Model
8642A/R
Descrip tion
Operation
RF
FREQUENCY
SWEEP
Two
types
of
frequency
sweep
are
available.
Stepped
Frequency
Sweep sweeps
from
a
start
end-point
to
a
stop
end-point
in
linearly
spaced,
incremental
steps. Phase
Continuous
Frequency
Sweep (Special FUllction 123) sweeps
from
a
start
end-point
to
a
stop
end-point
in a
linear,
phase
continuous
manner.
Sweep
step
size is
automatically
selected
based
on
the
frequency
span
(which
is
the
absolute
value
of
the
start
frequency
minus
the
stop
frequency)
and
the
sweep time.
Although
step
size
for
the
Stepped
Frequency
Sweep
cannot
be
directly
set,
this
operating
illstruction
provides ways to
calculate
a
<;weep
t!1I1e
ILl
enable
you
to
select a
particular
step
size
or
number
of
steps
Table
3-12.
RF
Frequency
Sweep
Operating
Characteristics
Electrical
Characteristics
Performance
Limits
Conditions
Digitally Stepped
Frequency Sweep
Range
0.100000 to 1057.500000
MHz'
8642A
0.100000 to 2115.000000
MHz'
86428
Time
275 ms minimum
999s maximum
Phase Continuous
End-points can be outside the
Frequency Sweep
band but (Start Frequency
+
Stop Frequency)
;-
2 must be
within the band.
Maxirnurn Sweep Span
BOO.OOO
kHz (B6428 only) 1057.500001 to 2115.000000 MHz
400.000 kHz 528.750001 to 1057.500000 MHz
200.000 kHz
264.375001 to 528.750000
MHz
100.000 kHz 132.187501 to 264.375000
MHz
50.000
kHz2
66.093751 to 132.187500 MHz
25.000
kHz2
33.046876 to 66.093750 MHz
12.500
kH
z
2
16.523438 to 33.046875 MHz
6.250
kHz2
8.261719 to 16.523437
MHz
3.125
kHz2
4.130860 to 8.261718 MHz
25.000
kHz2
0.100000 to 4.130859 MHz
400.000 kHz
0.100000 to 132.187500
MHz~
Time 5 ms rninimum
999s rnaximum
Maximum and minirnum sweep
tirnes are also dependent on
the sweep span and carrier
frequency.
X Axis Output
o to 10 Vdc
±10%
Z Axis Output
TTL
Positive True For crt display blanking
during retrace
4
t----
'In
AUTO
sweep
mode. it is not possible
to
set start and
stop
end-points if one end-point is less than 4.130860 MHz (band
2)
with a second
end-point
greater than
,32187500
MHz
(band
6).
Also, it is not possible
to
set a
sweep
across 1057.500000 MHz
(8642B only)
2
Maximum
end-point separation may be increased up to that
shown
for the HET band by selecting a frequency span larger
than the span
shown
here. HET band can also be selected with Special Function 8
3The
HET Band
4 Buffer this output in order
to
use the Z-axis output with a plotter for pen lift
3-49
To Next Page
Loading...
Need help?
General
