RF
OUT
RF
Out
Model
8754A
8748A
@ ®
8640
(or
8660)
@ 0
Reference
Plane
Extension
~;;;;;;;;;;;;~;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;I~~
Sweep
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@
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8748A
R A B
8754A
8620C
RF
0-+10
IN
~lIiiiil
PROGRAMMING
PIN
28
..-.------~
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...
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PROGRAMMING
@
00
a 0
0000
0000
0000
PIN
4 a 0 0 0
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34
Wideband Sweep Using Source With FM Capability
For
the 8620C,
the
frequency sweep
is
obtained
by
connect-
ing the
8754A
0
to
10V sweep
output
(on J7 PROGRAM-
MING
connector
pin
4)
to
the
8620C external sweep
input
(PROGRAMMING
connector
pin 28). The ground connec-
tion should also be made between
8754A
J7
pin 18 and
8620C pin 43.
Set
8754A
SWEEP WIDTH MHz
to
EXT RF
Set
8754A
FREQUENCY MHz display
to
the
start
frequency
of
the
sweep.
Set
8640
FM
switch
to
OFF
and set center frequency using
8640
FREQUENCY TUNE and
FINE TUNE controls.
Set
8640
FM switch
to
DC,
set
8754A
SWEEP
to
MAN, adjust
the
8754A
sweep vernier fully
counterclockwise, use
the
8640
PEAK DEVIATION control
to
set
the
start frequency (as
. read
on
a counter). Then select
8754A
AUTO and FAST
or
SLOW
sweep.
For
sweeps greater
than
one and one-half octaves, a sweeper
such
as
the
HP 8620C may be used.
Calibrate and make measurements as discussed previously.
Using an External Source
Narrowband Sweep Using Source With FM Capabilities
Make a measurement using
the
8640A
or
8640B
as
follows:
For
sweeps less
than
one and one-half octaves, any any source with dc-coupled
FM
input, such
as
the
8640
or
8660
may be used.
For
the
8660
and
8640
sources
the
frequency sweep
is
ob-
tained
by
connecting
the
8754A
rear panel SWEEP OUT-
PUT
to
the signal generator
FM
INPUT. The
8754A
Sweep
output
is
a
-5V
to
+5V ramp used
to
frequency modulate
the
signal generator
RF
output
at
a rate selected
by
the
8754A
SWEEP control. Center frequency peak deviation
(1/2
sweep width),
and
RF
output
level are set using
the
stabilized source controls.
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