HP 8447A Service manual

WLjm HEWLETT
m.EM PACKARD
OPERATING AND SERVICE MANUAL
8447A
AMPLIFIER/
DUAL AMPLIFIER
1—400 MHz
SERIAL PREFIX: 955
This manual applies directly to HP Model 8447A
Amplifier and Model 8447A-001 Dual Amplifier
having serial prefix number 955.
SERIAL PREFIXES NOT LISTED
For serial prefixes above 955, a “Manual Changes”
sheet is included with this manual.
©HEWLETT-PACKARD COMPANY 1970
1400 FOUNTAIN GROVE PARKWAY, SANTA ROSA, CALIFORNIA, 95404, U.S.A.
MANUAL PART NUMBER 08447-90003
Printed: APRIL 1970

p MANUAL IDENTIFICATION -|
Model Number: 8447A
‘Date Printed: APRIL 1970
Part Number: 08447-90003
This supplement contains important information for correcting manual errors and for adapting the manual to
instruments containing improvements made after the printing of the manual.
To use this supplement:
Make all ERRATA corrections
Make ail appropriate serial number related changes indicated in the tables below.
_ Serial Prefix or Number.
1145A0G356A thru
-01517, -01566, and
4)1571
. Make Manual Changes
Spriul Pr^fiv nf MumKut
1145 A01518 thru
-01565,4)1567 thru
4)1570,4)1572 thru
-01575, and 1529A
prefix
1,2
1616A 1,2,3
1644A
1,2,3,4
1937A
1,2,3,4,5
2123 A
1,2,3,4,5,6
2123A06657 and 2439A
1,2,3,4,5,6,7
NEW ITEM
Manual change supplements are revised as often as necessary to keep manuals as current and accurate as possible.
Hewlett-Packard recommends that you periodically request the latest edition of this supplement. Free copies are available
from all HP offices. When requesting copies quote the manual identification information from your supplement, or the model
number and print date from the title page of the manual.
Printed in U.S.A.

ERRATA
Add to front of manual SAFETY CONSIDERATIONS supplied in this Manual Changes
supplement.
Page 1-1, Table 1-1:
Add Reverse Isolation: >30 dB.
Page 3-1, Paragraph 3-7:
Add the following caution before the first sentence in step c:
CAUTION
The input to the HP 8447A amplifier is very susceptible to damage from
electrostatic discharge. Before connecting any coaxial cable to the input
jack of the amplifier, make certain that static electricity buildup in the
cable is completely discharged.
Page 4-1, Paragraph 4-5:
Add the following caution:
CAUTION
The input to the HP 8447A anplifier is very susceptible to damage from
electrostatic discharge. Before connecting any coaxial cable to the input
jack of the amplifier, make certain that static electricity buildup in the
cable is completely discharged.
Page 4-2, Paragraph 4-6:
Add 10 dB attenuator (2 required) ... HP 8491 Opt. 010 to the equipment list.
Change specification for "Output Level (Compression)" to >+7 dBm at 1-dB compression
point.
Page 4-3, Paragraph 4-6:
Change step 6 to read as follows:
To check flatness, set the signal level at Channel A to -30 dBm. Connect a 10 dB
attenuator to each tee, between the tee and the adapter. Note the level difference
between Channel A and Channel B as the generator frequency is tuned from 10 MHz to
400 MHz. Keep the input level to the amplifier (CHANNEL A) constant and note the
variation in Channel B. Channel B should change >1 dB (+-0.5 dB).
Page 4-5, Paragraph 4-7:
Under SPECIFICATION, change "parts" to "ports".
Page 4-10, PERFORMANCE TESTS:
Add performance test 4-10, Reverse Isolation, supplied in this Manual Changes
supplement.
Page 4-11, Table 4-1:
Add Reverse Isolation information to Performance Test Record, supplied in this
Manual Changes supplement.
Page 5-2, Paragraph 5-8:
Change "Figure 4-1" to "Figure 5-1" in step 1.
Page 6-2, Table 6-2:
Change C2 to HP Part Number 0160-2049, Check Digit 1, CAPACITOR-FDTHRU 5000PF +80
-20% 500V.
Change A1CR1-4 to HP Part Number 1901-0743, Check Digit 1, DI0DE:PWR RECT IN4004
400VIA DO-41. '
2

Page 6-3, Table 6-2:
Change U1 and U2 to HP Part Number 5086-7032, Check Digit 5.
Change HP Part Number 1200-0043 to HP Part Number 0340-0664, Check Digit 4,
INSULATOR-XSTR T0-3.
Page 6-4, Table 6-2:
Change Reference Designation 8 to HP Part Number 08447-00054, Check Digit 3,
PANEL:FRONT STANDARD*
Add Reference Designation 3, HP Part Number 08447-00055, Check Digit 6, PANEL : F R0NT
OPTION 001.
Page 6—5, Table 6—3:
Change HP Part Number 1820-0169 to HP Part Number 5086-7032, Check Digit 9.
Change HP Part Number 1901-0159 to HP Part Number 1901-0743, Check Digit 1,
DIODE:PWR RECT IN4004 400VIA D-41.
Change HP Part Number 08447-00001 to HP Part Number 08447-00054, Check Digit 5,
PANEL:FRONT STANDARD.
Add HP Part Number 08447-00055, Check Digit 6, PANEL:FR0NT OPTION 001.
Change HP Part Number 1200-0043 to HP Part Number 0340-0664, Check Digit 4,
INSULATOR-XSTR T0-3.
► P a ge 8-9, Figure 8-3:
Replace Figure 8-3 with the new Figure 8-3 included in this Manual Changes
supplement.
Page 8-9, Figure 8-4:
Change wire colors of T1 power transformer primary windings as follows: 90 (top
winding) to 902, 904 to 905, and 905 to 904.
Delete line connecting CR8 and C4.
CHANGE 1
Page 6-4, Table 6-2:
Change Cabinet Parts Lists to read as supplied in this Manual Changes supplement.
CHANGE 2
Page 1-1, Table 1-1:
Change the following specifications:
Output Level: >+6 dBm at 1-dB compression point.
Distortion: Harmonics at least 32 dB down at output levels up to 0 dBm.
Page 4-2, Paragraph 4-6:
Change specification for "Output Level (Compression)" to >+6 dBm at 1-dB compression
point.
Page 4-3, Paragraph 4-6, Step 5:
Change "+7 dBm" to "+6 dBm" in first line.
Page 4-8, Paragraph 4-8:
Change specification to read:
Harmonics at least 32 dB down at output levels up to 0 dBm.
In step 3, change 35 dB to 32 dB (two places).
Page 4-11, Paragraph 4-8:
Change limit under "Min." to -32.
CHANGE 3
Page 6—2, Table 6—2:
Change*A1CR9 to HP Part Number 1884-0073, Check Digit 2, THYRIST0R-SCR T0-5
VRRM=100.'
3

Add A1R13, HP Part Number 0757-0401, Check Digit 0, R:FXD MET FLM 100 OHM U 1/8W.
Page 8-9, Figure 8-4:
Add RIB, 100 ohms, from junction of CR8 anode/CR9 gate to ground.
CHANGE 4
Page 6-3, Table 6-2:
Change SI to HP Part Number 3101-2195, Check Digit 7, SWITCH:PUSHBUTTON DPST
(recommended replacement).
Change XF1 to HP Part Number 2110-0470, Check Digit 5, FUSEHOLDER BODY.
Add the following HP Part Numbers and description:
2110-0465, Check Digit 8, FUSEHOLDER CAP.
2110-0467, Check Digit 0, FUSEHOLDER NUT: HEX.
1400-0090, Check Digit 9, WASHER:FLAT NEOPRENE.
Delete HP Part Number 2950-0038,
Page 6-4, Figure 6-1:
Change Reference Designation 6 to HP Part Number 08447-00050, Check Digit 1.
Page 8-9, Figure 8-4:
Change SI ON/OFF switch as shown in the partial schematic supplied in this Manual
Changes supplement.
CHANGE 5
Page 6-3, Table 6-2:
Change XF1 HP Part Number to 2110-0564, Check Digit 8.
Change FUSEHOLDER CAP HP Part Humber to 2110-0565, Check Digit 9.
Change FUSEHOLDER NUT HP Part Number to 2110-0569, Check Digit 3.
Delete FUSEHOLDER WASHER entry.
CHANGE 6
Page 6-3, Table 6-2:
Change U1 and U2 to HP Part Number 5086-7356, Check Digit 0.
Change W2 to HP Part Number 08447-20006, Check Digit 9, CABLE ASSEMBLY: IN BNC.
Change W3 to HP Part Number 08447-20007, Check Digit 0, CABLE ASSEMBLY: OUT BNC.
Change W4 to HP Part Number 08447-20008, Check Digit 1, CABLE ASSEMBLY: IN BNC.
Change W5 to HP Part Number 08447-20009, Check Digit 2, CABLE ASSEMBLY: OUT BNC.
Add HP Part Number 08447-00028, Check Digit 3, BRACKET: SUPPORT AMPLIFIER (OPTION
001 ) .
Page 6-5, Table 6-3:
Change HP Part Number 1820-0169 (or 5086-7032, see errata) to HP Part Number 5086-
7356, Check Digit 0.
Page 6-6, Table 6-3:
Delete HP Part Number 08447-60003.
Add W2, HP Part Number 08447-20006, Check Digit 9, CABLE ASSEMBLY: IN BNC.
Add W3, HP Part Number 08447-20007, Check Digit 0, CABLE ASSEMBLY: OUT BNC.
Add W4, HP Part Number 08447-20008, Check Digit 1, CABLE ASSEMBLY: IN BNC.
Add W5, HP Part Number 08447-20009, Check Digit 2, CABLE ASSEMBLY: OUT BNC.
Add HP Part Number 08447-00028, Check Digit 3, BRACKET: SUPPORT AMPLIFIER (OPTION
001 ) .
CHANGE 7
Page 1-1, Table 1-1:
Change the Gain specification for the instrument from 20 dB +-0.5 dB to 20 dB -t—1.0
dB.
4

Page 4-2, Paragraph 4-6:
At the top of page 4-2, change the specification for the Gain from 20 dB +-0.5 dB to
20 dB +-0.1 dB.
Page 4-3, Paragraph 4-6:
Page 4-11/4-12, Table 4-1:
In step 4, paragraph 4-6, change the tolerance for recording the data from:
+19.5._+20.5 dB
to:
+19.0_+21.0 dB
5

SAFETY CONSIDERATIONS
GENERAL — This is a Safety Class I instrument
(provided with terminal for protective earthing).
OPERATION — BEFORE APPLYING POWER
verify that the power transformer primary is
matched to the available line' voltage, the correct
fuse is installed, and Safety Precautions are taken
(see the following warnings). In addition, note the
instrument’s external markings which are
described under “Safety Symbols.”
warnings!
Servicing instructions are for use by service-
trained personnel only. To avoid dangerous elec¬
tric shock, do not perform any servicing unless
qualified to do so .
BEFORE SWITCHING ON THE INSTRUMENT,
the protective earth terminal of the instrument
must be connected to the protective conductor of
the (mains) power cord. The mains plug shall only
be inserted in a socket outlet provided with a pro¬
tective earth contact. The protective action must
not be negated by the use of an extension cord
(power cable) without a protective conductor
(grounding). Grounding one conductor of a two
conductor outlet provides no protection.
If this instrument is to be energized via an auto-
transformer (for voltage reduction) make sure the
common terminal is connected to the neutral termi¬
nal of the power source.
Any interruption of the protective (grounding)
conductor (inside or outside the instrument) or
disconnecting the protective earth terminal will
cause a potential shock hazard that could result
in personal injury.
Whenever it is likely that the protection has been
impaired, the instrument must be made inoperative
and be secured against any unintended operation.
Only fuses with the required rated current, voltage,
and specified type (normal blow, time delay, etc.)
should be used. Do not use repaired fuses or short
circuited fuseholders. To do so could cause a shock
or fire hazard.
Do not operate the instrument in the presence of
flammable gases or fumes. Operation of any elec¬
trical instrument in such an environment consti¬
tutes a definite safety hazard.
Do not install substitute parts or perform any un¬
authorized modification to the instrument.
Adjustments described in the manual are per¬
formed with power supplied to the instrument
while protective covers are removed. Energy avail¬
able at many points may, if contacted, result in
personal injury.
Any adjustment, maintenance, and repair of the
opened instrument under voltage should be
avoided as much as possible, and when inevitable,
should be carried out only by a skilled person who
is aware of the hazard involved.
Capacitors inside the instrument may still be
charged even if the instrument has been discon¬
nected from its source of supply.
SAFETY SYMBOLS
Instruction manual symbol: the
product will be marked with this
symbol when it is necessary for
the user to refer to the instruc¬
tion manual in order to protect
against damage to the product.
Indicates hazardous voltages.
Earth terminal (sometimes used
in manual to indicate circuit
common connected to grounded
chassis).
The WARNING sign denotes a
hazard. It calls attention to a
procedure, practice, or the like,
which, if not correctly performed
or adhered to, could result in
personal injury. Do not proceed
beyond a WARNING sign until
the indicated conditions are fully
understood and met.
The CAUTION sign denotes a
hazard. It calls attention to an
operating procedure, practice, or
the like, which, if not correctly
performed or adhered to. could
result in damage to or destruc¬
tion of part or all of the product.
Do not proceed beyond a CAU¬
TION sign until the indicated
conditions are fully understood
and met.
/h
£
WARNING |
CAUTION

General Information
Model 8447A
Figure 1-1. HP Model 8447A Amplifier
Figure 1-2. HP Model 8447A-001 Dual Amplifier

Model 8447A
General Information
SECTION I
GENERAL INFORMATION
1-1. INTRODUCTION.
1-2. This manual contains all information re¬
quired to install, operate, test, adjust, and service
the Hewlett-Packard Model 8447A Amplifier (see
Figure 1-1). This section contains instrument iden¬
tification, description, options, accessories, specifi¬
cations, and other basic information.
1-3. The various sections in this manual provide
information as follows;
SECTION II, INSTALLATION, provides
information relative to incoming inspec¬
tion, power requirements, mounting, pack¬
ing and shipping, etc.
SECTION III, OPERATION, provides in¬
formation relative to operating the instru¬
ment.
SECTION IV, PERFORMANCE TEST,
provides information required to verify
that the instrument is performing in accor¬
dance with published specifications.
SECTION V, ADJUSTMENTS, provides in¬
formation required to properly adjust and
align the instrument after repairs are made.
SECTION VI, PARTS LIST, provides or¬
dering information for all replaceable parts
and assemblies.
SECTION VII, MANUAL CHANGES, nor¬
mally will contain no relavent information
in the original issue of a manual. This sec¬
tion is reserved to provide back dated and
up dated information in manual revision or
reprints.
SECTION VIII, SERVICE, includes infor¬
mation necessary to efficiently service the
instrument.
1-4. INSTRUMENT COVERED BY MANUAL.
1-5. Hewlett-Packard instruments carry an 8-di-
git serial number prefix (see Figure 1-3) on the
back of the panel. When the serial number prefix
on the instrument serial number plate of your in¬
strument is the same as one of the serial prefix
numbers on the inside title page of this manual, the
manual applies directly to the instrument. When
the instrument serial number prefix is not listed on
the inside title page, manual changes sheets and
manual updating information is provided. Later ed¬
itions or revisions to the manual contain the re¬
quired change information in Section VII.
1-6. DESCRIPTION.
1-7. HP Model 8447A Amplifier is a general
purpose, low-noise, wideband amplifier (see Figure
1-1). The 8447A provides 20 dB gain to signals in
50 ohm systems from .1 to 400 MHz.
1-8. The Model 8447A amplifier can be used to
make up resistive probe losses or improve sensitivi¬
ty when used as a preamplifier to a spectrum analy¬
zer or oscilloscope.
1-9. OPTIONS.
1-10. The Model 8447A -001 Dual Amplifier (see
Figure 1-2) is a two-amplifier configuration which
can be operated separately. Each amplifier provides
20 dB gain or the amplifiers can be cascaded by a
front panel patch cable to provide a total gain of
40 dB.
Table 1-1. Specifications
Frequency Range: 0.1 to 400 MHz.
Gain: 20dB±0.5dB*.
Gain Flatness: ±0.5 dB.
Noise Figure: <5 dB, 1 to 400 MHz.
Output Level: >+7 dBm at 1-dB compression
point.
Distortion: Harmonics at least 35 dB down at
output levels up to 0 dBm.
Impedance: 50G both ports, |p| <0.26
(VSWR <1.7).
Power Requirements: 115 or 230 Vac ±10%,
50 to 400 Hz, 15 Watts, 27 VA max.
Weight: Net, 3 lbs, 7 oz.(l,56 kg), shipping: 5
lbs, 1 oz. (2,30 kg)
Dimensions: 8-1/2 inches (216 mm) by 5-1/8
inch (130 mm) by 3-3/8 inches (85,8 mm).
* Measured at 10 MHz.
l-i

General Information
Model 8447A
1-11. EQUIPMENT SUPPLIED.
1-12. The only equipment supplied with the
Model 8447A Amplifier or the 8447A -001 Dual
Amplifier is a 7.5 ft. (2290 mm) power cable.
1-13. EQUIPMENT AVAILABLE.
1-14. Table 1-2 and Table 1-3 list the test equip¬
ment and test equipment accessories necessary to
test, align, and service the Model 8447A Amplifier.
1-15. WARRANTY.
1-16. Certification and warranty information for
the Model 8447A Amplifier and Model 8447A-
001 Dual Amplifier appears on the inside front
cover of this manual.
(
—
A
o
SER.
545 -00000
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j
SERIAL NUMBER PREFIX
SERIAL NUMBER
Figure 1-3. Instrument Identification
Table 1-2. Recommended Test Equipment and Accessories
Instrument Type
Critical Specifications
Recommended Model
Use (Note 1)
Signal Generator
Frequency Range: 10 MHz to 400 MHz.
Output Level: -10 dBm min.
HP 608E/F
P
Test Oscillator
Frequency Range: 100 kHz to 10 MHz
Output Flatness: ±2%
Output: 30 mV
HP 651B
P
Vector Voltmeter
Frequency Range: 10 MHz to 400 MHz.
Bandwidth: 1 kHz.
Sensitivity: 10 mV to 1 Vrms.
Input Impedance: >0.1 megohm.
HP 8405A
P
HP 400E
P, A, T
Dual Directional
Coupler
Frequency Range: 100 MHz to 400 MHz.
Coupling Attenuation: 20 dB nominal.
Directivity: Inc port: 32 dB.
Refl port: 30 dB.
HP 778D
P
Vector Impedance
Meter
Frequency Range: 500 kHz to 100 MHz.
Accuracy: ±2%.
HP 4815A
P
Digital Voltmeter
Range: 50 V
Accuracy: ±1%.
HP 3440A/3443A
A, T
Ohmmeter
Resistance Range: 1 ohm to 100 megohm.
Accuracy: ±10%.
HP412A
T
Cable Assembly
BNC Male to BNC Male 4’ long.
HP 10503A
P
Cable Assembly
Type N
HP 11500A
P
Tee
BNC
UG-274B/U
P
1-2

Model 8447A
General Information
Table 1-2. Recommended Test Equipment and Accessories (contd)
Instrument Type
Critical Specifications
Recommended Model
Use (Note 1)
Tee(2)
50 ohms.
Type N connectors.
HP 11536A
P
Adapter
BNC male to Type N Female
UG-349A/U
P
Termination
50 ohm
HP 11593A
P
Load
50 ohm
HP 908A
P
Low Pass Filter
Cutoff Frequency: 300 MHz.
Telonics TLP
Series
P
Spectrum Analyzer
Frequency Range: 0.5 - 400 MHz
Absolute Amplitude Calibration
Dynamic Range: 50 dB
HP 140A Display Sec¬
tion, Model 8554L
Spectrum Analyzer RF
Section, Mode! 8552A
Spectrum Analyzer IF
Section.
P
Noise Figure Meter
Frequency Range: 200 MHz
Noise Figure Range: 0 to 15 dB
Accuracy: ±0.5 dB
HP 342A
P
VHF Noise Source
Frequency Range: 400 MHz
Excess Noise Ratio: 6.3 dB ±0.5 dB
Noise Generator: Temperature-Limited
Diode
HP 343A
P
VHP Signal Generator
Frequency Range: 600 MHz
Output Level: 40 dBm
HP 612A
P
Double Balanced
Mixer
Frequency Input/Output: “L” “R” ports:
600 MHz, “X” port: 200 MHz ;
Noise Performance: 9 dB max.
HP 10514A
P
Cable Assembly (2)
BNC Male to BNC Male 9” long.
HP 10502A
P
Adapter
BNC to BNC
UG-491/U
P
Adapter
BNC Female to Type N Male
UG-201A/U
P
NOTES
** P * Performance Test; A - Adjustments: T = Troubleshooting
1-3/1-4