lists all ANRITSU services centers.

1-12 STATIC SENSITIVE

COMPONENT HANDLING PROCEDURES

1-13 RECOMMENDED TEST

EQUIPMENT

The 373XXA contains components that can be damaged by static electric ity. Figure 1-2 illustrates the precautions that should be followed when handling static-sensitive subassemblies and components. If followed, these precautions will minimize the possibilities of static-shock damage to these items.

Table1-1 lists the recommended test equipment to be used for all mainte nance activities for all Series 373XXA models. Note the “Use” codes listed in the right hand column of the table. These codes list the applicable maintenance activities for the equipment listed.

373XXA MM 1-9

RECOMMENDED TEST EQUIPMENT GENERAL INFORMATION

Table 1-1. Recommended Test Equipment (1 of 2)

INSTRUMENT

Computer/Controller PC with Windows 95 or later and National In

struments GPIB hardware and software. Test Software ANRITSU 2300-178 Floppy Disk Formatted, IBM PC format DS/HD 1.44 Mbyte GPIB Cable ANRITSU 2100-2, or equivalent

RF/Microwave Cable DC – 40 GHz, K type connectors (male

or female), Length, 3 ft. BNC Cable Length, 4 ft., 2 each Any Printer Port Test

Fixture Thru Line For models 37317A and below

For models 37325A and above:

Calibration Kit For models 37317A and below, with Opt 7A:

For models 37317A and below, with Opt 7N or 7NF: For models 37325A and above: For models 37325A and below, with Opt 7S: For model 37397A

Performance Verification Software

Connector Verification Kit

For models 37217B and below w/Opt 7A: For models 37217B and below, with Opt 7N or 7NF: For models 37225B and above: For models 37247B and below, with Opt 7S:

For model 37397A

CRITICAL

SPECIFICATION

Any

ANRITSU B39553

ANRITSU 3670A50-2, 3671A50-2 ANRITSU 3670K50-2, 3671K50-2

ANRITSU 3651-1* ANRITSU 3653

ANRITSU 3652-1* ANRITSU 3650-1* ANRITSU 3654B

ANRITSU 2300-237

ANRITSU 3667 ANRITSU 3663 ANRITSU 3668

ANRITSU 3666 ANRITSU 3669B

RECOMMENDED

MANUFACTURER/MODEL

USE*

O, P

O A

O, P,

P, A

O O

O, P

∗ Calibration Kit sliding load (Option {-1}), required for Performance Verification only. ∗∗ USE CODES:

A Adjustment / Internal Hardware Calibration O Operational Testing P Performance Verification T Troubleshooting

1-10 373XXA MM

GENERAL INFORMATION RECOMMENDED TEST EQUIPMENT

Table 1-1. Recommended Test Equipment (2 of 2)

INSTRUMENT

Assurance Air Line For models 37317A and below w/Opt 7A:

For models 37317A and below w/Opt 7N: For models 37317A and below w/Opt 7NF: For models 37317A and above: For models 37317A and below w/Opt 7S:

Offset Termination For models 37317A and below w/Opt 7A, 7N,

7NF: All other models

Frequency Counter Frequency: 0.1 to 26.5 GHz

Input Impedance:50Ω

Digital Multimeter Resolution: 4

DC Accuracy: 0.1 % AC Accuracy: 0.1 %

Oscilloscope Bandwidth: DC to 100 MHz

Sensitivity: 2mV Horiz. Sensitivity: 50 ns/division

Power Meter 1, with: Power Range: –30 to +20 dBm

Other: GPIB controllable

Power Sensor 1

or:

Power Meter 2, with: Power Sensor 2

Power Meter and Power Sensor

Gauging Set GPC-7 Gauging Set

Frequency Range: 0.05 to 50 GHz Power Range: –70 to +47 dBm

Other: GPIB controllable Frequency Range: 0.01 to 40 GHz

Frequency Range: to 65 GHz Anritsu Model ML24xxA Power Meter

K Connector Gauging Set

CRITICAL

SPECIFICATION

digits

(1 mW to 100 mW)

(100 pW to 50 W)

RECOMMENDED

MANUFACTURER/MODEL

ANRITSU 18A50 ANRITSU 18NF50 ANRITSU 18N50 ANRITSU T1519 ANRITSU T1147-2

ANRITSU 29A50-20 ANRITSU 29KF50-15

EIP Microwave, Inc., Model 578B

Any

Tektronix, Inc. Model 2445

HP 437B with Option 22 (GPIB)

HP 8487A Gigatronics 8541 or 8542

Gigatronics 80304A

and MA2474A (40 GHz and below) and Model SC6230 (to 65 GHz) Power Sensors

ANRITSU 01-161 ANRITSU 01-162

USE*

P, A

O, T

∗∗ USE CODES:

A Adjustment / Internal Hardware Calibration O Operational Testing P Performance Verification T Troubleshooting

373XXA MM 1-11

STATIC HANDLING GENERAL INFORMATION

Do not touch exposed contacts on

any static sensitive component.

Wear a static-discharge wristband

when working with static sensitive components.

Do not slide static sensitive compo

nent across any surface.

Label all static sensitive devices.

Do not handle static sensitive com

ponents in areas where the floor or work surface covering is capable of generating a static charge.

Keep component leads shorted to-

gether whenever possible.

Handle PCBs only by their edges.

Do not handle by the edge connec tors.

Lift & handle solid state devices by

their bodies – never by their leads.

Transport and store PCBs and

other static sensitive devices in static-shielded containers.

10. ADDITIONAL PRECAUTIONS:

•

Keep workspaces clean and free of any objects capable of holding or storing a static charge.

•

Connect soldering tools to an earth ground.

•

Use only special anti-static suction or wick-type desoldering tools.

Figure 1-2. Static Sensitive Component Handling Procedures

1-12 373XXA MM

Chapter 2 Replaceable Parts

Table of Contents

Chapter 2 Replaceable Parts

2-1 INTRODUCTION This chapter provides replaceable parts information for all 373XXA

models. The major replaceable 373XXA assemblies and parts are listed in Tables2-2 through 2-8. The locations of these assemblies/parts are shown in Figures 2-1 through 2-4.

2-2 EXCHANGE ASSEMBLY

PROGRAM

ANRITSU maintains a module exchange program for selected subassem blies. If a malfunction occurs in one of these subassemblies, the defective item can be exchanged. Upon receiving your request, ANRITSU will ship the exchange subassembly to you, typically within 24 hours. Y outhen have 45 days in which to return the defective item. All exchange subas semblies or RF assemblies are warranted for 90 days from the date of shipment, or for the balance of the original equipment warranty ,whichever is longer.

NOTE

When sending a failed assembly to the factory for exchange, a copy of the Service Log must always accompany the failed assembly. This copy may be a printout, or a saved disk copy. Due to the importance of the service log information to the ANRITSU factory Service Engineers, the exchange prices are only valid if the service log data is included with the failed assembly.

Please have the exact model number and serial number of your unit available when requesting this service, as the information about your unit is filed according to the instrument’s model and serial number. For more information about the program, contact your local sales rep resentative or call ANRITSU Customer Service direct (refer to para graph 2-4.

2-3 REPLACEABLE

SUBASSEMBLIES AND PARTS

Tables2-2 through 2-5, (starting page 2-5) list the major replaceable sub assemblies and parts for the 373XXA. These assemblies/parts are pres ently covered by the ANRITSU exchange assembly program. Table 2-6 (page 2-6) lists disposable parts for the 373XXA, and Table 2-7 and 2-8 lists factory-repairable parts for the 373XXA. (The parts listed in Tables 2-6 through 2-8 are not presently on the exchange assembly program.)

NOTE

The 373XXA A17 Motherboard PCB Assembly is not a field-replaceable item.

373XXA MM 2-3

PARTS ORDERING INFORMATION REPLACEABLE PARTS

2-4 PARTS ORDERING

INFORMATION

Table 2-1. ANRITSU Service Centers

UNITED STATES

ANRITSU COMPANY 490 Jarvis Drive Morgan Hill, CA 95037-2809 Telephone: (408) 778-2000 FAX: (408) 778-0239

ANRITSU ANRITSU COMPANY 685 Jarvis Drive Morgan Hill, CA 95037-2809 Telephone: (408) 776-8300 FAX: (408) 776-1744

ANRITSU ANRITSU COMPANY 10 Kingsbridge Road Fairfield, NJ 07004 Telephone: (201) 227-8999 FAX: (201) 575-0092

AUSTRALIA

ANRITSU PTY. LTD. Level 2, 410 Church Street North Parramatta NSW 2151 Australia Telephone: 026-30-81-66 Fax: 026-83-68-84

BRAZIL

ANRITSU ANRITSU ELECTRONICA LTDA. Praia de Botafogo, 440-SL 2401-Botafogo 2225-Rio de Janeiro-RJ-Brasil Telephone: 021-28-69-141 Fax: 021-53-71-456

CANADA

ANRITSU ANRITSU INSTRUMENTS LTD. 215 Stafford Road, Unit 102 Nepean, Ontario K2H 9C1 Telephone: (613) 828-4090 FAX: (613) 828-5400

CHINA

ANRITSU BEIJING SERVICE CENTER

All parts listed in T ables2-2 through 2- 8 may be ordered from your local ANRITSU service center (Table2-1). Or ,they may be ordered directly from the factory at the following address:

ANRITSU Company ATTN: Customer Service 490 Jarvis Drive Morgan Hill, CA95037-2809

Telephone: (408)-778-2000 FAX: (408)-778-0239

416W Beijing Fortune Building 5 Dong San Huan Bei Lu Chao Yang Qu, Beijing 100004, China Telephone: 86-1-50-17-559 FAX: 86-1-50-17-558

FRANCE

ANRITSU ANRITSU S.A 9 Avenue du Quebec Zone de Courtaboeuf 91951 Les Ulis Cedex Telephone: 016-44-66-546 FAX: 016-44-61-065

GERMANY

ANRITSU ANRITSU GmbH Rudolf Diesel Strabe 17 8031 Gilching Telephone: 08-10-58-055 FAX: 08-10-51-700

INDIA

MEERA AGENCIES (P) LTD. A-23 Hauz Khas New Delhi 110 016 Telephone: 011-685-3959 FAX: 011-686-6720

ISRAEL

TECH-CENT, LTD Haarad St. No. 7, Ramat Haahayal Tel-Aviv 69701 Telephone: (03) 64-78-563 FAX: (03) 64-78-334

ITALY

ANRITSU ANRITSU Sp.A Roma Office Via E. Vittorini, 129 00144 Roma EUR Telephone: (06) 50-22-666 FAX: (06) 50-22-4252

JAPAN

ANRITSU CORPORATION

1800 Onna Atsugi-shi Kanagawa-Prf. 243 Japan Telephone: 0462-23-1111 FAX: 0462-25-8379

KOREA

ANRITSU CORPORATION #2103 Korea World Trade Center 159-1 Samsung-Dong Kangnam-ku, Seoul Telephone: (02) 551-2250 FAX: (02) 551-4941

SINGAPORE

ANRITSU ANRITSU (SINGAPORE) PTE LTD 3 Shenton Way #24-03 Shenton House Singapore 0106 Telephone: 011-65-2265206 FAX: 011-65-2265207

SWEDEN

ANRITSU ANRITSU AB Box 247 S-127 25 Skarholmen Telephone: (08) 74-05-840 FAX: (08) 71-09-960

TAIWAN

ANRITSU CO., LTD. 8F, No. 96, Section 3 Chien Kuo N. Road Taipei, Taiwan, R.O.C. Telephone: (02) 515-6050 FAX: (02) 509-5519

UNITED KINGDOM

ANRITSU ANRITSU LTD. 200 Capability Green Luton, Bedfordshire LU1 3LU, England Telephone: 05-82-41-88-53 FAX: 05-82-31-303

2-4 373XXA MM

REPLACEABLE PARTS PARTS ORDERING INFORMATION

Table 2-2. Printed Circuit Board Assemblies

Reference

Designator

A1 A1 A2 A3 A4 A4 A5 A6 A7 A7 A8 A8 A9 A13 A14 A15 A16 A18 A19** A20** A21A1 A21A1 A21A2 A21A2 A24

373XXA

Option

LO1 LO1 LO2 Test A IF Reference IF Reference IF A/D TestBIF LO3

Opt 10 LO3

Source Lock/ Separation Control Source Lock/ Separation Control Main Processor I/O #1 I/O #2 Graphics Processor Hard Disk (w/ PCB) Rear Panel PCB Front Panel Switch PCB See Table 2-5 Front Panel Control PCB Source YIG/Bias Control (p/o Signal Source Module) Source YIG/Bias Control (p/o Signal Source Module) Source Control (p/o Signal Source Module) Source Control (p/o Signal Source Module) VME Bus Terminator

Assembly / Part Part Number

D46866-3 D86866-4* D50725-3 D38503-4 D41794-3 D41794-4* D38505-3 D38503-5 D38507-3 D38507-4 D47488-3 D49334-3* B38509 D38513-3 D38514-3 D44281-3 D41041-3 D44255-3

D48516-3 D48512-3* D41841-3 D48513-3* D38524-3

∗ Required for 37397A ∗∗ Part of the Front Panel Assembly (refer to Table 2-5).

373XXA MM 2-5

PARTS ORDERING INFORMATION REPLACEABLE PARTS

Table 2-3. Test Set Assembly RF/Microwave Components, 37317A, 37325A, 37347A, 37369A

Assembly / Part 373XXA Model / Option Part Number

Transfer Switch

Step Attenuator, 70 dB Low Frequency Bridge w/ Bias Tee 37311A,37317A D28985 Coupler w/ Bias Tee 37325A and higher D28967 40 GHz Quad Buffer Amp/Power Amplifier Switched Doubler Module (SDM) Port 2 Step Attenuator 6dBPad 20 dB Pad 20 GHz Quad Buffer Amp/Power Amplifier * Used on serial numbers 975004, 975101, 975103, 980102, 980104, 980201, 980302, 980402, 980403, 980405,

980406, 980407, 980602, 980603, 980701, and above.

Table 2-4. Test Set Assembly RF/Microwave Components, 37397A

Assembly / Part Part Number

Pinswitch 29855 Switched Doubler Module (SDM) 47520 Quadrupler (SQM) 48998 37GHz High Pass Filter 49247 Mux Coupler (Port 1) 49470 Mux Coupler (Port 2) 49480 Shaped Pad 52956 Bias Tee 53409

16.8 GHz Lowpass Filter B28912 Access Loops (Front and Rear Panel) B35569-195 Transfer Switch D27030 3 dB Fixed Attenuator ND26178 Step Attenuator ND52564 Coupler ND52929 Quad Buffer Amplifier/Power Amplifier ND53249

37347A and below

All except 37369A

All

37369A only 37369A only

All

37369A only

D28580-1 46535*

4612K

ND47533 D28685 4612K 43KC-10 43KC-20 ND47532

2-6 373XXA MM

REPLACEABLE PARTS PARTS ORDERING INFORMATION

Table 2-5. Miscellaneous /Integrated Assemblies

Assembly / Part 373XXA Model / Option Part Number

10 MHz Ovenized Oscillator Power Supply Module VGA Monitor Floppy Disk Assy Front Panel Assy (w/ Front Panel, A19 and A20 PCB’s, and all Model

ID Overlays) Fan Assembly, Rear Panel Front Panel Assy (incudes front panel, A19 and A20 PCBs, and all

model ID overlays) Power Supply Liquid Crystal Display (LCD) Liquid Crystal Display (LCD)

Liquid Crystal Display (LCD)

Table 2-6. Consummsable Parts

Opt 10 only

All All All All

All

LCD Equipped

LCD Equipped LCD Equipped LCD Equipped

SN:972701 and above

LCD Equipped

SN:994600 and above

ND39476 40-116 2000-322 C38550 ND42700

B38533 ND44606

40-114 15-88 15-92

15-100

Assembly / Part 373XXA Model / Option Part Number

System Software Front Panel Encoder Knob Front Panel Amber Lens Fuse, 8A, Fast Blow 3AG Cartridge type (F1 Line fuse for power

supply assembly) Battery Backed RAM Back-Up Battery LCD Back Light Driver PCB LCD Back Light Lamp

All All All All

All

All LCD Equipped LCD Equipped

2300-212 2000-577 790-412 631-72

54-1350 633-20 2000-770 632-55

373XXA MM 2-7

PARTS ORDERING INFORMATION REPLACEABLE PARTS

Table 2-7. Signal Source Module RF/Microwave Components

Assembly / Part 373XXA Model / Option Part Number

YIG Oscillator (2 - 20 GHz) Down Converter Switched Filter Switched Filter

Table 2-8. Factory Repairable Non-Exchange Parts

Assembly / Part 373XXA Model / Option Part Number

Test Port Connector, K-Male All 34UK50 Test Port Connector, GPC-7 Opt 7A only 34UA50 Test Port Connector, 3.5 mm Opt 7S only 34US50 Test Port Connector, type N Opt 7N only 34UN50 Test Port Connector, type NF Opt 7NF only 34UNF50 Test Port Connector, V 37397A 34YV50

37317A and below 37325A and above

All All

C21620-1 D27532 D45243 D45244

2-8 373XXA MM

REPLACEABLE PARTS PARTS ORDERING INFORMATION

Ovenized Reference Oscillator

(Option 10 only)

Power

Printed Circuit

Board Assemblies,

A13-A16

Supply

Module

Fan Assembly

VGA Monitor

Assembly

Front PanelAssembly

(Includes Front Panel PCB)

Printed Circuit Board

Assemblies, A1-A9

Signal Source Module

Figure 2-1. Major Assemblies Location Diagram (Top

View)

373XXA MM 2-9

PARTS ORDERING INFORMATION REPLACEABLE PARTS

StepAttenuator

70dB

Transfer

Switch

Power

Amplifier

20/40 GHz

Quad Buffer

Amp/Sampler*

Port 1

Coupler/Bridge*

Switched Doubler

Module**

Port 2 Step

Attenuator

Port 2

Coupler/Bridge*

Floppy Disk Drive

Assembly

A17 Motherboard

PCB Assembly

A24 VME Bus

Terminator

PCB Assembly

Refer to Table2-3

Model 37369A Only

10dB/20dB Pads*

A18 Rear Panel

PCB Assembly

Figure 2-2. Major Assemblies Location Diagram (Bottom View) (Not 37397A)

2-10 373XXA MM

REPLACEABLE PARTS PARTS ORDERING INFORMATION

Port 1 Bias Tee

Port 1 Step Attenuator

Port 1 MUX Coupler

Port 2 MUX Coupler

Transfer Switch

SPDT Switch

Power Amplifier

Port 1 Coupler

Port 2 Step Attenuator

Port 2 Bias Tee

Port 2 Coupler

Floppy Disk Drive Assy

Switched Doubler Module

Port 2 37 GHz Hipass Filter

Port 2 SQM

A17 PCB

Port 1 37 GHz Hipass Filter

Sampler/BufferAmplifier

Shaped Pads

A24 PCB

A18 Rear Panel PCB

Figure 2-3. Major Assemblies Location Diagram (Bottom View) (37397A)

Port 1 SQM

373XXA MM 2-11

PARTS ORDERING INFORMATION REPLACEABLE PARTS

Figure 2-4. Signal Source Parts Location Diagram

2-12 373XXA MM

Chapter 3 Operational Tests

Table of Contents

3-5 SIGNAL PATH ··························3-10

Chapter 3 Operational Tests

3-1 INTRODUCTION The tests in this section provide a means of fully testing the 373XXA VNA

system for proper operation and signal stability. These tests are intended to be used as a periodic check of the operational functionality of the 373XXA.

The tests should be performed in their entirety at least once annually. Although there is no requirement to do so, the tests should generally be run in the sequence presented.

NOTE

The procedures presented in Chapter 4, Performance Verification, provide the means to test the accuracy of the tests performed by the 373XXA.

Please ensure you have read and fully understand the servicing concepts for the 373XXApresented in Chapter 1 prior to continuing with this chapter.

Operational Tests for the 373XXA consist of the following:

Checking the Service Log

Self Test

Peripherals and Interface Testing

Signal Path Tests (includes Checking the Service Log and Self Test.)

These tests are described in paragraphs 3-2 through 3-5, which start on the next page.

373XXA MM 3-3

CHECKING THE SERVICE LOG OPERATIONAL TESTS

3-2 CHECKING THE

SERVICE LOG

OPTIONS

TRIGGERS REAR PANEL

OUTPUT

DIAGNOSTICS

MULTIPLE SOURCE CONTROL

PRESS <ENTER> TO

SELECT

START SELF TEST

READ SERVICE LOG

INSTALLED OPTIONS PERIPHERAL TESTS TROUBLESHOOTING

(FOR SERVICE ONLY)

HW CALIBRATIONS (FOR SERVICE ONLY)

PRESS <ENTER>

DIAGNOSTICS

TO SELECT

Checking the service log consists of viewing the entries written into the log.

CAUTION

The service log contains historical information about in strument condition and any failures that may have oc

curred. It should be cleared only by a qualified service engineer. Such clearing shuld be accomplished only upon determining that the errors need not be saved to disk, or printed out for service purposes.

Procedure: Step 1. Press the Option Menu key (Enhancement key group) to dis

play the OPTIONS menu.

Step 2.

Select DIAGNOSTICS from menu (left); then select READ SERVICE LOG from the DIAGNOSTICS menu.

The 373XXA will now display the contents of the service log. The display consists of a header and an error listing. The header contains a variety of system service information. The error listing contains error messages for failures that may have occurred during operation.

NOTE

• Errors 7201–7209, GPIB remote operation programming errors, report that one or more external GPIB programming er

rors has been detected. These messages do not indicate a 373XXA system fault.

•

Informational messages 0000–0099 report the pass/fail status of a peripheral access. These messages do not indicate a 373XXA system fault.

Any other error messages in the service log may indicate an instrument problem and should be investigated. Refer to the Chapter 5, Troubleshooting, for further information.

CAUTION

The CLEAR SERVICE LOG menu selec

tion will immediately and permanently clear all the error message entries from the ser

vice log. (However, it will not clear the header information.) See Caution message at top of page.

3-4 373XXA MM

OPERATIONAL TESTS SELF TEST

3-3 SELF TEST The self test performs a series of tests that verify that various internal

373XXAcircuits are functional and operating properly.

To start the self test: Step 1. Press the Option Menu key (Enhancement key group) to dis

play the OPTIONS menu.

Step 2.

Select DIAGNOSTICS from menu; then select START SELF TEST (below).

OPTIONS

TRIGGERS REAR PANEL

OUTPUT

DIAGNOSTICS

MULTIPLE SOURCE CONTROL

PRESS <ENTER> TO

SELECT

DIAGNOSTICS

START SELF TEST

READ SERVICE LOG INSTALLED OPTIONS PERIPHERAL TESTS TROUBLESHOOTING

(FOR SERVICE ONLY)

HW CALIBRATIONS (FOR SERVICE ONLY)

PRESS <ENTER> TO

SELECT

Step 3. Wait for test sequence to complete. (Once invoked, this test

requires no user interaction or external equipment.)

Upon completion, the net pass/fail result of the self test is shown on the CRT display. If the 373XXA is in remote-only operation, the re

sults are reported via the GPIB output buffer. If the self test fails, de tailed error messages will be written into the service log.

If self test fails:

Check the service log to view failure messages.

Proceed to Chapter 5, Troubleshooting.

373XXA MM 3-5

PERIPHERALS AND INTERFACES OPERATIONAL TESTS

3-4 PERIPHERALS AND

INTERFACES

LCD Test This test verifies that the 373XXALCD is functioning correctly.

These tests are used to verify the operation of the liquid-crystal display (LCD), front panel keys, and peripheral devices that are used with the 373XXA. They consist of the following:

LCD Test

Front Panel Test

External Keyboard Interface Test

Printer Interface Test

GPIB Interface Test

NOTE

The External VGAOut Connector can also be tested when using this procedure if an external VGA monitor is con

nected.

Procedure: Step 1. Press the Option Menu key (Enhancement key group) to dis-

play the OPTIONS menu.

Step 2.

Select DIAGNOSTICS from menu; then in sequence select: PERIPHERAL TESTS, and then CRT DISPLAY. See diagram below.

OPTIONS

TRIGGERS REAR PANEL

OUTPUT

DIAGNOSTICS

MULTIPLE SOURCE CONTROL

PRESS <ENTER> TO

SELECT

DIAGNOSTICS

START SELF TEST READ SERVICE LOG INSTALLED OPTIONS

PERIPHERAL TESTS

TROUBLESHOOTING (FOR SERVICE ONLY)

HW CALIBRATIONS (FOR SERVICE ONLY)

PRESS <ENTER> TO

SELECT

Step 3. Follow instructions on the CRT screen until test is com

PERIPHERAL TESTS

CRT DISPLAY

FRONT PANEL EXTERNAL KEY

BOARD PRINTER INTERFACE GPIB INTERFACE PREVIOUS MENU

PRESS <ENTER> TO

SELECT

pleted.

If test fails, proceed to Chapter 5, Troubleshooting.

3-6 373XXA MM

OPERATIONAL TESTS PERIPHERALS AND INTERFACES

Front Panel Test This test verifies that the control keys in each of the 373XXA key groups

are functioning correctly .

Procedure:

External Keyboard

Interface Test

Step 1. Press the Option Menu key (Enhancement key group) to dis

play the OPTIONS menu.

Step 2.

Select DIAGNOSTICS from menu; then in sequence se

lect: PERIPHERAL TESTS, and then FRONT PANEL. See diagram below.

OPTIONS

TRIGGERS REAR PANEL

OUTPUT

DIAGNOSTICS

MULTIPLE SOURCE CONTROL

PRESS <ENTER> TO

SELECT

DIAGNOSTICS

START SELF TEST READ SERVICE LOG INSTALLED OPTIONS

PERIPHERAL TESTS

TROUBLESHOOTING (FOR SERVICE ONLY)

HW CALIBRATIONS (FOR SERVICE ONLY)

PRESS <ENTER> TO

SELECT

PERIPHERAL TESTS

CRT DISPLAY

FRONT PANEL EXTERNAL KEY

BOARD

PRINTER INTERFACE GPIB INTERFACE PREVIOUS MENU

PRESS <ENTER> TO

SELECT

Step 3. Follow instructions on the screen until test is completed. If test fails, proceed to Chapter 5, Troubleshooting. This test verifies that the 373XXA external keyboard interface is func

tioning correctly.

Equipment Required:

An IBM compatible keyboard is required for this test.

Procedure: Step 1. Press the Option Menu key (Enhancement key group) to dis

play the OPTIONS menu.

Step 2.

Select DIAGNOSTICS from menu; then in sequence se

lect: PERIPHERAL TESTS, and then EXTERNAL KEY BOARD. See diagram above.

Step 3. Follow instructions on the screen until test is completed. If test fails, proceed to Chapter 5, Troubleshooting.

Printer Interface Test This test verifies that the 373XXAprinter interface is functioning cor

rectly.

373XXA MM 3-7

PERIPHERALS AND INTERFACES OPERATIONAL TESTS

Equipment Required:

Printer Test Fixture (ANRITSU PN: B39553)

Procedure: Step 1. Press the Option Menu key (Enhancement key group) to dis

play the OPTIONS menu.

Step 2.

Select DIAGNOSTICS from menu; then in sequence se lect: PERIPHERAL TESTS, and then PRINTER IN

TERFACE. See diagram below.

OPTIONS

TRIGGERS REAR PANEL

OUTPUT

DIAGNOSTICS

MULTIPLE SOURCE CONTROL

PRESS <ENTER> TO

SELECT

DIAGNOSTICS

START SELF TEST READ SERVICE LOG INSTALLED OPTIONS

PERIPHERAL TESTS

TROUBLESHOOTING (FOR SERVICE ONLY)

HW CALIBRATIONS (FOR SERVICE ONLY)

PRESS <ENTER> TO

SELECT

PERIPHERAL TESTS

CRT DISPLAY FRONT PANEL EXTERNAL KEY

BOARD

PRINTER INTERFACE

GPIB INTERFACE PREVIOUS MENU

PRESS <ENTER> TO

SELECT

Step 3. Follow instructions on the screen until test is completed. If test fails, proceed to Chapter 5, Troubleshooting.

3-8 373XXA MM

OPERATIONAL TESTS PERIPHERALS AND INTERFACES

GPIB Interface Test This test verifies that the 373XXAprinter interface is functioning cor

rectly.

Equipment Required:

GPIB cable (ANRITSU PN: 2100-2), or equivalent

CAUTION

Insure that no other cables are connected to either of the two rear panel GPIB ports when performing this test.

Procedure: Step 1. Press the Option Menu key (Enhancement key group) to dis

play the OPTIONS menu.

Step 2.

Select DIAGNOSTICS from menu; then in sequence se lect: PERIPHERAL TESTS, and then GPIB INTER FACE. See diagram below.

OPTIONS

TRIGGERS REAR PANEL

OUTPUT

DIAGNOSTICS

MULTIPLE SOURCE CONTROL

PRESS <ENTER> TO

SELECT

DIAGNOSTICS

START SELF TEST READ SERVICE LOG INSTALLED OPTIONS

PERIPHERAL TESTS

TROUBLESHOOTING (FOR SERVICE ONLY)

HW CALIBRATIONS (FOR SERVICE ONLY)

PRESS <ENTER> TO

SELECT

PERIPHERAL TESTS

CRT DISPLAY FRONT PANEL EXTERNAL KEY-

BOARD PRINTER INTERFACE

GPIB INTERFACE

PREVIOUS MENU

PRESS <ENTER> TO

SELECT

Step 3. Follow instructions on the screen until test is completed. If test fails, proceed to Chapter 5, Troubleshooting.

373XXA MM 3-9

SIGNAL PATH OPERATIONAL TESTS

3-5 SIGNAL PATH These are a series of automated tests designed to insure the 373XXA in

ternal signal paths are functioning properly and are capable of support ing stable calibrations and measurements. These test are performed us ing a software test program and an external computer/controller.

The test software performs the following operations and tests:

Service Log Check

Self Test

Basic Sweep Operation and Speed Test

High Level Noise Test

System Stability Test

RF Power Generation and Control Test

Step Attenuators Accuracy and Repeatability Test

Video IF Bandwidth Filters Operation Test

Sampler Efficiency and Stability Test

LO1/LO2 Linearity Test

q Source FM/Lock Signal Linearity Test

Equipment required:

37XXX Test Software (ANRITSU PN: 2300-178) External computer/controller; refer to Table 1-1 located on page 1-9. GPIB cable (ANRITSU PN: 2100-2), or equivalent

Procedure: Step 1.

Refer

to file “Readme.txt” of the distribution disk for in

formation regarding setup of the computer/controller.

Step 2. Using the GPIB cable, connect the external computer/con

troller to the IEEE 488.2 GPIB Interface port on the 373XXA rear panel.

Step 3. Program may be run from floppy disk or copied to any

folder in the computer and run from there.

Step 4. Peform Non-Ratio and Transmission tests. If any tests fail, refer to the Troubleshooting and Help selections of the

Test Software menu for assistance.

3-10 373XXA MM

Chapter 4 Performance Verification

Table of Contents

4-1 INTRODUCTION ·························4-3 4-2 CALIBRATION AND MEASUREMENT CONDITIONS ····4-3

Standard Conditions························4-3 Special Precautions: ························4-4

4-3 MEASUREMENT ACCURACY··················4-4

Verification Software ·······················4-4

Verification Result Determination ················4-5 4-4 VERIFICATION PROCEDURE··················4-5 4-5 KEY SYSTEM PARAMETERS ·················4-6

Measurement Environment Considerations ···········4-6

Measurement Technique ·····················4-7

373XXA MM 4-1

4-2 373XXA MM

Chapter 4 Performance Verification

4-1 INTRODUCTION This chapter provides specific procedures to be used to verify that the

373XXAis making accurate, traceable S-parameter measurements. You should perform the verification procedures in paragraph 4-3, “Verifying Measurement Accuracy,”at least once annually.

Additionally, this chapter includes procedures that may be used to measure the following key system performance parameters:

Effective Source Match

Effective Directivity

System Dynamic Range

Frequency Accuracy

Power Level Accuracy

The Operational Tests described in Chapter 3 should be performed prior to verifying system performance.

4-2 CALIBRATION AND

MEASUREMENT CONDITIONS

Standard Conditions The standard conditions specified below must be observed when perform

Please ensure you have read and fully understand the servicing concepts for the 373XXApresented in Chapter 1 prior to continuing with this chapter.

Extremes in the surrounding environmental conditions and the condition and stability of the test port connectors, through-cable, and calibration kit determine system measurement integrity to a large extent.

These are all user controlled conditions, and as such, should be evalu ated periodically for impact on system performance. If these conditions vary significantly with time, the system verification procedures should be performed more often than the recommended annual cycle.

ing any of the operations in this chapter — both during calibration and during measurement.

Warm-up Time: One hour minimum. Environmental Conditions:

Temperature: 23 +/- 3 deg C Relative Humidity: 20-50% recommended.

373XXA MM 4-3

MEASUREMENT ACCURACY PERFORMANCE VERIFICATION

Error Correction: Perform software-guided 12 term calibration.

Special Precautions: When performing the procedures in this chapter ,observe the following

precautions:

4-3 MEASUREMENT

ACCURACY

Verification Software These procedures use the ANRITSU VNA Verification Software, PN:

Minimize vibration and movement of system and attached compo

nents and through-cable. Clean and check pin depth and condition of all adapters,

through-cable(s), and calibration components. Pre-shape the through-cable(s) so as to minimize its movement dur

ing calibration and measurement activities. Ensure the system remains motion free in stable environmental

conditions as defined above throughout warm-up, calibration, and measurement activities.

The verification procedures described in the following paragraphs verify the published measurement accuracy and measurement traceability* for the 373XXA.

2300-237, and the NIST traceable impedance transfer standards contained in the appropriate ANRITSU Verification Kit. The Standard Conditions and Special Precautions described in paragraph 4-2 should be observed when performing these procedures.

The appropriate ANRITSU Verification Kit to be used for performing these procedures is model dependent, as follows:

Models 37317A and below, with Opt 7A: Verification Kit 3667

All Models using K Connector test ports: Verification Kit 3668

Models 37397A: Verification Kit 3669B

The impedance transfer standards contained in these kits are:

20 dB Attenuation Standard

50 dB Attenuation Standard

50 Ohm Air Line Standard

25 Ohm Mismatch (Beatty) Standard

The verification software performs the following functions:

It guides the user through a full 12 Term calibration of the 373XXA.

It guides the user through the measurement of the S-parameters of the NIST traceable impedance transfer standards (below).

It verifies the measured values are within the specified measure

ment uncertainty limits.

It indicates the pass/fail status of the measurements on the CRT display. It can also provide a hard copy printout of the measured

∗ Traceability to the U.S. National Institute of Standards and Technology (NIST)

4-4 373XXA MM

PERFORMANCE VERIFICATION VERIFICATION PROCEDURE

Verification Result

Determination

data, measurement uncertainties, and the impedance transfer stan dards used.

NOTE

The total verification uncertainty in these 373XXA measurements includes the mea surement uncertainty of the verification standards and the 373XXAmeasurement uncertainty.

The software verification process compares the measured S-parameter data of the impedance transfer standards against the original standard data for those devices that was obtained using the Factory Standard 360 Vector Network Analyzer System (at ANRITSU). The factory Standard 360 system is traceable to NIST through the ANRITSU Calibration Labo ratory’s Impedance Standards. These standards are traceable to NIST through precision mechanical measurements, NIST approved microwave theory impedance derivation methods, and electrical impedance compari son measurements.

The quality of the verification results is very dependent on the degree of care taken by the user in maintaining, calibrating, and using the system. The most critical factors are:

The stability and quality of the devices in the calibration and verification kits.

The condition of 373XXAtest port connectors and through-cables.

The pin depths of all connectors, and the proper torquing of connections. These same factors also affect 373XXA measurement quality.

4-4 VERIFICATION

PROCEDURE

Consult the Operating Manuals supplied with the ANRITSU Calibra tion and Verification Kits for proper use, care, and maintenance of the devices contained in these kits.

The performance verification procedure for the ANRITSU 373XXAVNA is described below.Refer also to the Model 360X/37XXX VNA Perfor mance Verification Software Users Guide, P/N: 10410-00162, which is lo cated in Appendix E at the rear of this manual. This Software Users Guide explains in detail the procedures to be used for the installation and operation of the V erificationSoftware on your computer/controller.

Equipment required:

ANRITSU 37300A Verification Software, PN: 2300-237 (Version 3.1 or above of 2300-237 software is necessary to verify the 37397A).

External computer/controller; refer to Table 1-1 located on page 1-9.

373XXA MM 4-5

KEY SYSTEM PARAMETERS PERFORMANCE VERIFICATION

ANRITSU Verification Kit appropriate for the 373XXA model; refer to paragraph 4-3.

GPIB cable (ANRITSU PN: 2100-2), or equivalent

Procedure:

4-5 KEY SYSTEM

PARAMETERS

Step 1. Using the GPIB cable, connect the external computer/con

troller to the IEEE 488.2 GPIB Interface port on the 373XXA rear panel.

Step 2. Insert the CD ROM into its drive and install the 2300-237

software.

Step 3. Follow the directions displayed on the computer screen to

perform all tests. If the calibration fails, check the connectors of the calibra

tion kit devices and the impedance transfer standards for damage, cleanliness, and proper connection and torquing. These are the most common causes for verification failures.

If the problem persists, check system Directivity, Match, and Dynamic Range, as described in the next paragraph.

The following paragraphs describe procedures for automated measurement of the key system performance parameters listed below. Measurement of these parameters is not required for system verification; however, it is highly recommended to ensure that the complete 373XXA measurement environment is stable and capable of supporting accurate measure ments.

Effective Source Match

Effective Directivity

System Dynamic Range

Frequency Accuracy

Power Level Accuracy

Measurement

Environment

Considerations

As with the verification procedures, the quality of the measurement of the system performance parameters listed above is very dependent on the measurement environment.

The complete 373XXAmeasurement environment consists of:

Condition and stability of the test ports, through-cable, and calibra tion kit mating connectors.

Settings and stability of the surrounding environment, especially temperature, humidity, and vibration. To maintain the highest sys tem performance, avoid changing these conditions, especially tem

4-6 373XXA MM

PERFORMANCE VERIFICATION KEY SYSTEM PARAMETERS

Measurement

Technique

perature, during warm-up, calibration, and when making measure ments on your DUT. The use of proper microwave connector mating techniques.

The measurements of the key system performance parameters are per

formed using the ANRITSU 37XXX Test Software, PN: 2300-178.

NOTE

The Standard Conditions and Special Precautions de scribed in paragraph 4-2 should be observed when per

forming these measurements.

The software will use the following standards to determine system per formance values:

Assurance Air Line Set

Offset Termination

Frequency Counter

Power Meter

Equipment required:

37XXX Test Software (ANRITSU PN: 2300-178) External computer/controller; refer to Table 1-1 located on page 1-9. GPIB cable (ANRITSU PN: 2100-2), or equivalent

Measurement Procedure: Step 1.

Refer

to file “Readme.txt” of the distribution disk for in-

formation regarding setup of the computer/controller.

Step 2. Using the GPIB cable, connect the external computer/con

troller to the the 373XXA IEEE 488.2 GPIB rear panel con nector.

Step 3. Program may be run from floppy disk or copied to any

folder in the computer and run from there.

Step 4. Follow the directions displayed on the computer screen to

perform all tests.

NOTE

Some tests require that the first test selected must be the 12-Term Calibration. The software will guide you through this calibration.

If any tests fail, refer to the Troubleshooting and Help se lections of the Test Software menu for assistance.

373XXA MM 4-7/4-8

Chapter 5 Troubleshooting

Table of Contents

5-5 SYSTEM DOES NOT BOOT-UP ·················5-7

5-6 SYSTEM HAS ERROR CODE ·················5-10

Phase Lock Error Codes (6000 Series)··············5-11 Service Log Snap Shot Data ···················5-12

5-7 SOURCE/TEST SET/RECEIVER ················5-17

5-8 PERIPHERALS/ INTERFACE ·················5-21

5-9 MEASUREMENT IN QUESTION················5-22

Measurement Conditions Check List ··············5-23

Many of the troubleshooting procedures presented in this chapter re quire the removal of instrument covers to gain access to printed cir cuit assemblies and other major assemblies.

WARNING

Hazardous voltages are present inside the instru

ment when ac line power is connected. Turn off the instrument and remove the line cord before removing any covers or panels. Trouble shooting or repair procedures should only be performed by service personnel who are fully aware of the potential hazards.

CAUTION

Many assemblies in the 373XXA contain static-sensitive components. Improper handling of these assemblies may result in damage to the assemblies. Always observe the static-sensitive component handling precautions described in Chapter 1, Figure 1-2.

CAUTION

Never operate the 373XXAwith connector J3 of the A21A2 Source Control PCB disconnected. Operation in this mode may cause damage the A31 Buffer Amplifier/Sampler assembly.

Chapter 5 Troubleshooting

5-1 INTRODUCTION This chapter provides specific procedures to be followed when trouble

shooting 373XXA VNAsystems. While performing these procedures, al ways observe the warnings and cautions on the opposite page.

To use the troubleshooting procedures in this chapter:

1. Select the paragraph heading (starting with paragraph 5-4) that best describes the nature of the 373XXA VNA system fault. Refer to the Table of Contents page.

2. Perform the procedure contained in the selected paragraph. In general, the steps within each procedure should be followed in the order presented.

3. When removing and replacing the various assemblies and components specified by the troubleshooting procedures in this chapter, refer to Chapter 8, Remove and Replace Procedures, as necessary.

4. If a step cannot be successfully completed, stop; correct the immediate problem, and then continue on to the next step until all the appropriate steps in the procedure are completed.

5. After troubleshooting and correcting a problem, perform the pro cedures in Chapter 3, (Operational Tests) and Chapter 4 (Perfor mance Verification), as appropriate. This should be done to insure that the system has been fully and correctly restored to proper op eration.

The procedures described in this chapter provide a general approach

5-2 ASSOCIATED

INFORMATION IN THIS MANUAL

to troubleshooting 373XXAVNA problems. They are particularly use ful for problems where the 373XXA is only partially functional. The In ternal Diagnostic Menus described in Appendix A are very useful for evaluating 373XXA system performance. They may be used alone, or in conjunction with the procedures in this chapter.

Please ensure you have read and fully understand the servicing con cepts for the 373XXApresented in Chapter 1 prior to continuing with this chapter.

While using the troubleshooting procedures in this chapter ,refer also the the following information:

373XXA MM 5-3

RECOMMENDED TEST EQUIPMENT TROUBLESHOOTING

5-3 RECOMMENDED TEST

EQUIPMENT

5-4 SYSTEM DOES NOT

POWER-UP

Line Source and

Interface Checks

Appendix A, Diagnostics Menus, fully describes the 373XXA Di

agnostics menu tree, including the SERVICE LOG menu. Appendix B, Error Codes and Messages, for details on each of the

373XXA hardware related error messages. Chapter 6, System Description, for a brief technical description of

the 373XXA VNA system operation.

The recommended test equipment for the troubleshooting procedures pre sented in this chapter is listed in Chapter 1, Table 1-1 (page 1-9).

If the 373XXA does not power-up when connected to a source of AC power and the Power key is pressed, perform the power supply checks described below.

WARNING

Hazardous voltages are present inside the instrument when ac line power is connected. Turn off the instrument and remove the line cord before removing any covers or panels. Troubleshooting or repair procedures should only be performed by service personnel who are fully aware of the potential hazards.

Check as follows:

Step 1. Verify that the AC power source is providing stable power

at the correct line voltage.

NOTE

The 373XXA is designed to automatically

Power Supply

Voltages Check

sense and operate with AC power line volt ages in the range of 85 - 240 VAC, with a frequency of 48 - 63 Hz (540 VA maximum).

Step 2. Verify that the power input cord is in good condition. Step 3. ensure that the system power line fuse is installed, that it

is not open, and that it is the correct value (8 A, Slow Blow).

Verify that the 373XXA power supply voltages are correct as follows:

Step 1.

Press the 373XXAPower key off, and and disconnect the power input cord from the 373XXA. ensure all external con nections to the system front and rear panel are also discon nected.

5-4 373XXA MM

TROUBLESHOOTING SYSTEM DOES NOT POWER-UP

Step 2. Remove bottom panel, and lay the system down on its left

(monitor) side. Refer to Chapter 8, Remove and Replace Procedures.

Step 3. Reconnect the power line input cord to the system and

Press the 373XXAPower key on.

Step 4. Using a DMM or an oscilloscope, measure the DC power

supply voltages listed in Table 5-1. Connect the DMM/oscilloscope to the top of the cable connectors at J13 and J4 on the Motherboard (A17). Refer to Figure 5-1 and Table 5-1.

Table 5-1. 373XXA DC Power Supply Voltage Checks

Connect To:

DC Supply Voltage

Conn Com (Pin) Meas (Pin)

J13 8 16 0 Vdc

AC Ripple and

Noise

50 mVpp

J13 8 1 +4.8 Vdc +1% / –0% 50 mVpp

J4 4 1 +9 Vdc +5% / –0% 100 mVpp J4 4 6 +18 Vdc +10% / –0% 100 mVpp J4 4 10 –18 Vdc +10% / –0% 100 mVpp J4 4 12 +27 Vdc +5% / –0% 100 mVpp J4 4 14 –27 Vdc +5% / –0% 100 mVpp

372XXA A17 Motherboard D38517-3

(shown upside down)

J13

Figure 5-1. Location of Connectors for Power Supply Voltage Checks

373XXA MM 5-5

SYSTEM DOES NOT POWER-UP TROUBLESHOOTING

Step 5. Connect the common lead of the oscilloscope to J13, pin 8.

Measure the Power Supply Sync signal (PS_SYNC) on J13, pin 14:

Specification: 2-4 vpp Sine Wave at 109.89 KHz

NOTE

The power supply module will power-up without the PS_SYNC signal being present. However, the lack of this signal will introduce signal purity problems when the sys tem is performing measurements.

Power Supply Module

Check

If any of the DC voltage tests fail, verify that the power supply module is operating properly with minimal impact from the system as described in the procedures below.

NOTE

If a power supply voltage is low, it may be due to excessive current draw from the system and not a fault in the power supply.

Steps 1 through 4 verify the operation of the + 9, ±18, and ±27 Vdc supplies:

Step 1.

Step 2. Disconnect the power supply module from the A17 Mother-

Step 3. Reconnect the power line input cord to the system and

Step 4. Using a DMM and/or an oscilloscope, measure the power

Press the 373XXAPower key off, and and disconnect the power input cord.

board at J4.

press the 373XXAPower key on.

supply voltages at the power supply connector pins that correspond to the Motherboard pins for the + 9, ±18, and ±27 Vdc supplies. Refer to Table 5-1 and Figure 5-1 (previ ous page).

Steps 5 through 8 check the +5 volt supply. This power supply re quires at least a 10% load to turn on. Therefore, at least one of the dig ital PCBs A9, A13, or A14 (which use the 5 volt supply) must be in stalled in the system during this procedure.

Step 5.

Step 6. Unplug digital PCB’s A13 and A14. Step 7.

Press the 373XXAPower key off, and reconnect the power supply module to the Motherboard at J4.

Press the 373XXAPower key on.

5-6 373XXA MM

TROUBLESHOOTING SYSTEM DOES NOT BOOT-UP

Step 8. Using a DMM and/or an oscilloscope, measure the +5 volt

power supply at connector J13 on the Motherboard. Refer to Figure 5-1 and Table 5-1, (page 505).

5-5 SYSTEM DOES NOT

BOOT-UP

Step 9.

If any of the DC voltage tests fail in steps 1 through 8 above, replace the power supply module.

If any of the DC voltage tests fail with the power supply module con nected to the 373XXAMotherboard — but pass with it disconnected — then the most probable cause of the failure is that one of the 373XXA assemblies is demanding an excessive amount of current. To locate the failed assembly:

Press the 373XXAPower key off, and unplug a single assembly.

Press the 373XXAPower key on, and note if the failed power supply functions normally.

3. Repeat Steps 1 and 2 until an assembly is found that clears the power supply failure. The removed assembly is suspect and should be replaced.

If the 373XXA does not boot-up when it is powered-up, perform the checks described below.

Press the 373XXAPower key off, and and reinstall the A13 and A14 PCB’s removed in Step 6.

Boot-up Process

Sequence

The boot-up process is controlled by the firmware located on the A9 PCB assembly (processor PROM) The boot-up activities include:

Testing and initializing the A9 Main Processor PCB

Testing communication between the A9 PCB and the digital PCB assemblies (A13, A14, A15, A16). The following messages will be displayed at this juncture:

Initializing front panel knob (A14/A20)....

Initializing GPIB (A13/A18)....

Initializing external keyboard (A13)....

Initializing external trigger (A13/A5)....

Initializing front panel (A14/A20)....

Loading of system software from disk into memory

Starting operation of the system software.

System is booting—message is displayed.

373XXA MM 5-7

SYSTEM DOES NOT BOOT-UP TROUBLESHOOTING

At this point, the system software continues the boot-up process by performing the following activities:

Issues command to A15 PCB to change display from TEXT mode

to GRAPHIC mode and display ANRITSU logo. Performs basic communication tests between the digital system

(A13, etc.) and the analog subsystem (A1-A8, A21A1, A21A2); this is part of a minimal self test.

Conducts an IF Calibration

Resets and loads the front panel state that was in effect prior to

the last power down Starts the measurement process

NOTE

The system software fully controls the 373XXA VNA sys tem after boot-up (with operator intervention and guid ance). The system software is only loaded once upon initial power up.

Troubleshooting

Boot-up Problems

To start the troubleshooting of boot-up related problems, perform the following preliminary checks:

1. Note any error messages displayed on the CRT display during the boot-up process.

2. Observe the front panel and the display during the boot-up process for information as to which part of the process failed or did not execute.

3. Verify that the system power supplies are working properly as per paragraph 5-4, above. Note particularly the operation of power supplies immediately after power-up.

4. Try to boot the instrument from the floppy disk and repeat steps 1 and 2 above.

Upon completion of the preliminary checks (above), perform the fol

lowing procedures, as appropriate.

Hard Disk Problem 1 If a hard disk problem is indicated during bootup from a floppy disk, but

the system can bootup correctly from the hard disk: Step 1. Boot up from the hard disk, then format the Hard Disk us

ing the procedure below.

CAUTION

Formatting the hard disk will erase all files on the hard disk. Before starting the disk formatting process, copy any files you wish to save to a floppy disk.

5-8 373XXA MM

TROUBLESHOOTING SYSTEM DOES NOT BOOT-UP

Step 2. Press the Utility Menu key (System State key group) to dis

play the UTILITY FUNCTIONS OPTIONS menu. From menu, select GENERAL DISK UTILITIES (see below).

SELECT UTILITY

FUNCTION OPTIONS

GPIB ADDRESSES DISPLAY

INSTRUMENT STATE PARAMS

GENERAL DISK UTILITIES

CALIBRATION COMPONENT UTILITIES

PRESS <ENTER> TO

Step 3.

SELECT

If FLOPPY DISK UTILITIES menu appears, select

FLOPPY DISK

UTILITIES

DISPLAY DIRECTORY

DELETE FILES COPY FILES

TO HARD DISK FORMAT

FLOPPY DISK

HARD DISK UTILITIES

PRESS <ENTER> TO

SELECT

HARD DISK

UTILITIES

DISPLAY DIRECTORY

DELETE FILES COPY FILES

TO HARD DISK

FORMAT HARD DISK

FLOPPY DISK UTILITIES

PRESS <ENTER> TO

SELECT

HARD DISK UTILITIES.

Step 4.

From HARD DISK UTILITIES menu, select FORMAT HARD DISK.

Step 5. After formatting is complete, reload System Software from

the master floppy diskettes. Retry boot-up. If fail, contact ANRITSU Customer Service Center.

Hard Disk Problem 2 If system does not bootup from hard disk and floppy disk:

Step 1. When the five initializing messages are displayed after

power on, press any key within 2 seconds.

Step 2. Follow the instruction on the display to format the hard

drive. After formatting is complete, reinstall system soft ware from the master floppy diskettes. Retry boot-up.

Step 3. If fails, replace the A16 Hard Disk PCB; reinstall system

software from the master floppy diskettes.

Step 4. Retry boot-up. If fail, contact ANRITSU Customer Service

Center.

Floppy Disk Problems If a floppy disk problem is indicated during bootup from floppy disk but

the system is able to bootup from the hard disk: Step 1. Ensure the floppy disk media is in good condition Step 2. Verify disk drive connection at Motherboard connector J2.

Step 3. Retry boot-up. If fail, replace the A13 - I/O#1 PCB.

373XXA MM 5-9

SYSTEM HAS ERROR CODE TROUBLESHOOTING

Step 4. Retry boot-up. If fail, replace the Floppy Disk Drive.

Screen Display

Problems

Check 1: If during boot-up the 373XXA does not attempt to display any mes-

If the 373XXA system appears to have no screen display, perform the preliminary check below and then perform checks1-3,asappropriate:

Preliminary Check - Press the 373XXA Power key off and then on sev eral times. Each time power is reapplied, pause and wait for the 373XXA software system to boot-up. During boot-up, observe the top left hand portion of the CRT display.

NOTE

An alternative method to reset and re-boot the software system is to press the red button on the A9 Main Processor PCB. Observe the messages displayed on the screen dur ing the boot-up process. Verify that the following messages are present :

n Initializing front panel knob (A14/A20)....

n Initializing GPIB (A13/A18)....

n Initializing external keyboard (A13)....

n Initializing external trigger (A13/A5)....

sages at all, proceed as follows:

Check 2: If the system halts before it completes all five digital sections, process

5-6 SYSTEM HAS ERROR

CODE

Step 1. Replace the A15 Graphics Processor PCB. Step 2. Retry boot-up. If fail, replace the Internal VGA Monitor. Step 3. Retry boot-up. If fail, replace the A9, Main Processor PCB. Step 4. Retry boot-up. If fail, contact ANRITSU Customer Service

Center.

as follows: Step 1. Replace the PCB indicated on the last displayed message.

Example: If the system halt at the “Initializing front panel

knob (A14/A20)....,” replace the A14 and A20 PCBs.

Step 2. Retry to boot the system. If it still fails, contact ANRITSU

Customer Service.

If the 373XXA detects a problem during normal operation, an error mes sage consisting of an error code followed by a brief error message will be displayed on the screen. The error code will also be written to the service log along with some of the operating data gathered from the system at the time of failure.

5-10 373XXA MM

TROUBLESHOOTING SYSTEM HAS ERROR CODE

System error codes in the range 0100 - 3999 identify the suspected failed subassembly in the two most-significant digits of the error code. For example: error codes 0200 - 0299 are related to the A2, LO2 PCB assembly. This error code assignment scheme allows for quick identifi cation of suspect assemblies.

NOTE

Refer to Appendix B, Error Codes/Messages, for a list of the error codes/messages for 37300AVNA systems.

There are cases when a fault on one assembly will cause a different as sembly to be identified as faulty (per the error code designated). This happens when a failure occurs on an assembly that provides a stimu lus or a calibration signal to other assemblies in the system. Example: the A7 LO3 PCB provides the IF Calibration signal to the A3, A4, and A6 PCB’s. If the IF Cal signal is faulty, error codes will be reported for the A3, A4, A6, and A7 PCB’s.

NOTE

An aide to troubleshooting system failures using error codes is a good understanding of system and subassembly operation. Refer to the descriptions of system and subassembly operation and block diagrams located in Chapter 7, System Description.

Self TestError Codes Error codes 0100 - 3999, with few exceptions, are produced as a result

of a failure when the system self test is run. These error codes will not be displayed on the CRT screen. Only the overall result of the self test (PASS/FAIL) will be displayed at the conclusion of the self test. How ever, any error codes due to the self test will be written to the service log as the self test is executed.

NOTE

The exceptions are error codes with 00 in the two least-significant digits, for example: 0500 A/D CONVER SION FAIL. These errors are produced at run time if a problem is encountered when the system is actively mak ing measurements.

Phase Lock Error

Codes (6000 Series)

The Phase Lock error codes (6000 - 6999) will have an alphabetical suffix (code) following the message. For example: 6079 PHS LCK FAIL ABCDG. This code consists of one or more letters from A - G that rep resent the sub assembly that was not locked and/or the nature of the failure. The phase lock failure mode suffixes are listed in Table 5-2.

Note that most phase lock error codes will normally consist of a letter identifying the unlocked assembly and the D and/or DE letters that indicate the Source Module is also unlocked. This is normal since all components in the phase lock loop must be correctly locked in order for

373XXA MM 5-11

SYSTEM HAS ERROR CODE TROUBLESHOOTING

Table 5-2. Phase Lock Error Message Failure Suffixes

Failure

Suffix

A 10 MHz not present E IF lock signal level too low B L01 unlocked F Ext synthesizer unlocked C L02 unlocked G L03 unlocked D Source unlocked none Unknown

Failed Assembly/

Failure Mode

Failure

Suffix

Failed Assembly/

Failure Mode

the Source Module to achieve lock. Refer to Figure 5-2 for a flowchart that troubleshoots the >40 GHz models (37397A).

Example 1: Any of the following error messages indicate that the LO1 PCB assembly was not able to lock:

6002 PHS LCK FAIL B 6010 PHS LCK FAIL BD 6026 PHS LCK FAIL BDE

Also note that if the 10 MHz Reference fails, depending on the failure, the system will not be able to lock any of the phase lock loop components: A1, A2, A7, A8, or Source Module.

Example 2: Either of the following error messages indicate a 10 MHz Reference problem:

Service Log Snap

Shot Data

6001 PHS LCK A 6015 PHS LCK ABCDG

Error codes will be written to the service log along with some data repre senting a “Snap Shot” of system conditions at the time of failure. Usually , the data included in the snap shot helps to provide faster diagnosis of the error condition. The common snap shot data items that will be useful inassembly level troubleshooting and fault diagnosis efforts are listed in Table5-3.

NOTE

Some of the data included in the snap shot is useful only for factory troubleshooting activities.

5-12 373XXA MM

TROUBLESHOOTING SYSTEM HAS ERROR CODE

Table 5-3. Service Log Snap Shot Data Items

Item Description

SWP Sweep direction:

F = forward (S11, S21), R = reverse (S22, S12)

PWR System source power setting

SYS System frequency setting

A The calibration results for the Test A Channel PCB (A3): This is a

series of 16 values divided into groups of four. Each group should have values that are approximately group.

that of those in the previous

The first group data values should be approximately: 1.00 0.00

0.00 1.00. The values of the next group should be values i.e., 0.25 0.00 0.00 0.25. The same applies for the values

that of those

in the remaining two groups.

B The calibration results for the Test B Channel PCB (A6). See de

scription for “A” above.

R The calibration results for the Reference A (or B) Channel PCB

(A4). See description for “A” above.

<OVL>

Indicates the value was too far out of range to be measurable.

PHSLCK Source Locking: L=Source Lock Mode, T=Tracking Mode, S=Set On

Mode

373XXA MM 5-13

SYSTEM HAS ERROR CODE TROUBLESHOOTING

Lock Failure DE

Code 6XXX)(Error

Yes

OK 40MHz

to 272MHz?

Yes

Normal power at

Port 1?

A8,YIG Osc, SW filter, or Source PCB Failure

Yes

Fails above

38 GHz?

Yes

A8, Buffer Amp

Failure

Normal power at

Port 1?

SDM, SW filter, Xfer

Switch, or source

PCB failure

Fails both

Forward and

Reverse?

Yes

Fails below

38 GHz?

Buffer Amp, Power Amp, or A1 Failure

Yes

See Sheet 2

Yes

Normal power at

Port 1?

Go to

Fails above

38 GHz?

SPDT Switch, SW

Filter, A8 or Source

PCB Failure

Not logical. Call Customer Service

Yes

Buffer Amp, A4

or A8 Failure

NOTE: Sampler/Buffer amplifiers are individually matched to

Power Amp or

LO1 Failure

Power Amplifiers. If either fails, both should be replaced with

another matched set, part number ND53249.

Figure 5-2. Error Code DE Lock Failure Troubleshooting (37397A) (1 of 3)

5-14 373XXA MM

TROUBLESHOOTING SYSTEM HAS ERROR CODE

Yes

Normal power at

Port 1 (S21)?

From Sheet 1

Yes

Fails above

38 GHz?

Yes

Forward only ?

Normal power at

Port 1 (S21)?

Fails in

Yes

Fails below

38 GHz?

Yes

See Sheet 3

Yes

Normal power at

Port 1 (S21)?

Go to

Fails above 38

GHz?

Not logical. Call Customer Service

Buffer Amp, A4 or

A8 Failure

Ref A MUX

Coupler Failure

A8, A4, or Buffer

Amp Failure

Transfer Switch

or A8 Failure

Buffer Amp, A4,

or A8 Failure

SPDT Switch, Ref A

SQM, A8 or MUX

Coupler Failure

Figure 5-2. Error Code DE Lock Failure Troubleshooting (37397A) (2 of 3)

373XXA MM 5-15

SYSTEM HAS ERROR CODE TROUBLESHOOTING

Yes

Normal power at

Port 2 (S12)?

From Sheet 1

Yes

Fails above

38 GHz?

Normal power at

Port 2 (S12)?

Reverse Fails

Only?

Yes

Fails below

38 GHz?

Yes

Normal power at

Port 2 (S12)?

Not logical. Call Customer Service

Fails above

38 GHz?

Not logical. Call Customer Service

Yes

Buffer Amp, A4

or A8 Failure

Ref B MUX Failure

A8, A4, or Buffer

Amp Failure

Yes

A8, transfer sw

failure

Yes

Buffer Amp, A8, or

A4 Failure

Figure 5-2. Error Code DE Lock Failure Troubleshooting (37397A) (3 of 3)

Ref B SQM, SPDT

Switch, A8, or MUX Failure

5-16 373XXA MM

TROUBLESHOOTING SOURCE/TEST SET/RECEIVER

5-7 SOURCE/TEST

SET/RECEIVER

Signal Source Phase

Lock Loop Assemblies

Because of the 373XXA phase-lock loop structure, it is not easy to distin guish between failures that occur in the Source Module, the T estSet Module and the Receiver Module. In order to troubleshoot failures occur ring in this group of modules, it is essential to be familiar with how each module functions and how it interacts with the other modules. Refer to Chapter 7, System description, for a functional description of each mod ule.

For Model 37397A, refer to Figure 5-3 and Figure 5-4 (rear of section) for aid in troubleshooting Test and Source Lock signal paths. Refer also to Table 5-6 (rear of section) for a list of typical reference signal values, and to Tables 5-7 and -8 for Transfer and DPDT Switch Volt ages.

The 373XXA assemblies that contain circuits that are part of the sig nal source phase-lock loop (Source Lock function) are listed in Table 5-4.

Table 5-4. Phase Lock Loop Assemblies**

Assemblies Location

A21A1 Source YIG/Bias PCB Source Module A21A2 Source Control Source Module YIG Oscillator Source Module

Switched Filter Source Module Down Converter Source Module Switched Doubler Module SDM* Test Set Module Transfer Switch Test Set Module Buffer Amplifier Receiver Module A1 LO1 PCB Receiver Module A2 LO2 PCB Receiver Module A4 Reference IF PCB IF Section A8 Source Lock/Signal Separation Control PCB Analog Subsystem A9 Main Processor PCB Digital Subsystem

∗ Model 37369A only, ** See Figure 5-4 for 37397Amodels

Failures occurring in the Source Module, Test Set Module and Re

ceiver Module will generally cause the system to produce “Phase Lock Fail” error codes. Included with the Phase Lock Fail error codes are al phabetical suffixes that indicate the probable malfunctioned sub-assembly.

Example: 6008 PHS LCK FAIL D

373XXA MM 5-17

SOURCE/TEST SET/RECEIVER TROUBLESHOOTING

Signal Source/Test

Set Module Error

Codes

The letter “D” in the error code above indicates that the failure is pos sibly in the Source Module. (Refer to Table 5-3.)

Failures occurring in the Signal Source Module and Test Set Module will also produce the error codes listed in Table5-5.

Table 5-5. Signal Source/Test Set Module Error Codes

Error Codes Possible Failed Assemblies

5110 RF PWR UNLEVELED All components in Source Module

and Test Set Module 5210 REF A CHAN RF OVERLOAD Transfer Switch 5220 REF B CHAN RF OVERLOAD Transfer Switch 5230 TA CHAN RF OVERLOAD Transfer Switch or A21A2 PCB 5240 TB CHAN RF OVERLOAD Transfer Switch or A21A2 PCB

NOTE

The 373XXA has extensive built-in troubleshooting tools that are useful for troubleshooting the failures listed in Table 5-5. These and other troubleshooting tools are accessed from the Option Menu key, which is part of the enhancement keygroup. (From the select OPTIONS menu select DIAGNOSTICS, then select TROUBLE- SHOOTING). Refer to Appendix A.

Troubleshooting tools that are available from the TROUBLE

SHOOTING menu that are useful for locating faults occurring in the Source Module, Test Set Module and Receiver Module are:

NOTE

The troubleshooting tools listed below are used to test the 373XXA to factory set limits when the ANRITSU 37300A Test Software (2300-178) is run.

When run from the TROUBLESHOOTING menu, not all tests will display limit lines (as is the case when the 37300A Test Software 2300-178 is used).

NON-RATIO PARAMETERS

This function displays the output of each of the individual test set channels. It is especially useful for verifying the performance of the Buffer Amplifier and Power Amplifier.

NOTE

A through-line cable connecting Port 1 and Port 2 is re

quired for this check.

5-18 373XXA MM

TROUBLESHOOTING SOURCE/TEST SET/RECEIVER

By examining these displays in conjunction with other failure symp

toms, the failed assembly can be located. Example: Suppose the Non-Ratio Parameter screen display shows

power holes above 270 MHz on all traces and in both sweep directions. A possible cause for this condition is a failure of the Power Amplifier assembly at certain frequencies. (Refer to Analog Subsystem Block Di agram in Figure 7-2 on page 7-6).

LO1

This function allows user to verify whether the A1 LO1 PCB is operat ing properly.

LO2

This function allows the user to verify whether the A2 LO2 PCB is op erating properly.

SOURCE

This function allows the user to verify whether the Source Module is operating properly.

Isolation Procedures The procedures in the following paragraphs will help you isolate the fault

to the major assembly.

Check #1 Proceed as follows:

Step 1.

Step 2.

Press Option Menu key and select the DIAGNOSTICS menu option.

OPTIONS

TRIGGERS REAR PANEL

OUTPUT

DIAGNOSTICS

MULTIPLE SOURCE CONTROL

PRESS <ENTER> TO

SELECT

DIAGNOSTICS

START SELF TEST

READ SERVICE LOG

INSTALLED OPTIONS PERIPHERAL TESTS TROUBLESHOOTING

(FOR SERVICE ONLY)

HW CALIBRATIONS (FOR SERVICE ONLY)

PRESS <ENTER> TO

SELECT

Select the READ SERVICE LOG menu option to display the error entry associated with the system failure. Observe the snap shot data included as part of the error entry and note the sweep direction indication for each error code. (Re fer to Table 5-3.)

373XXA MM 5-19

SOURCE/TEST SET/RECEIVER TROUBLESHOOTING

Step 3. Determine whether the failure occurs during forward mea

surements (S11, S21) and/or reverse measurements (S22, S12):

If the problem occurs in both directions at all frequencies, the fault could be in the Receiver Module, Signal Source Module, or Test Set Module.

If the problem occurs in both directions at only certain frequencies, the fault could be in the Signal Source Module.

If the problem occurs in only one direction, the fault could be in the TEST SET MODULE.

Step 4. Run the 37XXX Test Software (2300-178) program to verify

operation of the Buffer Amplifier, A1 LO1 PCB, A2 LO2 PCB, and Source control PCB.

Use the information obtained in steps1–4above to determine whether the failure occurs in the Source Module, Test Module or Receiver Module. Replace the suspected failed assembly, and perform any required adjustment(s). Then retest. If the 373XXA still fails, contact ANRITSU Customer Service Center for further assistance.

NOTE

To obtain technical service support from your nearest ANRITSU Customer Service Center, refer to Paragraph 1-8, Service Support Information.

Check #2 If you have determined that the failure occurs in both sweep direc

tions, only at certain frequencies, and that Error Code 5110 is re

corded in the Service Log, use the following procedures to determine which assembly may have failed:

Step 1. Set the 373XXA Start and Stop frequencies for the follow

ing bands:

Band Start Stop

1 2

∗ Models 37311A and 37317A

22.5*/40 MHz

2.0 GHz

20.0 GHz

Step 2. If the problem occurs in Band 1, replace the Down Con

2.0 GHz

Upper band-edge frequency for model. (20 GHz for 37369A)

40.0 GHz (for Model 37369A only)

verter assembly and repeat test.

5-20 373XXA MM

TROUBLESHOOTING PERIPHERALS/ INTERFACE

If it fails, contact ANRITSU Customer Service Center.

Step 3. If the problem only occurs in Band 3, replace the Switched

Doubler Module assembly and repeat test. If it fails, replace Switched filter and repeat test.

If it fails, contact ANRITSU Customer Service Center.

Step 4. If the problem only occurs in Band 2, replace Switched Fil

ter assembly and repeat test. If it fails, contact ANRITSU Customer Service Center.

NOTE

After replacing a component, perform a Frequency Cali bration and a RF power/ALC Calibration. Refer to Chap ter 6, Adjustments.

Check #3 If you have determined that failure occurs in both sweep directions, at

all frequencies and Error Code 5110 is recorded in the Service Log, the

failed component could be any of the following assemblies:

1. Transfer Switch

2. Switched Doubler Module

3. YIG Oscillator

4. A21A1 YIG Bias PCB

5. A21A2 Source Control PCB

5-8 PERIPHERALS/

INTERFACE

CRT Display Test

Replace the components listed above in sequence. After each replace ment recalibrate unit (see note above) and retest. If 373XXA still fails, contact your nearest ANRITSU Customer Service Center.

The following paragraphs contain procedures to be used for troubleshoot ing 373XXA peripheral or interface test failures. Select the paragraph subheading that corresponds to the test that failed.

If the CRT Display Test failed, troubleshoot as follows:

Failures:

Step 1. Replace the CRT Monitor Assembly. Step 2. Perform the CRT Monitor Test again; if fail, replace the

A15, Graphics Processor PCB.

373XXA MM 5-21

MEASUREMENT IN QUESTION TROUBLESHOOTING

Step 3. Perform the CRT Monitor Test again; if fail, contact

ANRITSU Customer Service Center.

Front Panel Test

Failures:

External Keyboard

Interface Test

Failures:

Printer Interface Test

Failures:

If the Front Panel Test failed, troubleshoot as follows:

Step 1. Replace the Front Panel Assembly. Step 2. Perform the Front Panel Test again; if fail, replace the A14,

I/O#1 PCB.

Step 3. Perform the Front Panel Test again; if fail, contact

ANRITSU Customer Service Center.

If the External Keyboard Interface Test failed, troubleshoot as follows:

Step 1. Replace the A18, Rear Panel PCB. Step 2. Perform the External Keyboard Interface Test again; if fail,

replace the A13, I/O#1 PCB.

Step 3. Perform the External Keyboard Interface Test again; if fail,

contact ANRITSU Customer Service Center.

If the Printer Interface Test failed, troubleshoot as follows:

Step 1. Replace the A18, Rear Panel PCB.

GPIB Interface Test

Failures:

5-9 MEASUREMENT IN

QUESTION

Step 2. Perform the Printer Interface Test again; if fail, replace the

A13, I/O#1 PCB.

Step 3. Perform the Printer Interface Test again; if fail, contact

ANRITSU Customer Service Center.

If the GPIB Interface Test failed, troubleshoot as follows:

Step 1. Replace the A18, Rear Panel PCB. Step 2. Perform the GPIB Interface Test again; if fail, replace the

A13, I/O#1 PCB.

Step 3. Perform the GPIB Interface Test again; if fail, contact

ANRITSU Customer Service Center.

If the 373XXA measurement quality is suspect, the following paragraphs provide guidelines and hints for determining possible measurement qual ity problems.

The quality of 373XXAVNA measurements is determined by the fol lowing test conditions and variables:

5-22 373XXA MM

TROUBLESHOOTING MEASUREMENT IN QUESTION

Condition of the 373XXA.

Measurement

Conditions Check List

Quality and condition of the interface connections and connec

tors. Quality and condition of the calibration components,

through-lines, adapters and fixtures. Surrounding environmental conditions at the time of the mea

surement. Selection and performance of the calibration for the DUT being

measured.

When determining possible measurement problems, check the follow ing items:

1. Check the DUT and the calibration conditions: ensure the Calibration Components Coefficients data has been

installed into the system from the Calibration Kit in use. ensure the proper calibration was done for the device being

measured:

n For high insertion loss device measurements the calibra-

tion should include isolation, high number of averages, and lower IF Bandwidth settings during the calibration.

n For high return loss device measurements the calibra-

tion should also include a sliding load calibration.

Check DUT mating connector(s) condition and pin depth.

Measure an alternate known good DUT, if possible.

Check if the environment is stable enough for the accuracy re quired for the DUT measurement.

The system should not be subjected to variations in tem perature.

The system should not be placed in direct sun light or next to a changing cooling source, such as a fan or air conditioning unit.

2. Check the calibration using known good components from the cal

ibration kit. If measurements of these devices do not produce good results:

Check through-cable stability including condition and pin depth. Replace with a known good cable, if necessary.

Check condition and pin depth of calibration kit components. Replace with known good components, if necessary.

Check condition and pin depth of test port connectors. Replace with known good ones if necessary.

373XXA MM 5-23

MEASUREMENT IN QUESTION TROUBLESHOOTING

NOTE

The procedures for performing pin depth measurements for the connectors used on ANRITSU products are con tained in Appendix C, Connector Maintenance Check Pro cedures.

3. Check the system performance as follows: Perform the Signal Path Tests that are part of the Operational

Tests. Refer to Chapter 3, Operational Tests. Check Match, Directivity, and Dynamic Range as described in

Chapter 4, Performance Verification. Complete the remaining checks described in Chapter 4 (Per

formance Verification).

Table 5-6. Typical Reference Signal Values in dBm

Frequency SQM In SDM Out MUX J4 MUX J1 Buffer Amp In

20 GHz NA +18 +6 NA -26 37 GHz NA +20 +4 NA -28 40 GHz +19 NA NA +14 -28 50 GHz +18 NA NA +14 -23 65 GHz +16 NA NA +10 -26

Table 5-7. Typical Transfer Switch Voltages (CW, Single Channel Display)

Below 38 GHz Above 38 GHz

Wire Color

S21 S12 S21 S12

Brown +2.0 -3.3 +2.0 +2.0 Black -6.7 +1.6 +1.6 +1.6 White +1.6 -6.8 +1.6 +1.6 Grey -3.3 +2.0 +2.0 +2.0

Figure 5-8. Typical SPDT Switch Voltages (CW, Single Channel Display)

Wire Color Forward Reverse

Brown +1.2 -3.7 Grey -3.7 +1.2

5-24 373XXA MM

TROUBLESHOOTING SIGNAL PATHS

YIG Oscillator

2-20GHz

40MHz-

2GHz

16.8 GHz Lowpass

Filter

Switched Filter

15 dB

Pad

Down

Converter

9.5-

16.25GHz

6.3-

8.3GHz

40MHz-

19GHz

SPDT Switch

(SDM)

Test B

Test A

40MHz-38GHz

(SQM)

Forward

(SQM)

Reverse

Test B 38-65 GHz

Test A 38-65 GHz

Transfer Switch (Test A/ Test B

DC voltages

control)

Test B 38 -65

37 GHz

HiPass Filter

37 GHz

HiPass Filter

Test A

38-65

GHz

Test B 40MHz - 38GHz

Test A 40MHz - 38GHz

GHz

MUX Coupler

J4J2

DCV

(Forward)

(reverse)

40MHz - 65GHz (Test B)

Step

Attenuator

40MHz - 65GHz (Test A)

Bias Tee

Front

Panel

Access

Loop**

Bias Tee

Coupled

Arm

Coupled

Arm

Attenuator

Port 1

Coupler

Port 2

Coupler

Step

Rear

Panel Access Loop **

Device

Under

Te st

(DUT)

First LO

(A1 PCB)

Power Amp

NOTE: Sampler/Buffer amplifiers are individually matched to Power Amplifiers. If either fails, both should be replaced with

another matched set, part number ND53249.

** Indicates not

Figure 5-3. 37397A Test Signal Path Diagram

J4 J5 J2 J3

Digital Data to

Processor

Analog to Digital Converter

A5 PCB

resent on model 37297B or 37277B

A3 PCB

Test A IF

J2J2

A6 PCB

TestBIF

2.5 MHz CW

Sampler/Buffer Amp

J2 J7

Te st B Te st A

2.5 MHz CW

Second LO

(A2 PCB)

373XXA MM 5-25

SIGNAL PATHS TROUBLESHOOTING

YIG Oscillator

2-20GHz

Switched Filter

40MHz-

2GHz

15 dB

Pad

Converter

YIG tuning currents

16.8 GHz Lowpass

Filter

Down

First LO

(A1 PCB)

9.5-

16.25GHz

40MHz-

19GHz

6.3-

8.3GHz

SPDT Switch

(SDM)

Ref A

Ref B

40MHz-38GHz

(SQM)

Forward

(SQM)

Reverse

Ref A 38-65 GHz

Ref B 38-65 GHz

Transfer Switch

(Ref A/ Ref B

Control)

37 GHz

HiPass Filter

37 GHz

HiPass Filter

Ref B 38-65

GHz

Ref A 40MHz - 38GHz

Ref B 40MHz - 38GHz

Ref A 38-65 GHz

3dBpad

MUX Coupler

(forward)

MUX Coupler

(reverse)

J4J4

DCV

ALC Control PCB

49808-3

40MHz-65GHz (Ref A)

DCV

Shaped Pad

40MHz -

65GHz (Ref B)

3dBPad

3dBpad

Rear

Panel Access Loop **

Shaped Pad

3dBPad

3dBpad

(357-536MHz)

Power Amp

Sampler/Buffer Amp

J5 J3

Ref A

2.5 MHz CW

Second LO

(A2 PCB)

(25-272MHz)

Ref B

Bias Voltages to YIG,

Switched Filter

Down Converter, SAM

A21A1 PCB

SDM Control

Digital and Analog Control

A21A2 PCB

voltage

DC voltage (6 MHz / Volt)

Control of SPDT

switch, transfer switch,

buffer amp, power

amp, ALC control

A8 PCB

Source Lock/ RF

Component Control

J2J1

2.5 MHz CW J4

A4 PCB

Reference IF Processor

NOTE: Sampler/Buffer amplifiers are individually matched to

Power Amplifiers. If either fails, both should be replaced with

another matched set, part number ND53249.

** Indicates notpresent on model 37297B or 37277B

Figure 5-4. 37397A Source Lock Signal Path Diagram

5-26 373XXA MM

Contents

6-1 INTRODUCTION ·························6-3 6-2 LO1 CALIBRATION························6-3

6-3 LO 2 CALIBRATION ·······················6-4

6-4 FREQUENCY CALIBRATION ··················6-5

Chapter 6 Adjustments

Calibration Procedure ·······················6-3 Post Calibration Actions······················6-3

Calibration Procedure ·······················6-4 Post Calibration Actions······················6-5

Calibration Procedure ·······················6-6 Post Calibration Actions······················6-7

6-5 RF POWER/ALC CALIBRATION·················6-8

Calibration Procedure ·······················6-9 Post Calibration Actions ·····················6-10

6-6 SOURCE LOCK THRESHOLD ·················6-11

Calibration Procedure ······················6-12 Post Calibration Actions ·····················6-12

6-7 A8 ADJUSTMENT (37397A) ··················6-13

Calibration Procedure ······················6-13 Post Calibration Actions ·····················6-13

6-8 A21A2 ADJUSTMENT (37397A) ················6-14

Calibration Procedure ······················6-14 Post Calibration Actions ·····················6-15

Chapter 6 Adjustments

6-1 INTRODUCTION This chapter contains procedures that are used to restore the calibration

of the 373XXA signal source and the related source lock system assem blies. Use these procedures after various signal source related assemblies have been replaced due to troubleshooting or repair activities.

Please insure you have read and fully understand the servicing con cepts for the 373XXApresented in Chapter 1 prior to continuing with this chapter.

6-2 LO1 CALIBRATION This procedure uses the 373XXA internal diagnostics and calibration

menus to adjust the A1 1st LO PCB assembly. Perform this calibation procedure if:

The A1 PCB is replaced.

q BBRAM chip on A9 Processor PCB is replaced and the Source

Lock Threshold Calibration data was not previously saved on disk (that is, data is not available for recall from a floppy disk).

Calibration

Procedure

Perform the following steps:

Equipment Required

None

NOTE

Allow the 373XXAto warm-up at least 30 minutes prior to performing calibration.

Procedure

Step 1. Press the Option Menu key (Enhancement key group) to dis

play the OPTIONS menu.

Post Calibration

Actions

Step 2.

Step 3. Follow the directions displayed on the 373XXA CRT screen,

After the calibration process is completed, perform the following ac tions, as appropriate:

Select DIAGNOSTICS from menu.Then select in se quence: H/W CALIBRATIONS then LO1 CALIBRA

TION.

until calibration is completed.

373XXA MM 6-3

LO 2 CALIBRATION ADJUSTMENTS

If calibration passes:

Save the calibration data to (hard) disk, as follows: Step 1. Press the Option Menu key (Enhancement key group) to dis

play the OPTIONS menu.

Step 2.

If calibration fails:

Step 1. Repeat the calibration. If it still fails, then proceed to

Select DIAGNOSTICS from menu.Then select in se quence: H/W CALIBRATIONS |DISK OPERATIONS

|SAVE TO HARD DISK|HW_CAL.LO1.

NOTE

Also save the calibration data to floppy disk for archival purposes as a backup in case of a hard disk failure. Label the disk with cali bration type, date, and system model and se rial numbers. Set the copy protect tab on the disk. Properly safeguard the disk so that it will be available for later use, as needed.

Chapter 5, Troubleshooting.

6-3 LO 2 CALIBRATION This procedure uses the 373XXA internal diagnostics and calibration

menus to adjust the A2 2nd LO PCB assembly. Perform this calibation procedure if:

The A2 PCB is replaced.

BBRAM chip on A9 Processor PCB is replaced and the LO2 Cali bration data was not previously saved on disk (that is, data is not available for recall from a floppy disk).

Calibration

Procedure

Perform the following steps:

Equipment Required

None

NOTE

Allow the 373XXAto warm-up at least 30 minutes prior to performing calibration.

Procedure

Step 1. Press the Option Menu key (Enhancement key group) to dis

play the OPTIONS menu.

6-4 373XXA MM

ADJUSTMENTS FREQUENCY CALIBRATION

Post Calibration

Actions

Step 2.

Step 3. Follow the directions displayed on the 373XXA CRT screen,

After the calibration process is completed, perform the following ac tions, as appropriate:

If calibration passes:

Save the calibration data to (hard) disk, as follows: Step 1. Press the Option Menu key (Enhancement key group) to dis

Step 2.

Select DIAGNOSTICS from menu.Then select in se quence: H/W CALIBRATIONS then LO2 CALIBRA

TION.

until calibration is completed.

play the OPTIONS menu. Select DIAGNOSTICS from menu.Then select in se

quence: H/W CALIBRATIONS |DISK OPERATIONS

|SAVE TO HARD DISK|HW_CAL.LO2.

NOTE

Also save the calibration data to floppy disk for archival purposes as a backup in case of a hard disk failure. Label the disk with calibration type date, and system model and serial numbers. Set the copy protect tab on the disk. Properly safeguard the disk so that it will be available for later use, as needed.

If calibration fails:

Step 1. Repeat the calibration. If it still fails, then proceed to

Chapter 5, Troubleshooting.

6-4 FREQUENCY

CALIBRATION

This procedure uses the internal 373XXA diagnostics and calibration menus, in conjunction with a suitable frequency counter ,to adjust the sig nal source frequencies throughout the range of the 373XXA model being calibrated. Perform this calibration procedure if:

The Source FM/Lock Linearity test in Chapter 3, Operational Test, fails.

Other testing or troubleshooting reveals a possible problem with the signal source frequency accuracy or phase lock loop.

Any of the following assemblies are replaced:

A21A1 Source YIG/Bias

A21A2 Source Controller

Down Converter

373XXA MM 6-5

FREQUENCY CALIBRATION ADJUSTMENTS

YIG Oscillator

Switched Filter

BBRAM chip on the A9 Processor PCB is replaced and the

Source Calibration Data was not previously saved on disk (thus data could not be recalled from disk).

Calibration

Procedure

Perform the following steps:

Equipment Required

Refer to Table 1-1, located on page 1-9, for further information about the following equipment:

EIP Model 578B Frequency Counter, or equivalent. RF/Microwave Cable GPIB cable, WILTRON 2100-2, or equivalent

NOTE

Allow the 373XXAand Frequency Counter to warm-up at least 30 minutes prior to performing calibration.

Procedure

Step 1. Press the Option Menu key (Enhancement key group) to dis-

play the OPTIONS menu.

Step 2.

Select DIAGNOSTICS from menu; then select in se

quence: H/W CALIBRATION,and then SOURCE FREQUENCY CALIBRATION (below).

OPTIONS

TRIGGERS REAR PANEL

OUTPUT

DIAGNOSTICS

MULTIPLE SOURCE CONTROL

PRESS <ENTER> TO

SELECT

DIAGNOSTICS

START SELF TEST READ SERVICE LOG INSTALLED OPTIONS PERIPHERAL TESTS TROUBLESHOOTING

(FOR SERVICE ONLY)

H/W CALIBRATIONS (FOR SERVICE ONLY)

PRESS <ENTER> TO

SELECT

HARDWARE

CALIBRATIONS

(FOR SERVICE

ONLY)

LO1 CALIBRATION

LO2 CALIBRATION

SOURCE FREQUENCY CALIBRATION

SOURCE ALC CALIBRATION

DISK OPERATIONS PREVIOUS MENU

PRESS <ENTER> TO

SELECT

HARDWARE

CALIBRATIONS

(FOR SERVICE

ONLY)

START ALC FREQ CALIBRATION

PREVIOUS MENU

PRESS <ENTER> TO

SELECT

6-6 373XXA MM

ADJUSTMENTS FREQUENCY CALIBRATION

Step 3. Follow the directions displayed on the screen to set-up and

connect the frequency counter to the 373XXA. Refer also to

373XXA VNA

Dedicated GPIB

789

456

Figure 6-1 Select START SOURCE FREQ CALIBRA TION from menu (above).

Microwave Cable

Figure 6-1. Test Setup for Frequency Calibration

Step 4. Follow the directions displayed on the 373XXA CRT screen,

Post Calibration

Actions

After the calibration process is completed, perform the following actions, as appropriate:

If calibration passes:

Save the calibration data to (hard) disk, as follows: Step 1. Press the Option Menu key (Enhancement key group) to dis

Step 2.

EIP 578B Frequency Counter

EIP

Band 1

Band 2

Band 3

until calibration is completed.

play the OPTIONS menu. Select DIAGNOSTICS from menu.Then select in se

quence: H/W CALIBRATIONS |DISK OPERATIONS

|SAVE TO HARD DISK |HW_CAL.FRE.

NOTE

Also save the calibration data to floppy disk for archival purposes as a backup in case of a hard disk failure. Label the disk with cali

bration type (FRE), date, and system model and serial numbers. Set the copy protect tab on the disk. Properly safeguard the disk so that it will be available for later use, as needed.

Perform the Source FM/Lock Linearity test in Chapter 3, Operational Tests. If the test fails, proceed to Chapter 5, Troubleshooting.

373XXA MM 6-7

RF POWER/ALC CALIBRATION ADJUSTMENTS

If calibration fails:

6-5 RF POWER/ALC

CALIBRATION

Verify the GPIB cable is connected to the Dedicated GPIB (bot

tom) connector on the 373XXA rear panel. Verify that the frequency counter is functioning correctly, the ca

ble is in good condition, and all connections are secure. Note which calibration step failed from the screen messages.

Repeat the calibration. If it still fails, then go to Chapter 5, Trou

bleshooting.

This procedure uses the 373XXA internal diagnostics and calibration menus, in conjunction with a suitable power meter, to adjust the out put power level of the signal source throughout the range of the 373XXA model being calibrated. Perform this calibration procedure if:

The Source Power/ALC test in Chapter 3, Operating Test, fails.

Other testing or troubleshooting reveals a possible problem with

RF Power accuracy or the ALC loop. Any of the following assemblies are replaced:

n A21A1 Source YIG/Bias n A21A2 Source Controller n Down Converter

n YIG Oscillator n Switched Filter

Transfer Switch

SDM (37369A)

Coupler (37325A and above)

Bridge (37317A and below)

Port 1 Source Step Attenuator

Buffer Amplifier

BBRAM chip on the A9 Processor PCB is replaced and the Source Calibration Data was not previously saved on disk (thus data could not be recalled from disk).

6-8 373XXA MM

ADJUSTMENTS RF POWER/ALC CALIBRATION

Calibration

Procedure

Perform the following steps:

Equipment Required

Refer to Table 1-1, located on page 1-9, for further information about the following equipment:

HP 437B Power Meter with HP 8487A Power Sensor

or:

ANRITSU ML24XXA with Version 2.02 or later, with ANRITSU Power Sensors MA2474Aand SC6230 for 50 and 65 GHz units.

or:

Gigatronics 8541/8542 with 80304APower Sensor GPIB cable, WILTRON 2100-2, or equivalent

NOTE

Allow the 373XXAand power meter to warm-up at least 30 minutes prior to performing calibration.

65 GHz Power Sensor Setup Procedure

The Anritsu SC6230 Power Sensor has an internal frequency calibration factors table. The ML24XX meter settings must be changed so that the table will be used for frequencies above 50 GHz. To configure the meter for the new calibration factors table, proceed as follows:

Step 1. Step 2. Step 3. Step 4. Step 5. Press the System key to exit.

Procedure

Step 1. Press the Option Menu key (Enhancement key group) to

Step 2.

Press the Sensor key then Cal Factor softkey. Press the More softkey. Press the Use Table sofkey. Cursor will start blinking. Press 1 then the Enter softkey.

display the OPTIONS menu. Select DIAGNOSTICS from menu; then select in se

373XXA MM 6-9

RF POWER/ALC CALIBRATION ADJUSTMENTS

Dedicated GPIB

ANRITSU 373XXA

VNA

789

0.-

SC6230 Sensor

Figure 6-2. Equipment Set-Up for RF Power/ALC Calibration

quence: H/W CALIBRATIONS, and then SOURCE ALC CALIBRATION (below).

ANRITSU ML24XXA

Power Meter

OPTIONS

TRIGGERS REAR PANEL

OUTPUT

DIAGNOSTICS

MULTIPLE SOURCE CONTROL

PRESS <ENTER> TO

SELECT

DIAGNOSTICS

START SELF TEST READ SERVICE LOG INSTALLED OPTIONS PERIPHERAL TESTS TROUBLESHOOTING

(FOR SERVICE ONLY)

H/W CALIBRATIONS (FOR SERVICE ONLY)

PRESS <ENTER> TO

SELECT

HARDWARE

CALIBRATIONS

(FOR SERVICE

ONLY)

LO1 CALIBRATION

LO2 CALIBRATION

SOURCE FREQUENCY CALIBRATION

SOURCE ALC CALIBRATION

DISK OPERATIONS PREVIOUS MENU

PRESS <ENTER> TO

SELECT

Set-Up

HARDWARE

CALIBRATIONS

(FOR SERVICE

ONLY)

START SOURCE FREQ CALIBRATION

PREVIOUS MENU

PRESS <ENTER> TO

SELECT

Step 3. Follow the directions displayed on the screen to set-up and

connect the power meter to the 373XXA. Refer also to Fig ure 6-2. Select START ALC CALIBRATION from menu.

Step 4. Follow the directions displayed on the 373XXA CRT screen,

until calibration is completed.

Step 5. If the software allows a Port 2 ALC Calibration, perform it

now.

Post Calibration

Actions

After the calibration process is completed, perform the following ac tions, as appropriate:

6-10 373XXA MM

ADJUSTMENTS SOURCE LOCK THRESHOLD

If calibration passes:

Save the calibration data to (hard) disk, as follows: Step 1. Press the Option Menu key (Enhancement key group) to dis

play the OPTIONS menu.

Step 2.

Select DIAGNOSTICS from menu.Then select in se

quence: H/W CALIBRATIONS |DISK OPERATIONS

|SAVE TO HARD DISK|HW_CAL.ALC.

NOTE

Also save the calibration data to floppy disk for archival purposes as a backup in case of a hard disk failure. Label the disk with cali

bration type (ALC), date, and system model and serial numbers. Set the copy protect tab on the disk. Properly safeguard the disk so that it will be available for later use, as needed.

Perform the RF Power Generation and Control test in Chapter 3, Operational Tests. If the test fails, proceed to Chapter 5, Troubleshooting.

If calibration fails:

Verify the GPIB cable is connected to the Dedicated GPIB (bottom) connector on the 373XXA rear panel.

6-6 SOURCE LOCK

THRESHOLD

Calibration

Procedure

Verify that the power meter and sensor are functioning correctly, the cables are in good condition, and all connections are secure.

Verify the correct power sensor data exists in the power meter.

Note the failed step in the calibration procedure from the screen messages.

Repeat calibration. If it still fails then proceed to Chapter 5, Troubleshooting.

This procedure uses the 373XXA internal diagnostics and calibration menus to adjust the source lock threshold of the phase-lock loop. Per form this calibation procedure if:

The A4 PCB is replaced.

BBRAM chip on A9 Processor PCB is replaced and the Source Lock Threshold Calibration data was not previously saved on disk (that is, data is not available for recall from a floppy disk).

Perform the following steps:

373XXA MM 6-11

SOURCE LOCK THRESHOLD ADJUSTMENTS

Equipment Required

None

NOTE

Allow the 373XXAto warm-up at least 30 minutes prior to performing calibration, and perform the ALC calibration (paragraph 6-3) before doing this calibration.

Procedure

Step 1. If recalibrating a 37397A , install broadband terminations

to both ports or install a throughline between ports.

Post Calibration

Actions

Step 2. Press the Option Menu key (Enhancement key group) to dis

play the OPTIONS menu.

Step 3.

Step 4. Follow the directions displayed on the 373XXA CRT screen,

After the calibration process is completed, perform the following actions, as appropriate:

If calibration passes:

Save the calibration data to (hard) disk, as follows: Step 1. Press the Option Menu key (Enhancement key group) to dis

Step 2.

Select DIAGNOSTICS from menu.Then select in se quence: H/W CALIBRATIONS then SOURCE THRESH

OLD CALIBRATION.

until calibration is completed.

play the OPTIONS menu. Select DIAGNOSTICS from menu.Then select in se

quence: H/W CALIBRATIONS |DISK OPERATIONS

|SAVE TO HARD DISK|HW_CAL.SLT.

NOTE

If calibration fails:

Repeat the calibration. If it still fails, then proceed to Chapter 5, Troubleshooting.

6-12 373XXA MM

ADJUSTMENTS A8 ADJUSTMENT (37397A)

6-7 A8 ADJUSTMENT

(37397A)

Calibration

Procedure

The adjustments are important to the operation of the VNA above 56 GHz. Improperly adjusted A8 Potentiometers may cause lock failures. Perform these adjustments as follows:

The A8 PCB is replaced.

44733 Buffer Amp is replaced.

Perform the following steps:

Equipment Required

None

NOTE

Allow the 373XXAto warm-up at least 30 minutes prior to performing calibration, and perform the ALC calibration (paragraph 6-3) before doing this calibration.

Procedure

Step 1. Connect a V Throughline (3670V50-2 with FF Adapter) be-

tween Ports 1 and 2.

Step 2. Set the 373XXA to sweep from 50 to 65 GHz.

Post Calibration

Actions

Step 3. Set RF power to 0 dB (default value). Step 4. Using Diagnostics menu, view Non-Ratio parameters. Step 5. View Channel 1 (Ref A) only, and activate Autoscale. Step 6. Adjust the “RA” potentiometer on top of A8 for the flattest

trace display. A small discontinuity at 56 GHz is normal.

Step 7. Perform Step 6 for each of the four Non-Ratio channels. After the calibration process is completed, perform the following ac

tions, as appropriate:

If calibration passes:

Save the calibration data to (hard) disk, as follows: Step 1. Press the Option Menu key (Enhancement key group) to dis

play the OPTIONS menu.

Step 2.

Select DIAGNOSTICS from menu.Then select in se quence: H/W CALIBRATIONS |DISK OPERATIONS

|SAVE TO HARD DISK|HW_CAL.SLT.

373XXA MM 6-13

A21A2 ADJUSTMENT (37397A) ADJUSTMENTS

NOTE

If calibration fails:

Repeat the calibration. If it still fails, then proceed to Chapter 5,

Troubleshooting.

6-8 A21A2 ADJUSTMENT

(37397A)

Calibration

Procedure

This adjustment ensures the correct RF power level will be available to drive the source quadrupler modules (SQMs). Perform these adjust ments as follows:

D454244 is replaced.

A21A2 PCB is replaced.

C21620 YIG Oscillator is replaced.

NOTE

Failure to perform this adjustment may result in intermittent operation.

Perform the following steps:

Refer to Table 1-1, located on page 1-9, for further information about the following equipment:

HP 437B Power Meter with HP 8487A Power Sensor

or:

ANRITSU ML24XXA with Version 2.02 or later, with ANRITSU Power Sensors MA2474Aand SC6230 for 50 and 65 GHz units.

or:

Gigatronics 8541/8542 with 80304APower Sensor GPIB cable, WILTRON 2100-2, or equivalent

NOTE

Allow the 373XXAand power meter to warm-up at least 30 minutes prior to performing calibration.

6-14 373XXA MM

ADJUSTMENTS A21A2 ADJUSTMENT (37397A)

Procedure

Step 1. With power off and the new part installed, disconnect the

RF cable from J4 of the Switched Filter.

Step 2. Install Power Sensor (usea6or10dBpadforprotection)

to Switched Filter J4. Step 3. Turn on the 373XXA and set it to 38 GHz, CW. Step 4. Adjust A21A2R238 for maximum power, but not over +26

dBm. Step 5. Remove the pad and sensor and reconnect the RF cable to

J4.

Post Calibration

Actions

Step 6. Perform the procedures in paragraph 6-4 and 6-5 (fre

quency and ALC calibrations). After the calibration process is completed, perform the following ac-

tions, as appropriate:

If calibration passes:

Save the calibration data to (hard) disk, as follows: Step 1. Press the Option Menu key (Enhancement key group) to dis-

play the OPTIONS menu. Step 2.

Select DIAGNOSTICS from menu.Then select in se-

quence: H/W CALIBRATIONS |DISK OPERATIONS

|SAVE TO HARD DISK|HW_CAL.SLT.

NOTE

If calibration fails:

Repeat the calibration. If it still fails, then proceed to Chapter 5, Trou bleshooting.

373XXA MM 6-15

Chapter 7 System Description

Table of Contents

Signal Source Module ·······················7-7 Test Set Module ··························7-8 A7PCB, 10 MHz Timebase ···················7-9 Receiver Module ·························7-10 A8, Source Lock/ Signal Separation and Control PCB ·····7-11 IF Section ·····························7-11 A7PCB,LO3··························7-12 A5 A/D Converter PCB······················7-12

7-4 DIGITALSUBSYSTEM ASSEMBLIES·············7-13

A9 Main Processor PCB Assembly················7-13 A13 I/O Interface #1 PCB Assembly···············7-15 A14 I/O Interface #2 PCB Assembly···············7-15 A15 Graphics Processor PCB Assembly ·············7-16 A16 Hard Disk PCB Assembly··················7-16 Floppy Disk Drive Assembly···················7-16 A24 VME Bus Terminator PCB ·················7-16

7-5 MAIN CHASSIS ASSEMBLIES·················7-16

Chapter 7 System Description

7-1 INTRODUCTION This chapter provides a brief overview of the functional assemblies

and major parts that comprise a typical Series 373XXA VNAsystem. It also briefly describes the operation of each major assembly.

7-2 SYSTEM OVERVIEW Series 373XXAVector Network Analyzers are ratio measurement sys

tems used to measure complex vector signal characteristics (real/imagi nary, magnitude/phase, etc) of devices and systems in the 22.5 MHz to 65 GHz frequency range.

The 373XXA performs these measurements by sourcing a stimulus sig nal to the Device Under Test (DUT) that is connected to the front panel Port 1 and/or Port2 connectors. (See Figure 7-1 on page 7-5). It simultaneously measures the DUT response, which consists of reflected and/or transmitted (attenuated, or amplified) signals at the connectors of the DUT. The reflected and/or transmitted signal(s) and a sample of the stimulus signal, are down converted and then transformed into their real and imaginary vector components. The resultant vector components are measured and converted into digital information. This digital information is sent to the Main Processor PCB where the desired S-parameter data is normalized and then presented to the user via the front panel color display. The display information is also sent to the rear panel VGA Out connector for use with an external VGA monitor.

The normalized measurement information is also sent to the rear panel Printer Out connector for use with an external printer and/or plotter.

A front panel keypad, a rotary knob, and an IBM compatible keyboard interface provide user interaction with 373XXA Main Processor PCB.

The system is equipped with internal hard disk and floppy disk drives and battery backed internal memories for storage and retrieval of data and front panel setup information.

The 373XXA implements an IEEE 488.2 interface. This GPIB inter face allows an externally connected instrument controller to control the 373XXA system in the “Remote-Only” mode. All 373XXAmeasure ment and input/output operations may be controlled remotely in this mode.

373XXA MM 7-3

SYSTEM OVERVIEW SYSTEM DESCRIPTION

An internal service log stores a record of system failures, data about the failures, and other key system service information. The service log is implemented using internal battery-backed SRAM memory.

7-4 373XXA MM

SYSTEM DESCRIPTION SYSTEM OVERVIEW

bias tee

PORT 1

bias tee

PORT 2

FP Amp Loop

DOWN

CONV

SIGNAL SOURCE

Step Attenuator

0-70dB

Step Attenuator

µP

YIG OSC 2-20 GHz

YIG

SWITCHED

0-40dB

DOUBLER

FILTER

SDM

LOCK DET

ALC

µP

b Loop

LVL DET

a Loop

TEST SET MODULE**

QUAD SAMPLER/BUFFER

HARM GEN

L.O. #1

L.O. #2

L.O. #3

IF / SYNC/ DET

EXTERNAL KEYBOARD

FLTR / S/H / A/D

S/H

ANALOG MUX

S/H

TO ANALOG PCB'S (CTL & DATA)

A/D

CTL

QUIET BUS

HARD

DISK

DRIVE

FLOPPY

DISK

DRIVE

FRONT

PANEL

PCB

A/D BUS

MAIN PROCESSOR PCB

µP

68030

RAM

INTERFACE

CTL

BBRAM

VME BUS

GRAPHICS

PROCESSOR

PCB

INTERNAL

VGA

MONITOR

EXT VGA MONITOR

REAR

PANEL

PCB

R.P.

LOGIC

CKTS

GPIB

INTERFACE

A/D BUS

INTERFACE

CONTROL

EXTERNAL KEYBOARD

INTERFACE

FRONT

PANEL

INTERFACE

I/O PCB'S

FLOPPY

DISK DRIVE

CONTROL

VME

INTERFACE

I/O CONTROL

LOGIC

REAR PANEL

INTERFACE

CONTROL

* pad values:

37347B and below 20dB 6db 37369B 6dB

** For Models 37377A and 37397A, see Figures 5-3 and 5-4

a channels b channels

3db

REF OSC

10 MHz

QUIET BUS

INTERFACE

CONTROL

*Model 37369A only

Figure 7-1. Overall Block Digram of 373XXA VNA System

373XXA MM 7-5

Anritsu 373XXA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Chapter 1 General Information

Chapter 2 Replaceable Parts

Chapter 3 Operational Tests

Chapter 4 Performance Verification

Chapter 5 Troubleshooting

Chapter 6 Adjustments

Chapter 7 System Description