Center
Frequency/Span
Operation
Center frequency/span is another way of establishing swept
operation. This is just a dierentway of dening sweep limits. As an
example of center frequency/span op eration:
Press
4
CENTER
54
4
54
GHz
5
.
Press
4
SPAN
54
1
54
GHz
5
.
The swept signal generator is nowsweeping from 3.5 to 4.5 GHz (to
view these gures, press either
4
START
5
or
4
STOP
5
, then
4
SPAN
5
). The
data display area indicates the center frequency as well as the span.
Notice that the green SWEEP LED is on.
While span is the active function, try the rotary knob and arrow
keys. This symmetrical increase or decrease of the frequency span
about the center frequency is one reason that center frequency/span
swept operation is used instead of start/stop frequency sweep.
Another example illustrates the subtleties of center frequency/span.
Press
4
CENTER
54
4
54
GHz
5
.
Press
4
SPAN
54
8
54
GHz
5
.
Notice that the center frequency changed. This is because the center
frequency could not accommo date a span of 8 GHz without exceeding
the lower frequency limit of the swept signal generator's sp ecied
frequency range. If the low or high frequency range limits are
exceeded, the
inactive
(center or span) function is reset. Exp erimen
t
with the rotary knob and the arrow k
eys as alternate metho ds of
data entry.
1-8 Getting Started Basic
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