HP 608E Service manual

•
•
.
.
60BE/F
VHF SIGNAl GENERATOR
HP PART NUMBER 00608-90046
rli~ HEWLETT
~~ PACKARD
l

,
,-------- OPERATING AND SERVICE MANUAL ----------,
608E/F
VHF SIGNAl GENERATOR
HP PART NUMBER 00608-90046
SERIALS PREFIXED:
This Operating and Service manual applies to HP
608E/F instruments with serial numbers prefixed
833-
above 02720 (GOBE) and 832- above 01500
(608F).
SERIAL PREFIXES NOT LIST~!l:
For instruments with lower serial number prefixes
a
"Backdating" Appendix is supplied in the back
of this manual.
Flio- HEWLETT
~r..I PACKARD
© Copyright HEWLETT-PACKARD COMPANY 1965
1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA, U.S.A.
\OPERATING AND SERVICE MANUAL PART
NO. 00608·90046
Operating end Service Menual MIcrofiche Part No. 00608-90047 Printed: APRIL
1981

Model 608E/F '
Table of Contents
TABLE OF CONTENTS
Section
Page Section
Page
IV PRINCIPLES OF OPERATION ..•....
VMAINTENANCE .
5-1. Introduction .........•.•..
5-3. Periodic Inspection ...•.•....
5-4. Cleaning •.......•.•....
5-6. Lubrication ......•...•...
5-9. Performance Tests ...••.•...
II INST ALLA TION .......•......•••
2-1. Incoming Inspection .......••.
2-3. Preparation For Use .......•
2-4. Power Requirements •.......
2-6. Power Cable .
2-8. Repacking For Shipment •.......
I GENERAL INFORMATION ...•.•..•.
1-1. Description ......•••.•....
1-3. Frequency ........•......
1-5. Modulation .
1-7. RFI ....•••............
1-9. Auxiliary Equipment .•.•....•.
1-10. Model 11509A Fuseholder ....
1-12. Model 11508A Terminated
Output Cable •............
1-14. Instrument Identification .....•.
5-15
5-15
5-29
5-30
5-32
5-32
5-14
5-26
5-26
5-16
5-12
5-12
5-13
5-13
5-18
5-11
5-17
5-17
5-18
5-12
5-10
5-10
5-23
5-23
5-23
5-25
5-25
5-16
5-1
5-8
5-9
5-9
5-8
5-8
5-8
5-1
5-5
5-5
5-5
5-7
5-7
Purpose .
Frequency Accuracy and
Resettability Test ....•....
Calibrator Accuracy Test .
Frequency Drift Test .
Residual FM Test .
Incidental FM Test •...•....
Maximum RF Output Test .....
Frequency Response and
Leveling Test .
RF Output Accuracy Test .
Uncalibrated RF Output Test .
External Sine-Wave Modulation
and Modulation Meter Test ..
Internal Modulation Test .
Envelope Distortion Test .
External Pulse Modulation and
ReSidual Level Test •.....•.
RF Leakage Test .
Frequency Control Input Test
(Model 608F Only) ........•
Frequency Analog Output Test
(Model 608F Only) .
Synchronization Test with Model
8708A
Synchronizer
(Model 608F) ...•.....••.
Adjustment .
Power Supply Voltage Adjustments
Modulation Meter Adjustment ...
Calibration of Percent
Modulation Meter .......•
Automatic Output Leveling
Adjustment .......•......
RF Oscillator Adjustment .....
Uncalibrated RF Output, Minimum
RF Output, and RF Amplifier
Tracking Adjustment ....•.
RF Output Meter Accuracy
Adjustment .....••......
RF Output Meter/ AUenuator
Frequency Response and Auto-
matic-Leveling Output
Adjustment .
Crystal Calibrator Adjustment .•
Troubleshooting ...••........
Isolating a Trouble to a
Circuit Section ..........•
Isolating Trouble in Transistor
Circuits .
Replacement and Repair ......•
Etched Circuit Board Repair .
Component Replacement .
Etched Conductor Repair •....
Transistor and Semiconductor
Diode Replacement ...•.....
Replacement of Electron
Tubes .
Attenuator Probe Repair
and Replacement .......•..
Replacement in Housing .
Replacement of Lamp DSI .
Location of Parts .
5-47.
5-48.
5-50.
5-59.
5-62.
5-63.
5-64.
5-66.
5-46.
5-67.
5-54.
5-74.
5-82.
5-83.
5-85.
5-42.
5-43.
5-25.
5-26.
5-29.
5-31.
5-34.
5-37.
5-10.
5-12.
5-13.
5-14.
5-15.
5-16.
5-17.
5-18.
5-19.
5-20.
5-21.
5-41.
5-27.
5-28.
5-22.
5-23.
5-24.
4-4
4-5
4-7
4-7
4-7
4-8
5-1
5-1
5-1
5-1
5-1
5-1
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-4
3-4
3-5
3 -5
4-1
4-3
2-1
2-1
2-1
2-1
2-1
2-1
4-1
4-1
4-1
4-1
4-1
4-2
4-3
4-3
4-3
4-3
1-1
1-1
1-1
1-1
1-1
1-1
1-1
1-1
1-1
Introduction .
General Description. .. . .
RF Generator Section,
Mode1608E .
RF Generator Section,
Model 608F .
Amplitude Modulation Section ..
Attenuator Section .••..•..••
Calibrator Section ..•.....•.
Modulation Meter Section ...•.
Power Supply Section .
Detailed Description .
RF Generator Section,
Model608E ....•......••
RF Generator Section,
Model608F ....••.......
Amplitude Modulation Section ••
Attenuator Section .......•
Calibration Section .
Modulation Meter Section .
Power Supply Section .
4-33.
4-9.
4-15.
4-17.
4-19.
4-21.
4-23.
4-25.
4-37.
4-51.
4-55.
4-59.
4-63.
4-1.
4-3.
4-5.
4-7.
III OPERATION .••..............•.
3 -1. Introduction .
3-3. Controls, Indicators and Connectors
3-5. Pre-Operational Procedures ....
3-7. RF Output Loading .....•...
3 -9. Turn-On Procedures .....•..
3-11. Calibration Procedures .
3-16. Mode Operating Procedures ...•.
3-18. Internal Modulation. . . . .
3
-20. External Modulation ..... ..
3-22. Phase-Lock Operation Procedures
(Model 608F Only) ...
•
•
iii

Table of Contents
List of lllustrations
TABLE OF CONTENTS (Cont.)
Model 608E/F
Section Page Section
Page
VI REPLACEABLE PARTS .....•.... 6-1
6-1. Introduction............... 6-1
6.3. Replaceable Parts List. • . • • •• 6-1
6-6. Ordering Information. ••••• •• 6-1
6-9. Factory Selected Parts (*). . . .. 6-1
vn SCHEMATIC DIAGRAMS
COMPONENT LQCATION INFORMATION 7-1
7-1. Introduction............... 7-1
APPENDIX 1. .................... .. 1·1
APPENDIX IT. . • . . • • • . • • . • • • • • • . • . •. IT-I
LIST OF ILLUSTRATIONS
Number
Number
1-1.
3-3.
3-4.
4-1.
5-1.
5-2,
5-3.
5-4.
5-5.
5-6.
5-7.
5-8.
5·9.
5-10.
5-11.
5-12.
5-13.
5-14.
5-15.
5-16.
5-17.
Iv
Title
Model 608E and 608F'VHF Signal
Generators •................
Front Panel Controls, Indicators,
and Cormectors ••..•..........
Controls, Indicators and Connectors
Used in Operation with Internally
Generated Signals ......•..•.•.
Controls, Indicators and Connectors
Used In Operation with Externally
Supplied Signals ..........•...
Controls. Indicators, .:::.!:.1 ~::'''::''::::''=3
Used in Phase-Lock Operation
(Model 608F Only) ...•.........
Overall Block Diagram, Models
608E and 608F .
Fabricated Test EqUipment ...
Lubrication POints, RF 1\mer Drive
Mechanism. ...•.............
Frequency Accuracy and Resettability
Test Setup ...•..............
Residual and inCidental FM Test Setup.
RF OutpJ.t Test Setup. ....•.....•
Uncalibrated RF Output Test Setup ..
External Sine-Wave Modulation and
Modulation Meter Test Setup .
Envelope Distortion Test Setup .
Pulse Modulation Test Setup .
RF Leakage Test Setup .
Frequency Control Input TestSetup ..
Synchronization Test Setup .
Location Power Supply and
Modulation Meter Adjustments ....
Modulation Meter Calibration Test
Setup ............•.........
Pattern on 140 Oscilloscope at 50%
modulation .
Location of Leveling and RF Output
Meter Adjustment .
Location of RF Oscillator Adjustment
Page
1-0
3-2
3-6
3-8
3-10
4-0
5-3
5-4
5-5
5-6
5-7
5-8
5-"
5-10
5-10
5-11
5-11
5-12
5-13
5-14
5-14
5-15
5-16
5-18.
5-19.
5·20.
5-21.
5_22.
5·23.
5-24.
5-25.
5-26.
5_27.
5-28.
5_29.
5-30.
5_31.
5-32.
5·33.
7 -1.
7-2.
7-3.
7-4.
7 -5.
TtUe
Frequency-Response Adjustments ...
Location of Frequency-Response and
Crystal-Calibrator Adjustments ....
Voltage and Resistance Measure
INT 1000 - Operation ...•.......
ALC Board Voltage and Resistance
Measurements, CW and PULSE
SET RF OUTPUT Operation .
Transistor Biasing and Operating
Characteristics ...•...........
Location of Electron Tubes .
Replacement of Oscillator and
Amplifier Tubes .
Disassembly of Attenuator Drive
Cable. , .
Attenuator Probe, ShOWing Pickup
Loop and Impedance Matching Network
RF Generator Assembly Location of
Unlabeled Parts (Side Cover Removed)
Model 608E RF Generator Assembly
ShoWing Location of Unlabeled Parts
(Top Cover Removed) .......•..•
Model 608F RF Generator Assembly
ShOWing Location of Unlabeled Parts
(Top Cover Removed). .
Right Side View Showing Location of
Unlabeled Chassis Components .....
Left Side View Showing Location of
Unlabeled Components .
Rear View Showing Location of
Unlabeled Chassis Components .
Circuit Board Parts Identification .
Schematic Wormation lllustration _
Schematic Diagram Notes .
Component Identification, Modulator
and ALC Board .
RF Generator and Modulator
Schematic Diagram .
Modulation Meter, Crystal Calibration,
and Power Supply Schematic Diagram ..
Page
5-18
5-18
5-19
5-22
5-24
5-28
5_29
5-30
5-31
5-32
5-33
5-34
5-35
5-36
5-37
5-38
7-1
7-2
7-3
7-3
7 -5
)
,
)

•
•
Model 608E IF
Number
I-I.
5-1.
5-2.
5-3.
5-4.
5-5.
5-6.
5-7.
6-1.
6-2.
6-3.
6-4 .
LIST OF TABLES
Title
Specifications ...............•...
Test Equipment Required for
Maintenance .
Lubrication Chart .
Out-of-Circuit
Transistor Resistance
Measurement .
Safe Ohmmeter Ranges for
Transistor
Resistance Measurement .
Etched
Circuit Soldering Equipment .
Checks Following Tube and Semiconductor
Replacement .
608E/F Troubleshooting Procedure .
Reference Designations .
Abbreviations .
Replaceable
Parts .
Code
List of Manufacturers .
Page
1-2
5-2
5-4
5-25
5-25
5-26
5-27
5-40
6-2
6-2
6-4
6-12
List of Tables
v

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-c:JP
Section I
••
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••
--
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Model 608EIF
•
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--
--
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Model 608E
e
.1iJ1iia .
V
Model 608F
)
\
./
1-0
Figure 1-1. Model 60SE and 608F VHF Signal Generators

Model 608E/F
SECTION I
GENERAL INFORMATION
Sedion I
•
,
1·1. DESCRIPTION.
1-2. The Hewlett-Packard Model 608E and 608F
Signal Generators (see Figure 1-1) are designed to
meet the requirements of precision laboratory work,
and
yet to be equally useful for general applications in
the VHF frequency range. The Model 608E furnishes
RF signals from O. 1 microvolt to 1volt from 10 MHz
to 480 MHz, whiletheModel608F supplies RF signals
from O. 1 microvolt to O. 5 volt in a frequency range
from 10 MHz to 455 MHz. The RF carrier can be
amplitude modulated by internally generated sine-
wave signals, or by externally supplied sine-wave or
pulse signals. The Mooel 608F contains frequency
control circuitry which permits the instrument to be
used in phase-lock operation with the Model 8708A
Synchronizer. This provision provides a stabilized
output across most of the range of the instrument,
with a drift factor of <2 x 10-1 per 10 minutes. The
instruments can be used for troubleshooting, testing,
calibrating, measuring standing-wave ratios, and
checking antenna and
transmission line characteris-
tics. To preserve accuracy, equipment design holds
spurious modulationto alow value under all operating
conditions. Detailed specifications for both instru-
ments are listed in Table 1-1.
1-3.
FREQUENCY.
1-4. The frequency ofthec'.1tpu! signal is indicated on
adirect reading dial, the calibration of which is accurate
to better than ±O.5% for the 608E and ±l% for the 608F,
when the cursor and FINE FREQ are properly aligned.
Calibration accuracy may be improved further by use of
abuilt-incrystal-controlled heterodyne calibrator which
furnishes 1 MHz checkpoints from 10 MHz to 270 MHz, or
5MHz checkpoints over the entire frequency range of the
instrument. At any checkpoint the calibration can be set
very elO8e to the calibrator accuracy of 0.01 %, bringing
overall accuracy to at least ±O.O5%. F'l'equency check
point signal.e are obtained when a headphone set (not
fumi.ehed) is plugged into the XTAL CAL OUTPUTjack.
The control for the output attenuator is calibrated in both
decibels
and volts. When the instrument is connected to a
5Q.ohm resistive
load and power into the output attenua·
tor is exactly at the ATI'ENUATOR CALIBRATED mark
(+7 dB) on the RF OUTPUT meter, the level of power or
voltage applied to the RF OUTPUT connector may beread
directly on the A1TENUATOR dial with an accuracy of
±1 dB. When connected to a5O-ohm resistive load, the
VSWR at the RF OUTPUT connector will nol be greater
than 1.2 (SWR of 1.6 dB). The signal generators feature
automatic output leveling, maintaining the RF output
within ±1 dB of the adjusted output.
1-5. MODULATION.
1-6. The RFoutput signal can be amplitude modulated
by
internally generated 400 or lOOO-cyde sine waves,
externally applied sine waves above 1. 0volt rms over
the frequency range from 20 Hz lo 20 kHz, or exter-
nally applied pulses of 10 volts peak-lo-peak. When
pulse modulated, the signal generators are capable of
producing pulses of RF energy as short as 4 micro-
seconds at Signal frequencies above 40 MHz, and pulses
as short as 2 microsecond above 220 MHz. The degree
of sine-wave modulation is continuously variable from
o to 90% by a front-panel control. All sine-wave modu-
lation of the output signal is continuously monitored
and indicated in percentage on a direct reading modu-
lation meter.
1-7. RFI.
1-8. RF leakage is held to a minimum and is such
that when the output signal is adjusted for O. 1 micro-
volt, the conducted signal leakage at any other front
panel connector and the radiated leakage two inches
from the instrument are each less than 1.0 microvolt.
1·9. AUXILIARY EQUIPMENT.
1-10. MODEL 11509A FUSEHOLDER.
1-11.
To protect the output attenuator from damage,
for some applications (such as transceiver testing) it
is desirable to insert afuse between the signal gen-
erators and external equipment. The 11509A is a
special coaxial fuseholder which houses atype 8AG,
1/16 amp fuse which protects the output attenuator
from damage in the event that an external voltage is
accidently applied to the RF OUTPUT connector. The
fuseholder has an insertion loss of O. 50 dB at 200 MHz,
O. 56 dB at 300 MHz, and 0.65 dB at 400 MHz; tis
SWR is not greater than 1. 35 when connected to a50-
ohm resistive load.
1-12. MODEL 1150BA TERMINATED OUTPUT
CABLE.
1-13. This cable assembly provides aSO-ohm ter-
mination and standard binding posts at the end of a 24-
inch length of cable. The 11508A allows direct con-
nectionofthe instruments to a high-impedance circuit.
1·14. INSTRUMENT IDENTIFICATION.
1-15. Hewlett-Packard 1nstruments carry a two-sec-
tion, eight-digit serial number. The first three digits
are a prefix. The contents of this manual apply to
those instruments having the serial number prefix
shown on the title page. If the serial prefix on your
instrument 1s not mentioned on the title page, in the
Appendix to this manual, or in aManual Change Sheet
enclosed with the manual, the corred information may
be
obtained from any Hewlett- Packard Sales and Ser-
vice Office (see rear of manual for addresses).
1-1

Section I
Model 608E/F
Table 1-1. Specifications
FREQUENCY CHARACTERISTICS
608E
Accuracy: Within ±1 dB of attenuator dial reading
at any frequency when RF output meter indicates
"ATTENUATOR CALIBRATED."
input. A voltage change from -2 volts to -32 volts
will change the output frequency more than 0.2%
at the low end of each band and more than 1% at
the high end of each band. Nominal 4 Kn input
impedance, direct coupled. Voltage limits:
OV .::: applied voltage .::: -50V.
OUTPUT CHARACTERISTICS
608E 608F
Output Level: Continu-
ously adjustable from
0.1 trV to O. 5V into a
50n load. Output at-
tenuator calibrated in
V and dBm (0 dBm =
1mW in 50n).
Output Level; Continu-
ously adjustable from
0.1 /lV to IV into a
50n load. Output at-
tenuator calibrated in
V and dBm (0 dBm =
1mW in SOn).
608F
Range: 10 to 455 MHz in
five bands (10-21, 21-
44,44-95,95-210, and
210-455 MHz). 10-
430 MHz when used
with 8708A Synchro-
nizer.
Accuracy: ±1% with cur-
sor adjustment.
Drift: Less than 50 parts
in 106 per 10 min. pe-
riodafter Ihr. warm-
up. Stability used with
8708A Synchronizer.
5x 10-
a
/min.
2x 10-
7
/min.
Range: 10to 480 MHz in
five bands (10-21, 21-
43,43-95, 95-215, and
215-480 MHz).
Accuracy: ±O.5% with cur-
sor adjustment.
Drift: Less than 50 parts
in 10
6
per 10 min.
period after 1 hr.
warmup.
(0· -55 ·C)
-7 %
2x10 /10 line
voltage change.
Tuning Control: Frequency control mechanism
provides a In a i n dial calibrated in MHz and a
vernier dial for interpolation purposes. Total
scale length approximately 45 inches. Calibra-
tion: every othe rMHz from 13U to 27U MHz;
every 5MHz above 270 MHz.
Leveling: Internal feedback circuit retains "AT-
TENUATOR CALIBRATED" reference on RF
output meter over wide frequency ranges (typi-
cally octave bands). Adjustment of front panel
AMP. TRIMMER control (only) for maximum
RF output indication automatically restores ini-
tial carr.ier level for greater frequency changes.
Impedance: 50n; reflection coefficient <0.091
(1. 2SWR, 20.8 dB return loss) for attenuator
setting below -7 dBm.
)
Resettability: Main frequency control resettability
better than ±G. 1% after initial warmup. FINE
FREQUENCY ADJUST prOVides approximately
±25 kHz settabilityat 480 MHz (proportionately
finer adjustment at lower frequencies).
RFI: Meets all conditions specified in MlL-I-
618m; permIts receiver sensitiVity measure-
ments down to at least 0.1 /lV.
Auxiliary RF Output:
Crystal Calibrator: Provide s frequency check
points every 1MHz up to 270 MHz or every
5MHz over the range of the instrument. Head-
phone jack provided for audio frequency output
(headphones not incluC1ed). Crystal frequency
accuracy better than 0.01% at normal room
temperatures. Cursor on frequency dial adjust-
able over small range to aid in interpolation ad-
justment. -Calibrator maybe turned off when not
in use.
Residual FM: <±5 parts tn 10
7
in a10 kHz post-
detection bandwidth.
Harmonic Output: At least 35 dB below the carrier
for harmonic frequencies below 500 MHz.
Frequency Control Input: (608F only). The 608F
FREQ CONTROL INPUT normally used with the
8708A Synchronizer can also be use d for ex-
ternal frequency control by varying adc voltage
608E
Fixed Ie ve I CW signal from RF oscillator
(minimum amplitude 180 In V rms into 50n)
provided at front panel ENC female connector
for use with external equipment (e.g., fre-
quency counter).
608F
cw signal from RF Oscillator pro vi de d at
front panel ENC female connector. Powe r
levels into son are as follows:
10 to 215 MHz: -1. 8 to +7 dBm
215 to 400 MHz: +2. 0 to +6 dBm
400 to 430 MHz: +1. 0 to +5 dBm
Signal for use with HP 8708A Synchronizer or
othe r external equipment (e.g., frequency
counter).
)
1-2

Model 608E/F Section I
Table I-I. Specifications (Cont.)
MODULATION CHARACTERISTICS
(Front-panel AMP. TRIMMER control adjusted for
maximum indication of RF Output Meter and RF
Output Meter set to Attenuator Calibrated.)
Internal AM
Frequency: 400 and 1000 Hz, ,:tl0%. Modula-
latton signal available at front panel BNC fe-
male connector for synchronization of external
equipment.
--.
,
".,
~"
"~'_I"'OOOU'" , .. u. .... """,
GENERAL
608E and
608F
Power: 115 or 230 V .±IO%, 50 to 400 Hz. Approxi-
mately 220 W.
Dimensions
CabinetMount: 13-1/4 in. (337 mm) wide, 16-3/4
in. (416 mm) high, 21 in. (533 mm) deep.
Rack Mount:
Above 220 MHz, combined
rise and decay time
less than 2. 5 ~s.
On-Off Ratio: At least 20 dB [or pulsed carrier
levels o( O. 5 V and above.
Input ReqUired:
Positive pulse, 10-50 Vpeak;
input
impedance 2kn.
608F
Modulation Level: 0 to
95% modulation with
Output
Attenuator at
0.224 V (1 mW) or be-
low; continuously ad-
justable with front-
panel MOD LEVEL
control.
Carrier Envelope Distortion: Less than 2% at
30% AM and less than 5% at 70% AM.
608E
Modulation Level: 0
to
95% modulation at
carrier levels 0.5 V
and below; continu-
ously adjustable with
(ront-panel MOD
LEVEL control.
•
Modulation Meter
Accuracy: ±5% o(full scale 0 to 80%, .±.IO% from
80% to 95% «(or lNT AM or 20 Hz to 20 kHz
EXT
AM).
Incidental Frequency Modulation (at 400 and 1000
Hz modulation)
Less than 1000 Hz peak at 50% AM for frequen-
cies above 100 MHz. For frequencies below
100 MHz,
less than 0.001% at 30% AM.
External Pulse Modulation
Rise and Decay Time: From 40 MHz to 220 MHz,
combined
rise and decay time less than 4 ~s.
.i f-
" I
t:k
'''.0'
RUR
".
Weight
Cabinet Mount: Net,
62 Ib (28 kg). Shipping, 74
Ib (33, 4kg).
Rack Mount: Net, 62 lb (28 kg). Shipping, 83 lb
•(37, 4kg).
Accessories Available
11508AOutputCable prOVides 50- n. termination
and standard binding posts at the end of a24-
inch (610 mm) length of
cable. Allows direct
connection o( the signal generator to hlgh im-
pedance circuits.
11509A Fuse Holder provides protection for the
output attenuator when the 608 is used for trans-
ceiver tests.
10514A Mixer foruseas nanosecond pulsemodu-
lator or balanced modulator.
10515A Doubler for extending the frequency range.
608F
Modulation Level: 0 to
95% modulation with
Output
Attenuator at
0.224 V(1 roW) or be-
low; continuously ad-
justable with front-
panel MOD LE VEL
control. Input re-
quired: 1 to 10 V
rms (1 knlnput
lmpedance).
Carrier Envelope DistorUon: Less than 2% at
30% AM, less than 5% at 70% AM (modulation
source distortion less than O. 5%).
External control o( carrier level can be achieved
through application o( dc voltage in EXT AM
mode.
Modulation Level: 0
to
95% modulation at
carrier levels 0.5 V
and -below; continu-
ously adjustable with
front-panel MOD
LEVEL control. In-
put requlred: 1 to 10
V rms (1 kninput
impedance).
External AM
Frequency: 20 Hz to 20 kHz.
608E
1-3

Model 608E/F
SECTION II
INSTALLATION
Section n
•
'.
2-1. INCOMING INSPECTION.
2-2. This instrument was inspected mechanically and
electrically prior to shipment. Inspect for mechani-
cal damage received in transit and test electrical per-
formance using procedures given in SectionV. If there
is damage or deficiency, or if electrical performance
is not within specif1cations. notify the carrier and your
Hewlett-Packard sales and Service Office immediately
(see 11st at rear of this manual.)
2-3. PREPARATION FOR USE.
2-4. POWER REQUIRE~{ENTS.
2-5. The VHF Signal Generator requires apower
source of 115 or 230 volts ac .!.lo%, single phase,
which can supoly approximately 220 watts. A two-
position slide switch, on the inside rear chassis, per-
mits operation from either a115- or 230-volt power
soorce. The number visible on the switch slider in-
dicates the line voltage for which the signal generator
is connected. The correct fuse rating for each line
voltage is adjacent to the switch. To prepare the sig-
nal generator for operation, position the 115-230 volt
switch so that the number visible on the slider cor-
responds to the available line voltage, and install a
fuse of
correct r~t\.rZ ~::'!:."r~-:"! on rear apron).
CAUTION
Before connecting the power cable, set the
115-230 volt
switch for the line voltage to be
used.
2-6. POWER CABLE.
2-7. To protect operating personnel, the National
Electrical Manufacturers' Association (NEMA) rec-
ommends that the instrument panel and cabinet be
grounded. This instrument is equipped with a three-
conductor power cable Which, when plugged into an
appropriate receptable, grounds the instrument. The
off-set pin of the three-prong connector is the ground
pin.
To preserve the protection feature when operating
the instrument from a two-contact outlet, use a three-
prong to two-prong adapter (Hewlett- Packard Stock No.
1251-0049) and connect
the green pigtail on the adapter
to ground.
2-8. REPACKING FOR SHIPMENT.
2-9. If the signal generator is to be packaged for
shipment use the original shipping container and pack-
ing materials. U these have been discarded or are not
in condition
for reuse, obtain new materlals from your
local Hewlett- Packard sales and Service Office (see
rear of this manual for locations), or follow these
general instructions:
a. Wrap the signal generator in heavy paper or
plastic. (IT the signal generator is being shipped to a
Hewlett-Packard service facility, attach a tag indicat-
ing type of servicing required, return address, model
number, and full serial number.)
b. Use a strong shipping container. A carton made
of 500-600 DOUnd test material will usually provide
adequate protection.
c. Use enough shock-absorbing material (3 to <4
inch layer) around all sides of instrument to provide
firm cushion and prevent movement inside the con-
tainer. Protect the control panel with cardboard.
With Hewlett-Packard "noater pack" packaging, the
foam
blocks prOVide sufficient shock protection, and
additional
material is unnecessary.
d. Seal the shipping container securely.
e. Mark the shipping container "FRAGILE" to
assure careful handling.
2-10.
In any correspondence refer to the signal gen-
erator by model number and full serial number.
2-1

Model 608E/F
SECTION III
OPERATION
Section ill
•
3-1. INTROOUCTION.
3-2. This section provides operating instructions
for the Model 60sE and 608F SIgnal Generators. In-
cluded are a listing of controls, indicators and con-
nectors, pre~operation procedures, mode operating
procedures, and phase-lock operation procedures
(Model 608F only). Controls and indicators on both
instruments are nearly identical; therefore, an illus-
tration of the Model 608F will be referenced during
this discussion, with the difference between instru-
ments identUied.
3-3. CONTROLS. INOICATORS ANO
CONNECTORS.
3-4. Except for the 115/230 volt power switch, all
controls, indicators, and connectors are located on the
front panel. Figure 3-1 locates and provides afunc-
tional description of each front-panel mounted con-
trol, indicator and connector. The 115-230 volt power
switch is located inside the rear panel and is not
shown.
3-5. PRE-OPERATION PROCEOURES.
3-6. Prior to use, certain procedures must be com-
pleted to obtain maximum' accuracy during operation
of the instrument. Consideration must be given to the
possibility ofRFloading, and calibration of the instru·
ment is required. During the following discussion,
each control used will be identified by an item number
that is referenced to Figure 3-1.
3-8.
A reSistive load of 50 ohms is used at the factory
during calibration of the Attenuator Control dial.
Therefore, for an accurate indication of output power
the external load should be 50 ohms resistive. The
internal impedance of the generator is close to 50 ohms,
with a maximum VSWR of 1.2 exiSting when the gen-
erator is terminated in 50 ohms. This VSWR will have
no important eUect on the accuracy of the Attenuator
Control calibration. However, a severe mismatch
between the instrument and load will produce a con-
siderable difference between the output voltage se-
lected on the Attenuator Control dial and the actual
voltage impressed across the external load. Partic-
ular care should be exercised in the selection of
coaxial cormectorS. A coaxial connector that has
been improperly assembled can produce a substantial
increase in the standing-wave ratio.
3-9. TURN-ON PROCEDURES.
3-10. Turn-on procedures for the signal generator
are as follows:
CAUTION
Do not obstruct the ventilating louvers on the
side of the instrument cabinet. safe operat-
ing temperature requires free air flow through
the louvers.
a. Set AC POWER switch (item 12) to the OFF
position.
b. Check position of 115-230 volt power switch
(refer to paragraph 2-5) on rear of chassis.
•
3-7. RF OUTPUT LOADING.
CAUTION
Do not connect any source of RF or dc power
to the RF OUTPUT connector on the signal
generator. To do so may permanently dam-
age the Impedance-matching network in the
Attenualor Section. Particular care must be
observed when testingtransceiver-type equip-
ment to insure that the transmitter remains
inactive while the equipment is connected to
the signal generator.
NOTE
To protect the Attenuator when there is a pos-
sibility of voltage being applied to the RF
OUTPUT cormector, aModel 11509A Fuse-
holder is reoommended. The fuseholder is
connected between the test cable and RF OUT-
PUT connector.
c. Set MODULATION selector switch (item 20) to
CW position.
d. Set RF OUTPUT control (item 5) full clockwise
(maximum).
e. Set AC POWER switch to ON position.
f. Warmup equipment for 10 mirrotes prior to use.
If greater frequency stability is required, extend
warmup period to 60 minutes.
3-11. CALIBRATION PROCEDURES.
3-12. Prior to operation certain calibration of the
instrument may be deemed necessary. The follow-
ing
discussion contains frequency and power output
calibration procedures.
3- 13. FREQUENCYCALIBRATION.'I1lefrequency(MEGA-
CYCLES) dial in the signal generators are calibrated ta be
accurate within ±O.5% for the 608E and ±l9b for the 608F.
3-1

Section III
3--!~'l
4
6--"1:
5
7
10---
9
11
12
8
13
(S08F
21
Model 608E/F
16
,
u __
17
18
f--~itI=!---19
fitlH---
20
~~:JI
21
---22
23
(608F ONLY)
)
•
•
)
14 15 26
25 24
1. Cursor knob: Positions cursor on the MEGA-
CYCLES (frequency) dial.
2. PERCENT MODULATION meter: Indicates
the percent of modulation of the RF output
signal.
3. Panel marker: Scribed mark for cursor align-
ment.
4. ZERO control: Screwdriver adjustment to
electrically zero the PERCENT MODULA-
TION meter.
5. RF OUTPUT control: Controls RF power input
to the attenuator. Also controls output power
levels between +7 dBm and +13 dBm in the
Model608E.
)
Figure 3-1. Front Panel Controls, Indicators, and Connectors
3-2

Model 608E/F
Section m
7. FINE FREQ control: Used for fine frequency
adjustments
6. MODULATION control: Adjusts the percent of
modulatioo ct the RF output signal as observed
on the PERCENT MODULATION meter.
.
8. FREQUENCY RANGE switch: Five-position
switch used to select the desired frequency
range. Also positions the range pointer on the
dial. Switch positions are as follows:
10.
DC .25 AMP fuse: Oierload protective device
for the +225 Vdc power supply.
9.
AC POWER lamp: Indicates when ac power is
applied to the instrument.
•
RANGE
A
B
C
D
E
MODEL608E
10-21 MHz
21-43 MHz
43-95
MHz
95-215 MHz
215-480 MHz
MODEL 608F
10-21
MHz
21-44 MHz
44-95 MHz
95-210 MHz
210-455 MHz
19. AMPL TRIMMER
control: A two-function con-
trol for peaking the RF output. During pulse
modulation, the control is tuned without push-
ing to peak the RF ootput. When sine-wave or
CW operations are conducted, the control is
pushed and then tuned.
20. MODULATION switch: A
six-position switch
that sets the instrument mode of operation.
The switch posit~ons are identified as follows:
PULSE:
Sets the instrument for external pulse
modulation.
PULSE
SET RF OUTPUT: Used to establish
the instrument operating point for external
pulse mo<h.llation.
AM:
sets the instrument for external sine-
wave modulation.
1000 - :
Sets the instrument for internal AM
modulation at 1000 Hz.
400 .. :
Sets the instrument for internal AM
modulation at 400 Hz.
11.
AC LINE fuse: Protective device between the
instrument and the ac power source.
12. AC POWER ON switch: Controls application
of ac power to the instrument.
13. FREQ CONTROL rNPUT connector (Model
608F only): input
connector for the dc control
voltage when the instrument is used with a
Model 8708A
Synchronizer.
14. AM/PULSE MOD INPUT connector: Input con-
nector
for AM or pulse signals during external
sine-wave or pulse operation. During internal
sine-wave modulation, a400 or 1000 Hz signal
is available at the connector for synchronizing
external equipment.
15. UNCAL RF OUTPUT connector: Ultput con-
nector in the 608E delivers an uncalibrated,
unmodulated RF signal to external equipment.
In the Model 608F used with the Model 8708A
Synchronizer, output connector delivers an
uncalibrated FM signal.
16. MEGACYCLES dial: Indicates selected fre-
quency range and frequency in MHz.
17.
RF OUTPUT meter: Indicates level of RFpo-
wer applied to the attenuator as selected by
operation of the RF OUTPUT control. Also
used in conjunction with the AMPL TRIM:MER
control to peak the RF output signal.
18. Frequency control: Used to select the output
frequency within afrequency range as observed
on the MEGACYCLES dial.
CW: Sets the instrument to provide aCW output.
21. XTAL CAL GAIN
control: Controls audio level
of beat-frequency output at the XTAL CAL
OUTPUT
connector.
22. Attenuator control: Controls RF ootput levels
of +7 dBm and below. OJtput levels selected
by use of the Attenuator Control are accurate
as long as the RF OUTPUT meter needle indi-
cates +7 dBm (ATTENUATOR CALIBRATED).
23.
RF OUTPUT connector: OJtput cOlUlector for
the calibrated RF signal (refer to CAUTION,
paragraph 3-7).
24. XTAL CAL switch: Three-position tog g Ie
switch used when performing frequency cali-
brations. Switch positions are a s follows:
1MC:
Provides 1MHz checkpoints from 10
to 270 MHz.
5MC:
Provides 5 MHz checkpoints from 10-
480 MHz in
the Model 608Eand from 10-455
MHz
in the Model 608F.
OFF: De-energizes oscillator circuits.
25. FREQ ANALOG OUTPUT connector (Model
608F only):
Delivers a resistance proportional
to frequency to the Model 8708A Synchronizer
during phase-lock operation.
26. XTAL CAL OUTPUTCOlUlector: Supplies cal-
ibrating signals to an operator for frequency
calibration. Accommodates an earphone plug.
Figure 3-1. Front Panel Controls, Indicators, and Connectors (Cont.)
3-3

Section III
To obtain higher accuracy, a crystal-controlled cali-
brator has been included to provide a means of cali-
brating the instrument at any multiple of 1 MHz
between 10 and 270 MHz, or any multiple of 5 MHz
acr088 the frequency range of the instrument. Pl'oce-
dures to crystal-calibrAte the instrument are as
follows:
a. Conduct turn-on procedure8listed in paragraph
3-9.
b. Connect headphone8 (not supplied) to the XT AL
CAL OUTPUT connector (item 26).
c. Set XTAL CAL switch (item 24) to 1MC or 5MC
as applicable.
d. Rotate frequency control (item 18) until MEGA-
CYCLES
dial (item 16) is set on the 1 MHz or 5 MHz
checkpoint nearest the frequency to be used.
e. Adjust XTAL CAL GAIN control (item 21) for a
comfortable audio level in headphones.
NOTE
Extraneous beat notes generated by RF
harmonics may be eliminated by properly
setting the RF OUTPUT control (paragraph
3-10, 8tepd) and the XTALCALGAIN control
(paragraph 3-13, step e).
f. Slowly rotate frequency control around the
selected checkpoint until a null (zero beat) is reached.
g. Rotate Cursor Knob (item 3) until cursor is
aligned on MEGACYCLES dial with zero-beat point
achieved in step f.
h. Rotate frequency control until 8elected fre-
quency on MEGACYCLES dial appear8 di-re.:t!y ..;.::::.~.;=
cursor.
i. Set XTALCALswitch to OFF.
3.14. A FINE FREQ control (item 7) is located on the
instrument front panel for making minor frequency
adju8tments. During normal operation no adjustment
of the FINE FREQ control i8 required, and the knob
arrow should be aligned with the front-panel marker.
For a preci8ion frequency selection u8ing a frequency
counter, the FINE FREQ control is used after the fre-
quency has been selected by U8e of the frequency con-
trol. Tuning the knob arrow counterclockwise from
the panel marker lowers the frequency, while aclock-
wise rotation rai8es the frequency.
3-15. POWER OUTPUT CAUBRATION. The RF
leveling circuit in the in8trument maintains a flat RF
output over wide frequency range, with proper initial
adju8tments. The8e adjustments are conducted using
the RF OUTPUT and AMPL TRIMMER controls in
conjunction with the RFOUTPUTmeter. The take-off
point for the detected RF signal displayed on the RF
OUTPUT meter is at the input circuit of the attenua·
tor. Therefore, calibrating the RF output into the at·
tenuator ensures that subsequent operation of the at-
tenuator control will produce an accurate calibrated
RF output from the attenuator. RF output calibration
procedure8 are a8 follows:
3-4
Model 608E/F
a. Conduct turn·on procedures listed in paragraph
3-9.
b. Set the MODULATION 8witch (item 20) to the
CW position.
NOTE
For maximum aCi:uracy, power output cali-
bration8 should be conducted with the in-
8trument 8et in the CW mode.
c. Set the FREQUENCY RANGE switch (item 8) to
the desired range.
d. Tune the frequency control (item 18) five turn,
in from the low end ofthe selected frequency range as
indicated on the MEGACYCLES dial (item 16).
e. Adjust the RF OUTPUT control (item 5) for an
indication on the RF OUTPUT meter (item 17).
f. Depre88 the AMPL TRIMMER control (item 19)
and tune for a peak RF indication on the RFOUTPUT
meter.
g. Readjust the RF OUTPUT control until the RF
OUTPUT meter pointer ie aligned with the +7 dBm
(ATIENUATOR CAUBRATED) mark.
NOTES
To calibrate range "E" tune to top of band
and repeat step8 e through g, before proceed-
ing on to step h.
The RF OUTPUT control may be adjusted to
a
value >+7 dBm (RF OUTPUT meter read-
ing); however, for maximum tube life it is
recommended that the level be reduced when
the higher level is not needed.
h. Tune the frequency control across the selected
frequency range. The RF OUTPUT meter pointer
8hould remain aligned with the ATTENUATOR CAL-
IBRATED
mark.
NOTE
If the pointer does not remain aligned with
the ATIENUATOR CALIBRATED mark, the
leveling circuit is not functioning properly.
Stop tuning and readjust the AMPL TRIM-
MER control to restore leveling. The latter
adjustment is made without depressing the
control.
i. Proceed with operating adjustments listed in
paragraphs 3-18 and 3-20.
3-16. MODE OPERATING PROCEDURES.
3-17. The signal generator8 have four operating
modes identified as CW operation, internal sine-wave
modulation, external sine-wave modulation, and ex-
ternal pulse modulation. In addition, the RF output level
)
,
)
•
,
.J

•
'-.
Mode1608E/F
eetabliehed for CW operation can be remotely con-
trolled by an externally eupplied de control voltage.
The following diecueeion combines locally controlled
CW operation and internal sine-wave modulation into
operating instructions used with internally generated
signals, external sine-wave modulation, external
pulse modulation and remote-controlled CW opera·
tion. These operating procedures are used with exter·
nally supplied signals.
3-18. INTERNAL MODULATION.
3-19.
The signal generators provide internal facHi·
tiee to
produce aCW output, or selection of either a400
Hz or 1000 Hz sine·wave modulated signal output.
Figure 3-2 illustrates and provides instructions for
proper operation of the controls, indicators, and con-
nectors used with internally generated signals.
3-20. EXTERNAL MODULATION
3-21.
The signal generators operate with externally
supplied signals which are used to modulate the
internally developed RF carrier. Also, an external de
voltage can be applied to provide remote on-off control
of the RF carrier output from the instruments. Figure
3-3 illustrates and describes the operation of control8,
Section III
indicators, and connectors used in the three opera-
tions.
3-22. PHASE-LOCK OPERATING PROCEDURES
(MODEL 608F ONLY).
3·23. The RF Generator section in the Model 60SF
signal generator is designed for phase-lock operation
with the Model 8708A Synchronizer_ This method of
operation provides a highly stable output from the
instrument, and require8 only normal control adjust-
menta followed by cable connections between the sig-
nal generator and synchronizer. Figure 3-4 illu8trates
and describes operation of controls, indicators and
connectors on the Model608F when the instrument is
used in phase-lock operation.
3-24. Configuration of the RF Generator Section in
the Model 60BF signal generator also permits the in·
strument to be used in narrow· band frequency or
phase modulation operations. In this application,
consideration must be given tothe internal bias of -22
volta de on the FREQ CONTROL INPUT connector,
and the input impedance of approximately 5K ohms.
A blocking capacitor must be added to the input cir-
cuit for passing the modulating signal while prevent-
ing any change in the reference reverse bias applied to
the varicap diodes.
-

Section ill
14~-_
8
12
2
3
1
HE If l ( r r ~ ~ • ( I , I D.
6
Model 608E/F
1-----7
11
1-_-
4
13
~~-9
10
5
)
•
)
)
3-6
Figure 3-2. Controls, Indicators, and Connectors Used
in Operation with Internally Generated Signals

•
Model 608E/F
CW OPERATION
NOTE
Perform turn-on procedures listed in para-
graph 3-9.
1. Align cursor knob with panel marker.
2. Align nNE FREQ control with panel marker.
3. Set FREQUENCY RANGE switch to desired
range (frequency limits for each range shown
on MEGACYCLES dial housing).
4. Set MODULATION switch to the CW position.
CAUTION
Do not connect any source ofRF or de power
to the RF OUTPUT connector on the signal
generator. Todo so may permanently dam-
age the impedance-matching network in the
Attenuator Section. Particular care must
be observed when testing transceiver-type
equipmentto insure that the transmitter .re-
mains inoperative while the equipment is
connected to the signal generator (refer to
NOTE in paragraph 3-7).
5. Connect the equipment under test to the RF
OUTPUT connector observing that the signal
generator is terminated in the proper load
(refer to paragraph 3-8).
NOTE
If deemed necessary, conduct power out-
put calibration procedures for the selected
frequency range as listed in procedural
steps d. through h. in paragraph 3-15.
6. Tune the Frequency Control until MEGA-
CYCLES dial cursor is aligned with frequency
to be used as indicated on dial face.
NOTE
To crystal calibrate the frequency dial, refer
to procedures listed in paragraph 3-13.
Section III
7. Depress and tune AMPL TRIMMER control
for maximum indication on RF OUTPUT meter.
8. Adjust RF OUTPUT control until RF OUTPUT
Meter pointer is aligned with +7 dBm mark
(ATTENUATOR CALIBRATED).
NOTE
Accuracy of the Attenuator Control setting
and PERCENT MODULATION -JIleter are
within specifications onlywhen the RF OUT-
PUT meter is indicating ATTENUATOR
CAUBRATED.
9. Adjust Attenuator Control for desired output
level of +7 dBm or below.
NOTE
To select RF output levels from +7 dBm to
+13 dBm in the Model 608E, perform steps
10 through 12. In this operation, the RF
OUTPUT meter pointer is used in lieu of
the Attenuator Control to indicate the power
output level.
10. Adjust the Attenuator Control to the +7 dBm dial
mark.
11. Check that the RF OUTPUT meter pointer in-
dicates ATTENUATOR CALIBRATED.
12. Adjust RF OUTPUT control for desired out-
put level above +7 dBm as indicated by the RF
OUTPUT meter pointer.
INTERNAL SINE-WAVE MODULATION
NOTE
Steps 1 through 12, as applicable, must be
completed before seiting the instrument for
internal sine-wave AM modulation.
13. Set MODULATION switch to 400 - or 1000
... position as desired.
14. Adjust MODULATION control for desired
rnodulationpercentage as indicated on the PER-
CENT MODULATION meter.
Figure 3-2. Controls, Indicators and Connectors Used
in Operation with Internally Generated Signals (Cont.)
3-7

Section m
1
8
12
15 _
19
2--
3- __
14- __
18
21
EXTERNAL SINE-WAVE MODULATION
NOTE
Perform turn-on procedures listed in para-
graph 3-9.
Model 608E/F
6
--'J--;71
11
4
13
16
11
20
L--~O
22
5
1. Align cursor knob with panel marker.
2. Align FINE FREQ control with panel marker.
3. Set FREQUENCY RANGE switch to desired
range (frequency limits for each range shown
on
ME~ACYCLES dial hOUSing).
)
)
•
)
Figure 3-3. Controls, Indicators, and Connectors Used in
Operation with Externally Supplied Signals
3-8

Model 608E/F
4. Set MODULATION switch to CW position.
CAUTION
Do not connect any source of RF or de power
to the RF OUTPUT connector on the signal
generator. Todosomay permanently dam-
age the impedance-matching network in the
Attenuator Section. Particular care must
be observed when testing transceiver-type
equipment to insure that the transmitter
remains inoperative whUe the equipment is
connected to the signal generator (refer to
NOTE in paragraph 3-7).
5. Connect the equipment under test to the RF
OUTPUT connector observing that the signal
generator is terminated in the proper load
(refer to paragraph 3-8).
NOTE
If deemed necessary, conduct power output
calibration procedures for the selected fre-
quency range as listed in procedural steps
d. through h. in paragraph 3-15.
6. Tune Frequency Control until MEGACYCLES
dial cursor is aligned with frequency to be used
as indicated on dial face.
NOTE
To crystal calibrate the frequency, refer to
procedures listed in paragraph 3-13.
7. Depress and tune AMPL TRIMMER control for
maximum indication on RF OUTPUT meter.
8. Adjust RF OUTPUT control until RF OUTPUT
meter pointer is aligned with +7 dBm mark
(ATTENUATOR CALIBRATED).
NOTE
Accuracy of the Attenuator Control setting
and PERCENT MODULATION meter are
within specifications only when the RF OUT-
PUT meter is indicating ATTENUATOR
CALIBRATED.
9.
Adjust Attenuator Control for desired output
level of +7 dBm or below.
NOTE
To select RF output levels from +7 dBm to
+13 dBm in the Model G08E, perform steps
10 through 12. In this operation, the RF
OUTPUT meter pointer is used to indi cate
the power output level in lieu of the Attenu-
ator Control.
10. Adjust the Attenuator Control to the +7 dBm
dial mark.
Section ill
11. Check that the RF OUTPUT meter pointer in-
dicates ATTENUATOR CALIBRATED.
12.
Adjust the RF OUTPUT controliorthe desired
output level above +7 dBm as indicated by the
RF OUTPUT meter pointer.
13. Set the MODULATION switch to the AM posi-
tion.
14. Connect the external sine-wave generator to
the AM/PULSE MOD lliPUT connector and set
generator for a sine-wave input between 20 Hz
and 20 kHz.
15. Set MODULATION control for desired percent-
age of modulatlon as observed on the PER-
CENT MODULATION meter.
EXTERNAL PULSE MODULATION
NOTE
Perform turn-on procedures if required,
and complete steps 1 through 3.
16. Set MODULATION
switch tothe PULSE/SET
RF OUTPUT position.
NOTE
Perform steps 5 through 12 as applicable.
17. Set the MODULATION switch to the PULSE
position.
18. Connect the external pulse generator to the
AM/PULSE MOD INPUT connector and set
generator for an input pulse level above 10
volts peak-to-peak.
EXTERNAL DC CONTROL
NOTE
Perform turn-on procedures if required,
and complete steps I through 8.
19. Set
the MODULATION control to a maximum
clockwise position.
20. Set MODULATION switch to the AM position.
21. Connect external power source to AM/PULSE
MOD INPUT connector.
NOTE
Voltages required for external control of
the RF carrier are +15 volts dc for full-on
operation and -15 volts dc for full-off opera-
tion.
22. Adjust Attenuator Control and de control volt-
age input for desired RF output leveL
Figure 3-3. Controls, Indicators and Connectors Used in
Operation with Externally Supplied Signals (Cant. )
3-9

Section III
8 __
2
3
12
1
10
11
6
,
Model 608E/F
7
4
5
)
)
J
3-10
Figure 3-4. Controls, Indicators, and Connectors Used
in Phase-Lock Operation (Model 608F Only)