HP 8642a, 8642b schematic

Errata

Title & Document Type: 8642A/B Synthesized Signal Generator Operation and Calibration Manual

Manual Part Number: 08642-90224

Revision Date: 1996-03-01

HP References in this Manual

This manual may contain references to HP or Hewlett-Packard. Please note that HewlettPackard's former test and measurement, semiconductor products and chemical analysis businesses are now part of Agilent Technologies. We have made no changes to this manual copy. The HP XXXX referred to in this document is now the Agilent XXXX. For example, model number HP8648A is now model number Agilent 8648A.

About this Manual

We’ve added this manual to the Agilent website in an effort to help you support your product. This manual provides the best information we could find. It may be incomplete or contain dated information, and the scan quality may not be ideal. If we find a better copy in the future, we will add it to the Agilent website.

Support for Your Product

Agilent no longer sells or supports this product. You will find any other available product information on the Agilent Test & Measurement website:

www.tm.agilent.com

Search for the model number of this product, and the resulting product page will guide you to any available information. Our service centers may be able to perform calibration if no repair parts are needed, but no other support from Agilent is available.

Errata

Title & Document Type: 8642A/B Synthesized Signal Generator Operation

and Calibration Manual

Manual Part Number: 08642-90224

Revision Date: 1996-03-01

HP References in this Manual

About this Manual

Support for Your Product

Agilent no longer sells or supports this product. You will find any other available product information on the Agilent Test & Measurement website:

www.tm.agilent.com

HP 8642A/B

SYNTHESIZED SIGNAL GENERATOR

(Including Options

001,

002, and 003)

Operation and Calibration Manual

SERIAL NUMBERS

This manual applies directly to instruments with

serial numbers prefixed:

2427A to 2930A and all major changes that apply to your instrument/modules.

For additional important information about serial numbers, refer to "INSTRUMENTS COVERED BY THIS MANUAL" in Section 1.

Third Edition

This material may be reproduced by or for the U.S.

Government pursuant to the Copyright License under the clause at DFARS 52.277-7013 (APR. 1988).

EAST 24001 MISSION AVENUE, TAF C-34, SPOKANE, WASHINGTON,

U.S.A.

99220

Operation and Calibration Manual HP Part 08642-90224 Other Documents Available:

Microfiche Operation and Calibration Manual HP Part 08642-90225 Service Manual (Volume 1, 2, 3) HP Part 08642-90226

Microfiche Service Manual HP Part 08642-90227

Printed in

U.S.A.:

HEWLETT

PACKARD

March 1996

Model 8642A/B

Safety Considerations

SAFETY CONSIDERATIONS

GENERAL

This product and related documentation must be reviewed for familiarization with safety markings and instructions before operation.

This product is a Safety Class I instrument (provided with a protective earth terminal).

BEFORE APPLYING POWER

Verify that the product is set to match the available

line voltage and the correct fuse is installed.

SAFETY EARTH GROUND

An uninterruptible safety earth ground must be provided from the main power source to the product input wiring terminals, power cord, or supplied power cord

set.

SAFETY SYMBOLS

Instruction manual symbol: the product will

be marked with this symbol when it is necessary for the user to refer to the instruction manual (refer to Table of Contents).

Lj Indicates hazardous voltages.

WARNING

Any interruption of the protective (ground-

ing) conductor (inside or outside the instrument) or disconnecting the protective earth terminal will cause a potential shock hazard that could result in personal injury. (Grounding one conductor of a two conductor outlet is not sufficient protection).

Whenever it is likely that the protection has been impaired, the instrument must be made inoperative and be secured against any unintended operation.

If this instrument is to be energized via an

autotransformer (for voltage reduction) make sure the common terminal is connected to the earth terminal of the power source.

Servicing instructions are for use by servicetrained personnel only. To avoid dangerous electric shock, do not perform any servicing unless qualified to do so.

"=r Indicates earth (ground) terminal.

WARNING

procedure, practice, or the like, which, if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met.

CAUTION

operating procedure, practice, or the like, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met.

The WARNING sign denotes a hazard. It calls attention to a

]

The CAUTION sign denotes a hazard. It calls attention to an

Adjustments described in the manual are per-

formed with power supplied to the instrument

while protective covers are removed. Energy available at many points may, if contacted, result in personal injury.

Capacitors inside the instrument may still be charged even if the instrument has been disconnected from its source of supply.

For continued protection against fire

replace the line fuse(s) only with 250V fuse(s)

of the same current rating and type (for exam-

ple, normal blow, time delay,

repaired fuses or short circuited fuseholders.

etc.).

hazard,

Do not use

CERTIFICATION

Hewlett-Packard Company certifies that this product met its published specifications at the time of shipment from the factory. Hewlett-Packard further certifies that its States National Bureau of Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities of other International Standards Organization members.

calibration

measurements are

traceable

to the United

WARRANTY

This Hewlett-Packard instrument product is warranted against defects in material and workmanship for a period

of one year from date of shipment. During the warranty period, Hewlett-Packard Company will at its option, either repair or replace products which prove to be defective.

For warranty service or repair, this product must be returned to a service facility designated by HP. Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to HP from another country.

HP warrants that its software and firmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument. HP does not warrant that the operation of the instrument, or software, or firmware will be uninterrupted or error free.

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modification or specifications for the product, or improper site preparation or maintenance.

misuse,

operation outside of the environmental

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES

THE REMEDIES PROVIDED HEREIN ARE BUYER'S SOLE AND EXCLUSIVE REMEDIES. HP SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

ASSISTANCE

Product maintenance agreements and other customer assistance agreements are available for Hewlett-Packard products.

For any assistance, contact your nearest Hewlett-Packard Sales and Service Office. Addresses are provided at

the back of this manual.

Model 8642A/B Contents

CONTENTS

SECTION 1

GENERAL INFORMATION

Introduction to the Operating and Service Manual 1-1

Volume I, Operating Manual 1-1

Volumes II through IV, Service Manual 1-1 Where to Find Instrument Specifications 1-1 Where to Find Safety Considerations 1-2 Hewlett-Packard Interface Bus (HP-IB) Enables 1-2

Remote Control of the Instrument 1-2

Selectingthe HP-IB Address 1-2

HP-IB Capabilities 1-2 An Explanation of On-Site Service Strategy 1-3

Hardware Features 1-3

Built-in Test Features 1-3

Firmware Features 1-3 How the Operating Fundamentals Can Help You Learn to Operate the Instrument 1-3 Accessories Supplied With the 8642A/B 1-4

Options Available With the Instrument 1—4

Electrical Options 1-4

Mechanical Options 1-4 Documentation Options 1-5

Equipment That Can Be Ordered For the Signal 1-5

Generator 1-5 On-Site Service Eats 1-5 Bench Service Kits 1-5 Signal Generator Test System, HP 8902SG 1-5 50Q to 75ft Adapter 1-5 Fiberglass Transit Case 1-5

Rack-Slide Kit 1-5 How to Use the Recommended Test Equipment Table 1-6 Instruments Covered By This Manual 1-6 Table 1-1, Specifications 1-7 Table 1-2, Supplemental Characteristics 1-13 Table 1-3, Recommended Test Equipment 1-15 Figure 1-1, 1 MHz Low Pass Filter 1-16 Table 1-4, Alternative Test Equipment 1-16 Table 1-5, HP 11801C On-Site Service Kit 1-17

rcv.l5NOV90 v

Contents

Model 8642A/B

SECTION

INSTALLATION

Introduction Initial Inspection Preparation

Power Requirements Power Cables HP-IB Address Selection Interconnections Mating Connectors Operating Environment Rack Mounting

Storage

Environment Packaging

Figure 2-2, HP-IB Connections

Introduction to Section 3 Detailed Operating Instructions

Figure 3-1, Basic Functions

Figure HP-IB Table HP-TB Remote Operation HP-IB Address

HP-IB Capabilities Data Input Data Output Clear

3-24 Remote, Local Local Lockout, Service Request Status Byte

Additional HP-IB Information HP-IB Codes Summary HP-IB Related Front-Panel Keys HP-IB Related Terms RF Frequency

RF Frequency Contents

RF Frequency

Relative RF Frequency

RF Frequency Sweep

Amplitude

Relative Amplitude

2-1

For

Use

2-1

2-3

2-5

and

Shipment

2-6

2-7

SECTION

OPERATION

3-1

3-2

3-2,

Rear-Panel Features

Contents

3-5

3-4

3-7

3-8

3-9

3-11

3-15

3-25

Set

Local

3-26

3-27

3-29

3-31

3-32

3-34

3-35

3-37

3-39

3-45

3-49

3-67

Amplitude Contents

3-67

3-69

3-77

Amplitude Sweep

3-83

3-3

vi rrr. 1:'K\()V'.)()

Model 8642A/B Contents

Modulation 3-95

Modulation Contents 3-95 Modulation, AM 3-97 Modulation, FM 3-105 Modulation, $M 3-119 Modulation, Pulse 3-127 Modulation, Oscillator 3-131

Setting Modifications 3-135

Setting Modifications Contents 3-135 Instrument Preset, Partial Preset 3-137 Knob 3-141 Step,

Increment Set 3-149

Entry Off 3-153

Recall Registers 3-155

Recall Registers Contents 3-155

Save/Recall 3-157 Sequence 3-161

Special Functions 3-165

Special Functions Contents 3-165 Special Functions 3-167

Messages 3-177

Messages Contents 3-177 Operating Messages 3-179

Apendixes 3-199

Apendix Apendix Apendix C: Amplitude Units Conversion Apendix Appendix E: Individual Instrument Identification

Glossary 3-199

Writing Messages to the Display 3-201

3-205

Display Annunciators and Abbreviations

3-207

3-208.1

SECTION 4

PERFORMANCE TESTS

Introduction 4-1 Recommended Test Equipment 4-1 Abbreviated Performance Testing 4-1 Level Accuracy and Flatness Tests 4-3 Harmonics Tests 4-9 Pulse On/OffRatio Test 4-11 Residuals Tests 4-13

AM, FM, and SMTests 4-15 Extended FM Distortion Test 4-22 Internal Modulation Oscillator Tests 4-24 SWR 4-27 Spurious Test 4-31 Third Order Intermodulation 4-33 SSB Phase Noise Test 4-35 SSB Phase Noise Test (Optional) 4-38 Extended Pulse Tests 4-41

Optional Residual FM Test 4-43 Internal Time Base Aging Rate Test 4-45

Test Record 4-49

rcv.l»NOV90 vii

Contents

SECTION 5

ADJUSTMENTS

Model 8642A/B

Adjustments 5-2 Auto-Adjust Routines 5-2

Description 5-2 How All Auto-Adjust Procedures Begin 5-3

Correction Data Special Functions 5-5

Identifying the Contents of A20 5-5 Identifying the Contents of

5-7

Interpreting Cal Data Stats 5-8

viii rn:l').\:OV90

Model 8642A/B

Section 1

GENERAL INFORMATION

1-1.

INTRODUCTION TO THE OPERATING AND SERVICE MANUAL

This manual contains information required for a qualified person to install, operate, test, adjust, and service the Hewlett-Packard Model 8642A/B Signal Generator. The HP 8642A/B will generally be referred to as the Signal Generator throughout the manual. The Operating and Service Manual is comprised of four volumes as described below.

Volume 1, Operation and Calibration Manual

Product Note 8642A/B-1. This Product Note explores the HP 8642A/B features by discussing their

benefits for your application.

Section 1, General Information. General Information covers instrument specifications, options, equipment available, recommended test equipment, and an explanation of the On-Site Service Strategy for the HP 8642A/B.

General Information

Section 2, Installation. Installation covers initial inspection, preparation for use, and storage and shipment.

Section 3, Operation. Operation provides HP-IB operating information (including HP-IB address selection) and detailed operating information for either the beginning or experienced user. A glossary and index are provided at the end of Section 3.

Section 4, Performance Tests. Performance Tests enable you to check the performance of the

instrument against the specifications listed in Table 1-1.

Section 5, Adjustments. The adjustment procedures that are normally found in this section are now located in Section 8 with the appropriate troubleshooting procedures and schematics.

Volumes 2 through 5, Service Manual

Section 6, Replaceable Parts. Replaceable Parts lists all replaceable parts and assemblies.

Section 7, Instrument Changes. Instrument changes provide backdating information, and retrofitting

and modification information.

Section 8, Service. Service provides the information required to adjust and repair the instrument.

1-2. WHERE TO FIND INSTRUMENT SPECIFICATIONS

Instrument specifications are listed in Table 1-1. These specifications are the performance standards or limits against which the instrument can be tested. Supplemental characteristics are listed in Table 1-2. Supplemental characteristics are not guaranteed specifications but are typical characteristics included as additional information.

rev.30SEP88

1-1

General Information

Model 8642A/B

1-3. WHERE TO FIND SAFETY CONSIDERATIONS

This product is a Safety Class I instrument; that is, one provided with a protective earth terminal. Before operating or servicing the Signal Generator, service personnel should familiarize themselves with the safety markings on the Signal Generator and the safety instructions. Safety information pertinent to the task at hand (that is, information regarding installing, operating, performance testing, adjusting, or servicing the HP 8642A/B) is found throughout this manual. Refer to the Safety Considerations pages found at the beginning of Volume 1 for a summary of that information.

1-4. HEWLETT-PACKARD INTERFACE BUS (HP-IB) ENABLES REMOTE CONTROL OF

THE INSTRUMENT <Z2H>

The HP 8642A/B Signal Generator has a Hewlett-Packard Interface Bus (HP-IB) interface and can be used with an HP-IB compatible controller for test system applications. The Signal Generator is fully programmable via the Hewlett-Packard Interface Bus. HP-IB is Hewlett-Packard's implementation of

IEEE Standard 488 and the identical ANSI Standard MCl.l. (Refer to the HP-IB portion of Section 3

for more complete details.)

Selecting the HP-IB Address

The Signal Generator's HP-IB address is set to 19 at the factory in both internal memory and an internal switch located inside the instrument. The decimal equivalent of the

be displayed on and changed from the front panel. Refer to HP-IB Address in the HP-IB portion of

Section 3 for information regarding changing the HP-IB address.

5-bit

address code can

HP-IB Capabilities

This Signal Generator's HP-IB capabilities are defined by the following list of interface functions. For more information, refer to HP-IB Capabilities in Section 3.

Source Handshake Acceptor Handshake Talker Extended Talker Listener Extended Listener Service Request Remote Local Parallel Poll Device Clear Device Trigger Controller

Driver Electronics

SHI AH1 T6 TEO L3 LEO SRI RL1 PPO DC1 DTO Cl C2 C3 C28 E2

(Complete capability) (Complete capability) (No talk only mode) (No capability) (Complete capability including Listen Only) (No capability) (Complete capability) (Complete capability) (No capability)

(Complete capability) (No capability) (System controller) (Send IFC and take charge) (Send REN) (Send interface messages) (Three-state drivers)

1-2 rev.30SEP88

Model 8642A/B

1-6. AN EXPLANATION OF THE ON-SITE SERVICE STRATEGY

The objectives of the on-site service strategy are to provide the equipment and information necessary to enable service-trained personnel to troubleshoot and repair the HP 8642A/B to the module level at

its operating site. Using the On-Site Service Kit (refer to paragraph 1-12 for a description), a service person should be able to successfully repair 80more of Signal Generator failures within two hours after arriving at the operating site. Repair times may be longer for individuals with no prior training or experience on the HP 8642A/B.

The following service features have been designed into the HP 8642A/B:

Hardware Features

• Each major circuit function is physically located in a separate module.

• RF modules are arranged physically from left to right in the order of their functional sequence.

• Most intermodule connections are accessible from the top of the instrument.

• There are no RF feedback paths between modules (a feed-forward design).

• Printed on the inside top cover of the instrument is an illustrated top view of the inside of the instrument as well as a table of cable connections.

Built-in Test Features

• A voltmeter and a power meter are built into the instrument.

• Unique service tools are stored inside the HP 8642A/B cabinet.

General Information

Firmware Features

• All RF modules are connected to a diagnostic bus which allows the controller to monitor critical operating test points within the module.

• Critical message information concerning the operating condition of the HP 8642A/B is displayed in numeric code on the front panel (or can be printed via an HP-IB printer without the need of an external controller).

• Four instrument diagnostic levels help to analyze the instrument's condition: Power-Up Check, Fault Detection Self-Check, Instrument Level Diagnostics, and Module Level Diagnostics.

1-7. HOW THE OPERATING FUNDAMENTALS CAN HELP YOU LEARN TO OPERATE

The Operating Fundamentals are abbreviated, front-panel operating instructions (included with Volume 1 as a separate booklet) which will enable you to operate the basic functions of the Signal Generator without using the more detailed and extensive portions of the Operating Manual. However, the Detailed Operating Instructions in Section 3 can provide more specific information, which can be easily accessed with an Index.

Self-

rev.30SEP88 1-3

General Information

1-8. ACCESSORIES SUPPLIED WITH THE 8642A/B

The line power cable is the only accessory supplied with the Signal Generator. The line power cable is selected at the factory according to the line power requirements specified by the customer. If the line power cord type is not specified, it will be selected according to the voltage available in the country of destination. For the part numbers of the power cables, refer to Table 2-1 on page 2-4, Power Cable and Mains Plug Part Numbers. Signal Generators shipped to countries using 115 volts are also supplied with a set of fuses for 230 volt operation.

1-9. OPTIONS AVAILABLE WITH THE INSTRUMENT

Electrical Options

Electrical option numbers can be displayed on the front panel or read via HP-IB. Refer to page 3-208.1 for more information.

Option 001 (High Stability Time Base). This optional time base improves the frequency accuracy and stability of the internal reference oscillator. (Refer to Table 1-1 for specifications.)

Option 002 (Rear-Panel Output for All Connectors). This option places all front-panel connections

on the rear panel of the instrument.

Model 8642A/B

HP 8642A Option 003 (Increased Output Power Option). This option enables the HP 8642A

Synthesized Signal Generator to deliver the same output power as the HP 8642B (excluding band 10).

Mechanical Options

Option 907 (Front-Handle Kit). Front handles are provided when Option 907 is ordered. Order a Front-Handle Kit as HP part number 5061-0089.

Option 908 (Rack-Flange Kit). Rack flanges are provided for the Signal Generator when Option 908 is ordered. (When rack mounting the Signal Generator, ensure the instrument is supported properly by using the system cabinet's support rails. Due to the weight of the HP 8642A/B, not using the support rails could cause damage to the instrument and/or the system cabinet.) Order a Rack-Flange Kit as HP part number 5061-0077.

Option 909 (Rack-Flange and Front-Handle Combination Kit). This is not a Front-Handle Kit and a Rack-Flange Kit packaged together; it is a unique part that combines both functions. Combination kits are provided for the Signal Generator when Option 909 is ordered. (When rack mounting the Signal Generator, ensure the instrument is supported properly by using the system cabinet's support rails.

Due to the weight of the HP 8642A/B, not using the support rails could cause damage to the instrument and/or the system cabinet.) Order a Rack-Flange and Front-Handle Combination Kit as HP part number 5061-0083.

Rack-Slide Kit information is listed on the following page under paragraph 1-10, Equipment That Can Be Ordered for the Signal Generator. If you are planning to take advantage of the On-Site Service Strategy for the HP 8642A/B, we suggest you use the Rack-Slide Kit when rack mounting the instrument.

1-4

rev.30SEP88

Model 8642A/B General Information

Documentation Options

Option 910 (Extra Manual). This option provides an additional Operating and Service Manual (Volumes I through IV). Order the additional manual as HP part number 08642-90012.

Option 710 (On-Site Service Manual). The On-Site Service Manual is a service tool directed at speedy

troubleshooting and repair of the HP 8642A/B to the module level. The manual provides a systematic approach to troubleshooting which directs the technician through instrument checks, module-group checks, and then specific module checks. The On-Site Service Manual is designed for use with the

On-Site Service Kits. (Refer to paragraph 1-10 below.) Order the On-Site Service Manual as HP part number 08642-90020. (It is not necessary to order option 710 if an On-Site Service Kit is ordered.)

1-10. EQUIPMENT THAT CAN BE ORDERED FOR THE SIGNAL GENERATOR

On-Site Service Kits

Each of these kits contains an On-Site Service Manual in addition to all HP 8642A/B modules and interconnecting cables required for on-site, module-level repair. Each kit also includes a set of tools (not normally found in a standard tool box) necessary to service the HP 8642A/B. Order the HP 11801A to service the HP 8642A. Order the HP 11801B to service the HP 8642B. Order the HP 11801C to service both instruments. Refer to Table 1-5, on page 1-17, for a complete parts listing of the On-Site Service Kit. (Although two part numbers are listed for modules in the On-Site Service Kit, only the new or the restored module will be included in the kit.)

Bench Service Kit

This kit, in conjunction with the HP 8642A/B Service Manual, is directed at component-level repair and module calibration of the HP 8642A/B. The kit contains special tools and troubleshooting aids such as a Torx torque wrench and Torx bits, test adapters, and special cables and cable adapters, etc.

Order the Bench Service Kit as HP part number 11802A. Refer to Figure 1-2 on page 1-19 for a

complete parts listing of the Bench Service Kit.

Signal Generator Test System, HP 8902SG, including HP 11808A software

This test system provides the necessary equipment for automated performance testing of the HP 8642A/B.

50 Ohm to 75 Ohm Adapter

This adapter is an impedance-matching network required for testing with 75 ohm cabling and/or loads. Order the adapter with HP part number 11687A.

Fiberglass Transit Case

Order this protective case for shipping and transporting the HP 8642A/B Signal Generator as HP part number 9211-2661.

Rack-Slide Kit

This heavy-duty, rack-slide kit is the kit recommended for the HP 8642A/B Signal Generator. Order the Rack-Slide Kit for instrument cabinet frames assembled with metric hardware as HP part number 08642-80059. Order the Rack-Slide Kit for instrument cabinet frames assembled with English hardware as HP part number 08642-80058. (Note that if metric hardware is used, the rear panel of the instrument mentions that fact.)

rev.30SEP88

1-5

General Information

1-11.

HOW TO USE THE RECOMMENDED TEST EQUIPMENT TABLE

Table 1-3 lists the test equipment required for testing, adjusting, and servicing the Signal Generator. The critical specification column describes the essential requirements for each piece of test equipment. Other equipment can be substituted if it meets or exceeds these critical specifications.

Alternate models are suggested in Table 1-4. Some reasons for recommending an alternate model might be its HP-IB compatibility or its ability to replace two or more single models.

1-12. INSTRUMENTS COVERED BY THIS MANUAL

Serial Numbers.

Attached to the instrument is a serial-number plate. The serial number is in the form: 0000A00000. The first four digits and the letter are the serial prefix. The last five digits form the suffix that is unique to each instrument. The contents of this manual apply directly to instruments having the same serial prefix(es) as those listed at the beginning of Volume 1.

Manual Updates.

An instrument manufactured after the printing of this manual may have a serial prefix that is not listed at the beginning of Volume 1. An unlisted serial prefix number indicates that the instrument differs in some way from those documented in this manual.

Model 8642A/B

A "MANUAL UPDATES" packet is shipped with the manual when necessary to provide you with the most current information available at the time of shipment. These packets consist of replacement and addition pages which should be incorporated into the manual to bring it up to date.

Hewlett-Packard offers a Documentation Update Service that will provide you with further updates as they become available.

If you operate or service instruments of different serial prefixes, we strongly recommend that you join this service immediately to ensure that your manual is kept current. For more information refer to the Documentation Update Service reply card included with this manual or contact:

Hewlett-Packard Company Spokane Division Technical Writing Department 24001 E. Mission - TAF C-34 Spokane, WA 99220

(509) 922-4001

1-6

rev.30SEP88

Model 8642A/B

General Information

Table 1-1. Specifications

Electrical Characteristic Performance Limits

FREQUENCY

Range

HP8642A HP 8642B

Carrier Frequency

Band

10 (8642B only)

9 8 7

6 5 4 3 2

HET

Resolution

100 kHz to 1057.5 MHz 100 kHz to 2115 MHz

1057.500001-2115.000000 MHz

528.750001-1057.500000 MHz

264.375001-

132.187501-

66.093751-

33.046876- 66.093750 MHz

16.523438- 33.046875 MHz

8.261717- 16.523427 MHz

4.130860- 8.261718 MHz

0.100000- 4.130859 MHz

0.100000- 132.187500 MHz

1 Hz (0.1 Hz with Special Function 240

or 241)

528.750000 MHz

264.375000 MHz

132.187500 MHz

of 6)

Conditions

Stability

INTERNAL REFERENCE OSCILLATOR

Standard Option 001 Aging Rate

SPECTRAL PURITY

SSB Phase Noise

Band

9 8 7

6 5 4

HET

Same as reference oscillator

See Supplemental Characteristics

<l0~9/day

SSB Phase

Noise, 20 kHz offset from carrier

-125 dBc/Hz

-134dBc/Hz

-137 dBc/Hz

-141 dBc/Hz

-144 dBc/Hz

-145 dBc/Hz

-146 dBc/Hz

-147 dBc/Hz

-148 dBc/Hz

-134 dBc/Hz

-125 dBc/Hz

SSB Phase Noise Floor, 200 kHz offset from carrier

-134 dBc/Hz

-143 dBc/Hz

-144 dBc/Hz

-145 dBc/Hz

-147 dBc/Hz

-148 dBc/Hz

-149 dBc/Hz

-135 dBc/Hz

-137 dBc/Hz

After 8-day warm-up

CW, AM, or Angle Modulation

<1/60 Maximum Peak Deviation

Both generators cover their ranges in one continuous span. However, many other specifications are dependent on carrier

frequency. To simplify such specifications, the 8642A and 8542B carrier frequency ranges are divided into bands.

Band 9, 8642B carrier frequency ranges is 528.7500005 MHz to 1057.500000 MHz.

rei:.10JAN91

General Information

Model 8642A/B

Electrical Characteristic

SPECTRAL PURITY (Cont'd)

Residual FM

Band

10 (8642B only)

9 8

1-7

HET

Residual AM

Spurious Output Signal

Harmonics

Sub-harmonics Non-harmonics

OUTPUT

Level Range

Maximum Level Available

Table 1-2. Specifications

Performance Limits Conditions

Post Detection Bandwidth

0.3 to 3.0 kHz <5 Hz rms <2 Hz rms <1.2 Hz rms <1 Hz rms <3.5 Hz rms

<0.01%

8642A/B, Bands 1-9, HET

-30dBc

-20 dBc none

-100 dBc

From Maximum Level Available to

-140 dBm (0.023 /j.V into 50 ohms)

+20 dBm (2.24V) +19 dBm(2.00V) +18dBm(1.78V) +17 dBm (1.59V) +16 dBm (1.41V)

0.05 to 15.00 kHz

AM rms

8642B,

Band 10

of 6)

<9 Hz rms <5 Hz rms <2 Hz rms <1.2 Hz rms <5 Hz rms

-25 dBc

-20 dBc

-45 dBc

-94 dBc

CW.AM or Angle Modulation < V3 Maximum Peak Deviation

0.3 to 3.0 kHz Post Detection Bandwidth

Output level < +10 dBm

Output level < +16 dBm

>10 kHz from the carrier

8642A (except

Opt. 003)

bands 1 thru 7 DNA band 8, HET n/a band 9

8642B and

8642A Opt.003

bands 1 thru 7 band 8 HET band 9 band10(8642B)

Resolution

Absolute Level Accuracy

Flatness Impedance SWR

Reverse Power Protection

Third Order Intermodulation

Available Calibration Units

Not specified in HET band.

Absolute output accuracy consists of allowances for detector linearity, temperature, flatness, and attenuator accuracy.

0.1 dB ±1 dB < ±0.75 dB 50 ohms nominal

<1.5:1

<2.0:1 50W, 25 VdC, 8642A 25W, 50 VdC, 8642B

< -50 dBc at + 10 dBm. Typically

decreases 10 dB for every 5 dB

of combined level decrease

dmb,

V, mV, pV, dB^V, EMF V, EMF mV, EMF /zV, dB EMF /iV. REL ZERO or REF SET can be used to obtain settings such as

dbV or dBf.

Output levels > -127 dBm Output level, +10 dBm

Output levels <0 dBm

Two signal generators

spaced 25 kHz apart into a

resistive combiner

1-8

with

frequencies

rev.l8MAR91

Model 8642A/B

General Information

Table 1-1. Specifications (part of 3 of 6)

Electrical Characteristics

AMPLITUDE MODULATION

Depth Resolution Indicator Accuracy

(1 kHz rate, up to 90% AM)

AM Distortion at 1 kHz Rate

AM 3 dB Bandwidth

(Depth <90%)

Incidental *M

(1 kHz rate and 30% AM)

AM bandwidth is increased to 100 kHz in these bands by using Special Function 8 (prefer HET band).

0% to 99.9%

0.1% ±(3.5%

±(5%

8642A Bands 1-8, HET;

8642B Bands 1-9

8642A Band 9, HET; 8642B Band 10, HET

dc to 100 kHz 20 Hz to 100 kHz

dc to 20 kHz 20 Hz to 20 kHz

<0.2 radians peak

Performance Limits

of setting +1% AM)

<1% <2% <4%

<2% <4% <6%

Conditions

Output level <+10 dBm

8642A Bands 1-8, HET; 8642B Bands 1-9, HET

8642A Band 9, 8642B Band 10

0% to 30% AM 30%

to 70% AM

70%

to 90% AM

0% to 30% AM 30%

to 70% AM

70%

to 90% AM

External dc, bands 1, 5 thru External ac and internal,

bands 1, 5 thru 10 External dc, bands5 2, 3, 4 External ac and internal,

bands5 2, 3, 4

rev.07JUNE85

1-8.1

Model 8642A/B General Information

Table

1-1.

Specifications (part

of 3 of 6)

Electrical Characteristics

FREQUENCY MODULATION

Maximum

Deviation

Band

10 (8642B only)

9 8 7 6 5 4 3 2

HET

10 (8642B only)

9 8 7 6 5 4 3

2 1

HET

Resolution

Indicator Accuracy

(Rates

20 Hz to 100 kHz)

FM Distortion

(Rates

20 Hz to 100 kHz)

3 dB

Bandwidth

Performance Limits

MHz

1.5

MHz

750

kHz

375

kHz

187.5 kHz

93.75 kHz

46.875 kHz

23.437 kHz

11.718 kHz

93.75 kHz

1.5

MHz

(the smaller 3

MHz or f

1.5

MHz or f 750 375

187.5

93.75

46.875

23.437

11.718

93.75

1.5

MHz or f

0.7%

6 6

kHz or f kHz or f

kHz or f kHz or f kHz or f

kHz or f

setting

6 6 6

of:)

X 2160

mod

X 1080

mod

X 540

mod

X 270

mod

mod mod

mod mod mod

mod

X 1080

mod

X 135 X

67.5

33.75

16.875

8.4375

67.5

0.0004% maximum deviation, whichever larger

±(5%

setting

+10 Hz)

0.4% dc

200

kHz

Hz to

200

kHz

Hz to 100 kHz

Conditions

External

6 6

coupled

internal

For maximum dc-coupled deviation For

1/2 max

For

1/15 max

External External

dc-coupled deviation

source

Internal source

Maximum deviation may

than

the

values shown here.

rev.07JUNE85

increased up

HET

band

to tha

can als

shown

for

the HET band (0.1 MHz

selected with Special Function

132.1875

Hz carrier frequency)

selecting deviation larger

1-9

General Information

Table 1-1. Specifications (4 of 6)

Electrical Characteristics

FREQUENCY MODULATION (Cont'd)

Incidental AM

Carrier Frequency Offset

When Entering FM or

PM Modes

PHASE MODULATION

Maximum Phase Deviation

Band

10 (8642B only)

9 8 7 6 5 4 3 2

HET

Resolution

Indicator Accuracy $M Distortion $M 3 dB Bandwidth

PULSE MODULATION

Pulse On/Off Ratio

Rise/Fall Time Maximum Repetition Frequency Minimum Pulse Width Nominal Input Threshold Level

INTERNAL MODULATION OSCILLATOR

Frequency Range Frequency Resolution Frequency Accuracy Output Level Range Output Level Resolution Output Distortion (>0.5 Vpk)

Output Level Accuracy Output Impedance

Maximum deviation may be increased up to that shown for the HET band than the values shown here. HET band can also be selected with Special Function 8.

Output level accuracy is typically ±3 dB.

0.3%

none <500 Hz <1 kHz

200 radians

100 radians 50 radians 25 radians

12.5 radians

6.25 radians

3.125 radians

1.5625

0.78125 radians

6.25 radians

100 radians

0.7% of setting or 0.0004% of

±(5%

<0.4% 20 Hz to 15 kHz

dcto 15 kHz

2509A to 2550A

>30dB

>45dB

<3.5 MS 50 kHz

6 MS

1.5V

20 Hz to 100 kHz

% of setting

0 to 3.3 Vpk 4 mV

<0.02%

<0.15%

±(4% 600 ohms ±10%

Performance Limits

7 7

radians

maximum deviation, whichever is larger

of setting +0.09 radians)

of setting

+15 mV)

2551A and above

>40dB >80dB

<400 ns 100 kHz

2 MS

1.5V

(0.1

MHz to 132.1875 MHz carrier frequency) by selecting deviation larger

Model 8642A/B

Conditions

20 kHz peak deviation, 1 kHz rate, >400 kHz carrier frequency, output level <+15dBm

ac and internal dc, 8642A/B Bands 1-9, HET dc, 8642B Band 10

1 kHz rate 1 kHz rate Internal and external ac

External dc Output levels <+15 dBm

8642A/B Bands 1-9, HET 8642B,

Band 10

10%

to 90%

External dc

Into 600 ohms

0.02 kHz to 15.8 kHz >15.8 kHz

Within 1s

1-10

rev.!6MAY86

Model 8642A/B

Electrical Characteristics

GENERAL

Operating Temperature Range Storage Temperature Range

Power Requirements

Line Voltage Line Frequency Power Dissipation

Electromagnetic Interference

(Leakage)

Net Weight Shipping Weight Dimensions

Height Width Depth

HP SYSTEM

Module Size

Electrical Characteristics

FREQUENCY SWEEP

Digitally Stepped Sweep

Start

and

Stop Sweep

Time

Table 1-1. Specifications (5 of 6)

Performance Limits

0°

55°C

-55°

+75°C

100V,

120V,

220V,

240V

47.5

to 440 Hz

300

VA max

MIL

STD 461B and FTZ 1115

+5%,

-10%

Conducted is within STD RE02.

the

461B

Interference the standards Also

leakage

duced

in a diameter, held any surface,

<0dBm.

32.7

kg (71.5 lb)

kg (95 lb)

133

mm (5.25 in.)

425

(16.75

617

mm (23.8 in.)

51AH

X 1W X 23D

nominal

in.)

nominal

Features

Sweeps between End-points In AUTO sweep mode, sweep must stay within through

9, or

Maximum sweep time: 999s. Minimum sweep time:

number

end-points

two

selected end-points

can be

anywhere within

band

1, or

band

10, or the HET

distinct frequency points

and

sweep time.

in a

linear, step-wise manner.

the

frequency range

the

band.

automatically selected based

General Information

Conditions

and

radiated interference

requirements

methods CE03

set by FTZ 1115.

of <0.5

two-turn loop

2.5 cm

for

output levels

of the

range

275 ms. A

of MIL and

also within

2.5 cm in

away from

instrument.

bands

maximum

is in-

on the

Phase Continuous Sweep

Start-Stop Sweep

Maximum Sweep Span

Band

10 (8642B only)

9 8 7 6 5 4 3 2

HET

Maximum sweep span

span larger than

may be

the

span shown here.

increased

up to

HET

Instrument sweeps between

continuous manner.

End-points

can be

outside

the

(Start Frequency + Stop Frequency)

800

kHz

400

kHz

200

kHz

100

kHz

can

9 9

kHz

for the HET

also

9 9

band (0.1

selected with Special Function

MHz to

50 kHz

25 kHz

12.5 kHz

6.25 kHz

3.125 kHz 25 kHz 400

that shown

band

two

selected end-points

band,

but

4- 2

must

132.1875 MHz carrier frequency)

in a

within

linear, phase

the

band.

selecting a frequency

1-11

General Information

Model 8642A/B

Table 1-1. Specifications (6 of 6)

Electrical Characteristics

FREQUENCY SWEEP (Cont'd)

Phase Continuous Sweep (Cont'd)

Sweep Time

X-Axis Output

Z-Axis Output

REMOTE OPERATIONS

HP-IB (IEEE 488-1978) Capability

Interface

Functions Controlled

HP-IB Address Select Code

Interface Function IEEE-488 Functions

Implemented

Features

Maximum sweep time: 999s. Minimum sweep time: 5 ms. Maximum and minimum sweep time are also dependent on end-point separation and quency band selected.

0 to 10 Vdc, ±10%

TTL positive true for crt display blanking during retrace.

Hewlett-Packard Interface Bus (HP-IB). HP-IB is Hewlett-Packard's implementation of IEEE Standard 488-1978.

All functions controlled from the front panel, with the exception of the

power switch and the knob, are programmable with the same accuracy

and resolution as in manual mode.

Settable via the front panel or over HP-IB from 00 to 30 (5-bit decimal equivalent). (A listen-only mode is also available as 31.)

Listener, talker, and controller SH1,

AH1, T6, TE0, L3, LEO, SR1, RL1, PP0, DC1, DT0, C1, C2, C3,

C28,

fre-

1-12

Model 8642A/B

General Information

Table 1-2. Supplemental Characteristics (1 of 2)

Supplemental characteristics are typical, but non-warranted performance parameters, intended to be useful in instrument applications.

FREQUENCY Underrange: 10 to 100 kHz. Heterodyne Mode (HET, Special Function 8): The 8642A/B

can derive its output through a heterodyne mode in the carrier frequency range from 0.1 MHz to 132.1875 MHz. This improves modulation and some frequency sweep characteristics at lower carrier frequencies.

Frequency Switching Time to Within 100 Hz of Final Frequency:

Processor Delay

20 ms

Frequency Settling

65 ms

Total Time

85 ms

SPECTRAL PURITY

SSB Phase Noise at 1 GHz Carrier Frequency (dBc in 1 Hz bandwidth):

10 Hz

-40

100

-75

kHz

-98

kHz

-131

kHz

-138

100 kHz

-146

200 kHz

-147

MHz

-147

MHz

-154

Measured SSB Phase Noise at 1 GHz:

_ -20

■

!-«

B -60

■

-160 10 100 Ik 10k 100k 1

Offset Frequency, Hz

. .

1 1 """

..1

. .

\ J

..1

. . ..-

M 1( MM

Mixed Modulation Types: Any two modulation types can be simultaneously selected except for FM + *M and AM + pulse modulation.

FREQUENCY MODULATION

Carrier Stability in FM Mode:

AC FM: Same as CW. DC FM: <4 kHz/hour, 8642A/B bands 1-9, HET.

<8 kHz/hour, 8642B band 10.

FM Stereo Separation, Ext de-Coupled, HET Band (Special Function 8): >50 dB, 1 kHz rate, 75 kHz deviation.

Low Distortion FM/$M (Special Function 5 or

112):

Distortion in either FM or $M can be reduced with this function. FM stereo separation unaffected.

FM Distortion in Special Function 7: <0.03% THD, <1/15 maximum deviation, external rates <50 kHz and internal rates <15.8 kHz.

FM Pre-emphasis (Special Function 6): Provides preemphasis in FM with a 750

time constant. This is

useful when testing FM communications receivers.

AMPLITUDE MODULATION

(for V0R, ILS, Avionics Applications)

AM Phase Shift, DC Coupled, for Carrier Frequencies From 108

MHz to

118

MHz: 30 Hz rate: <±0.01°. 30 Hz to 10 kHz rate: <±3°. Difference from 9 kHz to 11 kHz rates: <2°.

AM Flatness, DC Coupled External AM:

<0.04 dB, 90 to 150 Hz, 108 to 118 MHz and 329

to 335 MHz. (<0.00092 DDM @ 20% AM and

<0.0019 DDM @ 40% AM.) <0.1 dB, 9 to 11 kHz, 108 to 118 MHz.

SSB AM Noise Floor at 200 kHz Offset, +16 dBm:

<-157 dBc/Hz, band 2 through 9.

<-150 dBc/Hz, band 10.

MODULATION

External Input Impedance: 600 ohms, ±10%.

External Input Level Required: 1 Vpeak for specified accu-

racy. Front-panel annunciators indicate application of 1V peak signal ±5%, 20 Hz to 100 kHz. When greater accuracy is required, modulation drive voltage should be monitored externally.

Modulation Source Capability: All modulation types can be driven with either an internal or external modulation source. AM, FM, and $M can also be driven simultaneously by both internal and external modulation sources.

OUTPUT

Absolute Accuracy: ±3 dB, output level <-127dBm. Output Level Switching

Time:

<100 ms from receipt of last

controller command. Amplitude Sweep, in CW and Angle Modulation Modes:

Range: 20 dB log (or linear with Special Function 122)

sweep (10 dB underrange available).

Sweep Time: 20 ms minimum, 999s maximum. Accuracy:

± 1

dB over highest 10 dB. ±3 dB over sec-

ond highest 10dB.

Attenuator Range Hold (Special Function 9): The internal step attenuator can be fixed and the electronic level vernier varied up to 30 dB for monotonic level setting. This is useful in measuring of receiver squelch hysteresis.

1-13

General Information

Model 8642A/B

Table 1-2. Supplemental Characteristics (2 of 2)

Supplemental characteristics are typical, but non-warranted performance parameters, intended to be useful in instrument applications.

INTERNAL REFERENCE OSCILLATOR EXTERNAL REFERENCE

Characteristic Aging rate

Temperature

Line voltage

Output, rear panel:

Frequency: 10 MHz.

Level:

>1.4 Vp-p into 50 ohms.

Impedance: 75 ohms.

±2 ppm/year ±4 ppm, 0° to 55°C

±0.1 ppm,

Standard

+5%,

-10%

High Stability

(opt. 001)

See Table 1-1

±7 x 10~9,

0° to 55°C

±3 x 10-9,

+5%,

-10%

Input, rear panel:

Frequency: 1, 2, 5, or 10 MHz, ±25 ppm.

Level:

<6 Vp-p.

Impedance: 50 ohms.

rev.l8MAY89

Model 8642A/B

Instrument

Table

1-3.

Recommended Test Equipment

Critical Specification

(1 of 2)

Recommended Model

General Information

Use

Attenuator, Fixed

Digital Voltmeter

(DVM)

Frequency Standard

Low-Noise Amplifier

Low-Pass Filter

Measuring Receiver

Mixer

Oscilloscope

Service Accessory

Kit

Signal Generator

Spectrum Analyzer

P = Performance Testing,

HP 11801A services

the HP

Attenuation: Frequency Range:

Accuracy:

SWR: Accuracy:

Range: Sensitivity:

Frequency: Long Term Stability:

±0.1 dB

<1.3

41/2

10 mV to

10 /A/

10 MHz

required

100

kHz-2115

digit, ±0.05% reading

600V

<1 X

Input/Output Impedance: Frequency Bandwidth: Noise Figure: Gain:

40 ±1 dB

Bandwidth:

Impedance:

<3 dB

1 MHz

ohms

1 kHz to 1 MHz

Modulation:

Accuracy: AM Rejection:

FM Rejection: <0.2%

±2% of

kHz BW)

reading

<30 Hz at 50% AM

AM (50 kHz FM)

Power:

Frequency Range: Power Range:

Accuracy:

±0.2 dB

0.1 to 2115 MHz

+20 to -20 dBm

Tuned Power:

Frequency Range: Power Range:

Accuracy:

±0.5 dB

2.5 MHz to 1300 MHz

0 dBm to -127 dBm

Frequency:

Resolution:

10 Hz

Audio Distortion (Typical Residual):

<-60

Frequency:

Type:

Frequency:

Type: Vertical Sensitivity:

Bandwidth: Required

See Table

Frequency: Output:

0.2 to 500 MHz

Double Balanced

500 to 2115 MHz

Double Balanced

mV/division

100 MHz

for

servicing

1-5 for

and

parts listing

.1 to 2115 MHz

-50 dBm to +18 dBm

SSB Phase Noise: same

specification

Frequency Range: Resolution Bandwidth: Dynamic Range:

A =

Adjustments,

8642A,

for the

90 dB

T =

Troubleshooting

11801B services

Generator under test.

100 Hz to

<10 Hz

the HP

performance test

MHz

±1

10"10/24 hours

ohms

troubleshooting.

and

description.

better than

6345

MHz

8642B,

and HP

11801C services

digit

the

HP 8491A

HP 3456A

HP 5065A

HP 08640-60506

Requires

19-25 Vdc

Power Supply

See Figure

1-1

HP 8902A

Opt.

002

(Opt.

003 for

Optional Residual

HP 10514A

Watkins-Johnson

M94C

HP 1980B/HP 19860A

(see Table

1-4)

HP 11801A/B/C

HP 8642B

(see Table

1-4)

HP 8566A/B

both.

Test)

A, T

1-15

General Information

Instrument

SWR Bridge

Function Generator

Table 1-3. Recommended Test Equipment (2 of 2)

Critical Specification Directivity: >40 dB Max. Rate: >50 kHz

Min.

Pulse Width: <6 ^sec

Rise Time: <100 nsec

Recommended Model

Wiltron 60NF50

HP 8116A

Model 8642A/B

Use

P P

Signal Generator (optional)

Short, Type N

Feedthrough Termination, BNC

P = Performance Testing, A = Adjustments, T = Troubleshooting

Residual SSB phase noise in 1 Hz BW

(320 MHz < fc < 640 MHz) with an offset from the carrier of:

-100 dBc at 10 Hz,

-121 dBc at 1 kHz, and

-131 dBc at 10 kHz

z0 = 600 ohms ±1%

HP 8662A (for

Optional Residual FM Test)

HP 11512A HP 11095A

(see Table 1-4)

P P

Instrument

Digital Voltmeter (DVM)

Signal Generator

Oscilloscope

Feedthrough Termina-

tion,

BNC

1-16

Figure 1-1. 1 MHz Low-Pass Filter

Table 1-4. Alternative Test Equipment

Recommended Model

HP 3456A

HP 8642B

HP 1980B/HP 19860A

HP 11095A

Suggested Alternative

HP 3455A

HP 8340A HP 8341A HP 8663A HP 8662A

HP 1740A

HP 0757-1100

Advantage of Alternative

Satisfies the requirements for testing the Signal Generators.

Satisfies the requirements for testing the Signal Generator except:

Third Order Intermodulation Test re-

quires +18dBm at 1050 MHz.

Optional Phase Noise Test requires

phase noise less than or equal to the unit under test.

3. The 8662A satisfies the RF frequency range for 8642A testing.

Satisfies the requirement for testing the Signal Generator.

Model 8642A/B

Part

Number

08642-60889

08642-69889 08642-60890

08642-69890 08642-60891

08642-69891 08642-60892

08642-69892

08642-60893 08642-69893

08642-60894 08642-69894

08642-60895 08642-69895

08642-60896 08642-69896

08642-60897 08642-69897

08642-60898 08642-69898

08642-60899

08642-69899 08642-60842

08642-69842 08642-60843

08642-69843

08642-60844 08642-69844

. 2110-0010

2110-0002

2110-0036 2110-0004

08642-60845

08642-69845

08642-60133 08642-69133

08642-80019

2110-0003 5021-0844

1250-0832 1250-1697 1250-0827 8710-0033 9222-0779 9222-0698 8710-1465 8710-1493

8710-1541 08662-60080 08662-60075

1400-0249

Check Digit

7 5

0 8

1 9

2 0

3 1

4 2

7 5

8 6

9 7

2 0

4 2

9 9 9 1

5 3

4 2

7 0

1 8 5

1 4 7

Table 1-5. HP 11801C On-Site Service Kit (1 of 1)

Quantity

5 5

8 8

1 5 2

2 2 4

8 1 1 1 4 1

Keyboard/LCD Display Module Keyboard/LCD Display Module (Restored)

Modulation Module Modulation Module (Restored)

Processor/Memory Module Processor/Memory Module (Restored)

Latch Module Latch Module (Restored)

FM Loop/Counter/Timebase Module FM Loop/Counter/Timebase Module (Restored)

SAWR Loop Module SAWR Loop Module (Restored)

IF Loop Module IF Loop Module (Restored)

Reference Loop Module Reference Loop Module (Restored)

Sum Loop/Divider Module Sum Loop/Divider Module (Restored)

Output Filters/ALC Module Output Filters/ALC Module (Restored)

Heterodyne Module Heterodyne Module (Restored)

Attenuator Module—8642A Only Attenuator Module (Restored) 8642A Only

Power Supply Regulators/Attenuator Drivers Module

(Restored)

Power Supply Rectifier/Filter Module Power Supply Rectifier/Filter Module (Restored)

'Fuse 5A 250V NTD 1.25 X .25 UL

Fuse 2A 250V NTD 1.25 X .25 UL Fuse 8A 125V NTD 1.25 X .25 UL Fuse .25A 250V NTD 1.25 X .25 UL

Doubler/Attenuator Module—8642B Only Doubler/Attenuator Module (Restored) 8642B Only

Calibration Module Calibration Module (Restored)

Fan Assembly Fuse 3A 250V NTD 1.25 X .25 UL Adapter, BNC to Banana Plug

Adapter, Coax STR Female BNC to Female SMC Adapter, Coax STR Male SMA to Female SMC Adapter, Coax STR Male SMC to Male SMC Alignment Tool, Screwdriver .075 Bag,

Anti-static 16 x 0 inch Opening

Bag,

Anti-static 4x0 inch Opening Bit, Torx T10 Bit, Torx T15 Bit, Torx T5 Cable Assembly, Short Cable Assembly, Service Kit, Long Cable Tie, .062-.625 Dia. .091 Wd Nylon

Description

General Information

Reference

Designation

A11

A12

A13

A14

A16

A17

A18

A18F1

A18F2/F4

A18F3 A18F5

A19

A20

B1 F1

1-17

General Information

Part

Number

Table 1-5. HP 11801C On-Site Service Kit (2 of 2)

Check Digit

Quantity

Description

Model 8642A/B

Reference

Designation

11801-90201

11801-90203

1251-8601 1251-8248 1251-8105 1251-8823

08642-20041

11801-90202 11801-90204 08642-40073

9300-0980 2140-0536

08642-90020

9320-3944

11801-90001

34118A

08642-00070

8730-0012 9300-0985

1250-0781

1250-0837

08642-80053

1251-5653

0 2 7 8 6 5 9

1 3 9 2

Case,

Large

Case,

Small Connector, Ribbon Cable, 34 Pin Connector, Ribbon Cable, 26 Pin Connector, Ribbon Cable, 16 Pin

Connector, Ribbon Cable, 14 Pin Extender Post Foam,

Top and Bottom (for large case)

Foam,

Top and Bottom (for small case) Fuse Puller Grounding Strap, Anti-Static Lamp,

Incand. 5 Vdc, 115 mA, T-1 Bulb On-Site Service Manual Storage Box, Plastic, 1 Compartment Storage Box, Plastic, 10 Compartments Tag,

Blue Stripe

Tag,

Defective Test Lead Kit Wrench,

Wrench,

Wristband,

BNC Tee (f, m, m)

• SMC Tee (m, m, m) Power Supply Test Connector

Connector, Ribbon Cable, 50 Pin

RF Connector

Torque

Antistatic

1-18

Model 8642A/B

General Information

Item Number

1 2 3 4 5 6 7 8 9

10 Not Shown Not Shown Not Shown Not Shown Not Shown Not Shown Not Shown

13 Not Shown

15 Not Shown

20 21 22 23 24 25 26

11 -;„„:;:;_::;„

16l

\ H II II II

(i II ll' II II

Part Number

1250-0832 1250-0827 1250-1200 1250-0838 8710-0630 8710-0033 8710-1515 8710-1465 8710-1493

8710-1541 08642-60135 08642-60137 08642-60134 08662-60080 08662-60075 11802-90202 11802-90201

1251-5653

1251-8601

1251-8248

1251-8812

1251-8105

1251-8823

1252-0153

1250-0839

1250-1598 08642-40073 08642-60951 08642-60078 08642-60079 08642-20089 08642-00070

9300-0980

8730-0012

9300-0985

14 15

19 20 21

JULll.

iUUi JUUt

"J&C -4(33 -idzS

Check Digit

1 6 4 7 4 9 8 2

1 6 8 5 4 7 2

1 3 7 8 2 6 5 0 5 5 9 4 6 7 5

1 2

1 7

i! 3 |l 22 i-

H | 5 23

-X. A-

18 26

Quantity Part Description

Adapter, Coax STR Female BNC to Female SMC Adapter, Coax STR Male SMC to Male SMC Adapter, SMA to BNC Adapter, Tee, Female, Male, Male SMC Alignment Alignment Alignment

Bit, TorxTIO Bit, Torx T15 Bit, Torx T5 Board Assembly, Latch Extender Board Assembly, Processor Extender

Board Assembly, Signature Analysis Cable Assembly, Short Cable Assembly, Service Kit, Long Case,

Foam, Connector, Ribbon Cable, 50 Pin

Connector, Ribbon Cable, 34 Pin Connector, Ribbon Cable, 26 Pin

Connector, Ribbon Cable, 20 Pin

Connector, Ribbon Cable, 16 Pin

Connector, Ribbon Cable, 14 Pin

Connector, Ribbon Cable, 10 Pin Terminal,

Connector, Male SMC, RF

Fuse Puller

Probe,

Reference/Sum Loop

RF Connector Wrench

Strap,

Wrench, Wristband,

Tool,

Screwdriver .08

Tool,

Screwdriver .075

Tool,

Square, .030

20.8 x 14.8 Top and Bottom

Female SMC

4 Pin Mixer

8 Pin Mixer 8-Pin

Power Splitter

Anti-static Grounding

Torque .2-.4 Newton-meters

Anti-static

Figure 1-2. Bench Service Kit

1-19

DECLARATION OF CONFORMITY

according to ISO/IEC Guide 22 and EN 45014

Manufacturer's Name:

Manufacturer's Address:

Hewlett-Packard Co. Spokane Division

24001 E. Mission Avenue Liberty Lake, Washington 99019-9599 USA

declares that the product

Product Name: Model Number:

Product Options:

Signal Generator

HP8642Aand HP8642B

This declaration covers all options of the

above product.

conforms to the following Product specifications:

Safety: HD401/IEC348

EMC:

CISPR11:1990/EN

55011:1991

Group

IEC 801-2:1984/EN 50082-1:1992 4 kV IEC 801-3:1984/EN 50082-1:1992 3 V/m IEC 801-4:1988/EN 50082-1:1992 0.5 kV

Class A

CD,

Sig.

8 kV AD

Lines, 1 kV Power Lines

Supplementary Information: The product herewith complies with the requirements of the Low Voltage Directive

73/23/EEC and the EMC Directive 89/336/EEC. Safety qualification of this product was performed 10-5-89 (Report

Spokane, Washingtion, USA October

European Contact: Your local Hewlett-Packard Sales and Service Office or Hewlett-Packard

ZQ/Standards Europe, Herrenberger Strasse 130.

Date

1995

D-71034

Vince Roland/Quality Manage!

BSblinger, Germany (FAX +49-7031-14-3143)

no.

SA8642-89).

GmbH,

Department

NOTE: During operation of the HP 8642A/B a 4 kV contact electrostatic discharge to "AM/Pulse Input"

or "Modulation Input" ports may cause temporary degradation of performance requiring operator

intervention.

Model 8642A/B

SECTION II

INSTALLATION

2-1.

INTRODUCTION

This section provides the information needed to install the HP 8642A/B Synthesized Signal Generator. Included is information pertinent to initial inspection, power requirements, line voltage selection, power cables, interconnection, environment, instrument mounting, storage, and shipment.

2-2.

INITIAL INSPECTION

WARNING!

To avoid hazardous electrical shock, do not perform electrical tests when there are signs of shipping damage to any portion of the outer enclosure (covers and panels).

Installation

Inspect the shipping container for damage. If the shipping container or cushioning material is damaged, it should be kept until the contents of the shipment have been checked for completeness and the instrument has been checked mechanically and electrically. Procedures for checking electrical performance are given in Section IV, Performance Tests. If the contents are incomplete, if there is mechanical damage or defect, or if the instrument does not pass the electrical performance test, notify the nearest Hewlett-Packard office. If the shipping container is damaged, or the cushioning material shows signs of stress, notify the carrier as well as the Hewlett-Packard office. Keep the shipping materials for the carrier's inspection.

2-3.

PREPARATION FOR USE

Power Requirements

The Signal Generator requires a power source of 100 Vac (90 to 1 05 Vac), 120 Vac (1 08 to 126 Vac),

220 Vac (198 to 231 Vac), or 240 Vac (216 to 252 Vac), 47.5 to 440 Hz single phase.

Power consumption is 2b0 VA maximum (270 VA during attenuator switching).

2-1

Installation

WARNING)

This is a Safety Class I product (i.e., provided with a protective earth terminal).

the Mains power source to the product input wiring terminals, power

cord, has been impaired, the instrument must be made inoperative and be secured against any unintended operation.

If this instrument is to be energized via an external autotransformer for voltage reduction, make sure that the common terminal is connected to the earthed pole of the power source.

An uninterruptible safety earth ground must be provided from

or supplied power cord set. Whenever it is likely that the protection

CAUTION

BEFORE PLUGGING THIS INSTRUMENT into the Mains (line) voltage, be sure the correct voltage and fuse have been selected.

A rear-panel, line power module permits operation from 100, 120, 220, or 240 Vac. The number visible in the window (located on the module) indicates the nominal line voltage to which the instrument must be connected. Verify that the line voltage selection card and the fuse are matched to the power source. Refer to Figure 2-1, Line Voltage and Fuse Selection.

Model 8642A/B

Two fuses are supplied with each instrument. One fuse has the proper rating for 110/120 Vac line operation (HP part number 2110-0003; 3A, 250V, non-time-delay). The other fuse is rated for 200/220 Vac operation (HP part number 2110-0002; 2A, 250V, non-time-delay).

One fuse is installed in the instrument at the time of shipment. The rating of the installed fuse is selected according to the line voltage specified by the customer. If the voltage is not specified, the rating of the installed fuse will be selected according to the country of destination.

WARNING)

For protection against fire

normal blow fuse with the correct current rating.

hazard,

the line fuse should only be a 250V

2-2

Model 8642A/B

Installation

Operating voltage is shown in module window.

Selection

Open cover door, pull the FUSE PULL lever and rotate to left. Remove the fuse.

Remove the Line Voltage Selection Card. Position the card so the line voltage appears at top-left

corner. Push the card firmly into the slot.

3. Rotate the FUSE PULL lever to its normal position. Insert a fuse of the correct value in the holder. Close the cover door.

Operating Voltage

Figure 2-1. Line Voltage and Fuse Selection

Power Cables

WARNING

BEFORE CONNECTING THIS INSTRUMENT, the protective earth terminal of the instrument must be connected to the protective conductor of the (mains) power socket outlet provided with a protective earth contact. The protective action must not be negated by the use of an extension cord (power cable) without a protective conductor (grounding). Grounding one conductor of a two conductor outlet is not sufficient protection.

cord.

The mains plug shall only be inserted in a

This instrument is equipped with a three-wire power cable. When connected to an appropriate ac po'.cr receptacle, this cable grounds the instrument cabinet. The type of power cable plug shipped with each instrument depends on the country of destination. Refer to Table 2-1 on page

2-4 for tlie part numbers of the power cables and Mams plugs > ailable.

2-3

Installation

Table

2-1. AC Power

Cables

Model 8642A/B

Availiable (P/O ERRATA)

Plug

Type

250V

L N

□ □

250V

L N 1

250V

\N L/

125V

/o\

/ E \

if)

100V

(Same plug as above)

250V

/ ^ \

III)

Cable

HP Part

Number

8120-1351 8120-1703

8120-1369 8120-0696

8120-1689 8120-1692

8120-1378 8120-1521

8120-1751

8120-4753 8120-4754 8120-2104

8120-2296 8120-3997

8120-0698

C D

90°/STR BS1363A*

90°/90°

STR/STR

NZSS198/ASC112*

STR/90°

STR/STR*

STR/90

STR/STR NEMA5-15P*

STR/90

STR/STR

STR/90

STR/STR SEV1011

1959-24507

Type 12

STR/90

STR/STR NEMA6-15P

Plug

Description

0 0

Cable

Length

(inches)

90 90

79 79

177

Cable

Color

Mint Gray Mint Gray

Gray

Mint Gray Mint Gray

Jade Gray

Dark Gray Dark Gray

Gray

Gray Gray

Black

For Use

In Country

United Kingdom, Cyprus, Nigeria, Rhodesia, Singapore

Austrailia, New Zealand

East and West Europe, Saudi Arabia, Egypt, (unpolarized in

many nations)

United States, Canada, Mexico, Phillipines, Taiwan U.S./Canada

Japan only Japan only

Switzerland

United States, Canada

250V

/E'O'N.

(□

250V

(L„

_N)

8120-2956 8120-2957 8120-3997

8120-4211 8120-4600

90°/STR

3 4

90°/90°

STR/STR

STR/STR*IEC83-B1

STR/90

79 79

Gray

Black

Gray

Denmark

South Africa, India

\0 0/

250V

if^'D^

D D

I L N

* Part number shown for plug is industry identifier for plug only. Number shown for cable is HP Part Number for complete

cable including

8120-1860

8120-1575 8120-2191 8120-4379

plug.

E = Earth Ground; L = Line; N = Neutral; STR = Straight

STR/STR*CEE22-V1

(Systems Cabinet Use) 0 8 8

STR/STR

STR/90

90°/90°

31 59 80

2-4

Jade Gray

Jade Gray Jade Gray Jade Gray

rev.07JUL87

HP-IB Address Selection ^ilBli^ The Signal Generator's address is set to 19 at the factory both in RAM memory and an internal switch located inside the instrument. The address stored in RAM remains valid through switching the power from standby to on and unplugging of the ac power cord (unless the internal battery power is lost which would cause RAM memory to be lost). If RAM memory is ever lost, the address on the internal switch is read and becomes the address at turn on. Refer to page 3-8 for procedures to set the Signal Generator's HP-IB address.

Interconnections ^itiflli^ Interconnection data for the Hewlett-Packard Interface Bus is provided in Figure 2-2, HewlettPackard Interface Bus Connections.

Mating Connectors

Interface Connector. The HP-IB mating connector is shown in Figure 2-2. Note that the two

securing screws are metric.

Coaxial Connectors. Coaxial mating connectors used with the Signal Generator should be either the 50-ohm BNC male connectors or 50-ohm Type-N male connectors that are compatible with those specified in US MIL-C-39012.

Operating Environment The operating environment should be within the following limitations:

Temperature 0°Cto+55°C Humidity 5 to Altitude <4570 meters Airflow 5.8 mm (0.23 in.) minimum clearance underneath the instrument and suffi-

Rack Mounting

The Signal Generator is heavy for its size (32.7 kg, 71.5 lb). Care must be exercised when lifting to avoid personal injury.

95%

(maximum wet bulb temperature = 40°C)

(1 5

000 feet)

cient clearance at the instrument's right side for air flow that is not obstructed.

WARN

JNG]

CAUTION

When rack mounting, it is important that proper support rails are used to support the Signal Generator. Additional support rail sets for HP cabinets can be ordered under HP part number 12679B.

rev.20MAR85

2-5

Installation

Rack mounting information is provided with the rack mounting kit. If the kit was not ordered with the instrument as an option, it may be ordered through the nearest Hewlett-Packard office. For rack-mount kit part numbers, refer to page 1-4, paragraph 1-9, Options Available with the Instrument, under Mechanical Options.

The Rack-Slide Kit enables service personnel to slide the Signal Generator away from the cabinet and service it at the operating site. Therefore, if you plan to take advantage of the On-Site Service Strategy for the HP 8642A/B, we recommend that you use the Rack-Slide Kit to rack mount the instrument. For instrument cabinet frames using metric hardware, the HP part number is 08642-80059. For instrument cabinet frames using English hardware, the HP part number is 08642-80058. (Note that if metric hardware is used, the rear panel of the instrument mentions that fact.)

2-4. STORAGE AND SHIPMENT

Environment The instrument should be stored in a clean, dry environment. The following environmental limitations apply to both storage and shipment:

Temperature - 5 5°C to + 7 5°C Humidity 5% to 95% (maximum wet-bulb temperature = 40°C) Altitude

5 300 meters (50 000 feet)

Model 8642A/B

Packaging

Original Packaging. Containers and materials identical to those used in factory packaging are available through Hewlett-Packard offices. If the instrument is being returned to Hewlett-

Packard for servicing, attach a tag indicating the type of service required, return address, model number, and full serial number. Also mark the container FRAGILE to assure careful handling.

In any correspondence refer to the instrument by model number and full serial number.

Other Packaging. The following general instructions should be used for repackaging with commercially available materials:

Wrap the instrument in heavy paper or plastic. (If shipping to a Hewlett-Packard office or

service center, attach a tag indicating the service required return address, model number, and full serial number.)

Use a strong shipping container. A double wall carton made of 2.4 MPa (350 psi) test

material is adequate.

Use enough shock-absorbing material (75 to 100 mm layer; 3 to 4 in.) around all sides of the

instrument to provide firm cushion and prevent movement in the container. Protect the front panel with cardboard.

Seal the shipping container securely.

Mark the shipping container FRAGILE to ensure care,'

«1

handling.

2-6

rev.20MAR85

Model 8642A/B

Installation

/^\

SHOULD

GROUNDED NEAR TERMINATION OF OTHER WIRE TWISTED PAIR

SIGNAL GROUND P/O TWISTED PAIR WITH P/O TWISTED PAIR WITH

P/O TWISTED PAIR WITH P/O TWISTED PAIR WITH P/O TWISTED PAIR WITH P/O TWISTED PAIR WITH

DIO

DIO DIO DIO

ISOMETRIC THREAD

M3.5 x 0.6

11 10

9 8 7 6

REN

8 7 6 5

SHIELD —CONNECT ATN EARTH SRQ GROUND IFC NDAC NRFD DAV EOI DIO

DIO

24-PIN MICRO-RIBBON (SERIES

57)

CONNECTOR

Logic Levels

The Hewlett-Packard Interface Bus logic levels are TTL compatible, i.e., the true (1) state is 0.0 Vdc to +0.4 Vdc and the false (0) state is 2.5 Vdc to +5 Vdc.

Programming and Output Data Format

Refer to Section III, "Operation".

Mating Connector

HP 1251-0293; Amphenol 57-30240.

Mating Cables Available

10631 A,

1 metre (3.3 ft.), HP 10631B, 2 metres (6.6 ft.)

HP 10631C, 4 metres (13.2 ft.), HP 10631D, 0.5 metres (1.6 ft.)

Cabling Restrictions

A Hewlett-Packard Interface Bus system may contain no more than 2 metres (6.6 ft.) of connecting cable

per instrument.

The maximum accumulative length of connecting cable for any Hewlett-Packard Interface Bus system is

20 metres (65.6 ft.).

Figure 2-2. Hewlett-Packard Interface Bus Connections ^JJJTJ^

2-7

Model 8642A/B

INTRODUCTION TO SECTION

The information in this section describes both general and specific operation of the HP 8642A/B.

If you have no experience with the Signal Generator, you should first read Operating Fundamentals

(included with this Volume I as a separate booklet) which is intended only as a familiarization guide. Although this Section III can be used to learn basic operation, you might feel there is more information here than you need. After you read Operating Fundamentals you can use this Operation Section for additional information.

Figure 3-l in Operating Information (page 3-3) is a graphic representation of the Signal Generator’s

basic operation. This figure shows most of the keys that you use to operate the instrument. Similar

diagrams that show more specific functions (and their associated keys) are available on pages 3-34, 3-38, 3-68, 3-96, 3-136, 3-156, 3-166, and 3-178. Figure 3-2 on page 3-4 shows rear-panel features.

The major functions of this section are grouped as follows:

Operation

Section 3

OPERATION

OPERATOR

Since the Signal Generator performs self-checks, no operator checks are necessary. However, extensive self-diagnostics are available. Refer to the Service Section (Volumes 2 through 4).

A flashing display indicates that an operating message is present. Refer to the tabbed Messages

information later in this section for details.

Operating Information HP-IB Remote Operation Detailed Operating Instructions

RF Frequency Amplitude Modulation Setting Modifications Recall Registers

Special Functions

Messages Appendixes Index

CHECKS

rev.30SEP88

3-l

Operation

DETAILED OPERATING INSTRUCTIONS

The Detailed Operating Instructions are organized into major categories that are decribed on the previous page under the "Introduction to Section III". Each operating instruction begins on a right facing page for easy accessibility. This .'■leans that sometimes you will see a blank page before the beginning of an operating instruction. Each of the Detailed Operating Instructions provides specific, function-related information. We have arranged each of these instructions in the following format:

Description The information given under "Description" provides an overall description of the function(s) to be discussed in that particular operating instruction. The Signal Generator's front-panel functions are divided into three types: Key Functions, Shift Key Functions, and Special Functions.

Key Functions. Key functions are labeled directly on the key that accesses the function. You can access a key function by pressing the key directly. In these instructions, we show the key function's label in capital letters surrounded by what resembles a key shape (for example, [ FREQ 1 or I AMPTD 1 ).

Shift Key Functions. Shift key functions are labeled in blue above the key that accesses the function (for example, REF SET or REL ZERO). You can access a shift key function by first pressing the blue I SHIFT I key (which causes the display to show "SHIFT") and then the key under the blue label. In these instructions, we show the shift key function's blue label in capital letters (for example, REF SET) followed by the actual key you need to press to access that function. That is, we would show: REF SET (I SHIFT I ( FREQ I ).

Model 8642A/B

Special Functions. You can turn on a special function by pressing SPCL ( [ SHIFT 1 I - J ), then by keying in the code number of the desired special function. (After you select a special function, its code and description are displayed. You can clear this message from the display by pressing the [ SHIFT J key twice.)

Procedures The "Procedures" provide examples to show you how to operate the function (or functions) explained in the "Description". Before each example, we instruct you to select Instrument

Preset to put the Signal Generator in a known state so that your instrument will display identical settings as in the display portion of our examples.

HP-IB Codes All HP-IB codes relevant to that operating instruction are listed.

Comments

The "Comments" add extra information about the function(s) that might be valuable.

Related Special Functions

The "Related Special Functions" list and describe some special functions that might apply

to the main function.

Related Operating Instructions This listing refers you anywhere else in the Detailed Operating Instructions that will

provide related information about the topic or topics you are reading about.

3-2

Model 8642A/B

o o

T START

I AMPTD

,Hf STOP

[ AMPTD

5gKE?l

FREQ I AMPTD

]

AM FM U

MOD OUT

C§DLCD

U-

ra s 00

BCD000 0QQ0B 00D00'

These keys make the main functions of the Signal Generator active functions so they can be set using either Data keys, the Knob, Step keys, or the Off/On key.

Operation

□ □

(Z)

CD CD

"CD

(T") (T~) (0T) pr^

CD CD C1D CD □

"{D Q

INCR

SET

dD S=

□

■CD]

The cursor designates which function is active.

The blue Shift key enables you to access the functions

labeled in blue.

These keys are used to set the values of the Signal

Generator functions.

(3=

The Knob usually modifies a specific digit in the display. The keys select which digit will be modified.

The keys can also select Knob Hold or Knob Increment.

The Step keys enable you to step a function by the

value that was set using the [SET ) key.

:E)

Figure 3-1. An Overview of the Basic Functions of the 8642A/B

The Off/On key toggles an active function off or on with a single keystroke.

3-3

Operation

Model 8642A/B

10 MHz OVEN OUT is the Option 001 high stability time base output. This output is connected to the external reference input to obtain improved stability.

EXT REF INPUT locks to 1, 2, 5, or 10 MHz

HP-IB connector is used to connect the Signal Generator to an external controller for remote operation.

Z-AXIS output provides a blanking pulse for oscilloscope display blanking during retrace.

Optional rear-panel outputs and inputs (Option 002).

10 MHz OUT is locked to the reference oscillator in use.

3-4

The line fuse.

Back-up instrument calibration data is stored in a circuit board located in this housing.

Figure 3-2. Rear-Panel Features

Model 8642A/B

Operation

HP-IB CONTENTS

HP-IB REMOTE OPERATION 3-7 HP-IB ADDRESS 3-8

Available Addresses 3-8

To Display the Current Address 3-8

ENT ADRS 3-8

To Change the Address 3-8

HP-IB CAPABILITIES 3-9

Overview 3-9 HP-IB Capabilities 3-9 Table 3-1. HP-IB Capability

ReferenceTable 3-10

DATA INPUT 3-11

Overview 3-11 Table 3-2. Data Input Example 3-11 Program Codes 3-11 Input Syntax 3-11 Table 3-3. Relationship Between

Keystrokes and HP-IB Code

Sequences 3-12 Sequence Dependency 3-12 Figure 3-3. Flowcharts for

Sequence Dependency 3-13 Valid Character Entry 3-14

DATA OUTPUT 3-15

Overview 3-15 Output Messages (OH, OE, OC) 3-16 Output Active Function (OA) 3-18 Table 3-4. Output Active Function

String Formats 3-19 Output HI, LO Status (OL) 3-20 Output Display Information 3-21 Table 3-5. Output Display; Binary

Weight of Annunciators 3-22

Table 3-6. Error Code and Message

Recovery Example Program 3-23

CLEAR 3-24

Overview 3-24

REMOTE, LOCAL 3-25

Local to Remote Transition 3-25

LOCAL 3-25

Remote to Local Transition 3-25

LOCAL LOCKOUT, SET LOCAL 3-26

Local Lockout 3-26 Clear Lockout/Set Local 3-26

SERVICE REQUEST 3-27

Overview 3-27

RQS MASK 3-27

Clearing the Service

Request Message 3-27

Figure 3-4. The Status Byte and

RQS Mask 3-28

STATUS BYTE 3-29

Overview 3-29 Reading the Status Byte 3-29 Clearing the Status Byte 3-29

Table 3-7. HP-IB Status Byte

Bit Definitions 3-30

ADDITIONAL HP-IB INFORMATION 3-31

Abort 3-31 Trigger 3-31 Status Bit 3-31 Controller Capabilities; Self Test

and Calibration 3-31

Display Control Via HP-IB 3-31

Remote Indicators 3-31 Disabling the Listen

Addressed State 3-31

Disabling the Talk Addressed State 3-31

HP-IB CODES SUMMARY 3-32

Table 3-8. Signal Generator Function

to HP-IB Code 3-32

Table 3-9. Signal Generator HP-IB

Code to Function 3-33

HP-IB RELATED FRONT-PANEL KEYS 3-34

Figure 3-5. HP-IB Related

Front-Panel Keys 3-34

HP-IB RELATED TERMS 3-35

3-5

Model 8642A/B Operation

HP-IB REMOTE OPERATION

The 8642A/B is fully programmable via the Hewlett-Packard Interface Bus (HP-IB) which can be operated with any Hewlett-Packard computing controller or computer for automatic system applications. For more information about HP-IB, refer to one or all of the following documents:

• IEEE Standard 488-1978,

• ANSI Standard MC 1.1,

• "Improving Measurements in Engineering and Manufacturing" (HP part number 5952-0058) (the Hewlett-Packard catalog of Electronic Systems and Instruments), or

• "Tutorial Description of the Hewlett-Packard Interface Bus" (HP part number 5952-01 56). All front-panel functions are programmable over HP-IB except Knob rotation and switching the Power

from Standby to On.

3-7

Operation

Model 8642A/B

HP-IB ADDRESS

The Signal Generator's address is set to 1 9 at the factory both in RAM memory and on an internal switch located inside the instrument. You can change the address in RAM from the front panel.

The address stored in RAM remains valid through switching the Power from Standby to On and unplugging of the ac power cord. However, if the internal battery power is lost, RAM memory is lost and the Signal Generator reads the address on the internal switch. The internal switch address then becomes the address at turn on. At any time, the instrument's HP-IB address can be displayed from the front panel.

Available Addresses

Any address from 00 to 30 can be assigned to the instrument.

Setting an address of 31 establishes the Signal Generator as a listen-only device. The

listen-only mode causes the instrument to allow either HP-IB or local operation. However, any keys pressed while the Signal Generator is receiving HP-IB information could suspend the instrument in an unknown state. Also, with this address setting, the HP-IB control lines should be left open-circuited: IFC, ATN, REN, SRQ, and EOI (Refer to Figure 2-2 on page 2-7 for HP-IB connector pin numbers for these lines.)

To Display the Current Address

ENT ADRS To Change the Address

Comments

From the front panel, select ENT ADRS (I SHIFT I I LOCAL 1 ).

From the front panel, select ENT ADRS from 00 to 31, and [ HZ UV I (or any terminator)

The Signal Generator's internal switch address can also be changed using a procedure described in Section VIII of the Service Manual in Service Sheet 2. However, this address

will only be used when Power is turned from Standby to On if the internal battery power

is lost.

[ LOCAin ), followed by a data entry

WARNING

The setting of the switch that is described in Section VIII is intended for service-trained persons who are aware of the potential shock hazard of working on an instrument with protective covers removed.

System Control Setting the address from the front panel when the instrument is in its service mode will disable any activated HP-IB control capabilities. (Refer to the Service Manual for more information about configuring the Signal Generator as a system controller to perform various self-test and self-calibration routines.)

3-8

Model 8642A/B Operation

HP-IB CAPABILITIES

Overview The 8642A/B Signal Generator is designed to be compatible with a controller that

interfaces in terms of the 12 bus messages summarized in the HP-IB Capability Reference Table on page 3-10. The bus functions are discussed in more detail in the following text. The Signal Generator's complete capability (as defined by IEEE Standard

488 and the identical ANSI Standard MC1.1) is described at the bottom of Table 3-1 and

on page 1-2 under "HP-IB Capabilities".

HP-IB Capabilities In remote mode, all front-panel controls are disabled except the Power switch and the

Local key (the Local key can be disabled by configuring the instrument in Local Lockout). The Signal Generator will respond to each HP-IB message below according to its associated listen or talk address. (Each of these capabilities is described in more detail

on the pages that follow.)

Input Data. When addressed to listen (with REN true), the Signal Generator stops talking and can respond to input data. (Refer to page 3-11.)

Output Data. When addressed to talk, the Signal Generator stops listening and can send output data. (Refer to page 3-15.) Clear (Selected Device Clear, SDC). When addressed to listen (with REN true), the Signal Generator stops talking and responds to SDC by clearing any uncompleted entries or

messages. (Refer to page 3-24.)

Clear (Device Clear, DCL). Regardless of the addressed state of the Signal Generator

(whether addressed to listen or to talk), it stops talking and responds to DCL by clearing any uncompleted entries or messages. (Refer to page 3-24.)

Local. When addressed to listen (with REN true), the Signal Generator stops talking and responds to the Local command by returning from remote control to local control. (Refer to page 3-25.) Local Lockout. Regardless of the addressed staU )f the Signal Generator (whether addressed to listen or to talk), it responds to the Local Lockout command by disabling the

front-panel Local key. (Refer to page 3-26.) Clear Lockout and Set Local. Regardless of the addressed state of the Signal Generator (whether addressed to listen or to talk), it responds to the Clear Lockout and Set Local command by re-enabling the front-panel Local key and returning from remote control to local control. (Refer to page 3-26.) Require Service. Regardless of the addressed state "> the Signal Generator (whether addressed to listen or to talk), it can senc e Require Service message. (Refer to Service Request, page 3-27.) Status Byte. When addressed to talk, after receiving the Serial Poll Enable (SPE) bus command, the Signal Generator outputs the Status Byte. (Refer to page 3-29.) Abort. Regardless of the addressed state of the Signal Generator (whether addressed to listen or to talk), it responds to the Abort am" nd stops listening or talking. (Refer to page 3-31.)

HP-IB Capabilities from Local Mode

Besides having the above capabilities while '-emote, the following capabilities are also available from the local mode: © Require Service

• Status Byte

• Data (Output)

3-9

Operation

HP-IB Capabilities (cont'd)

Table 3-1. HP-IB Capability Reference Table

Model 8642A/B

HP-IB

Capability

Data

Trigger

Clear

Remote

Local

Lockout

Clear Lockout/ Set Local

Pass Control/

Take Control

Require Service

Status

Byte

Status

Bit

Abort

"Commands, Control lines

not

necessary

your controller's manual describes programming

Applicable

Yes

and

Interface Functions

Response

All front-panel functions, special functions, only functions

Rotation). message, LSTN

and TLK

when

the

The Signal Generator does

are

programmable (except Knob

The

Signal Generator

and

setting information.

annunciators turn

instrument

can

on as

addressed.

not

have a device trigger

The

capability. The Signal Generator responds equally

SDC

bus

commands.

The

Clear capability does

set instrument parameters. The Signal Generator's remote mode

the

REN bus

(i.e.,

the to listen. Signal Generator enters

panel

RMT

The Signal Generator returns when

it unchanged. Responds either or

the

work

if the

Local

Key is the controller Signal Generator

Generator returns longer true when

The Signal Generator cannot pass

HP-IB.

that

trol capability

line

keyboard

The

true. However,

active) until

output signal

the

remote mode.

annunciator turns

enters

the

local mode.

to the GTL bus

front-panel LOCAL

instrument

key. The

is in the

disabled during Local Lockout

or the

POWER switch

local.

local

and

the REN bus

However intended

does have limited control capability

for

servicing

accessed with Service Special

the

it is

unchanged when

when

front-panel control

The

Local Lockout State.

Local Lockout

lines goes false.

instrument. This

Functions. The Signal Generator sets

one

of the

enabled

following conditions exists

by the RQS

the SRQ bus

mask

send

the

that condition: Parameter Changed, Error, Ready,

Local/Remote, Execution Error, Hardware Error, End

Sweep.

The Signal Generator responds (SPE)

bus addressed Generator

Each

bit

command to

talk.

had

requires different conditions

sending

Bit 6 (RQS bit) is

sent

the

Require Service Message.

The Signal Generator does

not

to a

respond

poll.

The Signal Generator stops talking

are

defined

IEEE

Std 488 (and the

terms

of the

and

remote-

send status byte,

front-panel

appropriate

to DCL and

not re-

enabled when

remains

first addressed

the

The

front-

remote mode.

output signal

command

LOCAL

can

key

return

will

only

the

is no

take control

line true

and it has

message

Serial Poll Enable

8-bit

byte when

true

Signal

for

clearing.

to a

parallel

listening.

identical ANSI Standard MC1.1). Knowledge

twelve HP-IB Messages shown

local

not

con-

been

for

Commands

and Controls*

MLA

MTA

EOI

GET

DCL SDC

REN MLA

GTL

LLO

REN

ATN

IFC

SRQ

SPE SPD MTA

ATN

EOI

IFC

in the

left column.

Interface

Functions*

L3 AH1 SH1

DTO

DC1

RL1

C28

SR1

PPO

T6,

these might

3-10

Complete HP-IB capability

SHI,

AHl, T6, TEO, L3, LEO, SRI,

defined

IEEE

Std 488 (and the

RL1,

PPO, DCl, DTO, Cl, C2, C3, C28, E2.

identical ANSI Standard MCl.l)

is:

Model 8642A/B Operation

DATA INPUT

Overview Data can be input to the Signal Generator using either front-panel keystrokes or via

HP-IB.

To address the Signal Generator via HP-IB, the input data information usually contains

the universal unlisten command, the Signal Generator's listen address, the controller's talk

address, and a string of HP-IB program codes. The following Table 3-2, shows some possible Signal Generator settings and corresponding

HP BASIC commands.

Table 3-2. Data Input Example

input Data

Set frequency to 123.4 MHz Set amplitude to -10 dBm Set amplitude increment to 10dB,

decrement amplitude 20 dB

Examples assume: Signal Generator's address = 19

OUTPUT 719; "FR 123.4 MZ" OUTPUT 719; "AP -10 DM" OUTPUT 719; "APIS 10 DB APDN APDN"

HP BASIC

Refer to your controller manual for command syntax and the controller's address.

Program Codes The Signal Generator's functions can be accessed with specific program codes. These

program codes are summarized in HP-IB Codes Summary in Table 3-8, Signal Generator Function to HP-IB Code (page 3-32), and Table 3-9, Signal Generator HP-IB Code to Function (page 3-33). In addition, most HP-IB codes are printed on the instrument's front panel, in light gray print, near the code's associated key.

Input Syntax Input data information consists of one or more bytes sent over the bus' eight data lines

when the bus' attention control line [ATN] is false, and when the Signal Generator is remote and addressed to listen with the REN line true (low). The Signal Generator processes ASCII characters individually as they are received and performs the function specified as soon as a recognizable sequence of characters has been received.

Accessing the Signal Generator's front-panel key functions via HP-IB is equivalent to accessing them from the front-panel. Table 3-3, on the following page, compares some local keystroke sequences and their corresponding HP-IB code sequences. (Direct access to the shift functions is possible from HP-IB so the Shift key is not used in HP-IB coding.)

3-11

Operation Model 8642A/B

Data

input (cont'd)

Table 3-3. Relationship Between Keystrokes and Hi -IB Code Sequences

Function

set a 1 MHz

output frequency

set an RF frequency of

1 MHz

select Special Function

reference

111

Front-Panel Keystroke Sequence

[

™>

I I 1 ] [ T

p^T] REF SET ( (SHIFT ] (

SPCL(L^T_J[^J)LJJ

FREQ

[ 1 I (JU

|) | 1 j [ T )

^iljfllj^

1 MZ

FRRS

Sequence

1 MZ

111

Sequence Dependency Some functions in the 8642A/B are coupled together because of internal circuit

configuration limitations. This coupling can limit the execution of a setting when one function limits the setting of the other.

For example, amplitude and AM depth are coupled functions; An AM depth of 99.0% is

possible only when the amplitude setting is between -140.0 and +14.0 dBm. Therefore,

changing this setting: Amplitude = +14 dBm,

AM depth = 99%

to this setting: Amplitude = +15 dBm

AM depth =

7 5%

would not be possible if the amplitude entry was attempted before the AM setting. AM could be changed first to achieve the setting, but setting AM first would not always be successful. For example, if you were changing back to the first example (to an amplitude of +14 dBm and AM depth of 99%), setting the AM first would not set the requested AM setting. (To eliminate this sequence dependency problem when setting AM or amplitude, first turn off AM, then set the amplitude, then set the AM depth.)

How to Avoid Sequence Dependency Problems The Detailed Operating Instructions in this Operating Manual describe the limitations of specific coupled functions and will help you avoid entering incorrect sequences. Also, when operating locally, displayed Execution Error messages direct you to your entry error. However, if operating via HP-IB, it might be inconvenient to rely either on the manual or on error messages for every combination of settings. Flowcharts of Sequence Dependency, on the following page, can assist in the development of driver subprograms to eliminate

the consequences of sequence dependency. If you follow the flowcharts and still cannot

obtain the requrested setting, that setting is probably not possible.

3-12

Model 8642A/B

When setting

one

the

following,

use the

Operation

^!IJ|:^

appropriate flowchart:

AP AM AMOF

SP9 SP209

CSTART}

zzizr

AMOF

SP9

OESIRED

ALREADY CONFIGURED

THE DESIRED 'HELD ATTENUATOR RANGE?

pio

AP DATA, UNITS

DESIRE

SP9 X

FOR

THIS

AP SETTINQ?

YES

SP9

AND

FDR

AVE

FM FMOF FR FM Source MF

source

FMNT, FMXA,

SP6

SP206

V SP8 SP208 SP205 SP212

YES

SP6

is:

SP112

STARTJ

FMOF

SP206

DESIRE

SELEcT

MODULATION

SOURCE

DESIRE

YES

SP8

ON?

\NO

SP208

PM PMOF FR PM Source

( START

}

PMOF

DESIRE

PM ON?

YES

SELECT

MODULATION

SOURCE

FR DATA, UNITS

DESIRE

PM ON?

YES

■

PM DATA, UNITS

DESIRE SP6?

DESIRE

'FM Modulation Sources include: FMNT, FMXA, FMXD, FMBA, FMBD,

2*M Modulation Sources include: PMNT, PMXA, PMXD, PMBA, PMBD.

AM ON?

YES

AM DATA, UNITS

( FINISHED

)

IS F» / MODULATION SOURCE \ FMNT, FH8A.

SA_ih

MF DATA, UNITS

FR DATA, UNITS

S.NO

( DESIRE

FM DATA, UNITS

FINISHED

YES

SP6

DESIRED HITH

OR g

I YES

FM ON?

|YES

SP5,

SP112.

OF V"

V-

■

( FINISHED

}

Figure 3-3. Flowcharts for Sequence Dependency

3-13

Operation Model 8642A/B

Data Input (cont'd)

Exceptions to Flowcharts Not covered in those flowcharts is frequency sweep's dependence on entry sequence. Frequency sweeps are coupled to FM and $M settings. When selecting either Digitally Stepped Frequency Sweep or Phase Continuous Frequency Sweep with either FM or $M, use the following sequence:

Turn off frequency sweep (FAOF FBOF).

Select either Special Function 123 (Phase Continuous Frequency Sweep) or

Special Function 223 (Phase Continuous Frequency Sweep Off which enables the selection of Digitally Stepped Frequency Sweep).

If FM is to be selected, use the FM flow chart (but don't set FM yet, nor FR).

If 4>M is to be selected, use the <t>M flow chart (but don't set PM yet, nor FR).

With Start Frequency (FA) or Stop Frequency (FB) active, select the sweep

mode (FASA for auto, FASM for manual, or FASG for single).

6. Select the sweep time setting.

Select either the start or stop frequency setting. (Choose the frequency setting

that is in the band that allows the desired FM or 4>M setting.)

8. Select the desired FM or $M deviation setting.

9. Select either the stop or start frequency setting (whichever of these which was not set in step 7.)

Valid Character Entry When entering data over HP-IB, the data entry can take the form of:

Implicit point notation (for example, 100 MZ), or Fixed point notation (for example, 100.0 MZ), or Exponential notation (for example, 1000E-1 MZ).

Each function has an HP-IB data-entry limit of 10 mantissa digits and 2 exponential digits (exponential notation is optional). For example, the following entries for 100 MHz will be accepted:

1000000000E-01 HZ 1000000000E-1 HZ 1000000000E-4KZ

However, these entries for 100 MHz will not be accepted:

1OOOOOOOOOOE-02 HZ (this entry will be accepted as 10 MHz) 100000000E-006 MZ (this entry won't be accepted and could cause problems in

subsequent data entries)

Only the following data inputs are recognized over HP-IB by the Signal Generator; all other characters are ignored: A-Z,

a-z (lower-case letters are converted to upper case)

0-9

+ -

3-14

Leading zeroes are treated as significant digits.

The space character, carriage return, and line feed are ignored.

rev.!20CT87

Model 8642A/B Operation

DATA OUTPUT

Overview The Signal Generator can send the following data messages when it is addressed to talk:

Status Byte (refer to Status Byte on page 3-29) Messages (discussed below)

Display Information (dib. .ssed below" Service Messages (refer to Section information)

The Signal Generator can output the following messages and display information (normally viewed on the front-panel display) using HP-IB codes that do not have

equivalent front-panel k. ys. ihe HP-IB codes are in parenthesis after each message listed below: Output Messages

Hardware Errors (OH) Execution Errors (OE)

Parameters Changed Messages (OC) Output Active Function (OA) Output HI, I.O Status (OL) Output Display (Output Display is the default HP-IB output when nothing else is

configured for data output; it does not require an HP-IB code to output data.)

•• 111

ihe Service Manual for specific Service Message

3-15

Operation Model 8642A/B

Data Output (cont'd)

Output

Messages

Hardware Errors (OH)

These messages signal the presence of either an internal circuit hardware problem or a firmware problem. (Refer to Messages, page 3-177, for more information about these messages; each message code is prefixed with the letter "H" in the listing in that section.

The presence of one or more of these messages is signaled when bit 1 of the Status Byte is set. (Refer to Status Byte on page 3-29.) Some service-related messages can also cause this bit to be set. (Refer to the Service Manual.)

Execution Errors (OE)

These messages describe the Signal Generator's reason for not executing an attempted setting. (Refer to Messages, page 3-177, for more information about these messages; each message code is prefixed with the letter "E" in that listing.)

The presence of one of these messages is signaled when bit 2 of the Status Byte is set. (Refer to Status Byte on page 3-29.) Some service-related messages can also cause this bit to be set. (Refer to the Service Manual.)

Parameters Changed Messages (OC)

These messages inform you that the Signal Generator has changed some other setting to allow a new setting. Some of the Signal Generator's functions cannot occur simultaneously with other functions, so the Signal Generator will automatically adjust or turn off the functions that are preventing the new setting. For example, AM is turned off when pulse modulation is selected; the Output Parameters Changed Message is "AM TURNED OFF .Cl 1". (Refer to Messages, page 3-177, for more information about these messages; each message code is prefixed with the letter "C" in that listing.)

The presence of this message is signaled when bit 7 of the Status Byte is set. (Refer to Status Byte on page 3-29.) Some service-related messages can also cause this bit to be set. (Refer to the Service Manual.)

Examples

The Signal Generator can output either the message code number or the message string

(the alphanumeric display) for any of the above messages. Table 3-6, Error Code and

Message Recovery Example Program (on page 3-23), provides some sample subprograms

that detail a way to retrieve the Signal Generator's messages.

Execution Errors and Parameters Changed Messages

After it receives "OE" or "OC" and is addressed to talk the first time, the Signal Generator will output the message code number. The second time it is addressed to talk, the Signal

Generator will output the message string.

3-16

You can read only the first Execution Error message if more than one of these has occurred since either the Status Byte was cleared or since the last time "OE" was executed. Then reading a message using "OE" will enable you to read out only the first Execution Error message.

Model 8642A/B Operation

You can read only the first Parameters Changed message if more than one of each of these has occurred since either the Status Byte was cleared or since the last time "OC" was executed. Then reading a message using "OC" wil' enable you to read out only the first Parameters Changed message.

Following is a programming example in BASIC for outputting an Execution Error (OE): Output either an Execution Error code number or message string from the Signal Generator (address 19) and reset bit 2 of the Status Byte:

To output the message code number:

10 OUTPUT 719; "OE"

20 ENTER 719; A

To output the message string:

10 OUTPUT 719; "OE" 20 ENTER 719; A ! Dummy read of the message code number 30 ENTER 719; A$

The above examples can also oe modified to apply to an Output Parameters Changed (OC) message if you send "OC" instead of "OE". Sending either "OE" or "OC" alone (program line

10 above) will reset the appropriate status bit (unless RQS is true, in which case the Status

Byte must be read again to clear the status bit"

Note that you should not execute an instrument function between setting up the instrument for data output and reading the data from the Signal Generator. To illustrate this consideration, refer to the "OE" example above. If you were to insert a line 15 that set an instrument function such as AM, the data received from the Signal Generator will be the display data, not the Execution Error message code, because "AM" would have superceded the "OE" data output preparation.

Hardware Errors

Hardware Error messages are handled differently than Execution Error or Parameters Changed messages since more than one message can be present. These messages are stored as a queued up list with a maximum number of 22 messages. (Read about queued up messages on page 3-180). To properly retrieve all the queued up messages, follow the "OH" command with a software loop as shown in the sample program in Table 3-6 (page

3-23).

3-17

Operation Model 8642A/B

Data Output (cont'd)

Output

Active Function (OA) Output Active Function enables the Signal Generator to output the setting of a selected

active function over HP-IB. The Signal Generator outputs a string that can be directly read into a numeric variable or into a string variable which includes the HP-IB codes for both the function and its units specifier (maximum of 19 characters).

Following is a programming example in BASIC for outputting the active function (OA): Output the RF frequency setting as either a numeric value or a string from the Signal Generator (address 19). ("OA" should be preceded by the function's HP-IB code.)

To output the numeric value:

10 OUTPUT 719; "FROA"

20 ENTER 719; V ! Value is output in Hz

To output the alphanumeric character string:

10 OUTPUT 719; "FROA" 20 ENTER 719; AS

The functions and values that can be output over HP-IB using "OA" are listed below along with some format parameters.

Meanings of Values That Could Be Output

-200 indicates the function is off.

-201 indicates RF.OFF. (for amplitude only).

-202 indicates reverse power is tripped (for amplitude only).

A space character is placed before and after the numeric portion of the string.

Output String Formats Table 3-4, Output Active Function String Formats (on the following page), lists the output format for each active function string. The meanings of symbols in Table 3-4 are as follows. s = sign character, either "+" or "-" d = digit (Leading zero digits greater that the one's digit are suppressed.)

Comments If a function's value is in relative units, the displayed, relative setting (not the absolute setting) will be output. You can output absolute units by converting from relative units to absolute units before outputting the active function. Refer to page 3-205 for amplitude units conversion information.

"OA" can be sent without a function prefix. The first two characters in the output string will designate the active function. If the Signal Generator does not have an active function when it receives "OA" without a function prefix, it will output the display string (which is the default HP-IB output).

3-18

Model 8642A/B

Operation

Table 3-4. Output Active Function String Formats

Function

Frequency (Value could be negative if Frequency is relative)

Amplitude

(in dBm)

(in dB relative, dB EMF relative, dB,uV, or dB EMF MV)

(in volts or EMF volts) AM FM *M Modulation Frequency Modulation Output Level Start Frequency Stop Frequency Start Amplitude

(in dBm)

(in volts or EMF volts) Stop Amplitude

(in dBm)

(in volts or EMF volts) Sweep Time

String Format

FR sdddddddddd.O HZ

AP sddd.d DM

AP sddd.d DB

AP +d.ddddddddd VL AM +dd.d PC

FM +ddddddd.O HZ PM +ddd.dddddd RD MF +dddddd.d HZ ML +d.dddd VL FA +dddddddddd.O HZ FB +dddddddddd.O HZ

AA sddd.d DM AA +d.ddddddddd VL

AB sddd.d DM AB +d.ddddddddd VL

ST +ddd.ddd SC

Leading zero digits greater than th

i one's digit are suppressed.

3-19

Operation Model 8642A/B

Data Output (cont'd)

Output HI,

Status (OL) Output HI, LO status enables an HP-IB Controller to monitor the level of the external

modulation signal by configuring the Signal Generator to output the status of the HI, LO annuciators for AM, FM, or $M. The status can be read as either a numeric value or as a string that represents the HI and LO annunciators.

Annunciator

neither HI nor LO

Numeric Value Representation +

-1 0

String Representation

HI LO OK

Following is a programming example in BASIC for outputting HI, LO status (OL): Output from the Signal Generator (address 19) the status of its HI, LO annunciators for an external, ac-coupled AM signal.

To output the numeric value:

10 OUTPUT 719; "AMOL" 20 ENTER 719; V

To output the string:

10 OUTPUT 20 ENTER

30 ENTER

719; 719; 719;

"AMOL" V A$

! Dummy read of the numeric value

3-20

Model 8642A/B

Output Display Information

The Signal Generator will output the display information when it is addressed to talk and

is not configured to output any other data.

Each item in the sequence above will be output again in the same sequence when the Signal Generator is further addressed to talk.

Following is a programming example in BASIC for outputting display information: Output the current display of the Signal Generator (address 19), including the cursor position and annunciators. (Assuming a function was executed to enable you to get the display you want.)

Operation

The first time the Signal Generator is addressed to talk, it will output the actual

display in alphanumeric characters (maximum of 74 characters). (The string length of the alphanumeric display will always be greater than or equal to 25 characters.)

The second time the Signal Generator is addressed to talk, it will output a number,

representing the displayed cursor positions, in a binary, weighted sum. (This string length will always be less than 25 characters.)

The third time the Signal Generator is addressed to talk, it will output a number,

representing the displayed annunciators, in a binary, weighted sum. (This string length will also always be less than 25 characters.)

10 DIM AS [74] 20 ENTER 719; A $ 30 ENTER 719; C 40 ENTER 719; N

The Signal Generator is initialized to output the alphanumeric display string first, whenever you execute an instrument function (for example, set AM or frequency). (When you are using Output Display to output messages, the actual front-panel display will be output, not the message code number that would be output if you used "OC", "OE", or "OH".)

The binary weight of the cursor positions are:

2*=2 for the left most cursor 2 =4 for the next cursor to the right. 2 =8 for the next cursor to the right, ..., 2n for the nth cursor position from the left, ..., 2= 33 554 432 for the right most cursor.

The binary weight of the annunciators are provided in the following Table 3-5.

Define string big enough to handle maximum display Display String Cursor Value Annunciator Value

rev. 2 OMAR 8 5

3-21

Operation

Data Output (cont'd)

Table 3-5. Output Display; Binary Weight of Annunciators

Model 8642A/B

Annunciator

RMT LSTN START

(Frequency) TLK SRQ

FREQ REL

(Frequency)

EMF

SPCL

SWPNG HI LO

START

(Amplitude) INT EXT

AMPTD

REL

(Amplitude) STOP MSSG

Weighting

2°

Decimal

1 2 4

128 256 512

1 024 2 048 4 096 8 192

16 384

32 768 65 536

131 072 262 144 524 288

1 048 576 2 097 152

4 194 304 8 388 608

3-22

Example

With a display of:

1 KJ

■w

FREQ

AMPTD

Alphanumeric characters output will be:

100.000000MZ -140.0DM

Cursor value output (4th cursor from the left) will be:

24 = 16

Annunciator value output for FREQ and AMPTD will be:

25+220=

32+1048 576=1048 608

Outputting the display could be used to output the currently selected special functions, or to output the annunciator value to determine the current modulation source.

Table 3-6. Error Code and Message Recovery Example Program

rev.20MAR85

Model 8642A/B

10 20 30 40 50 60 70 80 90

100

110

120

130 140 150 160

170 180 190 200 210

220 230 240 250 260 270 280 290 300 310

320 330 340 350 360 370

380 390 400 410 420

430

440 450 460 470 480 490 500 510 520 530 540 550 560 570 580 590

600 610 620 630 640

650 660 670 680 690 700 710 720 730 740 750 760

Table 3-6. Error Code and Message Recovery Example Program

ERROR CODE AND MESSAGE RECOVERY EXAMPLE PROGRAM

JWT JULY 1984 EDIT DATE 23 AUG 1984

LET Gen=719

COM /Gen.addr/ Gen

DIM Mssg$[74J

ENABLE INTR 7;2 ON INTR 7 CALL Get.message OUTPUT Gen;"RM134HZ"

CALL User.program

END

SUB PROGRAMM TO POLL THE 8642 AND PRINT THE MESSAGE CODES

Get-message:

ENABLE INTR 7

Execution: SUB Execution

Change: SUB Change

Hardware: SUB Hardware

COM /Gen.addr/ Gen OUTPUT Gen;"OC" ENTER Gen;Mssg.code PRINT USING 560;Mssg.code

IMAGE "CHANGE CODE =",K ENTER Gen;Mssg$[1,74] PRINT Mssg$[1,74] SUBEND

! COM /Gen.addr/ Gen

OUTPUT Gen;"OH"

ENTER Gen;Mssg.code

IF Mssg.codeoO THEN 690

ENTER Gen;Mssg.code

PRINT "NO HARDWARE MESSAGE FOUND" GOTO 760 PRINT "MESSAGE CODE =";Mssg.code ENTER Gen;Mssg.code

IF Mssg.codeoO THEN 690

ENTER Gen;Mssg$[1,743 PRINT Mssg$[1,74]

IF Mssg$[1,19]="END OF MESSAGE LIST" THEN

GOTO 720 SUBEND

SUB Get.message COM /Gen.addr/ Gen LET Byte=SPOLL(Gen)

IF BIT(Byte,2) THEN CALL Execution IF BIT(Byte,7) THEN CALL Change IF BIT(Byte,1) THEN CALL Hardware

SUBEND

COM /Gen.addr/ Gen OUTPUT Gen;"OE"

ENTER Gen;Mssg.code PRINT USING 460;Mssg_code

IMAGE "EXECUTION ERROR CODE

ENTER Gen;Mssg$[1,74] PRINT Mssg$[1,74] SUBEND

= ",K

! DEFINE 8642 ADDRESS

! COMMON AREA TO STORE

GEN ADDRESS FOR SUB'S

! DIMENSION SPACE TO

ENTER IN MESSAGES

READ STATUS BYTE CHECK MESSAGE BIT CHECK MESSAGE BIT CHECK MESSAGE BIT

OUTPUT"OE"COMMAND

READ MESSAGE CODE

PRINT MESSAGE CODE

! READ MESSAGE ! PRINT MESSAGE

OUTPUT"OC"COMMAND READ MESSAGE CODE PRINT MESSAGE CODE

! READ MESSAGE ! PRINT MESSAGE

OUTPUT"OH"COMMAND READ MESSAGE CODE CHECK IF CODE =0 READ MESSAGE CODE PRINT NO MESSAGES

! PRINT MESSAGE CODE

READ MESSAGE CODE CHECK IF LAST READ MESSAGE PRINT MESSAGE

760 ! LAST MESSAGE ?

! GO FOR NEXT MSGE

Operation

Model 8642A/B

CLEAR

The Signal Generator responds identically to Selected Device Clear (SDC) and Device Clear (DCL) bus commands by clearing any message or uncompleted entries. For example, a command of FR100 would be cleared because no units terminator has been specified.

Also,

with the Clear command, Clear Status Byte occurs, possibly clearing up to 6 status

bits.

The Clear command does not affect instrument settings. However, selecting Instrument Preset (IP), Partial Preset (PP), or turning the Power from Standby to On, will reset instrument settings as described in the Detailed Operating Instruction, Instrument Preset, Partial Preset (page 3-137.)

Model 8642A/B Operation

REMOTE, LOCAL

Local to Remote Transition The Signal Generator goes remote when it receives the Remote message. The Remote

message has two parts:

Remote Enable bus control line (REN) set true.

Device listen address received once (while REN is true).

The Signal Generator's output signal and all control settings remain unchanged with the local to remote transition, but any uncompleted messages (non-terminated partial entries) are cleared.

LOCAL Remote to Local Transition The Local message is the way the controller sends the Go To Local (GTL) bus command.

The Signal Generator returns to local control when it receives the Local or Clear Lockout/Set Local message. The Signal Generator also returns to the local mode when the front-panel 1 LOCAL 1 key is pressed (provided Local Lockout is not in effect). If the instrument is not in local lockout mode, pressing the front-panel I LOCAL \ key could interrupt a data transmission ana suspend the Signal Generator in an unknown state. (Refer to Local Lockout, Set Local on the following page for more information on the Local Lockout function.)

3-25

Operation Model 8642A/B

LOCAL

Local Lockout The Local Lockout message is the way the controller sends the Local Lockout (LLO) bus

command. The Signal Generator responds to the Local Lockout message by disabling the front-panel [ LOCAL I key.

Clear Lockout/ Set Local The Clear Lockout/Set Local message is the way the controller sets the Remote Enable

(REN) bus control line false. The Signal Generator returns to local mode when it receives the Clear Lockout/Set Local message. No instrument settings are changed by the transition from remote to local.

When in local lockout, the Signal Generator can be returned to local only by the controller (using the Local or Clear Lockout/Set Local messages), or by setting the Power switch to Standby and back to on, or by removing the bus cable.

Return-to-local while in local lockout can be accomplished by switching the I POWER I from STBY to ON. Returning to local control in this way has the following disadvantages:

LOCKOUT,

NOTE

SET LOCAL

It defeats the purpose and advantages of local lockout (that is, the

system controller will lose control of a system element).

Instrument configuration is reset to the power-up conditions listed in

the Detailed Operating Instruction, Instrument Preset, Partial Preset (page 3-1 37).

3-26

Model 8642A/B

Operation

SERVICE REQUEST

Overview The Signal Generator uses its internal Status Byte and a Request Service Mask Byte (RQS

mask that you set) to determine whether to issue a Service Request (SRQ bus line true).

RQS MASK The RQS mask is an

will be allowed to cause a service request. (See Figure 3-4 on the following page.) Bits 0 through 5 and 7 of the Status Byte are logically ANDed with bits 0 through 5 and 7 of

the RQS mask byte. If the resultant value is not equal to zero, the Signal Generator sets

bit 6 of the Status Byte true, which sends a Service Request (SRQ) message to the system

controller (SRQ bus line true).

At turn-on or instrument preset, the RQS mask byte is set to zero, effectively disabling or masking all the status bits from causing a service request message.

Changing the 8-bit RQS Mask Byte

• l-rom the Remote Mode: Send RM, the decimal equivalent of the binary and the terminator, HZ.

• From the Local Mode: Select RQS MASK ( I SHIFT I [ INT I ), the decimal equivalent of the binary and any terminator (such as [HZ UV 1 ).

Example

Enable status bits 0 (End of Sweep), 1 (Hardware Error), and 7 (Parameters Changed) to cause a service request (SRQ bus line true) by unmasking those bits; that is, set the Signal Generator's RQS mask to binary 1 000001 1 (decimal 131).

Set the mask value to:

Local operation: Remote operation:

8-bit

byte that you can set to define which bits of the Status Byte

8-bit

byte (a number between 0 and 255),

binary 10000011 = decimal 131 RQS MASK ( ( 5HIFT I QNT RM 131 HZ

CD m CD i HZ uv I

8-bit

byte

A Service Request can be generated in either the local or remote mode. To determine which status bit caused the service request, refer to Table 3-7, HP-IB Status Byte Bit Definitions, on page 3-30. The Status Byte can be read only by doing a serial poll via HP-IB (refer to page 3-29).

Clearing the Service Request Message The Service Request message can be cleared by masking the "set" bits in the Status Byte

using the RQS mask. If the condition which caused SRQ to be pulled has been resolved, the Service Request message can be cleared 'vith any of the following actions for clearing the Status Byte:

Sending Clear Status (CS).

Sending Instrument Preset (IP).

Sending Device Clear or Selected Device Clear.

Switching Power from Standby to On. Resetting the individual "set" bits. (Refer to Table 3-7 on page 3-30.)

3-27

Operation Model 8642A/B

CONDITIONS

STATUS BYT

BIT

WEIGHT

RQS MASK*

(DEFAULT

VALUE)

BIT

WEIGHT

PARAMETER

CHANGED

: '

128

0 ^^

^^ 1

(0)

fill

1 1 1

^-^

^^ 1

(0)

RQS

ERROR

1 r u

" i' " "

0 ^^

^^ 1

(0) (0) (0) (0)

READY

, , ,

0 ^^

^^ 1

LOCAL/ REMOTE

3 8

0 ^^

^^ 1

EXECUTION

ERROR

2 4

0 ^^

^^ 1

HARDWARE

ERROR

0 ^^

(0)

END OF

SWEEP

0 ^^

^^ 1

(0)

SERVICE

REQUEST

MESSAGE

SRQ

*BIT 6 OF THE RQS MASK DOES NOT ENABLE ANY C THUS,

IT CAN BE TRUE OR FALSE AND NOT AFFECT

TURN-ON DEFAULT VALUE FOR THE MASK IS BINARY

(DECIMAL 0).

Figure 3-4. The Status Byte and RQS Mask

ONDITION.

RQS. 00000000

3-28

Model 8642A/B

Operation

STATUS BYTE

Overview

Reading the Status Byte

The 8642A/B Status Byte consists of one status.

All 8 status bits are updated whether the Signal Generator is in local or remote

mode.

Each bit of the Status Byte monitors a particular aspect of the Signal Generator's operation. Table 3-7, HP-IB Status Byte Bit Definitions (on the following page), details the operating conditions which are monitored by the 8642 Status Byte.

The Status Byte can either be used to cause a Service Request or simply be read to monitor the Signal Generator's operating status.

To read the Signal Generator's Status Byte, the controller must send the Serial Poll Enable bus command and address the Signal Generator to talk. For example:

Program Statement (in BASIC)

10 S = SPOLL (719)

If the RQS bit is not set, the Status Byte will reflect the current status of the instrument.

If the RQS bit is set, the Status Byte will reflect the status of the instrument when the RQS bit was first set (or when the Status Byte was last read with RQS set). To actually get the current status of the instrument, the Status Byte should be read again. Note that the act of reading the Status Byte (alone) does not clear any status bits.

8-bit

byte which reflects Signal Generator

Clearing the Status Byte

If the instrument does not have an unresolved hardware error, the Status Byte will be "cleared" by executing any of the following:

Sending Clear Status (CS). Sending Instrument Preset (IP). Sending Device Clear or Selected Device Clear.

Switching the Power from Standby to On.

You can also clear the Status Byte by clearing the individual status bits. Refer to Table

3-7 on the following page.

NOTE

Bits 3 (Local/Remote) and 4 (Ready) are not affected by "clearing" the Status Byte. They always output their actual values.

3-29

Operation

^!IJ|;fr

Status Byte (cont'd)

Table 3-7. HP-IB Status Byte Bit Definitions

Model 8642A/B

Bit

HP-IB Operating

Condition

END OF SWEEP

HARDWARE ERROR

EXECUTION ERROR

LOCAL/REMOTE

READY

ERROR RQS (IEEE-488)

Condition

Single sweep finished.

Instrument out-of-lock, reverse-power tripped, or instrument firmware malfunction.

Syntax or function execution error.

Instrument in local

operation.

Typically always set.

Logical OR of bits 1 and 2. RQS mask is ANDed with

the Status Byte and the result is not equal to 0 (refer to Service Request for more information).

Comments

Reset with auto, manual, or a new single sweep, or sweep mode

Reset with an Output Hardware Error message to the 8642A/B (HP-IB program code "OH").1'2 More than one Hardware Error message may be present. After "OH" is executed, one error message code or string is output with each address to talk. (The Detailed Operating Instruction, Messages, lists the error codes with their respective messages.) To properly retrieve all Hardware Error information, refer to the example program in Data Output in this HP-IB information section.

Reset with an Output Execution error message to the 8642A/B (HP-IB program code "OE").12 Error code that caused bit to be set can be determined by reading the Output Execution Error code or string. Refer to the example program in Data Output in this HP-IB information section.

Reset when remote. Can be used to detect a front-

panel SRQ (emulated by selecting the LOCAL key if

not in Local Lockout). The Status Byte must actually be read with this bit set

for the instrument to have completed the processor

delay time part of the setting change which might not

include the analog settling time.

Reset when bits 1 and 2 are reset.

Reset when the RQS mask ANDed with the Status

Byte (ignoring bit 6) equals 0.

off.1'

PARAMETER CHANGED

reset with IP, CS, Device Cle

AISC

lf th

at bit was causing SRQ to be

erro

r because the error is cleared

3-30

Previous setting has been automatically changed; for example, FM is turned off when 3>M becomes active.

ar, Selected Device Clear, Power On. Dulled,

you must also read the Status E

only after the reading.)

Reset with an output Parameter Changed message (HP-IB program code "OC").

1,2

Parameter that was changed can be determined by transmitting the Output Parameter Changed message code or string. Refer to the example program in Data Output in this HP-IB information section.

Bit 1 is cleared only if all hardware errors are resolved.)

3yte again to actually reset that bit. (This second reading will still show the

Model 8642A/B Operation

ADDITIONAL HP-IB INFORMATION

Abort

Abort abruptly terminates all listener/talker activity on the interface bus, using the Interface Clear (IFC) bus line, and prepares all instruments to receive a new command from the controller. Typically this is an initialization command used to place the bus in a known starting condition. The Signal Generator stops talking or listening when it receives the Abort message.

Trigger

The Signal Generator does not respond to the Trigger message.

Status Bit

The Signal Generator does not implement parallel poll operations and therefore cannot send a Status Bit message.

Controller Capabilities; Self Test and Calibration

The Signal Generator can be configured as a syF*"rr controller to perform various self-test and self-calibration routines with a system voltmeter and the HP 8902A Measuring Receiver (and an optional

printer). Refer to Section IV in the Service Manual for a detailed description of these routines.

Display Control Via HP-IB

Selecting the [ SHIFT I key twice when in the local mode will display the instrument settings last selected. In the remote mode, you can send SHSH to achieve this same effect. (This may be useful when outputting display information.)

Remote Indicators The Signal Generator displays HP-IB annunciators to indicate its current HP-IB status: RMT When remote operation is selected LSTN When addressed to listen TLK When addressed to talk SRQ When pulling the SRQ line (with the RQS bit set in the Status Byte)

Disabling the Listen Addressed State

The Signal Generator remains addressed to listen until: It is addressed to talk, It receives an abort message, It receives a universal unlisten command, or Until the Power is switched from Standby to On.

Disabling the Talk Addressed State

The Signal Generator remains addressed to talk until: It is addressed to listen, It receives an abort message, It receives some other device's talk andress, It receives a universal untalk command, or Until the Power is switched from Standby to On,

3-31

Operation

Parameter

Frequency

Frequency Start Frequency (Sweep) Stop Frequency (Sweep)

Table

HPHB CODES SUMMARY

3-8.

Signal Generator Function

Code

Page

3-39 3-49

3-49

Units (Cont'd)

radian second millisecond

Parameter

HP-IB Code

Code

RD SC MS

Model 8642A/B

Page

3-119 3-52,

3-85

3-52,

3-85

Amplitude

Amplitude Start Amplitude (Sweep)

Stop Amplitude (Sweep) EMF Mode

Modulation

AM Depth

FM Deviation

$M Deviation

Pulse

Modulation Oscillator

Modulation Frequency Modulation Output Level

Modulation Source

Internal External External

Internal + External Internal + External

AC DC

Data

Numerals

0-9 Decimal point Back Space

Units

dBm dB Volt

dB^V

GHz MHz

kHz

Active function code.

Function should

These codes will sometimes

SM.

preceded

not

AP AA AB

EMON,

EMOF

AM FM PM

PLON,

PLOF

MF ML

NT XA XD

0-9

or DB

or DM

UV DU GZ

KZ HZ PC

an active functic

need

to be

1 1 1

1 1

precf

3-69 3-83 3-83 3-71

3-97 3-105 3-119 3-127

3-131 3-131

3-95 3-95 3-95 3-95 3-95

3-97

>n code. sded

by an

Sweep

Sweep Time Auto Sweep

Manual Sweep

Single Sweep

Relative

Reference

Set Relative Zero Relative

Off

Other

Instrument Preset Partial Preset

Special Function

Message

Output Hardware Error Output Execution Error

Output Parameters

Changed

Output Active Function

Write Service Request Mask

Output HI.LO

Annunciator Status Clear Status Byte Step

Up Step Down Increment Knob, Knob,

Set cursor left cursor right

Knob Hold Knob Increment

Help Help

Off RF Off/On Off,

Entry

Off Sequence Set Sequence Save

Recall

For

example, internal modulation source

active function code;

for

example, when using

for AM is

RS RZ

OH OE

KHON2,

KHOF

R0,

OF2, ON

EO SQ

SS SV RC

coded

DN witt-

2 2 2

2,3

AMN

3-52,

3-85

3-51,

3-84

3-51,

3-84

3-51,

3-84

3-46,

3-78

3-45,

3-77

3-47,

3-81

3-138 3-139 3-167 3-179 3-17,

3-193

3-16,

3-184

3-16,

3-182 3-18 3-27

3-20 3-29 3-149 3-149 3-149 3-141 3-141 3-143

3-142 3-167 3-167 3-72

3-153

3-161 3-161 3-157 3-159

SV, RC, HP,

3-32

Model 8642A/B Operation

Table 3-9. Signal Generator HP-IB Code to Function

Code

BS CS DB

EMON,

EMOF

GZ HO HP HZ

KHON2,

KHOF

MS MV MZ

Active funct

Function sh

These code

Parameter

Start Amplitude (Sweep) Stop Amplitude (Sweep) AM Depth Amplitude Internal + External AC Internal + External DC Back Space Clear Status Byte dB or dBm

dBm or dB

Step Down

dBMV

EMF Mode Entry Off Start Frequency (Sweep) Stop Frequency (Sweep) FM Deviation Frequency GHz Help Off Help Hz Instrument Preset Increment Set

Knob Hold Knob Increment Knob,

cursor left

Knob,

cursor right kHz Modulation Frequency

Message

Modulation Output Level millisecond mV MHz

on code. Duld be preceded by an active funct 5 will sometimes not need to be pre

Page

3-83 3-83 3-97 3-69 3-95 3-95

3-29

Code

OC OE

OF2,

3-149

3-71 3-153 3-49 3-49 3-105 3-39

3-167 3-167

3-138 3-149

PLON,

PLOF

R0,R1

RC RD

SP 3-143 3-142 3-141 3-141

3-131 3-179 3-131

3-52, 3-85

VL XA XD

0-9

on code. For example, internal modulat ceded by an active function code; for e

Parameter

Internal Output Active Function Output Parameters Changed Output Execution Error

Off, On Output Hardware Error Output HI,LO

Annunciator Status

Pulse *M Deviation

Partial Preset RF Off/On Recall radian

Relative Off Write Service Request Mask Reference Set Relative Zero Auto Sweep second Single Sweep

Manual Sweep Special Function Sequence Set Sequence

Sweep Time

Save Step Up

Volt

External AC

External DC

Numerals 0-9

Decimal point

ion source for AM is coded AMNT. xample, when using UP or DN with SV,

Page

3-95 3-18 3-16, 3-182 3-16, 3-184

3-17, 3-193 3-20

3-97

3-127 3-119 3-139 3-72 3-159 3-119 3-47, 3-81 3-27

3-46, 3-78

3-45, 3-77 3-51,

3-84 3-52, 3-85 3-51,

3-84 3-51,

3-84 3-167 3-161 3-161 3-52, 3-85 3-157 3-149

3-95 3-95

RC,

HP, or SM.

3-33

Operation Model 8642A/B

HP-IB RELATED FRONT-PANEL KEYS

[

8 ]

BE EB

BE:

E E

□

I MODULATION SOURCE I

'□□□

This function enables you to view or set the HP-IB address from the front panel.

This key enables you to return to local from remote.

You can view or set the RQS mask from the front panel by selecting the keys (

SHIFT

) [ INT ) .

Figure 3-5. HP-IB Related Front-Panel Keys

Model 8642A/B Operation

HP-SB RELATED TERMt*

active function prefix Many HP-IB codes should not be entered without being prefixed by an active function code. For a list of the active function codes and the codes that should be prefixed with an active function code, refer to Table 3-8, Signal Generator Function to HP-IB Code (page 3-32), or Table 3-9, Signal Generator HP-IB Code to Function (page 3-33).

alphanumeric

The 8642A/B has an alphanumeric display; that is, the display can show both alphabetic and numeric

characters.

ASCII

ASCII is an abreviation for American Standard Code for Information Interchange (pronounced "ask-ee").

RQS

RQS (request service) is from the Signal Generator's point of view. The request service (RQS) bit is in the

8642A/B Status Byte. This bit affects when the service request (SRQ) line is pulled on the HP-IB

interface. Refer to page 3-27.

SRQ

SRQ is from the HP-IB controller's point of view. The service request (SRQ) line is a signal line on the HP-IB interface. This line is pulled low by the Signal Generator when it is requesting service. Refer to page 3-27.

The SRQ annunciator in the display of the 8642A/B indicates that this Signal Generator is pulling the HP-IB SRQ line low.

3-35

Model 8642A/B

Operation

RF FREQUENCY CONTENTS

Figure 3-6. RF Frequency-Related Functions 3-38 RF FREQUENCY 3-39

Table 3-10. RF Frequency Operating

Characteristics 3-39

Table 3-11. RF Frequency Band Ranges 3-39

FREQ 3-40

How to Set RF Frequency 3-40

SPCL 8 3-41

How to Select the Het Band

(Special Function 8) 3-41 HP-IB Codes 3-42 Comments 3-42 Related Special Functions 3-42

240.

Decrement Frequency by 0.1 Hz 3-42

241.

Increment Frequency by 0.1 Hz 3-42

242.

Phase Decrement 1 Degree 3-42

243.

Phase Increment 1 Degree 3-42

244.

Phase Decrement 5 Degrees 3-42

245.

Phase Increment 5 Degrees 3-42

250.

Phase Adjustment from Knob and

Step Up, Step Down Keys 3-42

RELATIVE RF FREQUENCY 3-45

REL ZERO 3-45

How to Set the Current Output Frequency

Setting to Be the Frequency Reference 3-45

REF SET 3-46

How to Set a Reference to a Specific

Frequency 3-46 How to Reference to the Signal Generator's

Last-Selected Reference 3-46 How to Display the Current

Frequency Reference 3-46

REL OFF 3-47

How to Turn Off the Frequency Relative

Mode 3-47

HP-IB Codes 3-47 Comments 3-47

RF FREQUENCY SWEEP 3-49

Table 3-12. RF Frequency Sweep Operating

Characteristics 3-49

How to Select Stepped Frequency Sweep 3-50

SPCL 123 3-50

How to Select Phase Continuous Frequency

Sweep (Special Function 123) 3-50

START FREQ, STOP FREQ 3-50

How to Set Start and Stop Frequencies 3-50 How to Stop the Sweep 3-50

AUTO, MANUAL, SINGLE 3-51

How to Select a Sweep Mode 3-51

TIME 3-52

How to Set Sweep Time 3-52

How to Set Sweep Time for Stepped

Frequency Sweep (Using Sweep Time

to Set Frequency Step Size and

Number of Steps) 3-53

How to Set Sweep Time for Phase

Continuous Frequency Sweep (Understanding Limitations Between Sweep Spans and Sweep Times; Also,

How to Set a Specific Number

of X-Axis Steps) 3-60 HP-IB Codes 3-64 Comments 3-64 Related Special Functions 3-65

119.

Disable Settling 3-65

121.

Sweep Up and Down On 3-66

Figure 3-7. Sweep Waveforms 3-66

3-37

Operation Model 8642A/B

RF FREQUENCY

Q3Ea@:

EE0EQ-

0EE0B BEDDED E

■BCD

This key makes RF frequency the active function so its value can be set using either Data keys, the Knob, Step keys,

or the Off/On key.

□ □ □ □

□

"CD

CD"'

CD CD

□

■a

□ □□□□■

These functions enable relative RF frequency settings.

These keys enable an RF frequency sweep. The sweep

modes available are auto, manual, or single.

3-31

□

□ □ □

□>

□ □ □ □ Q □ □□□□'■

Figure 3-6. RF Frequency-Related Functions

These terminator keys enable you to complete a data entry.

Model 8642A/B

Operation

RF FREQUENCY

Description The Signal Generator's fundamental synthesized frequency range of 528.750001 to

1057.500000 MHz is translated over the RF output frequency range listed below. The output frequency range is obtained through frequency division and heterodyne conversion (and frequency multiplication for the 8642B.)

Table 3-

Electrical

Characteristics

Frequency

Range

Underrange Resolution

Frequency Switching Time

'Below 10 kHz, the output level drops rapidly.

10.

RF Frequency Operating Characteristics

Performance Limits

0.100000 to 1057.500000 MHz

0.100000 to 2115.000000 MHz

0.000001 to 0.099999 MHz* 1 Hz (0.1 Hz with Special

Function 240 or 241)

85 ms

Conditions

8642A

8642B

To within 100 Hz of final frequency

The divide bands divide from the fundamental band (divide band 9) as shown in Table

3-11 below. Although the heterodyne band (Het Band) covers a frequency range that is

included in divide bands 1 through 6 (0.100000 to 132.187500 MHz), the heterodyne

conversion technique allows improved modulation characteristics and wider sweep spans

for Phase Continuous Frequency Sweep.

Table 3-11. RF Frequency Band Ranges

Carrier Frequency (MHz)

1057.500001 to 2115.000000

528.750001 to 1057.500000

264.375001 to 528.750000

132.187501 to 264.375000

66.093751 to 132.187500

33.046876 to 66.093750

16.523438 to 33.046875

8.261719 to 16.523437

4.130860 to 8.261718

0.100000 to 4.130859

0.100000 to 132.187500

Band

(8642B only)

9 8 7 6 5 4 3 2 1

HET

Divide Number

0.5 1

2 4 8

16 32 64

256

3-39

Operation

RF Frequency (cont'd)

The divide bands and the Het band have the following advantages: Divide Bands: e Lower phase noise

• Higher output level specifications

Model 8642A/B

Het Band:

Greater stereo separation with

dc-coupled FM

Wider FM/^M deviation at frequencies

less than 132.187501 MHz Greater AM rates in the range from 4.130860

to 33.046875 MHz

Wider frequency spans in Phase Continuous Frequency Sweep (Special Function 123).

Refer to Table 1-1, Specifications (which starts on page differences between the Het band and the divide bands.

The divide bands are normally selected since they have the lowest possible phase noise. However, the Signal Generator will automatically switch to or from the Het band if a setting crosses either a divide band's maximum FM or $M deviation limits or a divide

band's frequency span limits in Phase Continuous Frequency Sweep. In other words, if your settings are not possible in a divide band but are possible in the Het band (at the identical RF frequency), the Signal Generator will sometimes automatically switch to the Het band to allow your settings. However, selecting Special Function 8, Prefer Heterodyne Band, forces the Signal Generator to always operate in the Het band whenever RF frequency is less than 132.187501 MHz (regardless of FM or $M deviation or Phase Continuous Frequency Sweep span limits). This special function prevents the Signal Generator from switching to the divide bands from the Het band when the settings would allow operation in the divide bands.

Refer to Figures 3-12 and 3-13 (page 3-106) for the FM deviation limits in each frequency band. Refer to Modulation, $M (page 3-119) for the $M deviation limits in each frequency band. Refer to RF Frequency Sweep (page 3-49 and 3-60) for information about frequency span limitations in Phase Continuous Frequency Sweep.

Procedure

Note: Put the instrument in its initialized state by selecting 1 INSTR PRESET ].

FREQ How To Set RF Frequency

RF frequency is set by selecting the RF frequency function and then entering the desired frequency: I FREQ ] and the value of the desired RF frequency (up to 10 digits) (in GHz, MHz, kHz, or Hz).

1-7), for the specific

3-40

Example

Set RF frequency to 1.23 MHz.

ENTRY

LOCAL

(keys)

(program

codes)

1 FREQ

DATA

mCDUDGDCS

FR 1.23 MZ

Model 8642A/B

RF Frequency (cont'd)

Display

Operation

3 KJ

Frequency has been set to setting indicates frequency is the active function.

SPCL 8 How To Select the Het Band (Special Function 8)

Either you can select the Het band or the Signal Generator will select Het band operation as described below.

• Selecting Special Function 8 configures the instrument to operate in the Het band whenever the RF frequency is less than 132.187501 MHz, regardless of FM or 4>M deviation or Phase Continuous Frequency Sweep span:

FREQ

1.230000

u tu

SPCL (( SHIFT 1 m ) m.

Turn off Special Function 8:

SPCL (I SHIFT I CZD ) C2J C5J CXI-

• The Signal Generator will automatically select the Het band if you select a combination of RF frequency and FM or $M deviation, or a Phase Continuous Frequency Sweep span beyond the capabilities of the Signal Generator's divide bands. The Signal Generator automatically switches back to a divide band when the combination of functions selected allow divide band operation (unless the Het band is selected with Special Function 8).

-7

MHz. The cursor above the frequency display

•IH

AMPTD

Example

Configure the Signal Generator to operate in the Het band at frequencies less than

132.187501 MHz, regardless of FM or $M deviation or Phase Continuous Frequency

Sweep span settings.

DATA

LOCAL

(keys)

SHIFT

SPCL HET

[-ILU

^!IJ|:^

(program

codes)

Display

B. PREFER HETEROmnE 1RRH

After entering SPCL [ 8 ], the Signal Generator displays the number and description of the Special Function just entered. (To return the display to instrument settings previously displayed, press the [ SHIFT 1 key twice.) The SPCL annunciator indicates the current use of a Special Function.

3-41

Operation

RF Frequency (cont'd)

HP-IB Codes

Keys

Model 8642A/B

Codes

Comments Underranging Specified Frequency

RF frequencies as low as 1 Hz can be selected. However, the Signal Generator's signal

characteristics are not specified below 100 kHz (below 10 kHz the output level falls rapidly). The Signal Generator will not allow overrange settings (settings above

1057.500000 MHz for the 8642A, or above 211 5.000000 MHz for the 8642B).

Selecting the Het Band Increases Specified AM Rates

AM depths are specified for depths less than or equal to 90% at a maximum rate of 20 kHz (in the RF frequency range from 4.1 30860 to 33.046875 MHz). You can increase specified AM rates in this carrier frequency range from a maximum of 20 kHz to a maximum of 100 kHz by selecting Special Function 8 (Prefer Het Band). (The Signal Generator will not automatically select the Het Band in this case.)

Related Special

Functions

240.

Decrement Frequency by 0.1 Hz

241.

Increment Frequency by 0.1 Hz

These functions change the RF signal's output frequency in 0.1 Hz steps each time the special function is selected. For example, selecting SPCL ( [ SHIFT I 1 - I ) 1 2 I I 4 1 f~n increments output frequency by 0.1 Hz.

FREQ GHz MHz kHz Hz SPCL

FR GZ MZ KZ HZ SP

3-42

The Signal Generator cannot directly display this RF frequency increase or decrease in its normal frequency display, so it indicates the change with a lighted MSSG annunciator. Scrolling through the message list using the [ MSSG 1 key will then display the amount of frequency change in the form, "RF.FREQ=DISPLAY -0.2 HZ .142".

This message means that the actual output frequency is the displayed value minus

0.2 Hz. These 0.1 Hz Special Functions are disabled when you set a new frequency

value.

242.

Phase Decrement 1 Degree

243.

Phase Increment 1 Degree

244.

Phase Decrement 5 Degrees

245.

Phase Increment 5 Degrees

These functions change the RF signal's output phase by the indicated amount each time the special function is selected. For example, selecting SPCL ( [ SHIFT I [ - I ) [ 2 1 I 4 1

f~"4~~l

decrements output phase by 5 degrees. The execution of this particular

special function is indicated by the special function verification display which reads

"244.

PHASE DECR 5 DEGREES".

250.

Phase Adjustment from Knob and Step Up and Step Down Keys. This function

enables control over the RF signal's output phase in one degree steps using either the Knob or the Step keys.

Model 8642A/B Operation

RF Frequency (cont'd)

Related Operating Instructions Refer to Relative RF Frequency (page 3-45) for information on designating a

particular frequency as a reference frequency and on displaying all subsequent RF frequencies as offsets from that reference.

Refer to RF Frequency Sweep (page 3-49) for information on selecting a frequency sweep.

Refer to Knob (page 3-141) and Step, Increment Set (page 3-149) for information on using these to modify settings.

Refer to Operating Messages (page 3-177) if the instrument displays a message you want clarified.

Refer to Special Functions (page 3-165) for information about the way these are accessed.

3-43

Model 8642A/B

Operation

RELATIVE RF FREQUENCY

Description Relative Frequency mode enables you to display the output frequency relative to a

reference frequency. This function could be useful, for example, in setting a current frequency to be displayed as an offset from an IF frequency.

Settings for the relative frequency mode range from -2115 to 2115 MHz. The Reference Set function sets the current display to read as an offset from a specific

frequency reference. (The Reference Set function can also be used to display the current frequency reference.) The Relative Zero function sets the current frequency setting to be the frequency reference.

Once a frequency reference is selected, all subsequent frequency entries are displayed as relative frequencies in terms of MHz above or below the frequency reference. This condition exists until the Relative Frequency mode is turned off.

The output frequency is equal to the displayed frequency plus the reference frequency.

Procedures Note: Put the instrument in its initialized state by selecting 1 1NSTR PRESET I.

REL ZERO

How to Set the Current Output Frequency Setting to Be the Frequency Reference

Setting the current output frequency as the frequency reference causes the frequency setting display to become 0.000000 MHz relative: rFREDH REL ZERO (( SHIFT I I AMFTD I ).

Example Configure the front-panel display to read each subsequent frequency relative to a current frequency of 500 MHz.

First select 1 IN5TR PRESET I and set the RF frequency to 500 MHz, then perform the following steps.

ENTRY

REL ZERO

AMPTD

LOCAL

(keys)

(program

codes)

ENTRY

IFREQJ

SHIFT

FRRZ

3-45

Operation Model 8642A/B

Relative RF Frequency (cont'd)

Display

FREQ

REL

The FREQ REL annunciators indicate that the "requency display is relative. All subsequent frequency settings will be entered and displayed as MHz relative to the frequency reference of 500 MHz. The absolute output frequency is the displayed frequency plus the frequency reference.

REF SET How to Set a Reference to a Specific Frequency

Setting a specific RF frequency as the frequency reference causes subsequent frequency settings to display the current output frequency as MHz relative to the frequency reference. I FREQ I REF SET ( I SHIFT I I AMPTD I ) and the value of the desired reference frequency (in GHz, MHz, kHz, or Hz).

Example With a current RF frequency output of 100 MHz, configure the front-panel to allow entry and display of all frequency setting values as an offset from a 1 MHz frequency reference. First select 1 INSTR PRESET I. Then perform the following steps:

m in

-IH tLI

AMPTD

ENTRY

REF SET

IFREOJ

LOCAL (keys)

(program

codes)

ENTRY

TFREO

[

SHIFT!

FRRS 1 MZ

Display

D ra rx ni m ni nt . i u r* r* n m

_J.KJ

KJ kJ KJ u kJ ft kJ.kJ ±i in

FHEQ REL AMPTD

The FREQ REL annunciators indicate the frequency display is relative to a reference frequency. The displayed frequency is 99 MHz (relative); the absolute output frequency is the displayed frequency plus the frequency reference (99 MHz + 1 MHz = 100 MHz).

How to Reference to the Signal Generator's Last-Selected Reference

Turn on the relative frequency mode from the absolute frequency mode by setting the frequency reference to the last-selected value:

1 FREQ 1 REF SET (I SHIFT I I FREQ 1 ) f'OFF ON I

DATA

[T] [f]

How to Display the Current Frequency Reference

( FREQ 1 REF SET ( fgHlFTI I FREQ I )

3-46

Model 8642A/B

Relative RF Frequency (cont'd)

REL OFF How to Turn Off the Frequency Relative Mode

I FREQ I REL OFF (f SHIFT I CgFF ON I ), or I FREQ I REFSET ( r5HlFT~] rTREPTl ) 1 OFF ON I

Operation

Keys

REF SET REL ZERO REL OFF FREQ

OFF ON

Codes

FRRS FRRZ

FRRF

FRRSOF, FRRSON

Comments Range of Relative RF Frequency Settings

Allowable settings for the frequency reference when using either the 8642A or 8642B range from -2115 to 2115 MHz.

(When the relative frequency display is less than or equal to -2000 MHz, the display is

shifted to the right and the 1 Hz (0.0000001 MHz) digit becomes "hidden" under the "M"

of the MZ terminator. Then, with the cursor over the 1 Hz digit, the display resembles a Knob Hold condition because the cursor would be over the "M" of the MZ terminator during Knob Hold also. Knob Hold is discussed on Page 3-143.)

RF Frequency Settings Interact with Other Instrument Settings

Some settings are limited by the interaction of coupled functions (for example, FM deviation and RF frequency). Refer to the appropriate Detailed Operating Instruction for setting limitations, and be aware that any restrictions are due to the absolute output frequency, not the relative frequency setting.

Relative RF Frequency Sweep It is not possible to set an RF frequency sweep in relative units.

Keys

GHz MHz

kHz

Codes

GZ MZ

Related Operating

Instructions Refer to RF Frequency (page 3-42) for additional comments that apply to relative

frequency. Also refer to page 3-42 for information on changing RF frequency by 0.1 Hz

increments (Special Functions 240, 241) and for information on incrementing or decrementing RF output phase in 1 or 5 degree increments (Special Functions 242

through 245 and 250).

Refer to Knob (page 3-141) and Step, Increment Set (page 3-149) for information on using these to modify settings.

Refer to Operating Messages (page 3-177) if the instrument displays a message you want clarified.

Refer to Special Functions (page 3-165) for information about the way these are accessed.

3-47

Model 8642A/B Operation

RF FREQUENCY SWEEP

Description Two types of frequency sweep are available. Stepped Frequency Sweep sweeps from a

start end-point to a stop end-point in linearly spaced, incremental steps. Phase Continuous Frequency Sweep (Special Function 123) sweeps from a start end-point to a stop end-point in a linear, phase continuous manner.

Sweep step size is automatically selected based on the frequency span (which is the absolute value of the start frequency minus the stop frequency) and the sweep time. Although step size for the Stepped Frequency Sweep cannot be directly set, this operating instruction provides ways to calculate a sweep i'ine 10 enable you to select a particular

step size or number of steps,

Table 3-12, RF Frequency Sweep Operating Characteristics

Electrical Characteristics

Digitally Stepped Frequency Sweep

Range

Time

Performance Limits

0.100000 to 1057.500000 MHz

0.100000 to 2115.000000 MHz 275 ms minimum

999s maximum

1 1

8642A 8642B

Conditions

Phase Continuous Frequency Sweep

Maximum Sweep Span

Time

X Axis Output Z Axis Output

1n AUTO sweep mode, it is not po

with a second end-point greater thj (8642B only).

Maximum end-point separation m

than the span shown here. HET t

The HET Band.

Buffer this output in order to use

800.000 kHz (8642B only)

400.000 kHz

200.000 kHz

100.000 kHz

50.000 kHz

25.000 kHz

12.500 kHz

6.250 kHz

3.125 kHz

25.000 kHz

2 2

2 2 2

400.000 kHz 5 ms minimum

999s maximum

Maximum and minimum sweep times are also dependent on the sweep span and carrier frequency.

0 to 10 Vdc TTL Positive True

ssible to set start and stop end-points if one

in 132.187500 MHz (band 6). Also, it is not po

ay be increased up to that shown for the H

and can also be selected with Special Func

the Z-axis output with a plotter for pen lift

End-points can be outside the band but (Start Frequency + Stop Frequency) -r 2 must be within the band.

1057.500001 to 2115.000000 MHz

528.750001 to 1057.500000 MHz

264.375001 to 528.750000 MHz

132.187501 to 264.375000 MHz

66.093751 to 132.187500 MHz

33.046876 to 66.093750 MHz

16.523438 to 33.046875 MHz

8.261719 to 16.523437 MHz

4.130860 to 8.261718 MHz

0.100000 to 4.130859 MHz

0.100000 to 132.187500 MHz

±10%

For crt display blanking

during retrace

end-point is less than 4.130860 MHz (band 2)

ssible to set a sweep across 1057.500000 MHz

:T band by selecting a frequency span larger

:tion 8.

3-49

Operation

Model 8642A/B

RF Frequency Sweep (cont'd)

Procedures Note: Put the instrument in its initialized state by selecting 1 INSTR PRESET!.

How to Select Stepped Frequency Sweep

Stepped Frequency Sweep is turned on by selecting the sweep mode (auto, manual, or single),

parameters are described below). Note that if the sweep mode has not been selected since the last time Instrument Preset has been selected, auto sweep is automatically selected and causes the Signal Generator to begin sweeping immediately after end-points are set. (The SWPNG annunciator indicates that a sweep is occurring.) If Stepped Frequency Sweep is desired but Phase Continuous Frequency Sweep (Special Function 123) is on,

Phase Continuous Frequency Sweep Off (Special Function 223) must be selected.

However, before Special Function 223 can be selected, one of the start or stop

frequencies must be turned off (using a procedure from "How to Stop the Sweep" below).

SPCL 123 How to Select Phase Continuous Frequency Sweep (Special Function 123)

Phase Continuous Frequency Sweep is turned on by first selecting Special Function 123, then, by selecting the sweep mode (auto, manual, or single), sweep time, and start and stop frequencies (procedures for selecting these parameters are described below). Note that if the sweep mode has not been selected since the last time Instrument Preset has been selected, auto sweep is automatically selected and causes the Signal Generator to begin sweeping immediately after end-points are set. (The SWPNG annunciator indicates that a sweep is occurring.) If Phase Continuous Frequency Sweep is desired but Stepped Frequency Sweep is on, one of the start or stop frequencies must be turned off (using a procedure from "How to Stop the Sweep" below) before Phase Continuous Frequency Sweep (Special Function 123) can be selected.

sweep time, and the start and stop frequencies (procedures for selecting these

START

How to Set Start and Stop Frequencies

How to Stop the Sweep

FREQ,

STOP FREQ

Set specific start and stop frequency values: Start Frequency [ START FREQ ) and the value of the desired sweep start end-point (in GHz, MHz, kHz, or Hz). Stop Frequency 1 STOP FREQ 1 and the value of the desired sweep stop end-point (in GHz, MHz, kHz, or Hz).

You can also set last-selected start and/or stop frequency values by selecting I START FRED~) [ OFF ON I and/or I STOP FREQ I ( OFF ON I (HP-IB codes: FAON and FBON).

You can stop the sweep by turning off both the start and stop end-point settings: i START FREQ I I OFF ON I I STOP FREQ I 1 OFF ON I (HP-IB codes: FAOF FBOF) When sweep is stopped, the output frequency setting is equal to the end-point value that was turned off last. (We recommend you exit frequency sweep this way to prevent Parameter Changed messages discussed on page 3-182.)

You can also stop the sweep by turning off just one of the end-point settings (when both end-points are set), for example: ( START FREQ I I OFF ON I (HP-IB code: FAOF)

When sweep is stopped, the output frequency setting is equal to the remaining displayed

end-point value (the value of the stop frequency). We recommend you turn off

frequency sweep this way when you want to set a function to occur during a frequency

sweep (for example, AM).

3-50

Model 8642A/B

RF Frequency Sweep (cont'd)

During auto or single sweep (in Stepped ; requency Sweep) you can stop the sweep and display the actual output frequency by selecting manual sweep. MANUAL (1 SHIFT 1 I STOP FREQ1 )

Selecting either I FREQ I. [ START AMPTTJT or I STOP AMPTD ) will also turn off the sweep but may cause a Parameter Changed message. (These messages are discussed on page 3-1 82.)

AUTO, MANUAL, SINGLE

How to Select a Sweep Mode

Sweep modes available are auto, manual, and single. [ START FREQ I or [ STOP FREQ 1 must first be selected before one of the frequency sweep modes can be selected.

Auto Sweep Auto sweep continually repeats the sweep sequence from start frequency to stop frequency: AUTO (1 SHIFT I f START AMPTD I ) (HP-IB code: FASA) The SWPNG annunciator is continuously displayed. (During Stepped Frequency Sweep, the auto sweep can be stopped to display the actual output frequency by selecting manual sweep).

Operation

In Stepped Frequency Sweep, auto sweep mode does not allow the following settings:

• Setting start and stop frequency end-points if one end-point is less than 4.130860 MHz (Frequency Band 2) with a second end-point greater than 132.187500 MHz (Frequency Band 6). (For more information about frequency bands, refer to RF

Frequency, page 3-39.)

Manual Sweep Selecting manual sweep does not start a sweep, but enables the Knob or the Step keys to control a frequency sweep: MANUAL (I SHIFT I I STOP FREQ~~I ) (HP-IB code: FASM) Turn the Knob or select the Step keys to sweep between end-points. The actual output frequency as well as the SWPNG annunciator are displayed during the frequency sweep.

HP-IB: since Knob rotation is not possible via HP-IB.

Single Sweep Selecting single sweep will start or restart a single .-weep. Single sweep initiates one sweep only; at the end of the sweep, the output frequency remains at the final end-point value: SINGLE ( ( SHIFT I ( STOP AMPTD I ) (HP-IB code: FASG) The SWPNG annunciator is displayed for the duration of the single sweep. During Stepped Frequency Sweep, you can * the sweep and display the actual output frequency by seledme manual sweep. (When operating th" instrument locally, a single sweep can also be conveniently restarted by pressing the (~OPi QrT~) key twice when in the single sweep mode. Start frequency or stop frequency must ;e the active function in order to use the Off/On function in this way.)

You can use the step keys (HP-IB: UP, DN) to sweep in the manual sweep mode

3-51

Operation

RF Frequency Sweep (cont'd)

TIME

How to Set Sweep Time

Sweep time setting limitations are different for Stepped Frequency Sweep and for Phase

Continuous Frequency Sweep.

In all cases, sweep time is set using the following procedure: TIME ( 1 SHIFT I fSTART FREQ I ) and the value of the desired sweep time in s or ms ( ( MHZ V I or I KHZ_MV I respectively) Selecting TIME ( ( SHIFT I I START FREQl ) alone displays the current sweep time setting. If sweep time is not specified, the Signal Generator uses the sweep time value last entered for either amplitude or frequency sweep.

Note that in Stepped Frequency Sweep, a faster sweep time usually results in fewer steps with a larger step size. For Phase Continuous Frequency Sweep, sweep span and sweep time are coupled together;

that is, one may limit the setting of the other. Also, frequency will change in a phase

continuous manner but the X-axis output will change in steps. The following pages contain detailed information about how to understand the

relationships between sweep span, sweep time, step size, and number of steps for both Stepped Frequency Sweep and Phase Continuous Frequency Sweep. If you are not interested in these details, you can just adjust sweep time until the approximate desired number of steps or step size is obtained. (To skip these sweep time details, turn to page

3-64.)

Model 8642A/B

The remaining portion of "How to Set Sweep Time" is comprised of two parts.

The first part (which starts on page 3-53) develops some calculations for Stepped

Frequency Sweep that will enable you to determine:

1) the number of steps automatically selected,

2) the frequency step size automatically selected,

3) the required sweep time that will select a desired number of frequency steps, and

4) the required sweep time that will select a desired step size.

The second part (which starts on page 3-60) develops some calculations for Phase

Continuous Frequency Sweep that v/ill enable you to choose frequency span and sweep

time so each allows the other's settings. The sweep span limits listed for Phase

Continuous Frequency Sweep in Table 3-12 (page 3-49) will not necessarily be possible

unless sweep time is set within limits that will allow that sweep span. This same

restriction holds true when setting sweep time; that is, the sweep time settings listed in

Table 3-16 will not necessarily be possible unless sweep span is set within limits that will

allow that sweep time.

The calculations for this second part allow you to determine:

1) the minimum sweep span for a desired sweep time and frequency band,

2) the maximum sweep span for a desired sweep time and frequency band,

3) the minimum sweep time for a desired sweep span and frequency band,

4) the maximum sweep time for a desired sweep span and frequency band,

5) the number of automatically selected X-axis steps based on a sweep time setting, and

6) the required sweep time to select a specific number of X-axis steps.

3-52

Model 8642A/B Operation

RF Frequency Sweep (cont'd)

How to Set Sweep Time for Stepped Frequency Sweep

(Using Sweep Time to Set Frequency Step Size and Number of Steps)

The operating characteristics for sweep time are as follows:

Minimum Sweep Time Maximum Sweep Time Sweep Time Resolution Minimum Frequency Sweep Step Size

275 ms 999s

1 ms 1 Hz

Minimum Frequency Dwell Time Per Point:

Settling Status

Special Function 119

(Disable Settling)

Special Function 219

(Re-enable Settling)

8642A

60 ms

110 ms

8642B

80 ms

135 ms

Stepped Frequency Sweep Calculations

Since the sweep step size is not directly selectable, the following calculations provide ways to determine:

1) the number of steps automatically selected (page 3-53)

2) the frequency step size automatically selected (page 3-54)

3) the required sweep time that will select a desired number of frequency steps (page

3-54), and

4) the required sweep time that will select a desired step size (page 3-57). However, these calculations do not directly apply to situations when the start end-point is equal to the stop end-point (zero span). Refer to "Zero Span for Stepped Frequency Sweep" on page 3-64 for information about X-axis steps in zero span.

The minimum frequency dwell time per point is different depending on whether you have an 8642A or 8642B and whether you have selected Special Function 119. So,

whenever you see the term "Min. Dwell Time" in a calculation, use the table above that lists the Minimum Frequency Dwell Time Per Point to determine the value of that term.

Also,

frequency points are truncated to 1 Hz. Span is always an integer since end-points

are integers.

1) Calculate the number of steps automatically selected.

The number of steps is the minimum of:

1023

| Start Frequency (in Hz) — Stop Frequency (in Hz) \

INTEGER OF | Sweep Time (mms) ^

Min. Dwell Time (in ms)

3-53

Operation

RF Frequency Sweep (cont'd)

2) Calculate the sweep step size automatically selected.

The result can be a non-integer, but actual frequency points are truncated to 1 Hz (the total number of points is equal to the total number of steps + 1). The sweep step size is the maximum of:

Start Frequency

INTEGER OF

3) Calculate a sweep time that could be selected for a desired number of steps.

1 Hz

(in Hz) —

Stop Frequency

1023

(in Hz) —

Sweep Time (in ms)

Min. Dwell Time (in ms)

Stop Frequency

Model 8642A/B

(in Hz)\

(in Hz) \

3a) First you must ensure that the desired number of steps is between the maximum and minimum number of steps possible.

The maximum number of frequency steps is equal to the minimum of:

1023

Start Frequency

The minimum number of frequency steps equals the minimum of:

INTEGER OF

| Start Frequency (in Hz) - Stop Frequency (in Hz)\

(in Hz) -

Min. Dwell Time (in ms)

Stop Frequency

1 Hz

275 ms

1 Hz

(in Hz) \

3-54

3b) If the desired number of steps is equal to the maximum, use a sweep time setting (in

ms) equal to or greater than the result of the following equation:

(Number of Steps +1) X Min. Dwell Time (in ms)

Model 8642A/B

RF Frequency Sweep (cont'd)

If the desired number of steps is less than the maximum calculated in 3a, use a sweep time setting (in ms) greater than or equal to the result of the above calculation but less than the result of the following calculation:

(Number of Steps +2) X Min. Dwell Time {in ms)

Example for Calculation #3 (Stepped Frequency Sweep)

In an 8642B, set a stepped frequency sweep from 100 to 500 MHz with 100 frequency steps with Special Function First select Special Function 1 19:

SPCL ( I SHIFT 1 CZD ) OJ OD CO

Calculate the required sweep time setting for the 100 frequency steps using calculation

#3:

Maximum number of steps is equal to the minimum of 1 023 or:

1 1

9 (Disable Settling) selected.

Operation

100 000 000 Hz - 500 000 000 Hz |

1 Hz

Since 1023 is less than 400 000 000, the maximum number of steps is 1023.

Minimum number of steps is equal to the minimum of:

INTEGER OF

1100 000 000 Hz - 500 000 000 Hz

1 Hz

Since 2 is less than 400 000 000, the minimum value of steps is 2.

Therefore, it should be possible to select 1 00 steps si. e that value is between the

minimum value (2) and maximum value (1023).

•no

~80~

400 000 000

= 400 000 000

3-55

Operation

RF Frequency Sweep (cont'd)

Example for Calculation #3 (cont'd)

To get 100 frequency steps, you can set the sweep time between the results of the following calculations:

(100 +1) X 80 ms = 8080 ms or 8.080s (100 +2) X 80 ms = 8160 ms or 8.160s

Model 8642A/B

SWEEP

[ START I FREO

I SHIFT

]

SWEEP

AUTO

I START] I AMPTD

SWEEP

I SHIFT

]

TIME

f START |

FREO

)

GO □ CD [g

DATA

LOCAL

(keys)

(program

SWEEP

[ START I FREQ

DATA

QELiJS

SWEEP

I STOP

I FREQ

CZD

DO GO

DATA

FASA ST 8.1 SC FA 100 MZ FB 500 MZ*

codes)

* These codes are not independent and might need to follow a specific sequence for entry. Refer to the discussion about Sequence Dependency, which begins on page 3-12 in the HP-IB portion of this Section III.

Display

<rararararararararn

> KJ KJ.KJ KJ KJ KJ *u kj in i-

START FREQ SWPNG

_) KJ KJ-fcJ KJ KJ KJ KJ KJ Nf L.

STOP

3-56

The display usually shows the start frequency and the stop frequency settings. If another

active function is selected, the display could indicate frequency sweep with the SWPNG annunciator or by displaying FRQ SWEEPING in the left portion of the display above the FREQ annunciator.

Model 8642A/B

RF Frequency Sweep (cont'd)

4) Calculate a sweep time setting that could be selected for a desired step size.

4a) You need to choose the step size so the frequency span divided by the step size is an integer. You must also ensure that the desired step size is between the maximum and minimum step size possible.

The maximum step size is equal to the maximum of:

Start Frequency

INTEGER OF

The minimum step size is equal to the maximum of:

1 Hz

(in Hz) -

Min. Dwell Time (in ms)

Stop Frequency

o ms

Operation

(in Hz)\

1 Hz

Start Frequency

4b) When the sweep step size equals the minimum, use a sweep time setting (in ms) equal to or greater than the result of the following calculation.

| Start Frequency (in Hz) - Stop Frequency (in Hz)\

Step Size (in Hz)

When the sweep step size is greater than the minimum, use a sweep time setting greater than or equal to the result of the above calculation, but less than the result of the following calculation:

| Start Frequency (in Hz) - Stop Frequency (in Hz) |

Step Size (in Hz)

(in Hz) —

1023

Stop Frequency

+ 1

+ 2

(in Hz)

X Min. Dwell Time (in ms)

3-57

Operation

RF Frequency Sweep (cont'd)

Example for Calculation #4 (Stepped Frequency Sweep)

In an 8642B, set a stepped frequency sweep from 1 00 to 500 MHz with a sweep step size

of 8 MHz with Special Function 219 (Re-Enable Settling). First select Instrument Preset:

I INSTR PRESET I

Calculate the required sweep time setting for an 8 MHz step size using calculation #4:

Ensure that an integer results when the frequency span of 400 MHz is divided by the step size of 8 MHz.

Maximum step size is equal to the maximum of 1 Hz or:

400 MHz

8 MHz

Model 8642A/B

= 50

1100 000 000 Hz - 500 000 000 Hz

INTEGER OF | -^- - 1

135

Since 400 MHz is greater than 1 Hz, the maximum step size is 400 MHz.

Minimum step size is equal to the maximum of 1 Hz or:

1100 000 000 Hz - 500 000 000 Hz\

1023

Since 0.391006 MHz is greater than 1 Hz, the minimum step size is 0.391006 MHz.

Therefore, it should be possible to select an 8 MHz step size since that value is between the minimum value (0.391006 Hz) and maximum value (400 MHz).

= 400 000 000 Hz or 400 MHz

= 391 006 Hz or 0.391006 MHz

3-58

HP 8642a, 8642b schematic

Specifications and Main Features

Frequently Asked Questions

User Manual