HP 460A User manual
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INSTRUCTION
AND
OPERATING
MANUAL
FOR
MODEL
460A
WIDE
BAND
AMPLIFIER
Serial
1996
and
Above
..
HEWLETT-PACKARD
COMPANY
275
PAGE
MILL
ROAD,
PALO
ALTO,
CALIFORNIA,
U.S.A.
#460A004
General
Description
The
Model
460A
Wide
Band
Amplifier
is
designed
to
faithfully
am-
plify
extremely
short
pulses
without
objectionable
ringing
or
over-
shoot.
The
high
frequency
response
matches
the
Gaussian
curve.
A
gain
of
20
db
is
obtained
with
this
amplifier
0
Up
to
five
ampli-
fiers
may
be
cascaded
for
additional
amplification.
The
Model
460A
is
useful
as
a
general
laboratory
amplifier,
to
increase
voltmeter
and
oscilloscope
sensitivity,
and
in
television
work.
Parts
Substitutions
Difficulties
in
procuring
some
of
the
parts
used
in
this
instrument
may
cause
the
electrical
or
physical
values
to
deviate
from
those
shown
in
this
instruction
manual.
These
substitutions
have
been
made
so
as
not
to
impair
the
performance
of
this
instrument
o
Whenever
replacement
of
any
of
these
parts
is
necessary,
either
the
substitute
value
or
the
original
value
may
be
used.
SPECIFICATIONS
FOR
c§j)
MODEL
460A
WIDE
BAND
AMPLIFIER
FREQUENCY
RESPONSE:
GAIN:
OUTPUT:
INPUT
IMPEDANCE:
NOISE
FACTOR:
DELAY
CHARACT
ERISTICS:
RISE
TIME:
POWER
SUPPLY:
SIZE:
WEIGHT:
High
Frequency
-
closely
matches
Gaussian
curve
when
operating
into
a
lOO-ohm
resistive
load.
3
db
point
is
140
mc.
Low
Frequency
-
when
operating
from
a
200-ohm
source
and
O.
1
~f
blocking
condenser.
frequency
response
off
3
db
at
3
kc
into
an
open
circuit
or
succeeding
amplifier.
When
operat-
ing
into
a
200
-ohm
load,
off
3
db
at
100
kc.
With
c§j)410B
VTVM
-
when
used
with
c§j)
46A
-95D
Adapter.
response
i:1
db.
ZOO
KC
to
200
MC.
Approximately
ZO
db
into
ZOO-ohm
load.
Gain
control
has
range
of
6
db.
Five
amplIfiers
may
be
cascaded.
Approx.
8 v
peak
open
circuit.
Output
impedance,
300
ohms.
ZOO
ohms.
Less
than
10
db.
Approx.
.0
14
~
sec.
Approx.
.
00z6
~
sec.
(10%
to
90%
amplitude).
No
appreciable
over-
shoot.
115/Z30
v
±10%.
50/1000
CPSD
35
watts.
19"
relay
rack
panel.
5-1/4"
high;
6-3/4"
deep.
11
pounds.
i
SECTION
I
OPERATING
INSTRUCTIONS
1-1
INSPECTION
This
instrument
has
been
thoroughly
tested
and
inspected
before
being
shipped
and
is
ready
for
use
when
received.
After
the
instrument
is
unpacked
a
it
should
be
carefully
inspected
for
damage
received
in
transit.
If
any
shipping
damage
is
found
a
follow
the
procedure
outlined
in
the
"Claim
for
Damage
in
Ship-
ment"
page
at
the
back
of
this
instruction
book.
1-2
CONTROLS
AND
TERMINALS
ON
This
toggle
switch
controls
all
the
power
supplied
to
the
instru-
ment
from
the
powe
r
line.
Q)
:>
0
.g
"d
s::
cd
-.J:)
0"-
0"-
....
....
cd
....
!-f
1-3
Q)
U)
I.!)
I.!)
-
0"-
-
N
....
-:t'
0
0
<
0
-.J:)
-:t'
GAIN
This
variable
resistor
controls
the
gain
of
the
amplifier.
FUSE
The
fuseholder
contains
a 006
ampere
cartridge
fuseo
The
fuse
may
be
replaced
by
unscrewing
the
fuseholder
cap
and
inserting
a
new
fuseo
Replacement
fuses
for
this
instrument
should
be
of
the
llslow
blow"
type
as
specified
in
the
Replaceable
Parts
Lista
INPUT.
OUTPUT
JACKS
AND
ACC
ESSORIES
The
input
and
output
jacks.
located
on
the
control
panel.
fit
special
connectors
and
cables
which
have
been
designed
for
use
with
Model
460A
because
it
is
not
possible
to
obtain
the
best
performance
with
this
type
of
device
if
standard
commercially
available
connectors
are
used
o
The
accessories
listed
below
are
not
supplied
with
the
instrument.
These
accessories
are
designed
to
solve
special
connection
problems
likely
to
be
encountered
in
the
use
of
the
Model
460A
o
The
acces-
sories
may
be
purchased
from
the
Hewlett-Packard
Companyo
cffp
MODEL
NO
o
46A-16A
DESCRIPTION
Patch
Cord
-
Special
200
ohm
cable
two
feet
in
length.
complete
with
two
No.
46A-
95B
Cable
Plugs.
for
inter-connection
of
two
amplifiers
in
cascade.
-1-
~
MODEL
NO.
46A-16B
DESCRIPT
ON
Patch
Cord
-
Same
as
No.
46A-16A
except
six
feet
in
length.
46A-95A
Panel
Jack
-
Special
low
capacita.nce
panel
jack
designed
for
ZOO
ohm
cable.
Mates
with
Nos.
46A-16A
and
46A-16B
Patch
Cords
or
No.
46A-95B
Cable
Plug.
Requires
1-1/8
inch
diameter
mounting
hole.
46A-95B
Cable
Plug
-
Low
capacitance
plug
de-
signed
for
use
with
ZOO
ohm
cable
o
Mates
with
No.
46A-95A
Panel
Jack
and
with
No.
46A-95E
Connector
Sleeve.
8lZ-5Z
Cable
Special
ZOO
ohm
cable
available
in
lengths
to
meet
customer
req"Girements.
The
input
circuit
of
the
Model
460A
is
a
terminated
transmission
line
with
a
characteristic
impedance
of
ZOO
ohms.
The
output
circuit
has
an
impedance
of
Z80
ohms
(resistive)o
The
load
impedance
determines
the
gain
of
the
amplifiero
Therefore,
it
is
not
necessary
to
match
the
load
to
the
output
of
the
amplifier
unless
the
gain
is
adversely
affected.
Shown
below
are
two
dia-
grams
for
connecting
a
matched
or
unmatched
load
to
the
Model
460A
using
a
ZOO
ohm
cable.
I-'
N
-
-.D
-
11l
11l
Adapter
for
connection
to
5XP
CRTo
50
Ohm
Adaptor
-
Provides
a
cyp~
N
con-
nection
for
coupling
a
50
ohm
transmission
line
to
the
input
of
a
Model
460A
amp_i£ier~
Includes
a
terminating
resistor.
Connector
Sleeve
-
Provides
for
joining
two
No
o
46A-95B
C3.ble
Plugs
in
order
to
interconnect
two
lengths
of
ZOO
ohm
cable
o
Adaptor
for
Model
410A/B
Voltmeter
Probe
-
Consists
of
a
bayonet
type
sleeve
with
which
a
Model
410A/B
Probe
may
be
directly
connected
to
the
output
of
a
Model
460A
Amplifier
o
Includes
the
proper
compensating
LC
components.
46A-95F
46A-95E
46A-95C
46A-95D
OPERATION
1-4
-Z
-
200
ohms
load
-(<e-T-(-~'~--
...
1
Model
460A
OUTPUT
Model
460A
OUTPUT
Connect
across
output
Jack
--
inside
ins
rument
--<~--f(-"+-\
--+~
620
To
any
ohms
load
#812-52
200
ohm
cable
LO
LO
-
0'
-
N
-
The
GAIN
control
will
vary
the
gain
of
the
amplifier
over
a
ange
of
approximately
6
db.
This
control
is
provided
so
that
the
gain
of
the
amplifier
can
be
set
to
a
known
value
if
necessary.
There
is
no
feedback
in
the
amplifier
D
so
the
gain
is
directly
propor-
tional
to
the
Gm
of
the
tubes.
The
gain
is
also
determined
by
he
output
load
and
will
vary
with
output
load
in
accordance
with
th
relation
280
X
ZL
280
+
ZL
The
Wide
Band
Amplifier
can
be
used
with
the
0jJ
Model
410B*
Vacuum
Tube
Voltme
er
to
provide
additional
sensitivity
in
meas-
uring
high
frequencies.
A
special
adaptor
is
a
ailable
to
connect
the
probe
of
the
Model
410B*
to
the
output
terminal
0
the
amplifi
r.
The
overall
frequency
response
of
the
Model
460A.
in
combination
with
the
Model
410B.
is
within
1
db
out
to
190
mc.
This
combI-
nation
will
give
a
full
scale
meter
reading
on
the
Model
410B
with
1/ 10
volt
applied
to
the
input
of
the
Model
460A.
Several
amplifiers
can
be
cascaded
when
more
than
20
db
gain
is
desired.
The
maximum
gain
which
can
be
used
will
be
limited
by
the
effective
noise
generated
in
the
input
circuit
of
the
amplifier.
The
noise
factor
is
approximately
10
db.
The
time
of
rise
of
a
single
unit
is
approximately
2.
6
millimicro-
seconds.
As
units
are
cascaded
D
the
time
of
rise
goes
up
as
the
square
root
of
the
sum
of
the
squares
of
times
of
rise
of
he
individual
stages.
Therefore.
for
two
stages
in
cascadeD
the
time
*
Also
Model
4l0A
-3
-
of
rise
will
be
approximately
3.
7
millimicroseconds
and
for
three
stages,
the
time
of
rise
will
be
approximately
4.4
millimicro-
seconds.
1-5
CIRCUIT
DESCRIPTION
The
Model
460A
is
a
new
type
amplifier
which
has
a
very
wide
transmission
band.
It
has
two
stages
with
five
tubes
in
the
first
stage
and
seven
tubes
in
the
second
stage.
The
grids
of
these
tubes
are
connected
along
one
transmission
line
for
the
input
cir-
cuit
and
the
plates
of
the
tube
s
are
connected
along
a
second
transmission
line
for
the
output
circuit.
A
wave
traveling
down
the
input
line
excites
the
grids
in
succession
and
half
of
the
cor-
responding
wave
generated
in
the
plate
circuit
travels
down
the
plate
line
toward
the
output
and
is
reinforced
at
each
successive
plate.
The
part
of
the
wave
in
th
plate
line
which
travels
in
the
reverse
direction
is
absorbed
by
a
termination
of
the
other
end
of
that
line.
By
the
time
the
wave
in
the
plate
line
reaches
the
out-
put,
it
has
been
amplified
by
about
10
db.
The
second
stage
adds
another
10
db
to
make
a
total
of
20
db
gain
for
the
unit.
The
Model
460A
will
amplify
pulses
with
an
extremely
short
rise
time
and
with
vi
tually
no
overshoot.
The
time
of
rise
of
the
amplifier
itself
is
approximately
2.6
millimicroseconds.
The
amplifier
has
an
amplitude
response
closely
matching
the
Gaussian
Curve,
which
is
the
ideal
transmis
sion
for
pulse
amplifications
when
ringing
or
overshoot
cannot
be
tole=ated.
-4-
1000
MC
100MC
10NC
fllEQUENCY
INC
~
~
",.
..........
-
...
......:
~
.......
'V
~A
~
....
..
'
..
~~
-
~
\
~:\
\
'~
'.\
\\
~\
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,
A=
Amplifier
with
4l0B
Voltmeter
Adapter
\1
I
B •
Amplifier
working
into
200.1\-
Resistance
Load
1\
C=
Gaussian
Curve
-
Optimum
for
Pulse
\
o_
100
KC
2
4
6
8
14
16
18
20
22
~
12
.........
~
10
CQ
~
TYPICAL
RESPONSE
CURVES
MODEL
460A
WIDE
BAND
AMPLIFIER
R2 ALL TUBES
5654
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SCHEMATIC
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MODEL
460A
TRANSFORMER DETAIL
11
11''''
}>OY
II!V
WIDE BAND
AMPLIFIER
SER I
AL
19968
ABOVE
•
TABLE
OF
REPLACEABLE
PARTS
NOTE
Any
changes
in
the
Table
of
Replaceable
Parts
will
be
listed
on
a
Production
Change
sheet
at
the
front
of
this
manual.
When
ordering
parts
from
the
factory
always
include
the
following
information:
Instrument
model
number
Serial
number
-hp-
stock
number
of
part
Description
of
part
Circuit
Ref.
R1,
RIO
TABLE
OF
REPLACEABLE
PARTS
-hp-
Description
Stock
No.
Resistor:
fixed,
composition,
270
ohms
23-270
±10%,
112
W
Electrical
value
adjus
ted
at
factory
Mfr.
*
~
Mfrs.
Designation
B
EB
2711
R2,
R3, R4,
Resistor:
fixed,
composition,
R5,R6,R7
12
ohms,
±10%,
1/2
W
Rll-R18
23-12
B
EB
1201
Cl-C
7,
ClO
Capacitor:
fixed,
ceramic,
C12-C19
001
\-.l
f,
500
vdcw
R8
R9
0
R20
R19
R21
R22
R23
C9abc
C8,
C20
Cll
Sl
T1
L25
F1
11
V1-V12
J1,
J2
Resistor:
fixed,
composition,
195
ohms,
±%. 1
12
W
Resistor:
fixe
do
composition,
5600
ohms,
±lO%,
112
W
Resistor:
fixe
do
composition,
195
ohms,
±1%,
1/2
W
Re
sistor:
fixed,
composition,
33
ohms,
±10%,
1W
Resistor:
variable,
wirewound,
50
ohms,
±10%,
3
W,
linear
taper
Resistor:
fixed,
composition,
10
ohms,
±10%,
1W
Capacitor:
fixed,
electrolytic,
40\-.lf,
l0\-.lf,
l0\-.lf,
150
vdcw
Capacitor:
fixed,
ceramic,
o
0082
\-.l
f,
500
vdcw
Capacitor:
fixed,
ceramic,
•
005
\-.l
f,
min
o,
500
vdcw
Switch,
toggle:
SPST
Transformer:
power
Reactor:
6H
Fuse:
006
Amp,
Slo-Blo
type
Lamp:
6
-8
volt
#47
Tube:
electron,
5654
Jack:
panel
30-195
23-5600
30-195
24-23
210-2
24-10
15-43
18-8
15-46
15-47
310-11
910-133
911-47
211-49
211-47
212-5654
46A-76
Electra
Mfg
oCoo
Type
DC-1/8
B
EB
5621
Electra
Mfg
oCoo
Type
DC-1/8
B
GB
3301
G
21-010-067
B
GB
1001
K
Type
BPD-10
x
K
Type
BPD
K
Type
BPD-5
D,
#81715
HP
HP
T,
#3130600
0,
#47
zz
HP
....
tv
-
-.0
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U1
U1
*See
"List
of
Manufacturers
Code
Letters
For
Replaceable
Parts
Table."
-5-
•
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0'-
-
N
-
TABLE
OF
REPLACEABLE
PARTS
Circuit
-hp-
Mfr.
* •
Mfrs.
Ref.
Description
Stock
No.
Desianation
CR-l
Rectifier:
selenium
212-50
M,
403Dx78A
Knob:
37-11
HP
Power
Cord:
812-56
HP
Fuseholder:
140-16
T,
#342003
*See
"List
of
Manufacturers
Code
Letters
For
Replaceable
Parts
Table.
II
-6-
•
LIST
OF
MANUFACTURERS
CODE
LETTERS
FOR
REPLACEABLE
PARTS
TABLE
Code
Letter
A
B
C
D
E
F
G
H
HP
I
J
K
L
M
N
o
P
R
S
T
V
X
Z
AA
CC
DD
EE
FF
HH
II
KK
LL
MM
ZZ
Manufacturer
Aerovox
Corp.
Allen-Bradley
Co.
Atnperite
Co.
Arrow,
Hart
and
Hegetnan
Busstnan
Manufacturing
Co.
Carborundutn
Co.
Centralab
Cinch
Manufacturing
Co.
Hewlett-Packard
Clarostat
Manufacturing
Co.
Cornell
Dubilier
Electric
Co.
Hi-Q
Division
of
Aerovox
Corp.
Erie
Resistor
Corp.
Federal
Telephone
and
Radio
Corp.
General
Electric
Co.
General
Electric
Supply
Corp.
Girard-Hopkins
International
Resistance
Co.
Lectrohtn,
Inc.
Littelfuse,
Inc.
Micatnold
Radio
Corp.
p.
R.
Mallory
Co.,
Inc.
Sangatno
Electric
Co.
Sarkes
Tarzian
Sprague
Electric
Co.
Stackpole
Carbon
Co.
Sylvania
Electric
Products,
Inc.
Western
Electric
Co.
Atnphenol
Dial
Light
Co.
of
Atnerica
Switchcraft,
Inc.
Gretnar
Mfg.
Co.
Carad
Corp.
Any
tube
having
RETMA
standard
characteristics
90BY013
CLAIM
FOR
DAMAGE
IN
SHIPMENT
The
instrument
should be tested as soon as
it
is received.
If
it fails to operate
properly, or is
damaged
in any way, aclaim should be filed with the
carrier.
Afull
report
of the
damage
should be obtained by
the
claim agent,
and
this
report
should
be forwarded to us. We will then advise you of the disposition
to
be made
of
the
equipment
and
arrange
for
repair
or
replacement. Include model
number
and
serial
number
when
referring
to this
instrument
for any reason.
WARRANTY
Hewlett-Packard Company
warrants
each
instrument
manufactured
by
them
to
be free from defects
in
material
and
workmanship.
Our
liability
under
this
warranty
is limited to servicinG
or
adjusting
allY
instrument
returned
to
the factory
for
that
purpose
and
to replace any defective
parts
thereof. Klystron tubes as well as
other
electron tubes, fuses
and
batteries
are
specifically excluded from any liability.
This
warranty
is effective for one year after delivery to the
original
purchaser
when
the
instrument
is returned,
transportation
charges
prepaid
by the original
purchaser,
and
when upon
our
examination
it
is disclosed to
our
satisfaction to be defective.
If
the fault
has
been caused by misuse
or
abnormal
conditions
of
operation,
repairs
will be billed at cost. In this case,
an
estimate will be submitted before the work is
started.
If
any fault develops, the following steps should be taken:
1. Notify us, giving full details of the difficulty,
and
include the model
number
and serial number. On receipt of this information,
we
will give you service
data
or shipping instructions.
2. On receipt of shipping instructions,
forward
the
instrument
prepaid, to the
factory
or
to the authorized
repair
station indicated on the instructions.
If
requested,
an
estimate of the
charges
will be
made
before the work begins
provided
the
instru-
ment is not covered by the
warranty.
SHIPPING
All shipments of Hewlett-Packard instruments should be
made
via
Truck
or
Railway Express.
The
instruments should be packed
in
a
strong
exterior
container
and
surrounded
by two
or
three inches of excelsior
or
similar shock-absorbing material.
DO
NOT
HESITATE
TO
CALL ON US
HEWLETT-PACKARD
COMPANY
..eab"rat"ry
#""trum.",,,
fur
eJ'/><.,1
a",l.5X!
auracy
275
PAGE
MILL
ROAD
PALO ALTO.CALIF. U.S.A.
CABLE
'I.
"HEWPACK"
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