Instructions

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C=M1 sets the centre frequency to the Marker 1 frequency.
C=Pk sets the centre frequency to the frequency of the peak amplitude
within the current span.
Step Up/Down changes the centre frequency by the step value as set by
the Step Size function from the Frequency/Span menu.
4.3.2 Frequency/Span > Span
Pressing Span changes the top line annotation to Centre/Span if it was previously
Start/Stop. The five keys on the bottom row enable the span of the sweep to be
changed:
Set Span brings up a numeric keyboard from which the desired span can be entered
in MHz to a resolution of 0.0001 (0.1kHz). Pressing Set by ‘Tab/Jog’ from this
screen provides an alternative frequency editing mode. Pressing ‘Set by K/B’ from
this screen returns to the numeric keyboard setting screen. Pressing ‘Exit’ returns to the main
Centre menu. The last used mode (K/B or Tab/Jog) is retained.
Set to Mdelta sets the span equal to the frequency difference between the M1 and
M2 markers (if they are both on).
Zoom Out/In increases or decreases the span from its current value in a
1:2:5 sequence.
Zero Span sets the span to zero and enables demodulation to be applied.
See Next Section.
4.3.3 Frequency/Span > Zero Span
Zero Span mode sets the span to zero and changes the swept display to a horizontal line at the
signal level. AM or FM demodulation can be applied to the signal.
Exit Z-Span cancels zero span mode and returns to the normal Span menu - see
Previous Page.
Audio Demod creates a new menu providing control of audio demodulation.
Waveform Demod creates a new menu providing control of the way that the
modulation waveform is displayed.
Audio Demodulation Sub Menu
Demod Type selects AM or FM demodulation.
Depth/Dev. enables the AM depth or FM deviation to be adjusted using Up/Down keys.
Audio Volume allows the volume applied to the internal speaker or headphone socket to be
adjusted in 15 steps, or muted.
A hiss reducing filter can be selected.
Waveform Demodulation Sub Menu
Display Type the demodulated signal for AM or FM can be displayed. The graticule represents
depth per division or deviation per division.
Alternatively the carrier can be displayed as a DC level, or as variation against a timebase.
Depth/Dev. enables the AM depth or FM deviation scaling to be set with Up/Down keys.
The range is 1.25%/div to 25%/div (AM) or 0.25kHz/div to 250kHz/div (FM).
Set
C=M1
Set
C=Pk
Step
Down
Step
Up
Span
Set
Span
Set to
Mdelta
Zoom
Out
Zoom
In
Zero
Span
Exit
Z-Span
Audio
Demod.
Wavefm
Demod.