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Paraeraph
5-
24
5-24.
FREQUENCY
RESPONSE
CALTBRATION (461A).
a-
This caliblattonplocedure
can
alsobeus€d
for
a
pedormance check
procedure.
The
Telonic
Model
SM-2000
provides
a
Unea!
swe€p
from
1
KHz
to
200
MHz.
The
firsi
External Monitor
fe€ds
a
dc
back
to
the
sa'eep
genentor to stabilize the
sw€ep
output.
tt
alsoleeds
a
reference level
to the
oscitloscope.
The
second
Exterial
Monitor genentes
a
dc ouipui pro-
portional
to
the RE
output
of the 461A. The
sweep
drive from
the
sweep
generator
is
usedas
a
horizontat
input
to
the
scope.
b.
Conn€ct
tle
Model
461A as
shov,/n
in
Figure
5-
8.
Keep
the lead length
as short
as possibte.
c.
Set
the
sveep
generatorfor
a
0-200 MHz
sweep
with
50
MHz
markers:
STWEEP
..
.......100Mc
MARKER..
5OMC
d.
Set
the oscilloscope to
operate
oD
an
external
sweep,
3nd adju6r
verlical seniiliviry
ro
0.01 v .m
(dc
coupled). Adjusl
rhc
horizonratsensilir:ry
so
rhar
the
display covers the
screen.
e.
Rotate Model 461A GAIN
control to
40 db.
f.
Set
Oscilloscope VERTICAL
PRESENTATION
to
channel B; adjust SENSITI'ITY VERMER
for
10
g.
Set Oscilloscope VERTICAL
PRESENTATION
toB-A;adjust
VERTICAL
POSITION
Btocentertrace.
h.
Frequency response
shoutd
r,?ry less
than
+1
db
Irom
babe
lrne over frequen.y
ranse
ot l0
ro
150
MItz.
1db
!
10%.
j.
Adjust
coils L2 thlu
L6
for
optimum flatness
fron
1 KHz
to
150MEz. (Refer to r,isure
b_9.)
Models 461A/462A
I
I
I
d
MONITOR
5-6
0db
S'
EEP
EXT
RF
ATTENUATORS
NOTFT
\a,
It
may
also
b€
necessary to
adjust
the
overall
gain
by
changing the
ralue oI
R18
and
R29
to
achi€ve
opiimum
flat-
ness
with
40 db
of gain.
RF
EUNC
TION
J'>
a
a
Flglrre
5-7.
Panet
Removal
and Rpptacemenl
01358-2
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