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14
2.2.6.
Fn quency sweep
Th! frequency of
the
generator can be
controlled
by supplying
a
controi signal to input SWEEP IN. The
tre luency
changes
Iinearly with the controi voltage as a function
of
U
c
U
c
f
=
m (ns
+ - )
Hz, when 0< (n s
+ - ) <
10
o
V
V
-
=
signal
frequency at
the generator output
f o
m
=
factor set at
frequency-range
selector
(10- 3 , 10- 2
...
10 6 )
=
numerical value set
at the
linear
scale
(0.01
...
10)
n s
=
controi voltage at input SWE EP I N
U c
-
Any
range
up to three decades
out
of the overall frequency range of the instrument can be covered by
externai
sw
!eping
(see fig
.
4).
To avoid frequency- and phase jitter, which may be caused by extremely low inter
fer mce voltages
on
the
sweep
controi
signal,
it is recommended when
sweeping over
more than one decade
to
;et
the generator (according to 2.2.3.) to the lowest frequency desired and to
cover
the entire
sweep
range
by a controi signa/ of positive
polarity
.
·';-
".r.o\.-:-\-----
II
I~
:
J
"
'
.,,
~
t
t
,
"
\.10-1>...
...
I "~,,,
~~
Example
1:
Scale
set
to
4
r,
~
~//
.
,
Controi vo/tage on SWE EP I N
+3V
,
~~
Output frequency
(7
x range
m) Hz
-,
Example 2:
Scale
set
to
5
Controi vo/tage on SWE EP I N
rv
6 V pp
Sweep of the
output
frequency
(2
...
8x range m)Hz
Example 3:
Scale
set
to
2
Contral voltage on SWEEP /N
+
10 V
Output frequency
not defined
"
+-------. !
~
1
LIIlt'
.-
A
tc:A"L
PI"tUII'f
/otI.IfIItt;1t1C~1."'''
'
I
lNiI
COffr~
L
li'
tM,
r...,.,
Wcl
aASltVAlut
,
Of'
1'1' 0II1l'\11
'''t:OUENC
V
4ii
,
Q
-
Fig_
4
')weep range PM
5167.
-
-
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