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Operation and Service
Guide
HP 8647A Signal Generator
SERIAL NUMBERS
This manual applies directly to all instruments with serial prefix
3247A and 3349A.
HP Wt NO. 08647-90006
Printed in USA March 1994
Notice. The information contained in this document is subject to
change without notice.
Hewlett-Packard makes no warranty of any kind with regard to this
material, including but not limited to, the implied warranties of
merchantability and fitness for a particular purpose. Hewlett-Packard
shall not be liable for errors contained herein or for incidental
or consequential damages in connection with the furnishing,
performance, or use of this material.
@ Copyright Hewlett-Packard Company 1994
All Rights Reserved. Reproduction, adaptation, or translation without
prior written permission is prohibited, except as allowed under the
copyright laws.
1400 Fountaingrove Parkway, Santa Rosa CA, 95403-1799, USA
Reproduced with Permission, Courtesy of Agilent Technologies, Inc.
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 calibration measurements
are traceable to the United States National Institute of Standards and
Technology, to the extent allowed by the Institute's calibration facility,
and to the calibration facilities of other International Standards
Organization members.
Regulatory The regulatory information is in Chapter 4, "Specifications.
Information
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 Hewlett-Packard. Buyer shall prepay
shipping charges to Hewlett-Packard and Hewlett-Packard shall pay
shipping charges to return the product to Buyer. However, Buyer shall
pay all shipping charges, duties, and taxes for products returned to
Hewlett-Packard from another country.
Hewlett-Packard warrants that its software and firmware designated
by Hewlett-Packard for use with an instrument will execute
its programming instructions when properly installed on that
instrument. Hewlett-Packard 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 misuse,
operation outside of the environmental specifications for the
product, or improper site preparation or maintenance.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED.
HEWLETT-PACKARD 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. HEWLETT-PACKARD SHALL NOT BE
LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, WHETHER J3ASED ON CONTRACT,
TORT, OR ANY OTHER LEGAL THEORY.
iii
Assistance Product maintenance agreements and other c u s t o m assistance
agreements are available for Hewlett-Rzckard products. mr any
assistance, contact your nearest Hewlett-Rzckard Sales and Semvice
O e &fer to the list of Sales and Sewice O ~ e on the following
m. s
page.
iv
Hewlett-Packard Sales and Service Offices
US FIELD OPERATIONS EUROPEAN OPERATIONS INTERCON OPERATIONS
HEADQUARTERS HEADQUARTERS HEADQUARTERS
Hewlett-Packard Company Hewlett-Packard S.A. Hewlett-Packard Company
19320 Pruneridge Avenue 150, Route du Nant-d'Avril 3495 Deer Creek Rd.
Cupertino, CA 95014, USA 1217 Meyrin 2/Geneva Palo Alto, California 94304-1316
(800) 752-0900 Switzerland (415) 857-5027
(41 22) 780.8111
California Australia
Hewlett-Packard Co. France Hewlett-Packard Australia Ltd.
1421 South Manhattan Ave. Hewlett-Packard France 31-41 Joseph Street
Fullerton, CA 92631 1 Avenue Du Canada BIackburn, Victoria 3130
(714) 999-6700 Zone D'Activite De Courtaboeuf (61 3) 895-2895
F-91947 Les Ulis Cedex
Hewlett-Packard Co. France Canada
301 E. Evelyn (33 1) 69 82 60 60 Hewlett-Packard (Canada) Ltd.
Mountain View, CA 94041 17500 South Service Road
(415) 694-2000 Germany Trans-Canada Highway
Hewlett-Packard GmbH Kirkland, Quebec H9J 2x8
Colorado Hewlett-Packard Strasse Canada
Hewlett-Packard Co. 6380 Bad Homburg v.d.H (514) 697-4232
24 Inverness Place, East Germany
Englewood, CO 80112 (49 6172) 16-0
(303) 649-5000 Japan
Great Britain Yokogawa-Hewlett-Packard Ltd.
Georgia Hewlett-Packard Ltd. 1-27-15 Yabe, Sagamihara
Hewlett-Packard Co. Eskdale Road, Winnersh Triangle Kanagawa 229, Japan
2000 South Park Place Wokingham, Berkshire R G l l 5DZ (81 427) 59-1311
Atlanta, GA 30339 England
(404) 955-1500 (44734) 696622
China
Illinois China Hewlett-Packard, Co.
Hewlett-Packard Co. 38 Bei San Huan X1 Road
5201 Tollview Drive Shuang Y Shu
u
Rolling Meadows, IL 60008 Hai Dian District
(708) 255-9800 Beijing, China
(86 1) 256-6888
New Jersey
Hewlett-Packard Co. Singapore
150 Green Pond Road Hewlett-Packard Singapore
Rockaway, N J 07866 Pte. Ltd.
(201) 627-6400 1150 Depot Road
Singapore 0410
Texas (65) 273 7388
Hewlett-Packard Co.
930 E. Campbell Rd. miwan
Richardson, TX 75081 Hewlett-Packard 'hiwan
(214) 231-6101 8th Floor, H-P Building
337 Fu Hsing North Road
'Mpei, Taiwan
(886 2) 712-0404
V
Safety Notes The following safety notes are used throughout this manual.
Familiarize yourself with each of the notes and its meaning before
operating this instrument.
Caution Caution denotes a hazard. It calls attention to a procedure that, if
not correctly performed or adhered to, would result in damage to or
destruction of the instrument. Do not proceed beyond a caution sign
until the indicated conditions are fully understood and met.
Warning Warning denotes a hazard. It calls attention to a procedure
which, if not correctly performed o r adhered to, could result in
injury or loss of life. Do not proceed beyond a warning note until
the indicated conditions are fully understood and met.
Instrument The following markings and caution and warning labels are used on
the instrument. Be sure to observe all cautions and warnings.
Markings
Instruction The instruction documentation symbol. The product
Manual is marked with this symbol when it is necessary for the
A user to refer to the instruction in the manual.
The CE93 mark shows compliance with European Community 1993
standards.
The CSA mark is the Canadian Standards Association safety mark.
The ISM1-A mark is a symbol of an Industrial Scientific and Medical
Group 1, Class A product.
Warning Hazardous voltage always present in this area with instrument
power cord connected t o a c line.
Warning Hazardous Voltage
vi
Caution Hazardous electrical shock. Heat sink is live. Disconnect power
supply before servicing.
General Safety
Considerations
Warning No operator serviceable parts inside. Refer servicing to qualified
personnel. To prevent electrical shock, do not remove covers.
Warning If this instrument is used in a manner not specified by
Hewlett-Packard Co., the protection provided by the instrument
may be impaired.
Warning For continued protection against fire hazard replace line fuse
only with same type and rating (3 A 250 V type F). The use of
other fuses or material is prohibited.
Caution Always use the three-prong ac power cord supplied with this
instrument. Failure to ensure adequate earth grounding by not using
this cord may cause instrument damage.
vii
How to Use This
Guide
This guide uses the (FRONT-PANEL KEY] This represents a key physically located on
following convention: the instrument.
Display Text in this font represents FREQUENCY,
MODULATION, and AMPLITUDE displays.
Documentation This guide contains the information required to operate, calibrate, and
Description repair the signal generator to the assembly level. Included are the
following:
a quick overview of the signal generator
examples of typical operation
rn a reference section that describes all operation features
rn explanations of error messages displayed on the signal generator
installation instructions
rn tables of specifications
theory of operation of the signal generator
rn troubleshooting procedures to identify failed assemblies
replaceable part numbers
adjustments required after repair or performance test failure
performance tests to test the instrument to specifications
viii
Contents
1 . Operation
Quick Overview . . . . . . . . . . . . . . . . . . . 1-2
1. PowerKey . . . . . . . . . . . . . . . . . . . 1-2
2 . Display Contrast . . . . . . . . . . . . . . . . . 1-2
3. Function and Data Keys . . . . . . . . . . . . . 1-2
4 . Increment Set Keys . . . . . . . . . . . . . . . 1-2
5 . Knobs . . . . . . . . . . . . . . . . . . . . . . 1-2
6. MEMORY . . . . . . . . . . . . . . . . . . . . 1-3
7 . Modulation Source . . . . . . . . . . . . . . . . 1-3
la . Operation Examples
Getting Started . . . . . . . . . . . . . . . . . . . . 1a-1
Operation Examples . . . . . . . . . . . . . . . . 1a-1
Setting the RF Output Signal . . . . . . . . . . . . . 1a-2
Setting the Frequency . . . . . . . . . . . . . . . 1a-2
Setting the Amplitude . . . . . . . . . . . . . . . 1a-2
Turn on the RF Output . . . . . . . . . . . . . . . 1a-3
Setting the Modulation . . . . . . . . . . . . . . . 1a-3
Incrementing or Decrementing the RF Output Signal . . 1a-4
Preliminary Steps . . . . . . . . . . . . . . . . . . 1a-4
Using the Knob . . . . . . . . . . . . . . . . . . . 1a-4
Using the Increment keys . . . . . . . . . . . . . . 1a-5
Using the Memory Registers . . . . . . . . . . . . . . 1a-6
Saving Instrument Settings in Register Sequences . . . 1a-7
Selecting the Sequence . . . . . . . . . . . . . . 1a-7
Saving Settings in Registers . . . . . . . . . . . . 1a-7
Checking the Sequence . . . . . . . . . . . . . . 1a-9
Checking a Different Sequence . . . . . . . . . . 1a-9
Deleting a Register from the Sequence . . . . . . . . 1a-11
Selecting the Sequence . . . . . . . . . . . . . . 1a-11
Deleting a Register . . . . . . . . . . . . . . . . 1a-11
Renumbering the Registers in a Sequence . . . . . . 1a-13
Decreasing the Register Number . . . . . . . . . . 1a-13
Checking the Sequence . . . . . . . . . . . . . . 1a-14
Inserting a Register in a Sequence . . . . . . . . . . 1a-15
Saving a New Register . . . . . . . . . . . . . . 1a-16
Offsetting the RF Output from a Reference . . . . . . . 1a-17
Setting the Reference Value . . . . . . . . . . . . . 1a-17
Offsetting the RF Output . . . . . . . . . . . . . . 1a-18
Turning the Reference Mode Off or On . . . . . . . 1a-18
Setting a New Reference Value . . . . . . . . . . 1a-19
Holding the Output Attenuator Range . . . . . . . . . 1a-20
Set the Amplitude Level . . . . . . . . . . . . . . 1a-20
Holding the Attenuator . . . . . . . . . . . . . . . 1a-20
Adjusting the Amplitude . . . . . . . . . . . . . . 1a-21
Contents-1
.
lb Operation Reference
Frequency and Amplitude . . . . . . . . . . . . . . . 1b-2
1 . Knob . . . . . . . . . . . . . . . . . . . . . . 1b-2
2 . Digit-Select Arrow Keys . . . . . . . . . . . . . 1b-2
3. REFSET . . . . . . . . . . . . . . . . . . . . 1b-3
Units . . . . . . . . . . . . . . . . . . . . . . . 1b-3
4 . REF ON/OFF . . . . . . . . . . . . . . . . . . . 1b-3
Function . . . . . . . . . . . . . . . . . . . . . . . 1b-4
1. FREQUENCY . . . . . . . . . . . . . . . . . . 1b-4
2 . AMPLITUDE . . . . . . . . . . . . . . . . . . 1b-4
3 . FMAM4M . . . . . . . . . . . . . . . . . . . 1b-4
INCREMENT SET . . . . . . . . . . . . . . . . . . . 1b-5
1 . INCRSET . . . . . . . . . . . . . . . . . . . . 1b-5
Data . . . . . . . . . . . . . . . . . . . . . . . . . 1b-6
1 . MHz/dBm . . . . . . . . . . . . . . . . . . . . 1b-6
Units Conversion . . . . . . . . . . . . . . . . . 1b-6
2 . Backspace . . . . . . . . . . . . . . . . . . . . 1b-6
3 . emf . . . . . . . . . . . . . . . . . . . . . . . 1b-6
4.f . . . . . . . . . . . . . . . . . . . . . . . . 1b-6
Instrument Preset . . . . . . . . . . . . . . . . . . 1b-7
(POWER] @ . . . . . . . . . . . . . . . . . . . . 1b-7
C m - [DEL) . . . . . . . . . . . . . . . . . . . . 1b-7
HP-IB . . . . . . . . . . . . . . . . . . . . . . . . 1b-9
1 . ADRS . . . . . . . . . . . . . . . . . . . . . . 1b-9
2 . LOCAL . . . . . . . . . . . . . . . . . . . . . 1b-9
MEMORY . . . . . . . . . . . . . . . . . . . . . . 1b-10
1.SAV . . . . . . . . . . . . . . . . . . . . . . . 1b-11
2 . REG . . . . . . . . . . . . . . . . . . . . . . 1b-12
3. Register Recall Arrows . . . . . . . . . . . . . . 1b-12
4 . SEQ . . . . . . . . . . . . . . . . . . . . . . . 1b-13
5. DEL . . . . . . . . . . . . . . . . . . . . . . 1b-14
Renumbering the Registers . . . . . . . . . . . . 1b-14
Modulation Source . . . . . . . . . . . . . . . . . . 1b-15
1 . MODON/OFF . . . . . . . . . . . . . . . . . . 1b-16
2 . INT 400 Hz INT 1 kHz . . . . . . . . . . . . . . 1b-16
3. EXTACEXTDC . . . . . . . . . . . . . . . . . 1b-16
4 . 1 kHz + EXT DC . . . . . . . . . . . . . . . . 1b-17
Setting the Modulation Level . . . . . . . . . . . 1b-17
5. MOD INPUT/OUTPUT . . . . . . . . . . . . . . 1b-17
RF OUTPUT . . . . . . . . . . . . . . . . . . . . . 1b-18
1. RFON/OFF . . . . . . . . . . . . . . . . . . . 1b-18
2 . ATTNHOLD . . . . . . . . . . . . . . . . . . . 1b-18
Vernier Ranges . . . . . . . . . . . . . . . . . . 1b-18
3. RFOUTPUT . . . . . . . . . . . . . . . . . . . 1b-19
Rear Panel . . . . . . . . . . . . . . . . . . . . . . 1b-20
1 . 10 MHz REF INPUT and OUTPUT . . . . . . . . . 1b-20
2 . DISPLAY CONTRAST . . . . . . . . . . . . . . . 1b-20
3. AUXILIARY INTERFACE . . . . . . . . . . . . . 1b-21
4 . Line Voltage Connector . . . . . . . . . . . . . 1b-21
5 . HP-IB Connector . . . . . . . . . . . . . . . . . 1b-21
6. TIMEBASEADJUSTandHelpSwitches . . . . . . 1b-21
Remote Interface (Accessory) . . . . . . . . . . . . . 1b-22
1. MODON/OFF . . . . . . . . . . . . . . . . . . 1b-22
2 . RFON/OFF . . . . . . . . . . . . . . . . . . . 1b-22
3. Sequence Selection Arrows . . . . . . . . . . . . 1b-23
Contents2
4 . Register Recall Arrows . . . . . . . . . . . . . . lb-23
Memory Interface (Accessory) . . . . . . . . . . . . . 1b-24
1. POWER . . . . . . . . . . . .......... 1b-24
2. Copy Arrow Keys . . . . . . . . . . . . . . . . 1b-25
Making a Copy . . . . . . . . . . . . . . . . . . 1b-25
3.BUSY . . . . . . . . . . . . .......... 1b-25
IC. Operation Messages
Front Panel Operation Messages . . . . . . . . . . . . 1c-1
HP-IB .Command Errors . . . . . . . . . . . . . . . 1c-5
HP-IB Execution Errors . . . . . . . . . . . . . . . . 1c-7
HP-IB Device-Specific Errors . . . . . . . . . . . . . 1c-7
HP-IB Query Errors . . . . . . . . . . . . . . . . . . 1c-7
Service Messages . . . . . . . . . . . . . . . . . . . 1c-8
2 . Hp-IB Programming
Background . . . . . . . . . . . . . . . . . . . . . 2-1
Programming Guidelines . . . . . . . . . . . . . . . 2-3
HP-IB Definition . . . . . . . . . . . . . . . . . . 2-3
What is Programmable . . . . . . . . . . . . . . . 2-3
HP-IB Address . . . . . . . . . . . . . . . . . . . 2-3
Error Messages . . . . . . . . . . . . . . . . . . . 2-3
Programming Language . . . . . . . . . . . . . . . 2-3
Query . . . . . . . . . . . . . . . . . . . . . . . 2-3
Advanced Programming . . . . . . . . . . . . . . . 2-3
Programming Examples . . . . . . . . . . . . . . . . 2-4
Programming RF Frequency . . . . . . . . . . . . . 2-4
Programming RF Frequency and FM Modulation . . . 2-4
Querying RF Frequency . . . . . . . . . . . . . . . 2-5
Programming RF Amplitude . . . . . . . . . . . . . 2-5
HP-IB Status Reporting . . . . . . . . . . . . . . . . 2-8
External Modulation Input Level Status . . . . . . . 2-9
Example: Check the Condition of Modulation Input
(High or Low) . . . . . . . . . . . . . . . . . 2-9
Example: Generate a Service Request for External
Modulation Input (High or Low) . . . . . . . . 2-10
Reverse Power Protection Status . . . . . . . . . . 2-11
Example: Check the condition of the RPP . . . . . 2-11
Unspecified Power (Amplitude) Entry Status . . . . . 2-11
Example: Check the Condition of Unspecified Power
Entry . . . . . . . . . . . . . . . . . . . . . 2-12
HP 8647A SCPI Command Reference . . . . . . . . . 2-13
AM Subsystem . . . . . . . . . . . . . . . . . . . 2-14
CAL Subsystem . . . . . . . . . . . . . . . . . . . 2-14
FM Subsystem . . . . . . . . . . . . . . . . . . . 2-15
FREQuency Subsystem . . . . . . . . . . . . . . . 2-16
OUTPut Subsystem . . . . . . . . . . . . . . . . . 2-16
PM Subsystem . . . . . . . . . . . . . . . . . . . 2-17
POWer Subsystem . . . . . . . . . . . . . . . . . 2-18
STATUSSubsystem . . . . . . . . . . . . . . . . . 2-19
SYSTem Subsystem . . . . . . . . . . . . . . . . . 2-20
HP-IB Capabilities . . . . . . . . . . . . . . . . . . 2-21
HP-IB Connector Information . . . . . . . . . . . . . 2-22
Contents3
3 . Installation
Unpacking Your Signal Generator . . . . . . . . . . . 3-1
Connecting AC Power . . . . . . . . . . . . . . . . . 3-1
Power Requirements . . . . . . . . . . . . . . . . 3-2
Replacing the Fuse . . . . . . . . . . . . . . . . . 3-2
Turning On the Signal Generator . . . . . . . . . . . 3-5
Connecting to Other Instruments . . . . . . . . . . . 3-5
Storing the Signal Generator . . . . . . . . . . . . . 3-5
Shipping the Signal Generator . . . . . . . . . . . . . 3-6
4 . Specifications
Frequency Specifications . . . . . . . . . . . . . . . 4-2
Internal Reference Oscillator . . . . . . . . . . . . . 4-2
output . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Spectral Purity . . . . . . . . . . . . . . . . . . . . 4-3
Frequency Modulation . . . . . . . . . . . . . . . . 4-4
Phase Modulation . . . . . . . . . . . . . . . . . . . 4-5
Amplitude Modulation . . . . . . . . . . . . . . . . 4-5
Modulation Source . . . . . . . . . . . . . . . . . . 4-6
Remote Programming . . . . . . . . . . . . . . . . . 4-6
Environmental . . . . . . . . . . . . . . . . . . . . 4-6
General . . . . . . . . . . . . . . . . . . . . . . . 4-6
Regulatory Information . . . . . . . . . . . . . . . . 4-8
IS0 9002 Compliant . . . . . . . . . . . . . . . . . 4-8
Statement of Compliance . . . . . . . . . . . . . . 4-8
Noise Declaration . . . . . . . . . . . . . . . . . . 4-8
5 . Service
Shipping Your Instrument Back to Hewlett-Packard . . . 5-1
Operation Verification Software . . . . . . . . . . . . 5-2
5a. Theory of Operation
Introduction . . . . . . . . . . . . . . . . . . . . . 5a-1
Overview . . . . . . . . . . . . . . . . . . . . . 5a-2
A1 Front Panel . . . . . . . . . . . . . . . . . . . 5a-2
A2 Power Supply . . . . . . . . . . . . . . . . . . 5a-3
A3 Motherboard . . . . . . . . . . . . . . . . . . 5a-3
A4 Reference . . . . . . . . . . . . . . . . . . . 5a-4
A5 Sig Gen Synth . . . . . . . . . . . . . . . . . . 5a-4
A6 Output . . . . . . . . . . . . . . . . . . . . . 5a-4
A7 Attenuator . . . . . . . . . . . . . . . . . . . 5a-5
5b. Troubleshooting Information
Introduction . . . . . . . . . . . . . . . . . . . . . 5b-1
Troubleshooting Checklist . . . . . . . . . . . . . . . 5b-2
AC Mains (line) Fuse Removal . . . . . . . . . . . . . 5b-3
To Remove the Fuse . . . . . . . . . . . . . . . . 5b-3
Modulation Testpoints and Power Supply LEDs . . . . . 5b-4
Power Supply Distribution . . . . . . . . . . . . . . 5b-5
Contents4
.
5c Service Error Messages
6. Replaceable Parts
Introduction . . . . . . . . . . .......... 6-1
Assembly Replacements . . . . . . . . . . . . . . 6-1
7 . Adjustments
Internal Timebase Adjustment . . . . . . . . . . . . . 7-1
Recommended Equipment (or equivalent) . . . . . . 7-1
Procedure . . . . . . . . . . . . . . . . . . . . . 7-1
8 . Performance Tests
Calibration Cycle . . . . . . . . . . . . . . . . . . . 8-1
Required Test Equipment . . . . . . . . . . . . . . . 8-2
FM Accuracy Performance Test . . . . . . . . . . . 8-3
FM Distortion Performance Test . . . . . . . . . . . 8-4
A Accuracy Performance Test . . . . . . . . . . .
M 8-6
AM Distortion Performance Test . . . . . . . . . . . 8-7
Phase Modulation Accuracy Performance Test . . . . 8-9
Phase Modulation Distortion Performance Test . . . . 8-10
Residual FM Performance Test . . . . . . . . . . . . 8-12
Harmonics Performance Test . . . . . . . . . . . . 8-14
Spurious Performance Test . . . . . . . . . . . . . 8-15
DC FM Frequency Error Performance Test . . . . . . 8-16
RF Level Accuracy Performance Test . . . . . . . . . 8-17
CW Frequency Accuracy Performance Test (Option 1E5
Only) . . . . . . . . . . . . . . . . . . . . . . 8-18
Test Record . . . . . . . . . . . . . . . . . . . . 8-19
Index
Contents-5
Figures
2.1 . HP 8647A Status Register Model . . . . . . . . . . . 2-8
3.1 . Replacing the Fuse . . . . . . . . . . . . . . . . . 3-3
3.2 . Power Cable and Mains Plug . . . . . . . . . . . . 3-4
5a.1 . Simplified Block Diagram . . . . . . . . . . . . . . 5a-1
5b.1 . Removing the Fuse Housing . . . . . . . . . . . . . 5b-3
8.1 . FM Accuracy Equipment Setup . . . . . . . . . . . 8-3
8.2 . FM Distortion Equipment Setup . . . . . . . . . . . 8-4
8.3 . AM Accuracy Equipment Setup . . . . . . . . . . . 8-6
8.4 . AM Distortion Equipment Setup . . . . . . . . . . . 8-7
8.5 . Phase Modulation Distortion Equipment Setup . . . . 8-9
8.6 . Phase Modulation Distortion Equipment Setup . . . . 8-10
8.7 . Residual FM Equipment Setup . . . . . . . . . . . . 8-12
8.8 . Harmonics Equipment Setup . . . . . . . . . . . . 8-14
8.9 . Spurious Equipment Setup . . . . . . . . . . . . . 8-15
8.10 . DC F Frequency Error Equipment Setup . . . . . .
M 8-16
8.11 . RF Level Accuracy Equipment Setup . . . . . . . . 8-17
8.12 . CW Frequency Accuracy Equipment Setup . . . . . . 8-18
Thbles
2.1 . Programming Command Statements and Descriptions . 2-6
2.2 . Dictionary of Terms . . . . . . . . . . . . . . . . . 2-13
2.3 . IEEE 488.2 Capabilities . . . . . . . . . . . . . . . 2-21
3.1 . Voltage Ranges for Nominal Voltage Values . . . . . . 3-2
5a.1 . A1 Front Panel (keyboard) . . . . . . . . . . . . . 5a-3
6.1 . Replaceable Parts . . . . . . . . . . . . . . . . . . 6-2
8.1 . HP 8647A Test Record . . . . . . . . . . . . . . . 8-19
8.2 . HP 8647A Test Record . . . . . . . . . . . . . . . 8-20
8.3 . FM Accuracy Performance Test . . . . . . . . . . . 8-21
84 . FM Distortion Performance Test . . . . . . . . . . .
. 8-22
8.5 . AM Accuracy Performance Test . . . . . . . . . . . 8-23
8.6 . AM Distortion Performance Test . . . . . . . . . . . 8-25
8.7 . Phase Modulation Accuracy Performance Test . . . . 8-26
8.8 . Phase Modulation Distortion Performance Test . . . . 8-27
8.9 . Residual FM Performance Test . . . . . . . . . . . . 8-28
8.10 . Harmonics Performance Test . . . . . . . . . . . . 8-29
8.11 . Spurious Performance Test . . . . . . . . . . . . . 8-32
8.12 . DC FM Frequency Error Performance Test . . . . . . 8-33
8.13 . RF Level Accuracy Performance Test . . . . . . . . . 8-34
8.14 . CW Frequency Accuracy Performance Test (Option 1E5
Only) . . . . . . . . . . . . . . . . . . . . . . 8-39
Contents-6
1
Operation
"Operation" contains the following information:
1. Operation Provides a quick overview of the instrument's
operation.
la. Operation Provides examples to help you learn how to operate
Examples the instrument.
lb. Operation Provides quick access to information about each of
Reference the instrument's functions.
Operation Provides information about both front-panel and
Messages HP-IBremote operation messages.
Note For information about service messages numbered 500 and above,
refer to Chapter 5c, "Service Error Messages."
Operation 1.1
Quick Overview
1 2 3 4 6 7
1. Power Key Press ( m power-up the instrument. The instrument powers up
)
to
to the same state it was in when power was turned off, except that
the RF output will be turned off press the-f
1J key to turn it
on.
2. Display Contrast Display contrast is an adjustment that is located on the rear panel.
It allows you to adjust contrast for the front-panel display. Turn
the adjustment to optimize the display for viewing it from above,
below, or straight on. If the display is blank, first attempt to adjust
the display contrast adjustment before returning the instrument for
service.
3. Function and Data The keys in the FUNCTION and DATA blocks allow you to enter
Keys values for setting the frequency, amplitude, and modulation level of
the RF output signal.
4. Increment Set Keys When you press a FUNCTION key, that function becomes the active
function. PressS - [
) TE to view or change the increment value for
the active function. Press the or (TD key at any time to change the
active function setting by the increment value.
5. Knobs The knobs are always active when the instrument is in local (front
panel) control. Turn them to increase or decrease the frequency or
amplitude of the RF output. Press @ or
adjust the knob's resolution.
a, next to each knob, to
PressT),E (-S next to each knob, to set the displayed value as the
reference value and turn on the reference mode. Press CREF ON/OFF) 0
turn on and off the reference mode without changing the reference
value. When the reference mode is on, the displayed value indicates
the offset between the reference value and the RF output signal.
1-2 Operation
6. MEMORY Memory registers allow you to save instrument set-ups and recall
them whenever you wish. Press and enter a two-digit register
number to save the instrument's current settings. To recall the
settings, press and enter the register number. The arrow keys
allow you to recall registers in numerical sequence. You can arrange
your registers in up to ten different sequences.
The number of the currently selected sequence and the last register
selected are always displayed in the lower left corner of the display
to help you keep track of where you are in your testing process.
The memory register examples provided in Chapter la, "Operation
Examples," show you how to create a sequence and how to delete or
add registers in your sequence.
7 Modulation Source
. Press [MOD ON/OFF) to turn on or off the modulation source. Press
L m ] -
(
or 1 to select one of the internal source tones
for modulating the RF output signal. These tones are also available
as an output signal at the MOD INPUT/OUTPUT port when they are
selected. Press [m) or [EXTI to ac- or dc-couple an external
audio source via the MOD INPUT/OUTPUT port.
Press ( i k k + EXT DC) to frequency modulate the RF signal with
the internal 1 kHz tone and an external source at the same time.
(Additional internal plus external modulation capabilities are available
for HP-IB operation.)
Operation 1-3
la
Operation Examples
This section contains operating examples to help you learn how to
operate the signal generator. These examples can be performed
without any additional equipment.
Gmetting Started If this is the first time you have operated this instrument, perform
each of the following examples for a quick introduction to general
operation. After you have completed the examples, try operating the
instrument's remaining functions on your own. If you have trouble
or want additional information on a function, refer to Chapter lb,
"Operation Reference." If a message is displayed that you do not
understand, refer to Chapter IC, "Operation Messages."
Operation Examples 1. Setting the RF Output Signal
2. Incrementing or Decrementing the RF Output Signal
3. Using the Memory Registers
4. Offsetting the RF Output from a Reference
5 . Holding the Output Attenuator Range
1 2 3
4 5
Operation Examples la-1
Setting the RF In this example, you will set the frequency, amplitude, and modulation
level of the RF output signal.
Output Signal
Setting the Frequency 1. Set the frequency to 100 MHz using the keys shown below the
instrument diagram.
If you make a mistake while entering a value, press to correct
it.
functl .drw
Setting the Amplitude 2. Set the amplitude to -100 dBm.
funct2.dnv
la-2 Operation Examples
Turn on the RF Output 3. Press @KjiEF] turn on the RF output.
to
RF OFF is displayed below the amplitude setting when the RF
output is turned off.
MODULATION - AMPUTUDE
100.00000 MHz FM 3.00 kHz
rlJnd3.dlw
Setting the 4. Set the F deviation to 3 kHz.
M
Modulation The modulation rate is displayed below the deviation setting.
Use the MODULATION SOURCE keys when you wish to select a
modulation source and turn modulation on or off.
Operation Examples 1a-3
Incrementing or In this example, you will increment the amplitude and frequency of
the RF output signal.
Decrementing the
RF Output Signal
Preliminary Steps 1. If they are not already set, set the frequency to 100 MHz, and the
amplitude to -100 dBm.
FREQUENCY -
i MODULATION - AMPUT
Incrl.drw
Using the Knob 2. Increment the amplitude using the knob.
Press or when you wish to adjust the increment resolution.
100.00000 MHz -101.0 dBm
l a - 4 Operation Examples
Using the Increment 3. Enter a frequency increment of 25 kHz.
keys The $ symbol is displayed when you pressT_)E (-S to indicate
that the displayed value is the increment set value.
4. Increment the RF output frequency in 25 kHz steps.
The increment keys affect the last FUNCTION selected
(FREQUENCY, AMPLITUDE, FM, AM or 9M).
i FREOUENCY
100.02500 MHz
- - MODULATION AMPLITUDE
-101.0 dBm
.
J
m incr4.d~
Operation Examples la-5
Using the Memory The memory register examples show you how to create a sequence of
registers, delete a register from that sequence, renumber the registers
Registers in the sequence, and insert a new register in the sequence.
Up to 10 register sequences can be-defined (0 through 9). A sequence
can contain up to 100 registers (00 through 99). There are a total of
300 registers available in the instrument. The registers can be used
in the sequences in any combination (such as 10 sequences of 30
registers each, or 3 sequences of 100 registers each) as long as the
total does not exceed 300 registers. It is not possible to have all 10
sequences each contain 100 registers as that would be 1000 registers.
8,
tl J
-REG 99
300REG
1 a-6 Operation Examples
Saving Instrument In this ten step example, you will use the memory keys to create
Settings in Register a sequence containing three registers. Each register will contain a
Sequences different frequency setting.
Selecting the Sequence
1. Select sequence 0.
If there are registers saved in sequence 0, the message shown
in the display below will not appear. Note that the steps in this
example will cause the settings in registers 00, 01, and 02 of
sequence 0 to be changed.
regseql .dm
Saving Settings in Registers
2. Set the frequency to 10 MHz.
(,I]
,,.
3. Save the instrument settings in register 00.
10.00000 MHz
SEQ 0 REG 00
4. Set the frequency setting to 11 MHz.
Operation Examples la-7
regseq4.d~
5. Save the instrument settings in register 01.
regseq5.d~
6. Set the frequency to 12 MHz.
1a 4 Operation Examples
7. Save the instrument settings in register 02.
p- FREQUENCY
,
12.00000 MHz
SEQ 0 REG 02
- ' MODULATION - AMPLITUDE-
Checking the Sequence
8. Recall the registers in sequence 0.
The a and @ keys recall registers or sequences depending on
which key w s pressed last
a
J
(m
or ISEQ_)).
10.00000 MHz
regseq8.d~
Checking a Different Sequence
9. Select sequence 1.
Operation Examples 1a-9
10. Step through the registers in sequence 1 if there are registers
saved in it.
Note Sequence 1 does not contain the settings you saved in sequence
0. The instrument enables you to save different settings in each
sequence to create up to ten different sequences for your testing.
Remember when you save or recall a register, be sure that the correct
sequence is also selected.
SEQ 1 REG 00
req0.dnv
la-10 Operation Examples
Deleting a Register In this example, you will delete a register from the sequence you
from the Sequence created in the preceding example.
Selecting the Sequence
1. Select sequence 0.
\f
L
FREQUENCY '
SEQ 0
- MODULAllON - AMPLITUDE
1
d%lregO.drw
Deleting a Register
2. Delete register 01 from sequence 0.
Note The contents of the register are recalled when it is deleted. This
allows you to resave the contents if you need to.
FREQUENCY - - MODULATION AMP
delregl .drw
Operation Examples la-1 1
3. Step through the remaining registers in sequence 0.
The deleted register number has been removed from the sequence.
Note that the instrument does not renumber the registers when
one is deleted.
delreg2.d~
1a.12 Operation Examples
Renumbering the In this example, you will eliminate the skip from register 00 to register
Registers in a 02 in sequence 0 caused when you deleted register 01 in the previous
Sequence
Decreasing the Register Number
1. Delete register 02.
The settings saved in register 02 are recalled when it is deleted.
numseql.drw
2. Save the settings from register 02 into register 01.
Operation Examples la-13
Checking the Sequence
3. Step through the register sequence.
12.00000 MHz
10.00000 MHz
SEO 0 REG 00
Note In this example, you renumbered one register. When you need to
renumber two or more registers, use instead of a to recall
each register until you get to the last register in the sequence, then
use (DELI.
la-14 Operation Examples
Inserting a Register in In this example, you will insert a register into the sequence you
a Sequence created in the previous example. The process involves incrementing
each register number that comes after the point in the sequence
where you wish to insert a register.
1. Recall the last register in sequence 0.
12.00000 MHz
SEQ 0 REG 01
J
imeql .dm
2. Save the recalled settings into register 02.
insseu2.d~
3. Recall register 00.
Register 01 can now be used to save the settings that are saved in
register 00.
10.00000 MHz
SEQ 0 REG 00
Operation Examples la-15
4. Save the recalled settings into register 01.
Register 00 can now be used to save the new settings.
insseq4.d~
Saving a New Register
5. Set the frequency to 8 MHz.
6. Save the settings in register 00.
Press ato check the new sequence.
8.00000 MHz
SEQ 0 REG 00
la-16 Operation Examples
Offsetting the RF In this example, you will enter an RF output frequency, set it as the
reference value, and then offset the RF output frequency 10 MHz
Output from a below the reference value.
Reference
Setting the Reference 1. Set the frequency to 500 MHz.
Value
q@ I1
0
0/ u0 0 0
0
-
1 500.00000 MHz
ref1.dnv
2. Set 500 MHz as the reference frequency.
The A symbol appears in the display to indicate that the reference
mode is selected. The output frequency is still 500 MHz.
Operation Examples la-17
Offsetting the RF 3. Offset the output frequency 10 MHz below the reference
output frequency.
You can enter in the offset value directly, or use the knob or
and a keys.
Attention! In the reference mode, the output frequency equals the reference
frequency k the displayed offset frequency.
Turning the Reference Mode O f or On
f
4. Turn-off the reference mode to display the actual output
frequency.
490.00000 MHz
5. Turn-on the reference mode without changing the reference
frequency.
FREQUENCY 1
-
- 1O.OOOOOnMHz
MODULATION - AMPLITUDE
la-1 8 Operation Examples
6. Change the displayed units to kHz.
Note that for amplitude, reference settings are displayed in dB
units only.
Setting a New Reference Value
7. Set the current output frequency as the new reference frequency
at any time.
ref7.d~
Operation Examples la-19
Holding the Output In this example, you will hold the output attenuator so it does not
change ranges when you change the amplitude setting. This will
Attenuator Range prevent attenuator range changes from affecting the output signal.
Set the Amplitude 1. Set the amplitude level to -82 dBm.
Level
I -82.0 dBm
am1drw
Holding the 2. Hold the attenuator at this setting.
Attenuator
\f
\
FREOUENCY - - MODULATION AMPLITUDE
-82.0 dBm
HOLD
J
la-20 Operation Examples
Adjusting the 3. Adjust the amplitude setting.
Amplitude Now amplitude changes do not cause the attenuator to change its
range setting. Consequently, amplitude changes are limited to the
range provided by the instrument's vernier. For information about
the instrument's vernier ranges, refer to Chapter lb, "Operation
Reference. '
Operation Examples la-21
Ib
Operation Reference
This chapter describes each of the instrument's functions including all
of the front panel keys, the rear panel connectors, and the optional
remote interface and memory interface. This information is presented
in the same functional groups as the front panel key functional
groupings.
Operation Reference 1b-1
Frequency/Amplitude
Frequency and
Amplitude
1 2 3 4 ireqkeys.dm
The knob and reference set keys work similarly for both frequency
and amplitude.
1. Knob Turn the knobs to increment or decrement the frequency and
amplitude settings. The knobs are always active when the instrument
is in local operation.
2. Digit-Select Arrow Press these digit-select arrow keys (@ a)select the digit to be
to
Keys changed with the knob.
Note The knobs increment the selected digit only. For information about
incrementing by an arbitrary value using the increment set keys, see
"Increment Set" in this chapter.
lb-2 Operation Reference
Frequency/Amplitude
3. REF SET Press [ E )to turn on the reference mode and to set the current
R F
RF output setting as the reference value. The reference value
is stored in non-volatile memory until you replace it by pressing
( ES T
R F Eagain.)
When you pressT),E (-S the A symbol is displayed between the
value and the units. When A appears, the displayed value indicates
the offset between the reference value and the RF output signal.
The RF output signal is not changed when you press this key.
Units
When you press ( E ] frequency, values can be entered in MHz
R F for
or kHz. For amplitude, values can be entered in any of the amplitude
units provided, but they are displayed in dB only.
4. REF ON/OFF Press [REF ON/OFF] turn off the reference mode if it is on, or to turn
to
on the reference mode without changing the reference value.
When you turn on the reference mode, the displayed value indicates
the offset between the reference value and the current RF output
setting.
The RF output signal is not changed when you press this key.
Output Power If the RF output power seems too low, look for A in the display
Trouble? between the power level value and the dB indicator. The A tells you
that reference mode is turned on. The displayed value is not the
output power level; it is the offset between the reference value and
the output power. To exit the reference mode, press CREF O N / O F F ~ . You
can then reset the output power to the desired level.
Operation Reference 1b-3
Function
Function
1
1. FREQUENCY The RF output frequency range is 250 kHz to 1000 MHz. When
making frequency changes, the instrument does not turn off the RF
output.
Frequency switching typically takes less than 120 ms. Worst case
conditions occur for changes which cross the instrument's two
frequency band edges (249 MHz and 501 MHz).
2. AMPLITUDE The RF output amplitude range is -136 dBm to + 10 dBm with
over-range to + 13 dBm. When making amplitude changes, the
instrument does not turn off the RF output. The electronic attenuator
provides rapid amplitude changes. The period of any over- or
under-ranging that may occur during level transitions is typically less
than 30 ms.
3. FM Press IFM_) to set the peak deviation for frequency modulation. Then
AM use the data entry keys to enter the desired value of deviation. The
values allowed depend on the RF frequency selected. See Chapter 4,
4M "Specifications" for peak deviation specifications.
Press IAM) to set the amplitude modulation range. Then use the data
entry keys to set the desired value of range. Values from 0 through
100% are allowed.
Press @ to set the peak deviation for phase modulation. Then use
K J
the data entry keys to enter the desired value of deviation. The
values allowed depend on the RF frequency selected. See Chapter 4,
"Specifications" for peak deviation specifications.
lb.4 Operation Reference
Increment Set
INCREMENT SET
incrkays.dw
1. INCR SET PressNI (
J-R
C to view or change the increment set value for the
currently active function (the active function is the last function key
you press; I ]
-, -
,I[ m,m),m). or When you
press @ E S T, is displayed between the value and the units. The $
F T E f)J
indicates that the displayed value is the increment set value.
Note An increment value cannot be set for the knobs or the memory recall
arrow keys.
Function Range
Frequency 1 Hz to 999.75 MHz
Amplitude > 0.0 to 149.0 dB
FM Deviation > 0.0 to 100 kHz
AM Depth > 0.0 to 100%
4M Deviation >O.O to 10.0 Radians
Note It is possible to set an increment value of greater resolution than can
be displayed or than the hardware can respond to. However, the
instrument records each arrow k◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo