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8 Audio spectrum menu
· [Span]: Press [Audio Spectrum]→ [Span], and set the span of the
audio spectrum. The span should be large enough to display the
audio signal and related harmonics. You can change the span with
the number keys and select the frequency unit, or with the [↑] or [↓]
key or knob.
· [Scale/Division]: Press [Audio Spectrum]→ [Scale/Div], and set
the scale of the audio spectrum, so as to facilitate the observation of
the audio spectrum trace. You can change the scale unit with the
number keys and select the power unit [dB] or [-dB], or use the [↑]
or [↓] key or knob.
· [Reference position]: Press [Audio Spectrum]→ [Ref Position],
and set the reference position of the audio spectrum to facilitate the
observation of the audio spectrum line. You can change the
reference position with the number keys and click [OK], or with the
[↑] or [↓] key or knob.
9 Audio waveform menu
· [Sweep time]: Press [Audio Waveform]→ [Sweep Time] and set
the audio waveform sweeping time. The longer the sweep time is
and the more points are sampled, the stabler the measurement
results will be.
· [Scale/Division]: Press [Audio Waveform]→ [Scale/Div] and set
the scale of the audio waveform to facilitate the observation of the
audio spectrum trace. You can change the scale unit with the
number keys and select [%] or click [OK], or with the [↑] or [↓] key
or knob.
· [Special note]: The scale unit changes with the type of the
modulation signal. The scale unit should be percentage (%) in
AM signal measurement, frequency unit (Hz, kHz or GHz) in
FM signal measurement and radian (Rad) in PM signal