Instructions

Page 17
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
9.2.3 or 9.2.5 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 (10MHz to 3.6GHz or 6.0GHz).
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).
4.1.6 Sweep Time
The normal sweep time and update rate is automatically set from the Span and the RBW and is
displayed within the lower annotation area. Narrower RBW settings create longer sweep times.
For each RBW, the normal sweep time is broadly proportional to the frequency span. The
sweep time can be manually reduced at the expense of amplitude accuracy. See section 4.3.2.
4.2 Zero Span Mode (Demodulation 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 removes the normal sweep display and enables audio and
waveform demodulation of AM and FM signals.
Pressing Zero Span brings up an alternative set of function keys as follows:
creates sub-menu from which audio demodulation of AM and FM signals can be
controlled. See section 4.2.1.
only available if option U02 is installed. Creates a sub-menu from which the
modulation waveform can be displayed and controlled. See section 4.2.2.
exits zero span mode and returns to a normal swept trace and the normal Span sub-
menu key functions.
4.2.1 Audio Demodulation Sub Menu
The demodulated audio is routed to a built-in loudspeaker. Alternatively, the audio can be
outputted via a 3.5mm jack socket - see section 2.1.3.
selects the type of demodulation as AM or FM. Note that this selection is also
applied to Waveform Demodulation.
enables the AM depth or FM deviation to be adjusted using Up/Down keys.
The range is 1.25%/div to 25%/div equivalent to +/-5% to +/-100% full scale (AM) or
0.25kHz/div to 250kHz/div equivalent to +/-1kHz to +/-1MHz full scale (FM).
Note that this selection is also applied to Waveform Demodulation
Freq
Presets
Full
Span
Recall
Preset
Toggle
Last
Audio
Demod
Wavefm
Demod
Store
Preset
Exit
Z-Span
Demod
Type
Depth/
Dev.