Anritsu 69167B GPIB Programmers Guide

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SERIES 683XXC

SYNTHESIZED HIGH PERFORMANCE

SIGNAL GENERATOR

GPIB PROGRAMMING MANUAL

490 JARVIS DRIVE MORGAN HILL, CA 95037-2809

P/N: 10370-10338

REVISION: A

PRINTED: JANUARY 1999

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 to Anritsu for warranty repairs. Obligation islimited to the originalpurchaser. Anritsuis not liable forconsequential 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,unauthorizedmodification or misuse, oroperationoutside of the environmentalspecifications of the product. No other warranty is expressed or implied, and the remedies provided herein are the Buyer’s sole and exclusive remedies.

TRADEMARK ACKNOWLEDGEMENTS

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, specifications, and informationis prohibited; theyshall not bereproduced, copied, or used in whole orin part as the basis for manufacture or sale of the equipment or software programs without the prior writtten consent of Anritsu Company.

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1. Make the manual changes listed below. The changes are listed in numerical order by page number. Effectivity is all 683XXC models with Firmware Version 1.01 and above.

2. The replacement pages provided are for technical changes to the manual. The black bar or bars in the replacement page margins shows the area in which the changes were made.

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683XXC PM C-1

Chapter 1 - General GPIB Information

1-1 SCOPE OF MANUAL.................1-3

Electronic Manual ..................1-3

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

1-3 IEEE-488 INTERFACE BUS DESCRIPTION ...1-5

Functional Elements.................1-6

Bus Structure.....................1-7

Data Bus Description ................1-7

Data Byte Transfer Control Bus Description ....1-8

General Interface Management Bus Description. . 1-9

Device Interface Function Capability .......1-10

Message Types ...................1-11

1-4 683XXC GPIB OPERATION.............1-13

Setting GPIB Operating Parameters .......1-13

Selecting the Interface Language .........1-13

Response to GPIB Interface Function Messages . 1-13

Chapter 2 - Programming with GPIB Commands

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

2-2 COMMAND CODES .................2-3

2-3 DATA INPUT RESTRICTIONS............2-6

2-4 PARAMETER AND DATA ENTRY COMMANDS . . 2-7

Opening a Parameter ................2-7

Data Entry ......................2-7

Using the SYZ Command..............2-15

2-5 CW FREQUENCY COMMANDS ..........2-16

2-6 ANALOG AND STEP SWEEP COMMANDS....2-17

Sweep Range ....................2-17

Alternate Sweep ..................2-18

Sweep Triggering ..................2-18

Analog/Step Sweep Select .............2-20

Special Step Sweep .................2-22

2-7 FREQUENCY MARKER COMMANDS ......2-22

2-8 OUTPUT POWER LEVELING COMMANDS . . . 2-24

683XXC PM i

Table of Contents (Continued)

Linear or Logarithmic Power Level Selection . . . 2-24

RF Output Power Level Selection .........2-24

Alternate Sweep RF Output Power Level Selection2-24

Output Power Leveling ...............2-24

ALC Power Slope ..................2-27

Attenuator Decoupling ...............2-27

2-9 MODULATION COMMANDS............2-28

Amplitude Modulation ...............2-28

Frequency Modulation ...............2-29

Phase Modulation..................2-30

Pulse Modulation ..................2-31

2-10 MEASURE FUNCTION COMMANDS .......2-39

2-11 OUTPUT COMMANDS ...............2-40

2-12 STORED SETUP COMMANDS...........2-45

2-13 SRQ AND STATUS BYTE COMMANDS ......2-47

Status Bytes.....................2-47

SRQ Generation...................2-47

2-14 CONFIGURATION COMMANDS..........2-52

2-15 GROUP EXECUTE TRIGGER COMMANDS . . . 2-53

2-16 LIST SWEEP COMMANDS.............2-54

Accessing and Editing a List ............2-54

List Sweep Triggering ...............2-56

Generating a List Sweep ..............2-56

2-17 FAST-FREQUENCY-SWITCHING COMMANDS . 2-58

Loading the Frequency Table ...........2-58

2-18 POWER-OFFSET-TABLE COMMANDS ......2-62

Loading the Power-Offset Table ..........2-62

2-19 USER LEVEL CALIBRATION COMMANDS . . . 2-65

Editing the Table Data ...............2-69

2-20 MASTER-SLAVE OPERATION COMMANDS . . . 2-73

2-21 SELF TEST COMMAND ..............2-74

2-22 MISCELLANEOUS COMMANDS .........2-76

2-23 PROGRAM ERRORS ................2-77

Invalid Parameter .................2-77

Syntax ........................2-77

ii 683XXC PM

Table of Contents (Continued)

2-24 RESET PROGRAMMING AND DEFAULT

CONDITIONS ...................2-78

2-25 PROGRAMMING EXAMPLES ...........2-79

Appendix A - Index of GPIB Commands

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

683XXC PM iii/iv

Chapter 1 General GPIB Information

Table of Contents

1-1 SCOPE OF MANUAL.................1-3

Electronic Manual ..................1-3

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

1-3 IEEE-488 INTERFACE BUS DESCRIPTION ...1-5

Functional Elements.................1-6

Bus Structure.....................1-7

Data Bus Description ................1-7

Data Byte Transfer Control Bus Description ....1-8

General Interface Management Bus Description. . 1-9

Device Interface Function Capability .......1-10

Message Types ...................1-11

1-4 683XXC GPIB OPERATION.............1-13

Setting GPIB Operating Parameters .......1-13

Selecting the Interface Language .........1-13

Response to GPIB Interface Function Messages . 1-13

Chapter 1 General GPIB Information

1-1

SCOPE OF MANUAL

This manual provides information for remote operation of the Series 683XXC Synthesized High Performance Signal Generator using commands sent from an external controller via the IEEE-488 General Purpose Interface Bus (GPIB). It includes the following:

A general description of the GPIB and the bus data transfer and

control functions. A listing of the IEEE-488 Interface Function Messages recog-

nized by the signal generator with a description of its response. A complete listing and description of all 683XXC GPIB com-

mands (i.e., Product Specific Commands) that can be used to control signal generator operation with programming examples.

This manual is intended to be used in conjunction with the Series 683XXC Synthesized High Performance Signal Generator Operation Manual, P/N 10370-10337. Refer to that manual for general information about the 683XXC, including equipment set up and front panel (manual mode) operating instructions.

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.

1-2

INTRODUCTION

This chapter provides a general description of the GPIB and the bus data transfer and control functions. It also contains a listing of the 683XXC’s GPIB interface function subset capability and response to IEEE-488 interface function messages.

The GPIB information presented in this chapter is general in nature. For complete and specific information, refer to the following documents: ANSI/IEEE Std 488.1-1987 IEEE Standard Digital Interface

for Programmable Instrumentation and ANSI/IEEE Std 488.2-1987 IEEE Standard Codes, Formats, Protocols and Common Commands.

These documents precisely define the total specification of the mechanical and electrical interface, and of the data transfer and control protocols.

683XXC PM 1-3

GENERAL GPIB IEEE-488 INTERFACE INFORMATION BUS DESCRIPTION

IE EE -488 B U S (16 L ines)

DEVICE A

A b le to ta lk , lis te n , and control

(e.g. CO M PUTER)

DEVICE B

A b le to ta lk a n d lis te n

(e.g. 683X XC SIGNAL GENERATOR)

DEVICE C

D a ta B u s

(8 signal lines)

D a ta B y te T ra n s fe r Control Bus

(3 signal lines)

DATA LINES

HANDSHAKE Lines

O n ly a b le to lis te n

(e.g. O THER IN STR UM ENT**)

DEVICE D

O n ly a b le to ta lk

(e.g. O THER IN STR UM ENT**)

G eneral Interface M anagem ent B us

(5 signal lines)

DATA INPUT/OUTPUT, DIO 1 thru DIO 8

DAV - DATA VALID NRFD - NOT READY FOR DATA* NDAC - NO T DATA ACCEPTED*

IFC - INTERFACE CLEAR ATN - ATTENTION SRQ - SERVICE REQ UEST REN - REMO TE ENABLE E O I - E N D O R ID E N T IF Y

* NEG ATION IS REPRESENTED B Y LOW STATE ON THESE TW O LINES

** IF U S E D

Figure 1-1. Interface Connections and GPIB Bus Structure

M anagem ent C O N TR O L Lines

1-4 683XXC PM

GENERAL GPIB IEEE-488 INTERFACE INFORMATION BUS DESCRIPTION

1-3

IEEE-488 INTERFACE BUS DESCRIPTION

The IEEE-488 General Purpose Interface Bus (GPIB) is an instrumentation interface for integrating instruments, computers, printers, plotters, and other measurement devices into systems. The GPIB uses 16 signal lines to effect transfer of information between all devices connected on the bus.

The following requirements and restrictions apply to the GPIB.

No more than 15 devices can be interconnected by one contiguous

bus; however, an instrumentation system may contain more than one interface bus. The maximum total cumulative cable length for one interface bus

may not exceed twice the number of devices connected (in meters), or 20 meters—whichever is less. A maximum data rate of 1 Mb/s across the interface on any sig-

nal line. Each device on the interface bus must have a unique address,

ranging from 00 to 30.

The devices on the GPIB are connected in parallel, as shown in Figure 1-1. The interface consists of 16 signal lines and 8 ground lines in a shielded cable. Eight of the signal lines are the data lines, DIO 1 thru DIO 8. These data lines carry messages (data and commands), one byte at a time, among the GPIB devices. Three of the remaining lines are the handshake lines that control the transfer of message bytes between devices. The five remaining signal lines are referred to as interface management lines.

The following paragraphs provide an overview of the GPIB including a description of the functional elements, bus structure, bus data transfer process, interface management bus, device interface function requirements, and message types.

683XXC PM 1-5

GENERAL GPIB IEEE-488 INTERFACE INFORMATION BUS DESCRIPTION

Functional Elements

Effective communications between devices on the GPIB requires three functional elements; a talker,a listener, and a controller. Each device on the GPIB is categorized as one of these elements depending on its current interface function and capabilities.

Talker

A talker is a device capable of sending devicedependent data to another device on the bus when addressed to talk. Only one GPIB device at a time can be an active talker.

Listener

A listener is a device capable of receiving devicedependent data from another device on the bus when addressed to listen. Any number of GPIB devices can be listeners simultaneously.

Controller

A controller is a device, usually a computer, capable of managing the operation of the GPIB. Only one GPIB device at a time can be an active controller. The active controller manages the transfer of device-dependent data between GPIB devices by designating who will talk and who will listen.

System Controller

The system controller is the device that always retains ultimate control of the GPIB. When the system is first powered-up, the system controller is the active controller and manages the GPIB. The system controller can pass control to a device, making it the new active controller. The new active controller, in turn, may pass control on to yet another device. Even if it is not the active controller, the system controller maintains control of the Interface Clear (IFC) and Remote Enable (REN) interface management lines and can thus take control of the GPIB at anytime.

1-6 683XXC PM

GENERAL GPIB IEEE-488 INTERFACE INFORMATION BUS DESCRIPTION

Bus Structure

The GPIB uses 16 signal lines to carry data and commands between the devices connected to the bus. The interface signal lines are organized into three functional groups.

Data Bus (8 lines)

Data Byte Transfer Control Bus (3 lines)

General Interface Management Bus (5 lines)

The signal lines in each of the three groups are designated according to function. Table 1-1 lists these designations.

Table 1-1. Interface Bus Signal Line Designations

Bus Type

Data Bus DIO1–DIO8 Data Input/Output, 1 thru 8 Data Byte

Transfer Control Bus

General Interface Management Bus

Signal Line

DAV NRFD NDAC

ATN IFC SRQ REN EOI

Name

Data Available Not Ready For Data Not Data Accepted

Attention Interface Clear Service Request Remote Enable End Or Identify

Function

Data Bus Description

The data bus is the conduit for the transfer of data and commands between the devices on the GPIB. It contains eight bi-directional, active-low signal lines —DIO 1 thru DIO 8. Data and commands are transferred over the data bus in byte-serial, bit-parallel form. This means that one byte of data (eight bits) is transferred over the bus at a time. DIO 1 represents the least-significant bit (LSB) in this byte and DIO 8 represents the most-significant bit (MSB). Bytes of data are normally formatted in seven-bit ASCII (American Standard Code for Information Interchange) code. The eighth (parity) bit is not used.

Each byte placed on the data bus represents either a command or a data byte. If the Attention (ATN) interface management line is TRUE while the data is transferred, then the data bus is carrying a bus command which is to be received by every GPIB device. If ATN is FALSE, then a data byte is being transferred and only the active listeners will receive that byte.

683XXC PM 1-7

GENERAL GPIB IEEE-488 INTERFACE

1st Data Byte 2nd Data Byte

Valid

Not

Valid

Not

Valid

All

Ready

None

Ready

All

Ready

None

Ready

All

None

All

DIO1-DIO8

(composite)

DAV

NRFD

NDAC

INFORMATION BUS DESCRIPTION

Figure 1-2. Typical GPIB Handshake Operation

Data Byte Transfer Control Bus Description

Control of the transfer of each byte of data on the data bus is accomplished by a technique called the “three-wire handshake”, which involves the three signal lines of the Data Byte Transfer Control Bus. This technique forces data transfers at the speed of the slowest listener, which ensures data integrity in multiple listener transfers. One line (DAV) is controlled by the talker, while the other two (NRFD and NDAC) are wired-OR lines shared by all active listeners. The handshake lines, like the other GPIB lines, are active low. The technique is described briefly in the following paragraphs and is depicted in Figure 1-2. For further information, refer to ANSI/IEEE Std 488.1.

DAV (Data Valid)

This line is controlled by the active talker. Before sending any data, the talker verifies that NDAC is TRUE (active low) which indicates that all listeners have accepted the previous data byte. The talker then places a byte on the data lines and waits until NRFD is FALSE (high) which indicates that all addressed listeners are ready to accept the information. When both NRFD and NDAC are in the proper state, the talker sets the DAV line TRUE (active low) to indicate that the data on the bus is valid (stable).

1-8 683XXC PM

NRFD (Not Ready For Data)

This line is used by the listeners to inform the talker when they are ready to accept new data. The talker must wait for each listener to set the NRFD

GENERAL GPIB IEEE-488 INTERFACE INFORMATION BUS DESCRIPTION

line FALSE (high) which they will do at their own rate. This assures that all devices that are to accept the data are ready to receive it.

NDAC (Not Data Accepted)

This line is also controlled by the listeners and is used to inform the talker that each device addressed to listen has accepted the data. Each device releases NDAC at its own rate, but NDAC will not go FALSE (high) until the slowest listener has accepted the data byte.

General Interface Management Bus Description

The general interface management bus is a group of five signal lines used to manage the flow of information across the GPIB. A description of the function of each of the individual control lines is provided below.

ATN (Attention)

The active controller uses the ATN line to define whether the information on the data bus is a command or is data. When ATN is TRUE (low), the bus is in the command mode and the data lines carry bus commands. When ATN is FALSE (high), the bus is in the data mode and the data lines carry devicedependent instructions or data.

EOI (End or Identify)

The EOI line is used to indicate the last byte of a multibyte data transfer. The talker sets the EOI line TRUE during the last data byte.

The active controller also uses the EOI line in conjunction with the ATN line to initiate a parallel poll sequence.

IFC (Interface Clear)

Only the system controller uses this line. When IFC is TRUE (low), all devices on the bus are placed in a known, quiescent state (unaddressed to talk, unaddressed to listen, and service request idle).

REN (Remote Enable)

Only the system controller uses this line. When REN is set TRUE (low), the bus is in the remote mode and devices are addressed either to listen or to talk. When the bus is in remote and a device is addressed, it receives instructions from the GPIB rather than from its front panel. When REN is set FALSE (high), the bus and all devices return to local operation.

683XXC PM 1-9

GENERAL GPIB IEEE-488 INTERFACE INFORMATION BUS DESCRIPTION

SRQ (Service Request)

The SRQ line is set TRUE (low) by any device requesting service by the active controller.

Device Interface Function Capability

An interface function is the GPIB system element which provides the basic operational facility through which a device can receive, process, and send messages. Each specific interface function may only send or receive a limited set of messages within particular classes of messages. As a result, a set of interface functions is necessary to achieve complete communications among devices on the GPIB. ANSI/IEEE Std 488.1 defines each of the interface functions along with its specific protocol.

ANSI/IEEE Std 488.2 specifies the minimum set of IEEE 488.1 interface capabilities that each GPIB device must have. This minimum set of interface functions assures that the device is able to send and receive data, request service, and repond to a device clear message. Table 1-2 lists the interface function capability of the series 683XXC signal generators.

Table 1-2. 683XXC Interface Function Capability

Function Identifier

AH1 Acceptor Handshake Complete Capability SH1 Source Handshake Complete Capability

Function 683XXC Capability

T6 Talker No Talk Only (TON)

L4 Listener No Listen Only (LON) SR1 Service Request Complete Capability RL1 Remote/Local Complete Capability PP1 Parallel Poll Complete Capability DC1 Device Clear Complete Capability DT1 Device Trigger Complete Capability

C0, C1, C2,

C3, C28

E2 Tri-StateDrivers Three-state bus drivers

Controller Capability Options

C0, No Capability; C1, System Controller; C2, Send IFC and Take Charge; C3, Send REN; C28, Send IF Messages

1-10 683XXC PM

GENERAL GPIB IEEE-488 INTERFACE INFORMATION BUS DESCRIPTION

Message Types

There are three types of information transmitted over the GPIB—interface function messages, device-specific commands, and data and instrument status messages.

Interface Function Messages

The controller manages the flow of information on the GPIB using interface function messages, usually called commands or command messages. Interface function messages perform such functions as initializing the bus, addressing and unaddressing devices, and setting device modes for remote or local operation.

There are two types of commands—multiline and uniline. Multiline commands are bytes sent by the active controller over the data bus (DIO1-DIO8) with ATN set TRUE. Uniline commands are signals carried by the individual interface management lines.

The user generally has control over these commands; however, the extent of user control depends on the implementation and varies with the specific GPIB interface hardware and software used with the external controller.

Device-Specific Commands

These commands are keywords or mnemonic codes sent by the external controller to control the setup and operation of the addressed device or instrument. The commands are normally unique to a particular instrument or class of instruments and are described in its documentation.

Device-specific commands are transmitted over the data bus of the GPIB to the device in the form of ASCII strings containing one or more keywords or codes.They are decoded by the device’s internal con- troller and cause the various instrument functions to be performed.

Data and Instrument Status Messages

These messages are sent by the device to the external controller via the GPIB. They contain measurement results, instrument status, or data files that the device transmits over the data bus in response to specific requests from the external controller. The contents of these messages are instrument specific and may be in the form of ASCII strings or binary data.

683XXC PM 1-11

GENERAL GPIB IEEE-488 INTERFACE INFORMATION BUS DESCRIPTION

In some cases data messages will be transmitted from the external controller to the device. For example, messages to load calibration data.

An SRQ (service request) is an interface function message sent from the device to the external controller to request service from the controller, usually due to some predetermined status condition or error. To send this message, the device sets the SRQ line of the General Interface Management Bus true, then sends a status byte on the data bus lines.

An SRQ interface function message is also sent by the device in response to a serial poll message from the controller, or upon receiving an Output Status Byte(s) command from the controller. The protocols associated with the SRQ functions are defined in the ANSI/IEEE Std 488.2 document.

The manner in which interface function messages and device-specific commands are invoked in programs is implementation specific for the GPIB interface used with the external controller. Even though both message types are represented by mnemonics, they are implemented and used in different ways.

Normally, the interface function messages are sent automatically by the GPIB driver software in response to invocation of a software function. For example, to send the IFC (Interface Clear) interface fuction message, one would call the ibsic function of the National Instruments software driver. On the other hand, the command *RST (Reset) is sent in a command string to the addressed device. In the case of the National Instruments example, this would be done by using the ibwrt function call.

1-12 683XXC PM

GENERAL GPIB 683XXC INFORMATION GPIB OPERATION

1-4

683XXC GPIB OPERATION

All Series 683XXC Synthesized High Performance Signal Generator functions, settings, and operating modes (except for power on/standby) are controllable using commands sent from an external controller via the GPIB. When in the remote (GPIB) mode, the signal generator functions both as a listener and a talker. The GPIB interface function capability of the 683XXC is listed in Table 1-2 (page 1-10).

Setting GPIB Operating Parameters

Selecting the Interface Language

The 683XXC leaves the factory with the GPIB address value set to 5 and the data delimiting terminator set to carriage return and line feed (CR/LF). A different address value can be entered from the front panel using the Configure GPIB menu. Using this same menu, the data delimiting terminator can be changed to carriage return (CR) only. Refer to Chapter 2 of the Series 683XXC Synthesized High Performance Signal Generator Operation Manual for the procedure.

Series 683XXC Synthesized High Performance Signal Generators with Option 19 can be remotely operated using one of two external interface languages —Native or SCPI. The Native interface language uses a set of 683XXC 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. Selecting which of these external interface languages is to be used can be done from the front panel using the Configure GPIB menu. Refer to Chapter 2 of the Series 683XXC Synthesized High Performance Signal Generator Operation Manual for the procedure.

Response to GPIB Interface Function Messages

Table 1-3 (page 1-14) lists the GPIB Interface Function Messages that the 683XXC will recognize and respond to. With the exception of the Device Clear and Selected Device Clear messages, these messages affect only the operation of the 683XXC GPIB interface. The signal generator's response for each message is indicated.

Interface function messages are transmitted on the GPIB data lines and interface management lines as either unaddressed or addressed commands. The manner in which these messages are invoked in programs is implementation dependent. For programming information, refer to the documentation included with the GPIB Interface for the external controller used.

683XXC PM 1-13

GENERAL GPIB 683XXC INFORMATION GPIB OPERATION

Table 1-3. 683XXC Response to GPIB Interface Function Messages

Interface Function Message

Addressed

Command

683XXC Response

Device Clear (DCL) Selected Device Clear (SDC)

Go To Local (GTL) Yes Returnsthe 683XXC to local (front

Group Execute Trigger (GET)

Interface Clear (IFC) No Stops the683XXC GPIB interface

Local Lockout (LLO) No Disables the frontpanel menu

Remote Enable (REN) No Places the 683XXC under remote

Serial-Poll Enable (SPE) No Outputs the serial-poll status byte. Serial-Poll Disable (SPD) No Disables the serial-poll function. Parallel-Poll Configure (PPC) Yes Respondsto a parallel-poll message

Parallel-Poll Unconfigure (PPU)

Yes

Yes Executesa string of commands, if

No Disables the parallel-poll function.

Resets the 683XXC to itsdefault state. (Equivalent to sending the

RST command.)

panel) control.

programmed.

from listening or talking. (Thefront panel controls are not cleared.)

RETURN TO LOCALsoft-key.

(GPIB) control when it hasbeen addressed to listen.

(PPOLL) by setting assigned data bus line to the logicalstate (1,0) that indicates its correct SRQ status.

1-14 683XXC PM

Chapter 2 Programming with GPIB Commands

Table of Contents

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

2-2 COMMAND CODES .................2-3

2-3 DATA INPUT RESTRICTIONS............2-6

2-4 PARAMETER AND DATA ENTRY COMMANDS . . 2-7

Opening a Parameter ................2-7

Data Entry ......................2-7

Using the SYZ Command..............2-15

2-5 CW FREQUENCY COMMANDS ..........2-16

2-6 ANALOG AND STEP SWEEP COMMANDS....2-17

Sweep Range ....................2-17

Alternate Sweep ..................2-18

Sweep Triggering ..................2-18

Analog/Step Sweep Select .............2-20

Special Step Sweep .................2-22

2-7 FREQUENCY MARKER COMMANDS ......2-22

2-8 OUTPUT POWER LEVELING COMMANDS . . . 2-24

Linear or Logarithmic Power Level Operation . . 2-24

RF Output Power Level Selection .........2-24

Alternate Sweep RF Output Power Level

Selection ......................2-24

Output Power Leveling ...............2-24

ALC Power Slope ..................2-27

Attenuator Decoupling ...............2-27

Table of Contents (Continued)

2-9 MODULATION COMMANDS............2-28

Amplitude Modulation ...............2-28

Frequency Modulation ...............2-29

Phase Modulation..................2-30

Pulse Modulation ..................2-31

2-10 MEASURE FUNCTION COMMANDS .......2-39

2-11 OUTPUT COMMANDS ...............2-40

2-12 STORED SETUP COMMANDS...........2-45

2-13 SRQ AND STATUS BYTE COMMANDS ......2-47

Status Bytes.....................2-47

SRQ Generation...................2-47

2-14 CONFIGURATION COMMANDS..........2-52

2-15 GROUP EXECUTE TRIGGER COMMANDS . . . 2-53

2-16 LIST SWEEP COMMANDS.............2-54

Accessing and Editing a List ............2-54

List Sweep Triggering ...............2-56

Generating a List Sweep ..............2-56

2-17 FAST-FREQUENCY-SWITCHING COMMANDS . 2-58

Loading the Frequency Table ...........2-58

2-18 POWER-OFFSET-TABLE COMMANDS ......2-62

Loading the Power-Offset Table ..........2-62

2-19 USER LEVEL CALIBRATION COMMANDS . . . 2-65

Editing the Table Data ...............2-69

2-20 MASTER-SLAVE OPERATION COMMANDS . . . 2-73

2-21 SELF TEST COMMAND ..............2-74

2-22 MISCELLANEOUS COMMANDS .........2-76

2-23 PROGRAM ERRORS ................2-77

Invalid-Parameter .................2-77

Syntax ........................2-77

2-24 RESET PROGRAMMING AND DEFAULT

CONDITIONS ...................2-78

2-25 PROGRAMMING EXAMPLES ...........2-79

2-2 683XXC PM

Chapter 2 Programming with GPIB Commands

2-1

2-2

INTRODUCTION

COMMAND CODES

This chapter provides information for remote operation of the Series 683XXC Synthesized High Performance Signal Generators via the GPIB using 683XXC GPIB commands. All GPIB Product-Specific commands that are accepted and implemented by the 683XXC are listed and described by function. Sample programs showing usage of the commands are also included.

There are over four hundred and fifty GPIB Product-Specific commands that are accepted and implemented by the 683XXC. These GPIB commands allow the user to program all front panel and menu functions (except for power on/standby). Each GPIB command is a two- or three-character mnemonic code that represents an instrument command or parameter; for example: RST (reset).

Table 2-1, beginning on page 2-4, is a listing of all 683XXC GPIB command mnemonic codes grouped into functional categories. The listing for each category includes references to the paragraph and page number in this chapter where a complete description of that group of commands can be found.

NOTE

Aquick way to determine the function ofany of the GPIB command codes listed inTable 2-1 istolook up the commandcode of interest inAppendix A of thismanual. Appendix Ais analphabetical index of all 683XXC GPIB command mnemonic codes. Abrief description of the function of each command is also included.

683XXC PM 2-3

PROGRAMMING WITH COMMAND GPIB COMMANDS CODES

Table 2-1. 683XXC GPIB Command Codes Listed by Function (1 of 3)

GPIB Command Group Function

Parameter Entry Commands

Data Entry/ DataTerminator Commands

CW Frequency Commands

Command Codes Para. Page

F0, F1, F2, F3, F4,F5, F6, F7, F8, F9, M0, M1, M2, M3, M4, M5,M6, M7, M8, M9, XL0, XL1, XL2, XL3, XL4,XL5, XL6, XL7, XL8, XL9, DLF, DFF, DFM, SLF0, SLF1, SLF2, SLF3, SLF4, SLF5, SLF6,SLF7, SLF8, SLF9, SLM0, SLM1, SLM2,SLM3, SLM4, SLM5, SLM6, SLM7, SLM8,SLM9, SLDF, SDT, SNS, SWT, LOS, PDT, PNS, ADP1, ADP2, AMR, AMS, ASD,FDV, FMR, FMS, PHD, PHR, PHS,PER, PR, PW, W1, W2, W3, W4, PDY, D1, D2, D3, D4, PVT, SDD, SDE, SDL, SDS,SLP, SOF, SLV, SLL1, SLL2, EGI,ADD, FRS, LDT, SYZ, UP,DN, CLO

0 thru 9, –, .,ADR, CLR, DB, DM, GH, MH, KH, HZ, SEC, MS, US,NS, PCT, RD, GV, MV, KV, DV, PCV,RV, SPS, TMS, VT

CF0, CF1, CF2, CF3, CF4,CF5, CF6, CF7, CF8, CF9, CM0, CM1,CM2, CM3, CM4, CM5, CM6, CM7, CM8,CM9, SQF, SQU, SQD, ACW

2-4 2-7

2-4 2-13,

2-14

2-5 2-16

Analog and Step Sweep Commands

Frequency Marker Commands

Output Power Leveling Commands

Modulation Commands

SF1, SF3, FUL, DF0, DF1,DF5, DF6, AFU, AF1, AF3, AD1, AD5,AD6, AUT, HWT, EXT, TRG, TRS, RSS, SWP, SSP, LIS, LGS, MAN, DU1, DU0,TSS, SP1, SP0

ME1, ME0, MK0, IM1, VM1 2-7 2-22

LOG, LIN, L0, L1, L2,L3, L4, L5, L6, L7, L8, L9, AL0, AL1, AL2,AL3, AL4, AL5, AL6, AL7, AL8, AL9, RF1,RF0, LO1, LO0, IL1, DL1, PL1, ELF, ELR, LV0, LSP, AT0, AT1,ATT(xx), SL0, SL1, EGO

AM0, AM1, AM2, AM3, AM4,AM5, AM6, AM7, AM8, AMW(x), FM0, FM1,FM2, FM3, FM4, FM5, FM6, FM7,FM8, FM9, FMN, FMW, FML, FMU, FWV(x), PH0, PH1, PH2, PH3, PH4, PH5,PH6, PH7, PH8, PHN, PHW, PHV(x), P0, IP, XP, P3, P4, PC1, PC4, PMD(x), PTG(x),PTR, PTF, GP, DPT, SD0, SD1, SQP, SW0, SW1, SW2, SW3, SW4, SW5, SW6,SC0, SC1

2-6 2-17

2-8 2-24

2-9 2-28

2-4 683XXC PM

PROGRAMMING WITH COMMAND GPIB COMMANDS CODES

Table 2-1. 683XXC GPIB Command Codes Listed by Function (2 of 3)

GPIB Command Group Function

Measure Function Commands

Output Commands*IDN?, OI, OFL, OFH, OF0,OF1, OF2,

Stored Setup Commands

Service Request and Status Byte Commands

AMI, FMD, MOM, PM1, PM0 2-10 2-39

OF3, OF4, OF5, OF6, OF7,OF8, OF9, OM0, OM1, OM2, OM3, OM4,OM5, OM6, OM7, OM8, OM9, OL0, OL1,OL2, OL3, OL4, OL5, OL6, OL7, OL8,OL9, OLO, ODF, OPD, OPS, OSD, OSS, OST, OAD1, OAD2, OAR, OAW, OAS, OAB, OAI, OAE, OFD, OFR, OFW, OFK, OFS, OFI,OFE, OPR, OPP,OPW,OW1, OW2, OW3, OW4, ODP, OD1, OD2, OD3, OD4, ODD, ODE, ODL, ODS, OMD, OPC, OPT, OP5, OP3, OMM, OPHD, OPHR, OPHW, OPHM, OPHS, OPHI, OPHE, OPM, OVN,OWT, OSE, OEM, OES, OSB,OSM, OSR

SAF, SAM, SM, SSN(M RSN(M

ES1, ES0, FB1, FB0, LE1,LE0, MB0, MB1, MB2, PE1, PE0, SB1,SB0, SE1, SE0, SQ1, SQ0, UL1, UL0,LS1, LS0, LA1, LA0, EL1, EL0, II1, II0,CSB

Command Codes Para. Page

), RCF, RCM,

1-9

)

2-11 2-40

2-12 2-45

2-13 2-47

Configuration Commands

Group Execute Trigger (GET) Commands

List Sweep Commands

Fast-FrequencySwitching Commands

Power-OffsetTable Commands

User Level Calibration Commands

BPN, BPP,EP0, EP1, FRS, PPO, PPC, RC0, RC1, RT0, RT1, RO0, RO1, TR0, TR1

GTC, GTD, GTF, GTL, GTO, GTS,GTT, GTU, Y

LST, ELI(xxxx), ELN(x), LF, LP, LIB(xxxx), LIE(xxxx), AUT, HWT, EXT, TRG, MNT, UP, DN, LEA, CTL

000-999

), ZEL, ZS(X

ZL(X ZPN(bbbb),

ZTL(bbbbnnnnD8D8D8.....D8)

PT0, PT1, PTC, PTL 2-18 2-62

LU0, LU1, LU2, LU3, LU4,LU5, LUS, LUR 2-19 2-65

000-999

2-14 2-52

2-15 2-53

2-16 2-54

2-17 2-58

683XXC PM 2-5 Changed: May 1999

PROGRAMMING WITH DATA INPUT GPIB COMMANDS RESTRICTIONS

Table 2-1. 683XXC GPIB Command Codes Listed by Function (3 of 3)

2-3

DATA INPUT RESTRICTIONS

GPIB Command

Group Function

Master-Slave Operation Commands

Self Test Command

Miscellaneous Commands

S0, S1 2-20 2-73

TST 2-21 2-74

ADD, CS0, CS1, DS0, DS1,RL, RST, SNR 2-22 2-76

Command Codes Para. Page

The 683XXC signal generator does not accept parameter or data entries in an exponential or scientific notation format. The accepted data formats are as follows:

A decimal or integer format for entering parameters and data.

A binary-byte format for entering the status byte mask com-

mands (paragraph 2-13), the RCF and RCM stored-setup commands (paragraph 2-12), the ZTL fast-frequency-switching command (paragraph 2-17), the power-offset-table commands (paragraph 2-18), and the LUR user level calibration command (paragraph 2-19).

Programming Note: The signal generator only recognizes the following 65 characters:

The 52 upper- and lower-case alphabetic characters. (The 682XXC/ 683XXC accepts both upper- and lower-case characters without distinguishing between the cases).

The minus sign (–).

The comma (,).

The decimal point (.).

The numerals between 0 and 9.

All characters other than the 65 listed above are ignored and can be interspersed between meaningful characters without ill effect. This use of other characters can improve readability. For example, the two command strings below are valid and interchangable.

“F12.754GHF27.792GHSF1SWPMK0L12DM” “F1=2.754 GH, F2=7.792 GH, SF1, SWP, MK0, L1=2 DM”

2-6 683XXC PM

PROGRAMMING WITH PARAMETER AND DATA GPIB COMMANDS ENTRY COMMANDS

2-4

PARAMETER AND DATA ENTRY COMMANDS

Table 2-2 lists the command mnemonic codes that open parameters for data entry. The table also provides the range of values permitted for each parameter and the data terminator mnemonic codes for each. Tables 2-3 and 2-4 (pages 2-13 and 2-14) list the data entry and data terminator command mnemonic codes.

Opening a Parameter

Data Entry When a parameter is open for data entry, its value

All of the commands listed in Table 2-2 open a parameter for data entry. Once opened, a parameter remains open until one of the following occurs:

Another parameter is opened.

A function other than video markers, intensity

markers, or output power leveling is commanded. The CLO (close open parameter) command is

received.

can be changed as follows:

By sending a numeric value followed by the appropriate terminator code.

By incrementing or decrementing its value using an associated step size.

NOTE

An appropriate data terminator must be usedtoterminate anumeric-parameterentry, and itmust immediately followthenumeric value. If it doesnot, a parameter entry error will result.

The parameter and data entry commands do not affect the signal generator’s output unless the parameter being changed is also the current output parameter. The commands, therefore, may be used to change the preset values of parameters without altering the 683XXC output.

Example: Assume that the 683XXC is executing an F3-F4 sweep from 3 GHz to 10 GHz. Changing the value of F1 to 3 GHz with the command string “F13GH” does not affect the current output of the signal generator. However, changing the value of F4 with the command string “F4 16.01 GH” alters the output of the 683XXC because it changes the end point of the F3-F4 sweep to 16.01 GHz.

683XXC PM 2-7

PROGRAMMING WITH PARAMETER AND DATA GPIB COMMANDS ENTRY COMMANDS

Table 2-2. Parameter Entry Commands (1 of 5)

MNEMONIC

CODE

F0 F1 F2 F3 F4 F5 F6 F7 F8 F9

M0 M1 M2 M3 M4 M5 M6 M7 M8 M9

XL0 XL1 XL2 XL3 XL4 XL5 XL6 XL7 XL8 XL9

PARAMETER VALUES

Opens the F0 parameter Opens the F1 parameter Opens the F2 parameter Opens the F3 parameter Opens the F4 parameter Opens the F5 parameter Opens the F6 parameter Opens the F7 parameter Opens the F8 parameter Opens the F9 parameter

Opens the M0 parameter Opens the M1 parameter Opens the M2 parameter Opens the M3 parameter Opens the M4 parameter Opens the M5 parameter Opens the M6 parameter Opens the M7 parameter Opens the M8 parameter Opens the M9 parameter

Opens the L0 parameter Opens the L1 parameter Opens the L2 parameter Opens the L3 parameter Opens the L4 parameter Opens the L5 parameter Opens the L6 parameter Opens the L7 parameter Opens the L8 parameter Opens the L9 parameter

Dependent on the frequency range of the instrument

Dependent on the power level range of the instrument

TERMINA-

TOR

GH MH KH

(Logarithmic)

(Linear)

DLF

DFF

DFM

Opens theDF parameter Opens theDF parameter Opens theDF parameter

Dependent on the frequency range of the instrument

GH MH KH

Slave Unit Frequencies

SLF0 SLF1 SLF2 SLF3 SLF4 SLF5 SLF6 SLF7 SLF8 SLF9

Dependent on the frequency range of the instrument

GH MH KH

2-8 683XXC PM

PROGRAMMING WITH PARAMETER AND DATA GPIB COMMANDS ENTRY COMMANDS

Table 2-2. Parameter Entry Commands (2 of 5)

MNEMONIC

CODE

PARAMETER VALUES TERMINATOR

Slave Unit Frequencies

SLM0 SLM1 SLM2 SLM3 SLM4 SLM5 SLM6 SLM7 SLM8 SLM9

SLDF Opens theDF parameter for

SDT Opens the step sweep

SNS Opens the step sweep

SWT Opens the analogsweep,

the slave unit

dwell time parameter

number of steps parameter

step sweep, and CW ramp time parameter

Dependent on the frequency range of the instrument

1msto99s MS

1 to 10,000 SPS

30 ms to 99s MS

GH MH KH

SEC

LOS Opens the level offset

parameter

PDT Opens the power sweep

dwell time parameter

PNS Opens the power sweep

number of steps parameter

ADP1 Opens the internal AM %

depth parameter

ADP2 Opens the internal AM dB

depth parameter

AMR Opens the internalAM rate

parameter

+100 dB to –100 dB DB

1msto99sec MS

SEC

1 to 10,000 SPS

0% to 100% PCT

0dBto25dB DB

0.1 Hz to 1 MHzfor sine wave;

0.1 Hz to 100 kHzfor square, triangle, and ramp waveforms

MH KH

683XXC PM 2-9

PROGRAMMING WITH PARAMETER AND DATA GPIB COMMANDS ENTRY COMMANDS

Table 2-2. Parameter Entry Commands (3 of 5)

MNEMONIC

CODE

AMS Opens the external AM %/V

ASD Opens the external AM

FDV Opens the internal FM

FMR Opens the internal FM rate

FMS Opens the external FM sen-

PARAMETER VALUES TERMINATOR

sensitivity parameter

dB/V sensitivity parameter

deviation parameter

parameter

sitivity parameter

0 %/V to 100 %/V PCV

0 dB/V to 25 dB/V DV

10 kHz to 20 MHzin Locked, Locked LowNoise, and Unlocked Narrow FM; 100 kHz to 100 MHz in Unlocked Wide FM

0.1 Hz to 1 MHzfor sine wave;

0.1 Hz to 100 kHzfor square, triangle, and ramp waveforms

10 kHz/V to

20 MHz/V in Locked, Locked Low-Noise, and Unlocked Narrow FM;±100 kHz/V to

100 MHz/V in Unlocked Wide FM

KH HZ

PHD Opens the internalFM

deviation parameter

PHR Opens the internalFM rate

parameter

PHS Opens the externalFM

sensitivity parameter

PER Opens the internal pulse

period parameter

0.0025 to 5 radians in

M Narrow mode;

0.25 to 500 radians in

M Wide mode

0.1 Hz to 1 MHzfor sine wave;

0.1 Hz to 100 kHzfor square, triangle, and ramp waveforms

0.0025 radians/V to

5 radians/V inFM Narrow mode;

0.25 radians/V to

500 radians/V inFM Wide mode

250 ns to 419 msat 40 MHz pulse clock rate; 600 ns to 1.6sat 10 MHz pulse clock rate

KH HZ

SEC

US NS

2-10 683XXC PM

PROGRAMMING WITH PARAMETER AND DATA GPIB COMMANDS ENTRY COMMANDS

Table 2-2. Parameter Entry Commands (4 of 5)

MNEMONIC

CODE

PR Opens the internal pulse

PW, W1

W2 W3 W4

PDY, D1 Opens the internal pulse

D2 D3 D4

PARAMETER VALUES TERMINATOR

frequency parameter

Opens the internal pulse width 1 parameter Opens the internal pulse width 2 parameter Opens the internal pulse width 3 parameter Opens the internal pulse width 4 parameter

delay 1 parameter

Opens the internal pulse delay 2 parameter Opens the internal pulse delay 3 parameter Opens the internal pulse delay 4 parameter

2.385 Hz to 4 MHzat 40 MHz pulse clock rate;

0.597 Hz to 1.66 MHz at 10 MHz pulse clock rate

25 ns to 419 msat 40 MHz pulse clock rate; 100 ns to 1.6sat 10 MHz pulse clock rate

0 to 419 ms at 40 MHz pulse clock rate; 0 to 1.6 sat 10 MHz pulse clock rate

100 ns to 419 msat 40 MHz pulse clock rate; 300 ns to 1.6sat 10 MHz pulse clock rate

KH HZ

SEC

US NS

SEC

US NS

SEC

US NS

SDD Opens the internal pulse

stepped delay mode step size parameter

SDE Opens the internal pulse

stepped delay mode delay 1 stop parameter

SDL Opens the internal pulse

stepped delay mode dwelltime-per-step parameter

SDS Opens the internal pulse

stepped delay mode delay 1 start parameter

0 to 419 ms at 40 MHz pulse clock rate; 0 to 1.6 sat 10 MHz pulse clock rate

100ms to 10s SEC

0 to 419 ms at 40 MHz pulse clock rate; 0 to 1.6 sat 10 MHz pulse clock rate

SEC

US NS

SEC

US NS

SEC

US NS

683XXC PM 2-11

PROGRAMMING WITH PARAMETER AND DATA GPIB COMMANDS ENTRY COMMANDS

Table 2-2. Parameter Entry Commands (5 of 5)

MNEMONIC

CODE

PVT Opens the ALC power

SLP Opens the ALC power

SOF Opens the frequency

SLV, SLL1 Opens the main power level

SLL2 Opens the alternate sweep

EGI Opens the Reference Level

PARAMETER VALUES TERMINATOR

slope pivot point frequency parameter

slope value parameter

offset parameter for the slave unit (in a 360BVNA configuration)

parameter (L1) for the slave unit

power level parameter (L2) for the slave unit

DAC setting parameter (in external power leveling mode)

Dependent on the frequency range of the instrument

0 to 255 SPS

Dependent on the frequency range of the instrument

Dependent on the power level range of the instrument

0 to 255 SPS

DM (Log)

VT (Linear)

DM (Log)

VT (Linear)

ADD Opens the GPIB address

parameter.

FRS Opens the frequency

scaling reference multiplier parameter

LDT Opens the list sweep dwell

time parameter

SYZ Opens the step-size

parameter for updating

UP Increments the open

parameter by the step size

DN Decrements the open

parameter by the step size

CLO Closes the previously

opened parameter

1to30 ADR

0.1 to 14 TMS

1msto99s MS

SEC

Dependent on the open parameter

N/A N/A

N/A

2-12 683XXC PM

PROGRAMMING WITH PARAMETER AND DATA GPIB COMMANDS ENTRY COMMANDS

Table 2-3. Data Entry Commands

MNEMONIC

CODE

0, 1, 2, 3, 4,

5, 6, 7, 8, 9

– Change sign of input

. Decimal point

CLR Clear data entry

Numerals for parameter value entries

DESCRIPTION

683XXC PM 2-13

PROGRAMMING WITH PARAMETER AND DATA GPIB COMMANDS ENTRY COMMANDS

Table 2-4. Data Terminator Codes

MNEMONIC

CODE

ADR GPIBAddress

DB Decibels (dB) DM dBm GH GHz MH MHz

KH kHz

HZ Hertz (Hz)

SEC Seconds

MS Milliseconds (ms)

US Microseconds (ms)

NS Nanoseconds (ns)

PCT Percent (%)

DESCRIPTION

RD Radians GV GHz per volt (GHz/V)

MV MHz per volt(MHz/V)

KV kHz per volt (kHz/V) DV Decibel pervolt (dB/V)

PCV Percent per volt(%/V)

RV Radians per volt (rad/V) SPS Steps TMS Times

VT Volts

2-14 683XXC PM

PROGRAMMING WITH PARAMETER AND DATA GPIB COMMANDS ENTRY COMMANDS

Using the

SYZ

Command

Each 683XXC parameter has an associated step size that can be used to increment or decrement its value. Parameters that have common units share a common step size. For example, the frequency parameters (F0-F9, M0-M9, and DF) have a common step size as do the power level parameters (XL0XL9, L0-L9, and Level Offset). Other parameters, such as analog sweep time, have individual step sizes.

To set the step size for a parameter, first send the command code to open the parameter, then send the SYZ command. Now set the step size by sending a numeric string with the proper terminator. When the terminator is received, the step size is accepted and the original parameter is again open for entry.

Figure 2-1 shows how the SYZ command can be used to increment a parameter. In this example, the F1 frequency parameter is set to 4 GHz, the step size is set to 10 MHz, and F1 frequency is incremented three times by the value of the step size.

F1 4 GH SYZ 10 MH UP UP UP

Sets a step size of 10 MHz, ends the step-size entry, and reopens the F1 parameter.

Opens the step-size parameter for F1.

Sets the F1 Parameter to 4 GHz.

Selects the F1 Parameter and opens it for entry.

Figure 2-1. Using the SYZ (Step Size) Command

Increments F1 from 4.02 GHz to 4.03 GHz.

Increments F1 from 4.01 GHz to 4.02 GHz.

Increments F1 from 4.00 GHz to 4.01 GHz.

683XXC PM 2-15

PROGRAMMING WITH CW FREQUENCY GPIB COMMANDS COMMANDS

2-5

CW FREQUENCY COMMANDS

Table 2-5 lists the CW frequency command mnemonic codes. These commands call up each of the 20 preset (or previously set) CW frequencies. Each command causes its associated CW frequency to be output and opens that frequency’s parameter for data entry.

The command, SQF, accesses the preset frequencies in sequential or- der—that is, F0 to F9 and M0 to M9.

Table 2-5. CW Frequency Commands

MNEMONIC

CODE

CF0 CF1 CF2 CF3 CF4 CF5 CF6 CF7 CF8 CF9

CM0 CM1 CM2 CM3 CM4 CM5 CM6 CM7 CM8 CM9

Set CW mode at F0 Set CW mode at F1 Set CW mode at F2 Set CW mode at F3 Set CW mode at F4 Set CW mode at F5 Set CW mode at F6 Set CW mode at F7 Set CW mode at F8 Set CW mode at F9

Set CW mode at M0 Set CW mode at M1 Set CW mode at M2 Set CW mode at M3 Set CW mode at M4 Set CW mode at M5 Set CW mode at M6 Set CW mode at M7 Set CW mode at M8 Set CW mode at M9

FUNCTION OPENS FOR ENTRY

F0 parameter F1 parameter F2 parameter F3 parameter F4 parameter F5 parameter F6 parameter F7 parameter F8 parameter F9 parameter

M0 parameter M1 parameter M2 parameter M3 parameter M4 parameter M5 parameter M6 parameter M7 parameter M8 parameter M9 parameter

SQF Scan to the next higherpreset

CW frequency.

SQU Scan up to the next higher preset

CW frequency.

SQD Scan down to the next lower pre-

set CW frequency.

ACW Activates the currently scanned

frequency as CW.

CW frequency parameter then selected

2-16 683XXC PM

PROGRAMMING WITH ANALOG AND STEP GPIB COMMANDS SWEEP COMMANDS

Programming Note: Signal generator response to a SQF command depends on the state that the instrument is in at the time the command is received. For example, if the 683XXC is in a CW mode of operation with the current output frequency open for entry, the SQF command (1) causes the output to change to the next sequential frequency and (2) opens that frequency’s parameter for data entry. However, if the instrument is in any other mode of operation, the SQF command causes it to switch to the last CW frequency that was output and opens that parameter for data entry.

Figure 2-2 is an example of a CW frequency command string.

CF1 CF6 7 GH SQF

C loses the F6 param eter. P laces the 683XX C at the preset (or previously set) C W F 7 param eter and opens the F7 param eter for data entry.

2-6

ANALOG AND STEP SWEEP COMMANDS

C loses the F1 param eter. P laces the 683XX C at the preset (or previously set) C W F6 frequency and opens the F6 param eter for data entry. S ets the F6 frequency to 7 G H z.

Places the 683X X C at the preset (or previously set) C W F1 frequency and opens the F1 param eter for data entry.

Figure 2-2. Example of a CW Frequency Command String

Table 2-6 (page 2-19) lists the analog and step sweep command mnemonic codes. These commands are divided into five subclasses and are described in the following paragraphs.

Sweep Range Seven sweep ranges are available. The SF1 and SF3

commands select the sweep ranges of F1-F2 and F3-F4 respectively; the FUL command selects a full band sweep from the signal generator’s low frequency limit to its high frequency limit.

The DF0, DF1, DF5, and DF6 commands each select a symmetrical frequency sweep around F0, F1, F5, and F6 respectively. The width of the sweep is determined by the DF frequency parameter.

683XXC PM 2-17

PROGRAMMING WITH ANALOG AND STEP GPIB COMMANDS SWEEP COMMANDS

Programming Examples:

Programming “F12GHF28GHSF1” sets F1 to 2 GHz, F2 to 8 GHz, and implements a F1-F2 frequency sweep.

Programming “DLF6GHF57GHDF5” sets DFto 6 GHz, F5 to 7 GHz, and implements a F5-DF frequency sweep.

Programming Note:

If the commanded sweep range is invalid, a parameter error (paragraph 2-23) will be generated, and the output of the signal generator will not be altered.

A sweep range is invalid if (1) the analog sweep start frequency is greater than the stop frequency, or (2) the DF frequency parameter results in a sweep that is outside the range of the instrument.

Alternate Sweep

Sweep Triggering

Six alternate sweep commands are available. If the 683XXC is sweeping when the alternate sweep command is received, the signal generator’s output will alternate between the commanded sweep and the sweep then being executed.

Programming Example:

Assume that the 683XXC had been previously programmed and was then executing an F1-F2 sweep. Programming “AF3” would then activate the F3-F4 sweep and cause it to alternate with the F1-F2 sweep.

Programming Note:

An alternate sweep command will only be recognized when the 683XXC has been programmed to sweep. It will be ignored at all other times.

Two modes of sweep triggering are available over the bus—Automatic, External, and Single. The AUT command selects automatic sweep triggering; the HWT command selects external triggering; the EXT command selects single sweep triggering.

When automatic sweep triggering is selected, the sweep continually sweeps from its start frequency (or power level) to its stop frequency (or power level) with optimal retrace time.

2-18 683XXC PM

PROGRAMMING WITH ANALOG AND STEP GPIB COMMANDS SWEEP COMMANDS

When external sweep triggering is selected, a single sweep occurs when triggered by an external TTLcompatible clock pulse to the rear panel AUX I/O connector.

When single sweep triggering is selected, a single sweep starts when the TRG or TRS command is received. The RSS command resets the sweep to its start frequency (or power level), whenever the command is received while a single sweep is in progress.

Table 2-6. Analog and Step Sweep Commands

MNEMONIC

CODE

SF1 SF3 FUL DF0 DF1 DF5 DF6

AFU

AF1

AF3 AD1 AD5 AD6

AUT

HWT

EXT TRG TRS RSS

FUNCTION

Sweep Range

Selects the F1-F2 sweep mode Selects the F3-F4 sweep mode Selects the Full Range sweepmode Selects the F0-DF sweep mode Selects the F1-DF sweep mode Selects the F5-DF sweep mode Selects the F6-DF sweep mode

Alternate Sweep

Selects Full Range alternate sweep Selects F1-F2 alternate sweep Selects F3-F4 alternate sweep Selects F1-DF alternate sweep Selects F5-DF alternate sweep Selects F6-DF alternate sweep

Sweep Triggering

Selects Auto Trigger Selects External Trigger Selects Single Trigger Triggers a Single Sweep Triggers a Single Sweep Resets a Sweep if inprogress

OPENS FOR

ENTRY

None None None None None None None

None None None None None None

Analog/Step Sweep Select

SWP

SSP

LIS

LGS

MAN

DU1 DU0 TSS

SP1 SP0

Selects Analog Sweep Selects Step Sweep (Linear) Selects Linear Step Sweep (DefaultMode) Selects Logarithmic Step Sweep Selects Manual (Step) Sweep Selects Dual Step Sweep mode Deselects Dual Step Sweep mode Steps to next point inDU1 mode

Special Step Sweep (Steps Not Equally Spaced)

Selects non-equally spaced step sweep Deselects non-equally spaced step sweep

None None None None None None None None

None None

683XXC PM 2-19

PROGRAMMING WITH ANALOG AND STEP GPIB COMMANDS SWEEP COMMANDS

Analog/Step Sweep Select

Five commands are available—SWP selects an analog sweep, SSP and LIS select a linear step sweep, LGS selects a logarithmic step sweep, and MAN selects a manual (step) sweep. The selected sweep mode applies to all sweep ranges. Figure 2-3 shows an example of a sweep command string.

Programming Notes:

Commanding either SWP or SSP does not, by itself, provide a swept-frequency output. It only determines whether the swept-frequency output will be an analog or step sweep. If, on the other hand, a frequency sweep is being output by the signal generator when one of these commands is received, that sweep will assume the commanded sweep mode.

The MAN command only provides for setting up the 683XXC for a manual sweep. It must be accompanied by the RL command to return the instrument to local (front panel) control in order for the operator to perform the manual sweep.

AUT SWP EXT TRS SSP TRSSF1

Selects analog sweep.

Selects Auto triggering.

Selects the F1-F2 sweep range.

Figure 2-3. Example of a Sweep Command String

Triggers a single sweep.

Selects linear step sweep.

Triggers a single sweep.

Selects the Single triggering mode.

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PROGRAMMING WITH ANALOG AND STEP GPIB COMMANDS SWEEP COMMANDS

Dual Step Sweep Mode

The dual step sweep mode provides for generating synchronized, step sweep outputs from two 683XXCs at a frequency offset. Figure 2-4 shows an example of dual step sweep programming.

10 ! “DUAL” 20 CLEAR 30 DISP “ENTER # OF STEPS” 40 INPUT S 50 DISP “ENTER WAIT TIME [mS] 60 INPUT W 70 WAIT 100 80 DISP “ENTER ‘LO’ START FREQ [GHz]”

90 INPUT F1 100 DISP “ENTER ‘LO’ STOP FREQ [GHz] 110 INPUT F2 120 DISP “ENTER OFFSET [GHz] 130 INPUT F3 140 ! 150 ! Initialize both 683XXC’s 160 ! 170 OUTPUT 705 ;"CF1F1";F1;"GHF2";F2;

“GHSNS”;S;"SPSSSPEXTCLO"

180 OUTPUT 706 ;"CF1F1";F1+F3;"GHF2";

F2+F3;"GHSNS";S;"SPSSSPEXTCLO" 190 WAIT 1000 200 ! 210 ! Set both to dual mode and enable

GET to end DWELL 220 ! 230 SEND 7 ; CMD “%&” DATA “GTLDU1SF1"

EOL 240 WAIT 100 250 ! Trigger the sweep and wait for

retrace to finish 260 SEND 7 ; CMD “%&” DATA “TRS” EOL 270 WAIT 100 280 ! Listen address both 683XXC’s 290 SEND 7 ; CMD “%&” 300 FOR C+1 TO S+1 310 WAIT W 320 ! Trigger both to next point 330 TRIGGER 7 340 NEXT C 350 GOTO 260

Figure 2-4. Dual Step Sweep Programming Example

683XXC PM 2-21

PROGRAMMING WITH FREQUENCY GPIB COMMANDS MARKER COMMANDS

Special Step Sweep

For this example, assume afrequency sweep of 3 GHz to 10 GHz, with steps at 3, 6, 8, 9, and 10GHz.

Sample Coding in BASIC

10 OUTPUT 705; “ZL000 3GH 6GH 8GH 9GH 10GH ZEL” 20 OUTPUT 705; “F1 3GH F2 10GH SNS 4SPS” 30 OUTPUT 705; “SP1 SSP SF1"

This special step sweep provides for a step sweep that has non-equally spaced steps. It can be used in any of the available sweep ranges (F1-F2, F3-F4, Full, F0-DF, F1-DF, F5-DF, and F6-DF). The start frequency in this sweep must be equal to the first frequency programmed with the ZL(X (Table 2-17). The intermediate steps can be programmed to be any frequency within the range of the programmed sweep.

Programming Note:

The SP1 command can be used with the dual step sweep mode.

Figure 2-5 shows an example of special step sweep programming.

000-999

) command

2-7

FREQUENCY MARKER COMMANDS

Explanation of Code

Line 10 sets up thestep frequencies. Line 20 sets start andstop frequencies and number of steps (frequency points – 1). Line 30 set the signalgenerator to SP1, Step Sweep, and F1-F2 sweep range.

Figure 2-5. Special Step Sweep Programming Example

Table 2-7 lists the frequency marker command mnemonic codes. These commands provide for (1) selecting a CW frequency as a potential marker, (2) selecting a potential marker as an active marker, and (3) individually turning markers on and off.

The ME1 command will enable a marker at the current frequency that is open for update; the ME0 command will disable the same marker. If a frequency parameter is not open, no action will be taken. The IM1 and VM1 commands will turn on their respective intensity and video markers. The MK0 command will turn all markers off.

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PROGRAMMING WITH FREQUENCY GPIB COMMANDS MARKER COMMANDS

Figure 2-6 shows an example of a frequency marker command string.

Table 2-7. Frequency Marker Commands

MNEMONIC

CODE

ME1 Enables a marker at theactive frequency

ME0 Disables the marker at theactive frequency None MK0 Turns off markers. Enabled markers remain

IM1 Turns on the intensitymarker mode None

VM1 Turns on the video marker mode None

Programming Note: Only one marker mode can be active. Consequently, if the intensity marker mode is active and the video marker mode is programmed, the displayed markers will change to video markers. Either mode can be turned off with the MK0 command.

VM1 F1 ME0 F7 ME1 F4 ME1 MK0

FUNCTION

(F0-F9 or M0-M9)

enabled, but are not active

Turns both m arkers off, but leaves the F7 and F4 m arkers enabled. T herefore, w hen V M 1 is next program m ed, tw o frequency m arkers w ill reappear on the display  provided their frequencies are w ithin the 683X X C 's sw eep range.

OPENS FOR

ENTRY

None

Enables the F4 frequency m arker.

Enables the F7 frequency m arker.

D isables the F1 frequency m arker.

Turns on the video-m arker m ode.

Figure 2-6. Example of a Frequency Marker Command String

683XXC PM 2-23

PROGRAMMING WITH OUTPUT POWER GPIB COMMANDS LEVELING COMMANDS

2-8

OUTPUT POWER LEVELING COMMANDS

Table 2-8 lists the output power leveling command mnemonic codes. These commands provide for (1) selecting linear or logarithmic power level operation, (2) selecting an RF output power level, (3) leveling the output power, and (4) turning the output power leveling off. In addition, commands are provided for the level offset, power level sweep, ALC power slope, and step attenuator decoupling functions. Figure 2-7 (page 2-27) shows an example of an output power level command string.

Linear or Logarithmic Power Level Selection

RF Output Power Level Selection

Power level operations can be linear or logarithmic. The command, LOG, selects logarithmic power level operation. In logarithmic mode, power level entries and outputs are in dBm and power level sweeps are logarithmic. This is the default mode.

The command, LIN, selects linear power level operation. In linear mode, power level entries and outputs are in mV and power level sweeps are linear.

The commands, L0 thru L9, call up each of the preset (or previously set) output power levels. Each command causes its associated RF power level to be output and opens that power level’s parameter for data entry. Each command will also deselect any other previously programmed power level and will turn off a power level sweep, if active.

Alternate Sweep RF Output Power Level Selection

Output Power Leveling

In the alternate sweep mode, the commands, AL0 thru AL9, call up each of the preset (or previously set) L0 to L9 output power levels. Each command causes its associated RF power level to be output during the alternate sweep. Each command will also deselect any other previously programmed alternate sweep power level. The commands do not open the L1 to L9 power level parameters for data entry. Use the parameter entry commands, XL0 thru XL9 or L0 thru L9, to enter new power level values.

There are three output power leveling modes of operation—internal, external (detector or power meter), and fixed gain (leveling off). The IL1 command selects the internal leveling mode. In this mode, a signal from an internal level detector is used to level the output power. This is the default mode.

The DL1 command selects the external (detector) leveling mode; the PL1 command selects the external (power meter) leveling mode. In this mode, the output power is leveled using a signal from an

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PROGRAMMING WITH OUTPUT POWER GPIB COMMANDS LEVELING COMMANDS

external detector (power meter) connected to the EXTERNAL ALC IN connector. In the external power leveling mode, the parameter entry command EGI provides for entering a setting for the Reference Level DAC to control the ALC gain. The LV0 command selects the fixed gain (leveling off) mode. Each command will also deselect any other previously programmed output power leveling mode.

Programming Example:

Programming “PL1 EGI 140 SPS” selects external leveling of the output power using a signal from an external power meter and sets the Reference Level DAC to 140.

Table 2-8. Power Leveling Commands (1 of 2)

MNEMONIC

CODE

LOG Selects logarithmic power level operation.

(This is the default mode.)

LIN Selects linear power level operation. None

L0 L1 L2 L3 L4 L5 L6 L7 L8 L9

AL0 AL1 AL2 AL3 AL4 AL5 AL6 AL7 AL8 AL9

Set RF output power levelto L0 Set RF output power levelto L1 Set RF output power levelto L2 Set RF output power levelto L3 Set RF output power levelto L4 Set RF output power levelto L5 Set RF output power levelto L6 Set RF output power levelto L7 Set RF output power levelto L8 Set RF output power levelto L9

Set alternate sweep RF outputlevel to L0 Set alternate sweep RF outputlevel to L1 Set alternate sweep RF outputlevel to L2 Set alternate sweep RF outputlevel to L3 Set alternate sweep RF outputlevel to L4 Set alternate sweep RF outputlevel to L5 Set alternate sweep RF outputlevel to L6 Set alternate sweep RF outputlevel to L7 Set alternate sweep RF outputlevel to L8 Set alternate sweep RF outputlevel to L9

FUNCTION

OPENS FOR

ENTRY

None

L0 L1 L2 L3 L4 L5 L6 L7 L8 L9

None None None None None None None None None None

RF1 Turns on the RF output. (This is the default

mode.)

RF0 Turns off the RF output. None

None

683XXC PM 2-25

PROGRAMMING WITH OUTPUT POWER GPIB COMMANDS LEVELING COMMANDS

Table 2-8. Power Leveling Commands (2 of 2)

MNEMONIC

CODE

LO1 Turns on the Level Offset function. The value of

the Level Offset parameter is added to the level measured by the internal levelingloop. The resultant power level value isdisplayed.

LO0 Turns off the Level Offset function. None

IL1 Selects internal leveling of the output power.

(This is the default mode.) Deselects the DL1 or PL1leveling modes, if previously programmed.

DL1 Selects external leveling of the output power,

using a signal from anexternal detector connected to the EXTERNAL ALC IN connector. Deselects the IL1 or PL1leveling modes, if previously programmed.

PL1 Selects external leveling of theoutput power us-

ing a signal from anexternal power meter connected to the EXTERNAL ALC IN connector. Deselects the IL1 and DL1levelingmodes, if previously programmed.

FUNCTION

OPENS FOR

ENTRY

None

ELF Selects front panel external leveling input. None

ELR Selects rear panel external leveling input. None

LV0 Turns off leveling of the output power. None

LSP Selects thePower Sweep mode. The power

level will sweep as determinedby the preset (or previously set) dwell-time and number-of-steps parameters.

AT1 Selects ALC step attenuator decoupling. None AT0 Deselects ALC step attenuator decoupling. None

ATT(xx) Sets step attenuator value to xx (´10 dB) in the

ALC step attenuator decouple mode.xx is an unsigned integer between 00 (0dB attenuation) and 11 (110 dB attenuation).

SL1 Turns on the ALC power slope function. None SL0 Turns off the ALC power slopefunction. None

EGO Outputs the value of the Reference Level DAC

setting in external power levelingmode

None

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PROGRAMMING WITH OUTPUT POWER GPIB COMMANDS LEVELING COMMANDS

ALC Power Slope

Attenuator Decoupling

The ALC power slope function provides for linearly increasing or decreasing output power as the frequency increases to compensate for system, cable, and waveguide variations due to changes in frequency. The SL1 command turns on the ALC power slope function. The power slope value and the pivot point frequency are changed using the SLP and PVT parameter entry commands. The SL0 command turns off the ALC power slope function.

Programming Example:

Programming “SL1 SLP 128 SPS PVT 2.0 GH” turns on the ALC power slope function and sets the power slope value to 128 and the pivot point frequency to 2 GHz.

The attenuator decoupling function provides for decoupling of the step attenuator (if equipped) from the ALC system. The AT1 command decouples the step attenuator, the ATT(xx) command provides for setting the attenuation in 10 dB increments, and the AT0 command deselects the attenuator decoupling function.

Programming Example:

Programming “AT1 ATT08” decouples the step attenuator from the ALC system and sets the step attenuator value to 80 dB.

RF0 L1 2 DM L2 12 DM PNS 10 SPS LSP RF1

Turns the RF output on.

Selects a level sweep.

Selects a power sweep and 10 steps.

Selects Level 2 and sets it for 12 dBm.

Selects Level 1 and sets it for 2 dBm.

Turns the RF output off.

Figure 2-7. Example of an Output Power Level Command String

683XXC PM 2-27

PROGRAMMING WITH MODULATION GPIB COMMANDS COMMANDS

2-9

MODULATION COMMANDS

Table 2-9 (page 2-33) lists the modulation command mnemonic codes. These commands provide for AM, FM, FM, and pulse modulation of the signal generator’s output signal using modulating signals from either the internal AM, FM, FM, and pulse generators or an external source.

Amplitude Modulation

Two AM modes are available—Linear and Log. In Linear AM mode, sensitivity is variable from 0 %/V to 100 %/V and the amplitude of the RF output changes linearly as the AM input changes. In Log mode, sensitivity is variable from 0 dB/V to 25 dB/V and the amplitude of the RF output changes exponentially as the AM input changes.

Internal AM Function

The AM7 command turns on the internal AM function in Linear mode. The AM8 command turns on the internal AM function in Log mode. In Linear mode, the AM depth value is changed using the ADP1 parameter entry command. In Log mode, the AM depth value is changed using the ADP2 parameter entry command. The modulating waveform is selected using the AMW(x) command and the AM rate is set with the AMR command. The AM0 command turns off the AM function.

Programming Example:

Programming “AM8 ADP2 20 DB AMW7 AMR 10 KH” turns on the internal AM function in Log mode,

sets the AM depth to 20 dB, selects a triangle wave as the modulating waveform, and sets the AM rate to 10 kHz.

External AM Function

The AM1 command turns on the external AM function in Linear mode. The AM2 command turns on the external AM function in Log mode. In Linear mode, the external AM sensitivity value is changed using the AMS parameter entry command. In Log mode, the external AM sensitivity value is changed using the ASD parameter entry command. The AM0 command turns off the AM function.

Programming Example:

Programming “AM1 AM3 AM5 AMS 90 PCV” turns on the external AM function in Linear mode, selects the front panel external AM input, selects an input impedance of 50W, and sets the external AM sensitivity to 90 %/V.

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PROGRAMMING WITH MODULATION GPIB COMMANDS COMMANDS

Frequency Modulation

Four FM modes are available—Locked, Locked Low-Noise, Unlocked Narrow, and Unlocked Wide.

In the Locked and Locked Low-Noise FM modes, frequency modulation of the output signal is accomplished by summing the modulating signal into the FM control path of the YIG phase-lock loop. In Locked FM mode, the maximum FM deviation is the lesser of ±10 MHz or rate ´ 300 for 1 kHz to 8 MHz rates; in Locked Low-Noise FM mode, the maximum FM deviation is the lesser of ±10 MHz or rate ´ 3 for 50 kHz to 8 MHz rates.

In the Unlocked FM modes, the YIG phase-lock loop is disabled to allow for peak FM deviations of up to 100 MHz. In the Unlocked Narrow FM mode, frequency modulation is obtained by applying the modulating signal to the fine tuning coil of the YIGtuned oscillator. Unlocked Narrow FM mode allows maximum deviations of ±10 MHz for DC to 8 MHz rates.

In the Unlocked Wide FM mode, frequency modulation is accomplished by applying the modulating signal to the main tuning coil of the YIG-tuned oscillator. Unlocked Wide FM mode allows maximum deviations of ±100 MHz for DC to 100 Hz rates.

Internal FM Function

The FM7 command turns on the internal FM function in Unlocked Narrow mode, the FM8 command turns it on in Unlocked Wide mode, the FM9 command turns it on in Locked mode, and the FMN command turns it on in Locked Low-Noise mode. The FM deviation value is changed using the FDV parameter entry command. The modulating waveform is selected using the FWV(x) command and the internal FM rate is set using the FMR parameter entry command. The FM0 command turns off the FM function.

Programming Example:

Programming “FM9 FDV 20 MH FWV1 FMR 100 KH” turns on the internal FM function in Locked

mode, sets the FM deviation to 20 MHz, selects a sine wave as the modulating waveform, and sets the FM rate to 100 kHz.

683XXC PM 2-29

PROGRAMMING WITH MODULATION GPIB COMMANDS COMMANDS

External FM Function

The FM1 (or FMU) command turns on the external FM function in Unlocked Narrow mode, the FMW command turns it on in Unlocked Wide mode, the

FML command turns it on in Locked mode, and the FM2 command turns it on in Locked Low-Noise

mode. The external FM sensitivity value is changed using the FMS parameter entry command. The FM0 command turns off the FM function.

Programming Example:

Programming “ FMW FM4 FM6 FMS 50 MV” turns on the external FM function in Unlocked Wide mode, selects the rear panel FM input, selects an input impedance of 600W, and sets the external FM sensitivity to 50 MHz/V.

NOTE

If the FMfunction (Option 6) isnot installed in the signal generator, the FM function commands produce syntax errors.

Phase Modulation

Two FM modes are available—Narrow and Wide. In Narrow FM mode, the maximum FM deviation is the lesser of ±3 radians or ±5 MHz/rate for DC to 8 MHz rates. In Wide FM mode, the maximum FM deviation is the lesser of ±400 radians or ±10 MHz/rate for DC to 1 MHz rates.

Internal FM Function

The PH7 command turns on the internal FM function in Narrow mode and the PH8 command turns it on in Wide mode. The PHD parameter entry command is used to change the FM deviation value. The modulating waveform is selected with the PHV(x) command and the FM rate is set using the PHR parameter entry command. The PH0 command turns off the FM function.

Programming Example:

Programming “PH7 PHD 3 RD PHV1 PHR 200 KH” turns on the internal FM function in Narrow mode, sets the FM deviation to 3 radians, selects a sine wave as the modulating waveform, and sets the FM rate to 200 kHz.

External FM Function

The PH1 (or PHN) command turns on the external FM function in Narrow mode and the PH2 (or PHW) command turns it on Wide mode. The external FM sensitivity value is changed using the PHS parameter entry command. The PH3 and PH4 commands select front panel or rear panel external FM input.

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PROGRAMMING WITH MODULATION GPIB COMMANDS COMMANDS

Programming Example

Programming “PH2 PH4 PH5 PHS 50 RV” turns on the external FM function in Wide mode, selects the rear panel FM input, selects an input impedance of 50W, and sets the external FM sensitivity to 50 radians/V.

Pulse Modulation

Two pulse modulation modes are available—Internal and External. In Internal mode, pulse modulation of the output signal is accomplished by using a modulating signal from the internal pulse generator. In External mode, pulse modulation of the output signal is achieved using a modulating signal from an external source.

The internal pulse generator has four pulse modes —single, doublet (double pulse), triplet (triple pulse), and quadruplet (quadruple pulse). Individual pulse widths and delays can be set for each of the pulses in a mode. The pulse generator has two clock rates—40 MHz and 10 MHz. The 40 MHz clock rate produces higher resolution pulses (25 ns) and allows higher PRFs; the 10 MHz clock rate produces lower resolution pulses (100 ns) and lower PRFs.

The internal pulse generator can be internally triggered, externally triggered, internally and externally triggered with delay, and gated. There is also a composite trigger mode in which an external pulse is summed with the internal pulse to pulse modulate the output signal. (Refer to Chapter 3 of the 683XXC Operation Manual for a description of each trigger mode.)

Internal Pulse Modulation Function

The IPcommand turns on the internal pulse modu-

NOTE

At a 40 MHz pulse clock rate, the pulse period mustbe 125 ns longer than the pulse widths + delays;at a 10 MHz pulse clock rate, the pulse period must be 500 ns longer than the pulse widths + delays.

lation function. The internal pulse mode is selected using the PMD(x) command and the internal pulse trigger is selected using the PTG(x) command. The pulse period can be set using the PER parameter entry command; the pulse frequency can be set using the PR parameter entry command. Individual pulse widths can be set using the W1 (or PW), W2, W3, and W4 parameter entry commands. Individual pulse delays can be set using the D1 (or PDY), D2,

D3, and D4 parameter entry commands. The P0 (or SW0) command turns off the pulse modulation func-

tion.

683XXC PM 2-31

PROGRAMMING WITH MODULATION GPIB COMMANDS COMMANDS

Square wave pulse modulation of the output signal by one of four internal modulating signals is available using the following commands:

SW1 turns on square wave pulse modulation

at 400 Hz. SW2 (or SQP) turns on square wave pulse

modulation at 1 kHz. SW3 turns on square wave pulse modulation

at 7.8125 kHz. SW4 turns on square wave pulse modulation

at 27.8 kHz.

NOTE

Use the EP0and EP1 commands to select the polarity of the signal (TTL-low or TTL-high) that turns theRFonduringpulsemodulation.

Programming Example:

Programming “IP PC4 PMD2 PTG1 PER 1 MS W1

2.5 US D2 10 US W2 2 US” turns on the internal

pulse modulation function; selects the 40 MHz pulse clock rate, doublet pulse mode, and free run trigger mode; and sets the pulse period to 1 ms, pulse width1 to 2.5 ms, delay2 to 10 ms, and pulse width2 to 2 ms.

Stepped Delay Mode

The stepped delay mode automatically increments or decrements the pulse delay 1 value according to step delay parameters. Stepped delay mode is only available when the triggering commands PTG3 (delayed) or PTG5 (triggered with delay) are specified. The SD1 command turns on the stepped delay mode. The pulse delay 1 start time can be set using the SDS parameter entry command; the delay 1 stop time can be set using the SDE parameter entry command. Use the SDD parameter entry command to set the step size and the SDLparameter entry command to set the dwell-time-per-step. The SD0 command turns off the stepped delay mode.

Programming Notes:

Use the PTR and PTF commands in conjunction with the pulse trigger commands PTG2 (gated), PTG4 (triggered), and PTG5 (triggered with delay) to specify whether the pulse generator is triggered by the rising or falling edge of the external trigger pulse. Use the P3 (or SW5) and P4 (or SW6) commands to select front panel or rear panel external trigger pulse input.

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PROGRAMMING WITH MODULATION GPIB COMMANDS COMMANDS

External Pulse Modulation Function

The XPcommand turns on the external pulse modulation function. The P3 (or SW5) and P4 (or SW6) commands select front panel or rear panel external pulse input. The PO (or SW0) command turns off the pulse modulation function.

Table 2-9. Modulation Commands (1 of 6)

MNEMONIC

CODE

AM0 Turns off the internal or externalAM function.

(This is the default mode.)

AM1 Turns on theexternal AM function in Linear mode.

Disables the internal AM functionor the external AM function in Log mode, had either ofthese modes been previously programmed.

AM2 Turns on theexternal AM function in Log mode.

Disables the internal AM functionor the external AM function in Linear mode, had either ofthese modes been previously

programmed. AM3 Selects front panel external AM input. AM4 Selects rear panel external AM input. AM5 Selects external AM input impedance of 50W. AM6 Selects external AM input impedance of 600W. AM7 Turns on theinternal AM function in Linear mode.

Disables the external AM functionor the internal AM function in

Log mode, had either ofthese modes been previously

programmed.

FUNCTION

AM8 Turns on theinternal AM function in Log mode.

Disables the external AM functionor the internal AM function in

Linear mode, had either ofthese modes been previously

programmed.

AMW(x) Selects the internalAM waveform, where x = 1-sine wave,

2-square wave, 3-positive ramp, 4-negativeramp,

5-Gaussian noise, 6-uniform noise, 7-trianglewave. FM0 Turns off the internal or external FM function.

(This is the default mode.)

683XXC PM 2-33

PROGRAMMING WITH MODULATION GPIB COMMANDS COMMANDS

Table 2-9. Modulation Commands (2 of 6)

MNEMONIC

CODE

FM1 Turns on the external FM function in Unlocked Narrow mode.

(The signal generator output isnot phase-locked.) Disables the internal FM functionor the external FM function in Unlocked Wide, Locked, or LockedLow-Noise mode, had any of these modes been previouslyprogrammed.

FM2 Turns on the external FM function in Locked Low-Noise mode.

(The signal generator output isphase-locked.) Disables the internal FM function or theexternal FM function in Unlocked Narrow, Unlocked Wide, or Locked mode, had any of these

modes been previously programmed. FM3 Selects front panel external FM input. FM4 Selects rear panel external FM input. FM5 Selects external FM input impedance of 50W. FM6 Selects external FM input impedance of 600W. FM7 Turns on the internal FM function in Unlocked Narrow mode.

(The signal generator output isnot phase-locked.)

Disables the external FM functionor the internal FM function in

Unlocked Wide, Locked, or LockedLow-Noise mode, had any

of these modes been previouslyprogrammed.

FUNCTION

FM8 Turns on the internal FM function in Unlocked Wide mode.

(The signal generator is notphase-locked.)

Disables the external FM functionor the internal FM function in

Unlocked Narrow, Locked, or Locked Low-Noise mode, had any

of these modes been previouslyprogrammed. FM9 Turns on the internal FM function in Locked mode. (The signal

generator output is phase-locked.)

Disables the external FM functionor the internal FM function in

Unlocked Narrow, Unlocked Wide, or Locked Low-Noise mode,

had any of these modesbeen previously programmed.

FMN Turns on the internal FM function in Locked Low-Noise mode.

(The signal generator is phase-locked.)

Disables the external FM functionor the internal FM function in

Unlocked Narrow, Unlocked Wide, or Locked mode, had any of

these modes been previously programmed.

FMW Turns on the external FM function in Unlocked Wide mode.

(The signal generator output isnot phase-locked.)

Disables the internal FM functionor the external FM function in

Unlocked Narrow, Locked, or Locked Low-Noise mode, had any

of these modes been previouslyprogrammed.

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PROGRAMMING WITH MODULATION GPIB COMMANDS COMMANDS

Table 2-9. Modulation Commands (3 of 6)

MNEMONIC

CODE

FML Turns on the external FM function in Locked mode.

(The signal generator output isphase-locked.) Disables the internal FM functionor the external FM function in Unlocked Narrow, Unlocked Wide, or Locked Low-Noise mode, had any of these modesbeen previously programmed.

FMU Same as FM1. Turns on the external FM function inUnlocked

Narrow mode. (The signal generatoroutput is not phaselocked.) Disables the internal FMfunction or the external FM function in Unlocked Wide, Locked, or Locked Low-Noise mode, had any of thesemodes been previously programmed.

FWV(x) Selects the internal FM waveform, where x = 1-sine wave,

2-square wave, 3-positive ramp, 4-negativeramp, 5-Gaussian noise, 6-uniform noise, 7-trianglewave

PH0 Turns off the internal or externalFM function. (This is the

default mode.) If theFM function (Option 6) isnot installed, this command produces a syntax error.

PH1 Turns onthe externalFM function in Narrow mode.

Disables the internal in Wide mode, had eitherof these modes been previously programmed. If theFM function (Option 6) isnot installed, this command produces a syntax error.

FUNCTION

M function or the externalFM function

PH2 Turns onthe externalFM function in Wide mode.

Disables the internalFM function or the externalFM function in Narrow mode, had eitherof these modes been previously programmed. If theFM function (Option 6) isnot installed, this command produces a syntax error.

PH3 Selects front panel externalFM input.

If theFM function (Option 6) isnot installed, this command produces a syntax error.

PH4 Selects rear panel externalFM input.

If theFM function (Option 6) isnot installed, this command produces a syntax error.

PH5 Selects externalFM input impedance of 50W.

If theFM function (Option 6) isnot installed, this command produces a syntax error.

683XXC PM 2-35

PROGRAMMING WITH MODULATION GPIB COMMANDS COMMANDS

Table 2-9. Modulation Commands (4 of 6)

MNEMONIC

CODE

PH6 Selects externalFM input impedance of 600W.

If theFM function (Option 6) isnot installed, this command produces a syntax error.

PH7 Turns onthe internalFM function in Narrow mode.

Disables the externalFM function or the internalFM function in Wide mode, had either ofthese modes been previously programmed. If theFM function (Option 6) isnot installed, this command produces a syntax error.

PH8 Turns onthe internalFM function in Wide mode.

Disables the externalFM function or the internalFM function in Narrow mode, had either ofthese modes been previously programmed. If theFM function (Option 6) isnot installed, this command produces a syntax error.

PHN Same as PH1. Turns on theexternalFM function in Narrow

mode. Disables the internal function in Wide mode, hadeither of these modes been previously programmed. If theFM function (Option 6) isnot installed, this command produces a syntax error.

FUNCTION

M function or the externalFM

PHW Same as PH2.Turns on the externalFM function in Wide

mode. Disables the internalFM function or the externalFM function in Narrow mode, hadeither of these modes been previously programmed. If theFM function (Option 6) isnot installed, this command produces a syntax error.

PHV(x) Selects the internalFM waveform, where x = 1-sine wave,

2-square wave, 3-positive ramp, 4-negativeramp, 5-Gaussian noise, 6-uniform noise, 7-trianglewave If theFM function (Option 6) isnot installed, this command produces a syntax error.

P0 Turns off the internal or external pulse modulation function.

(This is the default mode.)

IP Turns on the internal pulse modulation function.

Disables the external pulse modulationfunction, if previously programmed.

XP Turns on the external pulse modulation function.

Disables the internal pulse modulationfunction, if previously programmed.

2-36 683XXC PM

PROGRAMMING WITH MODULATION GPIB COMMANDS COMMANDS

Table 2-9. Modulation Commands (5 of 6)

MNEMONIC

CODE

P3 Selects frontpanel external pulse input to pulse modulate the

RF output signal or totrigger or gate the internal pulse generator.

P4 Selects rearpanel external pulse input to pulse modulate the

RF output signal or totrigger or gate the internal pulse

generator. PC1 Selects the 10 MHz internal pulse generator clock rate. PC4 Selects the 40 MHz internal pulse generator clock rate.

PMD(x) Selects the internal pulse mode, where x = 1-single, 2-doublet,

3- triplet, 4-quadruplet.

PTG(x) Selects the internal pulse trigger, where x = 1-free run, 2-gated,

3-delayed, 4-triggered, 5-triggered with delay, 6-composite. PTR Selects internal pulse triggering on the risingedge of an

external input. Active only whenpulse trigger is gated,

triggered, or triggered with delay. PTF Selects internal pulse triggering onthe falling edge of an

external input. Active only whenpulse trigger is gated,

triggered, or triggered with delay.

FUNCTION

GP Sets the internal pulse mode to single, the internal pulse trigger

to gated, and turns onthe internal pulse modulation function.

Disables the external pulse modulationfunction, if previously

programmed. DPT Sets the internal pulse mode to single,the internal pulse trigger

to triggered with delay, and turns on the internal pulse

modulation function.

Disables the external pulse modulationfunction, if previously

programmed. SD0 Turns off the internal pulse stepped delay mode. SD1 Turns onthe internal pulse stepped delay mode, if internal

pulse modulation is on andthe pulse trigger is “delayed” or

“triigger with delay.”

SQP Turns on internal 1 kHz square wave pulse modulation. Sets

the internal pulse width1 to500ms, PRF to 1 kHz,pulse mode

to single, pulse trigger tofree run, and turns on the internal

pulse modulation function.

Disables the external pulse modulationfunction, if previously

programmed.

683XXC PM 2-37

PROGRAMMING WITH MODULATION GPIB COMMANDS COMMANDS

Table 2-9. Modulation Commands (6 of 6)

MNEMONIC

CODE

SW0 Same as P0. Turns off the internal or external pulse modulation

function.

SW1 Turns on internal 400 Hz square wave pulse modulation. Sets

the internal pulse width1 to1.25ms, PRF to 400 Hz,pulse mode to single, trigger tofree run, pulse clock rate to 40 MHz, and turns on the internalpulse modulation function. Disables the external pulse modulationfunction, if previously programmed.

SW2 Same as SQP. Turns on internal 1 kHz square wave pulse

modulation. Sets the internal pulsewidth1 to 500ms, PRF to 1 kHz, pulse mode tosingle, pulse trigger to free run, and turns on the internal pulse modulationfunction. Disables the external pulse modulationfunction, if previously programmed.

SW3 Turns on internal 7.8125 kHz square wave pulse modulation.

Sets the internal pulse width1to 64ms, PRF to 7.8125 kHz, pulse mode to single, pulsetrigger to free run, and turns on the internal pulse modulation function. Disables the external pulse modulationfunction, if previously programmed.

FUNCTION

SW4 Turns on internal 27.8 kHz square wave pulse modulation. Sets

the internal pulse width1 to18ms, PRF to 27.8 kHz,pulse mode to single, pulse triggerto free run, pulse clock rate to 40 MHz, and turns onthe internal pulse modulation function. Disables the external pulse modulationfunction, if previously programmed.

SW5 Same as P3. Selects front panel external pulse input to pulse

modulate the RF output signalor to trigger or gate the internal pulse generator.

SW6 Same as P4. Selects rear panel external pulse input to pulse

modulate the RF output signalor to trigger or gate the internal pulse generator.

SC0 Turns SCANmodulation function off.If the SCAN Modulator

(Option 20) was not installed,this command produces a syntax error.

SC1 Turns SCANmodulation function on. If the SCAN Modulator

(Option 20) was not installed,this command produces a syntax error.

2-38 683XXC PM

PROGRAMMING WITH MEASURE GPIB COMMANDS FUNCTION COMMANDS

2-10

MEASURE FUNCTION COMMANDS

Table 2-10 lists the measure function commands. These commands provide for measuring the following:

The actual modulation depth of the RF output signal, as caused

by an external AM signal connected to either the front panel or rear panel AM IN connector. The actual frequency deviation of the RF output signal, as caused

by an external FM signal connected to either the front panel or rear panel FM IN connector. The actual RF power of an external source, via a 560-7, 5400-71,

or 6400-71 Series Detector connected to the rear panel POWER METER connector. (To make RF power measurements, Option 8 must be installed.)

Table 2-10. Measure Function Commands

MNEMONIC

CODE

AMI Turns on the AM Measurement mode. In this mode, the signal

generator measures the voltage ofthe external modulating signal and calculates the modulationdepth of the RF output signal. The measurement results will besent to the controller upon receipt of the OMM command(Table 2-11). When the AMI command isreceived, measurements will continue to be taken untilthe mode is exited by receipt of the MOM command.

FUNCTION

FMD Turns on the FM Measurement mode. Inthis mode, the signal

generator measures the voltage ofthe external modulating signal and calculates the peakfrequency deviation of the RF output signal. The measurement results will besent to the controller upon receipt of the OMM command(Table 2-11). When the FMD command isreceived, measurements will continue to be taken untilthe mode is exited by receipt of the MOM command.

MOM Turns off the AM and FM measurement modes.

PM1 Turns on the Power Measurement mode (Option 8), whereby

RF power can be measuredat an external source by a 560-7, 5400-71, or 4600-71 Series Detectorconnected to the rear panel POWER METER connector. The measurement results will besent to the controller upon receipt of the OPM command(Table 2-11). Power measurements can be takensimultaneously with modulation measurements.

PM0 Turns off thePower Meter Measurement mode.

683XXC PM 2-39

PROGRAMMING WITH OUTPUT GPIB COMMANDS COMMANDS

2-11

OUTPUT COMMANDS

Table 2-11 lists the output command mnemonic codes. These commands provide for the output of data from the signal generator to the controller. Figure 2-8 (page 2-45) shows examples of output command programming.

Table 2-11. Output Commands(1 of 6)

MNEMONIC

CODE

IDN? Causes the signal generator toreturn an identification string in

IEEE-488.2 specified <NR1> format (fourfields separated by commas). The fields are:<Manufacturer>, <Model>,<Serial #>, <Firmware revision level>; where theactual model number, serial number, and firmware version of the 683XXC will be passed.

OI Causes the signal generator to identify itself by sending the

following parameter information over thebus; model number, low-end frequency, high-end frequency, minimumoutput power level, maximum output power level,software revision number, serial number, model prefix (A or B), and series (2 or 3).This command can be used tosend parameter information to the controller automatically, thus relieving the operator from having to input the information manually. The string is 36 characters long.

FUNCTION

OFL Returns the low-end frequency value (in MHz) to thecontroller.

OFH Returns the high-end frequency value (in MHz) to the control-

ler. OF0 Returns the F0 frequency value (in MHz) to thecontroller. OF1 Returns the F1 frequency value (in MHz) to thecontroller. OF2 Returns the F2 frequency value (in MHz) to thecontroller. OF3 Returns the F3 frequency value (in MHz) to thecontroller. OF4 Returns the F4 frequency value (in MHz) to thecontroller. OF5 Returns the F5 frequency value (in MHz) to thecontroller. OF6 Returns the F6 frequency value (in MHz) to thecontroller. OF7 Returns the F7 frequency value (in MHz) to thecontroller. OF8 Returns the F8 frequency value (in MHz) to thecontroller. OF9 Returns the F9 frequency value (in MHz) to thecontroller.

OM0 Returns the M0 frequency value (in MHz) to the controller.

2-40 683XXC PM

PROGRAMMING WITH OUTPUT GPIB COMMANDS COMMANDS

Table 2-11. Output Commands(2 of 6)

MNEMONIC

CODE

OM1 Returns the M1 frequency value (in MHz) to the controller. OM2 Returns the M2 frequency value (in MHz) to the controller. OM3 Returns the M3 frequency value (in MHz) to the controller. OM4 Returns the M4 frequency value (in MHz) to the controller. OM5 Returns the M5 frequency value (in MHz) to the controller. OM6 Returns the M6 frequency value (in MHz) to the controller. OM7 Returns the M7 frequency value (in MHz) to the controller. OM8 Returns the M8 frequency value (in MHz) to the controller. OM9 Returns the M9 frequency value (in MHz) to the controller.

OL0 Returns the L0 power value(in dBm when in log mode; in mV

when in linear mode) tothe controller.

OL1 Returns the L1 power value(in dBm when in log mode; in mV

when in linear mode) tothe controller.

FUNCTION

OL2 Returns the L2 power value(in dBm when in log mode; in mV

when in linear mode) tothe controller.

OL3 Returns the L3 power value(in dBm when in log mode; in mV

when in linear mode) tothe controller.

OL4 Returns the L4 power value(in dBm when in log mode; in mV

when in linear mode) tothe controller.

OL5 Returns the L5 power value(in dBm when in log mode; in mV

when in linear mode) tothe controller.

OL6 Returns the L6 power value(in dBm when in log mode; in mV

when in linear mode) tothe controller.

OL7 Returns the L7 power value(in dBm when in log mode; in mV

when in linear mode) tothe controller.

OL8 Returns the L8 power value(in dBm when in log mode; in mV

when in linear mode) tothe controller.

OL9 Returns the L9 power value(in dBm when in log mode; in mV

when in linear mode) tothe controller.

OLO Returns the Level Offset power value (in dB when in log mode;

in mV when in linearmode) to the controller.

683XXC PM 2-41

PROGRAMMING WITH OUTPUT GPIB COMMANDS COMMANDS

Table 2-11. Output Commands(3 of 6)

MNEMONIC

CODE

ODF Returns theDF frequency value (in MHz)to the controller. OPD Returns the dwell time of the power sweep (in ms) to the

controller.

OPS Returns the number-of-steps of the power sweep tothe

controller.

OSD Returns the dwell time of the step sweep (in ms) to the

controller.

OSS Returns the number-of-steps of the step sweep tothe

controller.

OST Returns the sweep time value (in ms) to the controller. OAD1 Returns the internal AM depth value (in%) to the controller. OAD2 Returns the internal AM depth value (indB) to the controller.

OAR Returns the internal AM rate (in Hz) to the controller.

OAW Returns the name ofthe internal AM waveform (“SINE”,

“SQUARE WAVE”, “RAMP UP”, “RAMPDOWN”, “GAUSSIAN NOISE”, “UNIFORM NOISE”, “TRIANGLE”) tothe controller.

FUNCTION

OAS Returns the external AM sensitivity value (in %/V)to the

controller.

OAB Returns the external AM sensitivity value (in dB)to the

controller.

OAI Returns the external AM impedance value (inW)tothe

controller.

OAE Returns the name of the AM source (“FRONT”,“REAR”,

“INTERNAL”) to the controller.

OFD Returns the internal FM deviation value (in Hz) to the

controller.

OFR Returns the internal FM rate (in Hz) to the controller.

OFW Returns the nameof the internal FM waveform (“SINE”,

“SQUARE WAVE”, “RAMP UP”, “RAMPDOWN”, “GAUSSIAN NOISE”, “UNIFORM NOISE”, “TRIANGLE”) tothe controller.

OFK Returns the internal or external FM lock status (“UNLOCKED

NARROW”, “UNLOCKED WIDE”, “LOCKED”) tothe controller.

2-42 683XXC PM

PROGRAMMING WITH OUTPUT GPIB COMMANDS COMMANDS

Table 2-11. Output Commands(4 of 6)

MNEMONIC

CODE

OFS Returns the external FM sensitivity value (in MHz/V) to the

controller.

OFI Returns the external FM impedance value (inW)tothe

controller.

OFE Returns the name of the FM source (“FRONT”, “REAR”,

“INTERNAL”) to the controller.

OPHD Returns the internalFM deviation value (in radians)to the

controller

OPHR Returns the internalFM rate (in Hz) tothe controller.

OPHW Returns the name of the internalFM waveform (“SINE”.

“SQUARE WAVE”, “RAMP UP”, “RAMPDOWN”, “GAUSSIAN NOISE”, “UNIFORM NOISE”, “TRIANGLE”) tothe controller.

OPHM Returns theinternal or externalFM mode (“NARROW”,

“WIDE”) to the controller.

OPHS Returns the externalFM sensitivity value (in radians/V)to the

controller.

FUNCTION

OPHI Returns the externalFM impedance value (inW)tothe

controller.

OPHE Returns the name of theFM source (“FRONT”, “REAR”,

“INTERNAL”) to the controller.

OPR Returns the internal pulse frequency (in MHz) to the controller.

OPP Returns the internal pulse period (inms) to the controller.

OPW, OW1 Returns the internal pulse width1 value (inms) to the controller.

OW2 Returns the internal pulse width2 value (inms) to the controller. OW3 Returns the internal pulse width3 value (inms) to the controller. OW4 Returns the internal pulse width4 value (inms) to the controller.

ODP, OD1 Returns the internal pulse delay1value (inms) to the controller.

OD2 Returns the internal pulse delay2 value (inms) to the controller. OD3 Returns the internal pulse delay3 value (inms) to the controller. OD4 Returns the internal pulse delay4 value (inms) to the controller.

683XXC PM 2-43

PROGRAMMING WITH OUTPUT GPIB COMMANDS COMMANDS

Table 2-11. Output Commands(5 of 6)

MNEMONIC

CODE

ODD Returns theinternal pulse stepped delay mode step size value

(inms) to the controller.

ODE Returns the internal pulse stepped delay mode delay 1 stop

value (inms) to the controller.

ODL Returns the internal pulse stepped delay mode dwell-time-per-

step value (in ms) tothe controller.

ODS Returns the internal pulse stepped delay mode delay 1 start

value (inms) to the controller.

OMD Returns the nameof the internal pulse mode (“SINGLE”, “DOU-

BLET”, “TRIPLET”,"QUADRUPLET") to the controller. OPC Returns the internal pulse clock rate (in MHz) to the controller. OPM Returns the internal power meter measurement value (in dBm)

to the controller. OPT Returns the name of the internal pulse trigger (“FREE RUN”,

“GATED”,“DELAYED”, “TRIGGERED”, “TRIG WITHDELAY”,

“COMPOSITE”) to the controller.

FUNCTION

OP5 Returns the internal or external pulse polarity(“HIGH”, “LOW”)

to the controller.

OP3 Returns the name of the pulse source(“FRONT”, “REAR”,

“INTERNAL FRONT TRIG”, “INTERNALREAR TRIG”) to the

controller.

OMM 1. Returns the AM depth measurement value (in %) to the

controller, when the AMI command either has been or is also

programmed.

2. Returns the FM deviationmeasurement value (in MHz) to the

controller, when the FMD command either has been or is also

programmed. OVN Returns the ROM version number to the controller. OWT Returns the GPIBtermination status to the controller.

(0=CR; 1=CRLF) OSE Returns the last GPIB syntax error to thecontroller. OEM Returns the Extended SRQ Mask bytes (3 binary bytes) to the

controller. OES Returns the GPIB Status bytes (3 binary bytes)to the controller.

2-44 683XXC PM

PROGRAMMING WITH STORED SETUP GPIB COMMANDS COMMANDS

Table 2-11. Output Commands(6 of 6)

2-12

STORED SETUP COMMANDS

MNEMONIC

CODE

OSB Returns the Primary GPIB Status byte to thecontroller. OSM Returns the Primary SRQ Mask byte to the controller. OSR Returns the self-test results (6 binary bytes) to the controller.

760 OUTPUT 705;"OF1" 770 ENTER 705;A 780 PRINT “F1 is set at ”;A;" MHz"

1050 OUTPUT 705;"OSS" 1060 ENTER 705;A 1070 PRINT “Step Sweep has ”;A;" Steps"

Figure 2-8. Output Command Programming Examples

Table 2-12 (page 2-46) lists the stored setup command mnemonic codes. These commands provide for saving instrument setups and recalling them for use.

FUNCTION

A current instrument setup can be saved to internal setup memory using the SSN(M to nine instrument setups can be stored in this manner. The command

RSN(M

memory locations 1 to 9. If more than nine instrument setups are needed, or if it is desirable to

store the setups in the controller instead of the signal generator memory, the 683XXC can be commanded to output and accept stored setups over the bus.

The SAF command outputs the current instrument setup to the controller in a 4100-byte (approximately) binary data string. The controller stores the instrument setup. The RCF command readies the signal generator to receive a new instrument setup recalled from the controller. Figure 2-9 shows an example of SAF and RCF command programming.

The SAM and RCM commands perform the same functions as described for the SAF and RCF commands, except that all of the stored instrument setups are included in the binary data string along with

) recalls a stored instrument setup from internal setup

1 to 9

) command, where M = memory locations 1 to 9. Up

1 to 9

683XXC PM 2-45

PROGRAMMING WITH STORED SETUP GPIB COMMANDS COMMANDS

the current instrument setup. For these commands, the binary data string is approximately 41000 bytes long.

Table 2-12. Stored Setup Commands

MNEMONIC

CODE

SAF Outputs the current instrument setup to the controller.

SAM Outputs both the current instrument setup and all stored instru-

ment setups to the controller.

SM Recalls the next stored instrument setup in sequence.

SSN(M

RSN(M

) Saves the current instrument setupto internal setup memory

1-9

RCF Readies the683XXC to receive a new instrument setup re-

RCM Readies the 683XXC to receive a new instrument setup and

1-9

location M, whereM=1to9.

called from the controller.

new stored setups recalled fromthe controller.

) Recalls the instrument setup stored in internal setupmemory

location M, whereM=1to9.

FUNCTION

Programming Note: The SAF and SAM commands output binary data. The data string is terminated with “EOI” on the last byte sent (no CR or LF is sent).

10 DIM A$ [3000] 20 OUTPUT 705; “SAF” 30 ENTER 705 USING “#%, #%K”; A$ (Requires EOI

to be the terminator of the read.)

40 OUTPUT 705; “RCF”; A$ (A$ must follow the SAF.)

Figure 2-9. SAF and RCF Commands Programming Example

2-46 683XXC PM

PROGRAMMING WITH SRQ AND STATUS GPIB COMMANDS BYTE COMMANDS

2-13

SRQ AND STATUS BYTE COMMANDS

Table 2-13 (page 2-49) lists the Service Request (SRQ) and Status Byte command mnemonic codes. These commands enable the signal generator to request service from the controller when certain, predefined conditions exist.

Status Bytes The 683XXC has three GPIB status bytes—the pri-

mary and two extended status bytes. Figure 2-10 shows the three status bytes and identifies the status reporting function of each status byte bit.

Each status reporting bit, with the exception of primary status byte bit 6 (SRQ), is set when the condition on which it reports is detected. These changes in status byte bit settings can be read by the controller as follows:

The contents of the primary status byte is re-

turned to the controller in response to a serial poll or the OSB command. The contents of the primary status byte and

the two extended status bytes are returned to the controller in response to the OES command. Figure 2-11 (page 2-51) shows an example of OES command programming.

SRQ Generation

The signal generator can generate GPIB service requests (SRQs) to report instrument status and syntax errors to the controller. The signal generator will generate an SRQ if:

1. The SRQ generation function has been enabled using the SQ1 command and,

2. One (or more) of the status reporting functions is true and,

3. The primary status byte bit associated with the true status reporting function has been enabled.

Bits in the primary status byte can be enabled by either of two methods. The first uses the FB1/FB0,

ES1/ES0, UL1/UL0, LE1/LE0, PE1/PE0, SE1/SE0,

and SB1/SB0 commands, described in Table 2-13, to individually enable or disable each bit. The second method uses a single 8-bit status byte mask (MB0) to enable any or all of the primary status byte bits.

Figure 2-12 (page 2-51) shows examples of status byte mask programming.

683XXC PM 2-47

PROGRAMMING WITH SRQ AND STATUS GPIB COMMANDS BYTE COMMANDS

NOTE

Allstatusbyte bitsarelatched exceptforthose indicated withthe“*”. Once set, an OES or OSB commandmustbe received before the condition will be reset. The primary status byte bit 6 (SRQ) is cleared by a serial poll only.

Primary Status Byte

Extended

Status Byte 2

Bit 7

(128)

Primary status byte bit 0is set whenever one of the status conditions reported by an extended status byte 1is true and the associated status bit is enabled. This bit is cleared when thecontroller sends the OES command.

Primary status byte bit 7is set whenever one of the status conditions reported by an extended status byte 2is true and the associated status bit is enabled. This bit is cleared when thecontroller sends the OES command.

Primary status byte bit 6(SRQ) is not maskable. This bit is set by the SQ1 command and cleared by aserial poll.

Extended Status Byte 1

RF*

Leveled

Bit 7

(128)

SRQ Syntax

Bit 6

(64)

Not

Used

Bit 6

(64)

Error

Bit 5

(32)

Not

Used

Bit 5

(32)

Parameter

Range

Error

Bit 4

(16)

Not

Used

Bit 4

(16)

Lock ErrorRFUnleveled

Bit 3

(8)

RF*

Locked

Bit 3

(8)

Self Test

Completed

Bit 2

(4)

Bit 2

(4)

End

Sweep

Bit 1

(2)

Modulation

Error

Bit 1

(2)

Extended

Status Byte 1

Bit 0

(1)

Self Test

Failed

Bit 0

(1)

Extended status byte 1 bitsare enabled by the extended status byte 1 mask command, MB1.

Extended status byte 1 bit0 (SelfTest Failed) and bit 2 (Self Test Complete) should not be unmasked atthe same time.

Extended status byte 1 bit3 (RF Locked) is only used with the Model 360B interface. The setting of thisbit is blocked or unblocked by the commands, LS0 and LS1 (See Table 2-13).

The setting of extended statusbyte 1 bit 7 (RF Leveled) is blocked and unblocked by the commands LA0and LA1 (See Table 2-13).

Extended Status Byte 2

Parameter*

Changed

Bit 7

(128)

Calibrate Function

Finished

Bit 6

(64)

Not

Used

Bit 5

(32)

RF*

Unlocked

Bit 4

(16)

Crystal

Oven

Failure

Bit 3

(8)

Calibrate Function

Failed

Bit 2

(4)

Not

Used

Bit 1

(2)

Extended status byte 2 bitsare enabled by the extended status byte 2 mask command, MB2.

The setting of extended statusbyte 2 bit 4 (RF Unlocked) is blocked or unblocked by the commands, EL0and EL1 (See Table 2-13).

Extended status byte 2 bit7 (Parameter Changed) is only used with the Model 56100A interface. The setting of this bit is blocked or unblockedby the commands, II0 and II1 (SeeTable 2-13).

Figure 2-10. Primary and Extended Status Bytes

Not

Used

Bit 0

(1)

2-48 683XXC PM

PROGRAMMING WITH SRQ AND STATUS GPIB COMMANDS BYTE COMMANDS

Table 2-13. SRQ and Status Byte Commands (1 of 2)

MNEMONIC

CODE

ES1 Enables an SRQ to be generated when Primary Status Byte bit

1 (End of Sweep) isset and SQ1 has been programmed.

ES0 Inhibits an SRQ from being generated when the End of Sweep

bit is set. This isthe default mode.

FB1 Enables an SRQ to be generated when Primary Status Byte bit

0 (Extended Status Byte 1)is set and SQ1 has been programmed. The Extended Status Byte1 bit is set whenever one (or more) of theunmasked status reporting functions in Extended Status Byte 1 istrue.

FB0 Inhibits an SRQ from being generated when the Extended

Status Byte 1 bit isset. This is the default mode.

LE1 Enables an SRQ to be generated when Primary Status Byte bit

3 (Lock Error) is setand SQ1 has been programmed.

LE0 Inhibits an SRQ from being generated when the Lock Error bit

is set. This is thedefault mode.

MB0 Sets an 8-bit data mask that is used to enable specific bits of

the Primary Status Byte (Figure2-12). This enables any or all of the bits (except forbit 6) in the Primary Status Byte to generate an SRQ using one8-bit byte. This command can be equivalent to sending ES1, FB1,LE1, PE1, SE1, SB1, and UL1.

FUNCTION

MB1 Sets the enable mask byte for Extended Status Byte 1. MB2 Sets the enable mask byte for Extended Status Byte 2.

PE1 Enables an SRQ to be generated when Primary Status Byte bit

4 (Parameter Range Error) isset and SQ1 has been programmed.

PE0 Inhibits an SRQ from being generated when the Parameter

Range Error bit is set.This is the default mode.

SB1 Enables an SRQ to be generated when Primary Status Byte bit

7 (Extended Status Byte 2)is set and SQ1 has been programmed. The Extended Status Byte2 bit is set whenever one (or more) of theunmasked status reporting functions in Extended Status Byte 2 istrue.

SB0 Inhibits an SRQ from being generated when the Extended

Status Byte 2 bit isset. This is the default mode.

SE1 Enables an SRQ to be generated when Primary Status Byte bit

5 (Syntax Error) is setand SQ1 has been programmed.

683XXC PM 2-49

PROGRAMMING WITH SRQ AND STATUS GPIB COMMANDS BYTE COMMANDS

Table 2-13. SRQ and Status Byte Commands (2 of 2)

MNEMONIC

CODE

SE0 Inhibits an SRQ from being generated when the Syntax Error

bit is set. This isthe default mode.

SQ1 Enables the SRQ generation function. This command allows a

status reporting function, that istrue and enabled, to pull the SRQ line LOW (true) andrequest service from the controller.

SQ0 Disables the SRQ generation function. This is the default

mode.

UL1 Enables an SRQ to be generated when Primary Status Byte bit

2 (RF Unleveled) is setand SQ1 has been programmed.

UL0 Inhibits an SRQ from being generated when the RF Unleveled

bit is set. This isthe default mode.

LS1 Unblocks updating of the Extended Status Byte 1 bit 3 (RF

Locked). This bit is onlyused with the Model 360B interface.

LS0 Disables updating of the Extended Status Byte 1 bit 3. This is

the default setting.

LA1 Unblocks updating of the Extended Status Byte 1 bit 7 (RF

Leveled).

FUNCTION

LA0 Blocks updating of the Extended Status Byte 1 bit 7. This is the

default setting.

EL1 Unblocks updating of the Extended Status Byte 2 bit 4 (RF Un-

locked).

EL0 Blocks updating of the Extended Status Byte 2 bit 4. This is the

default setting because it isnormal for the RF to be momentarily unlocked during sweeps andsweep retrace.

II1 Unblocks updating of the Extended Status Byte 2bit 7

(Parameter Changed). This bit isonly used with the Model 56100A interface. This bit is cleared when the 56100Asends the OCP command (Output Last Parameter Changed).

II0 Disables updating of the Extended Status Byte 2bit 7. This is

the default setting.

CSB Clears all GPIB status bytes.

2-50 683XXC PM

PROGRAMMING WITH SRQ AND STATUS GPIB COMMANDS BYTE COMMANDS

OUTPUT 705; “OES” ENTER 705 USING “#, B”; A, B, C MAIN = A 1EXT=B 2EXT=C

Figure 2-11. OES Command Programming Example

The 683XXC has a softwaremask that permits manipulation of the three status bytes over the bus. This manipulation is accomplished by sending the commandcodes MB0, MB1, MB2, or all three at once, followed by an argument that assigns an on/off condition for each bit in the byte. Two examples are shownbelow:

EXTENDED STATUS BYTE 2

"1"

"2"

"4"

"8"

"16"

"32"

"64"

"128"

PRIMAR Y

STATUS

BYTE BIT 7

CALIBRATE FUNCTION FAILED

CRYSTAL OVEN FAILURE

RF UNLOCKED

CALIBRATE FUNCTION FINISHED

PARAMETER CHANGED

EXAMPLE #1

EXAMPLE #2

MASK BYTE 2

EXAMPLE #1:

MB2" (CHR $(24))

Sets bits 3 and 4in Mask Byte 2 to 1 and all other bits to 0, thus enabling bits 3 and 4in Extended Status Byte 2 to be read from the bit 7position of the Primary Status Byte.

EXAMPLE #2:

MB2" (CHR $(12))

Sets bits 2 and 3in Mask Byte 2 to 1 and all other bits to 0, thus enabling bits 2 and 3in Extended Status Byte 2 to be read from the bit 7position of the Primary Status Byte.

Figure 2-12. Status Byte Mask Programming Examples

683XXC PM 2-51

PROGRAMMING WITH CONFIGURATION GPIB COMMANDS COMMANDS

2-14

CONFIGURATION COMMANDS

Table 2-14 lists the configuration command mnemonic codes. These commands permit selection/setting of the following system configuration items via the bus:

A +5V or –5V level for the rear panel retrace and bandswitch

blanking outputs. A TTL-low or TTL-high signal to turn RF on during pulse

moduation. Setting the frequency scaling reference multiplier value.

Normally-open or normally-closed contacts on the internal penlift

relay. RF on or RF off during frequency switching in CW, step sweep,

and list sweep modes. RF on or RF off during sweep retrace.

RF on or RF off at reset.

40 dB or 0 dB of attenuation when RF is switched off in units

with a step attenuator (Option 2).

The system configuration selections made with GPIB commands remain in effect when the instrument is returned to local control.

Table 2-14. Configuration Commands (1 of 2)

MNEMONIC

CODE

FUNCTION

BPN Selects a–5V level for the retrace and bandswitch blanking

outputs. (The retrace blanking outputsignal is available at pin 6 of the AUX I/Oconnector; the bandswitch blanking output signal at pin 20 ofthe AUX I/O connector.)

BPP Selects a +5V levelfor the retrace and bandswitch blanking

outputs. EP0 Selects TTL-lowto turn RF on during pulse modulation. EP1 Selects TTL-highto turn RF on during pulse modulation.

FRS Permits setting the frequencyscaling reference multiplier

value. The multiplier value mustbe between 0.1 to 14 and

must be terminated with TMS.

Programming Example:

Programming “FRS 3 TMS” sets the frequency scaling

reference multiplier to 3.

This command affects all entered and displayed frequencies,

but does not affect the output of the instrument.

PPO Selects normally-open contacts on theinternal penlift relay.

(The penlift relay output, optionallyavailable at the rear panel,

is used to lift aplotter pen during retrace.)

PPC Selects normally-closedcontacts on the internal penlift relay.

2-52 683XXC PM

Changed: May 1999

PROGRAMMING WITH CONFIGURATION GPIB COMMANDS COMMANDS

Table 2-14. Configuration Commands (2 of 2)

MNEMONIC

CODE

RC0 Selects RF to beoff during frequencyswitching in CW, step

sweep, and list sweep modes.

RC1 Selects RF to beon during frequency switching in CW, step

sweep, and list sweep modes. RT0 Selects RF to be off during retrace. RT1 Selects RF to be on during retrace. RO0 Selects RFto be on at reset. (This is the default mode.) RO1 Selects RFto be off at reset. TR0 Sets 0dB of attenuation when RF is switched of fin units with

a step attenuator (Option 2)installed. If Option 2 is not in-

stalled, this command produces asyntax error. TR1 Sets 40dB (minimum) of attenuation wnen RF is switched off

in units with a stepattenuator (Option 2) installed. This pro-

vides a better output sourcematch. If Option 2 is not installed,

this command produces a syntaxerror.

FUNCTION

683XXC PM 2-51A/2-52A Changed: May 1999

PROGRAMMING WITH GROUP EXECUTE GPIB COMMANDS TRIGGER COMMANDS

2-15

GROUP EXECUTE TRIGGER COMMANDS

Table 2-15 lists the group execute trigger (GET) command mnemonic codes. These commands let a GET bus message (Table 1-3) be used to trigger certain signal generator functions and thus speed up bus operations.

In the default state, the 683XXC responds to a GET message by triggering a single sweep.

Table 2-15. Group Execute Trigger Commands

MNEMONIC

CODE

GTC Configures the 683XXC to executea SQF command (scan to

the next higher preset CWfrequency) each time a GET message is received.

GTD Configures the 683XXC to executea DN command (steps the

open parameter down by thestep size) each time a GET message is received.

GTF Configures the 683XXC to execute a fast-frequency-switching

step (Table 2-17) each time a GETmessage is received.

GTL Configures the 683XXC to execute a TSS command (steps to

the next point in adual step sweep mode) each time a GET message is received.

FUNCTION

GTO Disables the GET functions.

GTS Configures the 683XXC to execute a TRS command (trigger

a single sweep) each timea GET message is re-ceived. This is the default mode.

GTT Configures the 683XXC to execute a TSTcommand (execute

a complete signal generator selftest) each time a GET message is received.

GTU Configures the 683XXC to executea UP command(steps the

open parameter up by thestep size) each time a GET message is received.

Y Sending a “Y” is equivalent to sending a GET.

683XXC PM 2-53 Changed: May 1999

PROGRAMMING WITH LIST SWEEP GPIB COMMANDS COMMANDS

2-16

LIST SWEEP COMMANDS

Table 2-16 lists the list sweep command mnemonic codes. These commands provide for (1) placing the signal generator in list sweep mode, (2) accessing up to four lists of 2000 frequency/power level sets, and (3) generating a phase-locked step sweep of the list frequency/power level sets.

In list sweep mode, up to four lists of 2000 non-sequential frequency/ power level sets can be stored and accessed. Alist index (0 thru 1999) identifies each frequency/power level set in a list. When commanded, the signal generator generates a phase-locked step sweep between the specified list start index and list stop index.

Accessing and Editing a List

The command, LST, places the signal generator in list sweep mode. The ELN(x) command is used to select which of the four lists is to be accessed. The first list (list number 0) is the same list that is available via local (front panel) control. This list is stored in non-volatile RAM to perserve any settings after the instrument is powered off. The other three lists (list numbers 1, 2, and 3) are all stored in volatile RAM and all settings are lost when power to the signal generator is turned off. At power up, list numbers 1, 2, and 3 are set to their default state of 2000 index entries of 5 GHz at 0 dBm.

The ELI(xxxx) command sets the list index for the current list. Use the LF command to set the list frequencies starting at the list index and the LP command to set the list power levels starting at the list index. Any number of frequencies and power levels can follow these commands.

Another method of entering frequency and power level information into the current list index is to use the command, CTL, which copies the current CW frequency and power level to the current list index.

Programming Example:

Programming “LST ELN1 ELI1234 LF 2 GH,

5 GH, 1 GH, 8 GH LP 2 DM, 9 DM, –3 DM,

–10 DM” places the signal generator in list sweep

mode, selects list number 1, and sets the list index to 1234. List index 1234 is set to 2 GHz at 2 dBm, list index 1235 is set to 5 GHz at 9 dBm, list index 1236 is set to 1 GHz at –3 dBm, and list index 1237 is set 8 GHz at –10 dBm.

2-54 683XXC PM

Changed: May 1999

PROGRAMMING WITH LIST SWEEP GPIB COMMANDS COMMANDS

Table 2-16. List Sweep Commands

MNEMONIC

CODE

LST Places the 683XXC in List Sweep mode.

ELI(xxxx) Sets list index to xxxx, where xxxx = 4-digit integer between

0000 and 1999.

ELN(x) Sets list number to x, where x = 1-digit integer between 0 and

LF Sets list frequencies starting at the list index. Any number of

frequencies can follow. This command does value of the list index.

LP Sets list power levels starting at the list index. Any number of

power levels can follow. This command does value of the list index.

LIB(xxxx) Sets the list start index to xxxx, where xxxx = 4-digit integer

between 0000 and 1999.

LIE(xxxx) Sets the list stop index to xxxx, where xxxx = 4-digit integer

between 0000 and 1999.

AUT Selects AutoTrigger

FUNCTION

not

change the

not

change the

HWT Selects External Trigger

EXT Selects Single Trigger

only

TRG Triggers a Single Sweep (

MNT Selects Manual Trigger

UP Increases list index by one ( DN Decreases list index by one (

LEA Learn List (This command initiates a process that examines

every index in the listand performs all calculations necessary to set the frequency andpower levels.)

CTL Copy current CW frequency and power level to the currentlist

index.

in Single Triggermode)

only

in Manual Triggermode)

only

in Manual Triggermode)

683XXC PM 2-55 Changed: May 1999

PROGRAMMING WITH LIST SWEEP GPIB COMMANDS COMMANDS

List Sweep Triggering

Four different modes of triggering are available in list sweep mode—automatic, external, single, and manual. When automatic, external, or single trigger mode is selected, the output sweeps between the specified list start and stop indexes, dwelling at each list index for the specified dwell time. When manual trigger mode is selected, the list start index, list stop index, and dwell time parameter are not used. Instead, the list index is incremented using the UPcommand or an external TTL trigger and is decremented using the DN command.

The AUTcommand selects automatic sweep triggering and the HWT command selects external sweep triggering. When external sweep trigger mode is selected, the output sweep recurs when triggered by an external TTL-compatible clock pulse to the rear panel AUX I/O connector. The EXT command selects single list sweep triggering. When single sweep trigger mode is selected, a single list sweep starts when the TRG command is received.

The MNTcommand selects the manual trigger mode. In manual trigger mode, the list index is incremented by one each time the UP command is received or each time an external TTL trigger is received. This list index is decremented by one each time the DN command is received.

Generating a List Sweep

Generating a list sweep involves selecting a sweep range, a dwell-time-per-step, and a sweep trigger. The list sweep range is defined by a list start index and a list stop index. Use the LIB(xxxx) command to set the list start index and the LIE(xxxx) command to set the list stop index. The dwell-time-per-step of the list sweep is changed using the LDT parameter entry command. Select a trigger for the list sweep using the list sweep trigger commands previously described.

Programming Example:

Programming “LIB1234 LIE1237 EXT LDT 10 MS TRG” implements a list sweep from current list

index 1234 to index 1237 in single trigger mode with a 10 ms dwell-time-per-step, then triggers a single sweep.

2-56 683XXC PM

Changed: May 1999

PROGRAMMING WITH LIST SWEEP GPIB COMMANDS COMMANDS

List Calculations

During the initial list sweep, the signal generator performs calculations to set the frequency and power levels. This causes the initial list sweep to take longer than each subsequent sweep. The command, LEA, initiates a process that examines every index in the current list and performs all the calculations necessary to set the frequency and power levels. This lets the initial list sweep be as fast as each subsequent sweep.

The list calculations are for the current list only. Any changes to the current list or selection of another list requires the calculations to be performed again. The calculations are stored only in volatile RAM and are lost when power to the signal generator is turned off.

683XXC PM 2-57 Changed: May 1999

PROGRAMMING WITH FAST-FREQUENCYGPIB COMMANDS SWITCHING COMMANDS

2-17

FAST-FREQUENCYSWITCHING COMMANDS

Table 2-17 lists the fast-frequency-switching command mnemonic codes. These commands provide for reducing the time that it takes to switch between CW frequencies.

In the fast-frequency-switching mode, up to 3202 frequencies can be loaded into a table. A table pointer can then be set to point to a specific frequency in the table and the signal generator commanded to switch from that frequency through the following frequencies to the bottom of the table.

Loading the Frequency Table

To load the frequency table, use the command

ZTLbbbbnnnnD8D8D8.....D8, where “bbbb” is the ta-

ble location where the frequency points are to start loading, “nnnn” is the number of frequency points to be loaded, and “D8” is the frequency of the frequency point. Both “bbbb” and “nnnn” are 4 binary byte integers and “D8” is 8 binary bytes of an IEEE-754 double precision floating point number. The order of the bytes in each field is most significant byte first.

NOTE

Use of the commands ZL(X

and ZS(

) limits the number of fre-

000-999

), ZEL,

quency points in the table to 1000.

Figures 2-13 thru 2-13b show an example of fast-frequency-switching mode programming.

Table 2-17. Fast-Frequency-Switching Commands

MNEMONIC

CODE

ZPN Sets the table pointer(ZPNbbbb), where bbbb is the location

the pointer is to pointto.

ZTL Loads the frequency table (ZTLbbbbnnnnD8D8D8.....D8),

where bbbb is the tablelocation where the frequency points are to start loading, nnnnis the number of frequencies to be loaded, and D8 is thefrequency of the frequency point.

ZL(X

ZEL Ends frequency loading.

ZS(X

) Loads a CW frequency into the stack at location X. The

000-999

location is a number from000 to 999.

) Sets the stack pointer to point to location X. The location is a

number from 000 to 999.

FUNCTION

2-58 683XXC PM

PROGRAMMING WITH FAST-FREQUENCYGPIB COMMANDS SWITCHING COMMANDS

The following is an exampleof fast-frequency-switching mode programming. This is a IBM-PC based program using the National Instruments NI-488.2 C languageinterface library (mcib.lib) and header (decl.h).

#include <stdio.h> #include decl.h

#define BOARD_ID 0

void main() { Addr4882_t source_addr = 5,

device_addr[2] = {5, NOADDR};

double freq_list[2] = {600e6, 8e9},

*double_ptr;

int start_index,

num_freqs = 2, *integer_ptr;

char command_str[50];

/** Clear the bus and take control. **/ SendIFC(BOARD_ID); if (ibsta & ERR)

{ exit (-1); }

/** Set the remote enable line. **/ EnableRemote(BOARD_ID, device_addr); if (ibsta & ERR)

{ exit (-1); }

/** Set the start index to an arbitrary starting point. **/ start_index = 12;

/** Begin constructing the command. **/ command_str[0] = Z; /** Start with the ZTL command. **/ command_str[1] = T; command_str[2] = L;

integer_ptr = &start_index; /** Point to the start index. **/ command_str[3] = (char)(*(integer_ptr + 3)); /** Get the value of the fourth byte. **/

/** Data is LSB first on Intel based PCs. **/ command_str[4] = (char)(*(integer_ptr + 2)); /** Get the value of the third byte. **/ command_str[5] = (char)(*(integer_ptr + 1)); /** Get the value of the second byte. **/ command_str[6] = (char)(*integer_ptr); /** Get the value of the first byte. **/

NOTE: This program is continuedin Figure 2-13a.

Figure 2-13. Fast-Frequency-Switching Programming Example (1 of 3)

683XXC PM 2-59

PROGRAMMING WITH FAST-FREQUENCYGPIB COMMANDS SWITCHING COMMANDS

integer_ptr = &num_freqs; /** Point to the number of frequencies. **/ command_str[7] = (char)(*(integer_ptr + 3)); /** Get the value of the fourth byte. **/ command_str[8] = (char)(*(integer_ptr + 2)); /** Get the value of the third byte. **/ command_str[9] = (char)(*(integer_ptr + 1)); /** Get the value of the second byte. **/ command_str[10] = (char)(*integer_ptr); /** Get the value of the first byte. **/

double_ptr = &(freq_list[0]) /** Point to the first frequency. **/ command_str[11] = (char)(*(double_ptr + 7)); /** Get the value of byte 7. **/

/** Data is LSB first on Intel based PCs. **/ command_str[12] = (char)(*(double_ptr + 6)); /** Byte 6. **/ command_str[13] = (char)(*(double_ptr + 5)); /** Byte 5. **/ command_str[14] = (char)(*(double_ptr + 4)); /** Byte 4. **/ command_str[15] = (char)(*(double_ptr + 3)); /** Byte 3. **/ command_str[16] = (char)(*(double_ptr + 2)); /** Byte 2. **/ command_str[17] = (char)(*(double_ptr + 1)); /** Byte 1. **/ command_str[18] = (char)(*double_ptr ); /** Byte 0. **/

double_ptr = &(freq_list[1]) /** Point to the second frequency. **/ command_str[19] = (char)(*(double_ptr + 7)); /** Get the value of byte 7. **/ command_str[20] = (char)(*(double_ptr + 6)); /** Byte 6. **/ command_str[21] = (char)(*(double_ptr + 5)); /** Byte 5. **/ command_str[22] = (char)(*(double_ptr + 4)); /** Byte 4. **/ command_str[23] = (char)(*(double_ptr + 3)); /** Byte 3. **/ command_str[24] = (char)(*(double_ptr + 2)); /** Byte 2. **/ command_str[25] = (char)(*(double_ptr + 1)); /** Byte 1. **/ command_str[26] = (char)(*double_ptr ); /** Byte 0. **/

/** Send the command. **/ Send(BOARD_ID, source_addr, command_str, 27, DABend); if (ibsta & ERR)

{ exit (-1); }

/** Set the pointer back to the start index. **/ command_str[0] = Z; /** ZPN command. **/ command_str[1] = P; command_str[2] = N;

integer_ptr = &start_index; /** Point to the start index. **/ command_str[3] = (char)(*(integer_ptr + 3)); /** Get the value of the fourth byte. **/ command_str[4] = (char)(*(integer_ptr + 2)); /** Get the value of the third byte. **/ command_str[5] = (char)(*(integer_ptr + 1)); /** Get the value of the second byte. **/ command_str[6] = (char)(*integer_ptr); /** Get the value of the first byte. **/

/** Send the command. **/ Send(BOARD_ID, source_addr, command_str, 7, DABend); if (ibsta & ERR)

{ exit (-1); }

NOTE: This program is continuedin Figure 2-13b.

Figure 2-13a. Fast-Frequency-Switching Programming Example (2 of 3)

2-60 683XXC PM

PROGRAMMING WITH FAST-FREQUENCYGPIB COMMANDS SWITCHING COMMANDS

/** Send a trigger. **/ Trigger(BOARD_ID, source_addr); if (ibsta & ERR)

{ exit (-1); }

/** Source is now outputting 600 MHz. **/

/** Send a trigger. **/ Trigger(BOARD_ID, source_addr); if (ibsta & ERR)

{ exit (-1); }

/** Source is now outputting 8 GHz. **/

exit(0);

} /** End of main **/

Figure 2-13b. Fast-Frequency-Switching Programming Example (3 of 3)

683XXC PM 2-61

PROGRAMMING WITH POWER-OFFSETGPIB COMMANDS TABLE COMMANDS

2-18

POWER-OFFSETTABLE COMMANDS

Table 2-18 lists the power-offset-table command mnemonic codes. These commands provide for maintaining a consistent power level at a point within a test setup across the measurement frequencies. This “flattening” of the test point power level is accomplished by summing a power offset word (from the power offset table) with the signal generator’s normal power level DAC word at each frequency point.

The power-offset mode works in conjunction with the fast-frequencyswitching mode (paragraph 2-17). The frequency stack must be loaded before loading the power-offset table because the frequency loading sets the upper limit for the number of entries in the power-offset table. The same pointer is used for both the frequency stack and the poweroffset table. Once the power-offset table is loaded, the PT1 command turns on the power-offset mode; the PT0 command turns it off.

Loading the Power-Offset Table

To load the power-offset table, use the command,

PTL clch dldh....., where “clch” is the number of

power-offset words and “dldh” is a power-offset word. Both “clch” and “dldh” are two-byte binary words sent LOW byte first and HIGH byte second. The power-offset word is in hundreths of a dB. Negative power offsets use twos-complement representation.

To change a power-offset word in the table, use the PTC dldh command, where “dldh” is the new poweroffset word for the current power level setting.

Programming Note:

Care must be taken to send the exact number of power-offset words specified in the wordcount, “clch”. If too few words are sent, the GPIB interface may not respond properly.

Figures 2-14 and 2-14a show an example of power-offset mode programming.

Table 2-18. Power-Offset-Table Commands

MNEMONIC

CODE

PT0 Disable the Power Offset Table PT1 Enable the Power Offset Table

PTC Change a Power Offset Table entry (PTC dldh), where dldh is

the new offset word for the current table entry.

PTL Load a Power Offset Table (PTLclch dldh ...), where clch is the

data word count and dldhis the data word.

FUNCTION

2-62 683XXC PM

PROGRAMMING WITH POWER-OFFSETGPIB COMMANDS TABLE COMMANDS

The following is an exampleof power-offset mode programming. This program is writtenfor use with an IBM-PC type computer/controller containing an IOtech GPIBinterface.

#include <stdio.h> #include <stdlib.h> #include <string.h>

/* IOtech Driver488/LIB Subroutine Interface definitions... */ #include \ieee488\iotlib.h #include \ieee488\iot_main.h

/* Define the device handles */ DevHandleT Synth,ieee;

void main() {

char CmdString[10], DataString[40], String[40]; unsigned char XString[160];

int next_step,i,j;

/*************************************************************************/ /* Initialize the IOtech interface board and */ /* obtain the interfaces handle. */

#define ADDRESS 5

if((ieee=InitIeee488(btMP488CT, 21, -1, 0x02el, 7, 5, 1, 10000,0))==-1)

{ printf(Cannot initialize IEEE 488 system.\n) exit(1); }

if(( Synth=CreateDevice( ADDRESS, -1 ) )==-1)

{ printf(Cannot create Synth device.\n); exit(1);

/* Set the device timeout so you dont wait forever if theres a problem */ TimeOut(Synth, 2000);

/* Handle the errors in the program */ Error(Synth,OFF);

/*************************************************************************/

/* Address the Synthesizer to listen */

NOTE: This program is continuedin Figure 2-14a.

Figure 2-14. Power-Offset Mode Programming Example (1 of 2)

683XXC PM 2-63

PROGRAMMING WITH POWER-OFFSETGPIB COMMANDS TABLE COMMANDS

strcpy(XString,"_?U%"); SendCmd(Synth,XString,strlen(XString));

Output(Synth,"RST"); Output(Synth,"GTF"); Output(Synth,"ZL000"); Output(Synth,"1 GH 2 GH 3 GH 4 GH 5 GH 6 GH 7 GH 8 GH 9 GH 10 GH"); Output(Synth,"ZEL");

/* Make a data array with the PTL command, the word count */ /* and the binary data in low-byte, high-byte order. */ DataString[0]=P; DataString[1]=T; DataString[2]=L; DataString[3]=10; /* Low byte  ten words */ DataString[4]=0; /* High byte  */ DataString[5]=0; /* 0 */ DataString[6]=0; DataString[7]=20; /* 276 */ DataString[8]=1; DataString[9]=30; /* 542 */ DataString[10]=2; DataString[11]=40; /* 808 */ DataString[12]=3; DataString[13]=50; /* 1074 */ DataString[14]=4; DataString[15]=60; /* 1340 */ DataString[16]=5; DataString[17]=70; /* 1606 */ DataString[18]=6; DataString[19]=80; /* 1872 */ DataString[20]=7; DataString[21]=90; /* 2138 */ DataString[22]=8; DataString[23]=100; /* 2404 */ DataString[24]=9;

/* Send the data with an EOI on the last byte */ SendEoi(Synth,DataString,25);

Output(Synth,"PT1"); Output(Synth,"ZS000");

for(next_step=0;next_step<10;next_step++)

{

Output(Synth,"Y"); printf(Press Enter for Next Frequency); getchar();

}

} /* End of main() */

Figure 2-14a. Power-Offset Mode Programming Example (2 of 2)

2-64 683XXC PM

PROGRAMMING WITH USER LEVEL GPIB COMMANDS CALIBRATION COMMANDS

2-19

USER LEVEL CALIBRATION COMMANDS

Table 2-19 lists the user level calibration commands. These commands provide for (1) activating individual user level calibration tables, (2) sending the tables to the controller, and (3) recalling the tables from the controller.

The user level (flatness correction) calibration function provides for calibrating out path variations in a test setup. This is accomplished by means of an entered power-offset table from a GPIB power meter or calculated data. When the user level calibration table is activated, the set power level is delivered to the point in the test setup where the calibration was performed. Up to five user level calibration tables from 2 to 801 frequency points/table can be created and stored in signal generator’s memory for recall. (Refer to Chapter 3 of the 683XXC Operation Manual for user level calibration procedures.)

The commands, LU1 thru LU5, each activate an individual user level calibration table (#1 thru #5). The LU0 command turns off the active user level calibration table. The LUS command sends all five tables of user level calibration data to the controller where they are stored in a binary data file. While stored in the file, the data can be edited (see page 2-69). The LUR command readies the 683XXC to receive the five tables of user level calibration data from the controller. Figures 2-15 thru 2-15b show an example program for saving and recalling user level calibration tables.

Table 2-19. User Level Calibration Commands

MNEMONIC

CODE

LU0 Turns off theactive user level calibration table. LU1 Activates userlevel calibration table #1.

Turns off any other active userlevel calibration table.

LU2 Activates userlevel calibration table #2.

Turns off any other active userlevel calibration table.

LU3 Activates userlevel calibration table #3.

Turns off any other active userlevel calibration table.

LU4 Activates userlevel calibration table #4.

Turns off any other active userlevel calibration table.

LU5 Activates userlevel calibration table #5.

Turns off any other active userlevel calibration table.

LUR Readies the 683XXC to receive five tablesof user level cali-

bration data from the controller.

LUS Sends all five tablesof user level calibration data to the con-

troller.

FUNCTION

683XXC PM 2-65

PROGRAMMING WITH USER LEVEL GPIB COMMANDS CALIBRATION COMMANDS

The following is an exampleprogram for saving and recalling user level calibration tables. This program uses the National Instruments NI-288.2 C language interfacelibrary (mcib.lib) and header (decl.h).

#include <stdio.h> #include decl.h

void gpiberr(char *);

#define BOARD_ID 0 #define USER_LVL_SAVE 1 #define USER_LVL_RECALL 2 #define USER_LVL_NUM_BYTES 8232

void main() {

Addr4882_t source_addr = 5

device_addr[2] = {5, NOADDR}; unsigned char user_lvl_tables[USER_LVL_NUM_BYTES]; init user_lvl_received,

user_input;

FILE *fp_user_lvl_data:

/** Clear the bus and take control.

**/ SendIFC(BOARD_ID); if(ibsta & ERR)

gpiberr(SendIFC error);

/** Set the remote enable line.

**/ EnableRemote(BOARD_ID, device_addr); if(ibsta & ERR)

gpiberr(EnableRemote error);

/** Prompt the user to save or recall the data.

**/ printf(1. Save the data from the source\n); printf(2. Recall the data to the source\n); printf(Option: );

scanf(%d,&user_input);

if(user_input == USER_LVL_SAVE)

{

NOTE: This program is continuedin Figure 2-15a.

Figure 2-15. Programming Example of Saving and Recalling User Level Calibration Tables (1 of 3)

2-66 683XXC PM

PROGRAMMING WITH USER LEVEL GPIB COMMANDS CALIBRATION COMMANDS

/** The LUS command tells the source to send the user level

** table data over the bus.

**/ Send(BOARD_ID, source_addr, LUS\r\n, 5L, DABend); if(ibsta & ERR)

gpiberr(Send error);

/** Receive the user level table data.

**/ printf(Receiving data from the source\n); Receive(BOARD_ID, source_addr, user_lvl_tables,

(long)USER_LVL_NUM_BYTES, STOPend);

if(ibsta & ERR)

gpiberr(Receive error);

user_lvl_received = ibcntl; printf(Received %d bytes of user level data\n,

user_lvl_received);

/** Open binary data file and output the data.

**/ if((fp_user_lvl_data = fopen(userlvl.dat,"w+b")) == NULL)

{ printf(Cant open the userlvl.dat data file\n); }

else

{ printf(Outputting to userlvl.dat in the current

directory\n);

fwrite(user_lvl_tables, sizeof(user_lvl_tables[0]),

USER_LVL_NUM_BYTES, fp_user_lvl_data);

}

else

{ /** Open the binary data file and read the data.

**/ if((fp_user_lvl_data = fopen(userlvl.dat,"rb")) == NULL)

{ printf(Cant open the userlvl.dat data file\n); }

else

{ printf(Inputting from userlvl.dat in the current

directory\n);

fread(user_lvl_tables, sizeof(user_lvl_tables[0]),

USER_LVL_NUM_BYTES, fp_user_lvl_data);

}

NOTE: This program is continuedin Figure 2-15b.

Figure 2-15a. Programming Example of Saving and Recalling User Level Calibration Tables (2 of 3)

683XXC PM 2-67

PROGRAMMING WITH USER LEVEL GPIB COMMANDS CALIBRATION COMMANDS

/** The LUR command readies the source to receive the user

** level table data. Notice that there is no carriage ** return, line feed, or EOI sent with the LUR command.

**/ Send(BOARD_ID, source_addr, LUR, 3L, NULLend); if(ibsta & ERR)

gpiberr(Send error; LUR);

/** The data is sent to the source immediately following the

** LUR command.

**/ printf(Sending %d bytes of data to the source\n,

USER_LVL_NUM_BYTES);

Send(BOARD_ID, source_addr, user_lvl_tables,

(long)USER_LVL_NUM_BYTES, DABend);

if(ibsta & ERR)

gpiberr(Send error; data);

}

fclose(fp_user_lvl_data); exit(0); }/** end of main **/

/**************************************************************************************** ***Name: gpiberr **Desc: Display error code and message for all GPIB operation **Receives: errsta - the error string to display **Returns: nothing **/ void gpiberr(char *errstr) { printf(\n%s\nError code = %d\n,errstr,iberr); }/** end of gpiberr **/

Figure 2-15b. Programming Example of Saving and Recalling User Level Calibration Tables (3 of 3)

2-68 683XXC PM

PROGRAMMING WITH USER LEVEL GPIB COMMANDS CALIBRATION COMMANDS

Editing the Table Data

While stored in the binary data file of the controller, the data of the five user level calibration tables can be edited. An editor that can display the data file in hexadecimal will be needed to perform the edit.

Types of Data Storage Methods

There are three types of data storage methods used for user level calibration data. Each is described in the following paragraphs. (The data item descriptions will refer back to these data types.)

Double:

8 bytes. Most significant byte first. ANSI/IEEE-754 64-bit floating point format.

|S| E | F | where:

S (1 bit) = sign bit, 0 positive, 1 negative E (11 bits) = exponent, biased by 1023 base 10 F (52 bits) = fraction, 0 £F<1

value = [(–1) raised to the S power] ´

[2 raised to the (E – 1023) power] ´ [1+F]

Example:

801 is stored as 40 89 08 00 00 00 00 00, base 16. S=0 E = 408 base 16 = 1032 base 10 F = 0.908 base 16 = 0.564453125 base 10 801=1´ 512 ´ 1.564453125

Integer:

4 bytes. Most significant byte first. Stored as a signed integer. The sign bit is the most significant bit. Negative numbers are stored in 2’s complement form.

Example:

7025 is stored as 00 00 1B 71, base 16. –7025 is stored as FF FF D4 8F, base 16 2’s com

plement.

Short:

2 bytes. Most significant byte first. Stored as a signed short. The sign bit is the most significant bit. Negative numbers are stored in 2’s complement form.

Example:

350 is stored as 01 5E, base 16. –350 is stored as FE A2, base 16.

683XXC PM 2-69

PROGRAMMING WITH USER LEVEL GPIB COMMANDS CALIBRATION COMMANDS

Data Item Descriptions

Each data item contained in the binary data file is described below with the following information:

Data name

Description

Type of data storage

Offset into the data file for each user level

calibration table Data units

Figure 2-16 (page 2-72) shows a printout of a section of the data file that contains each of these data items for user level calibration table #2.

Name: Start Frequency

Description: The starting frequency for each user level calibration. Type: Double Offsets (base 16): Table #1 0006

Table #2 0674 Table #3 0CE2 Table #4 1350 Table #5 19BE

Units: mHz (millihertz)

Name: Stop Frequency

Description: The ending frequency for each user level calibration. Type: Double Offsets (base 16): Table #1 000E

Table #2 067C Table #3 0CEA Table #4 1358 Table #5 19C6

Units: mHz (millihertz)

Name: Frequency Increment

Description: The frequency increment for 1 point. This value = (stop frequency – start frequency) divided by the number of points. Type: Double Offset (base 16): Table #1 0016

Table #2 0684 Table #3 0CF2 Table #4 1360 Table #5 19CE

Units: mHz (millihertz)

2-70 683XXC PM

PROGRAMMING WITH USER LEVEL GPIB COMMANDS CALIBRATION COMMANDS

Name: Number of Points

Description: The number of frequency points. Type: Double Offsets (base 16): Table #1 001E

Table #2 068C Table #3 0CFA Table #4 1368 Table #5 19D6

Units: a value of1=1point

Name: Level Correction Offset

Description: This is the power level that is added to the front panel power before the level correction point table power levels are subtracted. It represents the maximum power deviations read during the calibration. Type: Integer Offsets (base 16): Table #1 0026

Table #2 0694 Table #3 0D02 Table #4 1370 Table #5 19DE

Units: mdB (milli-dB)

Name: Level Correction Point Table

Description: These are the power level correction values with respect to the maximum power deviation read during the calibration. Type: Short (Array of 801 Points) Offsets (base 16): Table #1 002A

Table #2 0698 Table #3 0D06 Table #4 1374 Table #5 19E2

Units: mdB (milli-dB)

683XXC PM 2-71

PROGRAMMING WITH USER LEVEL GPIB COMMANDS CALIBRATION COMMANDS

000640 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000650 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 000660 00 00 00 00 00 00 00 00 00 00 00 00 00 00 BA BE 000670 00 00 DA BE 42 7D 1A 94 A2 00 00 00 42 A2 30 9C 000680 E5 40 00 00 42 6D 1A 94 A2 00 00 00 40 22 00 00 000690 00 00 00 00 00 00 17 83 FF 11 FF 56 FF 56 FF 74 0006A0 FF 93 FF 9C FF F6 00 00 FF C4 D1 21 E8 37 00 00 0006B0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0006C0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0006D0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Printout Explanation

The printout shows a sectionof the user level calibration data file, in hexadecimal, that contains each of the dataitems for user level calibration table #2. The offset into the data file is shown at the left inthe printout.

Offset

0674

: Start Frequency

42 7D 1A 94 A2 00 00 00

Offset

067C

: Stop Frequency

42 A2 30 9C E5 40 00 00

Offset

0684

: Frequency Increment

42 6D 1A 94 A2 00 00 00

Offset

068C

: Number of Points

40 22 00 00 00 00 00 00

Offset

0694

: Level Correction Offset

00 00 17 83

Offset

0698

FF 11

= –0.239 dB

FF 56

= –0.170 dB

FF 56

= –0.170 dB

FF 74

= –0.140 dB

FF 93

= –0.109 dB

FF 9C

= –0.100 dB

FF F6

= –0.010 dB

00 00

=0dB

FF C4

= –0.060 dB

= 6.016 dB

: Level Correction Point Table (9 points)

= 2 GHz

=10GHz

= 1 GHz

= 9 points

Figure 2-16. Printout of a Section of the User Level Calibration Binary Data File

2-72 683XXC PM

PROGRAMMING WITH MASTER-SLAVE GPIB COMMANDS OPERATION COMMANDS

2-20

MASTER-SLAVE OPERATION COMMANDS

Table 2-20 lists the master-slave operation command mnemonic codes. These commands provide for enabling two instruments (68XXXB and/or 68XXXC) that are connected in a master-slave configuration to produce CW and synchronized, swept output signals at a frequency offset.

In a master-slave configuration, one instrument (the Master) controls the other (the Slave) via interface cables between their rear panel AUX I/O and SERIAL I/O connectors. The two units are phase-locked together by connecting them to the same 10 MHz reference time base. (Refer to the 683XXC Operation Manual, Chapter 7—Use With Other Instruments, for master-slave interconnection and operating instructions.)

The parameter entry commands, SLF0 - SLF9 and SLM0 - SLM9, are used to set the F0 - F9 and M0 - M9 frequencies for the Slave unit; the SLDF parameter entry command is used to set the DF parameter for the Slave unit. The main output power level (L1) for the Slave unit is set using the SLV or SLL1 parameter entry command; the alternate sweep power level (L2) for the Slave unit is set using the SLL2 parameter entry command. The S1 command turns on the master-slave mode of operation; the S0 command turns off the Master-Slave mode of operation.

Programming Example:

Programming “SLF15GHSLF28GHSLL13DMS1” sets the Slave unit F1 frequency to 5 GHz, its F2 frequency to 8 GHz, and its output power level to 3 dBm and turns on the master-slave mode of operation. Now, when the Master unit is programmed to perform a F1 to F2 sweep, the Slave unit will produce a synchronous 5 GHz to 8 GHz frequency sweep that has an output power level of 3 dBm.

Programming Note:

Use the SOF parameter entry command only to set the frequency offset for a Slave unit that is (1) slave to a Master unit that is connected to a 360B VNA in a source or dual-source configuration or (2) slave to a Master unit that is programmed to perform nonsequential frequency step sweeps (refer to Special Step Sweep on page 2-22).

Table 2-20. Master-Slave Operation Commands

MNEMONIC

CODE

S0 Turns off the Master-Slave modeof operation. S1 Turns on the Master-Slave mode of operation.

FUNCTION

683XXC PM 2-73

PROGRAMMING WITH SELF TEST GPIB COMMANDS COMMAND

2-21

SELF TEST COMMAND

Table 2-21 lists the self test command mnemonic code. This command provides for executing a signal generator self test.

When a TST command is received, the signal generator performs a self test, then places a “P” (for pass) or a “F” (for fail) on the bus. It also generates six self test results bytes. Figure 2-18 shows the six self test results bytes and identifies the reporting function of each bit.

When self test is completed, bit 7 of Self Test Results Byte 6 and bit 2 of Extended Status Byte 1 are both set. If a failure(s) occurs during self test, the Self Test Results Byte bit(s) reporting the failure(s) and bit 0 of Extended Status Byte 1 are set.

The OSR command returns the six self test results bytes to the controller. Figure 2-17 provides an example of self test command programming.

Programming Note: The “P or “F” character placed on the bus by the signal generator self test must be cleared from the output buffer (read by the controller) before another output command, such as OSR,is sent. If it is not cleared, the first character of the next output will be missing. Line 30 (Figure 2-17) shows clearing of the “P” or “F” character.

Table 2-21. Self Test Command

MNEMONIC

CODE

TST Executes a signal generator self test. Extended Status Byte 1

bit 0 is set ifself test fails; bit 2 is set when self test is complete.

10 OUTPUT 705; “CSB” 20 OUTPUT 705; “TST” 30 ENTER 705; D$ 40 DISP D$ 50 OUTPUT 705; “OSR” 60 ENTER 705 USING “#,B”; A, B, C, D, E, F 70 DISP A; B; C; D; E; F 80 END

Figure 2-17. Self Test Command Programming Example

FUNCTION

2-74 683XXC PM

PROGRAMMING WITH SELF TEST GPIB COMMANDS COMMAND

Self Test Results Byte 1

Sweep Time

Circuitry Failed

Bit 7

(128)

Self Test Results Byte 2

Not Locked

Indicator

Check Failed

Bit 7

(128)

Self Test Results Byte 3

Detector Log

Amp Circuitry

Failed

Bit 7

(128)

A18 Power

Supply is Not

Locked

Bit 6

(64)

Down Converter

Not Locked

Bit 6

(64)

Level Reference

Circuitry

Failed

Bit 6

(64)

Power Supply Voltage(s) are

Out of Reg

Bit 5

(32)

YIG Loop

Circuitry is

Not Locked

Bit 5

(32)

Not Leveled

Detector

Circuitry Failed

Bit 5

(32)

Internal

Failed

Bit 4

(16)

Coarse Loop

Circuitry is

Not Locked

Bit 4

(16)

Delta-F Ramp

Circuitry

Failed

Bit 4

(16)

AM Meter Failed

Bit 3

(8)

Fine Loop Circuitry is

Not Locked

Bit 3

(8)

Center

Frequency

Circuitry Failed

Bit 3

(8)

DVM –10 Volt

Reference

Check Failed

Bit 2

(4)

High Stability

Crystal is

Not Locked

Bit 2

(4)

Marker Switch

Point

Circuitry Failed

Bit 2

(4)

DVM +10 Volt

Reference

Check Failed

Bit 1

(2)

Ext 10 MHz

Not Locked

Bit 1

(2)

Linearizer

Circuitry

Failed

Bit 1

(2)

DVM Ground Offset Check

Failed

Bit 0

(1)

Oven

Not Ready

Bit 0

(1)

FM Loop

Gain

Circuitry Failed

Bit 0

(1)

Self Test Results Byte 4

3.3 - 5.5 GHz Switch Filter

Section or

Level Detector

Circuitry Failed

Bit 7

(128)

2-3.3 GHz

Switch Filter

Section or

Level Detector

Circuitry Failed

Bit 6

(64)

Self Test Results Byte 5

32-40GHz

Section of

Switched

Doubler Module

Failed

Bit 7

(128)

Switched

Doubler Module

or Driver

Circuitry Failed

Bit 6

(64)

Self Test Results Byte 6

Self Test

Complete

Bit 7

(128)

Internal Pulse

Reference

Failed

Bit 6

(64)

Switch Filter

Level Detector

Circuitry Failed

0.01 - 2 GHz Unleveled

Bit 5

(32)

Not Used Source

Quadrupler

Circuitry Failed

Bit 5

(32)

Internal

Failed

RF Was Off

When Self Test

Bit 5

(32)

Range

Bit 4

(16)

Module

or Driver

Bit 4

(16)

Started

Bit 4

(16)

A10 Q5 or

Associated

Circuitry Failed

Bit 3

(8)

Modulator or

Driver Circuitry

on A9 Failed

Bit 3

(8)

Slope DAC or

Associated

Circuitry Failed

Bit 3

(8)

2 - 8.4 GHz

Range

Unleveled and

Not Locked

Bit 2

(4)

13.25 - 20 GHz Switch Filter

Section or

Level Detector

Circuitry Failed

Bit 2

(4)

Sample and

Hold Circuitry

Failed

Bit 2

(4)

8.4 - 20 GHz Range

Unleveled and

Not Locked

Bit 1

(2)

8.4 - 13.25 GHz Switch Filter

Section or Level Detector Circuitry Failed

Bit 1

(2)

20-25GHz

Section of

Switched

Doubler Module

Failed

Bit 1

(2)

2-20GHz

Range

Unleveled and

Not Locked

Bit 0

(1)

5.5 - 8.4 GHz Switch Filter

Section or

Level Detector

Circuitry Failed

Bit 0

(1)

25-32GHz

Section of

Switched

Doubler Module

Failed

Bit 0

(1)

Figure 2-18. Self Test Results Bytes

683XXC PM 2-75

PROGRAMMING WITH MISCELLANEOUS GPIB COMMANDS COMMANDS

2-22

MISCELLANEOUS COMMANDS

Table 2-22 is a list of miscellaneous command mnemonic codes that do not fit into any of the other classifications. These commands provide the following operations:

GPIB Address Change

CW Ramp

Secure Mode

Returning the 683XXC to local control

Instrument Reset

Serial Number Entry

Table 2-22. Miscellaneous Commands

MNEMONIC

CODE

ADD Permits changing of the instrument GPIB address. The

address must be between 1and 30 and must be terminated with ADR.

Programming Example:

Programming “ADD 13 ADR“ changes the instrument GPIB

address to 13. CS0 Turns off the CW ramp. CS1 Turns on the CW ramp. This producesa repetitive 0V to 10V

ramp output to the rearpanel HORIZ OUT connector and pin

1 of the AUX I/Oconnector.

FUNCTION

DS0 Turns on the secure mode. This blanksthe front panel display

of all frequency, power level, and modulation parameters. DS1 Turns off the secure mode and restores the front paneldisplay

of all frequency, power level, and modulation parameters.

RL Returns the 683XXC to local (front panel) control.

RST Resets the 683XXC to its default settings.

NOTE

Sending this command clears thecurrent instrument setup. If this setup isneeded for future testing, save it as a stored setup (paragraph2 -12) before sending RST.

SNR Permits entry of the instrument serial number (SNRnnnnnnX).

The serial number, represented by nnnnnn,must be six

characters in length.

2-76 683XXC PM

PROGRAMMING WITH PROGRAM GPIB COMMANDS ERRORS

2-23

PROGRAM ERRORS

Two types of errors can occur in bus programming—invalid-parameter and syntax. These two error types are described in the following paragraphs.

InvalidParameter

Syntax Syntax errors are those that occur in the formula-

Invalid-parameter errors are those that cause the signal generator to beep. These errors include:

Programming an analog frequency sweep

where the sweep start frequency is greater than the stop frequency. Attempting to enter a frequency, time, or

power level parameter that exceeds the limits of the signal generator. Failing to properly end a parameter entry with

a suitable terminator such as MH, DB, MS, etc.

tion of a program statement, such as writing “EXTTFS” instead of “EXTTRS”.

To prevent misinterpretation of command statements, the signal generator ignores all portions of the command statement following the syntax error.

All commands are ignored until the signal generator receives the Unlisten command (ASCII 63; “?” character) over the bus or until the signal generator is addressed to talk.

683XXC PM 2-77

PROGRAMMING WITH RESET PROGRAMMING GPIB COMMANDS AND DEFAULT CONDITIONS

2-24

RESET PROGRAMMING AND DEFAULT CONDITIONS

Table 2-23 describes the five methods that can be used to reset the signal generator GPIB interface. They provide a means for quickly returning the 683XXC to its default (preprogrammed) operational state.

The default settings for the numeric frequency, sweep time, and power level parameters are the same as those listed in Table 3-1 of the 683XXC Operation Manual.

Figure 2-19 provides an example of a recommended sequence for programming a reset command. Using this command sequence ensures that all parameters and commands assume their preprogrammed state each time reset is desired.

Table 2-23. Resetting the 683XXC GPIB Interface Circuits

Methods of Resetting

GPIB Interface Circuits

1. Pressing the front panel menu RETURN TO LOCAL soft-key.

2. Pressing the front panel System menu RESET soft-key.

Functions

Affected

Bus Messages Local

Instrument state does not change.

Service Request Modes ES0, FB0, PE0, SB0,

SE0, SQ0, UL0, SB0 GTS Local and Local Lockout

Default

Conditions

3. Sending the RST command over the bus.

4. Executing the interface message Device Clear.

5. Turning power on and off.

Same as 2 above Same as 2 above except

that the local bus message is not reset.

Same as 2 above. Same as 2 above except

that the local bus message is not reset.

Same as 2 above. Places the GPIB into the

power-on state. Instrument state does not change.

2-78 683XXC PM

PROGRAMMING WITH PROGRAMMING GPIB COMMANDS EXAMPLES

Sample Coding In Basic

10 CLEAR 705 20 OUTPUT 705; “FUL IL1 L1 10DM”

Explanation of Code

Line 10 sends the DeviceClear bus message.This message clears the signal generator GPIB interface.

Line 20 sends new frontpanel settings: Full Sweep, Internal Leveling, and Output Power Level of 10 dBm.

Figure 2-19. Reset Programming Example

2-25

PROGRAMMING EXAMPLES

Figures 2-20 thru 2-22, on the following pages, provide three examples of GPIB programming using 683XXC command codes.

683XXC PM 2-79

Anritsu 69167B GPIB Programmers Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents