Anritsu 68247B GPIB Programming Manual

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SERIES

682XXB/683XXB

SYNTHESIZED SIGNAL GENERATORS

GPIB PROGRAMMING MANUAL

490 JARVIS DRIVE MORGAN HILL, CA 95037-2809

P/N: 10370-10286

PRINTED: NOVEMBER 1996

REVISION: D

WARRANTY

The WILTRON product(s) listed on the title page is (are) warranted against defects in materials and workmanship for one year from the date of shipment, except for YIG-tuned oscillators and all WILTRON manufactured microwave components, which are warranted for two years.

WILTRON’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 WILTRON for warranty repairs. Obligation is limited to the original purchaser. WILTRON is not liable for consequential damages.

LIMITATION OF WARRANTY

The foregoing warranty does not apply to WILTRON connectors that have failed due to normal wear. Also, the warranty does not apply to defects resulting from improper or inadequate maintenance by the Buyer, unauthorized modification or misu se, or operation outside of the environmental spec ifications 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

WILTRON Company has prepared this manual for use by WILTRON Company personnel and customers as a guide for the proper installation, operation, and maintenance of WILTRON Company equipment and computor programs. The drawings, specifications, and information contained herein are the property of WILTRON Company, and any unauthorized use or disclosure of these drawings, specifications, and information is prohibited; they shall not be reproduced, copied, or used in whole or in part as the basis for manufacture or sale of the equipment or software programs wit hout the prior writtten consent of WILTRON Company.

TABLE OF CONTENTS

Chapter 1 — General GPIB Information

Chapter 1 provides a general description of the General Purpose Interface Bus (GPIB) and the bus

data transfer and control functions. It also contains a listing of the 682XXB/683XXB’s GPIB interface function subset capability and response to IEEE-488 interface function messages. Chapter contents are detailed immediately following the tab.

Chapter 2 — Programming with 682XXB/683XXB GPIB Commands

Chapter 2 provides information for remote operation of the Series 682XXB/683XXB Synthesized Signal Generators via the GPIB using 682XX B/683XXB GPIB commands. All GP IB Product-Specific commands that are accepted and implemented by the 682XXB/683XXB are listed and described by function. Sample programs showing usage of the commands are also included. Chapter contents are detailed immediately follo wing the tab.

Appendix A — Index of GPIB Commands

Appendix A provides an alphabetical index of t he GPIB Product-Specific commands for the 682XXB/683XXB.

682XXB/683XXB PM i/ii

Chapter 1 General GPIB Information

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

Electronic Man ual . . . . . . . . . . . . . . . . . 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 682XXB/683XXB 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 682XXB/683XXB Synthesized Signal Generators 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 recognized by the signal generator with a description of its response. A c omplete listing and description of all 682XXB/683XXB GPIB commands (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 682XXB/683XXB Synthesized Signal Generators Operation Manual, P/N 10370-10284. Refer to that manual for general information about the 682XXB/683XXB, 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 Customer Service for price and availability.

WILTRON

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 682XXB/683XXB’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.

682XXB/683XXB PM 1-3

GENERAL GPIB IEEE-488 INTERFACE INFORMATION BUS DESCRIPTION

IEEE-488 BUS (16 Lines)

DEVICE A

Able to talk, listen, and control

(e.g. COMPUTER)

DEVIC E B

Able to talk and listen

(e.g. 682XXB/683XXB SIGNAL GENERATOR)

DEVICE C

Data Bus (8 signal lines)

Data Byte Transfer Control Bus

(3 sign al l in es )

DATA LINES

HANDSHAKE Lines

Only able to listen

(e.g. OTHER INSTRUMENT**)

DEVICE D

Only able to talk

(e.g. OTHER INSTRUMENT**)

General Interface Management Bus

(5 sign al l in es )

DATA INPUT/OUTPUT, DIO 1 thru DIO 8 DAV - DATA VALID

NRFD - NOT READY FOR DATA* NDAC - NOT DATA ACCEPTED*

IFC - INTERFACE CLEAR ATN - ATTENT ION SRQ - SERVI CE REQUE ST REN - REMOTE ENABLE EOI - END OR IDEN TI FY

* NEGATION IS REPRESENTED BY LOW STATE ON THESE TWO LINES

** IF USED

Figure 1-1. Interface Connections and GPIB Bus Structure

Management CONTROL Lines

1-4 682XXB/683XXB 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 twic e the number of devices connected (in me-

ters), or 20 meters—whichever is less. A maximum data rate of 1 Mb/s across the interface on any signal 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.

682XXB/683XXB 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 device-dependent 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 device-dependent data from another device on the bus when addressed to listen. Any number of GPIB devices can be listeners simultaneously.

Controller

A c on troller 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 devicedependent 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 con trol of the GPIB at anytime.

1-6 682XXB/683XXB 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. T able 1-1 lists these designations.

Table 1-1. Interface Bus Signal Line Designations

DAV NRFD NDAC

ATN IFC SRQ REN EOI

Signal Line

Name

Function

Data Availa ble Not Ready For Data Not Data Accepted

Attention Interface Clear Service Request Remote Enable End Or Identify

Bus Type

Data Bus D IO1–DIO8 Data Input/Output, 1 thru 8 Data Byte

Transfer Control Bus

General Interface Management Bus

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.

682XXB/683XXB 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).

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 line FALSE (high) which they will do at their own

1-8 682XXB/683XXB PM

GENERAL GPIB IEEE-488 INTERFACE INFORMATION BUS DESCRIPTION

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.

682XXB/683XXB 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 682XXB/683XXB signal generators.

Table 1-2. 682XXB/683XXB Interface Function Capability

Function Identifier

AH1 Acceptor Handshake Complete Capability

Function 682XXB/683XXB Capability

SH1 Source Handshake Complete Capabil ity

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-State Drivers 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 682XXB/683XXB PM

GENERAL GPIB IEEE-488 INTERFACE INFORMATION BUS DESCRIPTION

Message Types

There are three types of information transmitted

over the GPIB—interface function messages, devicespecific 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. Inter- face 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.

682XXB/683XXB 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 fuction message, one would call the the National Instruments software driver. On the other hand, the command command string to the addressed device. In the case of the National Instruments example, this would be done by using the

IFC (Interface Clear) interface

ibsic function of

*RST (Reset) is sent in a

ibwrt function call.

1-12 682XXB/683XXB PM

GENERAL GPIB 682XXB/683XXB INFORMATION GPIB OPERATION

1-4

682XXB/683XXB GPIB OPERATION

All Series 682XXB/683XXB Synthesized 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 682XXB/683XXB is listed in Table 1-2 (page 1-10).

Setting GPIB Operating Parameters

Selecting the Interface Language

The 682XXB/683XXB leaves the factory with the GPIB address value set to 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 ( only. Refer to Chapter 2 of the Series 682XXB/ 683XXB Synthesized Signal Generators Operation Manual for the procedure.

Series 682XXB/683XXB Synthesized Signal Generators with Option 19 can be remotely operated us-

ing one of two external interface languages—Native or SCPI. The Native interface language uses a set of 682XXB/683XXB 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 682XXB/683XXB Synthesized Signal Generators Operation Manual for the procedure.

5 and the data delimiting

CR)

Response to GPIB Interface Function Messages

Table 1-3 (page 1-14) lists the GPIB Interface Function Messages that the 682XXB/683XXB will recognize and respond to. With the exception of the Device Clear and Selected Device Clear messages, these messages affect only the operation of th e 682XXB/683XXB GPIB interface. The 682XXB/ 683XXB response for each message is indicated.

Interface function messages are transmitted on the GPIB data lines and interface management lines as either unad dressed 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.

682XXB/683XXB PM 1-13

GENERAL GPIB 682XXB/683XXB INFORMATION GPIB OPERATION

Table 1-3. 682XXB/683XXB Response to GPIB In terface Function Messages

Interface Function Message

Addressed

Command

682XXB/683XXB Response

Device Clear (DCL) Selected Device Clear (SDC)

Go To Local (GTL) Yes Returns the 682XXB/683XXB to

Group Execute Trigger (GET)

Interface Clear (IFC) No Stops the 682XXB/683XXB GPIB

Local Lockout (LLO) No Disables the front panel menu

Remote Enable (REN) No Places the 682XXB/683XXB under

Serial-Poll Enable (SPE) No Outputs the serial-poll status byte. Serial-Poll Disable (SPD) No Disables the serial-p ol l fu nc ti on . Parallel-Poll Configure (PPC) Yes Respo nd s to a para ll el -po ll

Yes

Yes Executes a string of commands, if

Resets the 682XXB/683XXB to its default state. (Equivalent to sending the *RST command.)

local (front panel) control.

programmed.

interface from listening or talking. (The front panel controls are not cleared.)

RETURN TO LOCAL soft-key.

remote (GPIB) control when it has been addressed to listen.

message (PPOLL) by setting assigned data bus line to the logi ca l state (1,0) that indicates its correct SRQ status.

Parallel-Poll Unconfigure (PPU)

No Disables the paralle l-p ol l fu nc ti on .

1-14 682XXB/683XXB PM

Chapter 2 Programming with GPIB Commands

2-1 INTRODUCTION . . . . . . . . . . . . . . . . . . 2-5

2-2 COMMAND CODES . . . . . . . . . . . . . . . . . 2-5

2-3 DATA INPUT RESTRICTIONS . . . . . . . . . . . 2-8

2-4 PARAMETER AND DATA ENTRY COMMANDS . 2-9

Opening a Parameter . . . . . . . . . . . . . . . . 2-9

Data Entry . . . . . . . . . . . . . . . . . . . . . 2-9

Using the SYZ Command . . . . . . . . . . . . . . 2-17

2-5 CW FREQUENCY COMMANDS . . . . . . . . . . 2-18

2-6 ANALOG AND STEP SWEEP COMMANDS . . . . 2-19

Sweep Range . . . . . . . . . . . . . . . . . . . . 2-19

Alternate Sweep . . . . . . . . . . . . . . . . . . . 2 -20

Sweep Triggering . . . . . . . . . . . . . . . . . . 2-20

Analog/Step Sweep Select . . . . . . . . . . . . . 2-22

Special Step Sweep . . . . . . . . . . . . . . . . . 2-24

2-7 FREQUENCY MARKER COMMANDS . . . . . . 2-24

2-8 OUTPUT POWER LEVELING COMMANDS . . . 2-26

RF Output Power Level Selection . . . . . . . . . 2-26

Alternate Sweep RF Output Power Level Selection2-26

Output Power Leveling . . . . . . . . . . . . . . . 2-26

ALC Power Slope . . . . . . . . . . . . . . . . . . 2-29

Attenuator Decoupling . . . . . . . . . . . . . . . 2-29

Table of Contents (Continued)

2-9 MODULATION COMMANDS . . . . . . . . . . . . 2-30

Amplitude Modulation . . . . . . . . . . . . . . . 2-30

Frequency Modulation . . . . . . . . . . . . . . . 2-31

Phase Modulati on . . . . . . . . . . . . . . . . . . 2-32

Pulse Modulati on . . . . . . . . . . . . . . . . . . 2-33

2-10 MEASURE FUNCTION COMMANDS . . . . . . . 2-41

2-11 OUTPUT COMMANDS . . . . . . . . . . . . . . . 2-42

2-12 STORED SETUP COMMANDS . . . . . . . . . . . 2-47

2-13 SRQ AND STATUS BYTE COMMANDS . . . . . . 2-49

Status Bytes . . . . . . . . . . . . . . . . . . . . . 2-49

SRQ Generation . . . . . . . . . . . . . . . . . . . 2-49

2-14 CONFIGURATION COMMANDS . . . . . . . . . . 2-54

2-15 GROUP EXECUTE TRIGGER COMMANDS . . . 2-55 2-16 FAST-FREQUENCY-SWITCHING COMMANDS . 2-56

2-17 POWER-OFFSET-TABLE COMMANDS . . . . . . 2-57

Loading the Power-Offset Table . . . . . . . . . . 2-57

2-18 USER LEVEL CALIBRATION COMMANDS . . . 2-60

Editing the Table Data . . . . . . . . . . . . . . . 2-64

2-19 MASTER-SLAVE OPERATION COMMANDS . . . 2-68

2-20 SELF TEST COMMAND . . . . . . . . . . . . . . 2-69

2-21 MISCELLANEOUS COMMANDS . . . . . . . . . 2-71

2-22 PROGRAM ERRORS . . . . . . . . . . . . . . . . 2 -72

Invalid-Parameter . . . . . . . . . . . . . . . . . 2-72

Syntax . . . . . . . . . . . . . . . . . . . . . . . . 2-72

2-2 682XXB/683XXB PM

Table of Contents (Continued)

2-23 RESET PROGRAMMING AND DEFAULT

CONDITIONS . . . . . . . . . . . . . . . . . . . . 2-73

2-24 PROG RAM MIN G EXAM PL ES . . . . . . . . . . . 2-74

682XXB/683XXB PM 2-3/2-4

Chapter 2 Programming with GPIB Commands

2-1

2-2

INTRODUCTION

COMMAND CODES

This chapter provides information for remote operation of the Series 682XXB/683XXB Synthesized Signal Generators via the GPIB using 682XXB/683XXB GPIB commands. All GPIB Product-Specific commands that are accepted and implemented by the 682XXB/683XXB are listed and described by function. Sample programs showing usage of the commands are also included.

There are over three hundred and fifty GPIB Product-Specific commands that are accepted and implemented by the 682XXB/683XXB. 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:

Table 2-1, beginning on page 2-6, is a listing of all 682XXB/683XXB 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

A quick way to determine the function of any of the GPIB command codes listed in Table 2-1 is to look up the command code of interest in Appendix A of this manual. Appendix A is an alphabetical index of all 682XXB/683XXB GPIB command mnemonic codes. A brief description of the function of each command is also included.

RST (reset).

682XXB/683XXB PM 2-5

PROGRAMMING WITH COMMAND 682XXB/683XXB GPIB COMMANDS CODES

Table 2-1. 682XXB/683XXB 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, F RS, 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

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 2-9

2-4 2-15,

2-16

2-5 2-18

Analog and Step Sweep Commands

Frequency Ma rke r Commands

Output Power Leveling Commands

Modulation Commands

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

ME1, ME0, MK0, IM1, VM1 2-7 2-24

L0, L1, L2, L3, L4, L5, L6, L7, L8, L9, AL0, AL1, AL2, AL3, AL4, AL 5, AL6, AL7, AL8 , AL9, RF1, RF0, LO1, LO0, IL1, DL1, PL1, ELF, ELR, LV0, LSP, AT0, AT1, ATT(x x), 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 2-19

2-8 2-26

2-9 2-30

2-6 682XXB/683XXB PM

PROGRAMMING WITH COMMAND 682XXB/683XXB GPIB COMMANDS CODES

Table 2-1. 682XXB/683XXB GPIB Command Codes Listed by Function (2 of 3)

GPIB Command Group Function

Measure Function Commands

Output Commands OI, OFL, OFH, OF0, OF1, OF2, OF3, OF4,

Stored Setup Commands

Service Request and Status Byte Commands

AMI, FMD, MOM, PM1, PM0 2-10 2-41

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, EL1, EL0, II1, II0, CSB

Command Codes Para. Page

), RCF, RCM,

1-9

)

1-9

2-11 2-42

2-12 2-47

2-13 2-49

Configuration Commands

Group Execute Trigger (GET) Commands

Fast-FrequencySwitching Commands

Power-OffsetTable Commands

User Level Calibration Commands

Master-Slave Operation Commands

Self Test Command

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

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

ZL(X

PT0, PT1, PTC, PTL 2-17 2-57

LU0, LU1, LU2, LU3, LU4, LU5, LUS, LUR 2-18 2-60

S0, S1 2-19 2-68

TST 2-20 2-69

000-999

), ZEL, ZS(X

000-999)

2-14 2-54

2-15 2-55

2-16 2-56

682XXB/683XXB PM 2-7

PROGRAMMING WITH DATA INPUT 682XXB/683XXB GPIB COMMANDS RESTRICTIONS

Table 2-1. 682XXB/683XXB GPIB Command Codes Listed by Function (3 of 3)

2-3

DATA INPUT RESTRICTIONS

GPIB Command Group Function

Miscellaneous Commands

The 682XXB/683XXB 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 commands (paragraph 2-13), the mands (paragraph 2-12), the power-offset-table commands (paragraph 2-17), and the (paragraph 2-18).

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

The 52 upper- and lower-case alphabetic characters. (The 682XXB/ 683XXB 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.

ADD, CS0, CS1, DS0, DS1, RL, RST, SNR 2-21 2-71

Command Codes Para. Page

RCF and RCM stored-setup com-

LUR user level calibration command

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”

“

2-8 682XXB/683XXB PM

PROGRAMMING WITH PARAMETER AND DATA 682XXB/683XXB GPIB COMMANDS ENTRY COMMANDS

2-4

P ARAMETER 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 2-15 and 2-16) 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 used to terminate a numeric-parame ter entry, and it must immediately f ollow the numeric value. If it does not, a parame ter entry error will result.

The parameter and data entry commands do not affect the signal gen-

erator’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 682XXB/683XXB output.

Example: Assume that the 682XXB/683XXB is executing an F3-F4 sweep from 3 GHz to 10 GHz. Changing the value of F1 to 3 GHz with the command string “ the signal generator. However, changing the value of F4 with the command string “ because it changes the end point of the F3-F4 sweep to 16.01 GHz.

F4 16.01 GH” alters the output of the 682XXB/683XXB

F1 3 GH” does not affect the current output of

682XXB/683XXB PM 2-9

PROGRAMMING WITH PARAMETER AND DATA 682XXB/683XXB GPIB COMMANDS ENTRY COMMANDS

Table 2-2. Parameter Entry Commands (1 of 6)

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

TERMINATOR

GH MH KH

DLF

DFF

DFM

Opens the ∆F parameter Opens the ∆F parameter Opens the ∆F 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

2-10 682XXB/683XXB PM

PROGRAMMING WITH PARAMETER AND DATA 682XXB/683XXB GPIB COMMANDS ENTRY COMMANDS

Table 2-2. Parameter Entry Commands (2 of 6)

MNEMONIC

CODE

PARAMETER VALUES TERMINATOR

Slave Unit Frequencies

SLM0 SLM1 SLM2 SLM3 SLM4 SLM5 SLM6 SLM7 SLM8 SLM9

SLDF

SDT Opens the step sweep

SNS Opens the step sweep

SWT Opens the analog sweep

Opens the ∆F parameter for the slave 68XXXB

dwell time parameter

number of steps parameter

and CW ramp time parameter

Dependent on the frequency range of the instrumen t

1 ms to 99s MS

1 to 10,000 SPS

30 ms to 99s MS

GH MH KH

SEC

LOS Op en s th e le ve l 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 inte rnal AM rate

parameter

+100 dB to –100 dB DB

1 ms to 99 sec MS

SEC

1 to 10,000 SPS

0% to 100% PCT

0 dB to 25 dB DB

0.1 Hz to 1 MHz for sine wave;

0.1 Hz to 100 kHz for square, triangle, and ramp waveforms

MH KH

682XXB/683XXB PM 2-11

PROGRAMMING WITH PARAMETER AND DATA 682XXB/683XXB GPIB COMMANDS ENTRY COMMANDS

Table 2-2. Parameter Entry Commands (3 of 6)

MNEMONIC

CODE

AMS Opens the external AM

ASD Opens the external AM

FDV Opens th e in te rna l FM

FMR Opens the internal FM rate

FMS Opens the external FM

PARAMETER VALUES TERMINATOR

%/V sensitivit y pa ram et er

dB/V sensitivit y pa ram eter

deviation parameter

parameter

sensitivity parameter

0 %/V to 100 %/V PCV

0 dB/V to 25 dB/V DV

10 kHz to 20 MHz in Locked, Locked Low-Noise, and Unlocked Narrow FM; 100 kHz to 100 MHz in Unlocked Wi de FM

0.1 Hz to 1 MHz for sine wave;

0.1 Hz to 100 kHz for 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 Wi de FM

KH HZ

PHD

PHR

PHS

Opens the internal ΦM deviation parameter

Opens the internal ΦM rate parameter

Opens the externa l Φ M sensitivity parameter

0.0025 to 5 radians in ΦM Narrow mode;

0.25 to 500 radians in ΦM Wide mode

0.1 Hz to 1 MHz for sine wave;

0.1 Hz to 100 kHz for square, triangle, and ramp waveforms

±0.0025 radians/V to ±5 radians/V in

ΦM Narrow mode; ±0.25 radians/V to ±500 radians/V in ΦM Wide mode

KH HZ

2-12 682XXB/683XXB PM

PROGRAMMING WITH PARAMETER AND DATA 682XXB/683XXB GPIB COMMANDS ENTRY COMMANDS

Table 2-2. Parameter Entry Commands (4 of 6)

MNEMONIC

CODE

PER Opens the internal pulse

PR O p ens the internal puls e

PW, W1

W2 W3 W4

PDY, D1 Opens the inte rna l pu ls e

PARAMETER VALUES

period parameter

frequency param et er

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 paramet er

250 ns to 419 ms at 40 MHz pulse clock rate; 600 ns to 1.6s at 10 MHz pulse clock rate

2.385 Hz to 4 MHz at 40 MHz pulse clock rate;

0.597 Hz to

1.66 MHz at 10 MHz pulse clock rate

25 ns to 419 ms at 40 MHz pulse clock rate; 100 ns to 1.6s at 10 MHz pulse clock rate

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

TERMINATOR

SEC

US NS

KH HZ

SEC

US NS

SEC

US NS

D2 D3 D4

SDD Opens the internal pulse

SDE Opens the internal pulse

Opens the internal pulse delay 2 paramet er Opens the internal pulse delay 3 paramet er Opens the internal pulse delay 4 paramet er

stepped delay mode step size parameter

stepped delay mode delay 1 stop parameter

100 ns to 419 ms at 40 MHz pulse clock rate; 300 ns to 1.6s at 10 MHz pulse clock rate

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

SEC

US NS

SEC

US NS

SEC

US NS

682XXB/683XXB PM 2-13

PROGRAMMING WITH PARAMETER AND DATA 682XXB/683XXB GPIB COMMANDS ENTRY COMMANDS

Table 2-2. Parameter Entry Commands (5 of 6)

MNEMONIC

CODE

SDL Opens the internal pulse

SDS Opens the internal pulse

PVT Opens the ALC power

SLP Opens the ALC power

SOF Opens the frequency

SLV, SLL1 Opens the main power

PARAMETER VALUES

stepped delay mode dwelltime-per-step paramet er

stepped delay mode delay 1 start parameter

slope pivot point frequency parameter

slope value parameter

offset parameter for the slave 68XXXB (in a 360B VNA configuration)

level parameter (L1) for the slave 68XXXB

TERMINATOR

100 µs to 10s

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

Dependent on the frequency range of the instrumen t

0 to 255 SPS

Dependent on the frequency range of the instrumen t

Dependent on the power level range of the instrumen t

SEC

MS US

SEC

MS US NS

KH HZ

SLL2 Opens the alternate sweep

power level parameter (L2) for the slave 68XXXB

EGI Opens the Ref ere nc e

Level DAC setting parameter (in external power leveling mode)

ADD Opens the GPIB address

parameter.

FRS Opens the frequency

scaling reference multiplier parameter

SYZ Opens the st ep -si ze

parameter for updating

UP Increments the open

parameter by the step size

Dependent on the power level range of the instrumen t

0 to 255 SPS

1 to 30 ADR

0.1 to 14 TMS

Dependent on the open parameter

N/A N/A

N/A

2-14 682XXB/683XXB PM

PROGRAMMING WITH PARAMETER AND DATA 682XXB/683XXB GPIB COMMANDS ENTRY COMMANDS

Table 2-2. Parameter Entry Commands (6 of 6)

MNEMONIC

CODE

DN Decrements the op en

CLO Closes the previously

Table 2-3. Data Entry Commands

MNEMONIC

CODE

0, 1, 2, 3, 4,

5, 6, 7, 8, 9

PARAMETER VALUES

parameter by the step size

opened parameter

Numerals for parameter value en tri es

TERMINATOR

N/A N/A

DESCRIPTION

– Change sign of input

. Decimal point

CLR Clear data entry

682XXB/683XXB PM 2-15

PROGRAMMING WITH PARAMETER AND DATA 682XXB/683XXB GPIB COMMANDS ENTRY COMMANDS

Table 2-4. Data T erminator Codes

MNEMONIC

CODE

ADR GPIB Address

DB Decibels (dB) DM dBm GH GHz MH MHz

KH kHz

HZ Hertz (Hz)

SEC Seconds

MS Milliseconds (ms)

NS Nanoseconds (ns)

PCT Percent (%)

Microseconds (µs)

DESCRIPTION

RD Radians GV GHz per volt (GHz/V) MV MHz per volt (MHz/V)

KV kHz per volt (kHz/V)

DV Decibel per volt (dB/V)

PCV Percent per volt (%/V)

RV Radians per volt (rad/V)

SPS Steps

TMS Times

2-16 682XXB/683XXB PM

PROGRAMMING WITH PARAMETER AND DATA 682XXB/683XXB GPIB COMMANDS ENTRY COMMANDS

Using the SYZ Command

Each 682XXB/683XXB 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 ∆F) 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 paramete r, 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 to incre ment a para meter. 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

SYZ command can be used

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 Paramete r 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.

682XXB/683XXB PM 2-17

PROGRAMMING WITH CW FREQUENCY 682XXB/683XXB 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 higher preset

CW frequency.

SQU Scan up to the next higher preset

CW frequency.

SQD Scan down to the next lower

preset CW frequency.

ACW Activates the currently scanned

frequency as CW.

CW frequency pa ram et er then select ed

2-18 682XXB/683XXB PM

PROGRAMMING WITH ANALOG AND STEP 682XXB/683XXB GPIB COMMANDS SWEEP COMMANDS

Programming Note: Signal generator response to a SQF command de- pends on the state that the instrument is in at the time the command is received. For example, if the 682XXB/683XXB is in a CW mode of operation with the current output frequency open for entry, the mand (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 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

Close s the F6 parameter. Places the 682XXB/683XXB at the preset (or previously set) CW F7 parameter and opens the F7 parameter for data entr y.

SQF command

SQF com-

2-6

ANALOG AND STEP SWEEP COMMANDS

Closes the F1 parameter. Places the 682XXB/683XXB at the preset (or previously set ) CW F 6 frequen cy and opens t he F6 parameter for data entry. Sets the F6 frequency to 7 GHz.

Places the 6 82X XB/683XX B at t he pr e set (or previousl y set) CW F1 frequency a nd o pen s t he F1 p a ram et e r fo r d at a ent ry .

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

Table 2-6 (page 2-21) 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

commands select the sweep ranges of F1-F2 and F3F4 respectively; the band sweep from the signal generator’s low frequency limit to its high frequency limit.

DF0, DF1, DF5, and DF6 commands each select

The a symmetrical frequency sweep around F0, F1, F5, and F6 respectively. The width of the sweep is determined by the ∆F frequency parameter.

FUL command selects a full

SF1 and SF3

682XXB/683XXB PM 2-19

PROGRAMMING WITH ANALOG AND STEP 682XXB/683XXB GPIB COMMANDS SWEEP COMMANDS

Programming Examples:

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

F1 2 GH F2 8 GH SF1” sets F1 to

Alternate Sweep

Programming “ 6 GHz, F5 to 7 GHz, and implements a F5-∆F frequency sweep.

Programming Note:

If the commanded sweep range is invalid, a parameter error (paragraph 2-22) 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 ∆F frequency parameter results in a sweep that is outside the range of the instrument.

Six alternate sweep commands are available. If the 682XXB/683XXB 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 682XXB/683XXB had been previously programmed and was then executing an F1F2 sweep. Programming “ the F3-F4 sweep and cause it to alternate with the F1-F2 sweep.

DLF 6 GH F5 7 GH DF5” sets ∆F to

AF3” would then activa te

Programming Note:

An alternate sweep command will only be recognized when the 682XXB/683XXB has been programmed to sweep. It will be ignored at all other times.

Sweep Triggering

Two modes of sweep triggering are available over the bus—Automatic and Single. The lects automatic sweep triggering; the 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.

AUT command se-

EXT command

2-20 682XXB/683XXB PM

PROGRAMMING WITH ANALOG AND STEP 682XXB/683XXB GPIB COMMANDS SWEEP COMMANDS

When single sweep triggering is selected, a single sweep starts when the ceived. 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

TRG or TRS command is re-

MNEMONIC

CODE

SF1 SF3 FUL DF0 DF1 DF5 DF6

AFU

AF1

AF3 AD1 AD5 AD6

AUT EXT TRG TRS RSS

FUNCTION

Sweep Range

Selects the F1-F2 sweep mode Selects the F3-F4 sweep mode Selects the Full Range sweep mode Selects the F0 - ∆F sweep mode Selects the F1 - ∆F sweep mode Selects the F5 - ∆F sweep mode Selects the F6 - ∆F sweep mode

Alternate Sweep

Selects Full Range alternate sweep Selects F1-F2 alternat e swe ep Selects F3-F4 alternat e swe ep Selects F1-∆F alternate sweep Selects F5-∆F alternate sweep Selects F6-∆F alternate sweep

Sweep Triggering

Selects Auto T rigger Selects Single Trigger Trigge rs a Sin gl e Swee p Trigge rs a Sin gl e Swee p Resets a Sweep if i n progress

OPENS

FOR ENTRY

None None None None None None None

None None None None None None

None None None None None

Analog/Step Sweep Select

SWP

SSP

MAN

DU1 DU0 TSS

SP1 SP0

Selects Analog Sweep (683XXB onl y) Selects Step Sweep Selects Manual (Step) Sweep Selects Dual Step Sweep mode Deselects D ua l S tep Sweep mode Steps to next point in DU1 mode

Special Step Sweep (Steps Not Equ al ly Spac ed )

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

None None None None None None

None None

682XXB/683XXB PM 2-21

PROGRAMMING WITH ANALOG AND STEP 682XXB/683XXB GPIB COMMANDS SWEEP COMMANDS

Analog/Step Sweep Select

Three commands are available—SWP selects an analog sweep, lects 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 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 682XXB/683XXB for a manual sweep. It must be accompanied by the ment to local (front panel) control in order for the operator to perform the manual sweep.

SSP selects a step sweep, and MAN se-

NOTE

Series 683XXB signal gene rators can produce analog, step, and manual sweeps; series 682XXB signal generators can produce only step and manual sweeps.

SWP or SSP does not, by itself,

MAN command only provides for setting up the

RL command to return the instru-

SF1

Figure 2-3. Example of a Sweep Command String

AUT SWP EXT TRS SSP TRS

Selects ANALOG sweep.

Selects AUTO triggering.

Selects the F1-F2 sweep range.

Triggers a single sweep.

Selects step sweep.

Triggers a single sweep.

Selects the External/Single triggering mode.

2-22 682XXB/683XXB PM

PROGRAMMING WITH ANALOG AND STEP 682XXB/683XXB GPIB COMMANDS SWEEP COMMANDS

Dual Step Sweep Mode

The dual step sweep mode provides for generating synchronized, step sweep outputs from two 682XXB/ 683XXBs at a frequency offset. Figure 2-4 shows an example of dual step sweep pr ogramming.

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 682XXB/683XXB’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 682XXB/683XXB’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

682XXB/683XXB PM 2-23

PROGRAMMING WITH FREQUENCY 682XXB/683XXB GPIB COMMANDS MARKER COMMANDS

Special Ste p Sweep

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

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-∆F, F1-∆F, F5-∆F, and F6-∆F). The start fre- quency in this sweep must be equal to the first frequency programmed with the ZL(X (Table 2-16). The intermediate steps can be programmed to be any frequency within the range of the programmed sweep.

Programming Note:

SP1 command can be used with the dual step

The 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 the step frequencies.

Line 20 sets start and stop frequencies and number of steps (frequency points – 1). Line 30 set the signal generator 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.

ME1 command will enable a marker at the current frequency that

The is open for update; the a frequency parameter is not open, no action will be taken. The and VM1 commands will turn on their respective intensity and video markers. The

Series 683XXB signal generators can produce video and intensity markers; series 682XXB signal generators can produce only video markers.

MK0 command will turn all markers off.

ME0 command will disable the same marker. If

IM1

NOTE

2-24 682XXB/683XXB PM

PROGRAMMING WITH FREQUENCY

VM1 F1 ME0 F7 ME1 F4 ME1 MK0

Turns on the video-marker mode.

Disables the F1 frequency marker.

Enables the F7 frequency marker.

Enables the F4 frequency marker.

Turns both markers off, but leaves the F7 and F4 markers enabled. Therefore, when VM1 is next programmed, two frequency markers will reappear on the display — provided their frequencies are within the 682XXB/683XXB's sweep range.

682XXB/683XXB 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 the active frequency

(F0-F9 or M0-M9) ME0 Disables the marker at the active frequency None MK0 Turns off markers. Enabled markers remain

enabled, but are not active

IM1 Turns on the intensity marker mode (683XXB

only) VM1 Turns on the video marker mode None

FUNCTION

OPENS FOR

ENTRY

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.

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

682XXB/683XXB PM 2-25

PROGRAMMING WITH OUTPUT POWER 682XXB/683XXB 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 an RF output power level, (2) leveling the output power and (3) turning the output power leveling off. In addition, commands are provided for the level offset, ALC power slope, and step attenuator decoupling functions.

Figure 2-7 (page 2-29) shows an example of an output power level command string.

RF Output Power Level Selection

Alternate Sweep RF Output Power Level Selection

The commands, (or previously set) output power levels. Each command causes its associated RF power level to be out-

put 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.

In the alternate sweep mode, the commands, 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, thru L9, to enter new power level values.

L0 thru L9, call up each of the preset

AL0

XL0 thru XL9 or L0

Output Power Leveling

There are three output power leveling mod es of operation—internal, external (detector or power meter), and fixed gain (leveling off). The 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.

DL1 command selects the external (detector) lev-

The eling mode; the (power meter) leveling mode. In this mode, the output power is leveled using a signal from an external detector (power meter) connected to the

ALC IN

mode, the parameter entry command for entering a setting for the Reference Level DAC to control the ALC gain. The fixed gain (leveling off) mode. Each command will also deselect any other previously programmed output power leveling mode.

connector. In the external power leveling

PL1 command selects the external

LV0 command selects the

IL1 command

EXTERNAL

EGI provides

2-26 682XXB/683XXB PM

PROGRAMMING WITH OUTPUT POWER 682XXB/683XXB GPIB COMMANDS LEVELING COMMANDS

Programming Example:

Programming “ 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)

PL1 EGI 140 SPS” selects external

MNEMONIC

CODE

L0 L1 L2 L3 L4 L5 L6 L7 L8 L9

AL0 AL1 AL2 AL3 AL4 AL5 AL6 AL7 AL8 AL9

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

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

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

mode.)

FUNCTION

OPENS FOR

ENTRY

L0 L1 L2 L3 L4 L5 L6 L7 L8 L9

None None None None None None None None None None

None

RF0 Turns off the RF output. None LO1 Turns on the Level Offset function. The value of

the Level Offset parameter is added to the level measured by the int ern al le veling loop. The resultant power level value is displayed.

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 PL1 leveling modes, if previously programmed.

None

682XXB/683XXB PM 2-27

PROGRAMMING WITH OUTPUT POWER 682XXB/683XXB GPIB COMMANDS LEVELING COMMANDS

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

MNEMONIC

CODE

DL1 Selects external leveling of the output power,

using a signal from an external detector connected to the EXT ERNAL ALC IN co nn ec to r. Deselects th e IL 1 or PL1 l ev el in g modes, if previously programmed.

PL1 Selects external leveling of the output power

using a signal from an external power meter connected to the EXT ERNAL ALC IN co nn ec to r. Deselects the IL1 and DL1leveling modes, if previously programmed.

ELF Selects front panel external leveling input. None

ELR Selects rear panel external leveling input. None

L V0 Turns off leveling of the output power. None

LSP Selects the Power Sweep mode. The power

level will sweep as determined by the preset (or previously set) dwell-time and number-of-s teps parameters.

AT1 Selects ALC step attenuator decoupling. None

FUNCTION

OPENS

FOR ENTRY

None

AT0 Deselects ALC step attenuator decoupling. None

ATT(xx)

SL1 Turns on the ALC po wer sl ope function. None SL0 Turns off t he ALC po w er sl op e function. None

EGO Outputs the value of the Reference Level DAC

Sets step attenuator value to xx (×10 dB) in the ALC step attenuator decouple mode. xx is an unsigned integer between 00 (0 dB attenuation) and 11 (110 dB attenuation).

setting in external power leveling mode

None

2-28 682XXB/683XXB PM

PROGRAMMING WITH OUTPUT POWER 682XXB/683XXB 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 slope function. The power slope value and the pivot point frequency are changed using the parameter entry commands. The SL0 command turns off the ALC power slope function.

Programming Example:

Programming “ turns on the ALC p ow er sl op e fu n c ti o n a nd se ts th e 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 attenuator, the ting the attenuation in 10 dB increments, and the AT0 command deselects the attenuator decoupling function.

Programming Example:

Programming “ tenuator from th e ALC sy st em a nd set s th e s tep a t tenuator value to 80 dB.

SL1 command turns on t he ALC pow er

SLP and PVT

SL1 SLP 128 SPS PVT 2.0 GH”

AT1 command decouples the step

ATT(xx) command provides for set-

AT1 ATT08” decouples the step at-

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

682XXB/683XXB PM 2-29

PROGRAMMING WITH MODULATION 682XXB/683XXB GPIB COMMANDS COMMANDS

2-9

MODULATION COMMANDS

Table 2-9 (page 2-35) lists the modulation command mnemonic codes. These commands p ro vid e f or AM, FM, ΦM, and pulse modulation of

the signal generator’s output signal using modulating signals from either the internal AM, FM, ΦM, and pulse generators or an external source.

Amplitude Modulation

T wo 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

AM7 command tur n s on the intern a l AM f u n c-

The tion in Linear mode. The 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 ter entry command. The modulating waveform is selected using the is set with the turns off the AM function.

AMW(x) command and the AM rate

AMR command. The AM0 command

AM8 command turns on

ADP2 parame-

Programming Example:

Programming “

” 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

AM1 command turns on the external AM fu nc -

The tion in Linear mode. The the external AM function in Log mode. In Linear mode, the external AM sensitivity value is changed using the mode, the external AM sensitivity value is changed using the command turns off the AM f un ction .

Programming Example:

Programming “ on the external AM function in Linear mode, selects the front panel external AM input, selects an input impedance of 50Ω, and sets the external AM sensitiv- ity to 90 %/V.

AM8 ADP2 20 DB AMW7 AMR 10

AM2 command turns on

AMS parameter entry command. In Log ASD parameter entry command. The AM0

AM1 AM3 AM5 AMS 90 PCV” turns

2-30 682XXB/683XXB PM

PROGRAMMING WITH MODULATION 682XXB/683XXB GPIB COMMANDS COMMANDS

Frequency Modulation

Four FM modes are available—Locked, Locked LowNoise, 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 YIG-tuned 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

FM7 command turns on the internal FM func-

The tion in Unlocked Narrow mode, the turns it on in Unlocked Wide mode, the mand turns it on in Locked mode, and the mand turns it on in Locked Low-Noise mode. The FM deviation value is changed using the rameter entry command. The mo dulating waveform is selected using the nal FM rate is set using the command. The tion.

Programming Example:

Programming “

” 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.

FWV(x) command and the inter-

FMR parameter entry

FM0 command turns off the FM func-

FM9 FDV 20 MH FWV1 FMR 100

FM8 command

FM9 com-

FMN com-

FDV pa-

682XXB/683XXB PM 2-31

PROGRAMMING WITH MODULATION 682XXB/683XXB GPIB COMMANDS COMMANDS

External FM Function

FM1 (or FMU) command turns on the external

The FM function in Unlocked Narrow mode, the 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 command turns off the FM function.

Programming Example:

Programming “ on the external FM funct ion in Unlocked Wide mode, selects the rear panel FM input, selects an input impedance of 600Ω , and sets the external FM sensitivity to 50 MHz/V.

FMS parameter entry command. The FM0

FMW FM4 FM6 FMS 50 MV” turns

FMW

NOTE

If the ΦM function (Option 6) is not installed in the signal generator, the ΦM function commands pro- duce syntax errors.

Phase Modulation

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

Internal ΦM Function

PH7 command turns on the internal ΦM func-

The tion in Narrow mode and the on in Wide mode. The mand is used to change the ΦM deviation value. The modulating waveform is selected with the command and the ΦM rate is set using the PHR parameter entry command. The off the ΦM function.

Programming Example:

Programming “ turns on the internal ΦM function in Narrow mode, sets the ΦM deviation to 3 radians, selects a sine wave as the modulating waveform, and sets the ΦM rate to 200 kHz.

PH7 PHD 3 RD PHV1 PHR 200 KH”

PHD parameter entry com-

PH8 command turns it

PHV(x)

PH0 command turns

External ΦM Function

PH1 (or PHN) command turns on the external

The ΦM function in Narrow mode and the command turns it on Wide mode. The external ΦM sensitivity value is changed using the ter entry command. The lect front panel or rear panel external ΦM input.

PH3 and PH4 commands se-

PH2 (or PHW) PHS parame-

2-32 682XXB/683XXB PM

PROGRAMMING WITH MODULATION 682XXB/683XXB GPIB COMMANDS COMMANDS

Programming Example

Programming “ the external ΦM function in Wide mode, selects the rear panel ΦM input, selects an input impedance of 50Ω, and sets the external ΦM sensitivity to 50 radians/V.

PH2 PH4 PH5 PHS 50 RV” turns on

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 produc es 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 682XXB/ 683XXB Operation Manual for a description of each trigger mode.)

Internal Pulse Modulation Function

IP command turns on the internal pulse modula-

The tion function. The internal pulse mode is selected us-

NOTE

At a 40 MHz pulse clock rate, the pulse period must be 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.

ing the trigger is selected using the pulse period can be set using the try command; the pulse frequency can be set using the widths can be set using the and pulse delays can be set using the

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

tion.

PMD(x) command and the internal pulse

PTG(x) command. The

PER parameter en-

PR parameter entry command. Individual pulse

W1 (or PW), W2, W3,

W4 parameter entry commands. Individual

D1 (or PDY), D2,

682XXB/683XXB PM 2-33

PROGRAMMING WITH MODULATION 682XXB/683XXB 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

NOTE

Use the select the polarity of the signal (TTL-low or TTL-high) that turns the RF on during pulse modulation.

EP0 and EP1 commands to

27.8 kHz.

Programming Example:

Programming “

2.5 US D2 10 US W2 2 US

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 µs, delay2 to 10 µs, and pulse width2 to 2 µs.

IP PC4 PMD2 PTG1 PER 1 MS W1

” turns on the internal

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

PTG5 (triggered with delay) are specified. The

or SD1 command turns on the stepped delay mode. The pulse delay 1 start time can be set using the rameter entry command; the delay 1 stop time can be set using the Use the step size and the set the dwell-time-per-step. The turns off the stepped delay mode.

Programming Notes:

Use the the pulse trigger commands (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 select front panel or rear panel external trigger pulse input.

SDD parameter entry command to set the

PTR and PTF commands in conjunction with

P3 (or SW5) and P4 (or SW6) commands to

SDE parameter entry command.

SDL parameter entry command to

PTG2 (gated), PTG4

PTG3 (delayed)

SDS pa-

SD0 command

2-34 682XXB/683XXB PM

PROGRAMMING WITH MODULATION 682XXB/683XXB GPIB COMMANDS COMMANDS

External Pulse Modulation Function

XP command turns on the external pulse modu-

The lation function. The commands select front panel or rear panel external pulse input. The pulse modulation function.

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

P3 (or SW5) and P4 (or SW6)

PO (or SW0) command turns off the

MNEMONIC

CODE

AM0 Turns off the internal or external AM function. (This is the

default mode.)

AM1 Turns on the external AM function in Linear mode.

Disables the internal AM function or the external AM function in Log mode, had either of these modes been previously programmed.

AM2 Turns on the external AM function in Log mode.

Disables the internal AM function or the external AM function in Linear mode , had either of these modes been previously

programmed. AM3 Selects front panel external AM input. AM4 Selects rear panel external AM input. AM5 AM6 AM7 Turns on the internal AM function in Linear mode.

Selects external AM in put impedance of 5 0Ω .

Selects external AM in put impedance of 6 00 Ω.

Disables the external AM function or the internal AM function

in Log mode, had either of these modes been previously

programmed.

FUNCTION

AM8 Turns on the internal AM function in Log mode.

Disables the external AM function or the internal AM function

in Linear mode , had either of these modes been previously

programmed.

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

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

5-Gaussian noise, 6-uniform noise, 7-triangle wave. FM0 Turns off the internal or exte rnal FM function. (This is the

default mode.)

682XXB/683XXB PM 2-35

PROGRAMMING WITH MODULATION 682XXB/683XXB 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 generat or ou tp ut is no t ph as e-l oc ke d. ) Disables the internal FM function or the external FM function in Unlocked Wide, Locked, or Locked Low-Noise mode, had any of these modes been previously programmed.

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

(The signal generat or ou tp ut is ph as e-l oc ke d. ) Disa bles the internal FM function or the external 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 FM6 FM7 Turns on the internal FM function in Unlocked Narrow mode.

Selects exter nal FM input impedance of 50Ω.

Selects exter nal FM input impedance of 600Ω.

(The signal generat or ou tp ut is no t ph as e-l oc ke d. )

Disables the external FM function or the internal FM function in

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

of these modes been previously programmed.

FUNCTION

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

(The signal generator is not phase-locked.)

Disables the external FM function or the internal FM function in

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

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

generator output is phase-locked.)

Disables the external FM function or the internal FM function in

Unlocked Narrow, Unlocked Wide, or Locked Low-No is e mo de ,

had any of these modes been previously programmed. FMN Turns on the internal FM function in Locked Low-Noise mode.

(The signal generator is phas e-locked.)

Disables the external FM function or 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 generat or ou tp ut is no t ph as e-l oc ke d. )

Disables the internal FM function or the external FM function in

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

any of these modes been previously programmed.

2-36 682XXB/683XXB PM

PROGRAMMING WITH MODULATION 682XXB/683XXB 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 generat or ou tp ut is ph as e-l oc ke d. ) Disables the internal FM function or the external FM function in Unlocked Narrow, Unlocked Wide, or Locked Low-No is e mo de , had any of these modes been previously programmed.

FMU Same as FM1. Turns on the external FM function in Unlocked

Narrow mode. (The signal generator output is not phaselocked.) Disables the internal FM function or the external FM function in Unloc ke d Wi de , Locked, or Locked Low- Noise mode, had any of these modes been previously programmed.

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

2-square wave, 3-positive ra mp , 4- n eg ative ramp, 5-Gaussian noise, 6-uniform noise, 7-triangle wave

PH0

PH1

Turns off the internal or external ΦM function. (This is the default mode.) If the ΦM function (Option 6) is not installed, this command produces a syntax error.

Turns on the extern al ΦM function in Narrow mode. Disables the internal in Wide mode, had either of these modes been previously programmed. If the ΦM function (Option 6) is not installed, this command produces a syntax error.

FUNCTION

ΦM function or the external ΦM function

PH2

PH3

PH4

PH5

Turns on the extern al ΦM function in Wide mode. Disables the internal ΦM function or the external ΦM function in Narrow mode, had either of these modes been previously programmed. If the ΦM function (Option 6) is not installed, this command produces a syntax error.

Selects front panel external ΦM input. If the ΦM function (Option 6) is not installed, this command produces a syntax error.

Selects rear panel external ΦM input. If the ΦM function (Option 6) is not installed, this command produces a syntax error.

Selects external ΦM input impedance of 50Ω. If the ΦM function (Option 6) is not installed, this command produces a syntax error.

682XXB/683XXB PM 2-37

PROGRAMMING WITH MODULATION 682XXB/683XXB GPIB COMMANDS COMMANDS

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

MNEMONIC

CODE

PH6

PH7

PH8

PHN

FUNCTION

Selects external ΦM input impedance of 600Ω.

If the ΦM function (Option 6) is not installed, this command

produces a syntax error.

Turns on the int ernal ΦM function in Narrow mode.

Disables the external ΦM function or the internal ΦM function in

Wide mode, had either of these modes been previously

programmed.

If the ΦM function (Option 6) is not installed, this command

produces a syntax error.

Turns on the int ernal ΦM function in Wide mode.

Disables the external ΦM function or the internal ΦM function in

Narrow mode, had either of these modes been previously

programmed.

If the ΦM function (Option 6) is not installed, this command

produces a syntax error.

Same as PH1. Turns on th e e xt ernal Φ M function in Narrow

mode. Disable s the internal

function in Wide mode, had either of these modes been

previously programmed.

If the ΦM function (Option 6) is not installed, this command

produces a syntax error.

ΦM function or the external ΦM

PHW

PHV(x)

P0 Turns off the internal or externa l pulse modulation function.

IP Turns on the internal pulse modulation function.

XP Turns on the external pulse modulation function.

Same as PH2. Turns on th e e xt ernal Φ M function in Wide

mode. Disable s the internal ΦM function or the external ΦM

function in Narrow mode, had either of these modes been

previously programmed.

If the ΦM function (Option 6) is not installed, this command

produces a syntax error.

Selects the interna l Φ M waveform, where x = 1-sine wave,

2-square wave, 3-positive ra mp , 4- n eg ative ramp,

5-Gaussian noise, 6-uniform noise, 7-triangle wave

If the ΦM function (Option 6) is not installed, this command

produces a syntax error.

(This is the default mode.)

Disables the external pulse modulation function, if previously

programmed.

Disables the internal pulse modulation function, if previously

programmed.

2-38 682XXB/683XXB PM

PROGRAMMING WITH MODULATION 682XXB/683XXB GPIB COMMANDS COMMANDS

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

MNEMONIC

CODE

P3 Selects front panel external pulse input to pulse modulate the

RF output signal or to trigger or gate the internal pulse generator.

P4 Selects rear panel external pulse input to pulse modulate the

RF output signal or to trigger or gate the internal pulse

generator. PC1 Selects the 10 MHz internal pu ls e ge ne rator clock rate. PC4 Selects the 40 MHz internal pu ls e ge ne rator clock rate.

PMD(x) Selects the inte rna l pu ls e mo de , w he r e x = 1-s in gl e, 2- do ub le t,

3- triplet, 4-quadruplet.

PTG(x) Se le ct s the internal pulse tri gg er, where x = 1-free run, 2-gated,

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

external input. Active only when pulse trigger is gated,

triggered, or trigg ere d wit h de la y. PTF Selects internal pulse triggering on th e fa ll in g ed ge of an

external input. Active only when pulse trigger is gated,

triggered, or trigg ere d wit h de la y.

FUNCTION

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

to gated, and turns on the internal pulse modulation functi on.

Disables the external pulse modulation function, if previously

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

to triggered with de la y, and turns on the internal pulse

modulation function.

Disables the external pulse modulation function, if previously

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

pulse modulation is on and the pulse trigger is “delayed” or

“triiger with delay.”

SQP Turns on internal 1 kHz sq ua re w av e pu ls e mo du lation. Sets

the internal pulse width1 to 500 µs, PRF to 1 kHz, pulse mo de

to single, pulse tri gg er to fr ee run, and turn s on the int ern al

pulse modulation function.

Disables the external pulse modulation function, if previously

programmed.

682XXB/683XXB PM 2-39

PROGRAMMING WITH MODULATION 682XXB/683XXB 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 squar e wave pulse modulation. Sets

the internal pulse width1 to 1.25 µs, PRF to 400 Hz, pulse mode to single, trigger to free run, pulse clock rate to 40 MHz, and turns on the internal pulse modulation function. Disables the external pulse modulation function, if previously programmed.

SW2 Same as SQP. Turns on internal 1 kHz square wa ve pu ls e

modulation. Sets the internal pulse width1 to 500 µs, PRF to 1 kHz, pulse mode to single, pulse tr igger to free ru n, and turns on the internal pu ls e mo du la ti on function. Disables the external pulse modulation function, if previously programmed.

SW3 Turns on internal 7.8125 kHz square wave pulse modulation.

Sets the internal pulse width1 to 64 µs, PRF to 7.8125 kHz, pulse mode to single, pulse trigger to free run, and turns on the internal pulse modulation function. Disables the external pulse modulation function, if previously programmed.

FUNCTION

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

the internal pulse width1 to 18 µs, PRF to 27.8 kHz, pulse mode to single, pulse trigger to free run, pulse clock rate to 40 MHz, and turns on th e in ternal pulse modula ti on f un ct io n. Disables the external pulse modulation function, if previously programmed.

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

modulate the RF output signal or to trigger or gate the internal pulse generat or.

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

modulate the RF output signal or to trigger or gate the internal pulse generat or.

SC0 Turns SCAN modulation function off. If the SCAN Modulator

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

SC1 Turns SCAN modulation function on. If the SCAN Modulator

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

2-40 682XXB/683XXB PM

PROGRAMMING WITH MEASURE 682XXB/683XXB 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 Meas ure me nt mo de . I n t hi s m od e, th e s ig na l

generator measures the voltage of the external modulating signal and calcul ates the modulatio n depth of the RF output signal. The measurement results will be sent to the controller upon receipt of the OMM command (Table 2-11). When the AMI command is received, measurements will continue to be tak en until the mode is exited by receipt of the MOM command.

FUNCTION

FMD Turns on the FM Measurement mode. In this mode, the signal

generator measures the voltage of the external modulating signal and calculates the peak frequency deviation of the RF output signal. The measurement results will be sent to the controller upon receipt of the OMM command (Table 2-11). When the FMD command is received, measurements will continue to be tak en until the mode is exited by receipt of the MOM command.

MOM Turns off the AM and FM measurement modes.

PM1 Turns on the Power Meter Measure ment mode (Option 8),

whereby RF power can be measured at an external source by a 560-7, 5400-71, or 4600-71 Series Detector c onnected to the rear panel POWER METER connector. The measurement results will be sent to the controller upon receipt of the OPM command (Table 2-11). Power measurements can be taken simultaneously with modulation measurements.

PM0 Turns off the Power Meter Measu rem en t mo de .

682XXB/683XXB PM 2-41

PROGRAMMING WITH OUTPUT 682XXB/683XXB GPIB COMMANDS COMMANDS

2-11

OUTPUT COMMANDS

Table 2-11 lists the output command mnemonic codes. These commands prov ide for the output of data from the signal generator to the controller. Figure 2-8 (page 2-47) shows examples of output command programming.

Table 2-11. Output Commands (1 of 5)

MNEMONIC

CODE

OI Causes the signal generator to identify itself by sending the

following parameter infor mation over the bus; model number, low-end frequency, high-end frequency, minimum output power level, maximum out pu t po wer level, software rev is io n nu mb er, serial number, model prefix (A or B), and serie s (2 o r 3). This command can be used to send parameter information to the controller automatically, thus relieving the operator from having to input the information manually. The string is 34 characters

long. OFL Returns the low-end frequency value (in MHz) to the controller. OFH Returns the high-end frequency value (in MHz) to the

controller. OF0 Returns the F0 frequency value (in MHz) to the controller.

FUNCTION

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

OM0 Returns the M0 freq ue nc y va lu e (in MHz) to the controll er. OM1 Returns the M1 freq ue nc y va lu e (in MHz) to the controll er. OM2 Returns the M2 freq ue nc y va lu e (in MHz) to the controll er. OM3 Returns the M3 freq ue nc y va lu e (in MHz) to the controll er. OM4 Returns the M4 freq ue nc y va lu e (in MHz) to the controll er.

2-42 682XXB/683XXB PM

PROGRAMMING WITH OUTPUT 682XXB/683XXB GPIB COMMANDS COMMANDS

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

MNEMONIC

CODE

OM5 Returns the M5 freq ue nc y va lu e (in MHz) to the controll er. OM6 Returns the M6 freq ue nc y va lu e (in MHz) to the controll er. OM7 Returns the M7 freq ue nc y va lu e (in MHz) to the controll er. OM8 Returns the M8 freq ue nc y va lu e (in MHz) to the controll er. OM9 Returns the M9 freq ue nc y va lu e (in MHz) to the controll er.

OL0 Returns the L0 power value (in dBm) to the controller. OL1 Returns the L1 power value (in dBm) to the controller. OL2 Returns the L2 power value (in dBm) to the controller. OL3 Returns the L3 power value (in dBm) to the controller. OL4 Returns the L4 power value (in dBm) to the controller. OL5 Returns the L5 power value (in dBm) to the controller. OL6 Returns the L6 power value (in dBm) to the controller. OL7 Returns the L7 power value (in dBm) to the controller.

FUNCTION

OL8 Returns the L8 power value (in dBm) to the controller.

OL9 Returns the L9 power value (in dBm) to the controller. OLO Returns the Level Offset power value (in dB) to the controller. ODF OPD Returns the dwell time of the power sweep (in ms) to the

OPS Returns the number-of-steps of th e po w er swe ep to th e

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

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

OST Returns the sweep time value (in ms) to the controller.

OAD1 Returns the internal AM depth value (in %) to the controller.

Returns the ∆F frequency valu e (in MHz) to the controller.

controller.

682XXB/683XXB PM 2-43

PROGRAMMING WITH OUTPUT 682XXB/683XXB GPIB COMMANDS COMMANDS

Table 2-11. Output Commands (3 of 5)

MNEMONIC

CODE

OAD2 Returns the internal AM depth va lu e (i n d B) to th e c ontro ll er.

OAR Returns the internal AM rat e (i n Hz ) to th e c on tro ll er.

OAW Returns the na me of th e i nternal AM waveform ("SINE",

"SQUARE WAVE", "RAMP UP", "RAMP DOWN", "GAUSSIAN NOISE", "UNIFORM NOISE", "TRIANGLE") to the controller.

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

controller.

OAB Returns the external AM sen sit i vity va lue (in dB) to the

controller.

OAI

OAE Returns the name of the AM so urc e (" FR ON T ", " R EAR",

OFD Returns the inter nal FM deviation value (in Hz) to the controller. OFR Returns the internal FM rate (in Hz) to the controller.

Returns the exte rna l AM im pe da nc e v al ue (i n Ω) to the controller.

"INTERNAL" ) to the controller.

FUNCTION

OFW Returns the name of the internal FM waveform ("SINE",

"SQUARE WAVE", "RAMP UP", "RAMP DOWN", "GAUSSIAN NOISE", "UNIFORM NOISE", "TRIANGLE") to the controller.

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

NARROW", "UNLOCKED WIDE", "LOCKED") to the controller.

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

controller.

OFI

OFE Returns the name of the FM source ("FRONT", "REAR",

OPHD

OPHR

OPHW

Returns the external FM impedance value (in Ω) to the controller.

"INTERNAL" ) to the controller. Returns the internal ΦM de vi at ion value (in radians) to t he

controller Returns the internal ΦM rate (in Hz) to th e cont rol le r. Returns the name of the internal ΦM waveform ("SINE".

"SQUARE WAVE", "RAMP UP", "RAMP DOWN", "GAUSSIAN NOISE", "UNIFORM NOISE", "TRIANGLE") to the controller.

2-44 682XXB/683XXB PM

PROGRAMMING WITH OUTPUT 682XXB/683XXB GPIB COMMANDS COMMANDS

Tab le 2- 11. Output Commands (4 of 5)

MNEMONIC

CODE

OPHM

OPHS

OPHI

OPHE

OPR Returns the internal pulse frequen c y (in MHz) to the controller. OPP

OPW, OW1

OW2 OW3 OW4

Returns the internal or external ΦM mode ("NARROW", "WIDE") to the controller.

Returns the external ΦM sensitivity value (in radians/V) to the controller.

Returns the external ΦM impedance valu e (in Ω) to the controller.

Returns the name of the ΦM source ("FRONT", "REAR", "INTERNAL") to the co nt rol le r.

Returns the internal pulse period (in µs) to the co ntroller. Returns the internal pulse wid th1 value (in µs) to the controller. Returns the internal pulse wid th2 value (in µs) to the controller. Returns the internal pulse wid th3 value (in µs) to the controller. Returns the internal pulse wid th4 value (in µs) to the controller.

FUNCTION

ODP, OD1

OD2 OD3 OD4

ODD Returns the internal pulse stepped delay mo de step size value

ODE Returns the internal pulse stepped delay mode delay 1 stop

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

ODS Returns the internal pulse stepped delay mode delay 1 start

OMD Returns the name of the internal pulse mode ("SINGLE",

OPC Returns the internal pulse clock rate (in MHz) to the controller.

Returns the internal pulse delay1 value (in µs) to the controller . Returns the internal pulse delay2 value (in µs) to the controller . Returns the internal pulse delay3 value (in µs) to the controller . Returns the internal pulse delay4 value (in µs) to the controller .

(in µs) to the controller.

value (in µs) to the controller.

step value (in ms) to the controller.

value (in µs) to the controller.

"DOUBLET", "TRIPLET","QUADRUPLET") to the controller.

682XXB/683XXB PM 2-45

PROGRAMMING WITH OUTPUT 682XXB/683XXB GPIB COMMANDS COMMANDS

Tab le 2- 11. Output Commands (5 of 5)

MNEMONIC

CODE

OPM Returns the internal power meter measurement value (in dBm)

to the controlle r.

OPT Returns the name of the internal pulse trigger ("FREE RUN",

"GATED", "DELAYED", "TRIGGERED", "TRIG WITH DELAY", "COMPOSITE") to the controller.

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

to the controlle r.

OP3 Returns the name of the pulse source ("FRONT", "REAR",

"INTERNAL FRONT T RIG" , "INT ERNAL REAR 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 deviation measurement 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 GPIB termin at ion status to the co nt rol le r. (0=CR;

1=CRLF)

FUNCTION

OSE Returns the last GPIB syntax error to the controller.

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.

OSB Returns the Primary GPIB Status byte to the controller. OSM Returns the Primary SRQ Mask byte to the controller. OSR Returns the self-test results (6 bina ry bytes) to the c ontroller.

2-46 682XXB/683XXB PM

PROGRAMMING WITH STORED SETUP 682XXB/683XXB GPIB COMMANDS COMMANDS

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

2-12

STORED SETU P COMMANDS

Table 2-12 (page 2-48) lists the stored setup command mnemonic codes. These commands provide for saving instrument setups and recalling them for use.

A current instrument setup can be saved to internal setup memory using the to nine instrument setups ca n 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 682XXB/683XXB can be commanded to output and accept stored setups over the bus.

The ler in a 3000-byte (approximately) binary data string. The controller stores the instrument setup. The erator to receive a new instrument setup recalled from the controller. Figure 2-9 shows an example of

The for the ment setups are included in the binary data string along with the current instrument setup. For these commands, the binary data st ring is approximately 30000 bytes long.

SSN(M

) recalls a stored instrument setup from internal setup

1 to 9

SAF command outputs the current instrument setup to the control-

SAM and RCM commands perform the same functions as described

SAF and RCF commands, except that all of the stored instru-

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

1 to 9

RCF command readies the signal gen-

SAF and RCF command programming.

682XXB/683XXB PM 2-47

PROGRAMMING WITH STORED SETUP 682XXB/683XXB GPIB COMMANDS COMMANDS

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

instrument setups to the controller.

SM Recalls the next stored instrument setup in sequence.

SSN(M

RSN(M

) Saves the current instrument setup to internal setup memory

1-9

location M, where M = 1 to 9.

RCF Readies the 682XXB/683XXB to receiv e a ne w ins tru ment

setup recalled from the controller.

RCM Readies the 682XXB/68 3XXB to receiv e a ne w ins tru ment

setup and new stored setups recalled from the controller.

) Recalls the instrument setup stored in internal setup memory

1-9

location M, where M = 1 to 9.

FUNCTION

Programming Note: The SAF and SAM commands output binary

data. The data string is terminated with “

CR or LF is sent).

(no

EOI” on the last byte 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

2-48 682XXB/683XXB PM

PROGRAMMING WITH SRQ AND STATUS 682XXB/683XXB GPIB COMMANDS BYTE COMMANDS

2-13

SRQ AND STATUS BYTE COMMANDS

Table 2-13 (page 2-51) 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 682XXB/683XXB has three GPIB status bytes—

the primary 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 returned to the controller in response to a serial poll or the The contents of the primary status byte and the two extended status bytes are returned to the controller in response to the mand. Figure 2-1 1 (page 2-52) shows an example of OES command progr amming.

OSB command.

OES com-

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

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

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 ( enable any or all of the primary status byte bits.

Figure 2-12 (page 2-53) shows examples of status byte mask programming.

SQ1 command and,

FB1/FB0,

MB0) to

682XXB/683XXB PM 2-49

PROGRAMMING WITH SRQ AND STATUS 682XXB/683XXB GPIB COMMANDS BYTE COMMANDS

NOTE

All status byte bi ts are latched except for those indicated wit h the “*”. Once set, an OES or OSB command must be received before the condition will be reset. The pri mary status byte bit 6 (SRQ) is cleared by a se rial poll only.

Primary Status Byte

Extended

Status Byte 2

Bit 7

(128)

Primary status byt e bi t 0 is set wh en ev er on e of the status conditions reported by an extended status byte 1 is true and the associated status bit is enabled. This bit is cleared when the controller sends the OES command.

Primary status byt e bi t 7 is set wh en ev er on e of the status conditions reported by an extended status byte 2 is true and the associated status bit is enabled. This bit is cleared when the controller sends the OES command.

Primary status byt e bi t 6 (SR Q) is no t ma sk ab le . Th is bit is set by the SQ1 co mmand and cleared by a serial poll.

Extended Status Byte 1

Not

Used

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 bits are en abled by the extended status byte 1 mask command, MB1.

Extended status byte 1 bit 0 (SelfTest Failed) and bit 2 (Self Test Complete) should not be unmasked at the same time.

Extended status byte 1 bit 3 (RF Locked) is only used with the Model 360B interface. The setti ng of this bit is blocke d or un bl oc ked by the commands , L S0 and LS1 (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 bits are en abled by the extended status byte 2 mask command, MB2.

The setting of extended status byte 2 bit 4 (RF Unlocked) is blocked or unblocked by the commands, EL0 and EL1 (See Table 2-13).

Extended status byte 2 bit 7 (Parameter Changed) is only used with the Model 562 interface. The setting of this bit is blocked or unbloc ke d b y t he commands, II0 and II1 (See Table 2-13).

Figure 2-10. Primary and Extended Status Bytes

Not

Used

Bit 0

(1)

2-50 682XXB/683XXB PM

PROGRAMMING WITH SRQ AND STATUS 682XXB/683XXB 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 Sta tus Byte bi t

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

ES0 Inhibits an SRQ fro m be in g ge ne rat ed wh en the End of Sweep

bit is set. This is the 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 Byte 1 bit is set whenever one (or more) of the unmasked status reporting functions in Extended Status Byte 1 is true.

FB0 Inhibits an SRQ fro m be in g ge ne rat ed when the Extended

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

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

3 (Lock Error) is set and SQ1 has been programmed.

LE0 Inhibits an SRQ from being generat ed when the Lock Error bi t

is set. This is the default mode.

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

the Primary Status Byte (Figure 2-12). This enables any or all of the bits (except for bit 6) in the Primary Status Byte to generate an SRQ using one 8-bit byt e. This command can be equivalent to se nding ES1, FB1, LE1, PE1, SE1, SB1, and UL1.

FUNCTION

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

PE1 Enables an SRQ to be generated when Primary Sta tus Byte bi t

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

PE0 Inhibits an SRQ from bein g ge ne rat ed when the Param et er

Range Error bit is set. This is t he de fa ul t m od e.

SB1 Enables an SRQ to be generated when Primary Sta tus Byte bi t

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

SB0 Inhibits an SRQ fro m be in g ge ne rat ed wh en the Exte nd ed

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

SE1 Enables an SRQ to be generated when Primary Sta tus Byte bi t

5 (Syntax Error) is set and SQ1 has been prog ramme d.

682XXB/683XXB PM 2-51

PROGRAMMING WITH SRQ AND STATUS 682XXB/683XXB GPIB COMMANDS BYTE COMMANDS

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

MNEMONIC

CODE

SE0 Inhibits an SRQ from being gen erate d whe n th e Synta x Error

bit is set. This is the default mode.

SQ1 Enables the SRQ generat io n fu nction. This command a ll ow s a

status reporting function, that is true and enabled, to pull the SRQ line LOW (tru e) and request service from th e 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 set and SQ1 has been programmed.

UL0 Inhibits an SRQ from being generated when the RF Unleveled

bit is set. This is the default mode.

LS1 Unblocks updating of the Ext en de d Sta t u s Byt e 1 bi t 3 (RF

Locked). This bit is only use d wit h th e M od el 36 0B i nterface.

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

the default sett in g.

EL1 Unblocks updating of the Ext en de d Sta t u s Byt e 2 bi t 4 (RF

Unlocked).

FUNCTION

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

the default setting because it is normal for the RF to be momentarily unlocked during sweeps and sweep retrace.

II1 Unb locks updating of th e Extended Status Byte 2 bit 7

(Parameter Changed). This bit is only used with the Model 562 interface. This bit is cleared when the 562 sends the OCP command (Output La st Param et er Cha ng ed ) .

II0 Disables updating of the Extended Status Byte2 bit 7. This is

the default sett in g.

CSB Clears all GPIB status bytes.

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

Figure 2-11. OES Command Programming Example

2-52 682XXB/683XXB PM

PROGRAMMING WITH SRQ AND STATUS 682XXB/683XXB GPIB COMMANDS BYTE COMMANDS

The 682XXB/683XXB has a software mask that permits manipulation of the three status bytes over the bus. This manipulation is accomplished by sending the command codes 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 shown below:

EXTENDED STATUS BYTE 2

"1"

"2"

"4"

"8"

"16"

"32"

"64"

"128"

PRIMARY

STATUS

BYTE BIT 7

CALIBRATE FUNCTION FAILED

CRYSTAL OVEN FAILURE

RF UNLOCKED

CALIBRATE FUNCTION FINISHED

PARAMETER CHANGED

0 0 1

0 0 0

EXAMPLE #1

0 1 1

0 0 0

EXAMPLE #2

MASK BYTE 2

2 3

4 5

6 7

1 2 3

5 6 7

EXAMPLE #1: "MB2" (CHR $(24))

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

EXAMPLE #2: "MB2" (CHR $(12))

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

Figure 2-12. Status Byte Mask Programming Examples

682XXB/683XXB PM 2-53

PROGRAMMING WITH CONFIGURATION 682XXB/683XXB 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 and step sweep modes. RF on or RF off during sweep retrace. RF on or RF off at reset.

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

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

outputs. (The retrace blanking output signal is available at pin 6 of the AUX I/O connector; the bandswitch blanking output signal at pin 20 o f t he AUX I/O connector.)

FUNCTION

BPP Selects a +5V level for the retrace and bandswitch blanking

outputs. EP0 Selects TTL-low to turn RF on during pulse modulation. EP1 Selects TTL-high to turn RF on during pulse modulation. FRS Permits setting the frequency scaling reference multiplier

value. The multiplier value must be between 0.1 to 14 and

must be terminated with TMS.

Programming Example:

Programming "FRS 3 TMS" se ts th e fr eq ue nc y sc aling

reference multip li er to 3.

This command affects all entered and displayed frequencies,

but does not affec t the output of the instrument.

PPO Selects normally-open contacts on the internal penlift relay.

(The penlift relay out pu t, optionally availa bl e at the rear pa ne l,

is used to lift a plotter pen during retrace.) PPC Selects normally-closed contacts on the internal penlift relay. RC0 Selects RF to be off during frequency switching in CW and

step sweep modes.

2-54 682XXB/683XXB PM

PROGRAMMING WITH GROUP EXECUTE 682XXB/683XXB GPIB COMMANDS TRIGGER COMMANDS

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

2-15

GROUP EXECUTE TRIGGER COMMANDS

MNEMONIC

CODE

RC1 Selects RF to be on during frequency switching in CW and

step sweep modes. RT0 Selects RF to be off during retrace. RT1 Selects RF to be on during retrace.

RO0 Selects RF to be on at reset. (This is th e default mode.) RO1 Selects RF to be off at reset.

FUNCTION

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 682XXB/683XXB responds to a GET message by triggering a single sweep.

Table 2-15. Group Execute Trigger Commands (1 of 2)

MNEMONIC

CODE

FUNCTION

GTC Configures the 682XXB/683XXB to execute a SQF command

(scan to the next higher preset CW frequency) each time a GET messag e is re ce iv ed.

GTD Configures the 682XXB/683XXB to execute a DN command

(steps the open parameter down by the step size) each time a GET messag e is re ce iv ed.

GTF Configures the 682XXB/683XXB to execute a fast-freq ue ncy-

switching step (Table 2-16) each time a GET message is received.

GTL Configures the 682XXB/683XXB to execute a TSS co mman d

(steps to the next point in a dual step sweep mode) each time a GET message is received.

GTO Disab les the GET functions.

GTS Configures the 682XXB/68 3XXB to execu te a T R S comman d

(trigger a single sweep) each time a GET message is received. This is the default mode.

682XXB/683XXB PM 2-55

PROGRAMMING WITH FAST-FREQUENCY682XXB/683XXB GPIB COMMANDS SWITCHING COMMANDS

Table 2-15. Group Execute Trigger Commands (2 of 2)

2-16

FAST-FREQUENCYSWITCHING COMMANDS

MNEMONIC

CODE

GTT Configures the 682XXB/683XXB to execute a TST command

(execute a complete signal generator self tes t) each time a GET messag e is re ce iv ed.

GTU Configures the 682XXB/683XXB to execute a UP command

(steps the open parameter up by the step size) each tim e a GET messag e is re ce iv ed.

Y Sending a “Y” is equivalent to se nd in g a GET.

FUNCTION

Table 2-16 lists the fast-frequency-switching command mnemonic codes. These commands provide for reducing the time that it takes to switch between two CW frequencies.

In the fast-frequency-switching mode, up to 1000 frequencies can be loaded into a stack. A stack pointer can then be set to point to a specific frequency on the stack and the signal generator commanded to switch from that frequency through the following stack frequencies to the bottom of the stack. Figure 2-13 provides an example of fast-frequencyswitching programming.

Table 2-16. Fast-Frequency-Switching Commands

MNEMONIC

CODE

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 from 000 to 999.

) Sets the stac k po in te r t o po in t to loc at ion X. The location i s a

number from 000 to 999.

FUNCTION

OUTPUT 705; “ZL000” . . . Set pointer for load OUTPUT 705; “10 GH, 11 GH, 12 GH, 13 GH” OUTPUT 705; “ZEL GTF” NEW OUTPUT 705; “ZS000” . . . Set pointer to start

TRIGGER 705; . . . . Sets 10 GHz

TRIGGER 705; . . . . Sets 11 GHz

TRIGGER 705; . . . . Sets 12 GHz

TRIGGER 705; . . . . Sets 13 GHz

GO TO NEW

Figure 2-13. Fast-Frequency-Switching Programming Example

2-56 682XXB/683XXB PM

PROGRAMMING WITH POWER-OFFSET682XXB/683XXB GPIB COMMANDS TABLE COMMANDS

2-17

POWER-OFFSETTABLE COMMANDS

Table 2-17 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 2-16). 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 turns on the power-offset mode; the

Loadin g 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 “clch” and “dldh” are two-byte binary words sent LOW byte first and HIGH byte second. The poweroffset 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 power- offset word for the current power level setting.

PT0 command turns it off.

“dldh” is a power-offset word. Both

PT1 command

Programming Note:

Care must be taken to send the exact number of power-offset words specified in the wordcount, 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 2-17. Power-Offset-Table Commands

MNEMONIC

CODE

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

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

the new offse t word for th e current table entry.

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

data word count and dldh is the data word.

FUNCTION

“clch”.

682XXB/683XXB PM 2-57

PROGRAMMING WITH POWER-OFFSET682XXB/683XXB GPIB COMMANDS TABLE COMMANDS

The following is an ex am pl e of pow e r-offset mode prog ram ming . This program is written fo r us e wit h an I BM-PC ty pe computer/controller containing an IOtech GPIB interface.

#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 continued in Figure 2-14a.

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

2-58 682XXB/683XXB PM

PROGRAMMING WITH POWER-OFFSET682XXB/683XXB GPIB 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)

682XXB/683XXB PM 2-59

PROGRAMMING WITH USER LEVEL 682XXB/683XXB GPIB COMMANDS CALIBRATION COMMANDS

2-18

USER LEVEL CALIBRATION COMMANDS

Table 2-18 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 gener-

ator’s memory for recall. (Refer to Chapter 3 of the 682XXB/683XXB Operation Manual for user level calibration procedures.)

The commands, calibration table (#1 thru #5). The user level calibration table. The 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 2-64). The 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.

LU1 thru LU5, each activate an individual user level

LU0 command turns off the active

LUS command sends all five tables of

LUR command readies the 682XXB/683XXB to receive

Table 2-18. User Level Calibration Commands

MNEMONIC

CODE

LU0 Turns off the active user level calibration table. LU1 Activates user level calibration table #1.

Turns off any other active user level calibration table.

LU2 Activates user level calibration table #2.

Turns off any other active user level calibration table.

LU3 Activates user level calibration table #3.

Turns off any other active user level calibration table.

LU4 Activates user level calibration table #4.

Turns off any other active user level calibration table.

LU5 Activates user level calibration table #5.

Turns off any other active user level calibration table.

LUR Readies the 682XXB/683XXB to rece iv e fi ve tab le s of use r

level calibra tion data from the controller.

LUS Sends all five tables of user level calibration data to the

controller.

FUNCTION

2-60 682XXB/683XXB PM

PROGRAMMING WITH USER LEVEL 682XXB/683XXB GPIB COMMANDS CALIBRATION COMMANDS

The following is an example program for saving and recalling user level calibration tables. This program uses the National Instruments NI-288.2 C language interface library (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 continued in Figure 2-15a.

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

682XXB/683XXB PM 2-61

PROGRAMMING WITH USER LEVEL 682XXB/683XXB 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 continued in Figure 2-15b.

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

2-62 682XXB/683XXB PM

PROGRAMMING WITH USER LEVEL 682XXB/683XXB 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)

682XXB/683XXB PM 2-63

PROGRAMMING WITH USER LEVEL 682XXB/683XXB 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.

2-64 682XXB/683XXB PM

PROGRAMMING WITH USER LEVEL 682XXB/683XXB 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 2-67) 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 Table #2 0674 Table #3 0CE2 Table #4 1350 Table #5 19BE Units: mHz (millihertz)

0006

Name: Stop Frequency

Description: The ending frequency for each user level calibration. Type: Double Offsets (base 16): Table #1 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 Table #2 0684 Table #3 0CF2 Table #4 1360 Table #5 19CE Units: mHz (millihertz)

000E

0016

682XXB/683XXB PM 2-65

PROGRAMMING WITH USER LEVEL 682XXB/683XXB GPIB COMMANDS CALIBRATION COMMANDS

Name: Number of Points

Description: The number of frequency points. Type: Double Offsets (base 16): Table #1 Table #2 068C Table #3 0CFA Table #4 1368 Table #5 19D6 Units: a value of 1 = 1 point

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 Table #2 0694 Table #3 0D02 Table #4 1370 Table #5 19DE Units: mdB (milli-dB)

001E

0026

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 Table #2 0698 Table #3 0D06 Table #4 1374 Table #5 19E2 Units: mdB (milli-dB)

002A

2-66 682XXB/683XXB PM

PROGRAMMING WITH USER LEVEL 682XXB/683XXB 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 section of the user level calibration data file, in hexadecimal, that contains each of the data items for user level calibration table #2. The offset into the data file is shown at the left in the printout.

Offset 0674: Start Frequency 42 7D 1A 94 A2 00 00 00 = 2 GHz

Offset 067C: Stop Frequency 42 A2 30 9C E5 40 00 00 = 10 GHz

Offset 0684: Frequency Increment 42 6D 1A 94 A2 00 00 00 = 1 GHz

Offset 068C: Number of Points 40 22 00 00 00 00 00 00 = 9 points

Offset 0694: Level Correct io n O ffset 00 00 17 83 = 6.016 dB

Offset 0698: Level Correction Point Table (9 points)

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 = 0 dB FF C4 = –0.060 dB

Figure 2-16. Printout of a Section of the User Level Calibration Binary Data File

682XXB/683XXB PM 2-67

PROGRAMMING WITH MASTER-SLAVE 682XXB/683XXB GPIB COMMANDS OPERATION COMMANDS

2-19

MASTER-SLAVE OPERATION COMMANDS

Table 2-19 lists the master-slave operation command mnemonic codes. These commands provide for enabling two 68XXXBs 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 68XXXB (the Master) controls the other (the Slave) via interface cables between their rear panel 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

682XXB/683XXB Operation Manual, Chapter 7—Use With Other Instruments, for master-slave interconnection and operating instructions.)

The parameter entry commands, used to set the F0 - F9 and M0 - M9 frequencies for the Slave 68XXXB;

SLDF parameter entry command is used to set the ∆F parameter

the for the Slave instrument. The main output power level (L1) for the Slave unit is set using the alternate sweep power level (L2) for the Slave unit is set using the SLL2 parameter entry command. The S1 command turns on the mas- ter-slave mode of operation; the Slave mode of operation.

Programming Example:

Programming “ Slave 68XXXB 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 68XXXB 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.

SLF1 5 GH SLF2 8 GH SLL1 3 DM S1” sets the

SLV or SLL1 parameter entry command; the

SLF0 - SLF9 and SLM0 - SLM9, are

S0 command turns off the Master-

AUX I/O

Programming Note:

Use the for a Slave unit that is (1) slave to a Master 68XXXB that is connected to a 360B VNA in a source or dual-source configuration or (2) slave to a Master 68XXXB that is programmed to perform non-sequential frequency step sweeps (refer to Special Step Sweep on page 2-24).

Table 2-19. Master-Slave Operation Commands

SOF parameter entry command only to set the frequency offset

MNEMONIC

CODE

S0 Turns off the Master-Slave mode of op era ti on. S1 Turns on the Master-Slave mode of operati on .

FUNCTION

2-68 682XXB/683XXB PM

PROGRAMMING WITH SELF TEST 682XXB/683XXB GPIB COMMANDS COMMAND

2-20

SELF TEST COMMAND

Table 2-20 lists the self test command mnemonic code. This command provides for executing a signal generator self test.

When a

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 (page 2-70) 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 ler. 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 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.

TST command is received, the signal generator performs a self

OSR command returns the six self test results bytes to the control-

OSR, is

Table 2-20. Self Test Command

MNEMONIC

CODE

TST Executes a signal generator self test. Extended Status Byte 1

bit 0 is set if self 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

682XXB/683XXB PM 2-69

PROGRAMMING WITH SELF TEST 682XXB/683XXB 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 Swit c h

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 - 40 GHz

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

or Level Detector Circuitry Failed

Bit 5

(32)

Not Used Not Used Modulator or

Bit 5

(32)

Internal

Failed

Bit 5

(32)

0.01 - 2 GHz Range

Unleveled

Bit 4

(16)

Bit 4

(16)

RF Was Off

When Self Test

Started

Bit 4

(16)

A10 Q5 or

Associated

Circuitry Failed

Bit 3

(8)

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 - 25 GHz

Section of

Switched

Doubler Module

Failed

Bit 1

(2)

2 - 20 GHz

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 - 32 GHz

Section of

Switched

Doubler Module

Failed

Bit 0

(1)

Figure 2-18. Self Test Results Bytes

2-70 682XXB/683XXB PM

PROGRAMMING WITH MISCELLANEOUS 682XXB/683XXB GPIB COMMANDS COMMANDS

2-21

MISCELLANEOUS COMMANDS

Table 2-21 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 682XXB/683XXB to local control Instrument Reset Serial Number Entry

Table 2-21. Miscellaneous Commands

MNEMONIC

CODE

ADD Permits changing of the instrument GPIB address. The

address must be between 1 and 30 and must be terminated with ADR.

Programming Example:

Programming “ADD 13 ADR" changes the instrum en t G PIB

address to 13. CS0 Turns off the CW ramp. CS1 Turns on the CW ramp. This produces a repetitive 0V to 10V

ramp output to the rear panel HORIZ OUT connector and pin 1

of the AUX I/O connector.

FUNCTION

DS0 Turns on the secure mode. This blanks the front panel display

of all frequency, power level, and m odulation parameters. DS1 Turns off the secure mode and restores the front panel disp la y

of all frequency, power level, and m odulation parameters.

RL Returns the 682XXB/683XXB to local (front panel) control.

RST Resets the 682XXB/683XXB to its default settings.

NOTE

Sending this command clears the current instrument setup. If this setup is needed for future testing, save it as a stored setup (paragraph 2 -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.

682XXB/683XXB PM 2-71

PROGRAMMING WITH PROGRAM 682XXB/683XXB GPIB COMMANDS ERRORS

2-22

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.

2-72 682XXB/683XXB PM

PROGRAMMING WITH RESET PROGRAMMING 682XXB/683XXB GPIB COMMANDS AND DEFAULT CONDITIONS

2-23

RESET PROGRAMMING AND DEFAULT CONDITIONS

Table 2-22 describes the five methods that can be used to reset the signal generator GPIB interface. They provide a means for quickly returning the 682XXB/683XXB to its default (preprogrammed) operational state.

The default settings for th e numeric frequency, sweep time, and power level parameters are the same as those listed in Table 3-1 of the 682XXB/683XXB Operation Manual.

Figure 2-19 provides an example of a recommended sequence for programming a reset command. Using th is command sequence ensures that all parameters and commands assume their preprogrammed state each time reset is desired.

Table 2-22. Resetting the 682XXB/683XXB 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 com mand over the bus.

4. Executing the interface message Device Clear.

5. Turnin g p owe r on and off.

Same as 2 above Same as 2 above except

that the loca l bu s message is not reset.

Same as 2 above. Same as 2 abov e ex ce pt

that the loca l bu s message is not reset.

Same as 2 above. Places the GPI B int o th e

power-on state. Instrument state does not change.

682XXB/683XXB PM 2-73

PROGRAMMING WITH PROGRAMMING 682XXB/683XXB GPIB COMMANDS EXAMPLES

Sample Coding In Basic

10 CLEAR 705 20 OUTPUT 705; "FUL IL1 L1 10DM"

Explanation of Code

Line 10 sends the Device Clear bus message.This message clears the signal generator GPIB interface.

Line 20 sends new front panel settings: Full Sweep, Internal Leveling, and Output Power Level of 10 dBm.

Figure 2-19. Reset Programming Example

2-24

PROGRAMMING EXAMPLES

Figures 2-20 thru 2-22, on the following pages, provide three examples of GPIB programming using 682XXB/683XXB command codes.

2-74 682XXB/683XXB PM

PROGRAMMING WITH PROGRAMMING 682XXB/683XXB GPIB COMMANDS EXAMPLES

The following subroutine uses the output identify (OI) command to identify the

signal generator’s model number, serial number, minimum and maximum frequencies, minimum an d ma ximum power leve l, and software revis io n l ev el . T hi s s ubroutine is used in the example programs in Figures 2-21 and 2-22 to read the limits of the signal generator.

10 ! "GET OI" 20 ! Gets the output id string 30 ! from a 68XXXX Signal Generator 100 OUTPUT 705; "OI" 110 DIM A$[36] 120 ENTER 705; A$ 130 M$=A$[1,2] ! Model 140 M1$=A$[3,4] ! Model Number 150 F1$=A$[5,9] ! Freq Low 160 F2$=A$[10,14] ! Freq High 170 L2$=A$[15,20] ! Min Power 180 L1$=A$[21,24] ! Max Power 190 S$=A$[25,28] ! Software Ver 200 S1$=A$[29,34] ! Serial Number 210 P$=A$[35,35] ! Model Prefix 220 S2$=A$[36] ! Series 230 PRINT "Model Number :";M$;S2$;M1$;P$ 240 PRINT "Serial Number :";S1$ 250 PRINT "Low Freq :";F1$ 260 PRINT "High Freq :";F2$ 270 PRINT "Max Power :";L1$ 280 PRINT "Min Power :";L2$ 290 PRINT "Software Ver :";S$ 300 END

Program Explanation

Line 100: Line 110: Line 120: Line 130: Line 140: Line 150: Line 160: Line 170: Line 180: Line 190: Line 200: Line 210: Line 220: Lines 230-290:

Figure 2-20. Using the Output Identify (OI) Command

Sends the "OI" command.

Dimensions the variable.

Gets the "OI" string. Sets M$ to the model (68). Sets M1$ to the model number. Sets F1$ to the signal generator low-end frequency. Sets F2$ to the signal generator high-end frequency . Sets L2$ to the minimum power point. Sets L1$ to the maximum power point. Sets S$ to the software version number. Sets S1$ to the serial number. Sets P$ to the model prefix number ( 2 or 3). Sets S2$ to the model series (A or B).

Prints the data obtained.

682XXB/683XXB PM 2-75

PROGRAMMING WITH PROGRAMMING 682XXB/683XXB GPIB COMMANDS EXAMPLES

Program Explanation

Line 30:

nal generator.

Line 40:

subroutine described in Line 1010.

Line 50: Lines 60-110:

quency entry an d ch ec ks it s val id ity.

Lines 120-170:

entry and checks its validity.

Line 180:

the starting frequency and step size.

Lines 190-240:

labels.

Line 250:

pressed.

Line 300:

key was pressed; sends the UP command.

Line 310: Line 320:

DOWN key was pressed; send the DN command.

Line 330: Line 340: Lines 1010-1120:

generator address , mo de l, f req ue nc y range, and power range.

Sets the address of the sig Calls the device ide ntification Turns off the key definitions.

Accept the startin g fr e-

Accept the step size

Sets the signal genera to r to

Set up keys and key Waits for a key to be Reports that the STEP UP

Waits for the next key.

Reports that the STEP

Waits for the next key. Ends the main program.

Identify the signal

The following program (1) receives entries from the keyboard to set intial frequency and step-size parameters, and (2) activates the soft keys on the controller so that they can step the frequency up or down.

20 ! PARAMETER ENTRY, SYZ, UP, AND DN COMMANDS 30 Address=705 40 CALL Iddev(Address,Model,Fmin,Fmax,Pmin,Pmax) 50 OFF KEY 60 DISP "ENTER FREQUENCY IN GHz"; 70 INPUT Freq 80 IF Freq>Fmax OR Freq<Fmin THEN 90 DISP "FREQUENCY OUT OF RANGE - "; 100 GOTO 60 110 END IF 120 DISP "ENTER STEP SIZE IN GHz"; 130 INPUT Stepsize 140 IF Stepsize>Fmax-Fmin OR Stepsize<.000001 THEN 150 DISP "ILLEGAL STEP SIZE - "; 160 GOTO 120 170 END IF 180 OUTPUT Address;"CF1";Freq;"GH SYZ";Stepsize;"GH" 190 ON KEY 0 LABEL "STEP" GOTO 300 200 ON KEY 5 LABEL " UP " GOTO 300 210 ON KEY 1 LABEL "STEP" GOTO 320 220 ON KEY 6 LABEL "DOWN" GOTO 320 230 ON KEY 2 LABEL "NEW " GOTO 50 240 ON KEY 7 LABEL "FREQ" GOTO 50 250 GOTO 250 300 OUTPUT Address;"UP" 310 GOTO 250 320 OUTPUT Address;"DN" 330 GOTO 250 340 END 1010 SUB Iddev(Address,Model,Fmin,Fmax,Pmin,Pmax) 1020 DIM Ident$[36] 1030 OUTPUT Address;"OI" 1040 ENTER Address;Ident$ 1050 Model=VAL(Ident$[1,2]) 1060 Model Number=VAL(Ident$[3,4]) 1070 Fmin=VAL(Ident$[5,9]) 1080 Fmax=VAL(Ident$[10,14]) 1090 Pmin=VAL(Ident$[15,20]) 1100 Pmax=VAL(Ident$[21,24]) 1110 Model Prefix=Ident$[35,35] 1120 Series=VAL(Ident$[36]) 1130 SUBEND

Figure 2-21. Controlling CW Frequency/Parameter Entries

2-76 682XXB/683XXB PM

PROGRAMMING WITH PROGRAMMING 682XXB/683XXB GPIB COMMANDS EXAMPLES

The following program accepts user inputs for (1) power sweep starting and ending levels, (2) number of steps in the sweep, and (3) sweep dwell times. After accepting such imputs, the program then commands the signal generator to obtain a display of the power sweep.

NOTE: The signal ge ne rator should be connec te d to a scalar network analyzer.

30 Address=705 40 CALL Iddev(Address,Model,Fmin,Fmax,Pmin,Pmax) 60 DISP "ENTER POWER SWEEP STARTING LEVEL (dBm)"; 70 INPUT Powerstart 80 IF Powerstart>Pmax OR Powerstart<Pmin THEN

Program Explanation

Line 30:

generator.

Line 40:

subroutine described in line 1010.

Lines 60-110:

power level entry and checks its validity.

Lines 120-170:

power level entry and checks its validity.

Lines 180-230:

sweep number-of-s te ps entry and checks it validity.

Lines 240-290:

sweep dwell time entry and checks its validity.

Lines 300-310:

ator to perform th e ab ov e de fi ne d power sweep.

Line 340: Lines 1010-1120:

generator address, model, fr equency range, and power range.

Set the address of the signal Call the device identification

Accept the starting

Accept the endi ng

Accept the power

Sets the signal gener-

Ends the main program.

Identify the signal

90 DISP "POWER OUT OF RANGE - "; 100 GOTO 60 110 ENDIF 120 DISP "ENTER POWER SWEEP ENDING LEVEL (dBm)"; 130 INPUT Powerstop 140 IF Powerstop>Pmax OR Powerstop<Pmin THEN 150 DISP "POWER OUT OF RANGE - "; 160 GOTO 120 170 END IF 180 DISP "ENTER NUMBER OF STEPS"; 190 INPUT Noofsteps 200 IF Noofsteps<1 OR Noofsteps>10000 THEN 210 DISP "NUMBER OF STEPS OUT OF RANGE - "; 220 GOTO 180 230 END IF 240 DISP "ENTER DWELL TIME AT EACH STEP (mS)"; 250 INPUT Dwell 260 IF Dwell<1 OR Dwell>99000 THEN 270 DISP "DWELL TIME OUT OF RANGE - "; 280 GOTO 240 290 END IF 300 OUTPUT Address;"L1";Powerstart:"DM L2";Powerstop; "DM PNS";Noofsteps;"SPS" 310 OUTPUT Address;"PDT";Dwell;"MS LSP" 340 END 1010 SUB Iddev(Address,Model,Fmin,Fmax,Pmin,Pmax) 1020 DIM Ident$[36] 1030 OUTPUT Address;"OI" 1040 ENTER Address;Ident$ 1050 Model=VAL(Ident$[1,2]) 1060 Model Number=VAL(Ident$[3,4]) 1070 Fmin=VAL(Ident$[5,9]) 1080 Fmax=VAL(Ident$[10,14]) 1090 Pmin=VAL(Ident$[15,20]) 1100 Pmax=VAL(Ident$[21,24]) 1110 Model Prefix=Ident$[35,35] 1120 Series=VAL(Ident$[36]) 1130 SUBEND

Figure 2-22. Controlling Power Level and Power Sweep

682XXB/683XXB PM 2-77/2-78

Appendix A Index of GPIB Commands

A-1

INTRODUCTION

This appendix provides an alphabetical index of the G PIB Product Specific Commands for the 682XXB/683XXB. The index lists the command mnemonic code, a brief description of the command function, and the page number in Chapter 2 where a complete description of the command can be found.

GPIB Commands (1 of 15)

Command

Code

ACW Activates currently s canned freque ncy as CW 2-18

AD1 AD5 AD6

ADD Opens t he GPIB a ddres s param eter 2-71 ADP1 Opens the internal A M % depth pa rameter 2-11 ADP2 Opens the internal A M dB depth pa ramet er 2-11

ADR GPIB ad dress term inator 2-16

AF1 Sel ects F 1-F2 alter nate s weep 2-21 AF3 Sel ects F 3-F4 alter nate s weep 2-21

AFU Selects Full R ange a lternat e sweep 2-21

AL0 Set alternate sweep RF output level to L0 2-27 AL1 Set alternate sweep RF output level to L1 2-27 AL2 Set alternate sweep RF output level to L2 2-27 AL3 Set alternate sweep RF output level to L3 2-27 AL4 Set alternate sweep RF output level to L4 2-27 AL5 Set alternate sweep RF output level to L5 2-27 AL6 Set alternate sweep RF output level to L6 2-27 AL7 Set alternate sweep RF output level to L7 2-27 AL8 Set alternate sweep RF output level to L8 2-27

AL9 Set alternate sweep RF output level to L9 2-27 AM0 Turns off the i ntern al or ex ternal AM functio n 2-35 AM1 Turns on the external AM function in Linear mode 2-35 AM2 Turns on the external AM function in Log mode 2-35 AM3 Selects front panel external AM input 2-35 AM4 Selects rear panel external AM input 2-35

Selects F1-∆F alternate sweep Selects F5-∆F alternate sweep Selects F6-∆F alternate sweep

Function

Page

Number

2-21 2-21 2-21

682XXB/683XXB PM A-1

INDEX OF GPIB COMMANDS

GPIB Commands (2 of 15)

Command

Code

AM5 AM6 AM7 Turns on the internal AM function in Linear mode 2-35 AM8 Turns on the internal AM function in Log mode 2-35

AMI Turns on the AM M easu rem ent mode 2-41 AMR Opens the internal AM rate parameter 2-11 AMS Opens the external AM %/V sensitivity parameter 2-12

AMW(x)

ASD Opens the external AM dB/V sensitivity parameter 2-12

AT0 Deselects step attenu ator decoup le mode 2-29

AT1 Selects ste p attenuator decouple mode on 2-29

ATT(xx)

AUT Selects Auto sw eep tr igge r 2-21 BPN Selec ts –5V for retrac e and band switc h blanki ng outputs 2-54

BPP Selects +5V for retrace and bandswitch blanking outputs 2-54

CF0 Set CW mod e at F0, Opens F0 para meter 2-18

CF1 Set CW mod e at F1, Opens F1 para meter 2-18

CF2 Set CW mod e at F2, Opens F2 para meter 2-18

CF3 Set CW mod e at F3, Opens F3 para meter 2-18

CF4 Set CW mod e at F4, Opens F4 para meter 2-18

CF5 Set CW mod e at F5, Opens F5 para meter 2-18

CF6 Set CW mod e at F6, Opens F6 para meter 2-18

CF7 Set CW mod e at F7, Opens F7 para meter 2-18

CF8 Set CW mod e at F8, Opens F8 para meter 2-18

CF9 Set CW mod e at F9, Opens F9 para meter 2-18 CLO C loses the open paramete r 2-15

CLR Clears data entry 2-15 CM0 Set CW m ode at M0, Open s M0 p aramete r 2-18 CM1 Set CW m ode at M1, Open s M1 p aramete r 2-18 CM2 Set CW m ode at M2, Open s M2 p aramete r 2-18 CM3 Set CW m ode at M3, Open s M3 p aramete r 2-18 CM4 Set CW m ode at M4, Open s M4 p aramete r 2-18 CM5 Set CW m ode at M5, Open s M5 p aramete r 2-18 CM6 Set CW m ode at M6, Open s M6 p aramete r 2-18

Selects exte rnal AM input im pedanc e of 50Ω Selects exte rnal AM input im pedanc e of 600Ω

Selects the interna l AM wave form, wh ere x = 1-sine w ave, 2-square wave, 3-positive ramp, 4-negative ramp, 5-Gaussian noise , 6-unifor m noise, 7-tri angle wave

Sets step attenuator value to xx (×10 dB) in ALC step attenuator decouple mode. xx is an unsigned integer between 00 and 11.

Function

Page

Number

2-35 2-35

2-35

2-29

A-2 682XXB/683XXB PM

INDEX OF GPIB COMMANDS

GPIB Commands (3 of 15)

Command

Code

CM7 Set CW m ode at M7, Open s M7 p aramete r 2-18 CM8 Set CW m ode at M8, Open s M8 p aramete r 2-18 CM9 Set CW m ode at M9, Open s M9 p aramete r 2-18

CS0 Turns off the CW ramp 2-71 CS1 Turns on the CW ramp 2-71

CSB Clears all GPIB status bytes 2-52

D1 Opens the internal pulse delay1 parameter 2-13 D2 Opens the internal pulse delay2 parameter 2-13 D3 Opens the internal pulse delay3 parameter 2-13 D4 Opens the internal pulse delay4 parameter 2-13

DB dB data terminat or 2-1 6 DF0 DF1 DF5 DF6 DFF

DFM

DL1 Selects external detector leveling of the output power 2-28 DLF

DM dBm data terminator 2-16

DN Decrements the open parameter by the step size 2-15

DPT Internal triggere d pulse wit h delay 2-39

DS0

DS1

DU0 Deselects Dual Step s weep mode 2-21 DU1 Selects Dual S tep sw eep mo de on 2-21

DV Decibel/Volt (dB/V) terminator 2-16

EGI

EGO Outputs the value of th e Referenc e Level DAC 2-28

ELF Sel ects front pa nel exter nal leveli ng input 2-28 ELR Selects rear panel exte rnal leve ling input 2-28 EL0 Inhibits updating of the ESB2 bit 4 (RF Unlocked) 2-52 EL1 Enables updating of the ESB2 bit 4 (RF Unlocked) 2-52 EP0 Selec ts TTL- low to turn RF on du ring pul se modu lation 2-54 EP1 Selec ts TTL- high t o turn RF on du ring p ulse mo dulati on 2-54

Selects the F0-∆F sweep mode Selects the F1-∆F sweep mode Selects the F5-∆F sweep mode Selects the F6-∆F sweep mode Opens the ∆F parameter (Same as DLF) Opens the ∆F parameter (Same as DLF)

Opens the ∆F parameter

Turns on the secure mode (Blanks the front panel display of Frequency, Power Level, and Modu lation par ameters)

Turns off the secure mode and restores front panel display of all parame ters

Opens the Reference Level DAC setting parameter (in external power leveling mode)

Function

Page

Number

2-21 2-21 2-21 2-21 2-10 2-10

2-10

2-71

2-14

682XXB/683XXB PM A-3

INDEX OF GPIB COMMANDS

GPIB Commands (4 of 15)

Command

Code

ES0 Inhibits End-of-Sweep SRQ generation 2-51 ES1 Enables End-of-Sweep SRQ generation 2-51 EXT Selects sing le sw eep tri gger 2-21

F0 Opens the F0 para meter 2-10 F1 Opens the F1 para meter 2-10 F2 Opens the F2 para meter 2-10 F3 Opens the F3 para meter 2-10 F4 Opens the F4 para meter 2-10 F5 Opens the F5 para meter 2-10 F6 Opens the F6 para meter 2-10 F7 Opens the F7 para meter 2-10 F8 Opens the F8 para meter 2-10

F9 Opens the F9 para meter 2-10 FB0 Inhibits Extended Status Byte 1 SRQ generation 2-51 FB1 Enables Extended Status Byte 1 SRQ generation 2-51

FDV Opens the internal FM deviation parameter 2-12 FM0 Turns off the internal or ext ernal FM fu ncti on 2-35

FM1

FM2 FM3 Selects front panel external FM input 2-36

FM4 Selects rear panel external FM input 2-36 FM5 FM6

FM7 FM8 Turns on the int ernal FM f unct ion in Un lock ed W id e mo de 2-36

FM9 Turns on the internal FM func tion i n Lock ed m ode 2 -36

FMD Turns on the FM Measurement mode 2-41

FML Turns on the external FM func tion in Lock ed m ode 2- 37 FMN FMR Opens the inte rnal FM ra te parame ter 2-12

FMS Opens the external FM sensitivity parameter 2-12 FMU

FMW

Turns on the external FM function in Unlocked Narrow mode

Turns on the externa l FM function in Lock ed Low-Noise mode

Selects external FM input impedance of 50Ω Selects external FM input impedance of 600Ω Turns on the internal FM function in Unlocked Narrow

mode

Turns on the inter nal FM function i n Locked Low-Noise mode

Turns on the external FM function in Unlocked Narrow mode (Same as FM1)

Turns on the external FM function in Unlocked Wide mode

Function

Page

Number

2-36

2-36 2-36

2-36

2-37

2-36

A-4 682XXB/683XXB PM

INDEX OF GPIB COMMANDS

GPIB Commands (5 of 15)

Command

Code

FRS FUL Selects the Full Range sweep mode 2-21

FWV(x)

GH GHz data terminator 2-16 GP Internal gated pulse on 2-39

GTC

GTD

GTF

GTL

GTO Disables the GET functions 2-55

GTS

GTT

GTU

GV GHz p er volt (GHz/V ) data termin ator 2-16

HZ Hz data terminator 2-16

II0 Enables updating of the ESB2 b it 7 (Pa ramet er Cha nged) 2-52 II1 Inhibits updating of the ESB2 bit 7 (Parameter Changed) 2-52

IL1 Selects inte rnal leve ling of the ou tput powe r 2-27

IP Turns on internal pulse modulation 2-38

IM1 Turns on the Int ensity mark er mo de 2-25

KH kHz data term inator 2-16

KV kHz per vol t (kHz/V) da ta termin ator 2-16

L0 Sets RF output power level to L0 2-27 L1 Sets RF output power level to L1 2-27 L2 Sets RF output power level to L2 2-27 L3 Sets RF output power level to L3 2-27 L4 Sets RF output power level to L4 2-27 L5 Sets RF output power level to L5 2-27 L6 Sets RF output power level to L6 2-27 L7 Sets RF output power level to L7 2-27 L8 Sets RF output power level to L8 2-27

Opens the frequency scaling reference multiplier parameter

Selects the internal FM waveform, where x = 1-sine wave, 2-square wave, 3-positive ramp, 4-negative ramp, 5-Guassian noise, 6-unif orm n oise, 7-tria ngle wa ve

Scans to t he n ex t hi gh er pre se t CW f req ue nc y o n a GE T

(Executes a “SQF ” com mand) Steps the op en parameter down by the st ep size on a

GET (Executes a “DN” command) Executes a Fast-frequ ency-swi tching step on a GET (See

“ZL, ZEL” co mmands ) Steps to the next poin t in a dual step sweep mo de on a

GET (Executes a “TSS” command)

Triggers a single sweep on a GET (Executes a “TRS” command

Executes a c om pl et e si gnal g en er a tor s el f te st o n a GE T (Executes a “TST” command)

Steps the ope n para meter up by the s etp siz e on a GE T (Executes an “UP” command)

Function

Page

Number

2-54

2-37

2-55

2-56

682XXB/683XXB PM A-5

INDEX OF GPIB COMMANDS

GPIB Commands (6 of 15)

Command

Code

L9 Sets RF output power level to L9 2-27 LE0 Inhibits Lock Error SRQ generation 2-51 LE1 Enables Lock Error SRQ generation 2-51

LOS Opens the level offset param eter 2- 11 LO0 Turns off the Level Offset function 2-27 LO1 Turns on the Level Offset function 2-27

LS0 Inhibits updating of the ESB1 bit 3 (RF Locked) 2-52 LS1 Enables updating of the ESB1 bit 3 (RF Locked) 2-52

LSP Selects the Power Sweep mode 2-28 LUR

LUS

LU0 Turns off the activ e user leve l calibrati on table 2 -60 LU1 Activates user level calibration table #1 2-60 LU2 Activates user level calibration table #2 2-60 LU3 Activates user level calibration table #3 2-60 LU4 Activates user level calibration table #4 2-60 LU5 Activates user level calibration table #5 2-60 LV0 Turns off leveling of the output power 2-28

M0 Opens the M0 parameter 2-10 M1 Opens the M1 parameter 2-10 M2 Opens the M2 parameter 2-10 M3 Opens the M3 parameter 2-10 M4 Opens the M4 parameter 2-10 M5 Opens the M5 parameter 2-10 M6 Opens the M6 parameter 2-10 M7 Opens the M7 parameter 2-10 M8 Opens the M8 parameter 2-10

M9 Opens the M9 parameter 2-10 MAN Selects manual (s tep) sweep 2-21 MB0 Sets the enable mask byte for the Primary Status Byte 2-51 MB1 Sets the enable mask byte for Extended Status Byte 1 2-51 MB2 Sets the enable mask byte for Extended Status Byte 2 2-51 ME0 Disables the marker at the active frequency 2-25 ME1 En ables a marke r at the acti ve frequenc y 2-25

MH MHz data t ermin ator 2-16

MK0 Turns off markers 2-25

Readies the 682XXB/683XXB to receive five tables of user level calib ration data f rom t he con troller.

Sends all fi ve tables of us er level cali bration data to the controller.

Function

Page

Number

2-60

A-6 682XXB/683XXB PM

INDEX OF GPIB COMMANDS

GPIB Commands (7 of 15)

Command

Code

MOM Turns off the AM and F M measur ement modes 2-41

MS Millis econds (ms) data t ermin ator 2-16 MV MHz per volt (MHz/V) data terminator 2-16

NS Nanoseconds (ns) data t erminat or 2-16

OAB

OAD1

OAD2

OAE

OAI OAR Returns the in terna l AM rat e (in Hz ) to th e contro ller 2-44 OAS

OAW

OD1

OD2

OD3

OD4

ODD

ODE ODF ODL

ODP

ODS

OEM OES Return s all three GPI B status by tes to the con troller 2-46

OF0 Returns the F0 frequency value (in MH z) to the contr oller 2-42

Returns the exte rna l AM sens itiv ity va lue (in dB/V) to the controller

Returns the i nternal AM dep th valu e (in %) to the controller

Returns the i nternal AM dep th valu e (in dB ) to the controller

Returns the name of the AM source ("FRONT", "REAR", "INTERNAL") to the controller

Returns the exte rnal AM impedance valu e (in Ω) to the controller

Returns the exte rnal AM sens itivity value (i n %/V) to the controller

Returns the name of the internal AM waveform ("SINE", "SQUARE WAVE", "RAMP UP", "RAMP DOWN", "GAUSSIAN NOISE", "UNIFORM NOISE", "TRIANGLE") to the controller

Returns the internal pulse delay1 value (in µs) to the controller

Returns the internal pulse delay2 value (in µs) to the controller

Returns the internal pulse delay3 value (in µs) to the controller

Returns the internal pulse delay4 value (in µs) to the controller

Returns the inte rnal pul se steppe d delay mo de step size value (in µs) to the co ntrolle r Returns the inte rnal pulse stepped delay mode delay 1 stop value (i n µs) to the controller

Returns the ∆F frequency value (in MHz) to the controller Returns the internal pulse stepped delay mode dwell-

time-per-step value (in ms) to the controller Returns the internal pulse delay1 value (in µs) to the

controller (Same as OD1) Returns the inte rnal pulse stepped delay mode delay 1 start value (i n µs) to the controller Returns the Extended SRQ Mask bytes (3 binary bytes)

to the controller

Function

Page

Number

2-44

2-43

2-44

2-45

2-45 2-43 2-45

2-45

2-46

682XXB/683XXB PM A-7

Anritsu 68247B GPIB Programming Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

Table of Contents