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ModeIs 461A/462A
+IDB
O
DB
_IDB
i
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t
I
t
I
Fi$re 5-9.
Frequency Response
Calibration of -hp-
461A, Markers at 25, 50, 100,
150
and 200
MEz
k.
Recheckgain
calibration at
500
KHzas
outuned
in
Paragraph
5-20,
steps a
thru
h.
5-25.
PULSE
RESPONSE CALTBRATTON
(4624).
a.
Connect
theMod€l462,Aas
shoivninFiore
5-5.
b.
Set
attenuator
tD
50
db.
..
Set
462.4
GArN
(DB)
conrrot
ro
40 db.
d.
Set
up
the pulse
generator
for
a
30
nsec nega-
tive
pulse
at
a
repetition late
between
0.1
MHz
and
1MHz.
e.
Connect
the
oscilloscope
and
50
Q
load
toposi-
tion
B
and
set the
oscilloscope
to
displav
one 30 nsec
pulse.
Observe the
shape
of
the
inpui
putse.
0135s-2
f.
Adjust coils L2
thlu
LO
for optimm
pulse
re-
sponse:
rise
and
iall
time
<4 nsect overshoot
less
than
5%
(refe} to
r.igues
5-10 and 5-11).
Modei462A
Mode1462A
(anptilied
40
db)
Figue 5-10.
Input
and
Output Pulses
of
Model
462A
a6
photographed on
-hp-
1858
Samplirg
OsciUoscope;
Sweep Speed
is
4
ns/cm
5.26.
TICHED CIRCUIT AOARDS.
5-27. The Model 461.{ uses both ptated through
and
single
sided
etc hed
circuit
board
types.
Power
supply
assernbly
A2
uses the single
srded
etch€d-circuit
board.
The
ampluier
assembly
A3 uses the plated-
through type.
5-
28. When
replacing
a
component
on
the
plated-
through
type
of
eiched-ctcuit board, the
component
can
be
solderedfrom either
side
ofthe
board. Whenreplacing
a compoDent on
the
single
sided board,
the
component
sl'ould
be
soldered trom
rhe
conducror sidc.
Section
V
Pamgraphs
5-25
to
5-28
$
I
!
I
0""'^
o
!"@:
nI^
.
.-]
(o)
(o)
99
Figure
5-8.
Frequency
Response
Calibration
Setup
t-7
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