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

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Page 1

SERIES

MG369XA

SYNTHESIZED SIGNAL GENERATORS

MAINTENANCE MANUAL

490 JARVIS DRIVE MORGAN HILL, CA 95037-2809

P/N: 10370-10355

REVISION: D

PRINTED: FEBRUARY 2005

Page 2

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

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Page 4

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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

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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

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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

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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

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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

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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

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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

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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

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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

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Figure 1-1.

Typical Series MG369XA Synthesized Signal Generator (Model MG3692A Shown)

1-2 MG369XA MM

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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

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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

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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

Page 18

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

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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

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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

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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

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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

Page 23

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

Page 24

Page 25

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

Page 26

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

Page 27

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

Page 28

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

Page 29

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

Page 30

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

Page 31

Functional Description Overall Block Diagram

(

)

Connectors

RF OUTPUT

Front Panel Assembly

Front

Panel

Front Panel

LCD

Control

From RF Deck

EFC IN

From RF Deck

(Option 9)

10 MHz REF IN

From A3

Reference Loop

PULSE TRIG IN

From A5 Auxilliary

FM/ M IN

AM IN

EXT ALC IN

AUX

I/O

earPane

OutputsInputs

To A 3 Reference Loop

RF OUTPUT

To A 3 Reference Loop

10 MHZ REF OUT

To A6 ALC

HORIZ OUT

AM OUT

PULSE SYNC OUT

PULSE VIDEO OUT

FM/ M OUT

Power Input

Main

Power

Supply

(PSU)

Standby

P. S .

110/220 VAC

Line Filter

Power Supply Assembly

+6.75

+26

+16.25

-16.25

PSU Inhibit

+13

Regulator

A20 PCB

+5V-STANDBY

+5V

+3.3V

+15V

-15V

+24V

+8V

+7V

+10V

+12V

12V-STANDBY

Serial Data

Keyboard

Matrix

Line

Switch

Rotary

Data

Knob

Keyboard

Encoder

Line

Switch

Logic

Optical

Encoder

Front Panel

Control

5V (From A20 PCB)

SERIAL

I/O

PSU Inhibit

Phase A / Phase B Data

A21

BNC/AUX

I/O Connector

PCB

IEEE-488

Rear Panel Pulse Signals

Rear Panel Signals

Serial I/O

GPIB Bus

Data and Address Bus

A2 Microprocessor PCB

CPU

Interface

CPU

Digital

Control

Continued on Sheet 2

Figure 2-1. Block Diagram of a Typical MG369XA Synthesized

Signal Generator (Sheet 1 of 2).

MG369XA MM 2-7

Page 32

Serial Data

(

)

Overall Block Diagram Functional Description

10 MHz REF IN (Real Panel)

Serial Data

Reference

Loop

Fine Loop

DDS

10 MHz

HI-STAB

XTAL OSC

16)

(Option

A9 YIG Module

Driver

YIG Control (From A5 PCB)

Rear Panel Pulse Signals

Serial Data

10 MHz

(From A3)

10 MHz

(From A3)

10 MHz (100 MHz for Option 3)

500 MHz

10 MHz

21.5 - 40 MHz

Tune

Main

Bias

To A11

To A13

To A 8

26.8435456 MHz to A8* (Option 22)

Tune (YIG Error)

2-20GHz

YIG

Oscillator

A13

Pulse

Generator

Function

Generator

Sample/Hold

FM (To A7A1)

Internal AM

FM Out

AM Out

Coarse

Loop

219.5 - 245 MHz

YIG Loop

Sampled 2-20GHz RF

Level

Control

FM/ M Signal

(From A21)

A7A1

FM Module

(From A8)

A10 Switched Filter Module

3.3 GHz LPF

5.5 GHz LPF

8.5 GHz LPF

6.51 - 8.5 GHz

8.4 GHz LPF

13.5 GHz LPF

A11 Down Converter

500 MHz

(From A3)

0.01 - 2 GHz RF

Auxiliary/Analog

Instruction

YIG Control

(To A9 YIG Module)

0.01 - 2 GHz

Detected

0.01 - 20 GHz

20 GHz LPF

Switch Control

SDM Bias

A6A1

Module

A6 ALC

Control

A12 Switched Doubler Module

20-25GHz

25-32GHz

32-40GHz

Switch Control

Detected

2-40GHzRF

0.01 40 GHz

0.01 - 10 MHz (To RF Deck via Diplexers)

A8*

10 MHz

DDS

(Option 22)

RF Deck

Directional Coupler

* The A8 10 MHz DDS PCB

only exists in vintage models and has been incorporated into the A3 PCB in later models.

110 d B

Attenuator (Option 2)

Step

Attenuator

Control

Step

RF Output

0.01 - 40 GHz

Rear Panel Signals

Data And Address Bus

Continued From Sheet 1

ALC

26.8435456 MHz (From A3)

Figure 2-1. Block Diagram of a Typical MG369XA Synthesized Signal Generator (Sheet 2 of 2).

2-8 MG369XA MM

Page 33

Functional Description Frequency Synthesis

2-3 Frequency Synthesis The frequency synthesis subsystem provides phase-lock control of the

MG369XA output frequency. It consists of four phase-lock loops, the reference loop, the coarse loop, the fine loop, and the YIG loop. The four phase-lock loops, operating together, produce an accurately syn thesized, low-noise RF output signal. Figure 2-2 (page 2-11) is an over all block diagram of the frequency synthesis subsystem. The following paragraphs describe phase-lock loops and the overall operation of the frequency synthesis subsystem.

Phase Lock Loops

The purpose of a phase-lock loop is to control the fre quency of a variable oscillator in order to give it the same accuracy and stability as a fixed reference os cillator. It works by comparing two frequency inputs, one fixed and one variable, and supplying a correc tion signal to the variable oscillator to reduce the difference between the two inputs. For example, sup pose we have a 10 MHz reference oscillator with a stability of1x10 stability to a voltage controlled oscillator (VCO). The 10 MHz reference signal is applied to the reference input of a phase-lock loop circuit.The signal from the VCO is applied to the variable input. A phase detector in the phase-lock loop circuit compares the two inputs and determines whether the variable input waveform is leading or lagging the reference. The phase detector generates a correction signal that (depending on polarity) causes the VCO frequency to increase or decrease to reduce any phase difference. When the two inputs match, the loop is said to be locked. The variable input from the VCO then equals the reference input in phase, frequency, accuracy,and stability.

In practical applications a frequency divider is placed between the output of the variable oscillator and the variable input to the phase-lock loop. The circuit can then be used to control a frequency that is an exact multiple of the reference frequency. In this way, the variable oscillator acquires the stability of the reference without equaling its frequency. In the A3 reference loop, the 100 MHz VCXO can be controlled by the phase-lock loop using a 10 MHz reference. This is because a divide-by-ten circuit is between the VCXO's output and the variable input to the phase-lock loop. Both inputs to the phase de tector will be 10 MHz when the loop is locked.

-7

/day, and we wish to transfer that

MG369XA MM 2-9

Page 34

Frequency Synthesis Functional Description

Overall Operation

If a programmable frequency divider is used, a num ber of frequencies can be phase-locked to the same reference. The limitation is that all must be exact multiples of the reference. The A4 coarse loop and A3 fine loop section both use programmable fre quency dividers.

The YIG-tuned oscillator generates a high-power RF output signal that has low broadband noise and low spurious content. The frequency of the YIG-tuned os cillator is controlled by means of (1) its main tuning coil and (2) its FM (fine tuning) coil. The main tun ing coil current from the YIG-driver PCB coarsely tunes the YIG-tuned oscillator to within a few mega hertz of the final output frequency. The YIG phase-lock loop is then used to fine tune the YIG-tuned oscillator to the exact output frequency and to reduce FM noise close to the carrier.

One input to the YIG loop is the 219.5 to 245 MHz signal from the coarse loop. This signal is amplified to drive the step-recovery diode (located on the A7 PCB). The step-recovery diode produces harmonics of the coarse loop signal (³1.9755 to >20 GHz).These harmonics are used by the sampler.

The other input to the sampler is a sampled RF output signal from the YIG-tuned oscillator. Mixing this RF output signal sample with the adjacent coarse-loop harmonic produces a low frequency dif ference signal that is the 21.5 to 40 MHz YIG IF sig nal.

The MG369XA CPU programs the coarse-loop oscil lator's output frequency so that one of its harmonics will be within 21.5 to 40 MHz of the desired YIG-tuned oscillator's output frequency. The YIG loop phase detector compares the YIG IF signal to the 21.5 to 40 MHz reference signal from the fine loop. If there is a difference, the YIG phase detector fine tunes the YIG-tuned oscillator (via the FM cir cuitry and the FM coil drivers) to eliminate any fre quency difference between the two signals.

2-10 MG369XA MM

Page 35

Functional Description Overall Block Diagram

A3 Reference / Fine Loop

10 MHz Output

Phase Frequency Detector

SRD

10 MHz VCXO or Option 16

Mixer

DDS

Loop AMP

Filter

100 MHz

VCXO

LPF

10 MHz to A13 (Option 24)

10 MHz to A8 (Option 23)

100 MHz to

A4 (Option 3)

10 MHz

0.01 - 10 MHz DDS Output

Loop AMP

26.84 MHz to A8 DDS PCB* (Option 22)

* This section is only found in vintage models.

Fine Tune Coil Driver

CW Filter

(From A5)

+ 15V

Figure 2-2.

Block Diagram of the Frequency Synthesis Sub

system

MG369XA MM 2-11

Page 36

Overall Block Diagram Functional Description

External AM

Internal AM

ALC Slope

From

CPU

D0 - D15

L_SEL3

A01 - A03

EPLD

AM Input

Sensitivity DAC

Slope DAC

Switch Control Circuits

P/O A6 PCB

Calibration

DAC

Level

REF DAC

Switched Filter

PIN Drivers

Level Amp

P/O RF Deck

2-20GHz

YIG

Oscillator

16.8 GHz LPF and 6 dB Pad

Switched

Filter

ALC

Control

10 - 16.8 GHz

0.01 - 20 GHz

0.01 - 2 GHz

Down Converter

Detector 0

Level Control

Limiter/Shaper

ALC Driver

Source Quadrupler Module

40 65 GHz

Switched

Doubler

Module

37 GHz HPF

Forward Coupler

0.01 - 40 GHz

0.01 - 65 GHz

Level

Detector

Detector 1

To A6 PCB

To Step

Attenuator

RF Output

External ALC

(From Rear Panel)

Detector 1 Detector 0

Serial Data

(From A2 PCB)

10 MHz

(From A3 PCB)

Serial Data

(From Rear Panel)

Detector

MUX

Serial/Parallel

Converter

Log

Amp

Pulse

Generator

P/O A13 PCB

Sample/Hold

*Sample/Hold

Control

Switch

Control

External Pulse

(From Rear Panel)

Figure 2-3.

DDC

ALC

Driver

Block Diagram of the ALC Subsystem

0.01 - 2.2 GHz Digital Down Converter (Option 4)

Detector 0

Band Switch Control From A5 AUX PCB

2-12 MG369XA MM

Page 37

Functional Description Frequency Synthesis

Phase locking the instrument's output frequency over a broad frequency range is accomplished by programming the coarse-loop oscillator's output to various frequencies that have harmonics close to the

Table 2-1. RF Output and Loop Frequencies

RF OUTPUT/LOOP FREQUENCIES

(in MHz)

COARSE LOOP

RF OUT

2000 219.5 (218.1) 24.5 (37.5) 3000 229 (217.1) 23 (40) 4000 234 (212.6) 22 (40) 5000 237 (420) 23 (40) 6000 239 (464.6) 25 (40) 7000 240.5 (469.3) 25.5 (40) 8000 241.5 (472.9) 30.5 (40)

9000 242.5 (821.8) 27.5 (40) 10000 243 (836.7) 37 (40) 11000 238.5 (849.2) 29 (40) 12000 239.5 (926.2) 25 (40) 13000 240 (869.33) 40 (40)

STD (opt 3)

FINE LOOP

STD (opt 3)

desired operating frequencies. Exact frequency tun ing for each desired operating frequency is accom plished by programming the fine-loop oscillator. In each case, the YIG-tuned oscillator is first tuned via the main tuning coil to the approximate desired op erating frequency.Table 2-1 shows the coarse-loop and fine-loop frequencies for specific RF output fre quencies.

The coarse-loop oscillator has a programming (tun ing) range of 219.5 to 245 MHz and a resolution of 1 MHz. This provides harmonics from ³1.9755 GHz to >20 GHz. This allows any YIG-tuned oscillator output frequency to be down converted to a YIG IF signal of 21.5 to 40 MHz.

The YIG loop is fine tuned by varying the 21.5 to 40 MHz reference signal applied to the YIG loop phase detector. By programming the fine-loop oscillator, this signal can be adjusted in 0.01 Hz increments over the 21.5 to 40 GHz range. The resolution of the fine-loop oscillator (hence the resolution of the RF output signal) is 0.01 Hz, which is much finer than is available from the coarse loop alone.

The coarse loop and fine loop outputs are derived from high-stability 10 MHz and 500 MHz signals generated by the A3 reference loop.For applications requiring even greater stability, the 100 MHz oscil lator can be phase locked to an optional 10 MHz high stability reference (internal or external).

14000 245 (877.5) 35 (40) 15000 241.5 (940) 27 (40) 16000 242 (943.5) 28 (40) 17000 242.5 (946.7) 25 (40) 18000 239.5 (859.1) 37.5 (40) 19000 240 (865.5) 40 (40) 20000 243.5 (871.3) 33 (40)

MG369XA MM 2-13

Page 38

Frequency Synthesis Functional Description

Table 2-2. Digital Down Converter

Frequency Bands

Frequency Range

Band

0 10 - 12.5 1 12.5 - 17.5 2 17.5 - 22.5 3 22.5 - 31.25 4 31.25 - 43.75 5 43.75 - 62.5 6 62.5 - 87.5 7 87.5- 125 8 125 - 175

9 175 - 250 10 250 - 350 11 350 - 500 12 500 - 700 13 700 - 1050 14 1050 - 1500 15 1500 - 2200

(in MHz)

RF Outputs

0.01 MHz to 65 GHz

Refer to the block diagram of the RF Deck shown in Figure 2-4 (page 2-27) for the following description. The MG369XA uses one YIG-tuned oscillator capa

ble of generating RF signals in the frequency range of 2.0 to 20 GHz (the MG3691A YIG-tuned oscillator generates RF signals in the frequency range of 2.0 GHz to 8.4 GHz). All other frequencies output by the instrument, except for 0.1Hz – 10 MHz (Option 22) are derived from the fundamental frequencies gener ated by the YIG-tuned oscillator.

0.01 to 2.2 GHz (Option 4)

RF output frequencies of 0.01 to 2.2 GHz are devel oped by down converting the fundamental frequen

cies of 2 to 4.4 GHz.This is achieved by using a series of dividers and 16 bandpass filters. Precise control of the 0.01 to 2.2 GHz frequencies to 0.01 Hz resolution is achieved through phase-lock control of the fundamental frequencies prior to division.

0.01 to 2 GHz (Option 5)

RF output frequencies of 0.01 to 2 GHz are developed by down converting the fundamental frequencies of 6.51 to 8.5 GHz.This is achieved by mixing the fundamental RF output with a 6.5 GHz local oscillator signal that is phase locked to the 500 MHz output of the reference loop. Precise control of the

0.01 to 2 GHz frequencies to 0.01 Hz resolution is accomplished by phase-lock control of the 6.51 to

8.5 GHz fundamental frequencies prior to down con version.

20 to 30 GHz (Model MG3693A)

RF output frequencies of 20 to 30 GHz are produced by doubling the 10 to 15 GHz fundamental frequen cies. Phase-lock control of the 10 to 15 GHz funda

mental frequencies, accomplished prior to doubling, ensures precise control of the 20 to 30 GHz frequen cies to 0.01 Hz resolution.

20 to 40 GHz (Model MG3694A)

RF output frequencies of 20 to 40 GHz are produced by doubling the 10 to 20 GHz fundamental frequen cies. Phase-lock control of the 10 to 20 GHz funda

mental frequencies, accomplished prior to doubling, ensures precise control of the 20 to 40 GHz frequen cies to 0.01 Hz resolution.

2-14 MG369XA MM

Page 39

Functional Description Frequency Synthesis

40 to 50 GHz (Model MG3695A)

RF output frequencies of 40 to 50 GHz are produced by quadrupling the 10 to 12.5 GHz fundamental fre quencies. Phase-lock control of the 10 to 12.5 GHz fundamental frequencies is accomplished prior to doubling. This ensures precise control of the 40 to 50 GHz frequencies to a 0.01 Hz resolution.

40 to 65 GHz (Model MG3696A)

RF output frequencies of 40 to 65 GHz are produced by quadrupling the 10 to 16.25 GHz fundamental frequencies. Phase-lock control of the 10 to

16.25 GHz fundamental frequencies is accomplished prior to doubling. This ensures precise control of the 40 to 50 GHz frequencies to a 0.01 Hz resolution.

0.1 Hz to 10 MHz (Option 22)

Output frequencies of 0.1 Hz to 10 MHz are pro duced by models with Option 22.The 0.1 Hz to 10 MHz signal is generated by a direct digital synthesizer (DDS) located on the A8 PCB (installed by Option 22). Precise control of the output frequencies to a 0.1 Hz resolution is achieved by phase-lock control of the 26.8435456 MHz signal generated by the fine loop circuitry on the A3 PCB.

Frequency Modulation

Phase Modulation

Frequency modulation (FM) of the YIG-tuned oscillator RF output is achieved by summing an external or internal modulating signal into the FM control path of the YIG loop (refer to Figures 2-1 and 2-2).

The external modulating signal comes from the rear panel FM/FM IN input connector; the internal mod ulating signal comes from the A8 Function Genera tor PCB. Circuits on the A7A1 FM Module adjust the modulating signal for the FM sensitivity selected, then sum it into the YIG loop FM control path. There, it frequency modulates the RF output signal by controlling the YIG-tuned oscillator’s FM (fine tuning) coil current.

Phase modulation (FM) of the YIG-tuned oscillator RF output is achieved by summing an external or in ternal modulating signal into the FM control path of the YIG loop. The external modulating signal comes from the rear panel FM IN/FM IN input connector; the internal modulating signal comes from the A8 Function Generator PCB.

MG369XA MM 2-15

Page 40

Frequency Synthesis Functional Description

Analog Sweep Mode

NOTE

For units with Option 21B at frequencies of £2.2 GHz, broad-band analog frequency sweeps are >25 MHz wide; narrow-band analog frequency sweeps are £25 MHz.

Circuits on the A7A1 FM Module adjust the modu lating signal for the FM sensitivity selected, convert the modulating signal to a FM signal by differentia tion, and then sum it into the YIG loop FM control path. There, it phase modulates the RF output sig nal by controlling the YIG-tuned oscillator’s FM (fine tuning) coil current.

Broad-band analog frequency sweeps (>100 MHz wide) of the YIG-tuned oscillator RF output are ac complished by applying appropriate analog sweep ramp signals, generated by the A5 Analog Instruc tion PCB, to the YIG-tuned oscillator’s main tuning coil. In this mode,the start,stop, and bandswitching frequencies are phase-lock-corrected during the sweep.

Narrow-band analog frequency sweeps (£100 MHz wide) of the YIG-tuned oscillator RF output are accomplished by summing appropriate analog sweep ramp signals, generated by the A5 Analog Instruction PCB, into the YIG-tuned oscillator’s FM tuning coil control path. The YIG-tuned oscillator’s RF output is then swept about a center frequency. The center frequency is set by applying a tuning signal (also from the A5 PCB) to the YIG-tuned oscillator’s main tuning coil. In this mode, YIG loop phase locking is disabled except during center frequency correction, which occurs during sweep retrace.

Step Sweep Mode

Step (digital) frequency sweeps of the YIG-tuned os cillator RF output consist of a series of discrete, syn thesized steps between a start and stop frequency. Each frequency step is generated by applying the tuning signal (from the A9 module PCB) to the YIG-tuned oscillator's main tuning coil, then phase-locking the RF output. Every frequency step in the sweep range is phase-locked.

2-16 MG369XA MM

Page 41

Functional Description ALC/AM/Pulse Modulation

2-4 ALC/AM/Pulse

Modulation

The MG369XA ALC, AM, and pulse modulation subsystems provide automatic level control (ALC), amplitude modulation (AM), and pulse modulation of the RF output signal.The ALC loop consists of circuits located on the A6 ALC PCB, and the A9 YIG PCB assembly.These cir cuits interface with the A10 switched filter assembly, the A11 down converter assembly and the directional coupler/level detector (all lo cated on the RF deck). AM circuits located on the A6 ALC PCB and A6A1 AM Module are also included in this loop. Pulse modulation of the RF output signal is provided by circuits on the A6 ALC PCB. These circuits interface directly with the switched filter assembly located on the RF deck via coaxial cables. (In units with Option 4, these circuits interface directly with the digital down converter and are looped through the digital down converter to the switched filter assembly.)

The ALC subsystem is shown in Figure 2-3, page 2-12. The following paragraphs describe the operation of the subsystem components.

ALC Loop Operation

In the MG369XA , a portion of the RF output is detected and coupled out of the directional coupler/level detector as the feedback input to the ALC loop. The feedback signal from the detector is routed to the A6 ALC PCB where it is compared with a reference voltage that represents the desired RF power output level. If the two voltages do not match, an error correction signal is fed to the modulator shaper amplifier circuits located on the A6 PCB. The resulting ALC control voltage output causes the level control circuits, located on the A10 switched filter assembly,to adjust the RF output level.Thus, the feedback signal voltage from the level detector will be set equal to the reference voltage.

NOTE

The instrument uses two internal level de tection circuits. For frequencies <2 GHz, the level detector is part of the down con verter. The signal from this detector is routedto theA6ALC PCB astheDetector 0 input.Forfrequencies³2GHz,the level de tector is part of the main directional cou pler.The signal from this detector is routed tothe A6ALC PCBasthe Detector1input.

The level reference DAC, under the control of the CPU, provides the RF level reference voltage. By set ting the output of this DAC to the appropriate volt age, the CPU adjusts the RF output power to the level selected by the user.

MG369XA MM 2-17

Page 42

ALC/AM/Pulse Modulation Functional Description

External Leveling

In the external leveling mode, an external detector or power meter monitors the RF output level of the MG369XA instead of an internal level detector.The signal from the external detector or power meter goes to the A6 ALC PCB assembly from the rear panel input. The ALC controls the RF power output level as previously described.

ALC Slope

During analog sweeps, a slope-vs-frequency signal, from the A5 Analog Instruction PCB, is summed with the level reference and detector inputs into the ALC loop. The Slope DAC, under the control of the CPU, adjusts this ALC slope signal to compensate for an increasing or decreasing output power-vs-fre quency characteristic caused by the level detectors and (optional) step attenuator.In addition, the Slope DAC lets the user adjust for the slope-vs-frequency characteristics of external components.

Power Sweep

In this mode, the CPU has the ALC step the RF output through a range of levels specified by the user. This feature can be used in conjunction with the sweep mode to produce a set of identical frequency sweeps, each with a different RF power output level.

Amplitude Modulation

Amplitude modulation (AM) of the RF output signal is accomplished by summing an external or internal modulating signal into the ALC loop.External mod ulating signals come from the rear panel AM IN in puts; the internal modulating signal comes from the A8 Function Generator PCB.

The AM Input Sensitivity DAC and the AM Calibra tion DAC, under the control of the CPU,adjust the modulating signal for the proper amount of AM in both the linear and the log modes of operation.The adjusted modulating signal is summed with the level reference, slope, and detector inputs into the ALC loop. This produces an ALC control signal that varies with the modulating signal. The action of the ALC loop then causes the envelope of the RF output signal to track the modulation signal.

2-18 MG369XA MM

Page 43

Functional Description ALC/AM/Pulse Modulation

Pulse Modulation Operation

During pulse modulation, the ALC level amplifier (A6 ALC PCB) is operated as a sample/hold amplifier. The level amplifier is synchronized with the modulating pulses from the A13 Pulse Genera tor PCB so that the ALC loop effectively operates only during the ON portion of the pulsed modulated RF output.

Pulse Generator Operation

The A13 Pulse Generator PCB provides the internal pulse generating function for the MG369XA.It also interfaces external pulse inputs from the rear panel connector to the pulse modulator driver in the exter nal mode.

The pulse generator produces a pulse modulation waveform consisting of single, doublet, triplet, or quadruplet pulse trains at variable pulse rates, widths, and delays. It operates at two selectable clock rates—10 MHz and 40 MHz.In addition,the pulse generator produces a sync pulse and video pulse output that goes to the rear panel and a sample/hold signal that goes to the A6 ALC PCB. The sync pulse output is for synchronizing auxiliary instruments to the internally generated pulse;the video pulse is a TTL level copy of the RF output pulse; and the sample/hold signal synchronizes the ALC loop to the ON portion of the pulse modulating waveform.

The MG369XA has five pulse modulation modes:

Internal pulse modulation mode—The pulse modulation waveform is generated and timed internally (Option 24 or 25X only).

External pulse mode—The external pulse source signal from the front or rear panel con nectors is interfaced by the pulse generator to the pulse modulation driver.

External triggered mode—The pulse generator is triggered by the external pulse source signal to produce the pulse modulation waveform.

External gated mode—The external pulse source signal gates the internal pulse genera tor on and off.

Composite mode—The external pulse source signal triggers the internal pulse generator and also modulates the RF output signal. The pulse generator produces a delayed, single pulse waveform that also modulates the RF output signal (Option 24 or 25X only).

MG369XA MM 2-19

Page 44

RF Deck Assemblies Functional Description

2-5 RF Deck Assemblies The primary purpose of the RF deck assembly is to generate CW RF

signals and route these signals to the front panel RF OUTPUT connec tor. It is capable of generating RF signals in the frequency range of

0.01 to 65 GHz (0.1Hz to 65 GHz with Option 22).

The series MG369XA use a single YIG-tuned oscillator.All other fre quencies (except for 0.1Hz to 10 MHz), are derived from the funda mental frequencies generated by this oscillator, as follows:

RF output frequencies of 0.01 to 2 GHz are developed by down

converting the fundamental frequencies of 6.51 to 8.5 GHz RF output frequencies of 20 to 30 GHz are produced by doubling

the fundamental frequencies of 10 to 15 GHz RF output frequencies of 20 to 40 GHz are produced by doubling

the fundamental frequencies of 10 to 20 GHz RF output frequencies of 40 to 50 GHz are produced by quadru

pling the fundamental frequencies of 10 to 12.5 GHz RF output frequencies of 40 to 65 GHz are produced by quadru-

pling the fundamental frequencies of 10 to 16.25 GHz Output frequencies of 0.1 Hz to 10 MHz (installed by Option 22)

are generated by the A8 10 MHz DDS PCB (for the CW Generators), or are generated by an updated A3 Reference Loop PCB (for the Signal Generators)

RF Deck Configurations

All MG369XA RF deck assemblies contain a YIG-tuned oscillator, a switched filter assembly, and a directional coupler. Beyond that,the configuration of the RF deck assembly varies according to the par ticular instrument model and options installed.

Refer to the block diagram in Figure 2-4, which shows the various RF deck configurations and in cludes all of the common RF components found in the series MG369XA RF deck assemblies. Refer to this block diagram while reading the following para graphs.

2-20 MG369XA MM

Page 45

Functional Description RF Deck Assemblies

YIG-tuned Oscillator

There are two YIG-tuned oscillator configurations. The MG3691A uses a single-band, 2 to 8.4 GHz, YIG-tuned oscillator. All other MG369XA models use a dual-band, 2 to 20 GHz YIG-tuned oscillator. The dual-band YIG-tuned oscillator contains two oscilla tors—one covering the frequency range of 2 to

8.4 GHz and one covering the frequency range of 8.4 to 20 GHz. Both of these oscillators use a common internal amplifier.

The YIG-tuned oscillator generates RF output sig nals that have low broadband noise and low spuri ous content. It is driven by the main tuning coil current and bias voltages from the A9 YIG PCB as sembly and the fine tuning coil current from the A7 YIG lock PCB. During CW mode, the main tuning coil current tunes the oscillator to within a few megahertz of the final output frequency. The phase-lock circuitry of the YIG loop then fine adjusts the oscillator's fine tuning coil current to make the output frequency exact.

MG369XA MM 2-21

Page 46

RF Deck Assemblies Functional Description

RF Signal Filtering

The RF signal from the YIG-tuned oscillator is routed to the level control circuits located on the A10 switched filter assembly and then, via PIN switches, to switched low-pass filters. The PIN switch drive current signals are generated on the A6 ALC PCB and routed to the switch control input on the A10 as sembly.

The switched low-pass filters provide rejection of the harmonics that are generated by the YIG-tuned os cillator. In MG369XA models, the 2 to 20 GHz RF signal from the level control circuits has four filter ing paths and a through path.The four filtering paths are 3.3 GHz, 5.5 GHz, 8.4 GHz, and 13.5 GHz. Signals above 13.5 GHz are routed via the through path.

To generate RF signals from 0.01 to 2 GHz, the MG369XA couples the RF signal to the A11 down converter. A coupler in the A10 switched filter path provides this RF signal , which is routed through a

8.5 GHz low-pass filter to connector J3, and then to the down converter. The 0.01 to 2 GHz RF signal output from the down converter is routed back to the A10 assembly (connector J1) and then multiplexed through the same path to the switched filter output.

After routing through the appropriate path,the RF signal is multiplexed by the PIN switches and goes via a 20 GHz low-pass filter to the A10 switched fil ter assembly output connector J2. From J2, the RF signal goes to either the input of the directional cou pler (model MG3692A) or input connector J1 of the A11 switched doubler module (models MG3693A/4A).

For models with Option 22,the RF signal from J2 goes to either input connector A of the diplexers (£20 GHz models) or the input connector J1 of the switched doubler module (>20 GHz models).

2-22 MG369XA MM

Page 47

Functional Description RF Deck Assemblies

NOTE

For models with Option 22 and withoutOption 2F,the0.01to 2 GHz (0.01 to 2.2 GHz with Option 4) RF output of the down converter is diplexed with the 0.1Hz to 10 MHz output of the A8 10 MHz DDS PCB. The resulting 0.1Hz to 2 GHz signal is then diplexed with the RF signal from the switched filter assembly (or switched doubler module for >20GHz models) intotheRF path to the directional coupler.

0.01 to 2 GHz Down Converter (Option 5)

The 0.01 to 2 GHz down converter assembly (shown in Figure 2-4) contains a 6.5 GHz VCO that is phase-locked to the 500 MHz reference signal from the A3 reference loop PCB. The 6.5 GHz VCO's phase-lock condition is monitored by the CPU. The

6.5 GHz VCO is on at all times; however, the down converter amplifier is powered on by the A5 AUX PCB only when the 0.01 to 2 GHz frequency range is selected.

During CW or step frequency operations in the

0.01 to 2 GHz frequency range,the 6.51 to 8.5 GHz RF signal output from J3 of the switched filter as sembly goes to input connector J1 of the down con verter. This signal is then mixed with the 6.5 GHz VCO signal resulting in a 0.01 to 2 GHz RF signal. The resultant RF signal is fed througha2GHz low-pass filter, then amplified and routed to the out put connector J3. A portion of the down converter's RF output signal is detected, amplified, and coupled out for use in internal leveling. This detected RF sample is routed to the A6 ALC PCB.

The 0.01 to 2 GHz RF output from the down converter goes to input connector J1 of the switched filter assembly.There, the 0.01 to 2 GHz RF signal is multiplexed into the switched filter’s output.

0.01 to 2.2 GHz Digital Down Converter (Option 4)

The 0.01 to 2.2 GHz digital down converter assembly maintains the same basic functionality and control as the 0.01 to 2 GHz down converter.During CW or step frequency operations in the 0.01 to 2.2 GHz fre quency range, a 2 to 4.4 GHz RF signal output from J3 of the switched filter assembly goes to the input connector J1 of the down converter.

This signal is then down converted through a series of dividers resulting in a 0.01 to 2.2 GHz RF signal output. The resultant RF signal is fed through a se ries of band-pass filters, then detected, amplified, and coupled out for use in internal leveling before being routed to the output connector J3. The de tected RF sample is routed to the A6 ALC PCB. Digi tal control signals from the A2 CPU PCB are routed through the A5 auxiliary PCB.

MG369XA MM 2-23

Page 48

RF Deck Assemblies Functional Description

Switched Doubler Module

The A11 switched doubler module is used on all MG369XA models with RF output frequencies >20 GHz. Model MG3693A uses a SDM to double the fundamental frequencies of 10 to 15 GHz to produce RF output frequencies of 20 to 30 GHz. Similarly, model MG3694A uses a SDM to double the funda mental frequencies of 10 to 20 GHz to produce RF output frequencies of 20 to 40 GHz.

The RF signal from the switched filter assembly is input to the SDM at J1.During CW or step fre quency operations in the 20 to 40 GHz frequency range, the 10 to 20 GHz RF signal input is routed by PIN switches to the doubler/amplifiers. PIN switch drive current is provided by the A6 ALC PCB and bias voltage is provided for the doubler/amplifiers by the A5 AUX PCB assembly. The RF signal is ampli fied, then doubled in frequency. From the doubler, the 20 to 40 GHz RF signal is routed by PIN switches to the bandpass filters. The A11 SDM has three bandpass filter paths that provide good harmonic performance. The filter frequency ranges are 20 to 25 GHz, 25 to 32 GHz,and 32 to 40 GHz.

After routing through the appropriate bandpass filter, the 20 to 40 GHz RF signal is multiplexed by the PIN switches to the SDM output at connector J2. RF signals input to the SDM of £20 GHz are multiplexed through by the PIN switches of the SDM to the output connector J2. From J2, The RF signal goes to the directional coupler.

For models with Option 22,the RF signal from J2 goes to input connector A of the diplexers. It is diplexed with the 0.01 to 2 GHz RF signal from the down converter and the 0.1 Hz to 10 MHz signal from the A8 10 MHz DDS PCB (for the CW Genera tors), or the A3 Reference Loop PCB (for the Signal Generators), into the RF path to the directional cou pler.

2-24 MG369XA MM

Page 49

Functional Description RF Deck Assemblies

Source Quadrupler Module

The source quadrupler module, found in >40 GHz models, is used to quadruple the fundamental fre quencies of 10 to 16.25 GHz to produce RF output frequencies of 40 to 65 GHz.The RF signal inputs for the SQM come from the switched filter assembly. The modulator control signal for the SQM is re ceived from the A6 ALC PCB where it is developed from the ALC control signal. The A6 PCB also sup plies the amplifier bias voltage(s) for the SQM.

Model MG3695A (SQM P/N: ND60341)

During CW and swept frequency operations in the 40 to 50 GHz frequency range,the 10 to 12.5 GHz RF signal input is quadrupled and amplified, then goes to the modulator.The modulator provides for power level control. From the modulator, the 40 to 50 GHz RF signals goes via a band-pass filter to out put connector J3 of the forward coupler. Note that on the 40 to 50 GHz SQM (P/N: ND60341), the forward coupler is an integral part of the SQM. The

0.01 to 40 GHz RF output signals from the SDM (0.1 Hz to 40 GHz RF output signals from the diplexers for MG3695A with Option 22) are routed to input connector J2 of the SQM forward coupler.The

0.01 to 50 GHz (0.1 Hz to 50 GHz for MG3695A with Option 22) RF output signals go from J3 of the SQM forward coupler to the directional coupler.

Model MG3696A (SQM P/N: ND60342)

During CW or swept frequency operations in the 40 to 65 GHz frequency range, the 10 to 16.25 GHz RF signal input is qaudrupled and amplified,then goes to the modulator. The modulator provides for power level control of the RF output signals. From the modulator, the 40 to 65 GHz RF signals go via a band-pass filter to the output connector of the SQM. From the SQM, the 40 to 65 GHz RF output signals go through a 37 GHz high pass filter and then to the input connector J1 of the forward coupler, P/N: C27184. From the SDM, the 0.01 to 40 GHz RF output signals (0.1 Hz to 40 GHz RF output signals from the diplexers for MG3696A with Option 22) are routed to input connector J2 of the forward coupler. The 0.01 to 65 GHz (0.1 Hz to 65 GHz for MG3696A with Option 22) RF output signals go from the out put connector J3 of the forward coupler to the direc tional coupler.

MG369XA MM 2-25

Page 50

RF Deck Assemblies Functional Description

Step Attenuators

The optional step attenuators available for use with the MG369XA models are as follows:

Mechanical step attenuator £20 GHz, with a

110 dB range, for model MG3692A (Option 2A) Mechanical step attenuator £40 GHz, with a

110 dB range, for models MG3693A and MG3694A (Option 2B) Mechanical step attenuator ³40 GHz, with a

90 dB range, for models MG3695A and MG3696A (Option 2C) Electronic step attenuator £8.4 GHz, with a

120 dB range, for model MG3691A (Option 2E) Electronic step attenuator £20 GHz, with a

120 dB range, for model MG3692A (Op

tion 2F*)

Step attenuators provide attenuation of the RF output in 10 dB steps. Maximum rated RF output power is reduced. The step attenuator drive current for Option 2 is supplied by the A6 PCB.

* Option 2F was limited and discontinued as of October 31, 2002. The following model serial numbers are the only models that were installed with Option 2F:

Model Serial Number

MG3690A/2F 011008 MG3690A/2F 011011 MG3690A/2F 011115 MG3690A/2F 011115 MG3690A/2F 011123 MG3690A/2F 020311 MG3690A/2F 020606 MG3690A/2F 021004 MG3690A/2F 021005 MG3690A/2F 022409 MG3690A/2F 022603 MG3690A/2F 023001 MG3690A/2F 023103 MG3690A/2F 023305 MG3690A/2F 023308 MG3690A/2F 023309 MG3690A/2F 024001

2-26 MG369XA MM

Page 51

RF Deck Circuits Overall Block Diagram

20 - 40 GHz

>+8.5 dBm

A12 Switched Doubler Module - D28540

(Models MG3693A/4A only)

20-25GHzBPF

Bias

25 - 32 GHz BPF

32-40GHzBPF

Switch

Control

RF Path with Option 22

Loss A - C <2 dB Loss B - C <2 dB

0.1Hz-2GHz

Diplexer

29850

Control

Directional

Coupler

Level

Detect

Loss A - C <1.5 dB Loss B - C <1.5 dB

Step

Attenuator

(Option)

Control

RF Output

0.01 - 40 GHz

(0.1 Hz - 40 GHz

with Option 22)

BIAS

MAIN

2-20 GHz

YIG Oscillator

P/O A9

8.4-20 GHz

2-8.4 GHz

>+4dBm

A10 Switched Filter Assy. - D45194 (Std)

- D45198 (Opt 15A)

3.3 GHz LPF

Sampler

(-7 to -14 dBm

typical)

8.5 GHz LPF

>+17 dBm

Level

Control

5.5 GHz LPF

8.4 GHz LPF

13.5 GHz LPF

Switch

Control

A11 Down Converter Assy.

D27330 (Option 5)

>+15 dBm (Std.)

20 GHz LPF

>+20 dBm (Opt. 15A)

2.0 - 4.4 GHz

Switch Control

Level Control

Pulse Control

Digital Down Converter Assembly

ND55519 (Option 4)

6.51 - 8.5 GHz

500 MHz

1500 - 2200 MHz 1050 - 1500 MHz 700 - 1050 MHz 500 - 700 MHz 350 - 500 MHz 250 - 350 MHz 175 - 250 MHz 125 - 175 MHz

87.5 - 125 MHz

62.5 - 87.5 MHz

43.75 - 62.5 MHz

31.25 - 43.75 MHz

22.5 - 31.25 MHz

17.5 - 22.5 MHz

12.5 - 17.5 MHz 10 - 12.5 MHz

6.5 GHz

LPF

Detected

0.01 - 2GHz

0.01 - 2 GHz

>+16 dBm

RF Output

0.01 - 2.2 GHz >+17dBm

RF Path with Option 22

Diplexer

46504

Control

0.1 Hz - 10 MHz

>+15 dBm

DDS

(Option 22)

NOTES

If the Electronic Step Attenuator(Option 2F) is installed, the 0.01 to 10 MHz signal (Option 22) is inserted into the Step Attenuator. Diplexers (P/Ns 29860 and 46504) are not required.

If the Digital Down Converter (Option 4) is installed, the 500 MHz reference is not used by the DDC. TheDDC RF inputis 2.0to 4.4GHzfor anRFoutputof0.01 to2.2GHz.

Figure 2-4. Block Diagram of the RF Deck Assembly for Models

MG3693A and MG3694A

MG369XA MM 2-27

Page 52

Overall Block Diagram RF Deck Circuits

B I A S

M A I N

B P F

S w i t c h



J 2

L o s s A - C < 2 d B L o s s B - C < 2 d B

A 8

D D S

( O p t i o n 2 2 )

3 7 G H z H P F

0 . 0 1 - 4 0 G H z

> + 1 0 d B m

R F P a t h w i t h O p t i o n 2 2

0 . 0 1 - 1 0 M H z

> + 1 5 d B m

( J 1 )

F o r w a r d C o u p l e r

D i p l e x e r

2 9 8 5 0

D i p l e x e r

J 2

C o n t r o l

0 . 0 1 H z - 2 G H z

4 6 5 0 4

C o n t r o l

J 3

D i r e c t i o n a l

C o u p l e r

C o n t r o l

S o u r c e Q u a d r u p l e r M o d u l e



9 0 d B

S t e p

A t t e n u a t o r

( O p t i o n )

C o n t r o lL e v e l

R F O u t p u t

0 . 0 1 - 6 5 G H z

( 0 . 0 1 H z - 6 5 G H z w i t h O p t i o n 2 2 )

P a r t N u m b e r s : N D 6 0 3 4 1 ( 4 0 t o 5 0 G H z ) N D 6 0 3 4 2 ( 4 0 t o 6 5 G H z )

S Q M P / N : N D 6 0 3 4 1 c o n t a i n s a F o r w a r d C o u p l e r . F o r w a r d C o u p l e r P / N : C 2 7 1 8 4 i s u s e d w i t h S Q M P / N : N D 6 0 3 4 2 .

T h e 1 6 . 8 G H z L P F a n d 6 d B P A D ,

P / N : B 2 8 6 1 2 , i s u s e d w i t h S Q M P / N : N D 6 0 3 4 2 .

T h e 3 7 G H z H P F , P / N : 4 9 2 4 7 , i s u s e d w i t h S Q M P / N : N D 6 0 3 4 2 .

S o u r c e Q u a d r u p l e r M o d u l e

J 1

L e v e l

C o n t r o l

> + 2 0 d B m

2 0 G H z L P F

0 . 0 1 - 2 G H z

J 3

> + 1 6 d B m

J 1

x 4

B i a s

M o d u l a t o r

C o n t r o l

S w i t c h e d D o u b l e r M o d u l e - D 2 8 5 4 0

2 0 - 2 5 G H z B P F

J 2

J 1

x 2

R F P a t h w i t h O p t i o n 2 2

2 5 - 3 2 G H z B P F

3 2 - 4 0 G H z B P F

B i a s

C o n t r o l

1 6 . 8 G H z L P F

& 6 d B P A D

J 4

2 - 2 0 G H z

S w i t c h e d F i l t e r A s s e m b l y - D 4 5 1 9 8

Y I G O s c i l l a t o r

3 . 3 G H z L P F

8 . 4 - 2 0 G H z

F M

2 - 8 . 4 G H z

> + 4 d B m

J 6

J 5

M o d u l a t o r

S a m p l e r

( - 7 t o - 1 4 d B m t y p i c a l )

C o n t r o l

8 . 5 G H z L P F

J 3

> + 1 7 d B m

5 . 5 G H z L P F

8 . 4 G H z L P F

1 3 . 5 G H z L P F

S w i t c h

C o n t r o l

D o w n C o n v e r t e r A s s y .

D 2 7 3 3 0

6 . 5 1 - 8 . 5 G H z

5 0 0 M H z

J 1

J 2

L P F

6 . 5 G H z

Figure 2-5. Block Diagram of the RF Deck Assembly for Models MG3695A and MG3696A

2-28 MG369XA MM

Page 53

Table of Contents

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

Chapter 3 Performance Verification

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

Page 54

Table of Contents (Continued)

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

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

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

3-2 MG369XA MM

Page 55

Chapter 3 Performance Verification

3-1 Introduction This chapter contains tests that can be used to verify the performance

of the series MG369XA Synthesized Signal Generators to specifica tions. These tests support all instrument models having any version of firmware and instrument models with the following options:

Option 2X, MG369XA (mechanical step attenuator)

Option 2E, MG3691A (electronic step attenuator)

Option 3 (ultra low phase noise)

Option 4 (digital down converter)

Option 5 (analog down converter)

Option 6 (analog sweep)

Option 12 (external frequency and phase modulation)

Option 13X (external pulse modulation)

Option 15X (high power output)

Option 16 (high stability time base)

Option 22 (low frequency audio DDS)

Option 23 (internal low frequency generator)

Option 24 (internal pulse generator)

Option 25X (modulation suite)

3-2 Test Records A blank copy of a sample performance verification test record for each

MG369XA model is provided in Appendix A. Each test record contains the model-specific variables called for by the test procedures. It also provides a means for maintaining an accurate and complete record of instrument performance. We recommend that you copy these pages and use them to record the results of your initial testing of the instru ment. These initial test results can later be used as benchmark values for future tests of the same instrument.

MG369XA MM 3-3

Page 56

Connector and Key Notation Performance Verification

3-3 Connector and Key

Notation

3-4 Recommended Test

Equipment

3-5 Measurement

Uncertainty

The test procedures include many references to equipment intercon nections and control settings. For all MG369XA references, specific la bels are used to denote the appropriate menu key, data entry key, data entry control, or connector (such as RF Output).Most references to sup porting test equipment use general labels for commonly used controls and connections (such as Span or RF Input). In some cases, a specific label is used that is a particular feature of the test equipment listed in Table 3-1 on page 3-5.

Table 3-1 provides a list of the recommended test equipment for the performance verification tests. The test procedures refer to specific front panel control settings when the test equipment setup is critical to making an accurate measurement. In some cases, you may substi tute test equipment having the same critical specifications as the test equipment indicated in the recommended test equipment list. Contact your local Anritsu service center if you need clarification of any equip ment or procedural reference.

The test records found in Appendix A specify a measurement uncertainty.The measurement uncertainty listed in each test record includes the best estimate of the errors contributed by the measurement, test equipment, standards, and other correction factors (for example, calibration factors and mismatch error) based on the suggested equipment, the equipment setup,and the prescribed test procedure. Most of the uncertainties are type-B per the ISO/IEC TAG 4 Guide for the expression of Uncertainty in Measurement (GUM).

3-4 MG369XA MM

Page 57

Performance Verification Measurement Uncertainty

Table 3-1. Recommended Test Equipment for Performance VerificationTests

INSTRUMENT

Spectrum Analyzer

Phase Noise Measure ment System

Modulation Analyzer

Frequency Counter

Power Meter with Power Sensor

Power Supply Output: +1V DC Agilent E3631A 3-13 Digital Multimeter

Function Generator DDS, 0.01 to 10 MHz HP33120A Digital Sampling

Oscilloscope Measuring Receiver Noise Floor: <–140 dBm @ 500 MHz Anritsu Model ML2530A 3-9

Frequency Reference

Local Oscillator Frequency: 0.01 to 40 GHz

Attenuator

Special AUX I/O Cable Assembly

Mixer Adapter, 2.4 (m) mm to

K (f) Adapter, 3.5 (m) mm to

BNC (f) Feed Through Termination

Tee Connectors: 50W BNC Any common source

Cables

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 Range: DC to 40 GHz Max Input Power: >+17 dBm Attenuation: 3, 6, 10, and 20 dB

Provides interface between the MG369XA and the Power Meter Frequency Range: 500 MHz to 40 GHz Conversion Loss: 10 dB (typical)

Frequency Range: 0.01 to 40 GHz

50W Any common source 3-13

50W BNC Any common source 3-13

Connectors: 50W BNC RF Connections: K-Cables

CRITICAL

SPECIFICATION

–12

parts/day

HP8565E 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 3-10, 3-12

Anritsu Model MF2414B 3-8

Anritsu Model ML2437A/38A with Power Sensor:

MA2474A (0.01 to 40 GHz) SC6230 (0.01 to 65 GHz)

Fluke 8840A 3-11, 3-12

Agilent 86100A with:

83484A 50 GHz Module

Absolute Time Corp., Model 300 3-6 Anritsu Model MG3694A with:

Options 3, 4 and 15 Anritsu, Model 41KC-3 Anritsu, Model 41KC-6 Anritsu, Model 41KC-10 Anritsu, Model 41KC-20

Anritsu P/N: 806-97 3-9

Anritsu P/N: 60-114 Any common source

(Agilent P/N: 11904-60003)

Any common source All tests

RECOMMENDED

MANUFACTURER/MODEL

TEST

NUMBER

3-7, 3-11,

3-13

3-8

3-9

3-11,3-12,

3-13 3-13

3-8, 3-9,

3-10, 3-12

3-12, 3-13

3-9, 3-10,

3-12 3-13

3-8, 3-9,

3-10, 3-11,

3-12

MG369XA MM 3-5

Page 58

Internal Time Base Aging Rate Test Performance Verification

3-6 Internal Time Base

Aging Rate Test

The following test can be used to verify that the MG369XA 10 MHz time base is within its aging specification. The instrument derives its frequency accuracy from an internal 10 MHz crystal oscillator stan

dard. (With Option 16 installed,frequency accuracy is derived from an internal high-stability 10 MHz crystal oscillator.) An inherent charac

teristic of crystal oscillators is the effect of crystal aging within the first few days to weeks of operation. Typically,the frequency of the crystal oscillator increases slightly at first,then settles to a relatively constant value for the rest of its life.

NOTE

Do not confuse crystal aging with other short term fre

quency instabilities, for example, noise and temperature. The internal time base of the instrument may not achieve its specified aging rate before the specified warm-up time of 7 to 30 days has elapsed;therefore, this performance test is optional.

For the greatest absolute frequency accuracy, allow the MG369XA to warm up until its RF output frequency has stabilized (usually 7 to 30 days). Once stabilized, the change in reference oscillator frequency should remain within the aging rate if (1) the time base oven is not allowed to cool, (2) the instrument orientation with respect to the earth's magnetic field is maintained, (3) the instrument does not sustain any mechanical shock, and (4) ambient temperature is held constant. This test should be performed upon receipt of the instrument and again after a period of several days to weeks to fully qualify the aging rate.

M G 3 6 9 X A

1 0 M H z R E F O U T

C lea r

F req ue n cy

Le ve l

M od ul ati on

S ys tem

Li ne

O pe ra te S tan db y

E ntr y

7 8 9

4 5 6

1 2 3

B ac k S pa ce

O utp u t

O n O f f

R F O u tp ut

+ /-

Figure 3-1. Equipment Setup for Internal Time Base Aging Rate Tests

Test Setup

Connect the MG369XA rear panel 10 MHz REF OUT to the frequency reference front panel input connec tor labeled 10 MHz when directed to do so during the test procedure.

F r e q u e n c y R e f e r e n c e

1 P P S

1 .5 M H z

1 0 M H z

A B S O L U T E T I M E

M o d e l 3 0 0 F r e q u e n c y R e f e r e n c e

1 0 M H z I n p u t

E S C

4 5

D E L

789

M O D

E N TE R

3-6 MG369XA MM

Page 59

Performance Verification Internal Time Base Aging Rate Test

Test Procedure

Step 1. Set up the frequency reference as follows:

The frequency error is measured at the start and finish of the test time period of 24 hours. The aging rate is the difference between the two error read ings.

a. Press the ESC key until the MAIN MENU is dis

played.

b. At the MAIN MENU display, press 1 to select the

CONFIGURATION MENU.

c. At the CONFIGURATION MENU display, press

8 to select MEAS.

d. Press the MOD key and use the Up/Down arrow

keys to get to the menu display: MEASUREMENT = FREQ.

Press the ENTER key.

Press the ESC key until the MAIN MENU is displayed.

g. At the MAIN MENU display, press 3 to select the

REVIEW MENU.

h. At the REVIEW MENU display, press 8 to select

TFM.

Step 2. Connect the MG369XA rear panel 10 MHz REF OUT

signal to the frequency reference front panel 10 MHz input.

Step 3. Wait approximately 90 minutes (default setting)

until the FMFOM on the frequency reference display decreases from 9 to 1. (The default setting is recommended to achieve optimum measurements.)

Step 4. The frequency error in the signal under test is

displayed in ps/s (picoseconds/second). For example, an error of –644681 ps/s is –644681 ´ 10 –6.44681 ´ 10 reference on the frequency reference.

Step 5. The frequency error display is continuously updated

as a running 5000-second average. The averaging smooths out the short-term instability of the oscillator.

Step 6. Record the frequency error value displayed on the

frequency reference in the test record.

–7

away from the 10 MHz internal

–12

MG369XA MM 3-7

Page 60

Internal Time Base Aging Rate Test Performance Verification

Step 7. Wait for 24 hours, then record the frequency error

value in the test record.

Step 8. The aging rate is the difference between the two

frequency error values.

Step 9. Record the computed result in the test record. To

meet the specification, the computed aging rate must be <2x10 Option 16).

–9

per day (<5x10

–10

per day with

3-8 MG369XA MM

Page 61

Performance Verification Spurious Signals Test

3-7 Spurious Signals Test The following tests can be used to verify that the signal generator

meets its spurious emissions specifications for RF output signals from

0.01 to 50 GHz. The MG369XA’s CW RF output signal is fed directly into a spectrum

analyzer. The CW frequency and power level is referenced and a peak search function on the spectrum analyzer is utilized to find any spuri ous signals above the specified limit.

M G 3 6 9 X A

1 0 M H z R E F O U T

C lea r

F req u en cy

L ev el

M od ul at ion

S ys tem

L ine

O pe ra te S tan d by

Figure 3-2. Equipment Setup for Spurious Signals Test

B ac k

E ntr y

S pa ce

7 8 9

4 5 6

1 2 3

O ut pu t

O n O ff

R F Ou tp ut

5 0

+ /-

R F O U T

Test Setup

Step 1. Connect the MG369XA rear panel 10 MHz REF OUT

Step 2. Connect the MG369XA RF Output to the spectrum

S p e c t r u m A n a l y z e r

E X T R E F

I N P U T

R F I N

Connect the equipment, shown in Figure 3-2, as fol lows:

to the spectrum analyzer's external reference input.

analyzer's RF input.

Step 3. Set up the spectrum analyzer as follows:

NOTE

Power line and fan rotation spurious

Press the PRESET key.

Press the AMPLITUDE key and enter +10 dBm.

emissionsare tested aspartof the single

sidebandphase noisetest inSection3-8.

Press the BW key, then select MAN (manual) and enter 30 kHz.

Press the MKR key and select MORE1OF2.

Select PEAK THRESHOLD and enter –62 dBm.

MG369XA MM 3-9

Page 62

Spurious Signals Test Performance Verification

Test Procedure

NOTES

For greater accuracy, the frequency span can be searched piecewise by setting a narrower span. This is done by setting the desired START FREQ and STOP FREQ selections on the SPAN menu.

If no spurs peak above the threshold, then a peak will not be found.

Spurious signals tested in this section are grouped as harmonic related or non-harmonic. If spurious signals are found, it is important to determine the type of spur and use the appropriate specified limit.

The following procedure lets you measure the worst case spurious signals (harmonic and non-harmonic up to 50 GHz) of the MG369XA’s RF output.

Step 1. Set up the MG369XA as follows:

Reset the instrument by pressing SYSTEM,then Reset. Upon reset, the CW menu is displayed.

Press Edit F1 to open the current frequency pa rameter for editing and set F1 to 10 MHz (2 GHz for models without Options 4 or 5).

Press Edit L1 to open the current power level pa rameter for editing.

d. For models without Option 15, set L1 to the

lesser of +10 dBm or to the maximum specified power level. For models with Option 15,set L1 to the maximum specified power level. (Refer to Appendix B, Performance Specifications, for the maximum specified power levels.)

Step 2. Set up the spectrum analyzer as follows:

Press the AMPLITUDE key and enter the current power level setting (L1) of the MG369XA.

Press the FREQUENCY key and enter the current frequency setting (F1) of the MG369XA.

Press the SPAN key and enter 10 MHz.

Press the PEAK SEARCH key,then select MARKER DELTA.

Press the SPAN key and select FULL SPAN.

Select NEXT PK LEFT or NEXT PK RIGHT to search for any spurs above the threshold level.

Step 3. Record the displayed marker delta values of any

spurious signals above specification in the test record.

Step 4.

Step 5. Repeat Steps 2 through 4 for each of the test

Continue selecting NEXT PK LEFT and NEXT PK RIGHT until the entire span has been searched and

record the displayed marker delta values of any spurious signals above specification in the test record.

frequencies listed in the test record.

3-10 MG369XA MM

Page 63

Performance Verification Single Sideband Phase Noise Test

3-8 Single Sideband

Phase Noise Test

The following test can be used to verify that the MG369XA meets its single sideband phase noise specifications. For this test,an Anritsu MG3694A (with Options 3 and 4) signal generator is required to act as a local oscillator (LO). Table 3-2, below, lists the single side band re quirements for the local oscillator.

The CW RF output of the MG369XA under test (DUT) is mixed with the CW RF output from the MG3694A LO, which is offset by 100 MHz. Single sideband phase noise is measured at offsets of 10 Hz, 100 Hz, 1 kHz, 10 kHz,100 kHz, and 1 MHz away from the resultant 100 MHz IF.

Table 3-2. Single Side Band Requirements for Local Oscillator

Offset From Carrier

Frequency Range

10 Hz 100 Hz 1 kHz 10 kHz 100 kHz 1 MHz

³10 MHz to £15.625 MHz –105 –126 –139 –142 –141 –145

>15.625 MHz to £31.25 MHz –99 –120 –134 –137 –137 –145

>31.25 MHz to £62.5 MHz –90 –114 –129 –136 –136 –144

>62.5 MHz to £125 MHz –84 –108 –127 –135 –133 –144

>125 MHz to £250 MHz –88 –102 –125 –132 –130 –143

>15.625 MHz to £500 MHz –77 –99 –123 –125 –124 –142

>500 MHz to £1050 MHz –71 –93 –118 –121 –119 –138

>1050 MHz to £2200 MHz –66 –86 –112 –115 –113 –135

>2.2 GHz to £6 GHz –54 –77 –104 –108 –107 –130

>6 GHz to £10 GHz –52 –73 –100 –107 –107 –128 >10 GHz to £20 GHz –45 –68 –94 –102 –102 –125 >20 GHz to £40 GHz –45 –63 –92 –98 –98 –119

MG369XA MM 3-11

Page 64

Single Sideband Phase Noise Test Performance Verification

P N 9 0 0 0

P h a s e N o i s e

M e a s u r e m e n t S y s t e m

P N 9 0 0 0

P H A S E N O I S E

M E A S U R E M E N T

S Y S T E M

R E M .

E R R .

M E A S .

B A T T .

O N

S T D B Y

L I N E

S T A T U S

P N 9 0 6 0 - 00

C o n n e c t t o E F C I n p u t f o r F r e q u e n c i e s < 2 . 0 G H z

G P I B I n t e r f a c e C a b l e

P N 9 0 0 0 R e a r P a n e l

D C - 1 0 M H z

N O I S E D E M O D

O U T P U T

+ 1 0 V p 6 0 0

N O I S E

O U T P U T

P N 9 4 7 0 - 00

P H A S E

5 M H z - 2 6 .5 G H z

+ P/ 8

R F IN P U T

- 10 / + 1 3 d B m M A X

- P/ 8

5 0

T U N E V O L T A G E

E X T E R N A L IN P U T

5 0 0 m V M A X

1 0 0

O U T P U T

+ 2 0 d B m M A X

+ 2 0 V p 6 0 0

L O C K

P H A S E D E T E C T O R

C O N T R O L

P N 9 4 5 0 - 00

P N 9 3 4 2 - 01

O C X O

L O IN P U T

F c . T U N E

+ 7 d B m M IN

5 0

2 n d L O IN P U T

0 /+ 1 0 V p + 1 0 H z

+ 7 d B m M IN

5 0

F c 1 0 0 M H z

R F S T D

O U T P U T

R F H L

+ 1 0 d B m 50

W A V E

E X T E R N A L

C R Y S T A L

O S C I L L A T O R

P N 9 5 3 0 - 00

Figure 3-3. Equipment Setup for Single Sideband Phase Noise Test

Test Setup

The PN9000 software must be installed and set up in accordance with the instructions supplied with the phase noise measurement system before continuing with this procedure.

Connect the equipment, shown in Figure 3-3, as follows:

M G 3 6 9 4 A ( L O )

C l ear

Fr equ en cy

Le ve l

M odu lat ion

Sy ste m

Li ne

O per ate St an dby

IN P U T

En try

7 8 9

4 5 6

1 2 3

Ba ck Sp ac e

O utp ut

O nO ff

R F O utp ut

+ /-

M G 3 6 9 X A ( D U T )

C l ear

Fr equ en cy

Le ve l

M odu lat ion

Sy ste m

Li ne

O per ate St an dby

En try

7 8 9

4 5 6

1 2 3

Ba ck

Sp ac e

O utp ut

O nO ff

R F O utp ut

+ /-

Step 1. Connect a GPIB interface cable from the PN9000

system to the MG3694A (LO) rear panel IEEE-488 GPIB connector.

Step 2. Connect a GPIB interface cable from the PN9000

system to the MG369XA (DUT) rear panel IEEE-488 GPIB connector.

Step 3. Connect the MG3694A (LO) RF Output to the LO

INPUT of the PN9000 phase detector module.

Step 4. Connect the MG369XA (DUT) RF Output to the RF

INPUT of the PN9000 phase detector module.

Step 5. On the PN9000 system,connect the Fc. 100 MHz

OUTPUT of the crystal oscillator module to the 2nd LO INPUT of the phase detector module.

Step 6. On the PN9000 system,connect the TUNE

VOLTAGE OUTPUT of the lock control module to the Fc. TUNE INPUT of the crystal oscillator module.

3-12 MG369XA MM

Page 65

Performance Verification Single Sideband Phase Noise Test

Test Procedure

Step 1. Set the MG369XA (DUT) GPIB address as follows:

Step 2. Set the MG3694A (LO) GPIB address by following

Step 3. Set up the PN9000 system as follows:

The following procedure lets you measure the RF output single sideband phase noise levels to verify that they meet specifications.

Press SYSTEM, then Config.The System Configu ration menu is displayed.

Press GPIB to display the Configure GPIB menu.

Press GPIB Address to change the current ad dress of the MG369XA (DUT).

d. Enter a new address using the cursor control key

or the data entry keypad and the Enter termina tor key.

e. The new address will appear on the display. The

entry must be between 1 and 30 to be valid.

the procedure in Step 1. The GPIB address set must be different from the one set for the MG369XA (DUT) in Step 1.

Select the Measure/Graph menu:

(1) Set Log. Fmin = 10 Hz (2) Set Log. Fmax = 1 MHz (3) Set Level max = –40 dB (4) Set Level min = –150 dB

Select the Status/Average menu:

(1) Set Average = On (2) Set 10/100Hz = 10* (3) Set 100/1kHz = 20* (4) Set 1K/10kHz = 20* (5) Set 10K/100kHz = 20* (6) Set 100K/1MHz = 20*

* For a test frequency of 9.999999 MHz, set

this parameter to 40.

MG369XA MM 3-13

Page 66

Single Sideband Phase Noise Test Performance Verification

c. Set “Vcontrol=5Volts” (in the bottom status bar)

by pressing the following on the keyboard:

Tab | Enter|5|Enter

This sets the “VCO-100MHz” frequency tune control to the middle of its range.

Select the Calib/Input menu:

(1) Set Source RF driver to Wiltron 6700 (2) Set Source LO driver to Wiltron 6700

NOTE

When measuring frequencies less than 1.8 GHz, the Tune Voltage on the PN9000 must also be connected to the LO EFC input.

(3) Set Offset LO to the value stated in Ta

ble 3-3 (page 3-17) for the current test fre quency.

(4) Set RF Phase Detection to the mode

stated in Table 3-3 for the current test fre quency.

(5) For test frequencies greater than 1.8 GHz,

set RF Phase Detection = Transposition. For test frequencies less than 1.8 GHz, set

RF Phase Detection = Standard 5 dBm and connect the LO EFC to the PN9000 Tune Voltage using a BNC tee.

Select the Calib/RF menu:

(1) Set Freq = to the frequency indicated in

the test record

(2) Set Level = Value stated in Table 3-3 for

the current test frequency.

Select the Calib/LO menu:

(1) Set Freq = Frequency stated in Table 3-3

for the current test frequency.

(2) Set Level = Value stated in Table 3-3 for

the current test frequency.

When you exit the Calib/LO menu,the offset is automatically added to the LO frequency (displayed in the bottom status bar).

Select the Calib/VCO menu:

(1) For test frequencies greater than 1.8 GHz,

set VCO1 = 100 MHz on. For test frequencies less than 1.8 GHz, set

VCO1 = Off.

3-14 MG369XA MM

Page 67

Performance Verification Single Sideband Phase Noise Test

Select the Calib/Fcounter menu:

(1)

Select Freq IF and press <Enter> A frequency close to the difference of the RF and LO frequencies is displayed in the menu item.

(2) Press Esc to exit the menu

i. Press the CTRL+ F keys to obtain a frequency

beat. A very low frequency beat (<10 Hz) should be obtained, indicating that the correct carrier frequency is programmed.

Step 4. Calibrate and lock the PN9000 system as follows:

Select the Lock/Def. Loop menu:

(1) Set Loop BW = Value stated in Table 3-3

for the current frequency parameter.

(2) Set Tune Slope = Value stated in Table 3-3

for the current frequency parameter.

(3) Set Maximum BW = Value stated in Ta-

ble 3-3 for the current frequency parameter.

b. Offset the frequency of the MG369XA (DUT) as

follows:

(1) Press Local to return the instrument to lo-

cal control

(2) Offset the frequency by 1 kHz

On the PN9000 system, select the Calib/Exec Cal menu, then select OK.

d. After calibration, remove the 1 kHz offset on the

MG362XA (DUT), then press <Enter> to continue.

e. For test frequencies greater 1.8 GHz,select the

Lock/AutoLock menu:

(1) SetVmin=0V (2) Set Vmax = +10 V (3) Select OK MWAVE to perform the auto

matic locking process. The system will check that conditions for locking are met, measure the tune slope of the reference source, and look for the locking voltage.

(4)When this process completes, press

<Enter> to continue.

For test frequencies less than 1.8 GHz, select Lock/ExecLock to lock the PN9000 system.

MG369XA MM 3-15

Page 68

Single Sideband Phase Noise Test Performance Verification

NOTE

For test frequencies less than

1.8GHz,select Lock/LockOff toturn off locking prior to testing the next test frequency.

Step 5.

Step 6. When the measurement completes, select the

Step 7. Use the arrow keys on the keyboard to move the

Step 8. Record the displayed phase noise levels at 10 Hz,

Step 9. Record any power line and fan rotation spurious

On the PN9000 system, select the Measure menu, then select OK to perform the measurement. When prompted for curve name, press N for no.

Process/Marker menu:

a. Set Marker = curveM

b. Set Type = Vert.line

c. Set Color = Green (or color of choice)

d. Select OK and press Esc.

marker to the desired frequency offset (displayed on the lower right of the screen).

100 Hz, 1 kHz,10 kHz, 100 kHz,and 1 MHz offset from the carrier frequency in the test record.

emissions above the specified limits in the test record.

Step 10. Repeat Steps 3 through 9 for all frequencies listed in

the test record.

3-16 MG369XA MM

Page 69

Performance Verification Single Sideband Phase Noise Test

Table 3-3. PN9000 Phase Noise Test Table (1 of 2)

Test

Frequency

Notes:

LO Offset

Phase

Detection

Frequency

Power

Level

Frequency

Power

Level

9.999999 MHz 15 MHz 30 MHz 60 MHz 120 MHz 250 MHz 499 MHz 600 MHz 1.99 GHz

Models

with

Option 22

Only

0 Hz 0 Hz 0 Hz 0 Hz 0 Hz 0 Hz 0 Hz 0 Hz 100 MHz

Standard Standard Standard Standard Standard Standard Standard Standard

9.999999 MHz

10 dBm 10 dBm 10 dBm 10 dBm 10 dBm 10 dBm 10 dBm 10 dBm 10 dBm

10 MHz 15.1 MHz 30.1 MHz 60.1 MHz 120.1 MHz 250.1 MHz 499.1 MHz 600.1 MHz 2.09 GHz

10 dBm 10 dBm 10 dBm 10 dBm 10 dBm 10 dBm 10 dBm 10 dBm 10 dBm

15 MHz 30 MHz 60 MHz 120 MHz 250 MHz 499 MHz 600 MHz 1.99 GHz

Models with Option 4 Only

Calib/Input Menu:

Calib/RF Menu:

Calib/LO Menu:

Models with Option 5

Only

Transposi

tion

Loop BW

Tune Slope

Max BW

Lock/Define Loop Menu:

6Hz 25 Hz/V

300 Hz 320 Hz 320 Hz 320 Hz 320 Hz 320 Hz 320 Hz 320 Hz 2 kHz

10 Hz 75 Hz 86 Hz 75 Hz 75 Hz 90 Hz 100 Hz 100 Hz

40 Hz/V 40 Hz/V 86 Hz/V 172 Hz/V 172 Hz/V 333 Hz/V 420 Hz/V 210 Hz/V

MG369XA MM 3-17

Page 70

Single Sideband Phase Noise Test Performance Verification

Table 3-3. PN9000 Phase Noise Test Table (2 of 2)

Test

Frequency 2.01 GHz 2.19 GHz 2.21 GHz 6 GHz 8 GHz 10 GHz 19.99 GHz 20.01 GHz 25 GHz

Notes:

LO Offset

Phase

Detection

Frequency

Power

Level

Frequency

Power

Level

Loop BW

Tune Slope

Max BW

All Models

without

Option 4

0Hz 0Hz 0Hz –100MHz –100 MHz –100 MHz –100 MHz –100 MHz –100 MHz

Transposi

tion

2.01 GHz 2.19 GHz 2.21 GHz 6 GHz 8 GHz 10 GHz 19.99 GHz 20.01 GHz 25 GHz

The lesser of +10 dBm or maximum specified leveled output power

1.91 GHz 2.09 GHz 2.11 GHz 6 GHz 8 GHz 10 GHz 19.99 GHz 20.01 GHz 25 GHz

The lesser of +10 dBm or maximum specified leveled output power

100 Hz 100 Hz 100 Hz 100 Hz 100 Hz 100 Hz 100 Hz 100 Hz 100 Hz

210 Hz/V 210 Hz/V 210 Hz/V 210 Hz/V 210 Hz/V 210 Hz/V 210 Hz/V 210 Hz/V 210 Hz/V

2 kHz 2 kHz 2 kHz 2 kHz 2 kHz 2 kHz 2 kHz 2 kHz 2 kHz

Models with Option 4

Only

Transposi

tion

Transposi

tion

All Models

Calib/Input Menu:

Transposi

tion

Calib/RF Menu:

Calib/LO Menu:

Lock/Define Loop Menu:

MG3691A

Transposi

Only

tion

Transposi

All Models

tion

Transposi

tion

All Models >20 GHz

Only

Transposi

tion

Transposi

tion

3-18 MG369XA MM

Page 71

Performance Verification Power Level Accuracy and Flatness Tests

3-9 Power Level

Accuracy and Flatness Tests

The following tests can be used to verify that the MG369XA meets its power level specifications. Power level verifications are divided into four parts—log conformity, power level accuracy (to –60 dBm), power level accuracy (–60 dBm to –120 dBm), and power level flatness.

S E Q S Y N C

H O R I Z O U T

A U X

I / O

P / N 8 0 6 - 9 0

I N P U T 2

A N A L O G

C le a r

F re q ue n cy

L ev e l

M o du la ti on

S ys te m

L in e

O p er at e S ta n db y

E nt ry

7 8 9

4 5 6

1 2 3

B ac k

S pa c e

O u tp ut

O n O f f

R F O u tp ut

5 0

+ /-

R F O U T

P o w e r

M G 3 6 9 X A

S e n s o r

Figure 3-4. Equipment Setup for Power Level Accuracy and Flatness Tests Above –60 dBm

I N P U T 1 D I G I T A L

P o w e r M e t e r

Test Setup

Step 1. Calibrate the power meter with the appropriate

Step 2. Connect the power sensor to the RF Output of the

Step 3. Connect the special AUX I/O interface cable (Anritsu

For all power level measurements above –60 dBm, connect the equipment, shown in Figure 3-4, as follows:

power sensor.

MG369XA.

Part No. 806-90) to the MG369XA rear panel AUX I/O connector. Connect the cable BNC connectors as follows:

Connect the cable labeled “SEQ SYNC” to the power meter rear panel INPUT 1 DIGITALconnec tor.

Connect the cable labeled “HORIZ OUT” to the power meter rear panel INPUT 2 ANALOG con

nector.

MG369XA MM 3-19

Page 72

Power Level Accuracy and Flatness Tests Performance Verification

Power Level Log Conformity

Step 1. Set up the power meter as follows:

Step 2. Set up the MG369XA as follows:

The log conformity test verifies the dynamic range and level accuracy of the Automatic Level Control (ALC) loop. Power level accuracy is tested in both pulse (if equipped) and non-pulse modes by stepping the output power level down in 1 dB increments from its maximum rated power level and measuring the output power level at each step.

a. Reset the power meter by pressing:

System | Setup | -more- | PRESET | RESET.

b. Configure the power meter to perform power

measurements by pressing: Sensor | Setup | MODE | Default.

c. Configure the power sensor’s calibration factor

source by pressing: Sensor | CalFactor | SOURCE | V/GHz.

d. Press any hard key to begin the measurement.

Reset the instrument by pressing SYSTEM,then Reset. Upon reset, the CW menu is displayed.

NOTE

Formodels with Option 22,ratedoutput power is reduced by 2 dB.

b. If the DUT has a step attenuator (Option 2):

(1)

Press Level to open the Level Control menu.

Press ALC Mode, then press Attenuate> to

(2)

open the Attenuator Control menu. Press Decouple to decouple the attenuator

(3)

from the ALC loop.

Press Frequency to open the current frequency parameter for editing.

d. Set F1 to the CW frequency indicated in the test

record.

Press Edit L1 to open the current power level pa rameter for editing.

f. Set L1 to the first applicable power level indi

cated in the test record.

Step 3. Measure the output power level with the power

meter and record the reading in the test record.

3-20 MG369XA MM

Page 73

Performance Verification Power Level Accuracy and Flatness Tests

Step 4. On the MG369XA, use the cursor control key

(diamond-shaped key) to decrement L1 to the next test power level in the test record. Measure and record the power meter reading in the test record.

Step 5. Repeat Step 4 for each of the test power levels listed

in the test record for the current CW frequency.

Step 6. Repeat Steps 2c through 5 for all CW frequencies

listed in the test record.

Step 7. For models with pulse modulation:

Press Modulation to open the Modulation menu.

Press Pulse, then select external pulse mode by pressing Internal/External, if required.

Turn the pulse mode on by pressing On/Off.

d. Repeat Steps 2c through 6.

MG369XA MM 3-21

Page 74

Power Level Accuracy and Flatness Tests Performance Verification

Power Level Accuracy (³ –60 dBm)

Step 1. Set up the power meter as follows:

Step 2. Set up the MG369XA as follows:

Power level accuracy for power levels of –60 dBm and above are tested by stepping the output power level down in 5 dB increments from its maximum rated power level and measuring the output power level using a power meter at each step.

a. Reset the power meter by pressing:

System | Setup | -more- | PRESET | RESET.

b. Configure the power meter to perform power

measurements by pressing: Sensor | Setup | MODE | Default.

c. Configure the power sensor’s calibration factor

source by pressing: Sensor | CalFactor | SOURCE | V/GHz.

d. Press any hard key to begin the measurement.

Reset the instrument by pressing SYSTEM,then Reset. Upon reset, the CW menu is displayed.

Press Edit F1 to open the current frequency parameter for editing.

NOTE

Formodels with Option 22,ratedoutput power is reduced by 2 dB.

c. Set F1 to the CW frequency indicated in the test

record.

Press Edit L1 to open the current power level pa rameter for editing.

e. Set L1 to the power level indicated in the test re

cord.

Step 3. Measure the output power level with the power

meter and record the reading in the test record.

Step 4. On the MG369XA, use the cursor control key

(diamond-shaped key) to decrement L1 to the next test power level in the test record. Measure and record the power meter reading in the test record.

Step 5. Repeat Step 4 for each of the test power levels listed

in the test record (down to –60 dBm) for the current CW frequency.

Step 6. Repeat Steps 2b through 5 for all CW frequencies

listed in the test record.

3-22 MG369XA MM

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Performance Verification Power Level Accuracy and Flatness Tests

10 MHz Reference Out

Measuring Receiver

RF Input

Power Level Accuracy (< –60 dBm)

Power level accuracy for power levels below –60 dBm is tested in two methods. First, by measur ing the MG369XA’s RF output directly on a measur ing receiver; second, by down converting the MG369XA’s RF output and measuring the down con verted IF on a measuring receiver. In both cases, a reference power level is set on the measuring re

ceiver and the output power level is stepped down in 5 dB increments. The relative output power level is then measured at each step.

10 MHz REF IN

MG369XA (DUT)Local Oscillator

Down Conversion Path

Mixer

Connect the dashed lines as directed by the procedure.

Through Path

Figure 3-5. Equipment Setup for Power Level Accuracy and Flatness Tests Below –60 dBm

Test Setup

For all power level measurements below –60 dBm, connect the equipment, shown in Figure 3-5, as fol lows:

Step 1. For RF frequencies below 1300 MHz, connect the

MG369XA RF Output to the RF input of the measuring receiver.

Step 2. For RF frequencies above 1300 MHz:

Connect the RF Output of the LO and the MG369XA to the mixer’s (P/N: 60-114) L- and R-ports, respectively, using low loss cables.

b. Connect the mixer’s I-port to the RF input of the

measuring receiver.

Step 3. Using a BNC tee,connect the 10 MHz reference

output from the measuring receiver to the MG369XA’s and local oscillator’s 10 MHz REF IN connectors.

MG369XA MM 3-23

Page 76

Power Level Accuracy and Flatness Tests Performance Verification

Test Procedure

Step 1. Set up the MG369XA as follows:

Step 2. If measuring frequencies below 1300 MHz, connect

Step 3. If measuring frequencies above 1300 MHz, connect

The following procedure lets you verify the power ac curacy and flatness for all power level measure ments below –60 dBm.

Reset the instrument by pressing SYSTEM,then Reset. Upon reset, the CW menu is displayed.

Press Edit F1 to open the current frequency pa rameter for editing.

c. Set F1 to the CW frequency indicated in the test

record.

Press Edit L1 to open the current power level pa rameter for editing.

e. Set L1 to –50 dBm.

the MG369XA RF Output directly to the measuring receiver’s RF input.

the MG369XA RF Output to the mixer’s R-input port and set up the LO as follows:

NOTE

When measuring frequencies above 1300MHz,the LO,DUT,andmeasuring receiver should be connected to the mixer and the measuring receiver should be set to measure 8.51 MHz.

Reset the instrument by pressing SYSTEM,then Reset. Upon reset, the CW menu is displayed.

Press Edit F1 to open the current frequency pa rameter for editing.

c. Set F1 to the LO CW frequency indicated in the

test record.

Press Edit L1 to open the current power level pa rameter for editing.

e. Set L1 to +13 dBm.

Step 4. Set up the measuring receiver as follows:

a. Reset the receiver by pressing the Preset key.

b. Press the Freq key, then select Frequency Span

and enter 10 kHz.

c. Press the BW key, then select Manual and enter

10 Hz.

d. Press the Average key and select Average On.

e. Press the Freq key and enter the CW frequency

listed in the test record.

3-24 MG369XA MM

Page 77

Performance Verification Power Level Accuracy and Flatness Tests

f. Press Restart and wait for the averaging count to

finish (Average: 8/8).

g. Read the measured value and calculate the line

(and mixer) loss offset as follows:

|Receiver Reading|– 50 dBm = Offset

The offset value should be a positive number.

h. Press the Offset key and select Offset On.

i. Select Offset Value and enter the offset value that

was calculated above.The displayed reading on the measuring receiver should be –50.000 dBm. If not, repeat Steps f through i.

Step 5. On the MG369XA, set L1 to the power level

NOTE

When making power level changes greater than 15 dB, the first measurement should be thrown out to allow for the measuring receiver to auto range.

Step 6. Measure the relative output power level by pressing

indicated in the test record starting with –65 dBm.

the Restart key on the measuring receiver and wait for the averaging count to complete (Average: 8/8). Record the reading in the test record.

Step 7. Repeat Steps 5 and 6 for each of the test power

levels listed in the test record for the current CW frequency.

Step 8. Repeat Steps 1b through 7 for all CW frequencies

listed in the test record.

MG369XA MM 3-25

Page 78

Power Level Accuracy and Flatness Tests Performance Verification

Power Level Flatness

Step 1. Connect the equipment as shown in Figure 3-4 on

Step 2. Set up the MG369XA as follows:

Power level flatness is tested by measuring the out put power level variation during a full band sweep in the manual sweep mode.

page 3-19.

Reset the instrument by pressing SYSTEM,then Reset. The CW menu is displayed.

Press Manual Sweep to place the instrument in the manual sweep frequency mode and to display the Manual Sweep menu.

c. With the Manual Sweep menu displayed, press

the menu soft key:

FREQUENCY

CONTROL

d. The Sweep Frequency Control menu is then dis-

played.

Press Full to select a full range frequency sweep.

Press Edit L1 to open the current power level parameter for editing.

NOTE

Be sure to use and calibrate the appro priate power sensor for the frequency being measured.

g. Set L1 to the power level indicated in the test re-

cord.

h. Return to the Manual Sweep menu by pressing

the <Previous soft key.

At the Manual Sweep menu, press Num of Steps to open the number-of-steps parameter for edit ing.

j. Set the number-of-steps to 200.

k. Press the menu soft key:

FREQUENCY

CONTROL

Step 3. Using the rotary data knob, sweep the MG369XA

through the full frequency range. Measure the

maximum and minimum power meter readings and record the variation (difference between the maximum and minimum readings) in the test record. Verify that the variation does not exceed the value noted in the test record.

3-26 MG369XA MM

Page 79

Performance Verification Power Level Accuracy and Flatness Tests

Maximum Leveled Power

Step 1. Connect the equipment as shown in Figure 3-4 on

Step 2. Set up the MG369XA for a manual sweep as follows:

Maximum leveled power is tested by measuring the output power level during a full band sweep in the manual sweep mode.

page 3-19.

Reset the instrument by pressing SYSTEM,then Reset. The CW menu is displayed.

Press Manual Sweep to place the instrument in the manual sweep frequency mode and to display the Manual Sweep menu.

c. With the Manual Sweep menu displayed, press

the menu soft key:

FREQUENCY

CONTROL

d. The Sweep Frequency Control menu is then dis-

played.

Press Full to select a full range frequency sweep.

Press Edit L1 to open the current power level parameter for editing.

NOTE

Be sure to use and calibrate the appro priate power sensor for the frequency being measured.

g. Set L1 to the power level noted in the test record.

h. Return to the Manual Sweep menu by pressing

the <Previous soft key.

i. At the Manual Sweep menu, press the soft key

Num of Steps to open the number-of-steps param eter for editing.

j. Set the number-of-steps to 200.

k. Press the menu soft key:

FREQUENCY

CONTROL

Step 3. Using the rotary data knob, sweep the MG369XA

through the full frequency range. Measure the

minimum power meter readings and record the values in the test record. Verify that the minimum readings do not exceed the value noted in the test record.

MG369XA MM 3-27

Page 80

Residual FM Tests Performance Verification

Modulation Analyzer

3-10 Residual FM Tests This procedure verifies the frequency stability of the MG369XA RF

output when in the locked mode and when the FM input circuitry is active, but not modulating the RF output.

The RF output of the MG369XA is down converted to a frequency that a modulation analyzer can read. This is accomplished with the use of an RF mixer and a local oscillator.The IF output from the mixer is fed to a modulation analyzer where the residual FM is measured.

10 MHz REF IN

Local Oscillator

10 MHz Reference Out

Figure 3-6. Equipment Setup for Residual FM Tests

Test Setup

10 MHz REF IN

MG369XA (DUT)

Mixer

Connect the equipment, shown in Figure 3-6, as fol lows:

Step 1. Using a BNC tee,connect the 10 MHz reference

output from the modulation analyzer to the MG369XA’s and local oscillator’s 10 MHz REF IN connectors.

Step 2.

Connect the RF Output from the LO to the L-input on the mixer.

Step 3.

Connect the RF Output from the DUT to the R-input on the mixer.

Step 4. Connect the RF input of the modulation analyzer to

the I-output from the mixer.

3-28 MG369XA MM

Page 81

Performance Verification Residual FM Tests

Locked FM Mode Off

Step 1. Set up the LO as follows:

Step 2. Set up the MG369XA as follows:

The following procedure lets you measure residual FM in the normal locked mode (modulation circuits not active):

Reset the instrument by pressing SYSTEM,then Reset. Upon reset, the CW menu is displayed.

Press Edit L1 to open the current power level pa rameter for editing.

c. Set L1 to +13 dBm.

Press Edit F1 to open the current frequency pa rameter for editing.

e. Set F1 to 1800 MHz.

Reset the instrument by pressing SYSTEM,then Reset. Upon reset, the CW menu is displayed.

Press Edit L1 to open the current power level parameter for editing.

c. Set L1 to the lesser of +10 dBm or the maximum

leveled power level for the instrument being tested (refer to Appendix B, Performance Specifications).

Press Edit F1 to open the current frequency pa rameter for editing.

e. Set F1 to 2100 MHz.

Step 3. Set up the modulation analyzer as follows:

Press the 50 Hz HP Filter key and the 15 KHz LP Filter key.

Press the FM key to set up an FM measurement.

Press the AVG key to set averaging mode on.

Step 4. Enter the reading from the modulation analyzer into

the test record and verify that the measurement meets specification.

Step 5. Repeat the measurement for each of the LO and

DUT frequency pairs listed in the test record.

MG369XA MM 3-29

Page 82

Residual FM Tests Performance Verification

Locked FM Mode On

Step 1. Repeat Steps 1 through 3 in the Locked FM Mode

Step 2. On the DUT,access the FM Status menu by pressing

Step 3.

Step 4.

Step 5. Enter the reading from the modulation analyzer into

Step 6. Repeat the measurement for each of the LO and

The following procedure lets you measure residual FM with the locked FM mode on (modulation cir cuits active):

Off test procedure above.

Modulation, then FM.

Select external FM by pressing the Internal/External key,if required.

Turn on external FM by pressing the On/Off key.

NOTE

Ensure that no connection is made to the rear panel FM input.

the test record and verify that the measurement meets specification.

DUT frequency pairs in the test record.

Unlocked Narrow FM Mode On

Step 1. Repeat Steps 1 through 3 in the Locked FM Mode

Step 2. On the DUT,access the FM Status menu by pressing

Step 3.

Step 4.

Step 5. Step 6. Select the Unlocked Narrow FM mode by pressing

The following procedure lets you measure residual FM with the unlocked narrow FM mode on (modulation circuits active):

Off test procedure above.

Modulation, then FM.

Select external FM by pressing the Internal/External key,if required.

Turn on external FM by pressing the On/Off key.

NOTE

Ensure that no connection is made to the rear panel FM input.

Access the FM modes by selecting Mode>.

Unlocked Narrow.

3-30 MG369XA MM

Page 83

Performance Verification Residual FM Tests

Step 7. Enter the reading from the modulation analyzer into

the test record and verify that the measurement meets specification.

Step 8. Repeat the measurement for each of the LO and

DUT frequency pairs listed in the test record.

Unlocked Wide FM Mode On

The following procedure lets you measure residual FM with the unlocked wide FM mode on (modula tion circuits active):

Step 1. Repeat Steps 1 through 3 in the Locked FM Mode

Off test procedure above.

Step 2. On the DUT,access the FM Status menu by pressing

Modulation, then FM.

Step 3.

Step 4.

Step 5. Step 6. Select the Unlocked Narrow FM mode by pressing

Step 7. Enter the reading from the modulation analyzer into

Select external FM by pressing the Internal/External key,if required.

Turn on External FM by pressing the On/Off key.

NOTE

Ensure that no connection is made to the rear panel FM input.

Access the FM modes by selecting Mode>.

Unlocked Wide.

the test record and verify that the measurement meets specification.

Step 8. Repeat the measurement for each of the LO and

DUT frequency pairs listed in the test record.

MG369XA MM 3-31

Page 84

Frequency Modulation Tests Performance Verification

3-11 Frequency

Modulation Tests

Function Generator

This section provides a manual procedure to verify the performance of the frequency and phase modulation of the MG369XA.

The RF Output of the MG369XA is modulated and monitored on a spectrum analyzer display. FM accuracy is determined by measuring the modulating input signal necessary to reduce the carrier level to its lowest level. When the carrier level reaches its lowest level, known as a Bessel null (Figure 3-8, following page), the actual deviation can be determined since the modulation rate is known. These tests quantify how the modulating input signal affects the signal generator’s RF out put.

Multimeter

To FM/ M IN

10 MHz REF OUT

MG369XA (DUT)

Figure 3-7. Equipment Setup for Frequency Modulation Tests

Test Setup

Step 1. Connect the MG369XA rear panel 10 MHz REF OUT

NOTE

An alternate procedure is described breifly at the end of this section.

Step 2. Connect the RF OUTPUTof the MG369XA to the

Step 3. Using a BNC tee,connect the function generator

Connect the equipment, shown in Figure 3-7, as fol lows:

to the spectrum analyzer’s external reference input.

spectrum analyzer’s RF input.

output to the multimeter’s input, and to the MG369XA’s rear panel FM/FM IN connector.

Spectrum Analyzer

3-32 MG369XA MM

Page 85

Performance Verification Frequency Modulation Tests

FM Attenuator The following procedure lets you measure the FM

attenuators of the modulation circuit. The values calculated in this procedure are used to verify the

NOTES

The FM calibration procedures use nar rowresolution bandwidth and zero span on the spectrum analyzer. For these measurements, it is important that the analyzer’scenter frequency be precisely aligned with the synthesizer’s carrier frequency. A single 10 MHz reference shouldbeusedfor the analyzer and syn thesizer. Generally, the most accurate source of the 10 MHz should be used as the common reference.

The FM and FM test procedures use modulation rates of 99.7 and 99.8 kHz, insteadof thespecified100 kHz,to avoid a spurious beat note that can interfere with the carrier frequency null measurement.

Step 1. Set up the function generator as follows:

Step 2. Set the multimeter to measure an AC signal by

Step 3. Set up the MG369XA as follows:

performance of the modulated RF output of the MG369XA.

FM STEP ATTENUATOR

a. Press the key to select the sine wave func

tion.

Press the Freq key and use the rotary knob to ad just the frequency output to 8.32 kHz.

Press the Ampl key and use the rotary knob to ad just the amplitude to 1.8 V

p-p

pressing VAC, then Auto. The multimeter reading should be approximately 0.636 V

rms

C E N T E R F R E Q U E N C Y

B E S S E L

N U L L

Figure 3-8. Typical Spectrum Analyzer Display

of a Bessel Null on an FM Wave form

Reset the instrument by pressing SYSTEM,then Reset. Upon reset, the CW menu is displayed.

Press Edit F1 to open the current frequency parameter for editing and set F1 to 5 GHz.

Press the Modulation | FM | Internal/External keys to select external FM.

Press Edit Sensitivity and set the sensitivity to 20 kHz/V.

Step 4. Set up the spectrum analyzer as follows:

Press the PRESET key to reset the instrument.

Press the FREQUENCY key and enter 5 GHz.

Press the BW key and set the RBW to 1 kHz and the VBW to 1 Hz.

Press the SPAN key and enter 0 MHz.

Press the PEAK SEARCH key,then select MARKER DELTA.

Step 5.

On the MG369XA, press On/Off to turn the locked FM mode on.

MG369XA MM 3-33

Page 86

Frequency Modulation Tests Performance Verification

Step 6. Locate the first Bessel null as follows:

a. Increase the function generator’s amplitude in

NOTES

When searching for a Bessel null using zero span on the spectrum analyzer,the displayedtrace will appear asahorizon tal line. When approaching the Bessel null,the RF carrier becomes much more sensitive to the modulating input level and the displayed trace will drop rap idly. If the carrier null is overshot, the trace will rapidly rise and begin to fall again when the second carrier null is approached. Be cautious to not over shoot the carrier null.

Step 7. Record the multimeter’s reading as V

Step 8. On the MG369XA, set the FM sensitivity to

100 mV increments until the carrier level on the spectrum analyzer’s display begins to drop, then adjust the function generator in 10 mV incre ments (within a range of 1.8 to 2.2 V

p-p

on the function generator’s display) until the carrier level is minimized.

b. Fine adjust the function generator’s amplitude in

1 mV increments to achieve the absolute mini

mum carrier level. The Dmarker level should be at least –50 dBc at the null. Typically, –55 dBc can be achieved.

in the test

record.

200 kHz/V.

Step 9. Set the function generator to 50 mV

p-p

Step 10. Locate the eighth Bessel null as follows:

a. Increase the function generator’s amplitude in

10 mV increments while observing the carrier level on the spectrum analyzer’s display. Count the carrier nulls as the modulation level is in creased.

b. At the eighth null,maximize the null depth by

adjusting the function generator’s amplitude in 1 mV increments to achieve the deepest null. The Dmarker level should be at least –50 dBc at the null. Typically, –60 dBc can be achieved.

Step 11. Record the multimeter’s reading as V

record.

in the test

3-34 MG369XA MM

Page 87

Performance Verification Frequency Modulation Tests

Step 12. Set the function generator to 83.2 kHz and 1.8 V Step 13. Locate the first Bessel null as follows:

a. Increase the function generator’s amplitude in

100 mV increments until the carrier level begins to drop, then adjust the function generator in 10 mV increments (within a range of 1.8 to

2.2 V

on the function generator’s display) until

p-p

the carrier level is minimized.

b. Fine adjust the function generator in 1 mV incre

ments to achieve absolute minimum carrier level. The Dmarker level should be at least –60 dBc at the null. Typically,–70 dBc can be achieved.

Step 14. Record the multimeter’s reading as V

in the test

record.

Step 15. On the MG369XA, set the FM sensitivity to

2.00 MHz/V.

Step 16. Set the function generator to 50 mV

p-p

Step 17. Locate the eighth Bessel null as follows:

p-p

a. Increase the function generator’s amplitude in

10 mV increments while observing the carrier level on the spectrum analyzer.Count the carrier nulls as the modulation level is increased.

b. At the eighth null,maximize the null depth by

adjusting the function generator’s amplitude in 1 mV increments to achieve the deepest null. The Dmarker level should be at least –50 dBc at the null. Typically, –60 dBc can be achieved.

Step 18. Record the multimeter’s reading as V

record.

in the test

MG369XA MM 3-35

Page 88

Frequency Modulation Tests Performance Verification

Step 19. On the MG369XA, set the FM sensitivity to

240 kHz/V.

Step 20. Set the function generator to 99.7 kHz and 1.8 V Step 21. Find the first Bessel null as follows:

a. Increase the function generator’s amplitude in

100 mV increments until the carrier level begins to drop, then adjust the function generator in 10 mV increments (within a range of 1.8 to

2.2 V

on the function generator’s display) until

p-p

the carrier level is minimized.

b. Fine adjust the function generator’s amplitude in

1 mV increments to achieve the absolute mini mum carrier level. The Dmarker level should be at least –60 dBc at the null. Typically, –70 dBc can be achieved.

Step 22. Record the multimeter’s reading as V

in the test

record.

Step 23. On the MG369XA, set the FM sensitivity to

2.40 MHz/V.

Step 24. Set the function generator to 50 mV

p-p

Step 25. Locate the eighth Bessel null as follows:

p-p

a. Increase the function generator’s amplitude in

10 mV increments while observing the carrier level on the spectrum analyzer.Count the carrier nulls as the modulation level is increased.

b. At the eighth null,maximize the null depth by

adjusting the function generator’s amplitude in 1 mV increments to achieve the deepest null. The Dmarker level should be at least –50 dBc at the null. Typically, –60 dBc can be achieved.

Step 26. Record the multimeter’s reading as V

in the test

record.

3-36 MG369XA MM

Page 89

Performance Verification Frequency Modulation Tests

Step 27. Calculate the following to four decimal places and

NOTE

If G

,orG3is <0.980 or >1.020, the

1,G2

FM step attenuator should be checked for an out-of-tolerance condition.

record the results in the test record:

09877=´

=´

GGG

12 1 2

=´´

G GGG

123123

=´

GGG

23 2 3

MG369XA MM 3-37

Page 90

Frequency Modulation Tests Performance Verification

FM VARIABLE ATTENUATOR

Step 28. On the MG369XA, set the FM sensitivity to

240 kHz/V.

Step 29. Set the function generator to 99.7 kHz and 1.8 V Step 30. Locate the first Bessel null as follows:

a. Increase the function generator’s amplitude in

100 mV increments until the carrier level begins to drop, then adjust the function generator in 10 mV increments (within a range of 1.8 to

2.2 V

on the function generator display) until

p-p

the carrier level is minimized.

b. Fine adjust the function generator in 1 mV incre

ments to achieve the absolute minimum carrier level. The Dmarker level should be at least –60 dBc at the null. Typically, –70 dBc can be achieved.

Step 31. Record the multimeter’s reading as V

in the test

record.

Step 32. On the MG369XA, set the FM sensitivity to

863 kHz/V.

Step 33. Set the function generator to 100 mV

p-p

Step 34. Locate the third Bessel null as follows:

p-p.

a. Increase the function generator’s amplitude in

10 mV increments while observing the carrier level. Count the carrier nulls as the modulation level is increased.

b. At the third null,maximize the null depth by ad

justing the function generator’s amplitude in 1 mV steps to achieve the deepest null. The Dmarker level should be at least –55 dBc at the null. Typically, –65 dBc can be achieved.

Step 35. Record the multimeter’s reading as V

in the test

record.

3-38 MG369XA MM

Page 91

Performance Verification Frequency Modulation Tests

Step 36. On the MG369XA, set the FM sensitivity to

1.8 MHz/V.

NOTE

If G

or G5is <0.980 or >1.020, the FM

Variable Gain must be calibrated.

Step 37. Set the function generator to 50 mV

p-p

Step 38. Locate the sixth Bessel null as follows:

a. Increase function generator’s amplitude in 10 mV

increments while observing the carrier level on the spectrum analyzer. Count the carrier nulls as the modulation level is increased.

b. At the sixth null,maximize the null depth by ad

justing the function generator’s amplitude in 1 mV steps to achieve the deepest null. The Dmarker level should be at least –50 dBc at the null. Typically, –60 dBc can be achieved.

Step 39. Record the multimeter’s reading as V

in the test

record.

Step 40. Calculate the following to four decimal places and

record the results in the test record:

MG369XA MM 3-39

Page 92

Frequency Modulation Tests Performance Verification

COMPOSITE FM ATTENUATOR ACCURACY

NOTE

If any of the GT

through GT16values

are <0.950 or >1.050, the FM Attenuators need to repaired or cali brated.

Step 41. Calculate the following to four decimal places and

record the results in the test record:

=´

GT G G

141

=´

GT G G

242

=´

GT G G

343

=´

GT G G

4412

=´

GT G G

5 4 123

=´

GT G G

651

=´

GT G G

752

=´

GT G G

853

=´

GT G G

9512

=´

GT G G

10 5 123

23 5

GTN

GTW

GTF

= largest of 1.0000, GT1,GT4,GT5,

max

,GT9,orGT10.

= smallest of 1.0000, GT1,GT4,GT5,

min

,GT9,orGT10.

= largest of 1.0000, GT2,GT3,GT4,

max

,GT8,orGT9.

= smallest of 1.0000, GT2,GT3,GT4,

min

,GT8,orGT9.

= largest of 1.0000, GT11,GT12,GT13,

max

,GT15,orGT16.

= smallest of 1.0000, GT11,GT12,

min

,GT14,GT15,orGT16.

3-40 MG369XA MM

Page 93

Performance Verification Frequency Modulation Tests

Locked FM Accuracy

NOTE

The first Bessel null at a modulation in dex of 2.405 will require a 99.8 kHz modulation rate at a deviation of 240 kHz.

FM accuracy is verified at 5 GHz and 20 GHz in both locked and locked low-noise modes of operation.

LOCKED EXTERNAL FM ACCURACY AT 5 GHz

Step 1. Set up the test equipment as described on page 3-32. Step 2. Set the multimeter to measure an AC signal by

pressing VACand Auto.

Step 3. Set up the function generator as follows:

Step 4. Set up the MG369XA as follows:

a. Press the key to select the sine wave func

tion.

Press the Freq key and use the rotary knob to ad just the frequency output to 99.8 kHz.

Press the Ampl key and use the rotary knob to adjust the amplitude to 1.8 V

Reset the instrument by pressing SYSTEM,then Reset. Upon reset, the CW menu is displayed.

p-p

Press Edit F1 to open the current frequency parameter for editing and set F1 to 5 GHz.

Press the Modulation | FM | Internal/External keys to select external FM.

Press Edit Sensitivity and set the sensitivity to 240 kHz/V.

Step 5. Set up the spectrum analyzer as follows:

Press the PRESET key to reset the instrument.

Press the FREQUENCY key and enter 5 GHz.

Press the BW key and set the RBW to 1 kHz and the VBW to 1 Hz.

Press the SPAN key and enter 0 MHz.

Press the PEAK SEARCH key,then select MARKER DELTA.

Step 6.

On the MG369XA, press On/Off to turn the locked FM mode on.

MG369XA MM 3-41

Page 94

Frequency Modulation Tests Performance Verification

Step 7. Find the first Bessel null as follows:

a. Increase the function generator’s amplitude in

10 mV increments (within a range of 1.8 to

2.2 V that the MG369XA carrier level is minimized.

on the function generator display) such

p-p

b. Fine adjust the function generator in 1 mV incre

ments to achieve an absolute minimum carrier level. The Dmarker level should be at least –48 dBc at the first null.Typically,–54 dBc can be achieved.

Step 8. Record the multimeter’s reading in the test record as

null

Step 9. Calculate the following to three decimal places and

record the results in the test record:

707

GTF

max

min

100

+= -FM

-= -FM

error

707

V GTF

null

3-42 MG369XA MM

Page 95

Performance Verification Frequency Modulation Tests

LOCKED LOW-NOISE EXTERNAL FM ACCURACY AT 5 GHz

Step 10. On the MG369XA, set Locked Low-Noise External

FM mode on by pressing Mode>,then press Locked Low Noise.

Step 11. Find the first Bessel null as follows:

a. Adjust the function generator’s amplitude in

10 mV increments (within a range of 1.8 to

2.2 V that the MG369XA carrier level is minimized.

on the function generator’s display) such

p-p

b. Fine adjust the function generator in 1 mV incre

ments to achieve an absolute minimum carrier level. The Dmarker level should be at least –48 dBc at the first null.Typically,–54 dBc can be achieved.

Step 12. Record the multimeter’s reading in the test record as

null

Step 13. Calculate the following to three decimal places and

record the results in the test record:

707

GTF

max

min

100

+= -FM

-= -FM

error

707

V GTF

null

MG369XA MM 3-43

Page 96

Frequency Modulation Tests Performance Verification

LOCKED EXTERNAL FM ACCURACY AT 20 GHz

Step 14. Set up the MG369XA as follows:

Press Frequency to open the current frequency parameter for editing.

b. Set the frequency to 20 GHz, then to 2.3 GHz,

then back to 20 GHz.

Press Modulation, then press Mode> and select Locked.

Press <Previous, then press On/Off to turn locked external FM mode off.

Step 15. Set up the spectrum analyzer as follows:

Press the FREQUENCY key and enter 20 GHz.

Press the PEAK SEARCH key,then select MARKER DELTA.

Step 16.

Press On/Off to turn locked external FM mode on.

Step 17. Find the first Bessel null as follows:

a. Adjust the function generator’s amplitude in

10 mV increments (within a range of 1.8 to

2.2 V

on the function generator’s display) such

p-p

that the MG369XA carrier level is minimized.

b. Fine adjust the function generator in 1 mV incre

ments to achieve an absolute minimum carrier level. The Dmarker level should be at least –48 dBc at the first null.Typically,–54 dBc can be achieved.

Step 18. Record the multimeter’s reading in the test record as

null

Step 19. Calculate the following to three decimal places and

record the results in the test record:

707

GTF

max

min

100

+= -FM

-= -FM

error

707

V GTF

null

3-44 MG369XA MM

Page 97

Performance Verification Frequency Modulation Tests

LOCKED LOW-NOISE EXTERNAL FM ACCURACY AT 20 GHz

Step 20.

On the MG369XA, select Locked Low Noise.

Step 21. Find the first Bessel null as follows:

a. Adjust the function generator’s amplitude in

10 mV increments (within a range of 1.8 to

2.2 V

on the function generator’s display) such

p-p

that the MG369XA carrier level is minimized.

b. Fine adjust the function generator in 1 mV incre

ments to achieve an absolute minimum carrier level. The Dmarker level should be at least –48 dBc at the first null.Typically,–54 dBc can be achieved.

Step 22. Record the multimeter’s reading in the test record as

null

Step 23. Calculate the following to three decimal places and

record the results in the test record:

707

GTF

max

min

100

+= -FM

-= -FM

error

707

V GTF

null

MG369XA MM 3-45

Page 98

Frequency Modulation Tests Performance Verification

LOCKED INTERNAL FM ACCURACY AT 5 GHz (Options 12 and 23 or Option 25)

Step 24. Disconnect the function generator from the

MG369XA’s rear panel FM/FM IN connector.

Step 25. Set up the MG369XA as follows:

Reset the instrument by pressing SYSTEM,then Reset. Upon reset, the CW menu is displayed.

Press Edit F1 to open the current frequency pa rameter for editing and set F1 to 5 GHz.

Press the Modulation key, then press FM.

Press Internal/External, to select the locked inter nal FM mode and ensure that the FM mode is off.

Press Edit Rate and set it to 99.8 kHz.

Press Edit Deviation and set it to 240 kHz.

Step 26. Set up the spectrum analyzer as follows:

Press FREQUENCY and set the center frequency to 5 GHz.

Press the PEAK SEARCH key,then select MARKER DELTA.

Step 27.

On the MG369XA, press On/Off to turn the locked internal FM mode on.

Step 28. On the MG369XA, adjust the FM deviation in 1 kHz

increments (within a range of 220 to 260 kHz) such that the carrier level is minimized on the spectrum analyzer display.The Dmarker level should be at least –48 dBc at the first null. Typically, –50 to –65 dBc can be achieved.

Step 29. Record the FM deviation setting that produces the

deepest carrier null as FM

in the test record.

null

Step 30. Calculate the following to three decimal places and

record the results in the test record:

+=´

-=´

error

max

min

æ ç

ç è

ç ç

MHz

null

MHz

null

ö ÷

100

-FM GTF

÷ ø

ö ÷

100

-FM GTF

÷ ø

3-46 MG369XA MM

Page 99

Performance Verification Frequency Modulation Tests

LOCKED LOW-NOISE INTERNAL FM ACCURACY AT 5 GHz (Options 12 and 23 or Option 25)

Step 31.

On the MG369XA, press Mode> and select Locked Low Noise, then press <Previous.

Step 32. Adjust the FM deviation in 1 kHz increments

(within a range of 220 to 260 kHz) such that the carrier level is minimized on the spectrum analyzer display. The Dmarker level should be at least –48 dBc at the first null.Typically,–50 to –65 dBc can be achieved.

Step 33. Record the FM deviation setting that produces the

deepest carrier null as FM

in the test record.

null

Step 34. Calculate the following to three decimal places and

record the results in the test record:

+=´

-=´

error

max

min

æ ç

ç è

ç ç

MHz

null

MHz

null

ö ÷

100

-FM GTF

÷ ø

ö ÷

100

-FM GTF

÷ ø

MG369XA MM 3-47

Page 100

Frequency Modulation Tests Performance Verification

LOCKED INTERNAL FM ACCURACY AT 20 GHz (Options 12 and 23 or Option 25)

Step 35. Set up the MG369XA as follows:

Press Frequency and set the frequency to 20 GHz, then 2.3 GHz, then back to 20 GHz.

Press Modulation, then press Mode> and select Locked.

Press <Previous, then press On/Off to turn the FM mode off.

Step 36. Set up the spectrum analyzer as follows:

Press FREQUENCY and set the center frequency to 20 GHz.

Press the PEAK SEARCH key,then select MARKER DELTA.

Step 37.

On the MG369XA, press On/Off to turn the FM mode on.

Step 38. On the MG369XA, adjust the FM deviation in 1 kHz

Step 39. Record the FM deviation setting that produces the

deepest carrier null as FM

in the test record.

null

Step 40. Calculate the following to three decimal places and

record the results in the test record:

+=´

-=´

error

max

min

æ ç

ç è

ç ç

MHz

null

MHz

null

ö ÷

100

-FM GTF

÷ ø

ö ÷

100

-FM GTF

÷ ø

3-48 MG369XA MM

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

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

Chapter 1 General Information

Chapter 2 Functional Description

Chapter 3 Performance Verification