Anritsu 681 C Series User manual

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SERIES
681XXC
SYNTHESIZED SIGNAL GENERATOR
OPERATION MANUAL
P/N: 10370-10333
REVISION: B
PRINTED: APRIL 2001
COPYRIGHT 1999 ANRITSU CO.
490 JARVIS DRIVE
MORGAN HILL, CA 95037-2809

WARRANTY
The Anritsu product(s) listed on the title page is (are) warranted against defects in materials and
workmanship for one year from the date of shipment.
Anritsu’s obligation covers repairing or replacing products which prove to be defective during the
warranty period. Buyers shall prepay transportation charges for equipment returned to Anritsu for
warranty repairs. Obligation is limited to the original purchaser. Anritsu is not liable for conse-
quential damages.
LIMITATION OF WARRANTY
The foregoing warranty does not apply to Anritsu connectors that have failed due to normal wear.
Also, the warranty does not apply to defects resulting from improper or inadequate maintenance by
the Buyer, unauthorized modification or misuse, or operation outside of the environmental specifi-
cations of the product. No other warranty is expressed or implied, and the remedies provided herein
are the Buyer’s sole and exclusive remedies.
TRADEMARK ACKNOWLEDGEMENTS
Adobe Acrobat is a registered trademark of Adobe Systems Incorporated.
NOTICE
Anritsu Company has prepared this manual for use by Anritsu Company personnel and customers
as a guide for the proper installation, operation, and maintenance of Anritsu Company equipment
and computor programs. The drawings, specifications, and information contained herein are the
property of Anritsu Company, and any unauthorized use or disclosure of these drawings, specifica-
tions, and information is prohibited; they shall not be reproduced, copied, or used in whole or in part
as the basis for manufacture or sale of the equipment or software programs without the prior writt-
ten consent of Anritsu Company.

Safety Symbols
To prevent the risk of personal injury or loss related to equipment malfunction, Anritsu Company uses the
following symbols to indicate safety-related information. For your own safety, please read the information
carefully BEFORE operating the equipment.
WARNING WARNING indicates a hazard. It calls attention to a procedure that
could result in personal injury or loss of life if not performed properly.
Do not proceed beyond a WARNING notice until the indicated condi-
tions are fully understood and met.
CAUTION CAUTION indicates a hazard. It calls attention to a procedure which,
if not performed properly, could result in damage to or destruction of a
component of the instrument. Do not proceed beyond a CAUTION note
until the indicated conditions are fully understood and met.
The instrument is marked with this symbol to indicate that it is neces-
sary for the user to refer to the instructions in the operation manual.
Indicates ground.
Indicates heavy weight equipment.
681XXC OM Safety-1

Safety-2 681XXC OM
There are no operator serviceable components inside. Refer
servicing of the instrument to qualified service technicians.
To prevent the risk of electrical shock or damage to precision
components, do not remove the equipment covers.
WARNING
When supplying power to this equipment, always use a
three-wire power cable connected to a three-wire power line
outlet. If power is supplied without grounding the equip-
ment in this manner, there is a risk of receiving a severe or
fatal electric shock.
WARNING
For Safety
Before changing the fuse, always remove the power cord
from the power outlet. There is the risk of receiving a fatal
electric shock if the fuse is replaced with the power cord
connected.
Always use a new fuse of the type and rating specified by
the fuse markings on the rear panel of the instrument.
WARNING
Use two or more people to lift and move this equipment, or
use an equipment cart. There is a risk of back injury, if this
equipment is lifted by one person.
WARNING
If the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment
may be impaired.
WARNING

Table of Contents
Chapter 1 General Information
1-1 SCOPE OF MANUAL.................1-3
1-2 INTRODUCTION ...................1-3
1-3 DESCRIPTION ....................1-3
1-4 IDENTIFICATION NUMBER ............1-5
1-5 ELECTRONIC MANUAL...............1-5
1-6 RELATED MANUALS ................1-5
GPIB Programming Manual ...........1-5
SCPI Programming Manual ...........1-5
Maintenance Manual ..............1-6
1-7 OPTIONS .......................1-6
1-8 PERFORMANCE SPECIFICATIONS ........1-7
1-9 RECOMMENDED TEST EQUIPMENT .......1-8
Chapter 2 Installation
2-1 INTRODUCTION ...................2-3
2-2 INITIAL INSPECTION ................2-3
2-3 PREPARATION FOR USE ..............2-4
Power Requirements...............2-4
Line Voltage Selection ..............2-4
Power Connection ................2-4
Standby Operation................2-5
Warmup Time ..................2-6
Operating Environment .............2-6
2-4 GPIB SETUP AND INTERCONNECTION .....2-7
Interface Connector ...............2-7
Cable Length Restrictions ............2-7
GPIB Interconnection ..............2-7
Setting the GPIB Address ............2-7
Selecting the Line Terminator ..........2-9
Selecting the Interface Language.........2-9
2-5 RACK MOUNTING KIT INSTALLATION .....2-10
Preliminary ..................2-10
Procedure ...................2-10
681XXC OM i

2-6 PREPARATION FOR STORAGE/SHIPMENT . . . 2-13
Preparation for Storage.............2-13
Preparation for Shipment............2-13
Chapter 3 Local (Front Panel) Operation
3-1 INTRODUCTION ...................3-5
3-2 FRONT PANEL LAYOUT...............3-6
Line Key ....................3-6
Data Display Area ................3-6
Data Entry Area.................3-7
RF Output Control Key .............3-7
Connectors ...................3-7
3-3 DATA DISPLAY AREA ................3-8
Menu Display Format ..............3-9
Menu Keys ...................3-10
3-4 DATA ENTRY AREA.................3-12
3-5 INSTRUMENT START-UP .............3-14
Powering Up the 681XXC............3-14
Start-Up Display ................3-14
Standby Operation ...............3-14
Self-Testing the 681XXC ............3-15
Resetting to Default Parameters ........3-15
3-10 POWER LEVEL SWEEP OPERATION.......3-53
Selecting CW Power Sweep Mode ........3-53
Setting CW Power Sweep Step Size and Dwell Time3-54
Selecting a CW Power Sweep Trigger ......3-55
Selecting a Power Level Sweep Range......3-56
Selecting a Sweep Frequency/Step Power Mode . 3-58
Setting Power Level Step Size .........3-59
3-11 LEVELING OPERATIONS .............3-60
Selecting a Leveling Mode ...........3-60
Attenuator Decoupling .............3-64
ALC Power Slope................3-65
User Cal (User Level Flatness Correction) . . . 3-67
3-12 SIGNAL MODULATION ..............3-73
Amplitude Modulation Operating Modes ....3-73
Providing Amplitude Modulation ........3-73
ii 681XXC OM
Table of Contents (Continued)

Frequency Modulation Operating Modes ....3-74
Providing Frequency Modulation ........3-75
Square Wave Modulation Operating Modes . . . 3-77
Providing Square Wave Modulation .......3-77
3-13 SYSTEM CONFIGURATION ............3-80
Configuring the Front Panel ..........3-81
Configuring the Rear Panel...........3-82
Configuring the RF ...............3-83
Configuring the GPIB .............3-85
Setting Increment Sizes ............3-88
3-14 SAVING/RECALLING INSTRUMENT SETUPS . 3-89
Saving Setups .................3-89
Recalling Setups ................3-89
Erasing Stored Setups .............3-90
3-15 SECURE OPERATION ...............3-91
3-16 REFERENCE OSCILLATOR CALIBRATION . . . 3-92
Chapter 4 Local Operation–Menu Maps
4-1 INTRODUCTION ...................4-3
4-2 MENU MAP DESCRIPTION .............4-3
Chapter 5 Operation Verification
5-1 INTRODUCTION ...................5-3
5-2 TEST EQUIPMENT..................5-3
5-3 TEST RECORDS ...................5-3
5-4 INITIAL 681XXC CHECKOUT............5-4
Power Up ....................5-4
Self Test.....................5-4
Resetting the 681XXC ..............5-4
Warmup Time ..................5-4
5-5 CW FREQUENCY ACCURACY TEST........5-5
Test Setup....................5-5
Test Procedure..................5-6
5-6 POWER LEVEL ACCURACY AND FLATNESS
TESTS ........................5-13
Test Setup ...................5-13
681XXC OM iii
Table of Contents (Continued)

Power Level Accuracy Test Procedure ......5-14
Power Level Flatness Test Procedure ......5-15
Chapter 6 Operator Maintenance
6-1 INTRODUCTION ...................6-3
6-2 ERROR AND WARNING/STATUS MESSAGES. . . 6-3
Self-Test Error Messages.............6-3
Normal Operation Error and Warning/ Status
Messages ....................6-8
6-3 TROUBLESHOOTING ...............6-10
6-4 ROUTINE MAINTENANCE ............6-13
Cleaning the Fan Filter.............6-13
Cleaning the Data Display ...........6-13
Replacing the Line Fuse ............6-14
Chapter 7 Use With Other Instruments
7-1 INTRODUCTION ...................7-3
7-2 MASTER-SLAVE OPERATION ...........7-4
Connecting the Instruments ...........7-4
Initiating Master-Slave Operation ........7-5
Master-Slave Operation .............7-7
Master-Slave Operation in VNA Mode ......7-7
Terminating Master-Slave Operation .......7-9
7-3 USE WITH A 56100A SCALAR NETWORK
ANALYZER......................7-10
Connecting the 681XXC to the 56100A .....7-10
7-4 USE WITH A 360B VECTOR NETWORK
ANALYZER......................7-11
Connecting the 681XXC to the 360B ......7-11
Modes of Operation...............7-12
Source Lock Mode ...............7-12
Tracking Mode .................7-14
7-5 USE WITH A HP8757D SCALAR NETWORK
ANALYZER......................7-16
Connecting the 681XXC to the HP8757D ....7-16
Setting Up the 681XXC.............7-17
Initiating HP8757D SNA Operation.......7-19
iv 681XXC OM
Table of Contents (Continued)

Appendix A Rear Panel Connectors
A-1 INTRODUCTION...................A-1
A-2 REAR PANEL CONNECTORS ...........A-1
A-3 CONNECTOR PINOUT DIAGRAMS ........A-1
Appendix B Performance Specifications
681XXC OM v/vi
Table of Contents (Continued)

Table of Contents (Continued)

Table of Contents
1-1 SCOPE OF MANUAL.................1-3
1-2 INTRODUCTION ...................1-3
1-3 DESCRIPTION ....................1-3
1-4 IDENTIFICATION NUMBER ............1-5
1-5 ELECTRONIC MANUAL...............1-5
1-6 RELATED MANUALS ................1-5
GPIB Programming Manual ...........1-5
SCPI Programming Manual ...........1-5
Maintenance Manual ..............1-6
1-7 OPTIONS .......................1-6
1-8 PERFORMANCE SPECIFICATIONS ........1-7
1-9 RECOMMENDED TEST EQUIPMENT .......1-7
Chapter 1
General Information

Figure 1-1. Series 681XXC Synthesized Signal Generator

Chapter 1
General Information
1-1 SCOPE OF MANUAL This manual provides general information, installation, and operating
information for the Anritsu Series 681XXC Synthesized Signal Gen-
erator. (Throughout this manual, the terms 681XXC and signal gen-
erator will be used interchangeably to refer to the instrument.) Man-
ual organization is shown in the table of contents.
1-2 INTRODUCTION This chapter contains general information about the series 681XXC
signal generators. It includes a general description of the instrument
and information on its identification number, related manuals, op-
tions, and performance specifications. A listing of recommended test
equipment is also provided.
1-3 DESCRIPTION The Series 681XXC Synthesized Signal Generators are microproces-
sor-based, synthesized signal sources with high resolution phase-lock
capability. They generate both broad (full range) and narrow band
sweeps and discrete CW frequencies across the frequency range of
10 MHz to 65 GHz. All functions of the signal generator are fully con-
trollable locally from the front panel or remotely (except for power
on/standby) via the IEEE-488 General Purpose Interface Bus (GPIB).
The series presently consists of seven models covering a variety of fre-
quency and power ranges. Table 1-1, page 1-4, lists models, frequency
ranges, and maximum leveled output.
681XXC OM 1-3

1-4 681XXC OM
681XXC
Model Frequency Output Power Output Power w/Step Attenuator
Output Power
w/Electronic
Step Attenuator
68117C 0.01 – 8.4 GHz +13.0 dBm +11.0 dBm +9.0 dBm
68137C 2.0 – 20.0 GHz +13.0 dBm +11.0 dBm +3.0 dBm
68147C 0.01 – 20.0 GHz +13.0 dBm +11.0 dBm +3.0 dBm
68167C 0.01 – 2.0 GHz 2.0 – 20.0 GHz
20.0 – 40.0 GHz
+13.0 dBm
+9.0 dBm
+6.0 dBm
+11.0 dBm
+7.0 dBm
+3.0 dBm Not Available
68177C
0.01 – 2.0 GHz
2.0 – 20.0 GHz
20.0 – 40.0 GHz
40.0 – 50.0 GHz
+11.0 dBm
+10.0 dBm
+2.5 dBm
+2.5 dBm
+10.0 dBm
+8.5 dBm
0.0 dBm
–1.0 dBm
Not Available
68187C
0.01 – 2.0 GHz
2.0 – 20.0 GHz
20.0 – 40.0 GHz
40.0 – 50.0 GHz
50.0 – 60.0 GHz
+11.0 dBm
+10.0 dBm
+2.5 dBm
+2.0 dBm
+2.0 dBm
+10.0 dBm
+8.5 dBm
0.0 dBm
–1.5 dBm
–2.0 dBm
Not Available
68197C
0.01 – 2.0 GHz
2.0 – 20.0 GHz
20.0 – 40.0 GHz
40.0 – 50.0 GHz
50.0 — 65.0 GHz
+11.0 dBm
+10.0 dBm
+2.5 dBm
0.0 dBm
–2.0 dBm
Not Available Not Available
With Option 15A (High Power) Installed
68117C 0.01 – 2.0 GHz
2.0 – 8.4 GHz +13.0 dBm +17.0 dBm +11.0 dBm +15.0 dBm +11.0 dBm +11.0 dBm
68137C 2.0 – 20.0 GHz +17.0 dBm +15.0 dBm +7.0 dBm
68147C 0.01 – 2.0 GHz
2.0 – 20.0 GHz +13.0 dBm +17.0 dBm +11.0 dBm +15.0 dBm +11.0 dBm +7.0 dBm
68167C 0.01 – 20.0 GHz
20.0 – 40.0 GHz +13.0 dBm +6.0 dBm +11.0 dBm +3.0 dBm Not Available
68177C 0.01 – 50.0 GHz Standard Standard Not Available
68187C 0.01 – 60.0 GHz Standard Standard Not Available
Table 1-1. Series 681XXC Models
GENERAL 681XXC
INFORMATION MODELS
Note: In models with Option 22 that have a high-end frequency of £20 GHz, rated output power is reduced by 1 dB
In models with Option 22 that have a high-end frequency of >20 GHz, rated output power is reduced by 2 dB.

1-4 IDENTIFICATION
NUMBER All Anritsu instruments are assigned a unique six-digit ID number, such as “875012”. The ID number is imprinted on a decal that is af-
fixed to the rear panel of the unit. Special-order instrument configura-
tions also have an additional special serial number tag attached to the
rear panel of the unit.
When ordering parts or corresponding with Anritsu Customer Service,
please use the correct serial number with reference to the specific in-
strument’s model number (i.e., Model 68147C Synthesized Signal Gen-
erator, Serial No. 875012).
1-5 ELECTRONIC MANUAL This manual is available on CD ROM as an Adobe Acrobat Portable
Document Format (*.pdf) file. The file can be viewed using Acrobat
Reader, a free program that is also included on the CD ROM. The file
is “linked” such that the viewer can choose a topic to view from the
displayed “bookmark” list and “jump” to the manual page on which the
topic resides. The text can also be word-searched. Contact Anritsu
Customer Service for price and availability.
1-6 RELATED MANUALS This is one of a four manual set that consists of an Operation Manual,
a GPIB Programming Manual, a SCPI Programming Manual, and a
Maintenance Manual.
GPIB Pro-
gramming
Manual
This manual provides information for remote opera-
tion of the signal generator with 681XXC Product
Specific commands sent from an external controller
via the IEEE 488 General Purpose Interface Bus
(GPIB). It contains a general description of the
GPIB and bus data transfer and control functions, a
complete listing and description of all 681XXC GPIB
Product Specific commands, and several program-
ming examples. The Anritsu part number for the
GPIB Programming Manual is 10370-10334.
SCPI Pro-
gramming
Manual
This manual provides information for remote opera-
tion of the signal generator with Standard Com-
mands for Programmable Instruments (SCPI)
commands sent from an external controller via the
IEEE 488 General Purpose Interface Bus (GPIB). It
contains a general description of the GPIB and bus
data transfer and control functions, a complete list-
ing and description of each command in the 681XXC
SCPI command set, and examples of command us-
age. The Anritsu part number for the SCPI Pro-
gramming Manual is 10370-10335.
681XXC OM 1-5
GENERAL IDENTIFICATION
INFORMATION NUMBER

Maintenance
Manual The Maintenance Manual supplies service informa-
tion for all models in the 681XXC series. The service
information includes functional circuit descriptions,
block diagrams, performance verification tests, cali-
bration procedures, troubleshooting data, and as-
sembly and component removal/replacement
procedures. The Anritsu part number for the Main-
tenance Manual is 10370-10336.
1-7 OPTIONS The following options are available.
Option 1, Rack Mounting. Rack mount kit containing a set of
track slides (90°tilt capability), mounting ears, and front panel han-
dles for mounting the instrument in a standard 19-inch equipment
rack.
Option 2A, 110 dB Step Attenuator. Adds a 10 dB per step
attenuator with a 110 dB range for models having a high-end fre-
quency of £20 GHz. Output power is selected directly in dBm on the
front panel (or via GPIB). Rated RF output power is reduced.
Option 2B, 110 dB Step Attenuator. Adds a 10 dB per step
attenuator with a 110 dB range for models having a high-end fre-
quency of £40 GHz. Output power is selected directly in dBm on the
front panel (or via GPIB). Rated RF output power is reduced.
Option 2C, 90 dB Step Attenuator. Adds a 10 dB per step
attenuator with a 90 dB range for models having a high-end fre-
quency of £50 GHz. Output power is selected directly in dBm on the
front panel (or via GPIB). Rated RF output power is reduced.
Option 2D, 90 dB Step Attenuator. Adds a 10 dB per step
attenuator with a 90 dB range for models having a high-end fre-
quency of £60 GHz. Output power is selected directly in dBm on the
front panel (or via GPIB). Rated RF output power is reduced.
Option 2E, 120 dB Electronic Step Attenuator. Addsa10dB
per step electronic attenuator with a 120 dB range for models hav-
ing a high-end frequency of £8.4 GHz. Output power is selected di-
rectly in dBm on the front panel (or via GPIB). Rated RF output
power is reduced.
Option 2F, 120 dB Electronic Step Attenuator. Addsa10dB
per step electronic attenuator with a 120 dB range for models hav-
ing a high-end frequency of £20 GHz. Output power is selected di-
rectly in dBm on the front panel (or via GPIB). Rated RF output
power is reduced.
Option 9, Rear Panel RF Output. Moves the RF output connector
to the rear panel.
Option 11, 0.1 Hz Frequency Resolution. Provides frequency
resolution of 0.1 Hz.
1-6 681XXC OM
GENERAL
INFORMATION OPTIONS

Option 14, Rack Mounting without Chassis Slides. Modifies
rack mounting hardware to install unit in a console that has mount-
ing shelves. Includes mounting ears and front panel handles.
Option 15A, High Power Output. Adds high-power RF compo-
nents to the instrument providing increased RF output power in the
2–20 GHz frequency range. Option 15A is standard in models hav-
ing a high-end frequency that is >40 GHz.
Option 16, High-Stability Time Base. Adds an ovenized, 10 MHz
crystal oscillator with <5 x 10–10/day frequency stability.
Option 17A, No Front Panel. Deletes the front panel for use in re-
mote control applications where a front panel display or keyboard
control are not needed.
Option 18, mmWave Module Bias Output. Provides bias output
for 54000-xWRxx Millimeter Wave Source Modules. BNC Twinax
connector, rear panel.
Option 19, SCPI Programmability. Adds GPIB command mne-
monics complying with Standard Commands for Programmable In-
struments (SCPI), Version 1993.0. SCPI programming complies with
IEEE 488.2-1987.
Option 22, 0.1 Hz to 10 MHz Audio Frequency. Adds frequency
coverage below 10 MHz. In models having a high-end frequency of
£20 GHz, rated output power is reduced by 1 dB; in models having a
high-end frequency of >20 GHz, rated output power is reduced by
2 dB.
1-8 PERFORMANCE
SPECIFICATIONS Series 681XXC Synthesized Signal Generator performance specifica- tions are provided in Appendix B.
681XXC OM 1-7
GENERAL PERFORMANCE
INFORMATION SPECIFICATIONS

1-9 RECOMMENDED TEST
EQUIPMENT Table 1-2 lists the recommended test equipment for performing the Se- ries 681XXC Synthesized Signal Generator operation verification tests
in Chapter 5.
1-8 681XXC OM
Instrument Critical Specification Recommended Manufacturer/Model
Frequency
Counter,
with
Cable Kit
and
External Mixer
Range: 0.01 to 65 GHz
Input Z: 50W
Resolution: 1Hz
Other: External Time Base
Input
EIP Microwave, Inc. Models 538B,
548B, or 578B,
with
Cable Kit: Option 590
and
External Mixer:
Option 91 (26.5 to 40 GHz)
Option 92 (40 to 60 GHz)
Option 93 (60 to 90 GHz)
Power Meter,
with
Power
Sensors
Range: –30 to +20 dBm
(1 mW to 100 mW) Anritsu Model ML2437A or ML2438A, with
Power Sensors:
MA2474A (0.01 to 40 GHz)
MA2475A (0.01 to 50 GHz)
Oscilloscope Bandwidth: DC to 150 MHz
Vertical Sensitivity: 2 mV/
division
Horiz Sensitivity: 50 ns/
division
Tektronix, Inc. Model TAS485
Table 1-2. Recommended Test Equipment
GENERAL RECOMMENDED
INFORMATION TEST EQUIPMENT