681XXC
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 toAnritsu 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 resultingfrom improper or inadequate maintenance by
the Buyer, unauthorized modification or misuse, or operation outside of the environmental specifi-
cations of theproduct. No other warranty isexpressed or implied,and the remediesprovided 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 informationis prohibited; they shallnot be reproduced,copied, or used inwhole or inpart
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 56100ASCALAR 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. Alisting 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 +11.0dBm +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
+11.0dBm
+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
+11.0dBm
+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
+11.0dBm
+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
+11.0dBm
+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
+11.0dBm
+15.0 dBm
+11.0dBm
+11.0dBm
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
+11.0dBm
+15.0 dBm
+11.0dBm
+7.0 dBm
68167C
0.01 – 20.0 GHz
20.0 – 40.0 GHz
+13.0 dBm
+6.0 dBm
+11.0dBm
+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 ML2437Aor 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
Table of Contents
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
2-6 PREPARATION FOR STORAGE/SHIPMENT . . . 2-13
Preparation for Storage.............2-13
Preparation for Shipment............2-13
Chapter 2
Installation
Chapter 2
Installation
2-1 INTRODUCTION This chapter provides installation instructions for the Series 681XXC
Synthesized Signal Generator. It includes information on initial in
-
spection, preparation for use, storage, and reshipment, and General
Purpose Interface Bus (GPIB) setup and interconnections.
2-2 INITIAL INSPECTION Inspect the shipping container for damage. If the shipping container or
cushioning material is damaged, retain until the contents of the ship-
ment have been checked against the packing list and the signal gen-
erator has been checked for mechanical and electrical operation.
If the shipment is incomplete or if the signal generator is damaged
mechanically or electrically, notify your local sales representative or
Anritsu Customer Service. If either the shipping container is damaged
or the cushioning material shows signs of stress, notify the carrier as
well as Anritsu. Keep the shipping materials for the carrier’s inspec
-
tion.
681XXC OM 2-3
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
2-3 PREPARATION FOR USE Preparation for use consists of checking that the rear panel line volt
-
age selector switch is set for the correct line voltage and connecting
the signal generator to the power source. The following paragraphs
provide these procedures along with information about power require
-
ments, warmup times, and the operating environment.
Power
Requirements
The signal generator accepts 90 to 132 Vac and 180
to 264 Vac, 48 to 440 Hz, single-phase power. Power
consumption is 400 VA maximum. The signal gen
-
erator is intended for Installation Category (Over
-
voltage Category) II.
Line Voltage
Selection
The line voltage selector switch on the rear panel
can be set for either 110 Vac or 220 Vac operation
(Figure 2-1). When the switch is set to 110 Vac, the
681XXC accepts 90 to 132 Vac line voltage. When
the switch is set to 220 Vac, the 681XXC accepts 180
to 264 Vac line voltage. If the selector setting is in-
correct for the line voltage available, change it to
the correct setting.
Whenever the selector setting is changed, the line
fuse must be changed to the correct value for the
line voltage selected. Line fuse values for the line
voltages are printed on the rear panel next to the
fuse holder.
Power
Connection
Connecting the 681XXC to line power automatically
places it in operation (front panel OPERATE LED
on). To connect it to the power source, plug the fe
-
male end of the power cable into the input line volt
-
age receptacle on the rear panel (Figure 2-1). Then
plug the male end of the power cord into a three-
wire power line outlet.
2-4 681XXC OM
PREPARATION
INSTALLATION FOR USE
Before applying power, verify that the unit is set to match
the available line voltage and that the installed fuse is of
the correct type and rating.
CAUTION
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
Standby
Operation
Whenever the signal generator is not being used it
should be left connected to the power source and
placed in standby. This keeps the internal timebase
frequency reference at operating temperature.
On the front panel, press LINE to switch the
681XXC from OPERATE (green LED on) to
STANDBY (orange LED on).
NOTE
During standby operation, the fan runs
continuously.
681XXC OM 2-5
PREPARATION
INSTALLATION FOR USE
LINE
OPERATE
STANDBY
SYSTEM
MODULATION
LEVEL
CONTROL
Line
Key
Line Voltage
Selector Switch
Line
Fuse
GPIB
Connector
Figure 2-1. Signal Generator Rear Panel showing Power Connection
Warmup Time
From Standby–When placing the 681XXC in op
-
eration from stand-by, allow 30 minutes warmup to
assure stable operation.
From a Cold Start (0°C)–The signal generator re
-
quires approximately 120 hours (5 days) of warm up
to achieve specified frequency stability with aging.
NOTE
Instruments disconnected from AC power
for more than 72 hours require 30 days to
return to specified aging.
Operating
Environment
The 681XXC can be operated within the following
environmental limits.
q
Temperature. 0°Cto50°C.
q
Humidity. 5 to 95% relative at 40°C.
q
Altitude. up to 4600 meters.
q
Cooling. Internal cooling is provided by forced
airflow from the fan mounted on the rear
panel.
2-6 681XXC OM
PREPARATION
INSTALLATION FOR USE
Before installing the 681XXC in its operating environment,
ensure that all airflow passages at the sides and rear of the
instrument are clear. This is of particular importance when-
ever the unit is being rack-mounted.
Keep the cooling fan filter clean so that the ventilation holes
are not obstructed. A blocked fan filter can cause the instru
-
ment to overheat and shut down.
CAUTION
2-4 GPIB SETUP AND
INTERCONNECTION
The 681XXC provides automated microwave signal generation via the
GPIB. The following paragraphs provide information about interface
connections, cable requirements, setting the GPIB operating parame
-
ters, and selecting the external interface language.
Interface
Connector
Interface between the signal generator and other de
-
vices on the GPIB is via a 24-wire interface cable.
This cable uses connector shells having two connec
-
tor faces. These double-faced connectors allow for
the parallel connection of two or more cables to a
single device. Figure 2-1 shows the location of the
rear panel GPIB connector.
Cable Length
Restrictions
The GPIB can accommodate up to 15 instruments at
any one time. To achieve design performance on the
bus, proper timing and voltage level relationships
must be maintained. If either the cable length be
-
tween separate instruments or the cumulative cable
length between all instruments is too long, the data
and control lines cannot be driven properly and the
system may fail to perform. Cable length restric-
tions are as follows:
q
No more than 15 instruments may be installed
on the bus.
q
Total cumulative cable length in meters may
not exceed two times the number of bus instru-
ments or 20 meters—whichever is less.
NOTE
For low EMI applications, the GPIB cable
should be a fully shielded type, with
well-grounded metal-shell connectors
GPIB Inter
-
connection
The only interconnection required for GPIB opera
-
tion is between the signal generator and the control
-
ler. This interconnection is via a standard GPIB
cable. The Anritsu Part number for such a cable is
2000-1, -2, or -4 (1, 2, or 4 meters in length).
Setting the
GPIB Address
The default GPIB address is 5. If a different GPIB
address is desired, it can be set from the front panel
using the Configure GPIB Menu.
To change the GPIB address, first press the front
panel main menu key labeled SYSTEM . The Sys
-
tem Menu (shown on the following page) is dis
-
played.
681XXC OM 2-7
GPIB SETUP AND
INSTALLATION INTERCONNECTION
Now press the menu soft-key Config . The System
Configuration Menu (below) is displayed.
To go to the Configure GPIB menu from this menu,
press the menu soft-key GPIB . The Configure GPIB
Menu (below) is displayed.
Press the menu soft-key GPIB Address to change
the current GPIB address of the signal generator.
Enter a new address using the cursor control key or
the data entry keypad and the terminator key
Hz
ns
ADRS
The new GPIB address will now appear on the dis
-
play. The entry must be between 1 and 30 to be rec
-
ognized as a valid GPIB address.
2-8 681XXC OM
GPIB SETUP AND
INSTALLATION INTERCONNECTION
Selecting the
Line
Terminator
Data is delimited on the GPIB by either the carriage
return (CR) ASCII character or both the carriage re
-
turn and line feed (CR/LF) ASCII characters. Which
character is used depends upon the requirements of
the system controller. Most modern controllers can
use either CR or CR/LF, while many older control
-
lers require one or the other. Consult the controller’s
manual for its particular requirements.
From the Configure GPIB Menu display, you can se
-
lect which GPIB terminator to use by pressing the
menu soft-key Line Term . This menu soft-key tog
-
gles the GPIB terminator between CR and CR/LF.
The current selection appears on the display.
Selecting the
Interface
Language
Series 681XXC Synthesized Signal Generators can
be remotely operated via the GPIB using one of two
external interface languages—Native or SCPI (Op
-
tion 19). The Native interface language uses a set of
681XXC GPIB Product Specific commands to control
the instrument; the SCPI interface language uses a
set of the Standard Commands for Programmable
Instruments commands to control the unit.
The Configure GPIB Menu has additional menu dis-
plays. For instruments with Option 19, selection of
which external interface language is to be used is
made from this additional menu. From the Config-
ure GPIB Menu display, you can access the first
additional menu by pressing More . The first Addi
-
tional Configure GPIB Menu (below) is displayed.
Press Native SCPI to select the external interface
language to be used. This menu soft-key toggles the
language selection between Native and SCPI. The
current selection appears on the display.
681XXC OM 2-9
GPIB SETUP AND
INSTALLATION INTERCONNECTION
2-5 RACK MOUNTING KIT
INSTALLATION
The rack mounting kit (Option 1) contains a set of track slides (90° tilt
capability), mounting ears, and front panel handles for mounting the
signal generator in a standard equipment rack. The following proce
-
dure provides instructions for installing the rack mounting hardware
on to the instrument. Refer to Figures 2-2 and 2-3 during this proce
-
dure.
Preliminary Disconnect the power cord and any other cables
from the instrument.
Procedure Install the rack mounting hardware as follows:
Step 1 Using a Phillips screwdriver, remove the
screws and the front handle assemblies
from the instrument. (For instruments
not having front handles, remove the
screws and the front top and bottom feet
from the instrument.) Retain the screws.
Step 2 Remove the four feet from the rear of the
instrument. Retain the screws.
Step 3 Remove the screws and the carrying han-
dle from the side handle cover. (The two
screws fastening the carrying handle
through the side handle cover to the chas-
sis are accessable by lifting up the rubber
covering at each end of the handle.)
2-10 681XXC OM
RACK MOUNTING KIT
INSTALLATION INSTALLATION
Figure 2-2. Front Handle, Feet, and Carrying Handle Removal
Step 4 Remove the inner slide assemblies from
the outer slide assemblies.
Step 5 Place the left side inner slide assembly
onto the instrument case with the handle
towards the front of the instrument (Fig
-
ure 2-3).
Step 6 Insert two green-headed screws through
the holes in the slide assembly behind the
handle and into the metric tapped holes
in the side of the instrument.
Step 7 Insert two green-headed screws through
the holes near the rear of the slide assem
-
bly and into the metric tapped holes in
the side of the instrument.
Step 8 Insert the two SAE threaded screws (re
-
moved from the feet) through the 90° tabs
on the rear of the slide assembly and into
the rear panel of the instrument.
Step 9 Using the Phillips screwdriver, tighten all
screws holding the left side slide assem-
bly to the instrument chassis.
681XXC OM 2-11
RACK MOUNTING KIT
INSTALLATION INSTALLATION
NOTE
The screws with green heads have
metric threads. When it becomes
necessary to replace any of these
screws, always use the exact re
-
placement green-headed screws
(Anritsu P/N 2000-560) to avoid
damage to the instrument.
Figure 2-3. Rack Mounting Hardware Installation
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