Anritsu 681XXC Manuel d'utilisateur

SERIES681XXCSYNTHESIZED SIGNAL GENERATOROPERATION MANUALP/N: 10370-10333REVISION: BPRINTED: APRIL 2001COPYRIGHT 1999 ANRITSU CO.490 JARVIS DRIVEMORGAN

Appendix A Rear Panel ConnectorsA-1 INTRODUCTION...A-1A-2 REAR PANEL CONNECTORS ...A-1A-3 CONNECTOR PINOUT DIAGRAMS ...A-

User Cal(User LevelFlatnessCorrection)The User Cal (user level flatness correction) func-tion lets you calibrate out path variations withfrequency tha

Equipment SetupTo create a power-offset table for user level flatnesscorrection, connect the equipment (shown in Figure3-4) as follows:Step 1 Using a

At the Configure GPIB menu, press More to go toan Additional Configure GPIB Menu (below).Press Pwr Mtr Address to change the address of thepower meter

Place the signal generator in a fixed power levelmode by pressing the main menu keyLEVEL/ALCSELECTAt the resulting menu display, press Level . The681X

range is 2 to 801.) When you have finished settingthe open number-of-points parameter, close it bypressing Edit Points or by making another menuselect

Erasing the Power-Offset Tables from MemoryThe power-offset tables are stored in non-volatilememory. A master reset is required to erase the con-tents

3-12 SIGNAL MODULATION The signal generator provides AM, FM, and square wave modulationof the output signal. All modulation modes—AM, FM, and squarewa

qSelect the input impedance (600W or 50W)ofthe input connector.qSelect the input connector (front panel or rearpanel AM IN) that is connected to the e

In Unlocked Wide mode, frequency modulation isaccomplished by applying the modulating signal tothe main tuning coil of the YIG-tuned oscillator. Un-lo

This menu contains an external FM status windowthat shows the current menu selections and themeasured FM Deviation. (The FM deviation meas-urement fun

Table of Contents (Continued)

Square WaveModulationOperatingModesThe 681XXC provides square wave (pulse) modula-tion of the output signal using modulating signalsfrom either its in

Press On/Off to turn square wave modulation onand off. Both the Square Wave status display andthe Square Wave modulation status area will reflectyour

External Source Input Connector SelectionIf you have selected External to use a modulatingsignal from an external source, then when you pressMore the

3-13 SYSTEMCONFIGURATIONThe system configuration function provides menus that let you set orselect instrument configuration items; for example, displa

Configuringthe FrontPanelConfiguring the front panel of the signal generatorinvolves adjusting the intensity level of the data dis-play for ease of vi

Configuringthe RearPanelConfiguring the rear panel of the signal generatorconsists of selecting the polarity of the retraceblanking, bandswitch blanki

Configuringthe RFConfiguring the RF of the 681XXC involves the fol-lowing:qSelecting whether the RF should be on or offduring retrace.qSelecting wheth

Additional Configure RF MenuWhen you press More , the Additional Configure RFMenu (below) is displayed.Press Reset State to select RF On or Off at res

Configuringthe GPIBThe GPIB configuration menus let you perform thefollowing:qSet the GPIB address and select the GPIB lineterminator for the signal g

Press SS Mode to place the signal generator in asource lock mode for operation with a Anritsu Model360B Vector Network Analyzer. (Refer to paragraph7-

Table of Contents1-1 SCOPE OF MANUAL...1-31-2 INTRODUCTION ...1-31-3 DESCRIPTION ...1-31-4 IDENTIFICATI

Press Native SCPI to select the external interfacelanguage to be used for remote operation of the681XXC. (Language selection is only available oninstr

SettingIncrementSizesThe Increment menu lets you set the incrementalsize for editing frequency, power level, and time pa-rameters. When the increment

3-14 SAVING/RECALLINGINSTRUMENT SETUPSThe 681XXC offers the capability to store up to ten complete frontpanel setups. The setups are numbered 0 throug

ErasingStored SetupsThe front panel setups are stored in non-volatilememory. A master reset is required to erase the con-tents of the setups and repro

3-15 SECURE OPERATION The 681XXC can be operated in a secure mode of operation. In thissecure mode, the display of all frequency, power level, and mod

3-16 REFERENCEOSCILLATORCALIBRATIONThe reference oscillator calibration function lets you calibrate theinternal 100 MHz crystal reference oscillator o

When Proceed is pressed, the date parameteropens for data entry.Using the key pad, enter the current date (in anydesired format). Then, press any temi

Table of Contents4-1 INTRODUCTION ...4-34-2 MENU MAP DESCRIPTION ...4-3Chapter 4Local Operation–Menu Maps

Chapter 4Local Operation–Menu Maps4-1 INTRODUCTION This chapter provides menu maps that support the 681XXC frontpanel operating instructions found in

Figure 1-1. Series 681XXC Synthesized Signal Generator

LOCAL OPERATION SAMPLE–MENU MAPS MENU MAPFigure 4-1. Sample Menu Map (Annotated)681XXC OM 4-5

LOCAL OPERATION CW–MENU MAPS FREQUENCY MODE4-6 681XXC OMFigure 4-2. CW Frequency Mode Menu MapNOTESRefer to Chapter 7, paragraph 7-2for Master-Slave o

LOCAL OPERATION ANALOG SWEEP–MENU MAPS FREQUENCY MODE681XXC OM 4-7Figure 4-3. Analog Sweep Frequency ModeMenu MapNOTERefer to Chapter 3, paragraph 3-8

LOCAL OPERATION STEP SWEEP–MENU MAPS FREQUENCY MODE4-8 681XXC OMFigure 4-4. Step Sweep Frequency ModeMenu MapNOTERefer to Chapter 3, paragraph 3-8for

LOCAL OPERATION MANUAL SWEEP–MENU MAPS FREQUENCY MODE681XXC OM 4-9Figure 4-5. Manual Sweep Frequency ModeMenu MapNOTERefer to Chapter 3, paragraph 3-8

4-10 681XXC OMLOCAL OPERATION LIST SWEEP–MENU MAPS FREQUENCY MODEFigure 4-6. List Sweep Frequency ModeMenu MapNOTERefer to Chapter 3, paragraph 3-8for

LOCAL OPERATION FIXED POWER–MENU MAPS LEVEL MODEFigure 4-7. Fixed Power Level Mode MenuMapNOTERefer to Chapter 3, paragraph 3-9 forFixed Power Level M

LOCAL OPERATION CW POWER–MENU MAPS SWEEP MODEFigure 4-8. CW Power Sweep Mode MenuMapNOTERefer to Chapter 3, paragraph 3-10for CW Power Sweep Mode oper

LOCAL OPERATION SWEEP FREQUENCY/–MENU MAPS STEP POWER MODEFigure 4-9. Sweep Frequency/Step PowerMode Menu MapNOTERefer to Chapter 3, paragraph 3-10 fo

Chapter 1General Information1-1 SCOPE OF MANUAL This manual provides general information, installation, and operatinginformation for the Anritsu Serie

LOCAL OPERATION LEVELING–MENU MAPS MODESSYSTEMMODULATIONCW/SWEEPSELECTFREQUENCYCONTROLLEVEL/ALCSELECTLEVELCONTROLSYSTEMMODULATIONCW/SWEEPSELECTFREQUEN

LOCAL OPERATION AMPLITUDE–MENU MAPS MODULATION MODESYSTEMCW/SWEEPSELECTFREQUENCYCONTROLLEVEL/ALCSELECTLEVELCONTROLMODULATIONAM On✱/Off600 or 50Inp

LOCAL OPERATION FREQUENCY–MENU MAPS MODULATION MODESYSTEMCW/SWEEPSELECTFREQUENCYCONTROLLEVEL/ALCSELECTLEVELCONTROLMODULATIONFM On✱/Off600 or 50Inp

LOCAL OPERATION SQUARE WAVE–MENU MAPS MODULATION MODESYSTEMMODULATIONCW/SWEEPSELEC TFR EQUENCYCONTROLLEVEL/ALCSELECTLEVELCONTROLSYSTEMMODULATIONCW/SWE

LOCAL OPERATION SYSTEM–MENU MAPS CONFIGURATIONS Y S T E MM O D U L A T I O NC W / S W E E PS E L E C TF R E Q U E N C YC O N T R O LL E V E L / A L CS

Table of Contents5-1 INTRODUCTION ...5-35-2 TEST EQUIPMENT...5-35-3 TEST RECORDS ...5-35-4 INITIAL 681X

Chapter 5Operation Verification5-1 INTRODUCTION This chapter contains three operation verification tests that can beused to verify Series 681XXC Synth

5-4 INITIAL 681XXCCHECKOUTBefore starting the operation verification tests in this chapter, performan initial checkout of the 681XXC to be tested. Thi

5-5 CW FREQUENCYACCURACY TESTThe following test verifies that the CW frequency output of the signalgenerator is within accuracy specifications. Table

1-4 681XXC OM681XXCModelFrequency Output PowerOutput Powerw/Step AttenuatorOutput Powerw/ElectronicStep Attenuator68117C 0.01 – 8.4 GHz +13.0 dBm +11.

TestProcedureThe following procedure tests both the coarse andfine loops to verify the accuracy of the CW frequencyoutput.Step 1 Set up the 681XXC as

681XXC OM 5-7Model 681__C Serial No. ____________________ Date ___________68117C 68137C / 68147C1.000 000 000* _____________________ 2.000 000 000* __

5-8 681XXC OMModel 681__C Serial No. ____________________ Date ___________68167C 68177C2.000 000 000* _____________________ 2.000 000 000* ___________

681XXC OM 5-9Model 681__C Serial No. ____________________ Date ___________68187C 68197C2.000 000 000* _____________________ 2.000 000 000* ___________

5-10 681XXC OMModel 681__C Serial No. ____________________ Date ___________* Specification for all frequencies listed above is ±100 Hz. All frequencie

681XXC OM 5-11Model 681__C Serial No. ____________________ Date ___________* Specification for all frequencies listed above is ±10 Hz. All frequencies

5-12 681XXC OMModel 681__C Serial No. ____________________ Date ___________* Specification for all frequencies listed above is ±10 Hz. All frequencies

5-6 POWER LEVELACCURACY ANDFLATNESS TESTSThese tests verify that the power level accuracy and flatness of the681XXC meet specifications. Table 5-3, be

Power LevelAccuracy TestProcedurePower level accuracy is checked by stepping thepower down in 1 dB increments from its maximumrated power level.Step 1

Power LevelFlatness TestProcedurePower level flatness is checked by measuring thepower level variation during a full band sweep; firstin the step swee

1-4 IDENTIFICATIONNUMBERAll Anritsu instruments are assigned a unique six-digit ID number,such as “875012”. The ID number is imprinted on a decal that

g. Now, return to the Step Sweep menuby pressing the main menu keyCW/SWEEPSELECTh. At the Step Sweep menu, pressSweep Ramp to go to the Step SweepRamp

Step 3 Set up the 681XXC as follows for an ana-log sweep power level flatness test:a. Reset the instrument by pressingSYSTEM , then Reset . The CWMenu

h. At the Analog Sweep menu, press themenu soft-key Sweep Ramp to go tothe Analog Sweep Ramp Menu.i.Press Sweep Time to open the sweeptime parameter f

681XXC OM 5-19Model 68117C Serial No. ____________________ Date ___________Model 68117C(without Option 2 Step Attenuator)Power Level Accuracy *(CW Fre

5-20 681XXC OMModel 68117C Serial No. ____________________ Date ___________Model 68117C(with Option 2A Step Attenuator)Power Level Accuracy *(CW Frequ

681XXC OM 5-21Model 68117C Serial No. ____________________ Date ___________Model 68117C(with Option 2E Step Attenuator)Power Level Accuracy *(CW Frequ

5-22 681XXC OMModel 68117C w/Option 15A Serial No. ____________________ Date ___________Model 68117C with Option 15A High Power(without Option 2 Step

681XXC OM 5-23Model 68117C w/Option 15A Serial No. ____________________ Date ___________Model 68117C with Option 15A High Power(with Option 2A Step At

5-24 681XXC OMModel 68117C w/Option 15A Serial No. ____________________ Date ___________Model 68117C with Option 15A High Power(with Option 2E Step At

681XXC OM 5-25Model 68137C Serial No. ____________________ Date ___________Model 68137C(without Option 2 Step Attenuator)Power Level Accuracy *(CW Fre

MaintenanceManualThe Maintenance Manual supplies service informa-tion for all models in the 681XXC series. The serviceinformation includes functional

5-26 681XXC OMModel 68137C Serial No. ____________________ Date ___________Model 68137C(with Option 2A Step Attenuator)Power Level Accuracy *(CW Frequ

681XXC OM 5-27Model 68137C Serial No. ____________________ Date ___________Model 68137C(with Option 2F Step Attenuator)Power Level Accuracy *(CW Frequ

5-28 681XXC OMModel 68137C w/Option 15A Serial No. ____________________ Date ___________Model 68137C with Option 15A High Power(without Option 2 Step

681XXC OM 5-29Model 68137C w/Option 15A Serial No. ____________________ Date ___________Model 68137C with Option 15A High Power(with Option 2A Step At

5-30 681XXC OMModel 68137C w/Option 15A Serial No. ____________________ Date ___________Model 68137C with Option 15A High Power(with Option 2F Step At

681XXC OM 5-31OPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68147C Serial No. ____________________ Date ___________Model 68147C(w

5-32 681XXC OMOPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68147C Serial No. ____________________ Date ___________Model 68147C(w

681XXC OM 5-33OPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68147C Serial No. ____________________ Date ___________Model 68147C(w

5-34 681XXC OMOPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68147C w/Option 15A Serial No. ____________________ Date ___________M

681XXC OM 5-35OPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68147C w/Option 15A Serial No. ____________________ Date ___________M

Option 14, Rack Mounting without Chassis Slides. Modifiesrack mounting hardware to install unit in a console that has mount-ing shelves. Includes moun

5-36 681XXC OMOPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68147C w/Option 15A Serial No. ____________________ Date ___________M

681XXC OM 5-37OPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68167C Serial No. ____________________ Date ___________Model 68167C(w

5-38 681XXC OMOPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68167C Serial No. ____________________ Date ___________Model 68167C(w

681XXC OM 5-39OPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68167C w/Option 15A Serial No. ____________________ Date ___________M

5-40 681XXC OMOPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68167C w/Option 15A Serial No. ____________________ Date ___________M

681XXC OM 5-41OPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68177C Serial No. ____________________ Date ___________Model 68177C(w

5-42 681XXC OMOPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68177C Serial No. ____________________ Date ___________Model 68177C(w

681XXC OM 5-43OPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68187C Serial No. ____________________ Date ___________Model 68187C(w

5-44 681XXC OMOPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68187C Serial No. ____________________ Date ___________Model 68187C(w

681XXC OM 5-45/5-46OPERATION POWER LEVEL ACCURACYVERIFICATION AND FLATNESS TESTSModel 68197C Serial No. ____________________ Date ___________Model 681

1-9 RECOMMENDED TESTEQUIPMENTTable 1-2 lists the recommended test equipment for performing the Se-ries 681XXC Synthesized Signal Generator operation v

Table of Contents6-1 INTRODUCTION ...6-36-2 ERROR AND WARNING/STATUS MESSAGES. . . 6-3Self-Test Error Messages...6-3Normal O

Chapter 6Operator Maintenance6-1 INTRODUCTION This chapter provides the information necessary for operator mainte-nance of the signal generator. Opera

6-4 681XXC OMSelf-test error messages normally indicate the failure of aninternal component or assembly of the signal generator.There are no operator

681XXC OM 6-5Error Message Description/RemarksError 111Fine Loop Osc FailedIndicates one or more of the oscillators within the fine loop is not phase-

6-6 681XXC OMError Message Description/RemarksError 1258.4 – 20 GHz Unlocked andUnleveledIndicates a failure of the 8.4 to 20 GHz YIG-tuned oscillator

681XXC OM 6-7Error Message Description/RemarksError 138SDM Unit or Driver FailedIndicates a failure of the switched doubler module (SDM) or SDM bias r

NormalOperationError andWarning/StatusMessagesWhen an abnormal condition is detected during op-eration, the 681XXC displays an error message toindicat

681XXC OM 6-9Warning/StatusMessageDescriptionOVN COLDThis warning message indicates that the 100 MHzCrystal oven (or the 10 MHz Crystal oven if Option

6-3 TROUBLESHOOTING Table 6-4 provides procedures for troubleshooting common malfunc-tions encountered during operation of the signal generator. Inclu

WARRANTYThe Anritsu product(s) listed on the title page is (are) warranted against defects in materials andworkmanship for one year from the date of s

Table of Contents2-1 INTRODUCTION ...2-32-2 INITIAL INSPECTION...2-32-3 PREPARATION FOR USE ...2-4Power Requir

681XXC OM 6-11Signal Generator Quits During Operation(OPERATE light remains on)Trouble Description: The signal generator operates for some time,then s

6-12 681XXC OMUNLEVELED is DisplayedTrouble Description: This message is displayed to indicate that theRF output is unleveled.Step 1 Check that the ou

6-4 ROUTINE MAINTENANCE Routine maintenance that can be performed by the operator consistsof cleaning the fan filter, cleaning the data display, and r

free cloth. Do not use abrasive cleaners, tissues, orpaper towels which can scratch the plastic surface.Replacing theLine FuseThe value of the line fu

Step 3 Replace the fuse in the fuse holder.Step 4 Install the fuse holder in the rear panel.Using the screwdriver, rotate the fuse capclockwise to sec

Table of Contents7-1 INTRODUCTION ...7-37-2 MASTER-SLAVE OPERATION ...7-4Connecting the Instruments ...7-4Initiating M

Chapter 7Use With Other Instruments7-1 INTRODUCTION This chapter provides information and instructions for using the Se-ries 681XXC Synthesized Signal

7-2 MASTER-SLAVEOPERATIONMaster-slave operation consists of connecting any two 68XXXC and/or68XXXB instruments together and configuring them so that t

Step 4 Connect the Master instrument RF OUT-PUT and the Slave instrument RF OUT-PUT to the appropriate connections on theDUT.InitiatingMaster-SlaveOpe

This menu lets you edit the listed frequencies forthe Slave instrument.Use the cursor control key to select a frequency pa-rameter from the list, then

pad and appropriate termination key. When youhave finished setting the open parameter, close it bypressing its menu soft-key or by making anothermenu

Press VNA Menu to go to the VNAMenu display(below).This menu lets you set the frequency offset and out-put power level for the Slave instrument in the

TerminatingMaster-SlaveOperationThe following describes how to terminate master-slave operation and return the Slave instrument tolocal (front panel)

7-3 USE WITH A 56100ASCALAR NETWORKANALYZERThe 681XXC is directly compatible with the Anritsu Model 56100AScalar Network Analyzer (SNA). The following

7-4 USE WITH A 360BVECTOR NETWORKANALYZERThe 681XXC signal generator is compatible with the Anritsu Model360B Vector Network Analyzer (VNA). The follo

If the 681XXC contains an Option 16high-stability time base, connect the coax-ial cable between the 681XXC rear panel10 MHz REF OUT connector and the

At the System Configuration menu, press GPIB .The Configure GPIB Menu (below) is displayed.Verify that the GPIB address and terminator shownon the dis

Terminating 360B Source Lock Mode Opera-tionsTo terminate 360B VNA source lock mode opera-tions, you must first return the 681XXC to local con-trol an

If the address of the 681XXC on the System Busneeds changing, press GPIB Address . Enter thenew address using the cursor control key or the dataentry

Chapter 2Installation2-1 INTRODUCTION This chapter provides installation instructions for the Series 681XXCSynthesized Signal Generator. It includes i

7-5 USE WITH A HP8757DSCALAR NETWORKANALYZERThe 681XXC signal generator is compatible with the Hewlett Packard8757D Scalar Network Analyzer (SNA). The

Step 3 Connect the special AUX I/O interfacecable (Anritsu Part No. 806-90) to the681XXC rear panel AUX I/O connector.Connect the cable end having BNC

Press GPIB Address to change the address of the681XXC on the bus. Enter 19 using the cursor con-trol key or the data entry keypad and the termina-tor

InitiatingHP8757DSNAOperationTurn ON the HP8757D to initiate scalar networkanalyzer operation. (Refer to the Hewlett PackardModel 8757D Scalar Network

Appendix ARear Panel ConnectorsA-1 INTRODUCTION This appendix provides descriptions for the rear panel connectors on atypical Series 681XXC Synthesize

A-2 681XXC OMREAR PANELCONNECTORSI N1 0 M H zR E FO U TE X TA L CI NF MI NA MI NH O R I ZO U T1 0 M H zR E F I NS E R I A LI / OA U X I / ON O

681XXC OM A-3AUX I/O: 25-pin connector that provides for single cable interface with another 68XXXB/C (master-slaveoperation) and with other Anritsu i

A-4 681XXC OMPIN SIGNAL NAME SIGNAL DESCRIPTION1 HORIZ OUTPUTHorizontal Sweep Output: Provides a 0V at beginning and +10V at end of sweepfor all sweep

681XXC OM A-5PIN SIGNAL NAME SIGNAL DESCRIPTION14 V/GHzV/GHz Output: Provides a reference voltage relative to the RF output frequency(1.0 V/GHz for Mo

A-6 681XXC OMIEEE-488 GPIB13 14 15 16 17 18 19 20 21 22 23 2412345678910 11 12PIN SIGNAL NAME SIGNAL DESCRIPTION1-4 DIO 1 thru DIO 4Data Input/Output:

2-3 PREPARATION FOR USE Preparation for use consists of checking that the rear panel line volt-age selector switch is set for the correct line voltage

Appendix BPerformance SpecificationsFREQUENCYCW MODEOutput: Twenty independent, presettable CW frequencies(F0 – F9 and M0 – M9).Accuracy: Same as inte

360B VNA SOURCE LOCK MODEUnder control of the Anritsu 360B Vector Network Ana-lyzer, the synthesized signal generator is phase-locked at atypical <

SINGLE-SIDEBAND PHASE NOISE (dBc/Hz)POWER LINE and FAN ROTATION SPURIOUS EMISSIONS (dBc)RESIDUAL FM (CW and Step Sweep modes, 50 Hz - 15 kHz BW)RESIDU

RF OUTPUTPower level specifications apply at 25°±10°C.MAXIMUM LEVELED OUTPUT POWERPERFORMANCESPECIFICATIONSNote: In models with Option 22 that have a

LEVELED OUTPUT POWER RANGEStandard UnitsWithout an Attenuator: Maximum leveled power to–15 dBm (–20 dBm typical).With an Attenuator: Maximum leveled p

User Level Flatness Correction:Number of points: 2 to 801 points per tableNumber of tables: 5 availableEntry modes: GPIB power meter or computed dataC

REMOTE OPERATIONAll instrument functions, settings, and operating modes(except for power on/standby) are controllable using com-mands sent from an ext

Warm Up Time:From Standby: 30 minutes.From Cold Start (0°C): 120 hours to achieve specifiedfrequency stabiltiy with aging.Instruments disconnected fro

AUX I/O (Auxiliary Input/Output): Provides for most ofthe rear panel BNC connections through a single, 25-pin,D-type connector. Supports master-slave

Subject IndexNumber681XXCFront Panel Layout, 3-6General Description, 1-3Manual, Electronic, 1-5Manuals, Related, 1-5Models, List of, 1-4Options, List

StandbyOperationWhenever the signal generator is not being used itshould be left connected to the power source andplaced in standby. This keeps the in

LLeveling OperationsALC Power Slope, 3-65Attenuator Decoupling, 3-64External Leveling, 3-61Fixed Gain, 3-63Internal Leveling, 3-61Menu Map, 4-14Select

Operating Modes, 3-77Providing Square Wave Modulation, 3-77SS Mode Operation, 7-12Start Up, 3-14Start-Up Display, 3-14Step Sweep Frequency ModeMenu Ma

Warmup TimeFrom Standby–When placing the 681XXC in op-eration from stand-by, allow 30 minutes warmup toassure stable operation.From a Cold Start (0°C)

2-4 GPIB SETUP ANDINTERCONNECTIONThe 681XXC provides automated microwave signal generation via theGPIB. The following paragraphs provide information a

Now press the menu soft-key Config . The SystemConfiguration Menu (below) is displayed.To go to the Configure GPIB menu from this menu,press the menu

Selecting theLineTerminatorData is delimited on the GPIB by either the carriagereturn (CR) ASCII character or both the carriage re-turn and line feed

2-5 RACK MOUNTING KITINSTALLATIONThe rack mounting kit (Option 1) contains a set of track slides (90° tiltcapability), mounting ears, and front panel

Step 4 Remove the inner slide assemblies fromthe outer slide assemblies.Step 5 Place the left side inner slide assemblyonto the instrument case with t

Step 10 Place the right side inner slide assemblyonto the instrument case with the handletowards the front of the instrument.Step 11 Insert two green-

2-6 PREPARATION FORSTORAGE/SHIPMENTThe following paragraphs give instructions for preparing the 681XXCfor storage or shipment.Preparationfor StoragePr

2-14 681XXC OMANRITSUINSTALLATION SERVICE CENTERSUNITED STATESANRITSU COMPANY490 Jarvis DriveMorgan Hill, CA 95037-2809Telephone: (408) 776-83001-800-

Table of Contents3-1 INTRODUCTION ...3-53-2 FRONT PANEL LAYOUT...3-6Line Key ...3-6Data Display Area ...

3-7 CW FREQUENCY OPERATION ...3-21Selecting CW Mode...3-21Selecting a CW Frequency ...3-22Selecting a Power Level...

3-11 LEVELING OPERATIONS ...3-60Selecting a Leveling Mode ...3-60Attenuator Decoupling ...3-64ALC Power Slope...

Chapter 3Local (Front Panel) Operation3-1 INTRODUCTION This chapter provides information and instructions on operating theSeries 681XXC Synthesized Si

3-2 FRONT PANEL LAYOUT The 681XXC front panel is divided into two main areas—the data dis-play area and the data entry area. The following paragraphs

Safety SymbolsTo prevent the risk of personal injury or loss related to equipment malfunction, Anritsu Company uses thefollowing symbols to indicate s

Data EntryAreaThe data entry area consists of data entry keys andcontrols that provide for (1) changing values foreach 681XXC parameter, and (2) termi

3-3 DATA DISPLAY AREA The data display area consists of the data display and the surroundingmenu keys. The data display is a dot matrix liquid crystal

Menu DisplayFormatThe menu display is divided into specific areas thatshow the frequency, power level, and modulation in-formation for the current sig

most cases, when a menu soft-key is pressed, itsmenu label changes appearance to visually show theOn/Off condition.Window DisplayA window display that

sweep. In the Level Sweep mode, this menulets you select the power sweep range parame-ters to use.qMODULATION—This menu provides youwith access to sub

3-4 DATA ENTRY AREA The value of a selected 681XXC parameter can be changed using therotary data knob and/or keys of the data entry area. Each element

Rotary Data KnobThe rotary data knob can be used to change thevalue of a parameter that is open for editing. Thecursor is moved under the open paramet

3-5 INSTRUMENT START-UP Now that you have familiarized yourself with the layout of the signalgenerator’s front panel controls and data display, you ar

Self-Testingthe 681XXCThe 681XXC firmware includes internal diagnosticsthat self-test the instrument. These self-test diag-nostics perform a brief go/

3-16 681XXC OMTable 3-1. Reset (Default) Paramenters (1 of 2)681XXCMODELNUMBERFREQUENCY PARAMETERS (GHz)F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 M0 M1 M2 M3 M4 M

Safety-2 681XXC OMThere are no operator serviceable components inside. Referservicing of the instrument to qualified service technicians.To prevent th

681XXC OM 3-17LOCAL (FRONT RESET (DEFAULT)PANEL) OPERATION PARAMETERSTable 3-1. Reset (Default) Paramenters (2 of 2)681XXCMODELNUMBERSWEEPTIMESTEP SWE

3-6 ENTERING DATA Before proceeding to the various modes of signal generator operation,you need to know how to enter data from the front panel. Enteri

Editing theCurrent ValueTo change the current value of a parameter by edit-ing, you can use either the cursor control key or therotary data knob.Using

Entering aNew ValueTo change the current value of a parameter by en-tering a new value for the parameter, use the dataentry keypad and termination key

3-7 CW FREQUENCYOPERATIONOne of the signal generator’s major functions is to produce discreteCW frequencies across the frequency range of the instrume

Selecting aCWFrequencyThere are several ways to select a CW frequency foroutput. You can (1) edit the current frequency, (2)enter a new frequency, or

Frequency List–To go to the Frequency List Menu(below), press Freqs List . This menu lets you tag,edit, or output a frequency from the list.Use the cu

Scanning Tagged Frequencies–TogototheTagged Frequencies Menu (below) from the CW Fre-quency Control menu, press Tag Freq Menu .This menu lets you sele

CW Ramp When active, the signal generator’s CW ramp pro-vides a repetitive 0V to 10V ramp output to the rearpanel HORIZ OUT BNC connector and AUX I/O

3-8 SWEEP FREQUENCYOPERATIONThe signal generator can generate broad (full range) and narrow bandsweeps across the frequency range of the instrument. T

Table of ContentsChapter 1 General Information1-1 SCOPE OF MANUAL...1-31-2 INTRODUCTION ...1-31-3 DESCRIPTION ...

This menu lets you perform the following:qSelect a sweep range (edit the sweep start andstop frequency parameters).qGo to the sweep ramp menu (set the

Selecting aSweepTriggerThere are three modes of sweep triggering providedfor analog sweep and step sweep—automatic, exter-nal, and single. The sweep t

Step SweepModeIn step sweep frequency mode, the output frequencychanges in discrete, synthesized steps betweenselected start and stop frequencies. Ste

The step size range is 1 kHz (0.1 Hz with Option 11)to the full frequency range of the signal generator;the number of steps range is 1 to 10,000. If t

Open the parameter you wish to change, then editthe current value using the cursor control key or therotary data knob or enter a new value using the k

ManualSweep ModeIn manual sweep frequency mode, the output fre-quency can be manually tuned in phase-locked stepsbetween the selected start and stop f

Selecting aSweep RangeSelecting a sweep range involves choosing a startand a stop frequency for the frequency sweep. Thesweep range selection process

Selecting a Preset Sweep RangeThere are four preset sweep range parameters, se-lectable in the analog sweep, step sweep, and man-ual sweep frequency m

Setting a Preset Sweep Range–At the menu, se-lect the sweep range (F1-F2, F3-F4, F5-dF,orF6-dF)that you wish to set. The menu then displays thecurrent

FrequencyMarkersThe signal generator provides up to 20 independent,pre-settable markers, F0-F9 and M0-M9, that canbe used in the analog and step sweep

2-6 PREPARATION FOR STORAGE/SHIPMENT . . . 2-13Preparation for Storage...2-13Preparation for Shipment...2-13Chapter 3 Local (Front

Use the cursor control key to select a frequencyparameter from the marker list. The selected fre-quency parameter is highlighted in reverse videoand d

SelectingAlternateSweep ModeIn alternate sweep frequency mode, the signal gen-erator’s output frequency sweeps alternately be-tween any two sweep rang

Now, press Previous Menu to return to the StepSweep Menu display (or the Analog Sweep Menudisplay if operating in analog sweep frequencymode).Notice t

When you are done selecting the alternate sweeprange, press Previous Menu to return to the Alter-nate Sweep Menu display.Selecting an Alternate Sweep

List SweepModeIn list sweep frequency mode, the output is a stepsweep of up to 2000 phase-locked, non-sequentialfrequencies. Each frequency can have a

Selecting ListSweep ModeTo place the 681XXC in list sweep frequency mode,press the main menu keyCW/SWEEPSELECTAt the reulting menu display, press List

Performing List CalculationsThe PreCalc List soft-key initiates a process thatexamines every index in the list and performs allthe calculations necess

List Frequency Edit–to go to the List FrequencyEdit Menu (below), press Edit Freq . This menu letsyou scroll through the list frequencies and edit se-

Press Edit to edit the highlighted power level or en-ter a new power level.Press Page Up to scroll the displayed power levelsto the next 10 in the lis

Copying Data from the CW MenuAn easy method of entering frequency and powerlevel information into the current list index is tocopy the data from the C

Frequency Modulation Operating Modes ...3-74Providing Frequency Modulation ...3-75Square Wave Modulation Operating Modes . . . 3-77Providing Squ

Press Start Index to open the list sweep start indexparameter.Press Stop Index to open the list sweep stop indexparameter.Press Dwell Time to open the

To go to the List Sweep Trigger Menu (below) fromthe Sweep menu, press Trigger .To select a sweep trigger mode, press its menu soft-key. A message sho

3-9 FIXED POWER LEVELOPERATIONThe signal generator provides leveled output power over a maximumrange of up to 33 dB (up to 149 dB with Option 2) for C

and appropriate terminator key. To close the openpower level parameter, press Edit L1 or make an-other menu selection.Selecting a Preset Power LevelTo

Use the cursor control key to select a power levelfrom the level list. The selected power level is high-lighted in reverse video and displayed in full

Level Offset Level offset lets you compensate for a device on thesignal generator’s output that alters the RF outputpower level at the point of intere

3-10 POWER LEVEL SWEEPOPERATIONThe signal generator provides leveled output power sweeps at CW fre-quencies and in conjunction with frequency sweeps (

Setting CWPower SweepStep Size andDwell TimeThere are two ways to set the size of each step of theCW power sweep—set the step size or set thenumber of

Selecting aCW PowerSweepTriggerThere are three modes of triggering provided for theCW power sweep—automatic, external, and single.The sweep trigger is

Selecting aPower LevelSweep RangeSelecting a power level sweep range consists ofchoosing a start and stop level for the power levelsweep. The power le

Power Level Accuracy Test Procedure ...5-14Power Level Flatness Test Procedure ...5-15Chapter 6 Operator Maintenance6-1 INTRODUCTION ...

Selecting a Preset Power Level Sweep RangeThere are five preset power level sweep range pa-rameters selectable in the power level sweep modes.These pr

Selecting aSweep Fre-quency/StepPower ModeIn analog sweep frequency/step power mode or stepsweep frequency/step power mode, a power levelstep occurs a

Setting PowerLevel StepSizeThere are two ways to set the step size of the powerlevel step that occurs after each frequency sweep—set the step size or

3-11 LEVELINGOPERATIONSThe 681XXC generates leveled output power over a maximum range ofup to 33 dB (up to 149 dB with Option 2). Instruments with Opt

The ALC Mode menu lets you perform the following:qGo to the leveling menu (select the ALC modeof operation).qGo to the attenuation menu (decouple thea

Before going to the Leveling Menu from the ALCMode menu, select whether the external ALC signalis to be connected to the front- or rear-panel EXTALC I

At the Leveling menu, pressing either Internal orFixed Gain will turn off external leveling.Press Previous Menu to return to the ALC ModeMenu display.

AttenuatorDecouplingIn 681XXCs equipped with option 2 step attenua-tors, the ALC and attenuator work in conjunction toprovide leveled output power dow

ALC PowerSlopeThe ALC power slope function lets you compensatefor system, cable, and waveguide variations due tochanges in frequency, by linearly incr

Press Slope On/Off to activate the ALC power slopefunction.Press Edit Pivot to open the pivot point frequencyparameter for editing. Edit the current f