SAF 0.3-3 GHz Spectrum Compact, Руководство пользователя

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0.3-3 GHz SPECTRUM COMPACT (FW V5.2.6) OPERATION
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2.4 SPAN
The SPAN menu allows selecting the range of the horizontal axis (difference
between START and STOP frequencies) i.e. span, in megahertz (MHz).
While at the SPAN menu, tapping the right part of the graph decreases SPAN
(zooms in) and tapping the left part of the graph increases SPAN (zooms out).
Sliding the graph to the right or to the left modifies START and STOP
frequencies by equal amounts, keeping the SPAN constant.
Modifying SPAN preserves CENTER frequency, if possible, but alters START and
STOP frequencies. Tapping the MIN SPAN or FULL SPAN button instantly sets SPAN
to respectively minimum or maximum allowed value. If the current SPAN value is the
actual minimum or maximum, the corresponding button will be
green . FULL SPAN is
enabled by default.
The AUTO function at the RBW & VBW menu automatically adjusts resolution
and video bandwidths depending on the selected SPAN. AUTO ensures
optimum use of the filters. AUTO is enabled by default.
The minimum allowed SPAN differs for each of the resolution bandwidths – 0.5
MHz for 10 kHz RBW, 1.5 MHz for 30 kHz RBW, 5 MHz for 100 kHz RBW and 15
MHz for 300 kHz RBW.
FULL SPAN is the full supported frequency range of 2700 MHz, but there is a
maximum SPAN limitation for the MIN/MAXHOLD trace mode – 200 MHz for
10 kHz RBW and 900 MHz for 30 kHz RBW (see
TRACE ).
The current SPAN is displayed in white. The color of keypad buttons shows which
numbers can be entered at the current digit position to obtain a valid parameter value
– the numbers on the
green buttons can be entered, the numbers on the red buttons
cannot be entered. If the currently entered value is valid, it is displayed in green (also
OK button is green ). If the value is not valid, it is displayed in red (also OK button is
red ). To confirm a valid value, tap the OK button or tap the parameter’s box.
The frequency value can be entered with precision 0.01 MHz (10 kHz) by using the
“.” on keypad. To input a value with decimal digits, first enter the full MHz’s, then tap
the “.” button and enter the rest of the digits. Until the value is confirmed, the digits
after the point are displayed larger. If there are no digits displayed after the point, it
means that they are zeroes.
To exit the SPAN menu and return to the main screen, tap BACK.