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United States
Copyright Hewlett-Packard Company 1970-1996. All Rights Reserved. Reproduction, adaptation, or translation
without prior written permission is prohibited, except as allowed under the copyright laws.
1400 Fountaingrove Parkway, Santa Rosa, CA 95403-1799, USA
HP Part No. 08447-90066
Supersedes 08447-90033, 08447-90063, 08447-90059
Printed in USA
Print Date: July 1996
Legal
Legal
The information contained in this document is subject to change without notice.
Hewlett-Packard makes no warranty of any kind with regard to this material, including but not limited to, the implied warranties of merchantability and fitness for
a particular purpose. Hewlett-Packard shall not be liable for errors contained herein
or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.
Safety Info
WARNING:Warning denotes a hazard. It calls attention to a procedure which, if not correctly
performed or adhered to, could result in injury or loss of life. Do not proceed beyond a
warning note until the indicated conditions are fully understood and met.
WARNING:This is a Safety Class I product (provided with a protective earthing ground
incorporated in the power cord). The mains plug shall only be inserted in a socket outlet
provided with a protective earth contact. Any interruption of the protective conductor,
inside or outside the instrument, is likely to make the instrument dangerous. Intentional
interruption is prohibited.
CAUTION:Caution denotes a hazard. It calls attention to a procedure that, if not correctly performed or
adhered to, would result in damage to or destruction of the instrument. Do not proceed beyond
a caution sign until the indicated conditions are fully understood and met.
CAUTION:This product is designed for use in Installation Category II and Pollution Degree 2.
This instrument has been designed and tested in accordance with IEC Publication
348, Safety Requirements for Electronic Measuring Apparatus, and has been supplied in a safe condition. The instruction documentation contains information and
warnings which must be followed by the user to ensure safe operation and to maintain the instrument in a safe condition.
”CSA” The CSA mark is a registered trademark of the Canadian Standards Association.
Notice for Germany: Noise Declaration LpA %< 70 dB am Arbeitsplatz (operator
position) normaler Betrieb (normal position) nach DIN 45635 T. 19 (per ISO 7779)
2DRAFT
Operation and Service Manual
DRAFT3
Operation and Service Manual
General Information
General Information
The HP 8447D, 8447E and 8447F are general purpose, wideband amplifiers. Each
instrument consists of a power supply and one or two thin film, hybrid, integrated
circuit amplifiers. The thin film amplifiers are hermetically sealed and feature low
noise, low distortion, flat frequency response, and long term stability and reliability.
The HP 8447D Amplifier is a pre-amplifier that provides 25 dB of gain to signals
from 100 kHz to 1.3 GHz. It can be used to increase the sensitivity of any lab,
shop or field device operating within its frequency range.
The HP 8447E Amplifier is a power amplifier that provides 22 dB of gain to signals from 100 kHz to 1.3 GHz. It can be used to increase the output power of signal generators, swept sources and similar devices operating within its frequency
range.
The HP 8447F Amplifier contains a preamplifier and a power amplifier. They are
the same thin film amplifiers used in the HP 8447D and HP 8447E. The input and
output ports of both amplifiers are available on the front panel. They can be used
separately or cascaded to provide 47 dB of gain.
The HP 8447F Option H64 Amplifier is a general purpose wide band amplifier
with Type-N connectors. It contains two preamplifiers. One provides 26 dB minimum gain to signals from 9 kHz to 50 MHz. The other provides 25 dB minimum
gain to signals from 100 kHz to 1300 MHz.
Table 1HP 8447D and HP 8447E Specifications
Specifications
Frequency range0.1 to 1300 MHz0.1 to 1300 MHz
Typical 3 dB bandwidth (Std, Opt 001 and Opt 011).075 to 1700 MHz.075 to 1400 MHz
Mean Gain (20° to 30°C)25 dB minimum22 dB ± 2.0dB
Gain flatness across frequency range± 1.5 dB± 1.5 dB
Noise Figure
Output power for 1 dB gain compression
<8.5 dB<11 dB (typical)
>+7 dBm (typical)≥+12.5 dBm
HP 8447D
Preamp
(0.1 to 1000 MHz)
HP 8447E
Power Amp
4DRAFT
Table 1HP 8447D and HP 8447E Specifications
Operation and Service Manual
General Information
Specifications
Harmonic distortion
Typical output for <−60 dB harmonic distortion−30 dBm−20 dBm
VSWR, 1 to 1300 MHz
−30 dB for 0 dBm output (typi-
cal)
<2.0:1 Input
HP 8447D
Preamp
−30 dB for +8 dBm output
−−
HP 8447E
Power Amp
<2.2:1 Output
VSWR, 1 to 1400 MHz
−−<2.2:1 Input
<2.5:1 Output
Impedance50 Ω50 Ω
Reverse isolation
Maximum DC input voltage±10 V±10 V
Typical risetime400 ps420 ps
Typical group delay
Net weight3 lbs 8 oz (1.59 kg)3 lbs 8 oz (1.59 kg)
Option 0013 lbs 14 oz (1.75 kg)
Option 0103 lbs 1 oz (1.84 kg)3 lbs 10 oz (1.64 kg)
>40 dB>40 dB
1.1 ns
a
1.5 ns
−−
b
Option 0114 lbs 10 oz (1.64 kg)
Dimensions8 1/2 in (216 mm) by 5-1/2 in (130 mm) by 3-3/8 in (85.8 mm)
Power Requirements115 or 230 Vac ±10%, 48 to 440 Hz, 15 Watts, 27 VAmax
Environmental
Operation: 0
Storage:
°C to +55°C
−40°C to +75°C
−−
a.Variation over any 50 MHz band from 0.1-1300 MHz is typically <0.15 ns.
b.Variation over any 50 MHz band from 0.1-1300 MHz is typically <0.25 ns.
DRAFT5
Operation and Service Manual
General Information
Table 2HP 8447F Specifications
Specifications
Frequency range0.1 to 1300 MHz0.1 to 1300 MHz0.1 to 1300 MHz9 kHz to 50 MHz
Typical 3 dB bandwidth
(Std, Opt 001 and Opt 011)
Mean Gain (20° to 30°C)25 dB minimum22 dB ± 2.0dB25 dB minimum26 dB minimum
Gain flatness across frequency range
Noise Figure
Output power for 1 dB gain
compression
Harmonic distortion
Typical output for <−60 dB
harmonic distortion
VSWR, 9 kHz to 50 MHz
VSWR, 1 to 1300 MHz
PreampPower Amp
.075 to 1700 MHz.075 to 1400 MHz.075 to 1700 MHz6 kHz to 400 MHz
± 1.5 dB± 1.5 dB± 1.5 dB± 2 dB
<8.5 dB<11 dB (typical)<8.5 dB−−
>+7 dBm (typical)≥+12.5 dBm
−30 dB for 0 dBm
output (typical)
−30 dBm−20 dBm−30 dBm−2 dBm
−−−−−−<2.0:1
<2.0:1 Input
<2.2:1 Output
HP 8447F
(0.1 to 1000 MHz)
−30 dB for +8 dBm
output
−−<2.0:1 Input
PreampLow Freq. Preamp
>+7 dBm (typical)>+15 dBm
−30 dB for 0 dBm
output (typical)
<2.2:1 Output
HP 8447F H64
(0.1 to 1000 MHz)
−35 dBc for +10
dBm output
VSWR, 1 to 1400 MHz
−−<2.2:1 Input
−−
<2.5:1 Output
Impedance50 Ω50 Ω50 Ω50 Ω
Reverse isolation
Maximum DC input voltage
Typical risetime400 ps420 ps400 ps
Typical group delay
Net weight3 lbs 14 oz (1.75 kg)3 lbs 14 oz (1.75 kg)
Option 001
>40 dB>40 dB>40 dB−−
±10 V±10 V±10 V±10 V
−−
1.1 ns
a
1.5 ns
b
1.1 ns
a
−−
−−−−
6DRAFT
Table 2HP 8447F Specifications
Operation and Service Manual
General Information
Specifications
Option 0104 lbs 1 oz (1.84 kg)4 lbs 1 oz (1.84 kg)
Dimensions8 1/2 in (216 mm) by 5-1/2 in (130 mm) by 3-3/8 in (85.8 mm)
Power Requirements115 or 230 Vac ±10%, 48 to 440 Hz, 15 Watts, 27 VAmax
Environmental
PreampPower Amp
Operation: 0
Storage:
−40°C to +75°C
HP 8447F
PreampLow Freq. Preamp
°C to +55°C
a.Variation over any 50 MHz band from 0.1-1300 MHz is typically <0.15 ns.
b.Variation over any 50 MHz band from 0.1-1300 MHz is typically <0.25 ns.
Table 3HP 8447F H64 Characteristics
Characteristics
Noise figure
9 kHz to 20 kHz
20 kHz to 100 kHz
100 kHz to 50 MHz
Typical mean gain (20° to 30°C)
PreampLow Freq. Preamp
−−
−−
HP 8447F H64
<12.0 dB
<9.0 dB
<7.0 dB
28 dB
HP 8447F H64
DRAFT7
Operation and Service Manual
General Information
Figure 1 Typical Preamplifier Performance Curves
8DRAFT
Operation and Service Manual
General Information
Figure 2 Typical Power Amplifier Performance Curves
DRAFT9
Operation and Service Manual
General Information
Options
The HP 8447D is a single preamplifier with BNC connectors. However, to provide flexibility, three options are offered:
aOption 001 dual preamplifier, BNC connectors.
b Option 010 single preamplifier, Type-N connectors.
cOption 011 dual preamplifier, Type-N connectors.
The HP 8447E is a power amplifier with BNC connectors. One option is offered:
Option 010, Type-N connectors.
The HP 8447F is a preamplifier and a power amplifier with BNC connectors. One
option is offered:
Option 010, Type-N connectors.
Option H64, Two preamplifiers with Type-N connectors. This option is not offered in
conjunction with any other options.
NOTE:Dual amplifier option 010 is furnished with a rigid coaxial cable (W6), with
Type-N connectors, that can be used to cascade the amplifiers with minimum
loss. The option H64 dual amplifier is not supplied with this cable.
Instruments Covered by this Manual
This manual fully documents the HP 8447D, HP 8447E and the HP 8447F. Any
references in the manual apply to all three amplifiers unless otherwise noted.
Each amplifier has a ten digit serial number on the serial plate on the rear panel.
The first five digits of the serial number are a prefix. The contents of this manual
apply directly to instruments with the same serial number prefix as listed on the
inside title page.
Revisions required to adapt the manual to other serial number prefixes are contained in a yellow “Manual Changes” insert supplied with the manual. For information about serial number prefixes not listed on the title page or in the insert,
contact your nearest Hewlett-Packard office.
10DRAFT
Operation and Service Manual
General Information
DRAFT11
Operation and Service Manual
Receiving and Operating
Receiving and Operating
Initial Inspection
Mechanical Check
If damage to the shipping carton is evident, ask the carrier’s agent to be present
when the instrument is unpacked. Inspect the instrument for mechanical damage.
Also check the cushioning material for signs of severe stress.
Performance Check
The electrical performance of an amplifier should be verified upon receipt. Performance checks suitable for incoming inspections are given in the performance test
section.
Claims for Damage
If the instrument is mechanically damaged in transit, notify the carrier and the
nearest Hewlett-Packard field office immediately. A list of field offices is contained in the back of this manual. Retain the shipping carton and padding material
for the carrier’s inspection. The field office will arrange for replacement or repair
of your instrument without delay for claim settlements against the carrier. Before
shipment, this instrument was inspected and found free of mechanical and electrical defects. If there is any deficiency, or if electrical performance is not within
specifications, notify your nearest Hewlett-Packard sales and service office.
Preparation For Use
Power Requirements
The amplifier operates from 115 or 230 volt ac line voltages, at any line frequency
between 48 and 440 Hz. A slide switch on the rear panel is set to the correct position for the line voltage available.
Power Cable
To protect operating personnel, the National Electrical Manufacturer’s Association (NEMA) recommends that the instrument panel and cabinet be grounded. All
Hewlett-Packard instruments are equipped with a three-conductor power cable
which, when plugged into the appropriate receptacle, grounds the instrument. The
12DRAFT
Operation and Service Manual
Receiving and Operating
offset pin on the power cable’s three-prong connector is the ground wire. The
power cord and power input connector meet the specifications established by the
International Electrotechnical Commission (IEC).
CAUTION:Always use the three-prong ac power cord supplied with this instrument. Failure to ensure
adequate earth grounding by not using this cord may cause instrument damage.
Mating Connectors
Mating connectors used with the amplifier should be 50 Ω type BNC male. If the
amplifier has the optional Type-N connectors, use Type-N male connectors that
are compatible with US MIL-C-39012.
Operating Environment
The operating range of the amplifier is from 0°C to +55°C. The amplifier can be
stored in a temperature range of
−40°C to +75°C.
Bench Use
The amplifier is equipped with plastic feet and tilt stand in place, ready for use as
a bench instrument.
WARNING:If this product is not used as specified, the protection provided by the equipment could
be impaired. This product must be used in a normal condition only (in which all means
for protection are intact).
Rack Mounting
The amplifier may be rack mounted by using an adapter frame. The adapter frame
is a rack frame that accepts several combinations of sub-modular units. For additional information, address inquiries to your nearest Hewlett-Packard sales and
service office.
Storage and Shipment
Packaging
The following paragraphs contain a general guide to repackaging of the instrument for shipment. Refer to them for information about using the original packaging, or using other packaging.
DRAFT13
Operation and Service Manual
Receiving and Operating
If the instrument is to be shipped to Hewlett-Packard for service or repairs, attach
a tag to the instrument identifying the owner and indicating the service or repair
required. Include the model number and full serial number of the instrument.
Original Packaging
If the original container is to be used, proceed as follows:
aPlace instrument in original container. If it is not available, a suitable container can be
purchased from your nearest Hewlett-Packard sales and service office.
b Be sure the container is well sealed with strong tape or a metal band.
Other Packing Material
If the original container is not used, proceed as follows:
aWrap the instrument in heavy paper or anti-static plastic before placing in inner anti-
static container.
b Place packing material around all sides of the instrument and protect panel face with
cardboard strips.
cPlace instrument in a heavy carton and seal with strong tape. A double-wall carton
made of 200 pound test material is adequate.
d Mark shipping container; “Delicate Instrument. Fragile.”
Operating Instructions
Connect the line power cable to the three-prong rear panel socket and proceed as
follows:
aSelect the line power to be used (115V or 230V) with the rear panel SELECTOR
switch.
b Connect the line power cable to line power and press the LINE switch.
CAUTION:The input to the HP 8447D/E/F and the HP 8447F Option H64 amplifiers 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.
Do not apply power levels to the amplifier that are higher than the following:
HP 8447D: 0 dBm
HP 8447E: −10 dBm
HP 8447F preamp: 0 dBm
HP 8447F power amp: +10 dBm
14DRAFT
Operation and Service Manual
Receiving and Operating
cAttach INPUT and OUTPUT cables.
CAUTIONPower out of the HP 8447E and power out of the HP 8447F power amp can
exceed 100 mW. This may be enough power to damage sensitive circuits
connected to the OUTPUT.
Operator Maintenance
Operator maintenance is limited to replacement of the front panel LINE switch
light, the A1 power supply fuse, and the rear panel fuse. Clean the cabinet using a
damp cloth only.
Fuses
To replace the rear panel fuse (F1), remove the rear panel fuse knob and replace
the fuse (see rear panel for value of F1).
To replace the A1 power supply (A1F1) fuse, turn the instrument on its top. Lift
the tilt stand and remove the bottom cover. Replace the fuse on the A1 Power
Supply board (see parts list for the value of A1F1).
WARNING:For continued protection against fire hazard replace line fuse only with same type and
rating ([0.5A/250V]). The use of other fuses or material is prohibited.
Lamp Replacement
To replace the front panel line switch lamp (DS1), proceed as follows:
aDisconnect cord from rear panel receptacle.
b Pull the white cover portion of this switch from the instrument and then remove the
lamp from inside the cover.
cReplace old lamp with a new lamp (see parts list for part number of DS1).
d Place white cover into switch receptacle.
eAlign tab on white cover with socket and push in.
WARNING:No operator serviceable parts inside. Refer servicing to qualified personnel. To prevent
electrical shock, do not remove covers.
DRAFT15
Operation and Service Manual
Performance Tests Procedures
Performance Tests Procedures
Test equipment and accessories required to perform maintenance are listed in
Table 4. Equipment other than recommended models can be used provided the
minimum specifications are satisfied.
The performance tests assume the use of a standard amplifier with BNC connectors. If an amplifier with Type-N connectors is to be tested, suitable adapters will
have to be added to the equipment lists.
The performance tests and adjustment procedure cover all three amplifiers. Where
required, test steps list equipment settings, and other additional information, for
each amplifier. If a test step lists only one setting or specification, it is valid for all
three amplifiers. Disregard references to any amplifier not being tested.
Table 4Recommended Test Equipment and Accessories
Instrument TypeMinimum SpecificationsSuggested Model
Generator/Sweeper
Generator/Sweeper
Sweep Oscillator
Frequency Range: 0.1 to 110 MHz
Flatness:
Output Level:
Frequency Accuracy: 1%
Compatible with network analyzer
Frequency Range: 9 kHz to 50MHz
Flatness:
Output Level:
Frequency Accuracy: 1%
Compatible with network analyzer
Frequency Range: 0.1 to 1.3 GHz
Flatness: 0.7 dB over full range
Output Level:
Frequency Accuracy:
Compatible with network analyzer
±0.25 dB over full range
+10 dBm minimum
±100 kHz
±0.25 dB over full range
+10 dBm minimum
±100 kHz
+10 dBm minimum
±20 MHz
HP 8601AP,T
HP 3335AP,T
HP 8620A/8621AP,T
a
Use
(for testing
opt H64)
16DRAFT
Table 4Recommended Test Equipment and Accessories
Operation and Service Manual
Performance Tests Procedures
Instrument TypeMinimum SpecificationsSuggested Model
Network analyzer
(0.1-110 MHz)
Network analyzer
(0.11 -1.4 GHz)
Phase-magnitude
display
Harmonic fre-
System with a swept source capable of measuring the amplitude of reflected signals return loss.
Frequency range: 0.1 to 1300 MHz
Resolution: 0.25 dB
Accuracy: ±6%
Gain Flatness, Mean Gain, and Gain Compression Test
Specifications:
Gain flatness across
full frequency
range
Mean Gain
(20°C-30°C)
Output power for 1
dB gain compression
HP 8447D
Preamp
±1.5 dB±1.5 dB±1.5 dB±1.5 dB±1.5 dB±2 dB
25 dB min.22 dB ±2.0dB25 dB min.22 dB ±2.0dB25 dB min.26 dB min.
−−>+12.5 dBm−−>+12.5 dBm−−>+15 dBm
Description:
HP 8447E
Power amp
HP 8447F
PreampPower
Amp
HP 8447F H64
Preamp Low Freq
Preamp
Amplifier gain is measured at the maximum and minimum points of its frequency
response. See Figure 1 and Figure 2. The difference between highest measured
gain and lowest measured gain should be less than 3 dB (gain flatness). Half of the
sum of the highest gain and lowest gain is the measured mean gain and should be
within 2.0 dB of the specified gain. Compression is checked by measuring gain at
the specified 1 dB compression point and comparing it to gain measured below
compression.
1To measure gain flatness and mean gain, connect the equipment as shown in Figure 3.
Set the sweep oscillator for a 1.3 GHz, leveled, CW signal. Set the signal level for −10
dBm out of the 10 dB attenuator (read on the power meter).
2Disconnect the power meter from the sweep oscillator and 10 dB attenuator. Connect
the sweep oscillator, through the 10 dB and 20 dB attenuators, to the amplifier
INPUT. Connect the power meter to the amplifier OUTPUT. Note the power meter
reading. Use this reading to calculate amplifier gain.
Example:
−7 dBm (read in step 2) minus −10 dBm (set in step 1) plus 20 dB (read from attenuator) = 23 dB (gain)
Gain at 1300 MHz:______________________dB
NOTE:Use the attenuation printed on the 20 dB attenuator. This may vary slightly, depending
upon the frequency.
3Tune the sweep oscillator for a maximum indication on the power meter at 1150 ±100
MHz. Disconnect the oscillator and the power meter from the amplifier. Connect the
power meter, through the 10 dB attenuator, to the oscillator. Set the oscillator signal
level for −10 dBm out of the attenuator.
4Disconnect the power meter from the sweep oscillator and 10 dB attenuator. Connect
the oscillator, through the 10 dB and 20 dB attenuators, to the amplifier INPUT. Con-
20DRAFT
Operation and Service Manual
Performance Tests Procedures
nect the power meter to the amplifier OUTPUT. Calculate and record the amplifier gain
as in step 2.
Gain at 1150 MHz________________________dB
5Measure, calculate and record the amplifier gain at the following frequencies. Use the
procedures outlined in steps 3 and 4.
FrequencyGain
800 ±200 MHz (tune for minimum):_______________dB
350 ±100 MHz (tune for minimum):_______________dB
6Disconnect the sweep oscillator and the power meter from the amplifier. Connect the
equipment as shown in Figure 4. Set the generator/sweeper for a 10 MHz, CW signal.
Set the signal level for −40 dB (read on the voltmeter).
7Disconnect the voltmeter from the generator/sweeper. Connect the generator/sweeper
to the amplifier INPUT. Connect the voltmeter, with the 50 Ω termination, to the amplifier OUTPUT. Note the voltmeter reading. Use this reading to calculate the amplifier
gain.
Example:
−18.5 dB (read in step 7) minus −40 dB (set in step 6) = 21.5 dB (gain)
Gain at 1300 MHz:______________________dB
Figure 4 Flatness and Mean Gain Test Setup: 100 kHz to 10 MHz
8Measure, calculate and record amplifier gain at the following frequencies. Use the pro-
DRAFT21
cedures outlined above.
Operation and Service Manual
Performance Tests Procedures
FrequencyGain
250 ±100 kHz (tune for maximum):_______________dB
100 kHz:_______________dB
For HP 8447F H64 low frequency preamp, replace the generator/sweeper shown in
Figure 4 with HP 3335A synthesizer (or equivalent). Set the synthesizer for a 9 kHz,
CW signal. Repeat step 7. Measure, calculate and record the amplifier gain at 9 kHz.
HP 8447F H64 FrequencyGain
9 kHz:_______________dB
9Select the highest and lowest gains from steps 2, 4, 5, 7, and 8. Subtract the lowest gain
from the highest gain. The result is gain flatness and should be less than 3 dB.
Example:
23 dB (highest gain) minus 21.5 dB (lowest gain) = 1.5 dB (gain flatness)
Gain flatness:__________________dB
For HP 8447F H64 low frequency preamp, select the highest and lowest gains from
steps 7, and 8. Subtract the lowest gain from the highest gain. The result is gain flatness and should be less than 4 dB (±2 dB). Add the highest and lowest gains together
and divide by 2. The result is measured gain.
Measured gain:__________________dB
10 Add the highest and lowest gains together and divide by 2. The result is the measured
mean gain.
Example:
23 dB (highest gain)21.5 dB (lowest gain)+
------------------------------------------------------------------------------------------------------------22.25 dB (mean gain)=
2
22DRAFT
Operation and Service Manual
Performance Tests Procedures
Mean GainMinActualMax
HP 8447D25 dB________
HP 8447E20 dB________24 dB
HP 8447F preamp25 dB________
HP 8447F power amp20 dB________24 dB
NOTE:Gain rolls off rapidly above 1300 MHz and below 0.1 MHz. If the lowest gain was
measured at either of these points, use a frequency counter to monitor the signal and repeat
steps 1 through 10.
11 To check compression, connect the power meter mount, through the 10 dB attenuator,
to the amplifier OUTPUT as shown in Figure 3. Connect the sweep oscillator, through
the 20 dB attenuator, to the amplifier INPUT. Set the sweep oscillator for a leveled, 650
MHz, CW signal and set the signal level (read on the power meter) as follows:
(For the HP 8447F H64 low frequency preamp set the 3335A to 10 MHz)
HP 8447E:
HP 8447F power amp:
+2.5 dBm (+11.5 dBm ampl. output)
+2.5 dBm (+11.5 dBm ampl. output)
12 Without changing any of the sweep oscillator settings, move the 10 dB attenuator from
the amplifier OUTPUT to the amplifier INPUT. The power meter should now be connected directly to the amplifier OUTPUT and the sweep oscillator should be connected
through the 20 dB attenuator and the 10 dB attenuator to the amplifier
INPUT.
13 The power meter should read as follows:
HP 8447E
HP 8447F power amp
HP 8447F H64 low fre-
less than +3.5 dBm:
less than +3.5 dBm:
less than +6 dBm:
_____________dBm
_____________dBm
_____________dBm
quency preamp
14 Repeat steps 11 through 13 at various frequencies between 0.1 and 1300 MHz.
For the HP 8447F H64 low frequency preamp repeat steps 11 through 13 at various
frequencies between 0.1 to 50 MHz.
A network analyzer is swept, in steps, from 1 to 1300 MHz (or 1400 MHz). At
each step the analyzer display is referenced to 1 dB return loss by shorting its output. The short is then removed and the amplifier return loss is measured at the
INPUT and OUTPUT.
1Connect the equipment as shown in Figure 5. Set the generator/sweeper for a −10 dBm
signal, sweeping from 1 to 110 MHz.
2Connect the short to the directional bridge and calibrate the network analyzer for a 0 dB
return loss reference on the display (use the center horizontal graticule line).
3Remove the short from the directional coupler, attach the coupler to the amplifier IN-
PUT. (Terminate the OUTPUT with 50 Ω.)
4Decrease the display reference level to −10 dB. The center horizontal graticule line now
represents a return loss of 10 dB. The measured return loss should be as shown below:
INPUT VSWR, 1 to 110 MHz
HP 8447D, >9.6 dB:___________HP 8447F Preamp, >9.6 dB:_____________
HP 8447E, >8.8 dB:___________HP 8447F Power amp, >8.8 dB:__________
HP 8447F Option H64 Low frequency preamp, 1 to 50 MHz>9.6 dB:__________
5Measure return loss at the amplifier OUTPUT. Terminate the INPUT with 50Ω. The
measured return loss should be as shown below.
For the HP 8447F option H64 low frequency preamp, steps 7 through 11 are not
needed.
DRAFT25
Operation and Service Manual
Performance Tests Procedures
HP 8447D Output VSWR, 1 to 110 MHz:>8.8 dB_____________
HP 8447E/F Output VSWR, 1 to 110 MHz:>7.7 dB_____________
HP 8447F Option H64 low frequency preamp
Output VSWR, 1 to 50 MHz:
>9.6 dB_____________
Figure 6 VSWR Test Setup: 0.11 to 1.3 GHz
6Connect the equipment as shown in Figure 6. Set the sweep oscillator for a leveled CW
signal, sweeping from 110 to 220 MHz. Connect the power meter to the s-parameter
test set INPUT PORT A and set the generator/sweeper output level for −15 dBm as read
on the power meter.
26DRAFT
Operation and Service Manual
Performance Tests Procedures
7Disconnect the power meter from the test set and connect a short to INPUT PORT A
(measuring S11 at INPUT PORT A). Calibrate the network analyzer for a 0 dB return
loss reference on the display. Use the center horizontal graticule line. Note the TEST
CHANNEL GAIN at the reference:
Reference TEST CHAN. GAIN, 110 to 220 MHz:___________dB
8Disconnect the short from INPUT PORT A. Terminate the amplifier OUTPUT with 50
Ω. Connect INPUT PORT A to the amplifier INPUT.
9Set the TEST CHANNEL GAIN 10 dB above the reference in step 7. The center hori-
zontal graticule line now represents a return loss of 10 dB. The measured return loss
should be as shown below:
INPUT VSWR, 110 to 220 MHz
HP 8447D, >9.6 dB:__________HP 8447F Preamp, >9.6 dB:_____________
HP 8447E, >8.8 dB:__________HP 8447F Power amp, >8.8 dB:__________
10 Repeat steps 8 and 9, measuring return loss at the amplifier OUTPUT. Terminate the
amplifier INPUT with 50Ω. The measured return loss should be as shown below:
HP 8447D Output VSWR, 110 to 220 MHz:8.8 dB_____________
HP 8447E/F Output VSWR, 110 to 220 MHz:7.7 dB_____________
11 Set the sweep oscillator to sweep each of the ranges shown below, repeating steps 7
through 10 for each range.
Reference,
Sweep Range
220 to 440 MHz_________dB__________dB___________dB__________dB
440 to 880 MHz_________dB__________dB___________dB__________dB
880 to 1300 MHz_________dB__________dB___________dB__________dB
Test Chan.
Gain
HP 8447D Input,
HP 8447F Preamp
Input
HP 8447D Output,
HP 8447E Input,
HP 8447F Power
Amp Input
HP 8447E/F
Output
DRAFT27
Operation and Service Manual
Performance Tests Procedures
Distortion and Reverse Isolation Test Procedure
Specifications:
Specification
Harmonic
Distortion
Reverse
Isolation
HP 8447D
Preamp
−−
>40 dB>40 dB>40 dB>40 dB>40 dB−−
Description:
HP 8447E
Power Amp
−30 dB for
+8 dBm out-
put
HP 8447F
PreampPower Amp
−−
−30 dB for
+8 dBm out-
put
HP 8447F H64
PreampLow Freq
Preamp
−−
−35 dB for
+10 dBm out-
put
A fixed, CW signal at 400 MHz is filtered and applied to the amplifier INPUT.
The amplifier OUTPUT is connected to a spectrum analyzer, and the analyzer is
used to check the second and third harmonic levels. Reverse isolation is checked
by applying a known signal level to the amplifier OUTPUT and measuring it at
the amplifier INPUT.
Figure 7 Distortion and Reverse Isolation Test Setup
Procedure:
1To check distortion, connect the equipment as shown in Figure 7. Set the sweep oscil-
lator for a fixed, 400 MHz CW signal.
For the HP 8447F option H64 low frequency preamp, set the frequency to 10 MHz.
2Set the spectrum analyzer input attenuator as shown below. Adjust the controls to dis-
play 400 through 1200 MHz.
For the HP 8447F option H64 low frequency preamp, set the controls to display 10
through 30 MHz.
NOTE:The signal into the spectrum analyzer input mixer must be low enough to eliminate
harmonic distortion in the spectrum analyzer.
3Set the sweep oscillator output level for the following signal levels out of the amplifier
(read on the spectrum analyzer).
Spectrum Analyzer
Input Attenuation
50 dB
50 dB
HP 8447E:
HP 8447F Power Amp:
Signal Level
+8 dBm
+8 dBm
HP 8447F H64 Low freq preamp:
4Note the level of the second harmonic at 800 MHz and the third harmonic at 1200 MHz.
DRAFT29
+10 dBm
50 dB
Operation and Service Manual
Performance Tests Procedures
The harmonic signal levels should be >30 dB below the fundamental.
For the HP 8447F option H64 low frequency preamp, note the level of the second harmonic at 20 MHz and the third harmonic at 30 MHz. The harmonic signal levels
should be >35 dB below the fundamental.
Harmonic Distortion, 30 dB down:_____________
HP 8447F H64Harmonic Distortion, 35 dB down:_____________
5To check reverse isolation, disconnect the oscillator and the spectrum analyzer from the
amplifier, reduce the oscillator’s output level, then connect the oscillator to the spectrum analyzer.
6Set the oscillator output level for a 0 dBm signal as read on the spectrum analyzer. Con-
nect the spectrum analyzer to the amplifier INPUT. Connect the oscillator to the amplifier OUTPUT.
7Read the level of feed-through directly on the spectrum analyzer. It should be below −
40 dBm:
Reverse isolation, >40 dB down:________________
Noise Figure Test Procedure
Specifications:
Noise Figure: <8.5 dB (for the HP 8447D and HP 8447F preamp)
Characteristics
Noise Figure: <7.0 dB (for the HP 8447F option H64 low frequency preamp)
Description:
Noise figure is checked at 100 MHz by inserting a known amount of excess noise
into the amplifier under test. The known noise is then compared to the amplifier’s
noise level with a noise figure meter. Noise is checked at 200 MHz using a
1300MHz signal source and a mixer to convert the noise to 100 MHz. Then it is
measured with the meter.
Figure 10 Power Supply Voltage Adjustment Test Setup
Procedure:
1Connect the test setup in Figure 10. Set the digital voltmeter to measure +20V dc.
2Adjust A1R9 VOLT ADJ for a digital voltmeter reading of +20V ±0.1V dc.
3Remove the digital voltmeter from the amplifier and connect the RMS voltmeter to
DRAFT33
DVM: +19.9V dc_________________+20.1V dc
XA1 pin 14. The ripple voltage should be as shown below.
Operation and Service Manual
Parts and Service
Parts and Service
Replaceable Parts
The following tables list parts in alpha-numerical order of their reference designations. It is important that you refer to the table that documents the instrument
being serviced. Cabinet parts for all three amplifiers are listed in Figure 11. HP
8447D/E/F Cabinet Parts. Figure 12. HP 8447D/E/F Type-N Connector (Options
010 and 011) lists the parts that make up the Type-N connector used in amplifier
Options 010 and 100.
Ordering Information
To obtain replacement parts, address order or inquiry to your local Hewlett-Packard field office. See the list at the end of the manual for addresses. Identify parts
by their Hewlett-Packard part numbers.
To obtain a part that is not listed, include:
aInstrument model number
b Instrument serial number
cDescription of the part
d Function and location of the part
Table 5Reference Designators
A
B
BT
C
CP
CR
DL
DS
E
F
FL
J
= assembly
= motor
= battery
= capacitor
= coupler
= diode
= delay line
= lamp, device signal
= misc. electronic part
= fuse
= filter
= jack
XF1MP12110-056481
XF1MP22110-056591Fuseholder cap 12A max for UL284802110-0565
XF1MP32110-056931Nut-fuseholder thread284802110-0569
XQ10340-11141Insulator: xstr mounting (TO-3)284800340-1114
MP108447-0000561Insulator: top cover2848008447-00005
Q11854-006371Xstr: si NPN801312N3055
R10683-273501R: fixd comp 27 kohm 5% 1/4W01121CB 2735
HP Part
Number
CDqtyDescription
(part of rear panel)
(Opt 001 and 011 only)
Mfr
Code
82389EAC-301
284809100-1618
Mfr Part
Number
S13101-213991Switch-pb DPST-NO altng 10.5A 250Vac284803101-2139
S13101-21951for HP 8447D, serial no. 2727A06246
for HP 8447E, serial no. 2727A02669
for HP 8447F, serial no. 2805A03498
S10590-001252Nut: knurled 15/32-3204009899U-3
S23101-123431Switch: slide DPDT8238911A-1242
T19100-289471Transformer: power284809100-2894
U15086-776871Hybrid mc:power-ampl 0.1-1300 MHz284805086-7767
U108447-600295086-7768 replacement kit (for use with
(Opt 010 and 011 only)
W308447-2000701Cable assy: BNC OUTPUT2848008447-20007
284803101-2195
2848008447-60029
2848008447-20002
2848008447-20003
DRAFT41
Operation and Service Manual
Parts and Service
Table 9HP 8447E Replaceable Parts
Ref
Des
XF1Fuseholder (includes the following parts)
XF1MP12110-056481
XF1MP22110-056591Fuseholder cap 12A max for UL284802110-0565
XF1MP32110-056931Nut-fuseholder thread284802110-0569
XQ10340-06641Insulator: xstr mounting (TO-3)284800340-0664
XF1MP41400-009091Washer: lock sst for 1/2 thread284801400-0090
XF1MP12110-056481
XF1MP22110-056591Fuseholder cap 12A max for UL284802110-0565
XF1MP32110-056931Nut-fuseholder thread284802110-0569
XQ10340-06641Insulator: xstr mounting (TO-3)284800340-0664
XF1MP41400-009091Washer: lock sst for 1/2 thread284801400-0090
XF1MP12110-056481
XF1MP22110-056591Fuseholder cap 12A max for UL284802110-0565
XF1MP32110-056931Nut-fuseholder thread284802110-0569
XF1MP41400-009091Washer: lock sst for 1/2 thread284801400-0090
08447-000409Panel, front (8447D standard) mint gray1
08447-000410Panel, front (8447D Opt 001) mint gray1
08447-000421Panel, front (8447D Opt 010) mint gray1
08447-000432Panel, front (8447D Opt 011) mint gray1
08447-000443Panel, front (8447E standard) mint gray1
08447-000454Panel, front (8447E Opt 010) mint gray1
08447-000465Panel, front (8447F standard) mint gray1
08447-000476Panel, front (8447F Opt 010) mint gray1
50DRAFT
Operation and Service Manual
Parts and Service
Figure 12 HP 8447D/E/F Type-N Connector (Options 010 and 011)
Index
No.
11250-09147Body, RF conn55040-03060Insulator
21250-09158Contact, RF conn608555-200945Contact, jack
32190-04441Washer, lock708555-200946Body bulkhead
42950-01326Nut, hex808761-20274Insulator
08559-60002Complete assembly
Part No.CDDescription
DRAFT51
Index
No.
Part No.CDDescription
Operation and Service Manual
Parts and Service
Figure 13 Internal Views
52DRAFT
Operation and Service Manual
Parts and Service
Test Equipment and Accessories Required For Troubleshooting
Test equipment and accessories required to troubleshoot the amplifier are shown
in Table 4. Test instruments other than those listed may be used provided their
specifications meet or exceed those listed in the table.
General Service Information
The part reference designator is the assembly designator plus the part designator.
(Example: A1R9 is R9 on the A1 Power Supply Assembly.) Refer to the parts list
of the desired model number for the specific component description for ordering
parts.
Additional technical assistance may be obtained by contacting your local HewlettPackard sales and service office. Some of these offices are listed in Table 13.
WARNING:These servicing instructions are for use by qualified personnel only. To avoid electrical
shock, do not perform any servicing unless you are qualified to do so.
WARNING:The opening of covers or removal of parts is likely to expose dangerous voltages.
Disconnect the instrument from all voltage sources while it is being opened.
WARNING:The power cord is connected to internal capacitors that may remain live for 10 seconds
after disconnecting the plug from its power supply.
Troubleshooting Procedure
First check the input and output cables. Isolate the trouble to the amplifier(s) or
power supply by checking the
+20 volts at XA1-14 after removing the red wire
from C2. If the voltage is present, replace the amplifier (re-attach the red wire to
C2). If voltage is not present or incorrect, check the power supply. The voltages
shown are typical with the amplifier(s) disconnected from the power supply.
Figure 17 A2 Amplifier Board Schematic (replaces U2 on Figure 18)
DRAFT55
Operation and Service Manual
Parts and Service
Figure 18 Amplifier and Power Supply Circuits
56DRAFT
Manual Backdating Changes
This manual does not contain backdating information.
When backdating information is required you would adapt this manual to your
instrument by making all of the manual changes listed opposite your instrument
serial number in the following table. Perform these changes in the alphabetical
sequence listed.
For additional important information about serial number coverage, refer to
Instruments Covered By Manual.
Table 12Manual Changes By Serial Number Prefix
Serial PrefixMake Manual Changes
Operation and Service Manual
Manual Backdating Changes
DRAFT57
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