HP AR, 460AR Operating And Servicing Manual
HP Archive
This vintage Hewlett Packard document was
preserved and distributed by
www.hparchive.com
Please
visit
us
on the web !
Scanned by on-line curator: Tony Gerbic
** For FREE Distribution Only ***
OPERATING
AND
SERVICING
MANUAL
OPERATING
AND
SERVICING
MANUAL
MODEL
460AR
WIDE
BAND
AMPLIFIER
SERIALS
PREFIXED:
046
-
)
OUTPUT
INPUT
wlOESA• A
"ER
-~
"OO[l
ct/J
..
HI.
r"
..
,......'
..
~
"
t
~
GAIN
POWER
.w
~
•
-+
NORTH
SHORE
LTD.
1074
Cheltenllam
Rd.
Santa
Barbara,
Calif.
93105
)
Copyright
HEWLETT-PACKARD
COMPANY 1956
1501 PAGE MILL ROAD,
PALO
ALTO, CALIFORNlA, U. S. A.
printed
1/61
00019-2
)
FREQUENCY RESPONSE:
GAIN:
SINUSOIDAL OUTPUT:
PULSE OUTPUT:
INPUT IMPEDANCE:
OUTPUT IMPEDANCE:
NOISE FIGURE:
DELAY CHARACTERISTICS:
RISE TIME:
00019-2
SPECIFICATIONS
High FriO!uency-
closely
matches
Gaussian
curve
when
operating
into
a 20
-ohm
resistive
load.
3 db pointis120
me.
Low
Frequency
- off
approximately
3 dbat20 kc when
operating
intoamatched
load. Off
approximately
3dbat3 kc when
operating
intoanopen
circuit
(Le.,
CRT
plates).
With~4lOB VTVM -
whenusedwith~
46A-95DAdapter,
response
± 1 db, 200 kc
to
200
me.
Nominally
20db
into
200 ohm load. Gain
control
has
rangeof6db.
Five
amplifiers
maybecascaded.
Approximately8volts
peak
open
circuit,
less
than5%distortion.
Positive
Pulse
Input:
+8
V open
circuit:
+3.2Vinto
rated
load
Negati ve
Pulse
Input:
-20
V open
circuit:
-8Vinto
rated
load
200
ohms
300
ohms
Less
than 10 db
Approximately
0.014
lisec.
Nominally 0.003Iisec
(10% to
90%
amplitude).
No
appreciable
overshoot.
115/230
volts±10%,
50/1000
cps,SOwatts
)
POWER SUPPLY:
DIMENSIONS:
(Rack
Mount)
lit
~
16
REAR
4---19--_
Ita
)
WEIGHT:
ACCESSORIES AVAILABLE:
Net
12
lbs.
Shipping weight 18
Ibs.
~46A-16A
Patch
Cord;
200
ohms,2feet
long
~ 46A-16B
Patch
Cord;
200
ohms,6feet
long
~
46A-95A
Panel
Jack;
for
200-ohm
cables,
low
capacitance
~
46A-95B
Cable
Plug;
for
200-ohm
systems
~
812-52
Cable;
200
ohm
cable
in length to
specification
~
46A-95C SO-ohm
Adapter;
TypeNto~460,SOohm
termination
~
46A-95D
Adapter;~410B VTVM to~460, no
termination
~
46A-95E
Connector
Sleeve;
Joins
two 46A-95B
Cable
Plugs
~
46A-95F
Adapter;
For
connectingto5XP
CRT
~ 46A-95G
Adapter;
Connect
~ 460 to
Tektronic
511
Oscilloscope
~
46A-95H
Adapter;
Type
N
to
t/iiJ
460, 200
ohm
termination
~
46A-95J
Adapter;
Type
N to~460, no
termination
~
46A-95K
Adapter;
~ 410 VTVM to
~
460, 200 ohm
termination
~
460B-95A
Adapter;
For
connecting
to~
Model 150A
Oscilloscope
plates.
Section
I
CO
TENTS
FOR
MODEL
460AR
WIDE
BAND
AMPLIFIER
GENERAL
DESCRIPTION
1-1
1-2
1-3
General.
• . • • • •
Accessories
Available
230-Volt
Operation
.•
1
1
1
Section
II
OPERATING
INSTRUCTIONS
2-1
2-2
2-3
2-4
2-5
Inspection.
. • • • • •
Controls
and
Terminals.
. • • •
Ins
tallation.
. • • . • • • •
Operation
• • • • • • • • •
Circuit
Description.
•
3
3
3
4
5
Section
III
MAINTENANCE
3-1
Cover
Removal.
3
-2
Tube
Replacements.
•
3-3
Power
Supply
• • • •
3-4
230-Volt
Operation
••••••
3-5
Trouble
Shooting.
• .
3
-6
Replacement
of
200
ohm
Cable
Connector
3-7
Test
Procedure
•••••••••••
7
7
7
7
8
8
9
Section
IV
TABLE
OF
REPLACEABLE
PARTS
. . . .
15
)
)
SECTION
I
GENERAL
DESCRIPTION
1-1
GENERAL
The
<$lModel
460AR
isawide
band
distributed
amplifier
especially
designed
to
amplify
high
speed
pulses
to
high
voltage
levels
with
negligible
overshoot.
In
order
to
retain
the
fast
rise
time
and
shape
of
high
speed
pulses,
it
is
necessary
that
the
amplifier
have
a
wide,
reasonably
flat
frequency
response.
The
frequency
re-
sponse
of
the
~model
460AR
closely
approximates
the
gaussian
response
and
hence
retains
the
characteristics
of
short
fast
pulses.
A
gain
of
20
db
may
be
obtained
with
this
amplifier.
Up
to
five
amp-
lifiers
may
be
cascaded
for
additional
amplification.
The
Model
460AR
is
useful
as
a
general
laboratory
amplifier,
to
increase
voltmeter
and
oscilloscope
sensitivity,
and
in
television
work.
)
1-2
1-3
ACCESSORIES
AVAILABLE
A
complete
line
of
accessories,
for
use
with
the
Model
460AR,
is
available
from
the
Hewlett-Packard
Company.
These
accessories
are
listed
on
the
Specification
page
and
at
the
end
of
the
Table
of
Replaceable
Parts
in
this
manual.
230
VOLT
OPERATION
This
instrument
can
be
easily
converted
for
operation
from
a
230
volt
power
source.
This
conversion
is
covered
in
the
maintenance
section
of
this
manual.
-1-
)
)
)
SECTION
II
OPERA
TING
INSTRUC
TIONS
2-1
INSPECTION
After
the
instrument
is
unpacked,
it
should
be
carefully
inspected
for
damage
received
in
transit.
If
any
shipping
damage
is
found,
follow
the
procedure
outlined
in
the"
Claim
for
Damage
in
Ship-
ment"
page
at
the
back
of
this
instruction
book.
2-2
CONTROLS
AND
TERMINALS
ON
This
toggle
switch
controls
all
the
power
supplied
to
the
instru-
ment
from
the
power
line.
GAIN
This
variable
resistor
controls
the
gain
of
the
amplifier.
FUSE
The
fuseholder,
located
on
the
panel,
contains
the
power
line
fuse.
Replacement
fuses
should
be
of
the
type
specified
in
the
Table
of
Replaceable
Parts.
POWER
CABLE
The
three-conductor
power
cable
supplied
with
this
instrument
is
terminated
inapolarized
three-prong
male
connector.
The
third
contact
is
an
offset,
round
pin
added
toastandard
two-
bladed
a-c
plug
which
grounds
the
instrument
chassis
when
used
with
an
appropriate
receptacle.
An
adapter
may
be
used
to
con-
nect
this
plug
toastandard
two
contact
system.
When
the
adapter
is
used,
the
ground
connection
is
brought
out
onashort
wire.
This
ground
lead
should
then
be
connected
toasuitable
ground
for
the
protection
of
operating
personnel.
INPUT
AND
OUTPUT
The
input
and
output
jacks
on
the
control
panel,
require
special
200-ohm
connectors
and
cables.
2-3
INSTALLATION
No
special
precautions
are
necessary
except,
when
several
460
Amplifiers
are
to
be
used
in
cascade,
they
must
have
a
good
com-
mon
ground,
i.e.:
mounted
inarelay
rack,
and
the
high-voltage
-3-
output
must
be
kept
away
from
the
input
to
avoid
the
possibility
of
feedback.
2-4
OPERATION
The
input
circuit
of
the
Model
460AR
isaterminated
transmission
line
withacharacteristic
impedance
of
200
ohms.
The
output
circuit
has
an
impedance
of
280
ohms
(resistive).
The
load
impedance
determines
the
gain
of
the
amplifier.
Therefore.
it
is
not
neces
sary
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
460AR
using
a
200
ohm
cable.
Connect
acros
s
output
Jack
inside
instrument
200
ohms
load
,-,
4'-----+/-'
.-0--'
-----,
Model
460AR
OUTPUT
~~~----'
-L"""
200
ohm
cable
<
,
, \
•
j
,
,
620
To
any
ohms
load
Model
460AR
OUTPUT
200
ohm
cable
The
GAIN
control
will
vary
the
gain
of
the
amplifier
over
a
range
of
approximately
6
db.
This
control
is
provided
so
that
the
gain
of
the
amplifier
can
be
set
toaknown
value
if
nec-es
sary.
There
is
no
feedback
in
the
amplifier.
so
the
gain
is
directly
proportional
to
the
Gm
of
the
tubes.
The
gain
is
also
determined
by
the
output
load
and
will
vary
with
output
load
in
accordance
with
the
relation
280
X
ZL
280+ZL
The
Wide
Band
Amplifier
can
be
used
with
the
<$Model
410
Vacu-
um
Tube
Voltmeter
to
provide
additional
sensitivity
in
measuring
high
frequencies.
A
special
adaptor
is
available
to
connect
the
probe
of
the
Model
410
to
the
output
terminal
of
the
amplifier.
The
overall
frequency
response
of
the
Model
460AR.
in
combina-
tion
with
the
Model
410.
is
within
1
db
out
to
190
me.
This
combi-
nation
will
give
a
full
scale
meter
reading
on
the
Model
410
with
1/10
volt
applied
to
the
input
of
the
Model
460AR.
-4-
Loading...