Page 15
4.1.5 Frequency Presets
enables up to six frequency ranges to be quickly stored and recalled. Only the
centre and span (or equivalent start and stop frequencies) are stored. This differs
from a Trace State or Set-up file for which more parameters are stored (see sections
5.7.1 or 5.7.3 respectively). Frequency presets are retained when the instrument is off.
Creates a set of bottom-row function keys as follows:
sets the sweep to the full range of the instrument (1MHz to 2.7GHz or 1.3GHz).
brings up a menu of six preset numbers (1 to 6) into which the current value of the
sweep frequency range can be stored. Existing values are over-written.
brings up a menu of six preset numbers (1 to 6) which recall previously stored
frequency ranges. Empty positions are ignored.
switches between the current sweep frequency range and the last range to be
recalled from a preset (or from Full Span).
4.2 Sweep Time
The sweep time and update rate is automatically set from the Span and the RBW and is
displayed within the lower annotation area. There is no independent adjustment of sweep time.
Narrower RBW settings create longer sweep times. For each RBW, the sweep time in broadly
proportional to the frequency span. The approximate formula for calculating sweep update
times is given within the specifications
– see section 12.1.4.
4.3 Zero Span Mode
Zero span is a special case of frequency range setting. It is set from the Span sub-menu - see
section 4.1.2. Pressing Zero Span changes the trace display to be a horizontal line at the
centre frequency amplitude level, and brings up an alternative set of function keys as follows:
exits zero span mode and returns to a normal swept trace and the normal Span sub-
menu key functions.
brings up a menu which enables the demodulation mode to be set to AM or FM (or
Off) and the Audio Filter to be set to On or Off.
adjusts the demodulated audio volume (0 to15). The value shown on a
grey bar graph.
The demodulated audio is routed to a built-in loudspeaker. Alternatively, the audio can be
outputted via a 3.5mm jack socket - see section 3.1.3.
Freq
Presets
Full
Span
Recall
Preset
Toggle
Last
Exit
Z-Span
Demod
Volume
-
Volume
+
Store
Preset