Anritsu MG3696A, MG3695A, MG3694A, MG3693A, MG3692A Service Manual

...

SERIES

MG369XA

SYNTHESIZED SIGNAL GENERATORS

MAINTENANCE MANUAL

490 JARVIS DRIVE MORGAN HILL, CA 95037-2809

P/N: 10370-10355

REVISION: D

PRINTED: FEBRUARY 2005

WARRANTY

The Anritsu product(s) listed on the title page is (are) warranted against defects in materials and workmanship for three years from the date of shipment.

Anritsu's obligation 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.Anritsuis not liable for consequen tial damages.

LIMITATION OF WARRANTY

The foregoing warranty does not apply to Anritsu connectors that have failed due to normal 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 ACKNOWLEDGMENTS

Adobe Acrobat is a registered trademark of Adobe Systems Incorporated. MS-DOS and Windows are registered trademarks of Microsoft Corporation.

NOTICE

Anritsu Company has prepared this manual for use by Anritsu Company personnel and customers 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, specifica tions,and information is prohibited; they shall not be reproduced, copied, or used in whole or in part

Safety Symbols

To prevent the risk of personal injury or loss related to equipment malfunction, ANRITSU Company uses the following symbols to indicate safety-related information.For your own safety,please read this information carefully BEFORE operating the equipment.

Symbols used in manuals

DANGER

Indicates a very dangerous procedure that could result in serious in jury or death if not performed properly.

WARNING Indicates a hazardous procedure that could result in serious injury or

death if not performed properly.

CAUTION Indicates a hazardous procedure or danger that could result in light-

to-severe injury,or loss related to equipment malfunction, if proper precautions are not taken.

Safety Symbols Used on Equipment and in Manuals

(Some or all of the following five symbols may or may not be used on all ANRITSU equipment. In addition, there may be other labels attached to products that are not shown in the diagrams in this manual.)

The following safety symbols are used inside or on the equipment near operation locations to provide information about safety items and operation precautions. Ensure that you clearly understand the meanings of the symbols and take the necessary precautions BEFORE operating the equipment.

This symbol indicates a prohibited operation.The prohibited operation is indicated symbolically in or near the barred circle.

This symbol indicates a compulsory safety precaution. The required operation is indicated symbolically in or near the circle.

This symbol indicates warning or caution. The contents are indicated symbolically in or near the triangle.

This symbol indicates a note. The contents are described in the box.

These symbols indicate that the marked part should be recycled.

MG369XA MM Safety-1

For Safety

WARNING

Always refer to the operation manual when working near locations where the alert mark, shown on the left, is attached. If theoperation, etc.,is performed without heeding the advice in the operation manual, there is a risk of personal injury. In addition, the equipment perfor mance may be reduced.

Repair

Moreover,this alert mark is sometimes used with other marks and de scriptions indicating other dangers.

WARNING

When supplying AC power to this equipment, connect the accessory 3-pin power cord to a 3-pin grounded power outlet.If a grounded 3-pin outlet is not available, use a conversion adapter and ground the green wire,orconnect theframegroundon therearpanel of theequipmentto ground.Ifpoweris suppliedwithoutgroundingthe equipment,there is a risk of receiving a severe or fatal electric shock.

WARNING

Thisequipment cannot berepairedbythe operator.DONOTattempt to remove the equipment covers or to disassemble internal components. Only qualified service technicians with a knowledge of electrical fire andshock hazards should service this equipment.Thereare high-volt age parts in this equipment presenting a risk of severe injury or fatal electric shock to untrained personnel. In addition, there is a risk of damage to precision components.

WARNING

If this equipment is used in a manner not specified by the manufac turer, the protection provided by the equipment may be impaired.

Safety-2 MG369XA MM

Chapter 1 General Information

1-1 Scope of Manual ............................1-3

1-2 Introduction ..............................1-3

1-3 Description ...............................1-3

1-4 Identification Number .........................1-5

1-5 Online Manual .............................1-5

1-6 Related Manuals ............................1-5

Operation Manual ······················1-5

GPIB Programming Manual ·················1-5

1-7 Options .................................1-5

1-8 Level of Maintenance .........................1-6

Troubleshooting ·······················1-6

Repair ····························1-6

Calibration··························1-6

Preventive Maintenance ···················1-6

1-9 Component Handling .........................1-6

1-10 Preventive Maintenance........................1-8

1-11 Startup Configurations ........................1-9

1-12 Recommended Test Equipment ...................1-10

MG369XA MM i

Table of Contents (Continued)

Chapter 2 Functional Description

2-1 Introduction ..............................2-3

2-2 Major Subsystems ...........................2-3

Digital Control ························2-3 Front Panel Assembly ····················2-4 Frequency Synthesis ·····················2-4 A9 YIG Assembly·······················2-5 ALC/AM/Pulse Modulator···················2-5 RFDeck···························2-5 Power Supply ························2-5 Inputs/ Outputs ·······················2-6 Motherboard/ Interconnections ················2-6

2-3 Frequency Synthesis ..........................2-9

Phase Lock Loops ······················2-9 Overall Operation ······················2-10 RF Outputs 0.01 MHz to 65 GHz ··············2-14 Frequency Modulation····················2-15 Phase Modulation ······················2-15 Analog Sweep Mode ·····················2-16 Step Sweep Mode ······················2-16

2-4 ALC/AM/Pulse Modulation......................2-17

ALC Loop Operation ····················2-17 Pulse Generator Operation ·················2-19

2-5 RF Deck Assemblies .........................2-20

RF Deck Configurations ···················2-20 YIG-tuned Oscillator ····················2-21 RF Signal Filtering ·····················2-22

0.01 to 2 GHz Down Converter (Option 5) ··········2-23

0.01 to 2.2 GHz Digital Down Converter (Option 4) ·····2-23 Switched Doubler Module ··················2-24 Source Quadrupler Module ·················2-25 Step Attenuators ······················2-26

ii MG369XA MM

Table of Contents (Continued)

Chapter 3 Performance Verification

3-1 Introduction ..............................3-3

3-2 Test Records ..............................3-3

3-3 Connector and Key Notation......................3-4

3-4 Recommended Test Equipment ....................3-4

3-5 Measurement Uncertainty.......................3-4

3-6 Internal Time Base Aging Rate Test .................3-6

3-7 Spurious Signals Test .........................3-9

3-8 Single Sideband Phase Noise Test ..................3-11

3-9 Power Level Accuracy and Flatness Tests ..............3-19

Power Level Log Conformity·················3-20

Power Level Accuracy (³ –60 dBm) ·············3-22

Power Level Accuracy (< –60 dBm) ·············3-23

Power Level Flatness ····················3-26

Maximum Leveled Power ··················3-27

3-10 Residual FM Tests ..........................3-28

Locked FM Mode Off ····················3-29

Locked FM Mode On ····················3-30

Unlocked Narrow FM Mode On ···············3-30

Unlocked Wide FM Mode On ················3-31

3-11 Frequency Modulation Tests .....................3-32

FM Attenuator ·······················3-33

Locked FM Accuracy ····················3-41

FM Accuracy ························3-50

Unlocked Narrow FM Accuracy ···············3-59

FM/FM Flatness ······················3-61

FM/FM Bandwidth ·····················3-68

Alternate FM and FM Accuracy Tests ············3-75

MG369XA MM iii

Table of Contents (Continued)

3-12 Amplitude Modulation Tests .....................3-83

External AM Accuracy ···················3-84 Internal AM Accuracy ····················3-86 AM Roll Off ·························3-88 AM Flatness ························3-90

3-13 Pulse Modulation Tests........................3-92

Rise Time, Fall Time and Overshoot ·············3-94 Pulse Power Accuracy ····················3-97 Pulse On/Off Ratio ·····················3-100

Chapter 4 Calibration

4-1 Introduction ..............................4-3

4-2 Recommended Test Equipment ....................4-3

4-3 Test Records ..............................4-3

4-4 Subassembly Replacement.......................4-4

4-5 Connector and Key Notation......................4-4

4-6 Initial Setup ..............................4-6

Interconnection························4-6 PC Setup···························4-7

4-7 Preliminary Calibration .......................4-10

Equipment Setup ······················4-10 Calibration Steps ······················4-11 Alternate 10 MHz

Reference Oscillator Calibration ··············4-14

4-8 Frequency Synthesis Tests ......................4-16

Coarse Loop/ YIG Loop ···················4-16 Fine Loop ··························4-17

4-9 Switched F ilter Shaper ........................4-18

Equipment Setup ······················4-18 Log Amplifier Zero Calibration ···············4-19 Limiter DAC Adjustment ··················4-19 Shaper DAC Adjustment ··················4-21

iv MG369XA MM

Table of Contents (Continued)

4-10 RF Level Calibration .........................4-22

4-11 ALC Bandwidth Calibration .....................4-25

Equipment Setup ······················4-25

Bandwidth Calibration ···················4-26

4-12 ALC Slope Calibration ........................4-27

Equipment Setup ······················4-27

ALC Slope DAC Adjustment·················4-28

4-13 AM Calibration ............................4-31

Equipment Setup ······················4-31

AM Calibration Procedure··················4-32

4-14 FM Calibration ............................4-34

Equipment Setup ······················4-34

FM Calibration Procedure ··················4-35

Chapter 5 Troubleshooting

5-1 Introduction ..............................5-3

5-2 Recommended Test Equipment ....................5-3

5-3 Error Messages.............................5-3

Self-Test Error Messages ···················5-3

Normal Operation Error and Warning/Status Messages ····5-7

5-4 No Error Message...........................5-10

5-5 Troubleshooting Tables........................5-10

Chapter 6 Removal and Replacement Procedures

6-1 Introduction ..............................6-3

6-2 Exchange Assembly Program .....................6-3

6-3 Chassis Covers ............................6-10

6-4 Front Panel Assembly ........................6-12

6-5 A2 Microprocessor PCB Board ....................6-13

6-6 A3 Reference/Fine Loop PCB.....................6-14

6-7 A4 Coarse Loop PCB .........................6-15

MG369XA MM v

Table of Contents (Continued)

6-8 A5—A9 PCB Removal ........................6-17

Card Cage Cover ······················6-17 A5 Auxiliary PCB ·····················6-18 A6ALCPCB························6-18 A7YIGLockPCB······················6-19 A8DDSPCB························6-19 A9 YIG Assembly ······················6-19

6-9 Power Supply Assembly .......................6-20

Power Supply Top Assembly·················6-20 12 Volt Power Supply PCB ·················6-21 Power Supply Regulator PCB ················6-22

6-10 Anritsu Customer Service Centers..................6-24

Appendix A Test Records

A-1 Introduction ..............................A-1

A-2 Uncertainty Specifications ......................A-1

A-3 Test Records ..............................A-1

Appendix B Performance Specifications

B-1 MG369XA Technical Data Sheet ...................B-1

vi MG369XA MM

Table of Contents

1-1 Scope of Manual ............................1-3

1-2 Introduction ..............................1-3

1-3 Description ...............................1-3

1-4 Identification Number .........................1-5

1-5 Online Manual .............................1-5

1-6 Related Manuals ............................1-5

Operation Manual ······················1-5

GPIB Programming Manual ·················1-5

1-7 Options .................................1-5

Chapter 1 General Information

1-8 Level of Maintenance .........................1-6

Troubleshooting ·······················1-6

Repair ····························1-6

Calibration··························1-6

Preventive Maintenance ···················1-6

1-9 Component Handling .........................1-6

1-10 Preventive Maintenance........................1-8

1-11 Startup Configurations ........................1-9

1-12 Recommended Test Equipment ...................1-10

Figure 1-1.

Typical Series MG369XA Synthesized Signal Generator (Model MG3692A Shown)

1-2 MG369XA MM

Chapter 1 General Information

1-1 Scope of Manual This manual provides service information for the Model MG369XA

Signal Generators. The service information includes replaceable parts information, troubleshooting, performance verification tests, calibra tion procedures, functional circuit descriptions and block diagrams, and assembly/subassembly removal and replacement. Throughout this manual, the terms MG369XA or synthesizer are used to refer to the in strument. Manual organization is shown in the table of contents.

1-2 Introduction This chapter provides a general description of the MG369XA identifi

cation numbers, related manuals, and options. Information is included concerning level of maintenance, replaceable subassemblies and RF components, exchange assembly program, and preventive maintenance. Static-sensitive component handling precautions and lists of exchangeable subassemblies and recommended test equipment are also provided.

1-3 Description The series MG369XA is a microprocessor-based, synthesized signal

source with high resolution phase-lock capability. It generates both discrete CW frequencies and broad (full range) and narrow band step sweeps across the frequency range of 2 GHz to 65 GHz. Options are available to extend the low end of the frequency range to 0.1 Hz. All functions of the CW generator are fully controllable locally from the front panel or remotely (except for power on/standby) via the IEEE-488 General Purpose Interface Bus (GPIB).Table 1-1 on page 1-4 lists models, frequency ranges, and maximum leveled output power.

MG369XA MM 1-3

Description General Information

Table 1-1. Series MG369XA Models

Max Leveled

Model

Number Configuration

Frequency

Range

Max Leveled

Output Power

Max Leveled

Output Power

w/Step Attenuator

Output Power

w/Electronic

Step Attenuator

MG3691A

MG3692A

MG3693A

MG3694A

MG3695A

MG3696A

w/opt 4 w/opt 5

Standard

w/opt 4

w/opt 5 Standard Standard

w/opt 4

w/opt 5 Standard Standard

w/opt 4

w/opt 5 Standard Standard

w/opt 4

w/opt 5 Standard Standard

w/opt 4

w/opt 5 Standard Standard

³0.01 – £2.2 GHz ³0.01 – £2.0 GHz

³2.0 – £8.4 GHz

³0.01 – £2.2 GHz ³0.01 – £2.0 GHz

³2.0 – £8.4 GHz

>8.4 – £20.0 GHz ³0.01 – £2.2 GHz

³0.01 – £2.0 GHz ³2.0 – £20.0 GHz

>20.0 – £30.0 GHz

³0.01 – £2.2 GHz ³0.01 – £2.0 GHz ³2.0 – £20.0 GHz

>20.0 – £40.0 GHz

³0.01 – £2.2 GHz ³0.01 – £2.0 GHz ³2.0 – £20.0 GHz

>20.0 – £50.0 GHz

³0.01 – £2.2 GHz ³0.01 – £2.0 GHz ³2.0 – £20.0 GHz

>20.0 – £65.0 GHz

With Option 15 (High Power) Installed

+17.0 dBm +17.0 dBm +13.0 dBm

+17.0 dBm +17.0 dBm +13.0 dBm +13.0 dBm

+13.0 dBm +13.0 dBm

+9.0 dBm +6.0 dBm

+13.0 dBm +13.0 dBm

+9.0 dBm +6.0 dBm

+12.0 dBm +12.0 dBm +10.0 dBm

+3.0 dBm

+12.0 dBm +12.0 dBm +10.0 dBm

+3.0 dBm

+15.0 dBm +15.0 dBm +11.0dBm

+15.0 dBm +15.0 dBm +11.0dBm +11.0dBm

+11.0dBm +11.0dBm

+7.0 dBm +3.0 dBm

+11.0dBm +11.0dBm

+7.0 dBm +3.0 dBm

+10.0 dBm +10.0 dBm

+8.0 dBm +0.0 dBm

+10.0 dBm +10.0 dBm

+8.0 dBm

+0.0 dBm

+13.0 dBm +13.0 dBm

+9.0 dBm

+13.0 dBm +13.0 dBm

+9.0 dBm +3.0 dBm

Not Available

w/opt 4

MG3691A

MG3692A

MG3693A

MG3694A

Note: In models with Option 22, rated output power is reduced by 2 dB.

* Typical 60 - 65 GHz.

w/opt 5 Standard

w/opt 4

w/opt 5 Standard Standard

w/opt 4

w/opt 5 Standard Standard Standard

Option 4 Option 5 Standard Standard Standard

³0.01 – £2.2 GHz ³0.01 – £2.0 GHz

³2.0 – £8.4 GHz

³0.01 – £2.2 GHz ³0.01 – £2.0 GHz ³2.0 – £10.0 GHz

>10.0 – £20.0 GHz

³0.01 – £2.2 GHz ³0.01 – £2.0 GHz

³2.0 – £10.0 GHz >10.0 – £20.0 GHz >20.0 – £30.0 GHz

³0.01 – £2.2 GHz

³0.01 – £2.0 GHz

³2.0 – £10.0 GHz >10.0 – £20.0 GHz >20.0 – £40.0 GHz

+19.0 dBm +19.0 dBm +19.0 dBm

+19.0 dBm +19.0 dBm +19.0 dBm +17.0 dBm

+15.0 dBm +15.0 dBm +15.0 dBm +12.0 dBm +14.0 dBm

+18.0 dBm +18.0 dBm +18.0 dBm

+18.0 dBm +18.0 dBm +18.0 dBm +15.0 dBm

+14.0 dBm +14.0 dBm +14.0 dBm +10.0 dBm +12.0 dBm

+15.0 dBm +15.0 dBm +13.0 dBm

+7.0 dBm

Not Available

1-4 MG369XA MM

General Information Identification Number

1-4 Identification Number All Anritsu instruments are assigned a unique six-digit ID number,

such as “875012.” The ID number is imprinted on a decal that is af fixed to the rear panel of the unit. Special-order instrument configura tions also have an additional special number tag attached to the rear panel of the unit, such as SM1234.

When ordering parts or corresponding with Anritsu customer service, please use the correct serial number with reference to the specific in strument's model number (i.e., Model MG3692A CW Signal Generator, Serial No. 875012, and the special's number, if appropriate).

1-5 Online Manual This manual is available on CD ROM as an Adobe Acrobat Portable

Document Format (*.pdf) file. The file can be viewed using Acrobat Reader, a free program that is also included on the CD ROM. The file is “linked” such that the viewer can choose a topic to view from the dis played “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.

1-6 Related Manuals This is one of a three manual set that consists of an operation manual,

a GPIB programming manual, and a maintenance manual.

Operation Manual

GPIB Programming Manual

1-7 Options The options available for the Anritsu MG369XA series signal genera

tors are described in the product data sheet (p/n 11410-00327). A copy of this data sheet is located in Appendix B.

The operation manual provides instructions for operating the MG369XA using the front panel controls. It also includes general information, performance specifications, installation instructions, and operation verification procedures. The Anritsu part num ber for the Model MG369XA Operation Manual is 10370-10353.

The GPIB programming manual provides informa tion for remotely operating the MG369XA using product specific commands sent from an external controller via the IEEE 488 General Purpose Inter face Bus (GPIB). It contains a complete listing and description of all MG369XA GPIB product specific commands and several programming examples. The Anritsu part number for the Model MG369XA GPIB Programming Manual is 10370-10354.

MG369XA MM 1-5

Level of Maintenance General Information

1-8 Level of Maintenance Maintenance of the MG369XA consists of:

Troubleshooting the instrument to a replaceable subassembly or

RF component Repair by replacing the failed subassembly or RF component.

Calibration

Preventive maintenance

Trouble shooting

Repair Most instrument failures are field repairable by re-

Calibration The MG369XA may require calibration after repair.

Preventive Maintenance

The MG369XA firmware includes internal diagnos tics that self-test most of the internal assemblies. When the MG369XA fails self-test, one or more error messages appear to aid in troubleshooting the fail ure to a replaceable subassembly or RF component. Chapter 5—Troubleshooting lists and describes the self-test error messages and provides procedures for isolating MG369XA failures to a replaceable subas sembly or RF component.

placing the failed subassembly or RF component. Detailed instructions for removing and replacing failed subassemblies and components are provided in Chapter 6—Removal and Replacement Procedures.

Refer to Chapter 4—Calibration for a listing of requirements and procedures.

Preventive maintenance on the MG369XA consists of cleaning the fan honeycomb filter, described in Section 1-10.

1-9 Component Handling The MG369XA contains components that can be damaged by static

electricity.Figure 1-2 illustrates the precautions that should be fol lowed when handling static-sensitive subassemblies and components. If followed, these precautions will minimize the possibilities of static-shock damage to these items.

NOTE

Use of an grounded wrist strap when handling subassem blies or components is strongly recommended.

1-6 MG369XA MM

General Information Component Handling

1. Do not touch exposed contacts on any static sensitive component.

4. Wear a static-discharge wristband when working with static sensitive components.

2. Do not slide static sensitive component across any surface.

5. Label all static sensitive devices.

3. Do not handle static sensitive components in areas where the floor or work surface covering is capable of generating a static charge.

6. Keep component leads shorted together whenever possible.

7. Handle PCBs only by their edges. Do not handle by the edge connectors.

10. Additional Precautions: Keep work spaces 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 Precautions

8. Lift & handle solid state de vices by their bodies – never by their leads.

9. Transport and store PCBs and other static sensitive devices in static-shielded containers.

MG369XA MM 1-7

Preventive Maintenance General Information

1-10 Preventive

Maintenance

The MG369XA must always receive adequate ventilation.A blocked fan filter can cause the instrument to overheat and shut down. Check and clean the rear panel fan honeycomb filter periodically.Clean the fan honeycomb filter more frequently in dusty environments. Clean the filter as follows.

Step 1. Use a #3 screwdriver to remove the four screws that

fasten the filter guard to the rear panel (see Figure 1-3). Retain the screws for reassembly.

Step 2. Vacuum the honeycomb filter to clean it. Step 3. Reinstall the filter guard. Step 4. Fasten the filter guard to the rear panel using the

four screws that were removed in Step 1.

Figure 1-3. Removing/Replacing the Fan Filter Guard

1-8 MG369XA MM

General Information Startup Configurations

1-11 Startup

Configurations

The MG369XA comes from the factory with a jumper across pins 2 and 3 of the A2 microprocessor PCB connector JP1 (Figure 1-4). In this configuration, connecting the instrument to line power automatically places it in operate mode (front panel OPERATE LED on).

The startup configuration can be changed so that the signal generator comes up in standby mode (front panel STANDBY LED on) when it is connected to line power.Change the startup configuration as follows:

Step 1. Disconnect the instrument from line power. Step 2. Remove the top cover from the MG369XA and A2

PCB.Refer to Section 6-5 for instructions.

Step 3. Locate the connector JP1 and remove the jumper

from across pins 2 and 3.Refer to Figure 1-4 below.

Step 4. Install the jumper across pins 1 and 2 of the connec-

tor JP1.

Step 5. Install the top covers and connect the signal genera-

tor to line power.The instrument should come up in standby mode.

Figure 1-4. Startup Configuration of A2 Connector JP1

MG369XA MM 1-9

Recommended Test Equipment General Information

1-12 Recommended Test

Equipment

Table 1-2 provides a list of recommended test equipment needed for the performance verification, calibration, and troubleshooting proce dures presented in this manual.

Table 1-2. Recommended Test Equipment

INSTRUMENT

Spectrum Analyzer

Phase Noise Measure ment System

Modulation Analyzer

Frequency Counter

Power Meter with Power Sensor

Power Supply Output: +1V DC Agilent E3631A P Digital Multimeter Function Generator DDS, 0.01 to 10 MHz Agilent 33120A C, P

Digital Sampling Oscilloscope Measuring Receiver Noise Floor: <–140 dBm @ 500 MHz Anritsu Model ML2530A C, P

Frequency Reference

Local Oscillator Frequency: 0.01 to 40 GHz Local Oscillator

(Level Calibration) Scalar

Network Analyzer with RF Detector

Diplex Switch Assembly

Mixer * P = Performance Verification Tests; C = Calibration; T = Troubleshooting

Frequency: 0.01 to 50 GHz Resolution Bandwidth: 10 Hz

Frequency Range: 5 MHz to 26.5 GHz

See Table 3-2 on page 3-11

AM and FM Measurement Capability to >500 MHz and –20 dBm Frequency Range: 0.01 to 40 GHz Input Impedance: 50W Resolution: 1 Hz Other: External Time Base Input

Frequency: 0.01 to 65 GHz Power Range: –70 to +20 dBm

Minimum 1% RMS ACV Accuracy at 100 kHz

Frequency: 50 GHz

Frequency: 10 MHz Accuracy:5x10

Frequency: 0.01 to 40 GHz

Frequency: 0.01 to 60 GHz

Frequency Range: 0.1 Hz to 10 MHz Frequency Range: 0.01 to 40 GHz Frequency Range: 500 MHz to 40 GHz Conversion Loss: 10 dB (typical)

CRITICAL

SPECIFICATION

–12

(1 of 2)

parts/day

RECOMMENDED

MANUFACTURER/MODEL

HP8565E C, P Aeroflex/Comstron PN9000 with:

PN9060-00 Status Module PN9470-00 Noise Output Module PN9450-00 Lock Control Module PN9342-00 Phase Detector Module PN9530-00 Crystal Oscillator Module

HP8901A P

Anritsu Model MF2414B C, P

Anritsu Model ML2437A/38A with Power Sensor:

MA2421A (100 kHz to 18 GHz) MA2474A (0.01 to 40 GHz) SC6230 (0.01 to 65 GHz)

Fluke 8840A C, P

Agilent 86100A with:

83484A 50 GHz Module

Absolute Time Corp., Model 300 C, P Anritsu Model MG3694A with:

Options 3, 4 and 15

Anritsu Model 69067B with:

Option 14 and SM5709

Anritsu Model 56100A with RF Detector:

560-7K50 (0.01 to 40 GHz) 560-7VA50(0.01 to 50 GHz)

SC5198 (0.01 to 60 GHz) Anritsu P/N: 46504 Anritsu P/N: 29850

Anritsu P/N: 60-114 C, P

USAGE*

C, P

C, T

1-10 MG369XA MM

General Information Recommended Test Equipment

Table 1-2.

INSTRUMENT

Attenuator

Adapter

2.4 mm (m) to K (f) Adapter

3.5 mm (m) to BNC (f) Feed Through Termination Tee Connectors: 50W BNC Any common source P

Cables

AUX I/O Interface Cable

Special AUX I/O Cable Assembly Serial Interface Assembly

Personal Computer

Level Calibration Software

* P = Performance Verification Tests; C = Calibration; T = Troubleshooting

Recommended Test Equipment (2 of 2)

CRITICAL

SPECIFICATION

Frequency Range: DC to 40 GHz Max Input Power: >+20 dBm Attenuation: 3, 6, 10, and 20 dB

Frequency Range: DC to 60 GHz Max Input Power: >+20 dBm Attenuation: 10 dB

Frequency Range: 0.01 to 40 GHz

50W Any common source P

50W BNC Any common source P

Connectors: 50W BNC RF Connections: K-Cables Provides interface between the MG369XA and the 56100A Scalar Network Analyzer Provides interface between the MG369XA and the Power Meter Provides serial interface between the PC and the MG369XA

IBM AT or compatible with GPIB interface

Provides automated power level cali bration of the MG369XA

RECOMMENDED

MANUFACTURER/MODEL

Anritsu, Model 41KC-3 Anritsu, Model 41KC-6 Anritsu, Model 41KC-10 Anritsu, Model 41KC-20

Anritsu, Model 41V-10 C

Any common source (Agilent P/N: 11904-60003)

Any common source C, P

Anritsu P/N:806-7 C

Anritsu P/N: 806-97 P

Anritsu P/N: T1678 C PC: Any common source

GPIB Interface: National Instruments P/N:

PCI-GPIB (Desktop) PCMCIA-GPIB (Notebook)

Anritsu P/N: 2300-497 C

USAGE*

C, P

MG369XA MM 1-11/1-12

Table of Contents

2-1 Introduction ..............................2-3

2-2 Major Subsystems ...........................2-3

Chapter 2 Functional Description

Motherboard/ Interconnections ················2-6

2-3 Frequency Synthesis ..........................2-9

2-4 ALC/AM/Pulse Modulation......................2-17

ALC Loop Operation ····················2-17 Pulse Generator Operation ·················2-19

Table of Contents (Continued)

2-5 RF Deck Assemblies .........................2-20

RF Deck Configurations ···················2-20 YIG-tuned Oscillator ····················2-21 RF Signal Filtering ·····················2-22

0.01 to 2 GHz Down Converter (Option 5) ··········2-23

2-2 MG369XA MM

Chapter 2 Functional Description

2-1 Introduction This chapter provides brief functional descriptions of the major sub

systems that are contained in each model of the MG369XA.In addi tion, the operation of the frequency synthesis, automatic level control (ALC), and RF deck subsystems is described so that the reader may better understand the overall operation of the instrument. Block dia grams are included to supplement the written descriptions.

2-2 Major Subsystems The MG369XA circuitry consists of various distinct subsystems that

are contained on one or more printed circuit board (PCB) assemblies or in microwave components located on the RF deck. The following paragraphs identify the subsystems that make up the instrument and provide a brief description of each.Figure 2-1 (page 2-7) is an overall block diagram of a typical MG369XA.

Digital Control

This circuit subsystem consists of the A2 Microprocessor PCB. The central processor unit (CPU) located on this PCB is the main controller for the MG369XA. This controller directly or indirectly controls all functions of the instrument.The CPU contains memory that stores the main operating system components and instrument firmware, instrument calibration data, and front panel setup data during the power-off condition. It has a GPIB interface that allows it to communicate with external devices over the GPIB and a serial interface to a serial terminal port on the rear panel. The CPU is directly linked via a dedicated data and address bus to the front panel assembly,the A5 Auxiliary/Analog Instruction PCB,the A6 ALC PCB, the A7 Yig-lock PCB, the A9 YIG assembly, the optional A8 DDS PCB of the CW Generator or Function Generator of the Signal Generator, and the A13 Pulse Generator PCB.

Interface circuits on the A2 PCB indirectly link the CPU to the A3 reference/fine loop PCB, and the A4 coarse loop PCB. The A2 PCB contains circuits that perform parallel-to-serial and serial-to-parallel data conversion. The A2 also contains circuitry for many of the rear panel signals and a 13-bit resolution digi tal volt meter (DVM).

MG369XA MM 2-3

Major Subsystems Functional Description

Front Panel Assembly

Frequency Synthesis

This circuit subsystem consists of the front panel, the front panel rotary data knob,the front panel control PCB, and the liquid crystal display (LCD). The subsystem interfaces the front panel LCD, light emitting diodes (LEDs), and keys to the CPU via the dedicated data and address bus. The front panel ro

tary data knob is also linked to the CPU via the data and address bus.

The front panel PCB contains the keyboard matrix conductive rubber switches. It has circuits to control the LCD dot-matrix display, turn the front panel LEDs on and off, and convert keyboard switch ma

trix signals to parallel key code.It also contains the standby/operate line switch and the optical encoder for the rotary data knob.

The frequency synthesis subsystem consists of the A3 reference/fine loop PCB, the A4 coarse loop PCB, the A7 YIG lock PCB, and the A9 YIG assembly. It provides the reference frequencies and phase lock circuits for precise control of the YIG-tuned oscillator frequencies, as follows:

The reference loop circuitry located on the A3 PCB supplies the stable 10 MHz and 500 MHz reference frequency signals for the rest of the frequency synthesis system

The A4 coarse loop PCB generates coarse tun

ing frequencies of 219.5 to 245 MHz for use by the YIG lock PCB

The fine loop circuitry located on the A3 PCB provides fine tuning frequencies of 21.5 to 40 MHz for use by the YIG lock PCB

The A7 YIG lock PCB performs phase detec tion of the YIG-tuned oscillator's output fre

quency and provides a YIG loop error voltage signal. This error signal is further conditioned, producing a correction signal that is used to fine tune and phase lock the YIG-tuned oscillator

The CPU sends control data to the A3 reference/ fine loop PCB and the A4 coarse loop PCB as serial data words. Refer to Section 2-3 for a functional overview of the frequency synthesis subsystem.

2-4 MG369XA MM

Functional Description Major Subsystems

A9 YIG Assembly

ALC/AM/Pulse Modulator

The A9 YIG assembly contains the YIG-tuned oscil lator and associated PCB assembly.The PCB assem bly contains the driver circuitry that provides the tuning current and bias voltages for the YIG-tuned oscillator. The CPU controls the A9 YIG assembly via the dedicated data and address bus.

This ALC circuit subsystem consists of the A6 ALC PCB,the A6A1 AM module, and part of the A9 YIG PCB assembly.It provides the following:

Level control of the RF output power

Current drive signals to the PIN switches lo

cated in the A10 switched filter assembly (SWF), the A12 switched doubler module (SDM), and the source quadrupler module (SQM) Drive signals for the step attenuator (Option 2)

and the diplexers (used with Option 22)

The CPU controls the A6 ALC PCB (and the A6A1 AM module via the A6 PCB) and the A9 YIG PCB assembly via the dedicated data and address bus. It sends control data to the A13 Pulse Generator PCB via the A1 Motherboard as serial data words. Refer to Section 2-4 for a functional overview of the ALC subsystem.

RF Deck This subsystem contains those elements related to

the generation, modulation, and control of the sweep- and CW-frequency RF signals. These ele

ments include the A9 YIG-tuned oscillator/PCB as sembly,the 0.01 to 2 GHz down converter assembly (A11), the A10 switched filter assembly, the A12 switched doubler module, the source quadrupler module, the directional coupler/level detector, and the optional step attenuator.Refer to Section 2-5 for a functional overview of the RF deck subsystem.

Power Supply The power supply subsystem consists of the power

input connector/filter module, the regulator PCB, the power supply PCB, the standby power supply PCB, and the power module fan unit.It supplies all the regulated DC voltages used by the MG369XA cir

cuits. The voltages are routed throughout the instru ment via the motherboard PCB.

MG369XA MM 2-5

Major Subsystems Functional Description

Inputs/ Outputs

The A21 rear panel PCB and the A2 microprocessor PCB contain the interface circuits for the majority of the rear panel input and output connectors, includ ing the AUX I/O connector.

The A5 Auxiliary PCB (or the optional A5 Analog In struction PCB) provides a 0V to +10V ramp signal to the rear panel HORIZ OUT connector,a V/GHz signal to the rear panel AUX I/O connector,and a SLOPE signal to the A6 ALC PCB for slope-vs-frequency cor rection of the RF output power.

The rear panel EXT ALC IN, AM IN, and AM OUTare routed through the A21 rear panel PCB, and then through the motherboard PCB to the A6 ALC PCB. The rear panel connectors, 10 MHz REF OUT and 10 MHz REF IN, are routed through the A21 PCB and coupled to the A3 Reference/Fine Loop PCB via coaxial cables.

The rear panel FM/FMINandFM/FM OUT connec- tors are routed through the A21 rear panel PCB and then through the Motherboard PCB to the A7 YIG-lock PCB. The rear panel PULSE TRIG IN connector is routed through the A21 rear panel PCB and then to the A6 ALC PCB (or optional A13 Pulse Generator PCB for units with Option 24 installed). The rear panel PULSE SYNC OUT and PULSE VIDEO OUT connectors are routed through the A21 rear panel PCB, and then to the optional A13 Pulse Generator PCB via coaxial cables. The rear panel EFC IN connector is routed to the A3 Reference/Fine Loop PCB via coaxial cables.

Motherboard/ Interconnections

The rear panel IEEE-488 GPIB and SERIAL I/O con nectors are routed through the A21 rear panel PCB and then through the motherboard to the A2 micro processor PCB.

The motherboard PCB and associated cables provide the interconnections for the flow of data, signals, and DC voltages between all internal components and assemblies throughout the MG369XA.

2-6 MG369XA MM

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