HP 8660C User manual

Printed JANUARY 1981
©Hewlett-Packard Co. 1975,1977,1979, 1981

General Information
Model 8660C
Figure 1-1. Model 8660C and Accessories Supplied
1-0

Model 8660C
General Information
SECTiOM I
GEiMERAL INFORMATION
1-1. INTRODUCTION
1-2. This manual contains all information required
to install, operate, test, adjust and service the
Hewlett-Packard Model 8660C Synthesized Signal
Generator mainframe. This section covers instru¬
ment identification, specifications and other basic
information. Figure 1-1 shows a front view of the
instrument and accessories supplied.
1-3. The other various sections of this manual
provide information as follows:
a. SECTION II, INSTALLATION, provides
information relative to incoming inspection, power
requirements, mounting, packing for shipment, etc.
b. SECTION in, OPERATION, provides
information relative to operating the instrument.
c. SECTION IV, PERFORMANCE TESTS,
provides information required to ascertain that the
instrument is performing in accordance with pub¬
lished specifications.
d. SECTION V, ADJUSTMENTS, provides
information required to properly adjust and align
the instrument after repairs are made.
e. SECTION VI, REPLACEABLE PARTS,
provides ordering information for all replaceable
parts and assemblies.
f. SECTION VII, MANUAL CHANGES,
provides manual change information necessary to
document all prefixes listed on the title page. In add¬
ition, this section also contains recommended modi¬
fications for the earlier instrument configurations.
g. SECTION VIII, SERVICE, includes all
information required to service the instrument
when a malfunction occurs.
1-4. Packaged with this instrument is an Operating
Information Supplement. This is simply a copy of
the first three sections of this manual (less Table
1-2). This supplement should stay with the instru¬
ment for use by the operator. Additional copies of
the Operating Information Supplement may be
ordered separately through your nearest Hewlett-
Packard office. The part number is listed on the
inside title page of this manual below the Manual
Part Number.
1-5. Also listed on the inside title page of this
manual, below the manual part number, is a
“Microfiche” part number. This number may be
used to order 4x6 inch microfilm transparancies
of the manual. Each microfiche contains up to 60
photo-duplicates of the manual pages. The micro¬
fiche package also includes the latest Manual
Changes Supplement as well as all pertinent Service
Notes.
1-6. SPECiFiCATlONS
1-7. Instrument specifications are listed in Table
1-1. These specifications are the performance
standards or limits against which the instrument
may be tested.
1-8. INSTRUMENTS COVERED BY MANUAL
1-9. This instrument has a two-part serial number.
The first four digits and the letter comprise the
serial number prefix. The last five digits form the
sequential suffix that is unique to each instrument.
The contents of this manual apply directly to
instruments having the same serial number pre-
fix(es) as listed under SERIAL NUMBERS on the
inside title page.
1-10, An instrument manufactured after the print¬
ing of this manual may have a serial prefix that is
not listed on the inside title page. This unlisted
serial prefix indicates that the instrument is dif¬
ferent from those documented in this manual. The
manual for this instrument is supplied with a
yellow Manual Changes supplement that contains
“change information” that documents the
differences.
1-11. In addition to change information, the sup¬
plement may contain information for correcting
errors in the manual. To keep this manual as
current and accurate as possible, Hewlett-Packard
recommends that you periodically request the
latest Manual Changes supplement for this manual.
The supplement for this manual is keyed to this
manual’s print date and part number, both of
1-1

General Information
Model 8660C
Table 1-1. Model 8660C Specifications (1 of 2}
SPECIFICATIONS
Frequency Selection:
Keyboard control panel allows selection of CW (or
center frequency) by entry keys or synthesized
tuning dial. Least significant digit either 1 Hz
(standard) or 100 Hz (Option 004).*
Reference Oscillator:
Internal: 10 MHz quartz oscillator. Aging rate less
than ±3 parts in 10® per 24 hours after 72 hour
warmup (±3 parts in 10® per 24 hours after 30
day warmup, Option 001).
External: Rear panel switch allows operation from
any 5 MHz or 10 MHz signal at a level between
0.5V and 2.5V rms into 170 ohms. Stability
and spectral purity will be partially determined
by characteristics of external reference oscillator.
Reference Output:
Rear panel BNC connector provides output of sig¬
nal selected (INT. or EXT.) at the following levels
into 170 ohms:
Internal Reference: 0.75V to 1.5 Vrms.
External Reference: Nominally equal to external
input.
Display:
Ten-digit numerical LED display of CW frequency
is active in either local or remote mode. Spring-
loaded pushbuttons provide display of sweep width,
selected step size, or characters being entered on
the keyboard.
Synthesized Search:
Synthesized search dial changes the synthesized out¬
put frequency 180 steps per revolution (with the
86601A, the COARSE and STEP tuning are desensi¬
tized to 36 steps/revolution). Step sizes are 1 Hz,
1 kHz, 1 MHz, or any step size entered through the
keyboard.
Digital Sweep:
Type: Symmetrical about CW/center frequency.
Sweep width is divided into 100 synthesized
steps for fastest sweep speed or 100 steps for
slower speeds or Manual Sweep.
Sweep Width: Continuously adjustable over range
of RF section installed. Smallest step size is
equal to frequency resolution of mainframe.
Sweep End Point Accuracy: Same as reference oscil¬
lator accuracy.
Sweep Speed: Selectable 0.1 sec, 1 sec, or 50 sec
per sweep (Auto or Single).
Sweep Output: 0 to +8V stepped ramp, 100 or
1000 equal steps depending on sweep speed.
Manual Sweep: Synthesized search dial allows
manual sweep over width selected in 1000 steps
(LED display follows output frequency during
manual sweep).
Single Sweep: Initiated by momentary contact
pushbutton.
Frequency Stepping:
After a step size has been entered on the keyboard,
depressing STEP t or STEP 4 button will increment
frequency up or down by the desired step size.
Step Accuracy: Same as reference oscillator accuracy.
REMOTE PROGRAMMING
CW frequency, frequency stepping (STEP t or STEP 4)
and output level, and most modulation functions are
programmable. Note: digital sweep is NOT
programmable.
Frequency:
CW frequency is programmable over entire range
with same resolution obtained in manual operation.
Frequency Step:
STEP t or STEP 4- may also be programmed to change
output frequency by a previously selected step size.
Output Level:
Programmable in 1 dB steps over the output range of
the RF section installed (for output level accuracy
see RF section specifications).
Modulation: See specifications for modulation and RF
section installed.
Programming Input:
Connector Type: 36 pin Cinch type (mating connec¬
tor supplied). (Optional HP-IB interface; 24 pin
Cinch type 57 (mating connector NOT supplied)).
Logic: TTL compatible (negative true)
“0” logic state corresponds to +2V or higher.
“1” logic state corresponds to +0.8V or lower.
Internal Fan-in from Programming Connector:
10; (required current approximately 15 mA per line
in the “1” state).
*When using 86603A RF section above 1300 MHz least significant digit becomes either 2 Hz (standard) or 200 Hz
(Option 004).
1-2

Model 8660C
General Information
Table 1-1. Model 8660C Specifications (2 of 2)
GENERAL
Operating Temperature Range: 0° to +55°C.
Leakage: Meets radiated and conducted limits of
MIL I-6181D.
Power; 100 or 120 Vac, +5 —10% at 48 to 440 Hz.
200 or 240 Vac, +5 -10% at 48 to 66 Hz.
400 VA maximum.
Weight: (Mainframe only); Net, 23.2 kg (51 !b),
Shipping 28.6 kg (63 lb).
Options:
Option 001: ±3 x 10'^ /day internal reference
oscillator.
Option 002: No internal reference oscillator.
Option 003: Operation from 50 to 400 Hz line.
Option 004: 100 Hz frequency resolution (200 Hz
above 1300 MHz center frequency.)
Option 005: HP-IB programming interface.
Option 100: 11661B factory installed.
Option 908: Rack Mounting Kit.
which appear on the inside title page. Compli¬
mentary copies of the supplement are available
from Hewlett-Packard.
1-12. For information concerning a serial number
prefix not listed on the inside title page or in the
Manual Changes supplement, contact your nearest
Hewlett-Packard office.
1-13. DESCRIPTION
1-14. The Model 8660C Synthesized Signal Gener¬
ator Mainframe requires two plug-in sections to
provide a useable RF output. The plug-ins required
are an RF Section and a Modulation (or Auxiliary)
Section. These plug-in sections are inserted into the
front of the Model 8660C; all operating controls
are on the front panels of the plug-in sections or on
the mainframe panel.
1-15. An internal plug-in unit, the Frequency
Extension Module (HP accessory number 11661) is
required when any RF Section other than the HP
Model 86601 is in use,
1-16. GENERAL OPERATING PRINCIPLES
1-17. All of the signals generated in the Model
8660C are phase locked, directly or indirectly, to a
100 MHz master oscillator in the reference section.
The 100 MHz master oscillator is phase locked to
an internal temperature controlled oscillator or to
an external standard. Provisions are made for the
internal oscillator to be used as a reference signal
for other equipment.
1-18. The Model 8660C uses synthesizer tech¬
niques to provide digitally controlled, precise RF
signals which are used in the RF Section output
plug-ins to produce the selected output frequency.
The output frequencies are exactly those selected
in 1 Hz or 2 Hz increments in the standard
instruments, or in 100 Hz or 200 Hz increments in
Option 004 instruments.
1-19. Six phase locked loops, (four in Option 004
instruments), all phase locked to the 100 MHz
master oscillator, are used to generate the RF
signals used in the RF Section plug-ins to produce
the final output signal.
1-20. The Model 8660C output frequency may be
selected by front panel controls or by a remote
programming device.
1-21. Operating of the plug-in sections may also be
remotely programmed through the mainframe
circuits.
1-22. Descriptions, operating instructions and ser¬
vice information for the various plug-in sections is
provided in separate manuals.
NOTE
The 8660 family, and plug-ins available
are described briefly on the first foldout
Sheet.
1-23. OPTIONS
1-24. Option 001: Reference Oscillator with ± 3
X 10'® / per day stability.
1-25. Option 002: No internal standard reference
oscillator.
1-26. Option 003: 50 to 400 Hz ac operation.
1-27. Option 004: 100 Hz resolution below
1300 MHz, 200 Hz resolution above 1300 MHz.
1-3

General Information
Model 8660C
1-28. Option 005. Hewlett-Packard Interface Bus
installed instead of BCD interface. HP-IB utilizes
some ASCII interface codes (also previously refer¬
red to as General Purpose Interface Bus).
1-29. Option 100. Adds an internal plug-in, the
11661 (for use with an 86602 or 86603 RF Sec¬
tion) before the instrument is shipped from the
factory.
1-30. Option 908. Adds a rack mounting kit. If the
8660C was purchased without the rack mounting
option, the kit may be ordered from the nearest
Hewlett-Packard office using HP part number
08660-60347.
1-31. EQUIPMENT REQUIRED BUT NOT
SUPPLIED
a. A detachable three-wire power cable. The
type of power cord will be determined by the ship¬
ment destination.
b. An accessory kit, part number 08660-
60070, consisting of the following:
1 Connector, Type N-to-BNC
1 Extender Board, 20 contact
1 Extender Board, 24 contact
2 Extender Boards, 15 contact
1 Extender Board, 18 contact
1 Connector 36 pin with hood
and clamp
1 Extender Board A3 Interface,
18 Contact
1 Extender Board A3 Interface,
12 Contact
1 Interface Extender Board Cable
1250-
5060-
5060-
5060-
6060-
0780
0256
0258
0276
0277
1251-0084
08660-60348
08660-60349
08660-60361
1-32. An RF Section and a Modulation or Auxil¬
iary Section must be installed in the Model 8660C
mainframe. In addition when an RF Section such
as the 86602 or 86603 is used, the internal Fre¬
quency Extension Module (Model 11661) must be
used.
1-33. EQUIPMENT AVAILABLE
1-34. A service kit, Hewlett-Packard accessory
number 11672A, is recommended for servicing and
adjusting the mainframe and the plug-in sections.
Contents of the service kit are listed in Table 1-2.
Individual items in the kit may be ordered separ¬
ately if desired.
1-35. ACCESSORIES SUPPLIED
1-36. The following accessories are provided with
the Model 8660C:
1-37. WARRANTY
1-38. Certification and warranty information for
the Model 8660C appears on the inside front cover
of this manual.
1-39. TEST EQUIPMENT AND ACCESSORIES
1-40. Table 1-2 lists the test equipment and acces¬
sories recommended to test, adjust, and service the
Model 8660C.
1-41. ELECTRICAL PROTECTION
1-42. The safety classification of this instrument is
Safety Class I.
1-43. This apparatus has been designed and tested
to operate in a safe manner. The Operating and
Service Manual contains information, warnings and
cautions which must be followed by the user to
ensure safe operation and to retain safe operating
conditions.

Model 8660C
Installation
2-1. INTRODUCTION
2-2. This section provides information on in¬
coming inspection, selecting the input line voltage,
operating environment, and information applicable
to bench and rack mounted operation of the Model
8660C.
2-3. INITIAL INSPECTION
2-4. Inspect the shipping container for damage. If
the shipping container or cushioning material is
damaged it should be kept until the contents of the
shipment have been checked mechanically and
electrically. The contents of the shipment are
shown in Figure 1-1, and the procedures for
checking electrical performance are given in
Section IV. If the contents are incomplete, if there
is mechanical dam^e or defects, or if the instru¬
ment does not pass the electrical performance test,
notify the nearest Hewlett-Packard office. If the
shipping container is damaged or the cushioning
material shows signs of stress, notify the carrier as
well as the Hewlett-Packard office. Keep the
shipping materials for the carrier’s inspection. The
HP office will arrange for repair or replacement
without waiting for claim settlements.
2-5. The warranty statement for the instrument is
on the inside front cover of this manual. Contact
the nearest Sales/Service Office for information
relative to warranty claims.
2-6. PREPARATION FOR USE
2-7. Power Requirements.
2-8. The Model 8660C requires a power source of
100, 120, 220, or 240 volts +5%, -10%, 48-66 Hz.
Power consumption is approximately 400 VA
maximum.
2-9. Line Voltage Selection
CAUTION
To prevent damage to the instrument
make the line voltage selection BEFORE
connecting the line power. Also ensure
the line power cord is connected to a
line power circuit that is provided with a
protective earth contact.
2-10. A rear panel line power module, (A7),
permits operation from 100,120, 220, or 240 Vac.
The number visible in the window (located on the
module) indicates the nominal line voltage to
which the instrument must be connected.
2-11. To prepare the instrument for operation,
slide the fuse compartment cover to the left (the
line power cable must be disconnected). Pull the
handle marked FUSE PULL and remove the fuse;
rotate the handle to the left. Gently pull the
printed circuit voltage selector card from its slot
and orient it so that the desired operating voltage
appears on the top-left side (see Figure 2-1).
Firmly push the voltage selector card back into its
slot. Rotate the FUSE PULL handle to the right,
install a fuse of the correct rating, and slide the
fuse compartment cover to the right.
NOTE
For 110-~120V line, use 4A slo-blo fuse, HP
Stock No. 2110-0635. For 220-240V line,
use 2A slo-blo fuse, HP Stock No. 2110-0303.
To avoid the possibility of injury or death,
the following precautions must be followed
before the Instrument is switched on:
a. Note that the protection provided by
grounding the instrument cabinet may be lost
If any power cable other than the three¬
pronged type supplied is used to couple the
ac line voltage to the instrument.
b. If this Instrument is to be energized via an
autotransformer to reduce or increase the line
voltage, make sure that the common terminal
is connected to the earthed pole of the power
source.
c. The power cable plug shall only be inserted
into a socket outlet provided with a protec¬
tive earth contact. The protective action must
not be negated by the use of an extension cord
without a protective conductor (grounding).
d. Before switching on the instrument, the
protective earth terminal of the instrument
must be connected to a protective conductor
of the power cord. This is accomplished by
ensuring that the instrument's internal earth
terminal is correctly connected to the instru¬
ment's chassis and that the power cord is
wired correctly.
2-1

Installation
Model 8660C
To avoid the possibility of hazardous electrical shock, do not oper¬
ate this instrument at line voltages greater than 126.5 Vac with line
frequencies greater than 66 Hz (leakage currents at these line settings
may exceed 3.5 mA).
Figure 2-1. Line Voltage Selection
NOTE
The correct fuse rating for the line
voltage selected is listed on the line
power module. More information about
fuses is given in the table of replaceable
parts in Section VI (reference designa¬
tion is A7F1).
2-12. Power Cable
2-13. In accordance with international safety
standards, this instrument is equipped with a
three-wire power cable. When connected to an
appropriate power line outlet, this cable grounds
the instrument cabinet. The type of power cable
plug shipped with each instrument depends on the
country of destination. Refer to Figure 2-2 for the
part numbers of the power cable plugs available.
2-14. Mating Connectors
2-15. Internal mating connectors between the
Model 8660C and the plug-in sections are in fixed
positions. Refer to Figure 8-132 for plug-in con¬
nector information. Refer to Figure 8-109 for
information relative to the remote control
connector, J3.
2-16. Operating Environment
2-17. The operating environment should be within
the following limitations:
Temperature.0 C to +55° C
Humidity.<95% relative
Altitude.<4600 metres (15 000 feet)
2-18. A forced air cooling system is used to
maintain the operating temperature required by
the instrument. The air exhaust fan is located on
the rear panel of the instrument; the air intake is
through the side panels of the instrument. When
operating the instrument, choose a location that
provides at least three inches of clearance at the
rear and at least an inch of clearance for each side.
The clearances provided by the plastic feet in
bench stacking and the filler strip in rack mount¬
ing are adequate for the top and bottom cabinet
surfaces.
2-2

Model 8660C
Installation
220/240V
OPERATION
PLUG*: SEV 1011.1959-24507
TYPE 12
CABLE*: HP 8120-2104
220/240V
100/120V
^ OPERATION
OPERATION
PLUG*: NZSS 198/AS C112
PLUG*: NEMA 5-15P
CABLE*: HP8120-1369
CABLE*: 8120-1378
220/240V
OPERATION
PLUG*: NEMA 6-15P
CABLE*: HP 8120-0698
220/240V
PLUG*: CEE7-Vtl
CABLE*; HP8120-1689
220/240V
*The number shown for the plug is the industry identifier for the plug only.
The number shown for the cable is an HP part number for a complete cable including the plug.
Figure 2-2. Power Cable HP Part Numbers
2-19. Bench Operation
2-20. The instrument has plastic feet and a fold-
away tilt stand for convenience in bench operation.
The tilt stand raises the front of the instrument for
easier viewing of the control panel and the plastic
feet are shaped to make full width modular
instruments seif aligning when stacked.
2-21. Rack Mounting {Option 908)
2-22. The 8660C Option 908 is supplied with a
rack mounting kit. This kit contains all the neces¬
sary hardware and installation instructions for
mounting the instrument in a rack with 19-inch
spacing (see Figure 2-3). The HP part number for
this kit is 08660-60347.
2-23. STORAGE AMD SHIPMENT
2-24. Environment
2-25. The instrument should be stored in a clean,
dry environment. The following environmental
limitations apply to both storage and shipment:
Temperature .—40°Cto+75"C
Humidity .<95% relative
Altitude . . . . <7600 metres (25 000 feet)
2-26. Packaging
2-27. Tagging for Service. If the instrument is being'
returned to Hewlett-Packard for service, please
Figure 2-3. Preparation for Rack Mounting
complete one of the blue repair tags located at the
end of this manual and attach it to the instrument.
2-28. Original Packaging. Containers and materials
identical to those used in factory packaging are
available through Hewlett-Packard offices. If the
instrument is being returned to Hewlett-Packard
for servicing, attach a tag indicating the type of
.service required, return address, model number,
and full serial number. Also, mark the container
FRAGILE to assure careful handling. In any
correspondence, refer to the instrument by model
number and full serial number.
2-3

Installation
Model 8660C
2-29. Other Packaging. The following general in¬
structions should be used for re-packaging with
commercially available materials:
a. Wrap the instrument in heavy paper or
plastic. (If shipping to a Hewlett-Packard office or
service center, attach a tag indicating the type of
service required, return address, model number,
and full serial number.)
b. Use a strong shipping container. A double¬
wall carton made of 2.4 MPa (350 psi) test material
is adequate.
c. U se enough shock-absorbing material (75—
100 mm; 3 to 4-inch layer) around all sides of the
instrument to provide firm cushion and prevent
movement inside the container. Protect the control
panel with cardboard.
d. S eal the shipping container securely.
e. M ark the shipping container FRAGILE
to assure careful handling.
2-4