Firmware V 1.0 / © 2005-2013 by Aaronia AG, D-54597 Euscheid, www.aaronia.com
23
There are TWO ways to set the frequency range manually:
-
Center
(Center frequency) and
Span
(Frequency range width)
or
-
fLow
&
fHigh
(Start and stop frequency)
7.2 Center
(Center frequency)
Chooses the frequency displayed in the middle of the readout. When changing
the
Center frequency
, the
SPAN
parameter (see following description) is pre-
served. That way you can quickly evaluate different frequency ranges with
identical
SPAN
and without tedious re-adjustment of
Start/Stop frequencies
.
7.3 Span
(Frequency range width)
Span
adjusts the
width of the sweep
. Changes are relative to the before men-
tioned “
Center frequency
” of the display. By changing
Span
, the
Start/Stop fre-
quency
(see following description) is automatically adjusted to be able to con-
form to the
Span
. Therefore the
Span
function can be compared to a “magnify-
ing glass”, though only operating in the X axis.
EXAMPLE:
You have chosen 2
k
Hz as the
Center frequency
. Now choose
2
k
Hz as
Span
, and it will be sweeped from 1 to 3kHz. Choose 3
k
Hz as
Span
and the sweep will be performed from 0,5 to 3,5
k
Hz etc. In other words, you
always increase or decrease the resolution, centered around the
Center fre-
quency
.
HINT:
The right/left arrow keys can be used to move the sweep range directly
one
SPAN
unit to the right or left.
For best level-results you should choose the
Span
not bigger then 20 times the
RBW size (e.g. 1kHz RBW = maximum 20kHz
Span
).
SPAN
Center Frequency
7.0 The main menu
