Anritsu 681XXC User Manual

SERIES 681XXC

SYNTHESIZED SIGNAL GENERATOR

OPERATION MANUAL

490 JARVIS DRIVE MORGAN HILL, CA 95037-2809

P/N: 10370-10333

REVISION: B

PRINTED: APRIL 2001

WARRANTY

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

Anritsu’s obligation covers repairing or replacing products which prove to be defective during the warranty period. Buyers shall prepay transportation charges for equipment returned toAnritsu for warranty repairs. Obligation is limited to the original purchaser. Anritsu is not liable for conse quential 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 resultingfrom improper or inadequate maintenance by the Buyer, unauthorized modification or misuse, or operation outside of the environmental specifications of theproduct. No other warranty isexpressed or implied,and the remediesprovided herein are the Buyer’s sole and exclusive remedies.

TRADEMARK ACKNOWLEDGEMENTS

Adobe Acrobat is a registered trademark of Adobe Systems Incorporated.

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 computor 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 informationis prohibited; they shallnot be reproduced,copied, or used inwhole or inpart as the basis for manufacture or sale of the equipment or software programs without the prior writt ten consent of Anritsu Company.

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 the information carefully BEFORE operating the equipment.

WARNING WARNING indicates a hazard. It calls attention to a procedure that

could result in personal injury or loss of life if not performed properly. Do not proceed beyond a WARNING notice until the indicated condi tions are fully understood and met.

CAUTION CAUTION indicates a hazard. It calls attention to a procedure which,

if not performed properly, could result in damage to or destruction of a component of the instrument. Do not proceed beyond a CAUTION note until the indicated conditions are fully understood and met.

The instrument is marked with this symbol to indicate that it is necessary for the user to refer to the instructions in the operation manual.

Indicates ground.

Indicates heavy weight equipment.

681XXC OM Safety-1

For Safety

WARNING

When supplying power to this equipment, always use a three-wire power cable connected to a three-wire power line outlet. If power is supplied without grounding the equip ment in this manner, there is a risk of receiving a severe or fatal electric shock.

WARNING

Before changing the fuse, always remove the power cord from the power outlet. There is the risk of receiving a fatal electric shock if the fuse is replaced with the power cord connected.

Always use a new fuse of the type and rating specified by the fuse markings on the rear panel of the instrument.

WARNING

There are no operator serviceable components inside. Refer servicing of the instrument to qualified service technicians.

To prevent the risk of electrical shock or damage to precision components, do not remove the equipment covers.

WARNING

Use two or more people to lift and move this equipment, or use an equipment cart. There is a risk of back injury, if this equipment is lifted by one person.

WARNING

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

Safety-2 681XXC OM

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 ELECTRONIC MANUAL...............1-5

1-6 RELATED MANUALS ................1-5

GPIB Programming Manual ...........1-5

SCPI Programming Manual ...........1-5

Maintenance Manual ..............1-6

1-7 OPTIONS .......................1-6

1-8 PERFORMANCE SPECIFICATIONS ........1-7

1-9 RECOMMENDED TEST EQUIPMENT .......1-8

Chapter 2 Installation

2-1 INTRODUCTION ...................2-3

2-2 INITIAL INSPECTION ................2-3

2-3 PREPARATION FOR USE ..............2-4

Power Requirements...............2-4

Line Voltage Selection ..............2-4

Power Connection ................2-4

Standby Operation................2-5

Warmup Time ..................2-6

Operating Environment .............2-6

2-4 GPIB SETUP AND INTERCONNECTION .....2-7

Interface Connector ...............2-7

Cable Length Restrictions ............2-7

GPIB Interconnection ..............2-7

Setting the GPIB Address ............2-7

Selecting the Line Terminator ..........2-9

Selecting the Interface Language.........2-9

2-5 RACK MOUNTING KIT INSTALLATION .....2-10

Preliminary ..................2-10

Procedure ...................2-10

681XXC OM i

Table of Contents (Continued)

2-6 PREPARATION FOR STORAGE/SHIPMENT . . . 2-13

Preparation for Storage.............2-13

Preparation for Shipment............2-13

Chapter 3 Local (Front Panel) Operation

3-1 INTRODUCTION ...................3-5

3-2 FRONT PANEL LAYOUT...............3-6

Line Key ....................3-6

Data Display Area ................3-6

Data Entry Area.................3-7

RF Output Control Key .............3-7

Connectors ...................3-7

3-3 DATA DISPLAY AREA ................3-8

Menu Display Format ..............3-9

Menu Keys ...................3-10

3-4 DATA ENTRY AREA.................3-12

3-5 INSTRUMENT START-UP .............3-14

Powering Up the 681XXC............3-14

Start-Up Display ................3-14

Standby Operation ...............3-14

Self-Testing the 681XXC ............3-15

Resetting to Default Parameters ........3-15

3-10 POWER LEVEL SWEEP OPERATION.......3-53

Selecting CW Power Sweep Mode ........3-53

Setting CW Power Sweep Step Size and Dwell Time3-54

Selecting a CW Power Sweep Trigger ......3-55

Selecting a Power Level Sweep Range......3-56

Selecting a Sweep Frequency/Step Power Mode . 3-58

Setting Power Level Step Size .........3-59

3-11 LEVELING OPERATIONS .............3-60

Selecting a Leveling Mode ...........3-60

Attenuator Decoupling .............3-64

ALC Power Slope................3-65

User Cal (User Level Flatness Correction) . . . 3-67

3-12 SIGNAL MODULATION ..............3-73

Amplitude Modulation Operating Modes ....3-73

Providing Amplitude Modulation ........3-73

ii 681XXC OM

Table of Contents (Continued)

Frequency Modulation Operating Modes ....3-74

Providing Frequency Modulation ........3-75

Square Wave Modulation Operating Modes . . . 3-77

Providing Square Wave Modulation .......3-77

3-13 SYSTEM CONFIGURATION ............3-80

Configuring the Front Panel ..........3-81

Configuring the Rear Panel...........3-82

Configuring the RF ...............3-83

Configuring the GPIB .............3-85

Setting Increment Sizes ............3-88

3-14 SAVING/RECALLING INSTRUMENT SETUPS . 3-89

Saving Setups .................3-89

Recalling Setups ................3-89

Erasing Stored Setups .............3-90

3-15 SECURE OPERATION ...............3-91

3-16 REFERENCE OSCILLATOR CALIBRATION . . . 3-92

Chapter 4 Local Operation–Menu Maps

4-1 INTRODUCTION ...................4-3

4-2 MENU MAP DESCRIPTION .............4-3

Chapter 5 Operation Verification

5-1 INTRODUCTION ...................5-3

5-2 TEST EQUIPMENT..................5-3

5-3 TEST RECORDS ...................5-3

5-4 INITIAL 681XXC CHECKOUT............5-4

Power Up ....................5-4

Self Test.....................5-4

Resetting the 681XXC ..............5-4

Warmup Time ..................5-4

5-5 CW FREQUENCY ACCURACY TEST........5-5

Test Setup....................5-5

Test Procedure..................5-6

5-6 POWER LEVEL ACCURACY AND FLATNESS

TESTS ........................5-13

Test Setup ...................5-13

681XXC OM iii

Table of Contents (Continued)

Power Level Accuracy Test Procedure ......5-14

Power Level Flatness Test Procedure ......5-15

Chapter 6 Operator Maintenance

6-1 INTRODUCTION ...................6-3

6-2 ERROR AND WARNING/STATUS MESSAGES. . . 6-3

Self-Test Error Messages.............6-3

Normal Operation Error and Warning/ Status

Messages ....................6-8

6-3 TROUBLESHOOTING ...............6-10

6-4 ROUTINE MAINTENANCE ............6-13

Cleaning the Fan Filter.............6-13

Cleaning the Data Display ...........6-13

Replacing the Line Fuse ............6-14

Chapter 7 Use With Other Instruments

7-1 INTRODUCTION ...................7-3

7-2 MASTER-SLAVE OPERATION ...........7-4

Connecting the Instruments ...........7-4

Initiating Master-Slave Operation ........7-5

Master-Slave Operation .............7-7

Master-Slave Operation in VNA Mode ......7-7

Terminating Master-Slave Operation .......7-9

7-3 USE WITH A 56100ASCALAR NETWORK

ANALYZER......................7-10

Connecting the 681XXC to the 56100A .....7-10

7-4 USE WITH A 360B VECTOR NETWORK

ANALYZER......................7-11

Connecting the 681XXC to the 360B ......7-11

Modes of Operation...............7-12

Source Lock Mode ...............7-12

Tracking Mode .................7-14

7-5 USE WITH A HP8757D SCALAR NETWORK

ANALYZER......................7-16

Connecting the 681XXC to the HP8757D ....7-16

Setting Up the 681XXC.............7-17

Initiating HP8757D SNA Operation.......7-19

iv 681XXC OM

Table of Contents (Continued)

Appendix A Rear Panel Connectors

A-1 INTRODUCTION...................A-1

A-2 REAR PANEL CONNECTORS ...........A-1

A-3 CONNECTOR PINOUT DIAGRAMS ........A-1

Appendix B Performance Specifications

681XXC OM v/vi

Table of Contents (Continued)

Chapter 1 General Information

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 ELECTRONIC MANUAL...............1-5

1-6 RELATED MANUALS ................1-5

GPIB Programming Manual ...........1-5

SCPI Programming Manual ...........1-5

Maintenance Manual ..............1-6

1-7 OPTIONS .......................1-6

1-8 PERFORMANCE SPECIFICATIONS ........1-7

1-9 RECOMMENDED TEST EQUIPMENT .......1-7

Figure 1-1. Series 681XXC Synthesized Signal Generator

Chapter 1 General Information

1-1 SCOPE OF MANUAL This manual provides general information, installation, and operating

information for the Anritsu Series 681XXC Synthesized Signal Gen erator. (Throughout this manual, the terms 681XXC and signal gen erator will be used interchangeably to refer to the instrument.) Man ual organization is shown in the table of contents.

1-2 INTRODUCTION This chapter contains general information about the series 681XXC

signal generators. It includes a general description of the instrument and information on its identification number, related manuals, op tions, and performance specifications. Alisting of recommended test equipment is also provided.

1-3 DESCRIPTION The Series 681XXC Synthesized Signal Generators are microproces-

sor-based, synthesized signal sources with high resolution phase-lock capability. They generate both broad (full range) and narrow band sweeps and discrete CW frequencies across the frequency range of 10 MHz to 65 GHz. All functions of the signal 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).

The series presently consists of seven models covering a variety of fre quency and power ranges. Table 1-1, page 1-4, lists models, frequency ranges, and maximum leveled output.

681XXC OM 1-3

GENERAL 681XXC INFORMATION MODELS

Table 1-1. Series 681XXC Models

681XXC

Model

68117C 0.01 – 8.4 GHz +13.0 dBm +11.0dBm +9.0 dBm 68137C 2.0 – 20.0 GHz +13.0 dBm +11.0 dBm +3.0 dBm 68147C 0.01 – 20.0 GHz +13.0 dBm +11.0 dBm +3.0 dBm

68167C

68177C

68187C

68197C

Frequency Output Power

0.01 – 2.0 GHz

2.0 – 20.0 GHz

20.0 – 40.0 GHz

0.01 – 2.0 GHz

2.0 – 20.0 GHz

20.0 – 40.0 GHz

40.0 – 50.0 GHz

0.01 – 2.0 GHz

2.0 – 20.0 GHz

20.0 – 40.0 GHz

40.0 – 50.0 GHz

50.0 – 60.0 GHz

0.01 – 2.0 GHz

2.0 – 20.0 GHz

20.0 – 40.0 GHz

40.0 – 50.0 GHz

50.0 — 65.0 GHz

+13.0 dBm

+9.0 dBm +6.0 dBm

+11.0dBm +10.0 dBm

+2.5 dBm +2.5 dBm

+11.0dBm +10.0 dBm

+2.5 dBm +2.0 dBm +2.0 dBm

+11.0dBm +10.0 dBm

+2.5 dBm

0.0 dBm

–2.0 dBm

With Option 15A (High Power) Installed

Output Power

w/Step Attenuator

+11.0dBm +7.0 dBm +3.0 dBm

+10.0 dBm

+8.5 dBm

0.0 dBm

–1.0 dBm

+10.0 dBm

+8.5 dBm

0.0 dBm –1.5 dBm –2.0 dBm

Not Available Not Available

Output Power

w/Electronic

Step Attenuator

Not Available

68117C 68137C 2.0 – 20.0 GHz +17.0 dBm +15.0 dBm +7.0 dBm 68147C

68167C 68177C 0.01 – 50.0 GHz Standard Standard Not Available

68187C 0.01 – 60.0 GHz Standard Standard Not Available

Note: In models with Option 22 that have a high-end frequency of £20 GHz, rated output power is reduced by 1 dB

In models with Option 22 that have a high-end frequency of >20 GHz, rated output power is reduced by 2 dB.

0.01 – 2.0 GHz

2.0 – 8.4 GHz

0.01 – 2.0 GHz

2.0 – 20.0 GHz

0.01 – 20.0 GHz

20.0 – 40.0 GHz

+13.0 dBm +17.0 dBm

+13.0 dBm

+6.0 dBm

+11.0dBm +15.0 dBm

+11.0dBm

+3.0 dBm

Not Available

+11.0dBm +11.0dBm

+11.0dBm

+7.0 dBm

1-4 681XXC OM

GENERAL IDENTIFICATION INFORMATION 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 serial number tag attached to the rear panel of the unit.

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 68147C Synthesized Signal Gen erator, Serial No. 875012).

1-5 ELECTRONIC 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 displayed “bookmark” list and “jump” to the manual page on which the topic resides. The text can also be word-searched. Contact Anritsu Customer Service for price and availability.

1-6 RELATED MANUALS This is one of a four manual set that consists of an Operation Manual,

a GPIB Programming Manual, a SCPI Programming Manual, and a Maintenance Manual.

GPIB Programming Manual

SCPI Pro gramming Manual

This manual provides information for remote operation of the signal generator with 681XXC Product Specific commands sent from an external controller via the IEEE 488 General Purpose Interface Bus (GPIB). It contains a general description of the GPIB and bus data transfer and control functions, a complete listing and description of all 681XXC GPIB Product Specific commands, and several program ming examples. The Anritsu part number for the GPIB Programming Manual is 10370-10334.

This manual provides information for remote opera tion of the signal generator with Standard Com mands for Programmable Instruments (SCPI) commands sent from an external controller via the IEEE 488 General Purpose Interface Bus (GPIB). It contains a general description of the GPIB and bus data transfer and control functions, a complete list ing and description of each command in the 681XXC SCPI command set, and examples of command us age. The Anritsu part number for the SCPI Pro gramming Manual is 10370-10335.

681XXC OM 1-5

GENERAL INFORMATION OPTIONS

Maintenance Manual

The Maintenance Manual supplies service informa tion for all models in the 681XXC series. The service information includes functional circuit descriptions, block diagrams, performance verification tests, cali bration procedures, troubleshooting data, and as sembly and component removal/replacement procedures. The Anritsu part number for the Main tenance Manual is 10370-10336.

1-7 OPTIONS The following options are available.

Option 1, Rack Mounting. Rack mount kit containing a set of track slides (90° tilt capability), mounting ears, and front panel han dles for mounting the instrument in a standard 19-inch equipment rack.

Option 2A, 110 dB Step Attenuator. Adds a 10 dB per step attenuator with a 110 dB range for models having a high-end frequency of £20 GHz. Output power is selected directly in dBm on the front panel (or via GPIB). Rated RF output power is reduced.

Option 2B, 110 dB Step Attenuator. Adds a 10 dB per step attenuator with a 110 dB range for models having a high-end frequency of £40 GHz. Output power is selected directly in dBm on the front panel (or via GPIB). Rated RF output power is reduced.

Option 2C, 90 dB Step Attenuator. Adds a 10 dB per step attenuator with a 90 dB range for models having a high-end frequency of £50 GHz. Output power is selected directly in dBm on the front panel (or via GPIB). Rated RF output power is reduced.

Option 2D, 90 dB Step Attenuator. Adds a 10 dB per step attenuator with a 90 dB range for models having a high-end fre quency of £60 GHz. Output power is selected directly in dBm on the front panel (or via GPIB). Rated RF output power is reduced.

Option 2E, 120 dB Electronic Step Attenuator. Addsa10dB per step electronic attenuator with a 120 dB range for models hav ing a high-end frequency of £8.4 GHz. Output power is selected di rectly in dBm on the front panel (or via GPIB). Rated RF output power is reduced.

Option 2F, 120 dB Electronic Step Attenuator. Addsa10dB per step electronic attenuator with a 120 dB range for models hav ing a high-end frequency of £20 GHz. Output power is selected di rectly in dBm on the front panel (or via GPIB). Rated RF output power is reduced.

Option 9, Rear Panel RF Output. Moves the RF output connector to the rear panel.

Option 11, 0.1 Hz Frequency Resolution. Provides frequency resolution of 0.1 Hz.

1-6 681XXC OM

GENERAL PERFORMANCE INFORMATION SPECIFICATIONS

Option 14, Rack Mounting without Chassis Slides. Modifies rack mounting hardware to install unit in a console that has mount ing shelves. Includes mounting ears and front panel handles.

Option 15A, High Power Output. Adds high-power RF compo nents to the instrument providing increased RF output power in the 2–20 GHz frequency range. Option 15A is standard in models hav ing a high-end frequency that is >40 GHz.

Option 16, High-Stability Time Base. Adds an ovenized, 10 MHz crystal oscillator with <5 x 10

Option 17A, No Front Panel. Deletes the front panel for use in re mote control applications where a front panel display or keyboard control are not needed.

Option 18, mmWave Module Bias Output. Provides bias output for 54000-xWRxx Millimeter Wave Source Modules. BNC Twinax connector, rear panel.

Option 19, SCPI Programmability. Adds GPIB command mnemonics complying with Standard Commands for Programmable Instruments (SCPI), Version 1993.0. SCPI programming complies with IEEE 488.2-1987.

Option 22, 0.1 Hz to 10 MHz Audio Frequency. Adds frequency coverage below 10 MHz. In models having a high-end frequency of £20 GHz, rated output power is reduced by 1 dB; in models having a high-end frequency of >20 GHz, rated output power is reduced by 2 dB.

–10

/day frequency stability.

1-8 PERFORMANCE

SPECIFICATIONS

Series 681XXC Synthesized Signal Generator performance specifica tions are provided in Appendix B.

681XXC OM 1-7

GENERAL RECOMMENDED INFORMATION TEST EQUIPMENT

1-9 RECOMMENDED TEST

EQUIPMENT

Table 1-2 lists the recommended test equipment for performing the Se ries 681XXC Synthesized Signal Generator operation verification tests in Chapter 5.

Table 1-2. Recommended Test Equipment

Instrument Critical Specification Recommended Manufacturer/Model

Frequency Counter, with Cable Kit and External Mixer

Power Meter, with Power Sensors

Oscilloscope Bandwidth: DC to 150 MHz

Range: 0.01 to 65 GHz Input Z: 50W Resolution: 1Hz Other: External Time Base

Input

Range: –30 to +20 dBm (1 mW to 100 mW)

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

EIP Microwave, Inc. Models 538B, 548B, or 578B, with Cable Kit: Option 590 and External Mixer:

Option 91 (26.5 to 40 GHz) Option 92 (40 to 60 GHz) Option 93 (60 to 90 GHz)

Anritsu Model ML2437Aor ML2438A, with Power Sensors:

MA2474A (0.01 to 40 GHz) MA2475A (0.01 to 50 GHz)

Tektronix, Inc. Model TAS485

1-8 681XXC OM

Chapter 2 Installation

Table of Contents

2-1 INTRODUCTION ...................2-3

2-2 INITIAL INSPECTION ................2-3

2-3 PREPARATION FOR USE ..............2-4

Power Requirements...............2-4

Line Voltage Selection ..............2-4

Power Connection ................2-4

Standby Operation................2-5

Warmup Time ..................2-6

Operating Environment .............2-6

2-4 GPIB SETUP AND INTERCONNECTION .....2-7

Interface Connector ...............2-7

Cable Length Restrictions ............2-7

GPIB Interconnection ..............2-7

Setting the GPIB Address ............2-7

Selecting the Line Terminator ..........2-9

Selecting the Interface Language.........2-9

2-5 RACK MOUNTING KIT INSTALLATION .....2-10

Preliminary ..................2-10

Procedure ...................2-10

2-6 PREPARATION FOR STORAGE/SHIPMENT . . . 2-13

Preparation for Storage.............2-13

Preparation for Shipment............2-13

Chapter 2 Installation

2-1 INTRODUCTION This chapter provides installation instructions for the Series 681XXC

Synthesized Signal Generator. It includes information on initial in spection, preparation for use, storage, and reshipment, and General Purpose Interface Bus (GPIB) setup and interconnections.

WARNING

Use two or more people to lift and move this equipment, or use an equipment cart. There is a risk of back injury, if this equipment is lifted by one person.

2-2 INITIAL INSPECTION Inspect the shipping container for damage. If the shipping container or

cushioning material is damaged, retain until the contents of the shipment have been checked against the packing list and the signal generator has been checked for mechanical and electrical operation.

If the shipment is incomplete or if the signal generator is damaged mechanically or electrically, notify your local sales representative or Anritsu Customer Service. If either the shipping container is damaged or the cushioning material shows signs of stress, notify the carrier as well as Anritsu. Keep the shipping materials for the carrier’s inspec tion.

681XXC OM 2-3

PREPARATION

INSTALLATION FOR USE

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 and connecting the signal generator to the power source. The following paragraphs provide these procedures along with information about power require ments, warmup times, and the operating environment.

Power Requirements

Before applying power, verify that the unit is set to match the available line voltage and that the installed fuse is of the correct type and rating.

Line Voltage Selection

The signal generator accepts 90 to 132 Vac and 180 to 264 Vac, 48 to 440 Hz, single-phase power. Power consumption is 400 VA maximum. The signal gen erator is intended for Installation Category (Over voltage Category) II.

CAUTION

The line voltage selector switch on the rear panel can be set for either 110 Vac or 220 Vac operation (Figure 2-1). When the switch is set to 110 Vac, the 681XXC accepts 90 to 132 Vac line voltage. When the switch is set to 220 Vac, the 681XXC accepts 180 to 264 Vac line voltage. If the selector setting is incorrect for the line voltage available, change it to the correct setting.

Whenever the selector setting is changed, the line fuse must be changed to the correct value for the line voltage selected. Line fuse values for the line voltages are printed on the rear panel next to the fuse holder.

WARNING

Power Connection

Connecting the 681XXC to line power automatically places it in operation (front panel OPERATE LED on). To connect it to the power source, plug the fe male end of the power cable into the input line volt age receptacle on the rear panel (Figure 2-1). Then plug the male end of the power cord into a threewire power line outlet.

2-4 681XXC OM

PREPARATION

INSTALLATION FOR USE

Line Fuse

Line Voltage Selector Switch

GPIB

Connector

OPERATE

LINE

STANDBY

LEVEL

CONTROL

MODULATION

SYSTEM

Line Key

Figure 2-1. Signal Generator Rear Panel showing Power Connection

Standby Operation

Whenever the signal generator is not being used it should be left connected to the power source and placed in standby. This keeps the internal timebase frequency reference at operating temperature.

On the front panel, press LINE to switch the 681XXC from OPERATE (green LED on) to STANDBY (orange LED on).

NOTE

During standby operation, the fan runs continuously.

681XXC OM 2-5

PREPARATION

INSTALLATION FOR USE

Warmup Time

Operating Environment

From Standby–When placing the 681XXC in op eration from stand-by, allow 30 minutes warmup to assure stable operation.

From a Cold Start (0°C)–The signal generator re quires approximately 120 hours (5 days) of warm up to achieve specified frequency stability with aging.

NOTE

Instruments disconnected from AC power for more than 72 hours require 30 days to return to specified aging.

The 681XXC can be operated within the following environmental limits.

Temperature. 0°Cto50°C.

Humidity. 5 to 95% relative at 40°C.

Altitude. up to 4600 meters.

Cooling. Internal cooling is provided by forced

airflow from the fan mounted on the rear panel.

CAUTION

Before installing the 681XXC in its operating environment, ensure that all airflow passages at the sides and rear of the instrument are clear. This is of particular importance whenever the unit is being rack-mounted.

Keep the cooling fan filter clean so that the ventilation holes are not obstructed. A blocked fan filter can cause the instru ment to overheat and shut down.

2-6 681XXC OM

GPIB SETUP AND

INSTALLATION INTERCONNECTION

2-4 GPIB SETUP AND

INTERCONNECTION

The 681XXC provides automated microwave signal generation via the GPIB. The following paragraphs provide information about interface connections, cable requirements, setting the GPIB operating parame ters, and selecting the external interface language.

Interface Connector

Cable Length Restrictions

Interface between the signal generator and other de vices on the GPIB is via a 24-wire interface cable. This cable uses connector shells having two connec tor faces. These double-faced connectors allow for the parallel connection of two or more cables to a single device. Figure 2-1 shows the location of the rear panel GPIB connector.

The GPIB can accommodate up to 15 instruments at any one time. To achieve design performance on the bus, proper timing and voltage level relationships must be maintained. If either the cable length be tween separate instruments or the cumulative cable length between all instruments is too long, the data and control lines cannot be driven properly and the system may fail to perform. Cable length restrictions are as follows:

No more than 15 instruments may be installed on the bus.

Total cumulative cable length in meters may not exceed two times the number of bus instruments or 20 meters—whichever is less.

NOTE

For low EMI applications, the GPIB cable should be a fully shielded type, with well-grounded metal-shell connectors

GPIB Inter connection

Setting the GPIB Address

The only interconnection required for GPIB opera tion is between the signal generator and the control ler. This interconnection is via a standard GPIB cable. The Anritsu Part number for such a cable is 2000-1, -2, or -4 (1, 2, or 4 meters in length).

The default GPIB address is 5. If a different GPIB address is desired, it can be set from the front panel using the Configure GPIB Menu.

To change the GPIB address, first press the front panel main menu key labeled SYSTEM . The Sys tem Menu (shown on the following page) is dis played.

681XXC OM 2-7

GPIB SETUP AND

INSTALLATION INTERCONNECTION

Now press the menu soft-key Config . The System Configuration Menu (below) is displayed.

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

Press the menu soft-key GPIB Address to change the current GPIB address of the signal generator. Enter a new address using the cursor control key or the data entry keypad and the terminator key

ADRS

The new GPIB address will now appear on the dis play. The entry must be between 1 and 30 to be rec ognized as a valid GPIB address.

2-8 681XXC OM

GPIB SETUP AND

INSTALLATION INTERCONNECTION

Selecting the Line Terminator

Selecting the Interface Language

Data is delimited on the GPIB by either the carriage return (CR) ASCII character or both the carriage re turn and line feed (CR/LF) ASCII characters. Which character is used depends upon the requirements of the system controller. Most modern controllers can use either CR or CR/LF, while many older control lers require one or the other. Consult the controller’s manual for its particular requirements.

From the Configure GPIB Menu display, you can se lect which GPIB terminator to use by pressing the menu soft-key Line Term . This menu soft-key tog gles the GPIB terminator between CR and CR/LF. The current selection appears on the display.

Series 681XXC Synthesized Signal Generators can be remotely operated via the GPIB using one of two external interface languages—Native or SCPI (Op tion 19). The Native interface language uses a set of 681XXC GPIB Product Specific commands to control the instrument; the SCPI interface language uses a set of the Standard Commands for Programmable Instruments commands to control the unit.

The Configure GPIB Menu has additional menu displays. For instruments with Option 19, selection of which external interface language is to be used is made from this additional menu. From the Configure GPIB Menu display, you can access the first additional menu by pressing More . The first Addi tional Configure GPIB Menu (below) is displayed.

Press Native SCPI to select the external interface language to be used. This menu soft-key toggles the language selection between Native and SCPI. The current selection appears on the display.

681XXC OM 2-9

RACK MOUNTING KIT

INSTALLATION INSTALLATION

2-5 RACK MOUNTING KIT

INSTALLATION

The rack mounting kit (Option 1) contains a set of track slides (90° tilt capability), mounting ears, and front panel handles for mounting the signal generator in a standard equipment rack. The following proce dure provides instructions for installing the rack mounting hardware on to the instrument. Refer to Figures 2-2 and 2-3 during this proce dure.

Preliminary Disconnect the power cord and any other cables

from the instrument.

Procedure Install the rack mounting hardware as follows:

Step 1 Using a Phillips screwdriver, remove the

screws and the front handle assemblies from the instrument. (For instruments not having front handles, remove the screws and the front top and bottom feet from the instrument.) Retain the screws.

Step 2 Remove the four feet from the rear of the

instrument. Retain the screws.

Step 3 Remove the screws and the carrying han-

dle from the side handle cover. (The two screws fastening the carrying handle through the side handle cover to the chassis are accessable by lifting up the rubber covering at each end of the handle.)

Figure 2-2. Front Handle, Feet, and Carrying Handle Removal

2-10 681XXC OM

RACK MOUNTING KIT

INSTALLATION INSTALLATION

Step 4 Remove the inner slide assemblies from

the outer slide assemblies.

Step 5 Place the left side inner slide assembly

NOTE

The screws with green heads have metric threads. When it becomes necessary to replace any of these screws, always use the exact re placement green-headed screws (Anritsu P/N 2000-560) to avoid damage to the instrument.

Step 6 Insert two green-headed screws through

Step 7 Insert two green-headed screws through

onto the instrument case with the handle towards the front of the instrument (Fig ure 2-3).

the holes in the slide assembly behind the handle and into the metric tapped holes in the side of the instrument.

the holes near the rear of the slide assem bly and into the metric tapped holes in the side of the instrument.

Step 8 Insert the two SAE threaded screws (re

moved from the feet) through the 90° tabs on the rear of the slide assembly and into the rear panel of the instrument.

Step 9 Using the Phillips screwdriver, tighten all

screws holding the left side slide assembly to the instrument chassis.

Figure 2-3. Rack Mounting Hardware Installation

681XXC OM 2-11

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